• 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:
    Retractable core system (1) for molding parts comprising a central part (7), a set of side parts (9) provided with adjacent molding portions (17), the set of side parts (9) comprising a part first type (9a) lateral valve arranged to cooperate with the central portion (7) in a first direction of oblique cooperation with respect to the central axis (5) between a molding position and a retracted position; the set of lateral parts (9) comprising a lateral part of a second type (9b) arranged to be movable in translation in a second direction of cooperation transverse to the central axis (5).
    公开号:FR3022483A1
    申请号:FR1455663
    申请日:2014-06-19
    公开日:2015-12-25
    发明作者:Scola Philippe Boulette；Frederic Cieslak；Stephane Revaux
    申请人:INFIPLAST；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a system with retractable cores for molding parts, especially the molding of parts by injection of thermoplastic material. It is known to use retractable core systems 5 for removing the cores after molding a part in a mold. The workpiece can then be ejected or removed from the mold. To do this, it is necessary to have a core comprising a plurality of adjacent lateral parts arranged to be moved between a molding position and a retracted position. In order to allow the transition from the molding position to the retracted position, it is also known to move only a portion of all the side portions at first, and then the remainder of the side portions from the molding position to the position retracted. This arrangement is particularly advantageous when the lateral parts 15 extend in a closed contour. Mechanical systems make it possible to carry out such displacements in an offset manner. They are complicated to implement because they require to have parts arranged to be movable relative to each other. Functional clearances must also be provided between the parts of this mechanical system to allow the lateral parts to move. It therefore appears to be difficult to provide both a geometry of the parts of the system allowing precise positioning of the lateral parts in particular in the molding position and secondly to provide functional clearances allowing the shifted displacement of the lateral parts. The present invention aims to solve all or some of the disadvantages mentioned above. To this end, the present invention relates to a system with retractable cores 30 for molding parts, in particular injected parts made of thermoplastic material, comprising a central part. The retractable core system also includes a set of side portions provided with adjoining molding portions arranged to generate a continuous molded pattern on a workpiece about a central axis, the side portions being arranged to be movable between a center position. molding and a position retracted from the central portion and being disposed around the central portion in the molding position. The set of side portions comprises a lateral portion of a first type arranged to cooperate with the central portion in a first direction of oblique cooperation with respect to the central axis between a molding position and a retracted position. The set of side parts comprises a lateral part of a second type arranged to be movable in translation in a second direction of transverse cooperation to the central axis between a molding position and a retracted position. According to one aspect of the invention, the second direction of cooperation is fixed relative to the central part. In other words, the lateral part of the second type moves transversely with respect to the central part but not longitudinally. The second type of lateral portion 15 is therefore always in the same plane transverse to the central portion and can move along the central axis with the central portion. Also, the lateral part of the first type has only one degree of freedom in its movements relative to the central part. According to one aspect of the invention, the central portion is arranged to be movable along the central axis between a molding position and a retracted position. Preferably, the lateral portion of the first type is arranged to cooperate in a surface manner with the central portion in the first direction of cooperation. According to one aspect of the invention, the first direction of cooperation 25 is oriented such that when the central portion is moved from the molding position to the retracted position, the first type side portion moves transversely to the central axis preferably in the direction of the central axis. These arrangements thus make it possible by simple displacements, that is to say translations relative to the central part, to the lateral parts to pass from their molding positions to their retracted positions. The simplicity of these displacements has the advantage of allowing reliable operation of the core system, the mechanical arrangements between the parts also remaining simple. This simplicity also implies weak functional play between the parts. This is a guarantee of precision of the displacements between the retracted positions and the molding positions and makes it possible to reach a large number of displacements before it is necessary to change a used part. In this text reference is made to molding positions and retracted positions. The molding and retracted position of each part is defined with respect to another part except for the central part. Thus a part may be in the molding position and another part in the retracted position. The molding of the part by the retractable core system is performed when all the parts are in the molding position.
