• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The device for demolding negative in thermoplastic injection molds includes an ejector (3), comprising an ejector profile (5) for its attachment to an ejection plate (2); and a figure hairpiece (6) with a profile complementary to the piece (4) to be molded, wherein said expeller (3) also comprises a flexible element (7) disposed between the expeller profile (5) and the Figure 6 (6), which pushes said figure hairpiece (6) to demold the negative by angular displacement and stretches said figure hairpiece (6) to return the ejector (3) to its injection position. It makes it possible to dispense with mold slides, which means that, in the first place, we do not need these spaces, nor the expensive sliding ones, nor the laborious mechanized ones for their installation in the molds. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2681168A1
    申请号:ES201730319
    申请日:2017-03-10
    公开日:2018-09-11
    发明作者:Alberto Navarra Pruna
    申请人:Comercial de Utiles y Moldes SA；
    IPC主号:
    专利说明:

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    DESCRIPTION
    Negative demoulding device in thermoplastic injection molds
    The present invention relates to a device for negative demoulding in thermoplastic injection molds.
    Background of the invention
    To mold any type of injected part, it is essential to remove the piece from the punch of the mold, for which cylindrical ejectors are used, which duly installed in ejector plates, actuated by the injection machine itself, allow the mold part to be demoulded.
    In the molds that, due to the structure of the injected piece, have areas that do not allow direct demolding, because part of the geometry of the piece has negative zones, the installation of devices called inclined slides is essential.
    These devices installed in the punch of the mold are activated in all cases through the ejector plates at the time of expulsion, by means of inclined bars that slide through the punch of the mold and are moved by sliding mechanisms, fixed in the ejector plates.
    In order for the ejection system with the inclined bars to be feasible, we must attach some sliding mechanism that converts the movement perpendicular to the mold opening, in angular movement to allow these bars to move with the angles with which they have been machined in mold.
    Basically, these mechanisms consist of a sliding body, which slides through friction structures that are fixed in the ejector plates, and that by means of properly machined housings house the inclined bars with the angles that are properly calculated correspond to each negative to unmold. The inclined bars slide into the mold punch during the expulsion cycle and according to the machined angle the required demouldings are obtained, that is, for each depth of negative the angle to be machined must be adapted.
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    When the piece to be injected presents different zones with negatives of different dimensions, the process is complicated and automatically increasing both the development of the project, as well as the machining of the mold, in addition in many cases, the complexity of the design is complicated by the different angles required, as well as for the spaces that we have to install these devices, since when they are inclined drills, the dimensional projection of them requires much larger surfaces.
    When these elements must be installed in small molds, for example, in negatives of a maximum of 3 mm., Where the dimensions are much smaller, the problems are increased by the lack of these vital spaces essential for the installation of the system.
    In the utility model ES1031883U, of the same holder as the present application, a molding-ejector accessory for injection molds is described, intended to act as a molding complement of small negatives. In this utility model, a rod fixed to the mold ejection plate and provided with a head or figure insert whose shape coincides with the piece to be obtained is described. Said head is attached to the rod by means of an elastically deformable neck, which allows lateral displacement of the head relative to the rod.
    The solution we propose is to standardize a very similar system, in terms of installation in the mold, since it requires a minimum space, but that will carry out the demoulding movements through the sliding that will be carried out through mechanized angular holes in the punch of the mold, instead of using the force of the spring, as in the case of the aforementioned utility model, totally disregarding the mentioned slides, so that in the first place we do not need these spaces, or the expensive slides, or the laborious mechanized for installation in the molds.
    Description of the invention
    With the device of the invention, the aforementioned drawbacks are resolved, presenting other advantages that will be described below.
    The device for unmolding negatives in thermoplastic injection molds according to the present invention includes an ejector, comprising:
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    - an ejector profile for attachment to an ejection plate; Y
    - a figure insert with a profile complementary to the piece to be molded,
    and characterized in that said ejector also comprises a flexible element disposed between the ejector profile and the figure insert, which pushes said figure insert to demold the negative by angular displacement and stretches said figure insert to return the ejector to its injection position
    Advantageously, said flexible element is a non-compressible helical spring, that is, with its turns which are always in contact with each other at least one point, complemented by a cable installed inside it, and tensioned in such a way, that it prevents the Dock may lengthen.
    Said flexible element is connected to the figure insert and the ejector profile by means of a connection portion, and convert the assembly as a single mechanism.
    That is, it is an ejector that can be housed in the ejector plates through a simple drill, just like a conventional ejector, but with a particularity, and that is that this ejector comprises a tension-compression element with a certain length , which is neither compressible nor extensible. This ejector, therefore, has the particularity that, due to its central structure, flexible zone, which joins both ends, it becomes a mechanical worm that adapts its geometry to the different holes through which it must slide.
