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    公开号:BR112013015405B1
    申请号:R112013015405
    申请日:2011-12-05
    公开日:2018-09-11
    发明作者:Sällström Jan；David Jeffs Paul
    申请人:Foseco Int；
    IPC主号:
    专利说明:

    (54) Title: FEEDING ELEMENT, AND, FEEDING SYSTEM FOR METAL FOUNDRY (51) Int.CI .: B22C 9/08 (30) Unionist Priority: 17/02/2011 EP 11250182.0 (73) Holder (s) : FOSECO INTERNATIONAL LIMITED (72) Inventor (s): PAUL DAVID JEFFS; JAN SÃLLSTRÕM (85) Date of Beginning of the National Phase: 06/18/2013 “FEEDING ELEMENT, AND, FEEDING SYSTEM FOR METAL FOUNDRY”
    Field of the Invention
    The present invention relates to a feed element for use in metal casting operations using casting molds, especially, but not exclusively, in vertically divided high pressure sand molding systems.
    Fundamentals of the Invention
    In a typical casting process, molten metal is cast into a preformed mold cavity that defines the shape of the casting. However, as the metal solidifies, it contracts, resulting in contraction cavities which, in turn, result in unacceptable imperfections in the final cast. This is a well-known problem in the foundry industry and is addressed by the use of clusters or feeders that are integrated into the mold during mold formation. Each massalote provides an additional volume or cavity (normally closed) that communicates with the mold cavity, so that molten metal also enters the massalote. During solidification, molten metal inside the massalote flows back into the mold cavity to compensate for the melt's contraction. It is important that the metal in the cavity of the massalote remains molten for longer than the metal in the mold cavity, and thus massalotes are made to be highly insulating or more normally exothermic, so that, upon contact with the molten metal, heat additional amount is generated to delay solidification.
    After solidification and removal of material from the mold, unwanted residual metal within the cavity of the massalote remains attached to the melt and must be removed. In order to facilitate the removal of the residual metal, the massalot cavity can be tapered towards its base (that is, the end of the massalot that will be closest to the mold cavity)
    Petition 870180060827, of 7/13/2018, p. 7/53 in a design normally referred to as a strangled massalote. When a sharp blow is applied to the residual metal, it separates at the weakest point, which will be close to the surface of the melt (the process commonly known as “core removal”). A small footprint of the casting is also desirable to allow the positioning of the masses in areas of the casting where access can be restricted by adjacent resources.
    Although massalotes can be applied directly to the surface of the mold cavity, they are often used in conjunction with a brittle core. A brittle male is simply a disc of refractory material (typically, a sanded male with resin or a ceramic male or a male of massalote material) with a hole in its center that sits between the mold cavity and the massalot. The diameter of the hole through the brittle core is designed to be less than the diameter of the internal cavity of the massalote (which does not necessarily have to be tapered) so that the core will be removed from the brittle core near the surface of the casting.
    Brittle cores can also be made of metal. DE 196 42 838 A1 discloses a modified feeding system in which the traditional ceramic brittle is replaced by a rigid flat annular crown and DE 201 12 425 U1 reveals a modified feeding system using a rigid “hat-shaped” annular crown.
    Foundry molds are usually formed using a molding pattern that defines the mold cavity. Pins are provided on the pattern plate at predetermined locations as mounting points for the bulkheads. Once the required massalotes are mounted on the standard plate, the mold is formed by pouring molding sand on the standard plate and around the massalotes until the massalotes are covered and the mold box is filled. The mold must be strong enough to resist erosion
    Petition 870180060827, of 7/13/2018, p. 8/53 during the casting of molten metal, to withstand the ferrostatic pressure exerted on the mold when filled and resist expansion / compression forces when the metal solidifies.
    Molding sand can be classified into two main categories: chemically bonded (based on both organic and inorganic binders) or bonded with clay. Chemically bonded molding binders are typically self-hardening systems, where a binder and chemical hardener are mixed with the sand and the binder and hardener begin to react immediately, but slowly enough to allow the sand to be shaped around the standard plate and then allowed to harden enough for removal and casting.
    Clay-bound molding sand uses clay and water as the binder and can be used in the “green” or non-dry state and is commonly referred to as green sand. Green sand mixtures do not flow readily or move easily under compressive forces alone and, therefore, to compact the green sand around the pattern and give the mold sufficient strength properties, as previously detailed, a variety of bump, vibration, compression and repression is applied to produce molds of uniform strength, usually with high productivity. The sand is typically compressed (compacted) at high pressure, usually using a hydraulic pressurizer (the process being referred to as "repression"). With increasing requirements for casting complexity and productivity, there is a need for more dimensionally stable molds and the tendency is towards higher pressure pressures that can result in the breaking of the massalot and / or brittle core, when present, especially if the brittle core or the massalote is in direct contact with the standard plate before repression.
    The referred problem is partially mitigated by the use of
    Petition 870180060827, of 07/13/2018, p. 9/53 spring pins. The massalote and optional locator male (typically comprised of high density massalote material, with general dimensions similar to the brittle males) are initially spaced from the standard plate and move towards the standard plate by repression. The spring pin and massalote can be designed in such a way that, after repression, the final position of the massalote is such that it does not come into direct contact with the standard plate and can typically be 5 to 25 mm away from the surface of the standard . The point of removal of the tap is often unpredictable, as it is dependent on the dimensions and profile of the spring pin base and therefore can result in additional cleaning costs. The solution offered in EP-A-1184104 is a two-part massalot. By means of compression during mold formation, one part of the mold (massalote) pushes into the other. One part of the mold (massalote) is always in contact with the standard plate and there is no requirement for a spring pin.
    However, there are problems associated with the telescopic arrangement of EP-A1184104. For example, because of the telescopic action, the volume of the massalot after molding is variable and dependent on a range of factors including molding machine pressure, casting geometry and sand properties. This unpredictability can have a detrimental effect on feeding performance. In addition, the arrangement is not ideally suited where exothermic massages are required. When exothermic lumps are used, direct contact of the exothermic material with the melt surface is undesirable and can result in poor surface finish, local contamination of the melt surface and even gas defects in the subsurface.
    Also, an additional disadvantage of the telescopic arrangement of EP-A-1184104 arises from flaps or flanges that are necessary to maintain the initial spacing of the two parts of the mold (bulkhead). During molding, these small flaps break (thereby allowing
    Petition 870180060827, of 7/13/2018, p. 10/53 the telescopic action) and simply fall into the molding sand. Over a period of time, these parts will accumulate in the molding sand. The problem is particularly critical when the parts are made of exothermic material. Sand moisture can potentially react with exothermic material (eg metallic aluminum), creating the potential for small explosive defects.
    Publication WO2005 / 051568 (the full disclosure of which is incorporated herein by reference) discloses a feed element (a collapsible brittle male) which is especially suitable in high pressure sand molding systems. The feed element has a first end for mounting in a mold pattern, a second opposite end for receiving the massalot and a hole between the first and second ends defined by a stepped sidewall. The stepped sidewall is designed to deform irreversibly under a predetermined load (resistance to crushing). The feed element offers numerous advantages over traditional brittle males, including:
    (i) a smaller contact area of the feed element (opening for the casting);
    (ii) a small footprint (contact of the external profile) on the surface of the casting;
    (iii) low probability of breaking the massalote under high pressures during mold formation; and (iv) removal of the tap consistent with significantly lower cleaning requirements.
