• 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:
    This invention relates to a method and an apparatus for the production of ribbed pipes. The apparatus comprises a core (8, 9, 10) which together with an extrusion sleeve (4) forms a nozzle (11) through which a plastic material is fed into a moulding space (12) defined between a mandrel (9) and chill moulds (1, 2) moveable with respect to the mandrel. Ribbed pipes produced by means of known apparatuses have, for various reasons, an uneven inner face, incomplete ribs or air closures and weak seams in the pipe walls and ribs. These disadvantages can be eliminated by such a dimensioning of the moulding space (12) of the apparatus and the grooves (13) of the chill moulds that the volume of a space defined between a plane (20) extending adjacent to the end face of the extrusion sleeve, a surface (16) of the mandrel, and a plane (17) comprising the envelope surface of the kernel (10) equals to the combined volume of the grooves (13) positioned within the area of the mandrel at each particular moment.
    公开号:SU1570646A3
    申请号:SU874202224
    申请日:1987-03-18
    公开日:1990-06-07
    发明作者:Ярвенкуля Юри
    申请人:Упонор Н.В. (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to the manufacture of tubular plastic products and can be used in chemical industry.
    Gel of the invention - improving the quality of pipes.
    In Fig. 1, a device for the production of finned tubes is given, general view; -h in Fig. 2, the same longitudinal section;
    fig.Z - the same, the first option; on . 4 is the same with a flow of plastics material; figure 5 is the same option; figure 6 is the same, with balancing pressure grooves.
    The device (Fig. 1) for the manufacture of finned tubes contains metal press-drums I and 2, pressing means installed with the possibility of U4
    by moving around two endless paths with a closed path and connecting with each other within the section of the guide rails 3 to form a cylindrical mold. An extruder 4, connected to the shaping head 5 of the material supply means 6, passes into the aforementioned mold. The finished pipe comes from the other end of the mold 3 formed by metal molds 1 and 2, the Head 5 is connected to the tool 6 by an adapter 7,
    The spindle 8 (Fig. 2) is located on the central axis of the device completely within the extruder 4 and contains a part 5 having a constant diameter, i.e. The conically expanding part 8a of the Dorn 9 is located after the expanding part of the spindle 8 completely outside the extruder 4, and the core 10 having a constant diameter is located after the mandrel 9. The core 10 is equipped with cooling means to increase the rigidity of the pipe. The spindle 8, the mandrel 9 and the core 10. Form the core of the device,
    The extruder 4 and part of the spindle 8a form between them a tubular channel — an annular (annular) nozzle 113 through which the plastic material to be pressed is fed into the forming space 12 defined by the rod, metal molds 1 and 2 and the mandrel 9. to obtain a pipe having a ribbed outer surface, the inner surface of the metal molds 1 and 2 has a set of grooves 13 spaced from each other by a certain distance, into which plastic material is forcedly fed rmovani pipe.
    The proposed device provides an exceptionally smooth flow of plastic material due to a certain proportioning of the volumes of the two parts 14 and 15 of the Forming Space J2 relative to each other (FIG. 2).
    The cavity 14, the volume of which is referred to as the working volume, is annular and has a triangular cross section. This cavity 14 is defined between the plane 16 adjacent to the end surface of the extruder 4 perpendicular to the center line of the mandrel 9, the surface 17 of the mandrel

    about

    five
    0
    and a surface 18 containing the envelope surface of the core 10. The space J5, the volume of which is called the filling volume, is constituted by the combined volume of the grooves 13 located between the extruder 4 and the core 10, i.e. side or within the section of the mandrel 9, at each moment taken separately. The volumes of the cavities 14 and 15 are identical, with the largest disconnection being approximately 25%,
    The length of the mandrel 9 (Fig. 2) is three times longer than the distance between the grooves 13. It is advisable that the length of the mandrel 9 corresponds to a multiple of the said distance. With a mandrel length of -9, corresponding to a multiple of the distance between the grooves 13, reduced by one width of the groove 13, the pressure change is minimal. The forming surface 17 of the mandrel 9 is at an angle of approximately 20 ° with respect to the central axis of the rod (Fig. &Quot; 2). This angle can vary from 2 ° to 30 °, with the most preferred angle being about 15 °. The exact angle is determined by the required displacement. The mandrel surface 17 is not purely cylindrical, but is somewhat curved along the arc so that the angle between the generator and the central axis of the rod is greatest at the beginning of the mandrel 9 and smallest at its end, i.e. is parabolic.