    [0002] According to one aspect of the invention, the retractable core system further comprises a lateral guide device of the second type provided with a displacement element arranged to move between the retracted position and the molding position the lateral portion of the invention. second type. According to one aspect of the invention, the guiding device further comprises an adjustment member provided with a wedging portion arranged to be disposed between the central portion and the second type lateral portion and arranged to be in contact with the second type lateral part, when the second type central and lateral parts are both in the molding position. The wedging portion thus makes it possible, by contact, to maintain at a determined position the lateral part of the second type. The interest is to allow an alignment of the adjoining molding portions so that the continuous molded pattern does not have an irregularity at the joint between two adjacent molding portions. According to one aspect of the invention, the displacement element and the adjustment element are arranged to be translated along the central axis between a retracted position and a molding position, the transition from the retracted position to the position. molding of the adjustment and displacement elements causing the displacement of the second-type lateral portion from the retracted position to the molding position, and the transition from the molding position to the retracted position of the adjustment and displacement causing displacement of the second-type lateral portion from the molding position to the retracted position. The displacement of the second type lateral portion by the displacement member and the adjustment of its position in the molding position by the adjusting member is accomplished by a simple translation of the displacement and adjustment elements. . This arrangement thus makes it possible to carry out two operations, displacement and adjustment, from a single translational movement. This simple arrangement between the components of the retractable core system implies a precision of the displacements of the second type lateral part. According to one aspect of the invention, the wedging portion has a first contact surface arranged to cooperate surface with the second type side portion when the second type side portion moves between the molding position and an intermediate position. the intermediate position of the second type lateral part lying between the molding position and the retracted position in the second direction of cooperation.
    [0003] Preferably, the first contact surface has an inclination with respect to the central axis. In particular, the lateral portion of the second type has a first cooperation surface arranged to cooperate in a surface manner with the first contact surface of the adjustment element.
    [0004] This surface cooperation, due to the inclination of the surfaces, allows a displacement of the lateral part of the second type in the second direction of cooperation. According to one aspect of the invention, the wedging portion has a second contact surface arranged to cooperate in a surface manner with the central portion when the second type side portion moves between the molding position and the intermediate position. Preferably, the second contact surface has an inclination with respect to the central axis. In particular, the central portion has a second engagement surface arranged to cooperate surface with the second contact surface of the adjustment member. When the central portion and the lateral portion of the second type are in the molding position, the wedging portion is then in surface contact with the central portion and the lateral portion of the second type. The wedging portion is thus arranged to adjust the positioning of the lateral portion of the second type in the molding position by wedging relative to the central portion. According to one aspect of the invention, the adjoining molding portions are arranged to generate a continuous molded pattern on a closed contour when the set of side portions and the central portion are in the molding position. The retractable core system thus retracts adjoining molding portions forming a closed contour around the central axis. Preferably the contour extends transversely to the central axis. The fact of having a lateral part of the first type and a lateral part of the second type makes it possible to retract these parts independently and thus to retract all of the lateral parts even though the molding portions form a closed contour. According to one aspect of the invention, the adjoining molding portions have at least one rib and / or at least one groove when the set of side portions and the central portion are in the molding position. According to one aspect of the invention, the at least one rib and / or the at least one groove extend transversely to the central axis. According to one aspect of the invention, the at least one rib and / or the at least one groove are arranged to form a thread about the central axis when the set of side portions and the central portion are in position. molding. Since the first-type lateral portion and the second-type lateral portion are arranged to retract transversely to the central axis, relief patterns extending transversely to the central axis may be generated on the molded part, particularly a thread. . According to one aspect of the invention, the retractable core system comprises a mold provided with a first part in which are arranged the central part and all the lateral parts, and, a second part in which the device is arranged. guidance. According to one aspect of the invention, the first part is a moving part while the second part is a fixed part. It thus appears that the displacement and adjustment elements are both arranged on the fixed part of the mold, which allows them to be secured and fixed during the movement of the movable part. According to one aspect of the invention, the first portion and the second portion of the mold are arranged to be displaced relative to each other between a retracted position and a molding position along the central axis. According to one aspect of the invention, the central portion is arranged to be displaced along the central axis relative to the second portion of the movable portion as it moves between the retracted position and the molding position. This arrangement allows the transverse displacement with respect to the central axis of the first-type lateral portion as it moves between the molding position and the retracted position. According to one aspect of the invention, the set of lateral parts consists of an alternation of first-type lateral parts and second-type lateral parts. Preferably, each lateral portion is facing a lateral portion of the same type with respect to the central axis. This arrangement makes it possible to have a retractable core of symmetrical shape. According to one aspect of the invention, when all the parts of the retractable core system are in the molding position, the system is able to perform the molding of a part. Following molding, the movable portion is moved from the molding position to the retracted position. This has the effect, through the elements of displacement and adjustment, to move the lateral parts of the second type towards the central axis in the second direction of cooperation. The lateral parts of the second type are thus in the retracted position. The central portion is then moved from the molding position to the retracted position along the central axis relative to the second portion of the movable portion. Thanks to the surface cooperation between the central part and the first type lateral parts, this displacement of the central part has the effect of moving the first type of lateral parts transversely to the central axis and to the central axis.