    The feeding element of WO2005 / 051568 is exemplified in a high pressure sand molding system. The high settlement pressures involved require the use of high-strength (and high-cost) massalo packs. This high resistance is achieved by a
    Petition 870180060827, of 7/13/2018, p. 11/53 combination of the massalote design (ie, shape, thickness, etc.) and the material (ie refractory materials, type and addition of binder, manufacturing process, etc.). The examples demonstrate the use of the feed element with a FEEDEX HD-VS159 massalote, which is designed to be pressure resistant (ie high strength) and for point feeding (ie high density, highly exothermic, thick walled and thus high modulus). The massalot is attached to the feed element by means of a mounting surface that supports the massalot's weight and which is perpendicular to the axis of the hole. For medium pressure molding, there is a potential opportunity to use less resistant massalootes, that is, different designs (shapes and wall thicknesses, etc.) and / or different composition (that is, less resistance). Regardless of the design and composition of the massalote in use, there would still be problems associated with removing the core from the casting (variability and size of the casting footprint) and the need for good sand compaction under the feed element. If the feed element of WO2005 / 051568 is to be used in medium pressure molding lines, it would be necessary to design the element so that it collapses sufficiently at the lowest molding pressure (compared to high pressure molding) that is, that it has less resistance to initial crushing. It would also be highly advantageous to use less resistant massalotes (typically lower density massalotes). In addition to the elimination of the cost penalty (associated with having to use high-density, high-strength massalot), this would allow the use of massalot better suited to the individual application (casting) in terms of volume and thermophysical properties. However, when this was first attempted, it was surprisingly found that the massalote showed damage and breaks in the molding which, if used for casting, would have caused the cast to be defective.
    An improved power element was therefore
    Petition 870180060827, of 07/13/2018, p. 12/53 conceived and described in publication WO2007 / 141466 (whose content in its entirety is also incorporated by reference) to the extent that the usefulness of collapsible feeding elements in medium pressure molding systems, still allowing the use of relatively large clumps weak without introducing casting defects. This feeding element is similar to the one described above with respect to WO2005 / 051568, but additionally includes a first side wall region defining the second end of the element and a mounting surface for a massalot in use, the first side wall region being inclined with the hole axis at less than 90 o , and a second side wall region contiguous with the first side wall region, the second side wall region being parallel or angled with the hole axis at an angle different from the first wall region side, by means of which a stop on the side wall is defined. As for the power element described in the publication
    WO2005 / 051568, it was similarly observed that an arrangement like this was advantageous in minimizing the footprint and contact area of the feed element, thereby reducing the variability associated with removing the core from the casting.
    To satisfy productivity requirements, automatic green sand molding lines have become increasingly popular for the large-scale manufacture of smaller castings, for example, automotive components. Horizontally automatic split molding lines using a matching plate (standard plate with patterns for both cover and drag mounted on opposite sides) are capable of producing molds at up to 100-150 per hour. Vertically divided molding machines (such as Disamatic boxless molding machines manufactured by DISA Industries S / A) are capable of much higher speeds of up to 450-500 molds per hour. On the Disamatic machine, a standard medium is mounted on the end of a compressed piston operated
    Petition 870180060827, of 7/13/2018, p. 13/53 hydraulically with the other half mounted on an oscillating plate, so named because of its ability to move and oscillate out of the mold. Vertically divided molding machines are capable of producing hard sandless green sand molds that are particularly suitable for ductile iron castings. In such applications, sand is typically blown at a pressure of 2 to 4 bar and then compacted at a clamping pressure of 10 to 12 kPa, with a maximum of 15 kPa being used in certain high demand applications.
    Horizontally produced castings offer greater flexibility in terms of ease of manufacture and there are numerous application techniques available, with potential access to the entire pattern area, allowing feeders to be placed as and where required. Vertically produced castings present greater challenges in ensuring that they are consistently solid, and feeding is typically restricted to top or side feeders placed on the molding seam, which makes feeding heavier isolated sections very difficult.
    There are essentially two types of feed requirements for any cast part, including those produced in vertically divided molds.
    The first power requirement is driven by the module, whereby the module is a substitute for the solidification time of the casting or section of the casting to be fed. For this, the metal of the feeder has to be liquid for a sufficient time, that is, greater than that of the casting and / or section of the casting, to allow the casting to solidify consistently without porosity and thus produces a casting without solid defect. For these applications, it is possible to use a standard round profile massalot (with a feeding element such as those shown in WO2005 / 051568 and WO2007 / 141466). In
    Petition 870180060827, of 7/13/2018, p. 14/53 In particular, for vertically divided high pressure molding lines, compressible feed elements are needed to provide the necessary sand compaction between the base of the feed element and the pattern surface, and it has been observed that the compressible feed elements such as those described in publications WO2005 / 051568 and WO2007 / 141466 are suitable for giving the necessary sand compaction along with consistently good feeder removal (small footprint and easy removal of the core).
    The second supply requirement is volume driven, that is, there is a need to supply a certain volume of liquid metal in the foundry. The volume is determined by several factors, basically the weight of the casting and the contraction of liquid and solid metal from the particular metal alloy. Another factor is the ferrostatic pressure (effective height of the liquid metal feeder above the neck or contact with the casting) which is particularly important for castings produced in vertically divided molds.
    It is the volume requirement and the dimensional restrictions in vertically divided casting molds that the present invention basically concerns.
    Summary of the Invention
    In order to supply a particular volume of liquid metal to a melt, it is desirable for the massalot to include a cavity for a sufficient volume of liquid metal above the hole in the feeder neck that leads to the melt to provide a metal reservoir and with sufficient ferrostatic pressure to feed the casting. Because of space restrictions and performance requirements, it is not practical to simply use a feeder with a larger standard shape (ie, circular or symmetrical cross section). For the reasons mentioned above, it is also desirable to use compressible power elements for use on machines
    Petition 870180060827, of 7/13/2018, p. 15/53 high pressure molding vertically divided to ensure good compaction of sand between the massalote and the standard and good removal of the massalote.
    The first attempts to address this requirement involved the use of massagers with a body enclosing a large cavity extending inside the frustoconic or lower cylindrical choke that was equipped with a circular compressible feed element such as those described in publications WO2005 / 051568 and WO2007 / 141466. The massalot body itself was circular, with a flat closed top, however, it was difficult to retain the massalot position on the oscillating plate (standard) during the normal movements of the oscillating plate in the mold manufacturing cycle. This was attenuated by introducing internal ribs or fins on the inner walls of the feeder and / or strangulation of the feeder, so that it was in contact with the location pin of the support used to keep the massalote in the mold pattern before the massalot was compressed into the mold. An alternative approach was to use a pin with a spring loaded mechanism such as a metal ball or wire bearing at the base of the pin, such that it is in contact with the feed element and holds it in position during molding.
    During molding, the collapsible feeding element gave the required sand compaction and the massalote was kept in the required position. However, upon casting, there was insufficient feeding of the casting, causing contraction defects to form in the casting. In an attempt to mitigate this by increasing the ferrostatic pressure, the base of the massalote was angled, such that when the pattern was in its molding position (vertically divided), the upper end of the massalote was positioned above the horizontal plane of the throttling the feeder at an angle of up to 10 degrees. This improved feed performance by increasing the ferrostatic pressure, but not enough to
    Petition 870180060827, of 7/13/2018, p. 16/53 produce a defective casting. It was not possible to increase this additionally by increasing the angle because of the difficulty of producing a suitable slot in the massalot for the support pin, and removal of the pin after molding without damaging the massalot.
    An alternative approach tried was to test elongated vertically or oval-shaped massalotes with different feeding elements. To assist in the vertical alignment of the massalote and prevent rotation of the massalot in the mold pattern before the massalot is compressed into the mold, specially configured support pins were used. The pins were configured for insertion through the feed element hole and the end of the pin was profiled, for example, a flat blade or fin, in such a way that it matched the massalote / feed element only in one orientation and thus prevented rotation of the massalote on the pin. Although this overcame the orientation problem, it was observed that, by compressing the sand mold, the massalote tended to crack. When a non-compressible strangled feed element comprised of a brittle resin-bonded sand core was used, there was insufficient compaction of the molding sand between the base of the feed element under the massalot and adjacent to the standard plate, and the high molding pressures led to cracking and breaking of the feed element. Similarly, if a circular compressible feed element such as those described in publications WO2005 / 051568 and WO2007 / 141466 was used in conjunction with a second strangled feed element connected with elongated resin and a massalote (ie, a three component system) fractures and breaks in the strangulation component were observed.
    Therefore, it is an object of the present invention to provide a feed element and feed system that can be used in a casting molding operation using a casting machine.
    Petition 870180060827, of 7/13/2018, p. 17/53 automatic or semi-automatic molding vertically divided from molding under pressure.