    Dorn 9 is formed by a cylindrical part 9a (Fig. 3) located at the spindle 8 and connected to a conically expanding part 9b, which is connected to the cylindrical core 10. The working volume of this device is similar to that shown in Fig. 2, i.e. this cavity is defined between the planes 16 and the surface 37, which in this case is also located above the cylindrical part 9a of the mandrel 9, the filling volume of this device is composed of grooves 13 located inside the surface portion 17. These grooves 13 are located at a certain level. The filling volume of the grooves 13 must be filled with plastic material so that the total volume of all the grooves may be larger than the volume of the cavity 14 (Figs. 3 and 6). Rod 8 is located
    on the center line of the device, it contains a cylindrical part and a conically expanding part, which is provided with a cooling part having a constant diameter and containing cavities (not shown) for a cooling agent. The extruder 4 and the rod 8 form between them an annular nozzle 9, through which the plastic material is fed into the forming cavity 11 defined by metal molds 1 and 2, the rod and the extruder 4. In order to obtain a pipe having a ribbed outer surface, the surface of the metal molds 1 and 2. is provided with mutually spaced collimated grooves 13, into which (plastic material is forcibly supplied to form fins.
    The inner surface of the metal molds 1 and 2 is equipped with pressure-balancing additional grooves 19, which are sized so that they remain completely or partially empty at normal pressure of the material, taking into account its dynamic viscosity.
    The balancing pressure grooves 19 of FIGS. 5 and 6) are very narrow 0.3-3 mm, preferably 1 mm, and are located on both sides of the rib grooves 13 parallel to the latter.
    The balancing pressure grooves 19 are very deep in width, the ratio of their depth and width is (3: 1) - (15: 1), preferably 10: 1. If the groove width is, for example, 1 mm, it has a depth of 10 mm. The pressure balancing grooves 19 are typically aligned with the costal grooves 13 having a width of 4 mm and a depth of 14 mm. However, these dimensions of the pressure balancing grooves 19 and the ratio between the grooves 19 and 13 depend on the material used for the pipe, especially its dynamic viscosity.
    A layer 20 of plastic material, closer to spindle 8 and mandrel 9 and shown by cross-hatching lines (bits, 4), passes in the form of a laminar flow into the space between the core 10 and metal molds. 1 and 2, where it forms the wall of the pipe. A layer of plastic 21, located closer to the extruder 4 and shown in parallel lines, is fed into the grooves 13 of the metal npecft-forms 1 and 2, and is pressed fully into accordance with the inner surface of the metal molds 1 and 2.
    In the production process of pipes through the proposed device
    The pressurized plastic material is fed through a channel-nozzle 1 J into the forming cavity 12.
    The volume of material fed through the annular channel per unit of time, is adjusted so that it is at least equal to the sum of the volume of the pipe wall that is molded and the filling volume of those grooves 13 of the pressing means that pass by
    an annular channel during said unit of time, and equal to the combined volume of those grooves of the pressing means that pass by this annular channel and
    the wall of the pipe which has been molded during said unit of time. The feed rate of the material into the nozzle 11 is maintained equal to the speed of movement of the metal molds 1 and 2.
    The feed rate of the material may deviate from the speed of the pressing means by 25%. The material portion 20 forms the pipe wall, the portion 21 is fed into the grooves 13 and fills them, while the metal molds 1 and 2 are displaced in the direction of the arrow shown in Figures 2 and 3. Since the working volume 14 and the filling volume 15 are identical, the material flow is very smooth and even in the forming space 12, so that there are no large air inclusions or weak joints between different layers of material in
    within the core section 10.
    The flow of material can be adjusted in axial and radial directions by varying the ratio between the temperatures of the metal press lorm 1
    and 2 and rod. For example, if the grooves 13 of the metal molds 1 and 2 are not completely filled, the temperature of the core may decrease, and the temperature of the metal molds I
    and 2 can be increased so that the axial flow of material is impeded and the radial flow is accelerated. As a result, the grooves 13 are filled better.
    Through the present invention it is easy to produce pipes, the fins of which are made of plastic materials of different properties, which may, for example, differ in color, or may be made of a material with modified toughness, while the wall of the pipe is made of ordinary plastic material. In this case, the plastic material is fed from the annular channel 11 as two concentric layers, which correspond to layers 20 and 21 in Fig. 40. These layers are fed through separate extruders (not shown).