    [0005] Preferably, this displacement transverse to the central axis is in the plane transverse to the central axis defined by the second respective directions of cooperation of the lateral parts of the second type. The displacement of the central portion also has the effect of moving along the central axis, the assembly consisting of the central portion and the second type of side portions of the molded part. The second type side parts and the first type side parts are thus offset along the central axis. The set of side parts is then in the retracted position and the molded part can be removed from the moving part. In any case, the invention will be better understood with the aid of the description which follows with reference to the appended diagrammatic drawings showing, by way of non-limiting example, one embodiment of this retractable core system. Figure 1 is a perspective view of the fixed part of the mold. Figure 2 is a perspective view of the movable portion of the mold. Figure 3 is an exploded perspective view of a retractable core system. Figure 4 is a perspective view of a retractable core system at a molding position. Figure 5 is a longitudinal section with respect to a central axis of the retractable core system in the molding position. Figure 6 is a longitudinal section, in a plane perpendicular to that of Figure 5, of the retractable ring system in the molding position. Figure 7 to 10 are longitudinal sections of the retractable core system, according to the same sectional planes as Figures 5 and 6, at different stages of retraction. As illustrated in FIGS. 1 and 2, a retractable core system 1 comprises a mold 3 provided with a movable portion 3a and a fixed portion 3b. The mobile part 3a and the fixed part 3b are arranged to move in translation relative to each other along a central axis 5.
    [0006] The retractable core system 1 comprises a central portion 7 and a set of side portions 9 disposed in the movable portion 3a of the mold. The central axis 5 corresponds to the direction of extension of the central portion 7. As illustrated in FIGS. 3 to 6, the retractable core system 1 comprises a guiding device 11 provided with a displacement element 13 and an adjustment element 15. The displacement elements 13 and adjustment 15 are managed in the fixed part of the mold 3b. Thus the displacement elements 13 and adjustment 15 are integral with the fixed part 3b and are arranged to be displaced in translation with the fixed part 3b along the central axis 5.
    [0007] The lateral portions 9 are arranged around the central portion 7 relative to the central axis 5. Each lateral portion 9 further comprises a molding portion 17. The molding portions 17 are adjacent in pairs and arranged to generate a continuous molded pattern. The molding portions 17 are distributed around the central axis 5 so as to extend in a transverse contour to the central axis 5. The molding portions 17 also have ribs 17a and tenons 17b arranged so as to generating an internal thread on a molded part in the retractable core system 1. The set of side portions 9 consists of side portions 20 of a first type 9a and side portions of a second type 9b arranged alternately around of the central axis 5. Each lateral part 9 of a type is facing a lateral part of identical type, with respect to the central axis 5. Each lateral part of the first type 9a cooperates in a surface manner with the central portion 7 in a first direction of cooperation 19 oblique with respect to the central axis 5. The cooperation between the central portion 7 and the first type of side portions 9a is performed by a first system to dovetail 21. The first dovetail system 21 comprises a groove 21a formed in the first-type lateral portion and a pin 21b disposed on the central portion 7. Each second-type lateral portion 9b is arranged to be displaced in translation relative to the central portion 7 in a second direction of cooperation 23 transverse to the central axis 5.