    According to a first aspect of the present invention, a feed element for use in metal casting is provided, said feed element comprising:
    a first end for mounting on a mold pattern or oscillating plate;
    a second opposite end comprising a mounting plate for mounting in a bulkhead; and a hole between the first and second ends defined by a side wall;
    said feeding element being compressible in use to thereby reduce the distance between the first and second ends;
    wherein the hole has an axis which is displaced from the center of said mounting plate and where an integrally formed edge extends on said mounting plate.
    Modalities of the present aspect of the invention can, therefore, provide an asymmetric feed element that is suitable for use in high pressure vertically split molding machines (such as those manufactured by DISA Industries A / S). As previously described, it may be advantageous to use asymmetrical lugs in such a way that, in use, there is a greater height above the hole axis. This allows for a greater volume of metal and ferrostatic pressure (column) above the bore axis and the feed throttle to ensure a greater and more efficient flow of molten metal into a mold cavity. The claimants therefore decided to test open clusters on the sides (instead of providing a lower choke portion) in such a way that the feed element was provided on a mounting plate arranged to
    Petition 870180060827, of 7/13/2018, p. 18/53 support on the edge of the open side of the massalote. Thus, feed elements such as those described in publications WO2005 / 051568 and WO2007 / 141466 have simply been provided with elongated mounting plates for use in elongated bulkheads. However, it was discovered that when high mold pressure was applied to these components, the compressible part of the feed element collapsed, as required, however, the forces absorbed and transmitted through the collapsible part and to the molding plate caused the portion the feed element in contact with the massalote unexpectedly warps and folds out of the massalote. This was not satisfactory due to being able to let molten metal escape through parts of the massalote other than the hole, which, in turn, could affect the casting quality and efficiency. Therefore, it was desirable to design a feed element that included a collapsible portion to collapse under high pressure, as well as a generally flat mounting portion that would remain rigid and would not distort, even when high mold pressure was applied asymmetrically.
    It was observed that the portion of the side wall closest to the center of the plate tended to collapse inwards more than the rest of the side wall, the initial work concentrated on strengthening this area. However, it was surprisingly observed that the inclusion of an additional arc-shaped metal reinforcement rib in the central region of the mounting plate or the welding of an additional metal part to increase the thickness of the plate in this region did not completely prevent the plate gable. While it may be possible to prevent deformation by manufacturing the entire thicker metal feed element, this would also prevent the hole from collapsing under pressure and thus would not provide a practical solution. An alternative solution considered, therefore, involved the preparation of a two-part unit where the compressible portion is attached to a thicker, more rigid plate. However, this solution was considered
    Petition 870180060827, of 7/13/2018, p. 19/53 impractical and prohibitively expensive, since machines that are designed for large-scale production and a lower cost casting production required consumable parts, as well as that the power elements were low-cost in order to be commercially viable .
    After further work towards a practical solution, it was surprisingly observed that the inclusion of a rim (which could be formed by incorporating a fold) along the peripheral edge of the mounting plate appeared to reinforce the plate to prevent warping during compression.
    As each of the feed elements of the prior art was designed for bulldogs with a symmetrical choke (which is circular in cross section), none of them addressed the problem that the present invention aims to solve. Thus, while some of the prior art power elements include walls in their mounting plates, none have included a displaced hole and a rim to provide a reinforcement or strut function as the hole is compressed. Instead, the prior art has focused on feeding systems where massalotes have circular walls around central holes, such as those described in publications WO2007 / 141466 and DE 201 12 425 U1. In
    WO2007 / 141466, the feeding element is collapsible and, in use, the circular wall that acts as an angled mounting surface for the massalote reduces the pressure on the massalote and thereby reduces massalote breaks. In the patent document DE 201 12 425 U1, the feeding element is rigid and does not deform in use and, in certain embodiments, the mounting surface has a pair of spaced circular walls (edges) in such a way that, through molding, the internal ferrule ensures that any broken part of the massalote wall is retained in position and does not fall into the mold (and cast).
    The rim can be formed by incorporating a curve, bend, twist
    Petition 870180060827, of 7/13/2018, p. 20/53 or corrugation on the mounting plate.
    The mounting plate can be substantially flat and can be circular or non-circular. In particular, the mounting plate can be elongated and / or asymmetrical, for example, with a greater vertical dimension than horizontal (as oriented, in use), thereby defining a pair of longitudinal peripheral edges. In specific embodiments, the mounting plate can be substantially oval, elliptical, square, rectangular, polygonal or in the shape of a flattened cylinder (that is, with two parallel straight sides and two ends as part of a circle).
    In the case of an elongated plate, the rim may extend at least partially along the peripheral edges (i.e., length) of the plate.
    When the mounting plate is substantially circular (or where it has at least 2 axes of symmetry), there will be no larger dimension. In such cases, the length of the plate (and, consequently, the larger peripheral edges) will be arbitrarily defined with reference to the dimension corresponding to a line that passes through the center of the mounting plate and the center of the hole, perpendicular to the axis of the hole (in practice , this will be the vertical dimension in use). In such cases, at least part of the rim may extend in a substantially direction along the arbitrarily defined peripheral "longitudinal" edges of the plate.
    For practical reasons, the hole is preferably located substantially centrally with respect to the nominal width of the mounting plate (the nominal width being the dimension orthogonal to the length).
    It is believed that the force applied to the feed element is greater in the vicinity of the hole than in the rest of the assembly flame and, as a result, a bending moment is generated, impelling the assembly plate to bend around an axis that is in the plane of the mounting plate and is substantially perpendicular to the length of the
    Petition 870180060827, of 7/13/2018, p. 21/53 plate. The inclusion of a rim extending along the longitudinal peripheral edges of the plate (and orthogonal to said axis of the bending moment), therefore, increases the rigidity of the mounting plate and provides resistance to the bending moment.
    It is understood that, in certain modalities, the ring may extend continuously around the plate in order to form a skirt. In other modalities, the rim may be discontinuous, that is, in the form of a series of spaced ears (which may be of equal or different lengths), or even a single ear. In a particular embodiment, the rim is in the form of a pair of ears, each extending along a respective longitudinal peripheral edge.
    Where the rim is discontinuous, its length (or the length of each ear that makes up the rim) is not particularly limited, as long as it is sufficient to prevent the mounting plate from buckling when in use.
    In certain embodiments, the rim (continuous or discontinuous) extends along each peripheral longitudinal edge at least from one point in a line defined by the tangent to the edge of the hole closest to the center of the plate to a point in a line in the direction of the nominal plate width that passes through the center of the plate.
    In other embodiments, the rim (continuous or discontinuous) extends along each peripheral edge at least from one point in a line in the direction of the nominal width of the plate that passes through the axis of the hole to a point in a line in the direction of the width plate that passes through the center of the plate.
    The rim can be perpendicular to the mounting plate or angled with respect to the mounting plate. In the case of a discontinuous ring consisting of a plurality of ears, each ear can be similarly or differently angled with respect to the mounting plate.
    Petition 870180060827, of 7/13/2018, p. 22/53
    In certain embodiments, the mounting plate can be substantially flat and the rim can be tilted out of the first end of the feed element at an angle of 10 ° to 160 ° with respect to the plane of the mounting plate. In other embodiments, the rim can be tilted out of the first end at an angle, for example, 20 ° to 130 °, 30 ° to 120 °, 40 ° to 110 °, 50 ° to 100 ° or 60 ° to 95 °. It is understood that, at angles greater than 90 °, the flange will bend under the mounting plate, the angle being measured outside the plane of the mounting plate. At angles up to 90 °, the rim will generally extend out of the mounting plate.
    An advantage of having the rim tilted at a substantially 90 ° angle with the mounting plate is that the rim can in turn assist in aligning the feed element in a massalot with an outer surface matched at 90 ° to the plate. Assembly.
    The depth of the rim is not particularly limited, but in certain embodiments, it can be at least 5 mm or at least 10 mm.
    The side wall defining the hole may comprise at least one stop. In particular embodiments, at least two stops or at least three stops can be provided.