    In the mold we must mechanize the inclined drill that we need in the punch, while in the ejector plates we will mechanize the housing drill for its perpendicular fixation.
    When we act on the ejector plates, they will move perpendicularly normally by pushing the worm ejector, which has the figure insert that will move through the inclined drill, and therefore following the direction with which it has been machined, incorporated at the opposite end. .
    With this system we achieve that the angular displacements follow the established path faithfully, while the sliding of the ejector plates is conventional, that is, that they do not require any additional cost.
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    Brief description of the drawings
    For a better understanding of how much has been exposed, some drawings are attached in which, schematically and only by way of non-limiting example, a practical case of realization is represented.
    Figure 1 is a view of the components of the negative demoulding device in thermoplastic injection molds according to the present invention;
    Figure 2 is a sectional elevational view of a mold comprising the device for negative demoulding in thermoplastic injection molds according to the present invention, in its injection position on the left side and in its ejection position in the Right part; Y
    Figure 3 is an elevation view of the detail of the area of the figure insert and the part during its demolding.
    Description of a preferred embodiment
    First, it should be noted that the device according to the present invention is used to demold negatives that are usually referred to as small, that is, with dimensions less than 3 mm, in their negative zone.
    Figure 1 shows the components that are part of the device according to the present invention, which is referred to as a whole as an ejector and is identified with the reference number 3, to facilitate the description.
    This ejector 3 comprises an ejector profile 5 fixed to an ejection plate 2 of the mold 1, as can be seen in figure 2, a hairpiece of figure 6, which has a shape complementary to the piece 4 that it is desired to mold, and a flexible element 7.
    According to the embodiment shown, said flexible element 7 is a helical spring complemented with a solidary cable, in which its turns are in contact with each other at least at one point. That is, said element is not compressible or extensible, but is deformed to adapt to the shape of the mold housing where it travels, as will be described later.
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    The function of said flexible element 7 is to push said insert of Figure 6 to unmold the negative by angular displacement and to pull said insert of Figure 6 to return the ejector 3 to its injection position.
    To facilitate this pushing and stretching action of the flexible element 7, it is connected to the ejector profile 5 and to the insert of figure 6 by means of a threaded, welded, or embedded connection portion 8, which converts it as a single mold release element. , as shown in figure 1.
    A mold 1 is shown in Figure 2 which includes the negative demoulding device according to the present invention.
    Conventionally, said mold comprises an ejection plate 2, to which the ejector 3 is fixed.
    This ejector 3 is housed inside a machined angular housing in the punch of the mold, 1 and as seen in Figure 2, to allow the demolding of parts with a negative configuration.
    Said housing has a polygonal cross-section, for example, square, that is, not circular, to prevent rotation of the insert of Figure 6 inside. For this, the insert of Figure 6 also defines a corresponding polygonal cross section.
    In the left part of figure 2 the mold 1 is shown in its injection position, while in the right part the mold is shown in its ejection position.
    In the punch of the mold 1 the sliding path of the ejector device is machined, which thanks to the flexible element 7, adapts its path to follow, on the one hand, the figure profile follows the machined path in the punch of the mold, while the other connection embedded in the ejector plate will follow the trajectory of the ejector plates.
    It is important to highlight that the described system is perfectly adapted for the demolding of small elements, mainly due to the ease of its machining and installation, but that its use is not appropriate for large demouldings, due to the simple fact that in all cases it is it is a single deformable element, not compressible, or extensible, so that a part of it can follow a vertical path, while the
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    another part follows an inclined path, referring to the first, therefore the vertical paths are different, although on a small scale, and always within the operating tolerances within the sector. In figure 3, the demoulding effect can be seen graphically
    The demolding process by the device according to the present invention is described below.
    As can be seen in the left part of figure 2, in this position the injection of the mold 1 is carried out and the flexible element 7 has a vertical lower portion and an inclined upper portion. It should be noted that, in this embodiment, the spiral coil turns are in contact with each other in their entirety except in the transition zone from the lower vertical portion to the inclined upper portion, where the turns are in contact at one point.
    When it is desired to eject or unmold the part, the ejection plate 2 moves vertically upwards. This movement causes the flexible element 7 to slide upwards, also defining a vertical lower portion and an inclined upper portion therein. As can be seen in figure 2, said transition zone (indicated by the letter Z in figure 2) is always at the same height with respect to the mold 1.
    The thrust caused by the flexible element 7 on the insert of Figure 6 causes the dismounting movement shown in Figure 3, which forms a right angle with respect to the direction of movement of the ejector 3, that is, with respect to the longitudinal axis of the insert. of figure 6.
    Once the piece 4 has been demoulded, the ejection plate 2 will return to its injection position, so that the flexible element 7 stretches from the insert of figure 6 to its injection position, shown in the left part of figure 2.