    [0008] The cooperation between the central portion 7 and the second type side portions 9b is effected by a second dovetail system 25. The second dovetail system 25 comprises a groove 25a in the side portion of the second type 9b and a peg 25b disposed on the central portion 7. In Figures 5 and 6, the first type side portions 9a and the second type side portions 9b are each disposed in a molding position. The first type 9a and second type 9b side portions are arranged to be moved to a retracted position as will be explained later with reference to FIGS. 7 to 10. The guide device 11 is arranged to move and hold in the molding position the side parts of second type 9b. In Figure 5 is shown the molding position of the second type side portions 9b. The adjusting member 15 includes a wedging portion 27 disposed between the central portion 7 and the second type side portion 9b when the second type side portion 9b is in the molding position.
    [0009] The wedging portion 27 comprises a first contact surface 27a arranged to cooperate in a surface manner with a first cooperation surface 29a of the second type lateral portion 9b. The wedging portion 27 also comprises a second contact surface 27b arranged to be in contact with a second cooperation surface 29b of the central portion 7. We have presented above the different elements of the retractable core system 1 and the arrangement of the parts relative to each other. We will now detail, with reference to FIGS. 7 to 10, the displacements of the various components of the system from the molding of a part until the removal of the cores, by means of cores: together constituted by the central part 7 and the parts 9. In the present text, each element of the retractable core system 1 is defined relative to the others in two positions: the retracted position and the molding position of said element. When all the elements 30 are in the molding position, it is said that the retractable core system 1 is in the molding position. In Figure 7, the retractable core system is in the molding position. A part 31 can therefore be injected. The first part 3a and the second part 3b of the mold are in contact.
    [0010] In FIG. 8, this is the first retraction step: the first part 3a and the second part 3b of the mold are displaced relative to each other along the central axis 5. During this step the first type side portions 9a remain stationary. On the contrary, the lateral parts of the second type 9b are displaced under the effect of the guiding device 11. During this step, the displacement element 13 causes a movement of the lateral parts of the second type 9b towards the central part 7 because the displacement element 13 extends obliquely with respect to the central axis 5. The second-type side parts 9b are thus no longer in contact with the molded part 31. At the moment when the contact between the elements of FIG. displacement 13 and the second type side portions 9b ceases, the second type side portions 9b are in the retracted position. The position of the lateral portions 15 of the second type 9b with respect to the central part 7 remains unchanged until the end of the retraction of the core, which corresponds to FIGS. 8 to 11. In FIG. 9, the first part of the mold 3a and the second part of the mold 3b are in retracted position: their distance is maximum. The relative position of the first part 3a and the second part 3b of the mold 20 remains unchanged until the end of the retraction of the core. In FIG. 10, the central part 7 is displaced with respect to the first part of the mold 3a between its molding position, as illustrated in FIGS. 7 to 9, and its retracted position, as illustrated in FIGS. 10 and 11. The central portion 7 and the lateral portions of first type 9a 25 interacting in a surface manner, the displacement of the central portion 7 causes an offset in the first direction of cooperation 19 between these two elements. The first direction of cooperation 19 being oblique with respect to the central axis 5, the displacement of the central portion 7 has the effect of moving transversely to the central axis 5 the first type of side portions 9b, as shown in FIG. 10. The molded part 31 is thus no longer in contact with any molding portion 17. In FIG. 11, the central portion 7 is further moved along the central axis 5 to reach its retracted position. During this step the surface cooperation between the central portion 7 and the first type side portions 9a is blocked, for example by a stop preventing slippage between the central portion 7 and the first type side portions 9a. The first type of side portions 9a thus has their maximum offset with respect to the central portion 7: they are in the retracted position. The surface cooperation having ceased, the lateral parts of the first type 9a are thus displaced with the central portion 7 along the central axis 5. It thus appears in FIG. 10 that all the elements of the retractable core system 1 are in retracted position: the system with 10 retractable cores 1 is in the retracted position. The molded part 31, supported by a portion of the first portion of the mold 3a can be removed. In order to carry out the following molding, the preceding steps can be carried out in the reverse order so that the retractable core system 1 returns to its molding position. This retractable core system 1 thus has elements arranged to be moved successively and in turn. This moves from the molding position to the retracted position. The guiding device 11 taking advantage of the displacement of the moving part of the mold to move the lateral parts of the second type 9b and the displacement of the central part 7 causing the displacement of the first-type lateral parts 9a, it appears that only the parts of the mold 3 must be moved relative to each other and the central portion 7 relative to the movable portion of the mold 3a to retract the core.