    Each stop can be substantially circular, oval, elliptical, square, rectangular, polygonal or in the shape of a flattened cylinder. Each stop can be the same (or different) as the other stops.
    Each stop may be formed by a first side wall region and a second side wall region contiguous with the first side wall region, but in which the second side wall region is provided at a different angle with respect to the hole axis. , of the first lateral wall region.
    The first side wall region can be parallel to the hole axis, or can be tilted with the hole axis by less than 90 °. THE
    Petition 870180060827, of 7/13/2018, p. 23/53 second side wall region can be perpendicular to the hole axis or tilted with the hole axis by less than 90 °.
    It is understood that the amount of compression and the force required to induce compression will be influenced by numerous factors, including the material of manufacture of the feed element and the shape and thickness of the side wall. It is also understood that individual feed elements will be designed according to the intended application, the expected pressures involved and the size requirements of the feeder.
    The initial crush resistance (that is, the force required to initiate compression and irreversibly deform the feed element over and above the natural flexibility it has in its unused and unmashed state) can be no more than 7,000 N, can be no more than 5,000 N, or it can be no more than 3,000 N. If the initial crush strength is too high, then the molding pressure can cause the massalote to fail before compression is started. The initial crush strength can be at least 250 N, or it can be at least 500 N. If the crush strength is very low, then compression of the element can be started accidentally, for example, if a plurality of elements are stacked to storage, or during transportation.
    The power element of the present invention can be considered a collapsible brittle male, as this term adequately describes the functions of the element in use. Traditionally, brittle males comprise resin-bonded sand or are either a ceramic material or a male of massalote material. However, the feed element of the present invention can be manufactured from a variety of other suitable materials including metal (e.g., steel, aluminum, aluminum alloys, brass, copper, etc.) or plastic. In one embodiment, the element
    Petition 870180060827, of 7/13/2018, p. 24/53 feed is metal and, in a particular embodiment, the feed element is steel. In certain configurations it may be more appropriate to consider the feed element as a stranglehold of the massalote.
    In certain embodiments, the feed element may be formed of metal and may be preformed from a single metal sheet of constant thickness. In one embodiment, the feed element is manufactured by means of a stamping process, by means of which the sheet metal blank is radially stamped into a forming die by the mechanical action of a punch. The process is considered deep stamping when the depth of the stamped part exceeds its diameter and is achieved by re-stamping the part using a series of dies. To be suitable for press forming, the metal must be sufficiently malleable to prevent tearing or cracking during the forming process. In certain embodiments, the feed element is made of cold-rolled steel, with typical carbon contents ranging from a minimum of 0.02% (grade DC06, European standard EN10130 - 1999) to a maximum of 0.12% (grade DC01, European standard EN10130 - 1999).
    In the form used here, the term “compressible” is used in its broad sense and is only meant to mean that the length of the feed element between its first and second ends is shorter after compression than before compression. Preferably, said compression is irreversible, that is, after removal of the compression-inducing force, the feed element does not return to its original shape.
    In a particular embodiment, the side wall of the supply element comprises a first series of side wall regions (said series having at least one element) in the form of rings (which are not necessarily flat) of increasing diameter (when said series has more than one element) interconnected and fully formed with a second
    Petition 870180060827, of 7/13/2018, p. 25/53 series of side wall regions (said second series having at least one element). The side wall regions can be of substantially uniform thickness, so that the diameter of the hole of the feed element increases from the first end to the second end of the feed element. Conveniently, the second series of sidewall regions is cylindrical (that is, parallel to the axis of the hole), although they can be frustoconical (that is, inclined with the axis of the hole). Both series of side wall regions can be non-circular (eg oval, elliptical, square, rectangular, polygonal or in the shape of a flat cylinder). The second side wall region may constitute the second series side wall region closest to the second end of the feed element.
    In one embodiment, the free edge of the side wall region defining the first end of the feed element has an annular ferrule or flange directed inward.
    The compression behavior of the feed element can be changed by adjusting the dimensions of each side wall region. In one embodiment, all of the first series of side wall regions have the same length and all of the second series of side wall regions have the same length (which can be the same or different from the first series of side wall regions and which can be or different from the first side wall region). In a particular embodiment, however, the length of the first series of side wall regions and / or the second series of side wall regions increases incrementally towards the first end of the feed element.
    The feed element can have up to six or more of each of the first and second series of side wall regions. In a particularly preferred embodiment, four from the first series and five from the second series are provided, in another mode, five from the first series
    Petition 870180060827, of 07/13/2018, p. 26/53 and six of the second series are provided.
    In some embodiments, the distance between the inner and outer diameters of the first series of sidewall regions is 3 to 12 mm or 5 to 8 mm. The thickness of the side wall regions can be 0.2 to 1.5 mm,
    0.3 to 1.2 mm or 0.4 to 0.9 mm. The ideal thickness of the sidewall regions will vary from element to element and can be influenced by the size, shape and material of the feed element, and by the process used for its manufacture. In embodiments where the feed element is formed by a single metal plate press, the thickness of the mounting plate will be substantially the same as the thickness of the side wall regions.
    It is understood by the discussion presented that the food element is to be used in conjunction with a massalote. Thus, the invention provides in a second aspect a feeding system for metal casting comprising a feeding element according to the first aspect and a massalote attached to it.
    A standard massalote configured for use with horizontally divided mold machines typically comprises a hollow body with a curved exterior and an open annular base for mounting on a circular brittle (collapsible or not) on top. For certain applications, the massalot can also be non-circular with an annular base for mounting on a non-circular brittle core.
    In the feeding system of the second aspect, the massalot can be configured for use with vertically divided molding machines and can comprise a hollow body with an open side configured to match the feeding element mounting plate. The open side may be circular or non-circular, but it is preferably elongated (i.e., the massalote has a length and a width, the length of which is greater than the width). In specific embodiments, the open side can be substantially oval, elliptical, square, rectangular,
    Petition 870180060827, of 7/13/2018, p. 27/53 polygonal or in the shape of a flattened cylinder (that is, with two parallel straight sides and two partially circular ends). The walls of the massalote can be thicker in certain regions to increase the surface area on the open side and provide greater contact area and thus greater support in the mounting plate of the feed element. The wall of the massalot that forms the base of the feeder in use can also be profiled, for example, sloping down towards the position of the melt to further promote the flow and feeding of molten metal from the feeder into the melt.
    In use, the massalote will be oriented in such a way that its open side is along a substantially vertical plane and the feed element is located on the open side in such a way that the hole is provided closer to a lower end of the massalote than an upper end of the massalote. In this way, the design of the feed system will allow a molten metal head to be provided in the massalot above the hole to ensure an efficient supply of molten metal in the mold.
    The nature of the massalote is not particularly limited and can be, for example, insulating, exothermic, or a combination of both. Nor is its method of manufacture particularly limited, and it can be manufactured, for example, using both the vacuum forming process and the blasting method of the tap. Typically, a massalote is made from a mixture of low and high density refractory fillers (for example, silica sand, olivine, microspheres and hollow fibers of aluminosilicate and, chamotte, alumina, pumice, perlite, vermiculite) binders. An exothermic massalote additionally requires a fuel (usually aluminum or aluminum alloy), an oxidizer (typically iron oxide, manganese dioxide or potassium nitrate) and normally initiators / sensitizers (typically cryolite).
    Petition 870180060827, of 7/13/2018, p. 28/53
    Massalotes are available in numerous forms, including cylindrical, oval and domed. The massalot body can be flat top, domed, flat top dome, or any other suitable shape. The massalot can be conveniently attached to the feeding element by adhesive, but it can also be snap-fit or have a massalote molded around part of the feeding element. Preferably, the massalote is adhered to the feed element.
    It is preferable to include a Williams Wedge in the massalote. This can be either an insert or, preferably, an integral part produced during the formation of the massalot, and comprises a prism shape located on the internal roof of the massalot. During casting when the massalote is filled with molten metal, the Williams Wedge rim ensures atmospheric perforation of the molten metal surface and release of the vacuum effect inside the feeder to allow for more consistent feeding.