    In the production process of pipes, through the proposed device (FIGS. 5 and b), the pressurized plastic material is fed through a nozzle into the forming space 12. A part of this material forms the pipe wall, while the rest of the material is fed into the rib grooves 13 metal presses -forms 1 and 2 to fill them simultaneously when the metal molds 1 and 2 are displaced in the direction of the arrow shown in FIG. The volume of the forming space changes dramatically when the groove 13 reaches the forming space. For this reason, u3 is possible, due to fluctuations in the material feed and the speed of movement of the metal molds 1 and 2, the pressure of the material flowing through the forming space 12 changes to a large extent. However, due to the pressure balancing groove 19, the pressure peaks are not as high as known devices, since the material can act in the pressure balancing grooves 19, the latter acting as safety valves. The degree of filling of these pressure balancing grooves 19 depends on the height of the pressure peaks (peaks). Under normal conditions, only a low protrusion of material inside the pressure balancing grooves 1 9 is formed (Fig. 6),
    Thus, the pressure balancing grooves 19 may be located, in addition to the immediate proximity of the costal grooves 13, for example in the middle between the latter. The pressure balancing grooves 9 need not necessarily be parallel to the costal grooves, but may also have a different direction. Conducted tests show that the plastic material flowing inside the extruder 4 closest to spindle 8 passes along the surface of the mandrel 9 without any turbulence to the core section 0, where it forms a defect-free pipe wall. A layer of plastic material flowing inside the extruder 4 closer to the wall is completely passed into the grooves J3 of the metal molds 1 and 2. Thus, a very smooth flow is obtained in which there are no turbulences and which therefore produces high quality pipes . In the proposed device, no percussion pressure applications are obtained due to the fact that the length of the working volume is dimensioned when, when one groove J3 of the metal lress mold 1 and 2 closes, the other groove 13 simultaneously opens up with the nozzle so that the volume of the forming cavity 12 is supported constant.
    Practical tests show that the flow of plastics material is in the state of greatest degree of smoothness when the length of the mandrel 9 is a multiple of the distance between the grooves 13, in particular, the quadruple value of this distance. It is desirable that the angle between the generatrix of the conically widening part of the mandrel 9 and the central axis of the rod is 2-30 °, preferably 15 °. one
    Due to the smoothness of this flow, the angle between the generatrix of the conically expanding part and the central axis changes in such a way that it has its largest value at the beginning of the mandrel part 9a and its smallest value at the end of this part. The surface of this part of the mandrel 9 may therefore be parabolic.
    The filling volume of the grooves 13 represents only a fraction of the combined volume of these grooves, which determines the formation of peaks of pressure inside the material. This is accomplished by supplying the inner surface of metal molds 1 and 2 not only with grooves 13, which form the filling volume, but also with much narrower pressure balancing grooves 19, which are of such size that they remain completely or partially empty at ordinary pressure material in this device as a result of its dynamic viscosity.
    Through these pressure balancing grooves 19, no maxima (peaks) of the main pressure within the cavity are obtained, since the material begins to flow into the pressure balancing grooves 19 when this pressure exceeds the normal value.
    Thanks to balancing pressure. The grooves 1 to 9 offer the proposed device to produce ribbed tubes in the usual way so that the grooves 13 of the metal molds 1 and 2 are completely filled, whereby the pressure balancing grooves 19 prevent the formation of pressure peaks. In addition, the proposed device can be used to produce pipes having ribs that are not equal in height, whereby the pressure balancing grooves 1 9 can be such as to help maintain the degree of filling of the rib grooves 13 at a constant value.
    In order for the pressurized material to first fill the rib grooves 13 and only the pressure-balancing grooves 19, if the pressure rises excessively, the ratio of the depth of the pressure-balancing grooves 19 to their width should be at least twice the relative proportion of the rib grooves 13.
    This ratio between the depth and width of the pressure balancing grooves may be in the range between 3: 1 and 15: 1, preferably about 1Q :. Practically, tests show that the width of the balancing pressure grooves is 0.1-3 mm, preferably Г mm.
    However, the above ratios and - dimensions may vary according to the dynamic viscosity of the source material used and the standard pressure of this device.
    In order for the protrusions obtained in the places where the pressure balancing grooves 19 are located,
    fewer pressure balancing use of these pipes — grooves 19 are located in close proximity to the rib grooves
    13 and parallel to them. The projections located adjacent to the ribs do not interfere, for example, with the location of the sealing ring around the pipe between the ribs.
    In order to have a sufficient amount of pressure balancing grooves 19 on the forming surface of metal molds and 2 balances, the pressure groove 19 is formed on both sides of each rib groove 13.
    Thus, this solution prevents the formation of
    Q turbidity the flow of material is blocked on the pipes, which improves their quality.
    权利要求:
    Claims (10)
    [1]
    1. A device for the manufacture of plastic ribbed pipes with a smooth inner surface, containing an expander, a rod located along
    Q is the central axis of the extruder and is made in the form of a spindle placed inside the extruder, a conical mandrel protruding from the extruder and connected to a core of constant diameter forming a continuation of the core, and the rod is mounted with a shaft. the formation of a tubular channel with an extruder in communication with the plastic material supply unit, with the extrusion press, surrounding the extruder and the rod, aligned along the process and made in the form of metal molds with grooves along the inner surface for forming fins pipes from
    0
    In order to improve the quality of the pipes, the working volume of the annular cavity bounded by the plane, the transverse center axis of the rod and the extruder passing through the end surface, the mandrel surface and the surface enveloping the core surface is selected corresponding to the total filling volume of those grooves molds of the pressing means, which are located near the mandrel at each individual point in time, with the length of the mandrel chosen to be a multiple of the size
    one hundred between the grooves of the press-form, reduced by one width of the groove.