    Although reference has been made to a specific embodiment of the invention, it is apparent to one skilled in the art that the described device is susceptible to numerous variations and modifications, and that all the mentioned details can be replaced by other technically equivalent ones, without departing from the scope of protection defined by the appended claims.
    权利要求:
    Claims (3)
    [1]

    1. Device for negative demoulding in thermoplastic injection molds, which includes an ejector (3), comprising:
    5 - an ejector profile (5) for attachment to an ejection plate (2); Y
    - a hairpiece of figure (6) with a profile complementary to the piece (4) to be molded, characterized in that said ejector (3) also comprises a flexible element (7) disposed between the ejector profile (5) and the Figure insert (6), which pushes said figure insert (6) to unmold the negative by angular displacement and pulls said figure insert (6) to return the ejector (3) to its injection position.
    [2]
    2. Device for unmolding negatives in thermoplastic injection molds according to claim 1, wherein said flexible element (7) is a non-compressible or extensible helical spring.
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    [3]
    3. Device for unmolding negatives in thermoplastic injection molds according to claim 1, wherein said helical spring is combined with a cable, forming a single flexible element (7).
    20 4. Device for unmolding negatives in thermoplastic injection molds
    according to claim 1, wherein said flexible element (7) is connected to the insert of figure (6) and to the ejector profile (5) by means of a connection portion (8).
    类似技术:
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    同族专利:
    公开号 | 公开日
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    US20180257280A1|2018-09-13|
    US10682794B2|2020-06-16|
    ES2681168B1|2019-06-21|
    EP3372377B1|2021-05-05|
    JP2018149810A|2018-09-27|
    ES2881460T3|2021-11-29|
    PT3372377T|2021-07-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPH04251724A|1991-01-29|1992-09-08|Sony Corp|Mold device|
    CN203171907U|2013-01-12|2013-09-04|华东交通大学|Angle pin structure of die|
    ES2428238A1|2013-06-25|2013-11-06|Comercial de Útiles y Moldes, S.A.|Device for demolding parts|
    CN103341958A|2013-07-03|2013-10-09|科益精密模塑（太仓）有限公司|Automobile lamp mask die flexible push rod mechanism|
    US3642417A|1970-04-29|1972-02-15|Holdt J W Von|Release apparatus for diecasting assembly|
    JPH0586328B2|1985-11-01|1993-12-10|Daicel Chem|
    ES1031883Y|1995-08-11|1996-08-01|Pruna Alberto Navarra|MOLDING-EJECTOR ACCESSORY FOR INJECTION MOLDS.|
    ES2345697B1|2007-12-31|2011-09-28|Jose Luis Gonzalez Palacio Fenech|DEVICE FOR THE DISMOLDING OF NEGATIVES IN PLASTIC INJECTION.|JP6985187B2|2018-03-15|2021-12-22|トヨタ自動車株式会社|Resin body mold|
    EP3708332A1|2019-03-13|2020-09-16|Comercial de Utiles y Moldes, S.A.|Device for demoulding negatives in thermoplastic injection moulds|
    IT201900010392A1|2019-06-28|2020-12-28|Stocchiero S R L|EQUIPMENT FOR MOLDING HANGERS FITTED WITH HOOKS|
    法律状态:
    2018-09-11| BA2A| Patent application published|Ref document number: 2681168 Country of ref document: ES Kind code of ref document: A1 Effective date: 20180911 |
    2019-06-21| FG2A| Definitive protection|Ref document number: 2681168 Country of ref document: ES Kind code of ref document: B1 Effective date: 20190621 |
    优先权:
    申请号 | 申请日 | 专利标题
    ES201730319A|ES2681168B1|2017-03-10|2017-03-10|Device for demolding negative in thermoplastic injection molds|ES201730319A| ES2681168B1|2017-03-10|2017-03-10|Device for demolding negative in thermoplastic injection molds|
    ES18382143T| ES2881460T3|2017-03-10|2018-03-07|Device to unmold negatives in thermoplastic injection molds|
    PT183821438T| PT3372377T|2017-03-10|2018-03-07|Device for demolding negatives in thermoplastic injection molds|
    EP18382143.8A| EP3372377B1|2017-03-10|2018-03-07|Device for demolding negatives in thermoplastic injection molds|
    US15/915,662| US10682794B2|2017-03-10|2018-03-08|Device for demolding negatives in thermoplastic injection molds|
    JP2018042725A| JP2018149810A|2017-03-10|2018-03-09|Mold release machine for negative part of thermoplastic resin injection for molding mold|
    HK18112228.9A| HK1251802A1|2017-03-10|2018-09-21|Device for demolding negatives in thermoplastic injection molds|
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