    The feeding system may additionally comprise a support pin for maintaining the massalote in the pattern of the mold before the massalot is compressed in the mold. The support pin will be configured for insertion through the displaced hole of the feed element and can be configured to prevent the massalot and / or feed element from rotating in relation to the pin during compression (for example, one end of the pin can be profiled from in such a way that it marries the massalote / feeding element only in one orientation). The support pin can also be additionally configured to include a device adjacent to the base of the pin, which is in contact and holds the feed element in position during the molding cycle. This device may comprise, for example, a spring loaded ball bearing or a spring clamp that forms a pressure / contact with the inner surface of the first side wall region of the feed element. Other methods of keeping the feeding system in place in the
    Petition 870180060827, of 7/13/2018, p. 29/53 standard plate during the molding cycle can be used, provided that certain services can be supplied to the oscillating plate of the molding machine, for example, the base of a molding pin can be temporarily magnetized using an electric coil, so such that when a steel or iron feeding element is used, the feeding system is held in place during molding, or the feeding system can be placed over a flammable bladder on the standard plate which, when inflated by means of air compressed, it will expand against the inner walls of the hole of the feeding element and / or massalote during molding. In both of these examples, the electromagnetic force or compressed air will be released immediately after molding to allow release of the mold and the standard sheet massager system. Permanent magnets can also be used at the base of the molding pin and / or in the area of the standard plate adjacent to the base of the molding pin, the strength of the magnet (s) being sufficient to hold the feed system in place during the molding cycle, but low enough to allow its release and maintaining the integrity of the mold and combined massalote system when removed from the standard plate at the end of the molding cycle.
    Brief Description of Drawings
    Modalities of the invention will now be described only by way of example with reference to the accompanying drawings, in which:
    Figure 1A shows a standard massalote with an angled base;
    Figure 1B shows a cross-sectional side view of the massalote of Figure 1A and the feed element positioned by means of a standard support pin in a mold pattern before molding;
    Figure 2A shows a front view of a supply element according to a first embodiment of the present invention;
    Figure 2B shows a side view of the
    Petition 870180060827, of 7/13/2018, p. 30/53 feeding of Figure 2 A;
    Figure 2C shows a front perspective view of the power element of Figures 2A and 2B;
    Figure 3 shows a front perspective view of a massalote according to an embodiment of the present invention;
    Figure 4A shows a cross-sectional side view of a standard support pin;
    Figure 4B shows a front view of the support pin of Figure 4A;
    Figure 5A shows a side cross-sectional view of a support pin for use in conjunction with the massalot of Figure 3;
    Figure 5B shows a front view of the support pin of Figure 5A;
    Figure 6 shows a cross-sectional side view of the massalote of Figure 3 used in conjunction with a non-compressible comparative feed element held in position by means of a support pin in a mold pattern prior to use on a molding machine. vertically divided mold;
    Figure 7 shows a cross-sectional side view of the massalote of Figure 3 used in conjunction with another comparative feeding element that is compressible, held in position by means of the support pin of Figure 5A in a mold pattern;
    Figure 8 shows a cross-sectional side view of the massalote of Figure 3 used in conjunction with an additional comparative feeding element, held in position by means of the support pin of Figure 5A in a mold pattern;
    Figure 9 shows a side view of the comparative feed element shown in Figure 8 after molding to show distortion of the flat surface;
    Petition 870180060827, of 7/13/2018, p. 31/53
    Figure 10 shows a front view of a comparative power element;
    Figure 10B shows a side view of the power element of Figure 10A;
    Figure 11 shows a cross-sectional side view of a feeding system including the massalote of Figure 3 mounted on the feeding element of Figure 2, held in position by means of the support pin of Figure 5A in a mold pattern;
    Figure 12 shows a cross-sectional side view of a feeding system according to an additional embodiment of the present invention;
    Figure 13A shows a front view of a supply element according to an additional embodiment of the present invention;
    Figure 13B shows a side view of the power element of Figure 13A;
    Figure 14 shows a front perspective view of a feeding system according to an additional embodiment of the present invention, in which the feeding element includes a ring in the form of two straight lateral ears 90 ° opposite to the plane of the plate. Assembly; and
    Figure 15 shows a front view of the feeding system of Figure 14, illustrating the extension of the ears with respect to the position of the hole.
    Detailed Description of Specific Modalities
    In the subsequent examples, various feeding systems have been tested, comprising combinations of standard feeding elements, standard feeders and feeding systems (elements and feeders) according to the present invention.
    The massalotes were all produced from commercial exothermic mixtures sold by Foseco under the trade names
    Petition 870180060827, of 7/13/2018, p. 32/53
    KALMINEX and FEEDEX, and produced using a core blasting process.
    Both standard and inventive metal feed elements were manufactured by pressing steel sheet. The sheet metal was cold rolled sweet steel (CR1, GS1449) with a thickness of 0.5 mm, unless otherwise stated.
    The molding test was conducted on a DISAMATIC molding machine (Disa 130). A feeding system was placed on a support pin attached to a standard horizontal plate (oscillating) which then oscillated 90 degrees so that the standard plate (face) was in a vertical position. A mixture of green sand molding was then blown (blasted) into the rectangular steel chamber using compressed air and then pressed against the two patterns that were at both ends of the chamber. After compression, one of the standard plates is swung back to open the chamber and the opposite plate pushes the finished mold over a protractor. Because the feed systems are enclosed in the compressed mold, it was necessary to carefully break each mold to open it to inspect the feed system. The support pin was located in the center of the standard (oscillating) plate (750 x 535 mm) on a ledge with a height of 20 mm. The second sandblasting pressure was 2 bar and the pressure of the compressed sheet was both 10 and 15 kPa.
    Figure 1A shows a prior art massalot 2 with an angled base 2a (mounting surface). Compared to a standard massalote, where the base would generally be perpendicular to the mold plate, the base is angled 10 °. Figure 1B shows massalot 2 attached to a known scalable and compressible metal feed element 4 according to WO2005 / 051568 mounted on a mold plate 6 by means of a fixed pin 8. Massalot 2 is arranged in such a way that the cavity of massalote 2b tilts down towards the mold plate 6. It can be seen
    Petition 870180060827, of 7/13/2018, p. 33/53 that the angle at which the cavity 2b generally tilts corresponds to the angle of the base 2a and, the greater the angle, the greater the feeding capacity of massalote 2, compared to a standard massalote. The practical limit that the base 2a can be angled is about 15 °. Anything else and the feed element 4 does not compress completely or evenly, and massalote 2 separates from feed element 4. Furthermore, the sharper the angle, the more difficult it is to remove the massalote and mold from the standard pin and plate . Thus, the problem of feeding a vertically divided mold cannot be satisfactorily solved merely by angling the base of the massalot in such a way that the cavity is tilted.
    Figures 2A, 2B and 2C show a feeding element according to an embodiment of the present invention, comprising a first end 12 for mounting in a mold pattern (not shown), an opposite second end comprising a mounting plate 14 for mounting in a massalote (not shown) and a hole 16 between the first and second ends 12, 14 defined by a stepped side wall 18. Hole 16 has an axis A through its center which is displaced from the center of the plate C by a distance x.
    The mounting plate 14 consists of a flat cylinder-shaped surface (orthogonal to the A axis) with two longitudinal straight edges 20 joined by a partially circular upper top edge 22 and a partially circular lower base edge 24. The The feed, therefore, has a length defined by the distance between the uppermost portion of the top edge 22 and the lowermost portion of the bottom edge 24 (that is, corresponding to the longitudinal axis of the mounting plate) and a width defined by the distance between the two longitudinal edges 20.
    A continuous rim or skirt 26 is provided around the peripheral edge of the mounting plate 14, which extends out of the first
    Petition 870180060827, of 7/13/2018, p. 34/53 end 12. The rim 26 in the present embodiment is oriented at 90 ° with the mounting plate 14 to thereby provide a socket in which a portion of a massalot can be received.
    As illustrated, the hole 16 is displaced towards the lower edge 24 of the plate 14 and is provided centrally across the width of the feed element 10.