    [2]
    2. A device according to claim., Characterized in that the difference of said volumes is at most 25%.
    .
    [3]
    3. The device according to PP. 1 and 2, about the same with. the fact that forming the conical part of the mandrel is placed at an angle of 2-30 e, preferably 15 ° relative to the central part of the rod.


    [4]
    4. The device according to PP. 1-3,
    about t
    at the angle between the core of the conical part of the mandrel and the central axis of the rod, it was chosen greater than the beginning of the mandrel with a reduction to its end to form a parabolic surface of the mandrel.
    [5]
    5. The device according to PP. 1-4-, o t -; even so that (on the inner surface of the molds of the pressing means, balancing pressure of the grooves is made with a width smaller than the width of the grooves forming the fins to ensure complete or partial unfilling at ordinary pressure
    12
    material due to its dynamic viscosity.
    [6]
    6. The device according to claim 5, characterized in that the ratio of the depth of the pressure-balancing grooves to their width is chosen at least twice with respect to the corresponding ratio of the grooves, the Lord of the marching ribs.
    [7]
    7. The device according to paragraphs. 5 and 6, which is based on the fact that the ratio of the depth of the pressure-balancing grooves to their width is chosen in limits of 3: L — J5: J, preferably 10: 1.
    [8]
    8. The device according to PP. 5-7, o
    gr t
    (the fact that the width i of the pressure balancing channel is chosen is J3 within 0.3–3 mm, most preferably J mm.
    ,
    [9]
    9. The device according to PP. 5-8, characterized in that the pressure balancing grooves are located at the grooves forming the fins and parallel to them.
    [10]
    10. A device according to Claims 5-9, characterized in that the pressure-balancing grooves are placed on both sides of each groove that forms the ribs.
    1 I I I I I I I I I 1 .1 I I
    i i i i h i m m i i m
    1
    l
    12
    8 11 16 9a 74 99b
    Fig.Z
    Fig 2
    ten
    Figm
    19 73 19
    Z U /
    III
    g 73 t
    5
    73
    Phases. 6
    Compiled by L.Koltsova Editor L.Gratillo Tehred L.SerdyukovaKorrector S, Shevkun
    Order 1461
    Circulation 542
    VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5
    Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101
    Subscription
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    同族专利:
    公开号 | 公开日
    GR890300069T1|1989-09-29|
    NO871106L|1987-09-21|
    CN1006969B|1990-02-28|
    FI861172A|1987-09-21|
    MY100581A|1990-12-15|
    DE3761124D1|1990-01-18|
    DE3632225A1|1987-09-24|
    JPS62230442A|1987-10-09|
    BG48208A3|1990-12-14|
    CA1268615A|1990-05-08|
    PT84506A|1987-04-01|
    IE60194B1|1994-06-15|
    MA20914A1|1987-10-01|
    FI77405C|1989-03-10|
    YU44800B|1991-02-28|
    IE870709L|1987-09-20|
    FI861172A0|1986-03-20|
    EP0237900B1|1989-12-13|
    PH23756A|1989-11-03|
    DK162926B|1991-12-30|
    JPH0568339B2|1993-09-28|
    PL149530B1|1990-02-28|
    IS3208A7|1987-09-21|
    IL81935A|1991-04-15|
    CN87101978A|1987-10-07|
    MX168748B|1993-06-07|
    IN169391B|1991-10-12|
    ZA871980B|1987-11-25|
    NZ219682A|1989-05-29|
    HU206849B|1993-01-28|
    FI77405B|1988-11-30|
    AU593875B2|1990-02-22|
    US4721594A|1988-01-26|
    EP0237900A1|1987-09-23|
    EG18129A|1992-08-30|
    PL264744A1|1988-01-21|
    GR3000382T3|1991-06-07|
    AT48560T|1989-12-15|
    AU7015587A|1987-09-24|
    TR23307A|1989-10-19|
    BR8701240A|1987-12-22|
    IS1471B6|1991-09-24|
    NO871106D0|1987-03-18|
    DD255506A5|1988-04-06|
    DK162926C|1992-05-25|
    PT84506B|1989-11-10|
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    法律状态:
    2007-12-20| REG| Reference to a code of a succession state|Ref country code: RU Ref legal event code: MM4A Effective date: 20060319 |
    优先权:
    申请号 | 申请日 | 专利标题
    FI861172A|FI77405C|1986-03-20|1986-03-20|Method and apparatus for producing cam flange tubes.|
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