    The feeding element 10 is formed by a single metal plate press and is designed to be compressible in use, thereby reducing the distance between the first end 12 and the second end 14 (i.e., the mounting plate). This feature is achieved by the construction of the stepped side wall 18, which in the present case comprises two circular stops between the first end 12 and the mounting plate 14. The first (and largest) stop 28 comprises a first region of the annular side wall 30, which is perpendicular to the plane of the mounting plate 14 (i.e., parallel to the axis of hole A); and a second annular side wall region 32, which is angled inward approximately 15 ° with respect to the plane of the mounting plate 14 and thus forms a frustoconical edge. The second (smaller) stop 34 is similar to the first stop 28 and comprises a first annular side wall region 30a that is perpendicular to the plane of the mounting plate 14 (i.e., parallel to the axis of hole A); and a second annular side wall region 32a, which is inclined inwardly approximately 15 ° with respect to the plane of the mounting plate 14 and thus forms a frustoconical edge. A frustoconical portion 36 extends from the inner circumference of the second side wall region 32a to the first end 12 to provide the opening for hole 16 and an inwardly directed ferrule 37 formed at the first end 12 to provide a mounting surface in the pattern of the mold and produce a notch in the choke of the resulting foundry feeder to facilitate its removal (removal of the core). In others
    Petition 870180060827, of 7/13/2018, p. 35/53 modalities, more stops can be provided and the first and / or second side wall regions can be inclined in a variety of ways or parallel to the axis of hole A and / or mounting plate 14.
    Figure 3 shows a mascot 40 according to an embodiment of the present invention. Massalot 40 is configured for use with vertically divided molding machines and comprises a hollow body 42 which is substantially cylinder-shaped in cross section, and which has an open side 44 configured to match the base of massalot 44a with a plate for mounting a supply element as shown in Figures 2A to 2C. The open side 44 is therefore substantially in the form of a flattened cylinder, with a length and a width where the length is greater than the width. In the embodiment shown, a horizontal recess 45 is provided in a rear wall 43 of the body 42 for locating a support pin (not shown). In addition, a Williams
    Wedge 48 is provided at the top of the body 42, extending from the rear wall to the open side 44.
    Figures 4A and 4B show a known support pin 50 used to hold the feed system in position in a molding pattern, typically for use on a horizontally split molding machine. The pin body 50A is generally cylindrical and has a 50b screw thread at the base to attach it in position in the molding pattern (usually metal). The top of the pin 50c is a circular rod of relatively small diameter, compared to the body, for location within a recess inside a massalot.
    Figures 5A and 5B show a support pin 55 which has been modified for use with the feeding system comprising the massalote of Figure 3 and the feeding element of Figures 2A-2C. The pin body 55a is cylindrical. The length of the pin body 55a has been shortened in relation to the pin shown in Figures 4A and 4B, while the
    Petition 870180060827, of 7/13/2018, p. 36/53 upper end 55c of the pin has been specially profiled in such a way that it matches the massalot in one orientation. The upper end 55c has been extended longitudinally with respect to the pin shown in Figures 4A and 4B. Rather than being a circular rod, the upper end 55c has a rectangular cross section, the smaller side being significantly smaller than the long side. This, combined with the extended length of the upper end of pin 55, gives a degree of flexibility (i.e., softness) to tolerate small movements without fracturing the massalot. Near the base of pin 55 (above the screw thread 55b), a hole 56 was drilled perpendicular to the longitudinal axis of pin 55, substantially, but not completely, through pin 55. A ball bearing 57 is retained at the partially closed end the hole 56, behind which a spring 58 and a threaded plug 59 rests. The threaded plug 59 partially compresses the spring 58 and pushes the ball bearing 57 through the end of the hole 56 in such a way that it protrudes partially on the side of the pin 55.
    Figure 6 illustrates massalote 40 of Figure 3 together with a brittle non-compressible sand bonded with known resin 60, when assembled in a vertical mold pattern 6 by a pin, before molding and compressing the sand mold. Note that the pin has a standard body 50a and that the end 55c is profiled to locate the recess 45 in order to orient the massalot in a vertical direction to ensure maximum efficiency during supply of molten metal in the mold. Thus, it can be seen that the first end of the brittle core is kept in contact with the mold pattern 6 before molding and, because the core is not compressible, it does not move in the molding to compact the sand in the region indicated by seta D. In addition, the pressure in the molding causes the massalote to tilt upwards and forwards, as indicated by the arrow E, which causes tension in the brittle male, resulting in fractures and ruptures,
    Petition 870180060827, of 7/13/2018, p. 37/53 particularly in the region indicated by the arrow F.
    Figure 7 illustrates the massalote of Figure 3 together with a sand choke component bonded with resin 70 and a known compressible feed element (according to an embodiment described in publication WO2005 / 051568) mounted on a vertical mold pattern 6 by a pin 55 of Figures 5A and 5B, before molding and compressing the sand mold. As in Figure 6, the first end of the feed element 71 is maintained in contact with the mold pattern 6 prior to molding, when the feed element 71 is in its uncompressed state. In molding, the stepped side wall of the feed element collapses during mold compression, allowing the feed element 71 to compress and compact the sand in the region indicated by arrow D. However, the molding pressures cause tension, resulting in some fractures of the strangulation component bonded with resin in region F.
    Figure 8 illustrates the massalote of Figure 3 together with a modified compressible feed element 80 mounted in a vertical mold pattern 6 by a pin 55 of Figure 5A before molding and compressing the sand mold. The feeding element 80 is provided in the massalote 40 in such a way that the mounting plate 14 matches the base of the massalote 44a on the open side 44. As in Figure 7, the first end of the feeding element 80 is kept in contact with the mold pattern 6 before molding, when the feed element 80 is in its uncompressed state. In molding, the stepped side wall 18 of the feed element collapses during mold compression, allowing the feed element 80 to compress and compact the sand in the region indicated by arrow D.
    However, as shown in Figure 9, it was surprisingly observed that when hole 16 is displaced from the center of the
    Petition 870180060827, of 7/13/2018, p. 38/53 mounting plate 14 and no rim is present, mounting plate 14 will bend, thereby allowing molten metal to escape through parts of massalote 40 in addition to hole 16.
    Figures 10A and 10B show a feed element similar to Figure 8, which was modified by pressing an arc-shaped rib 85. When used in conjunction with a massalote in a configuration similar to Figure 8, the additional feature has reduced slightly, but not eliminated, warping of the mounting plate when subjected to molding pressure.
    Figure 11 shows the feeding element 10 provided in massalote 40 in such a way that the mounting plate 14 matches the open side 44a of massalote 40 and the feeding element 10 is oriented so that the first end 12 is spaced apart. outside the lower portion of massalote 40, with the rim 26 surrounding a portion of the body 42.
    In this way, the rim 26 helps to locate and maintain the feeding element 10 in the massalote 40. In this particular embodiment, the mounting plate 14 is attached to the massalote by adhesion, however, it can alternatively be fixed by means of a pressure fitting. It was also surprisingly observed that the inclusion of a rim 26 can prevent the plate 14 from warping, thereby providing a stable and efficient feeding system.
    An alternative feeding system is shown in Figure 12, which is substantially similar to that shown in Figure 11, but in which the feeding element 90 is provided with a rim 92 which is inclined with respect to the hole A axis. In this case, the rim 92 extends out of the mounting plate 14, in a direction out of the first end 12, at an external angle of approximately 45 ° to the plane of the mounting plate 14. In other words, the rim 92 forms an angle of 45 ° with respect to body 42 of massalote 40.
    Petition 870180060827, of 7/13/2018, p. 39/53
    A further embodiment of the present invention is shown in Figures 13A and 13B. The feeding element 95 of Figures 13A and 13B is substantially similar to that shown in Figure 11. However, disposed between the mounting plate 97 and the stops 98 is an enlarged region 96.
    In this embodiment, the mounting plate 97 extends into the rim 99 at a constant distance around the periphery of the feed element 95. Thus, it is understood that the angle between the mounting plate 97 and the enlarged region 96 varies in around the periphery of element 95.
    It has been observed that an arrangement like this also prevents the mounting plate 97 from warping when the feed element is compressed during use and provides better sand compaction.
    An additional embodiment of the present invention is shown in Figure 14. As previously, the supply system of Figure 14 is substantially similar to that shown in Figure 11 (equal parts being described using corresponding reference numbers) except that the supply element 100 is provided with a rim in the form of two discrete ears 102 provided along two longitudinal straight edges 20 of the mounting plate 14. In other words, the rim is discontinuous and is provided only along the straight edges 20. It was observed that an arrangement as this is sufficient to prevent the mounting plate 14 from warping when the feed element 100 is compressed during use.
    Figure 15 shows a front view of the feeding system of Figure 14 and illustrates that each of the ears 102 that forms the rim extends below a point in a line (L1) that is in the direction of the width of the plate 14 and that it passes through axis A of hole 16 over a parallel line (L2) that passes through the center C of the mounting plate 14.
    It is understood that several modifications can be made in the modalities described above, without departing from the scope of the present invention, defined in the claims.
    Petition 870180060827, of 7/13/2018, p. 40/53
    Examples
    Various feeding systems were prepared using massalote 40 as in Figure 3, in combination with various feeding elements, and assembled as previously described. The massalote
    KALMINEX had the dimensions of 90 mm long x 60 mm wide x 60 mm deep, where length and width are the dimensions of the open face, and the depth of the feeder was measured from the open face to the closed rear wall of the feeder .
    The results are summarized in tables 1a and 1b below.
    Petition 870180060827, of 7/13/2018, p. 41/53
    TABLE 1a Details of the Feed Element
    Feeding system Type / element design Hole diameter Hole offset (HC) Rim Type / Design Rim width Rim angle Comparative 1 Resin bonded sandDrawing as in figure 6 25 mm 15 mm none at at Comparative 2 Bottom neck of resin-bonded sand plus 0.5mm circular compressible steelDrawing as in figure 7 18 mm 15 mm none at at Comparative 3 Compressible in the form of flat steel cylinder 0.5 mm Design as in figure 8 18 mm 15 mm none at at Comparative 4 Compressible in the form of flat steel cylinder 0.5 mm Design as in figures 10A / B 18 mm 15 mm none at at Example 1 Compressible in the form of flat steel cylinder 0.5 mm 18 mm 15 mm Continuous 5 mm 90 Example 2 Compressible in the form of flat steel cylinder 0.5 mm Design as in figure 14 18 mm 15 mm Discontinuous, two 1 cm clearances, one in each curved region of the mounting plate (top and bottom) 5 mm 909 Example 3 Compressible in the form of flat steel cylinder 0.5 mm 18 mm 15 mm Discontinuous, two 1 cm clearances, one in each curved region of the mounting plate (top and bottom) 5 mm 80 Example 4 Compressible in the form of flat steel cylinder 0.5 mm 18 mm 15 mm Discontinuous, two clearances of 1 cm, one in each curved region of the mounting plate (top and bottom) 5 mm 60 Example 5 Compressible in the form of flat steel cylinder 0.5 mm 18 mm 15 mm Discontinuous, two 1 cm clearances, one in each curved region of the mounting plate (top and bottom) 5 mm 60
    Petition 870180060827, of 7/13/2018, p. 42/53
    Feeding system Type / element design Hole diameter Hole offset (HC) Rim Type / Design Rim width Rim angle Example 6 Compressible in the form of flat steel cylinder 0.5 mm 18 mm 15 mm Discontinuous, two 1 cm clearances, one in each curved region of the mounting plate (top and bottom) 5 mm 50 Example 7 Compressible in the form of flat steel cylinder 0.5 mm 18 mm 15 mm Discontinuous, two 1 cm clearances, one in each curved region of the mounting plate (top and bottom) 10 mm 50 Example 8 Compressible in the form of flat steel cylinder 0.5 mm 18 mm 7.5 mm Discontinuous, two 1 cm clearances, one in each curved region of the mounting plate (top and bottom) 5 mm 50 Example 9 Compressible in the form of flat steel cylinder 0.5 mm 18 mm 7.5 mm Discontinuous, two clearances of 1 cm, one in each curved region of the mounting plate (top and bottom) 5 mm 90 Example 10 Compressible in the form of flat steel cylinder 0.5 mm Design as in figure 14 18 mm 15 mm Discontinuous, two discreet flaps along the longitudinal length of the mounting plate 5 mm 90 Example 11 Compressible in the form of flat steel cylinder 0.5 mm 18 mm 15 mm Discontinuous, two discreet flaps along the curved ends of the mounting plate 5 mm 90
    Petition 870180060827, of 7/13/2018, p. 43/53
    Table 1b - Module Test Results
    Feeding system Feeding System Details Compression plate pressure (kPa) Results and Observations Rim width Rim angle Hole offset (HC) Comparative 1 at at 15 mm 10 The element broke into pieces. Damaged massalote. Sand compaction under the massalote none / deficient Comparative 2 at at 15 mm 10 The element compressed evenly. Sand element bonded with fractured resin. Good sand compaction under the massalote Comparative 3 at at 15 mm 10 The element compressed 7 mm and penetrated the area of the massalote particularly at the top, that is, tilted, pushed inward. The mounting plate warped (see figure 9). The massalote damaged and / or separated into parts Comparative 4 at at 15 mm 10 The element compressed 8 mm. The mounting plate warped, but less than in comparative 3. A certain damage to the massalote and / or separation of the mounting face Example 1 5 mm 909 15 m 10 The element compressed 8 mm. No warping (of the mounting plate). No damage to the massalote. Good sand compaction under the massalote Example 2 5 mm 90 15 mm 10 The element compressed 8 mm. No warping (of the mounting plate). No damage to the massalote. Good sand compaction under the massalote Example 3 5 mm 80 15 mm 10 The element compressed 6 mm. No warping (of the mounting plate). No damage to the massalote. Good sand compaction under the massalote Example 4 5 mm 70 15 mm 10 The element compressed 7 mm. No warping (of the mounting plate). No damage to the massalote. Good sand compaction under the massalote
    Petition 870180060827, of 7/13/2018, p. 44/53
    Feeding system Feeding System Details Compression plate pressure (kPa) Results and Observations Rim width Rim angle Hole offset (HC) Example 5 5 mm 60 15 mm 10 The element compressed 6 mm. No warping (of the mounting plate). Slight inclination of the feeding system (massalote and element). No damage to the massalote. Good sand compaction under the massalote Example 6 5 mm 50 15 mm 10 The element compressed 6 mm. No warping (of the mounting plate). Slight inclination of the feeding system (massalote and element). No damage to the massalote. Good sand compaction under the massalote Example 7 10 mm 50 15 mm 10 The element compressed 8 mm. No warping (of the mounting plate). No damage to the massalote. Good sand compaction under the massalote Example 8 5 mm 50 7.5 mm 10 The element compressed 9 mm. No warping (of the mounting plate). Low / no slope of the supply system. No damage to the massalote. Good uniform sand compaction under the massalote Example 9 5 mm 90 7.5 mm 10 The element compressed 9 mm. No warping (of the mounting plate). Low / no slope of the supply system. No damage to the massalote. Good uniform sand compaction under the massalote Example 10 5 mm 90 15 mm 10 The element compressed 6 mm. No warping (of the mounting plate). Low / no slope of the supply system. No damage to the massalote. Good sand compaction under the massalote Example 11 5 mm 90 15 mm 10 The element compressed 6 mm, negligible deflection in the massalot. Negligible signs of warping (of the mounting plate) along the longitudinal sides (without rim), but no damage / splitting of the plate mass. Good sand compaction under the massalote
    Petition 870180060827, of 7/13/2018, p. 45/53
    Feeding system Feeding System Details Compression plate pressure (kPa) Results and Observations Rim width Rim angle Hole offset (HC) Example 2 5 mm 90 15 mm 15 The element compressed 7 mm. No warping (of the mounting plate). Slight inclination of the feeding system (massalote and element). Notable forward tilt of the feeding system. No damage to the massalote. Good sand compaction under the massalote Example 3 5 mm 80 15 mm 15 The element compressed 6 mm. No warping (of the mounting plate). Slight inclination of the feeding system (massalote and element). Notable forward tilt of the feeding system. No damage to the massalote. Good sand compaction under the massalote Example 5 5 mm 60 15 mm 15 The element compressed 6 mm. No warping (of the mounting plate). Slight inclination of the feeding system (massalote and element). Notable forward tilt of the feeding system. Some damage to the mobster. Good sand compaction under the massalote Example 6 5 mm 50 15 mm 15 The element compressed 6 mm. No warping (of the mounting plate). Slight inclination of the feeding system (massalote and element). Notable forward tilt of the feeding system. Some damage to the massalote. Good sand compaction under the massalote
    Petition 870180060827, of 7/13/2018, p. 46/53
    In order to evaluate the casting performance (feeding) of the massalotes, simulations were made using the MAGMASOFT simulation tool. MAGMASOFT is a tip casting process simulation tool supplied by MAGMA GiePeritechnologie GmbH that can model the solidification filling of cast parts in the mold, and is typically used for foundries to avoid costly and time-consuming casting experiences. The initial MAGMASOFT results were positive, but not entirely conclusive, because of some limitations in the MAGMASOFT simulation tool for this particular application (casting / feeder orientation), consequently, actual casting experiments were conducted.
    Two feeding systems were evaluated to determine if the feeder was able to feed upward in the casting when applied to the vertical plane of a casting. Comparative example 5 consisted of an exothermic FEDEX high-density massalote, shown in Figure 1B, the base angled at 10 ° and with a compressed steel element of 0.5 mm stepped circular (brittle male). The product, supplied by Foseco under the trade name FEEDEX HD VSK / DDMH and an internal volume of the massalote of 135 cm 3 . Example 12 consisted of an exothermic FEEDEX high density flattened cylinder shaped section, as shown in Figure 3, with an outer length (height, when in use) of 120 mm and a width of 80 mm, and a volume internal part of the 254 cm 3 massalote, attached to a compressible feeding element in the form of a flattened steel cylinder of 0.5 mm with a discontinuous rim with two 1 cm clearances, one in each curved region of the mounting plate.
    The first casting experiment to assess feed performance consisted of a 13 cm vertically square plate casting, the plate having a T-shaped cross section when
    Petition 870180060827, of 7/13/2018, p. 47/53 seen from above. The mold contained cavities for two castings, each base connected to a single entry channel. The feeder was centered on the vertical face of the plate using a pin located on the standard plate. The molds then assembled (closed), rotated 90 degrees and cast vertically. The castings were made in ductile iron (grade GJS500) and cast at 1,360 ° C. Once cooled, the castings were removed from the mold and inspected by sectioning through their vertical centerline. The melt produced using the feeding system of comparative example 5 showed the presence of a large blowing contraction in the upper part of the melt above the feeder, whereas the melt produced using example 12 did not present casting defects, only inconsiderable porosity and stuffing in the feeder choke.
    The second casting experiment was conducted under casting conditions on a green sand molding line from Disamatic. The chosen casting was a generic 10 kg ductile iron casting that was previously successfully produced in two thick sections and produced by the Disamatic molding machine. The test feeders were placed on locating pins before molding and the molds produced using a sandblasting pressure of 2 bar and a compression pressure of 10-12 kPa. The inspection of the molds before closing showed excellent compaction of sand in the surrounding area and under the massalot and the compressed feeding element. Removal of the feeder tap from both feeder designs was excellent, leaving only a small footprint of the cast.
    Inspection of the casting produced using comparative example 5 showed that the lower thick section of the casting around the lower feeder was solid, that is, no sign of porosity, however, the section of the thick casting below the upper massalot had
    Petition 870180060827, of 7/13/2018, p. 48/53 a certain porosity, and the feeder drained. In contrast, the casting produced using the feeding systems of example 12 showed no signs of porosity in the casting and specifically none in either the lower or upper thick sections around the two feeders.
    The second casting experience shows that the feed systems of the invention satisfy the physical demands and dimensional constraints of high pressure molding lines, and the feed requirements driven by the volume of castings produced in vertically divided molding machines.
    Petition 870180060827, of 7/13/2018, p. 49/53
    权利要求:
    Claims (16)
    [1]
    1. Feed element, for use in metal casting, comprising:
    a first end for mounting on a pattern of mold or oscillating plate;
    a second opposite end comprising a mounting plate for mounting in a bulkhead; and a hole between the first and second ends defined by a side wall;
    10 the feed element being compressible in use to thereby reduce the distance between the first and second ends;
    characterized by the fact that the hole has an axis that is displaced from the center of the mounting plate and in which an integrally formed rim extends on a periphery of the mounting plate.
    15
    [2]
    2. Feed element according to claim 1, characterized by the fact that the mounting plate is elongated and / or asymmetric and, when oriented in use, has a vertical dimension that is greater than a horizontal dimension, thus defining a pair of long peripheral edges.
    20
    [3]
    Feed element according to claim 2, characterized in that the ring extends at least partially along the long peripheral edges of the mounting plate.
    [4]
    Feed element according to any one of claims 1 to 3, characterized in that the hole is located
    25 centralized shape with respect to the nominal width of the mounting plate.
    [5]
    Feed element according to any one of claims 1 to 4, characterized in that the ring is in the form of a pair of ears, each extending along a respective long peripheral edge.
    Petition 870180060827, of 7/13/2018, p. 50/53
    [6]
    Feed element according to any one of claims 1 to 5, characterized in that the ring extends continuously around the periphery of the mounting plate to form a skirt.
    5
    [7]
    Feed element according to any one of claims 1 to 5, characterized in that the ring extends along each long peripheral edge at least one point in a line defined by the tangent to the edge of the hole closest to the center of the plate to a point on a line in the direction of the nominal width of the plate that passes
    10 through the center of the plate.
    [8]
    Feed element according to any one of claims 1 to 7, characterized in that the mounting plate is flat and the rim is angled out of the first end of the feed element at an angle in the range of 10 ° to 160 o with respect to the
    15 mounting plate.
    [9]
    Feed element according to any one of claims 1 to 8, characterized in that the depth of the rim is at least 5 mm.
    [10]
    Feed element according to any one of the claims 1 to 9, characterized in that the side wall that defines the hole comprises at least one stop, each stop being formed by a first side wall region and a second region side wall contiguous with the first side wall region, and in which the second side wall region is provided at a different angle, with respect to the axis of the
    25 hole, with the first side wall region.
    [11]
    Supply element according to any one of claims 1 to 10, characterized in that the initial crushing resistance of the supply element is not more than 7,000 N.
    [12]
    12. Power element according to any of the
    Petition 870180060827, of 7/13/2018, p. 51/53 claims 1 to 11, characterized by the fact that the initial crushing resistance of the supply element is at least 250 N.
    [13]
    Feed element according to any one of claims 1 to 12, characterized in that the side wall of the feed element comprises a first series of side wall regions, the series having at least one element, in the form of rings of increasing diameter interconnected and integrally formed with a second series of side wall regions, the second series having at least one element.
    [14]
    Feed element according to claim 13, characterized in that the side wall regions are of uniform thickness so that the diameter of the hole of the feed element increases from the first end to the second end of the feed element.
    [15]
    Feed element according to either of claims 13 or 14, characterized in that the length of the first series of side wall regions and / or the second series of side wall regions increases incrementally towards the first end of the power element.
    [16]
    16. Feed system for metal casting, characterized by the fact that it comprises a feed element as defined in any one of claims 1 to 15 and a massalote attached to it.
    Petition 870180060827, of 7/13/2018, p. 52/53
    1/13
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    法律状态:
    2018-04-24| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application according art. 36 industrial patent law|
    2018-08-21| B09A| Decision: intention to grant|
    2018-09-11| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 05/12/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP11250182.0A|EP2489450B1|2011-02-17|2011-02-17|Feeder element|
    PCT/GB2011/001678|WO2012110753A1|2011-02-17|2011-12-05|Feeder element|
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