    [0011] Since these displacements are generally carried out by hydraulic cylinders, it appears from the known retraction systems that the number of necessary cylinders has been reduced. This has the effect of freeing space inside the mold, the cylinders are usually arranged there. The space freed allows for example to more effectively arrange a cooling system inside the mold. It may be for example by a circulation circuit of a cooling fluid. In addition, the use of a limited number of jacks reduces the risk of breakdowns and breakage of elements of the retractable core system 1. In effect, the controls to be performed on the system are limited and the parts to be changed for maintenance too.
    [0012] As goes without saying, the invention is not limited to the sole embodiment of this retractable core system, described above as an example, it encompasses all the variants.
    权利要求:
    Claims (14)
    [0001]
    REVENDICATIONS1. Retractable core system (1) for molding parts (31), in particular thermoplastic injected parts, comprising: - a central part (7), - a set of lateral parts (9) provided with molding portions ( 17) arranged to generate a continuous molded pattern on a workpiece (31) about a central axis (5), the side portions (9) being arranged to be movable between a molding position and a retracted position with respect to the central part (7) and being arranged around the central part (7) in the molding position, the set of lateral parts (9) comprising a lateral part of a first type (9a) arranged to cooperate with the central part (7) in a first direction of cooperation (19) oblique to the central axis (5) between a molding position and a retracted position; the set of lateral parts (9) comprising a lateral part of a second type (9b) arranged to be movable in translation along a second direction of cooperation (23) transverse to the central axis (5) between a position of molding and a retracted position.
    [0002]
    2. retractable core system (1) according to claim 1, wherein the central portion (7) is arranged to be movable along the central axis (5) between a molding position and a retracted position. 25
    [0003]
    3. Retractable core system (1) according to one of the preceding claims, wherein the first type of lateral portion (9a) is arranged to cooperate in a surface manner with the central portion (7) in the first direction of cooperation (19). ). 30
    [0004]
    4. retractable core system (1) according to one of the preceding claims, further comprising a guide device (11) of the second type of lateral portion (9b) provided with a displacement element (13) arranged to move between the retracted position and the molding position the second type lateral portion (9b). 3022483 14
    [0005]
    5. Retractable core system (1) according to the preceding claim, wherein the guide device (11) further comprises an adjustment element (15) provided with a wedging portion (27) arranged to be arranged between the central portion (7) and the lateral portion of second type (9b) and arranged to be in contact with the second type lateral portion (9b), when the central (7) and lateral second type (9b) portions are both in molding position.
    [0006]
    6. retractable core system (1) according to the preceding claim, wherein the displacement element (13) and the adjustment element (15) are arranged to be translated along the central axis (15) between a position retracted and a molding position, the transition from the retracted position to the molding position of the adjustment (15) and displacement (13) elements causing the displacement of the second type lateral portion (9b) from the retracted position to the molding position, and, the transition from the molding position to the retracted position of the adjustment (15) and displacement (13) elements causing the displacement of the second-type lateral portion (9b) from the molding position to the retracted position.
    [0007]
    7. retractable core system (1) according to one of claims 5 or 6, wherein the wedging portion (27) has a first contact surface (27a) arranged to cooperate in a surface manner with the lateral part of the second type (9b) when the second type side portion (9b) moves between the molding position and an intermediate position, the intermediate position of the second type side portion (9b) lying between the molding position and the retracted position according to the second direction of cooperation (23).
    [0008]
    8. retractable core system (1) according to the preceding claim, wherein the wedging portion (27) has a second contact surface (27b) arranged to cooperate in a surface manner with the central portion (7) when the lateral portion of second type (9b) moves between the molding position and the intermediate position.
    [0009]
    The retractable core system (1) according to one of the preceding claims, wherein the adjacent molding portions (17) are arranged to generate a continuous molded pattern on a closed contour when the set of side portions (9 ) and the central portion (7) are in the molding position.
    [0010]
    10. Retractable core system (1) according to one of the preceding claims, wherein the adjacent molding portions (17) have at least one rib (17a) and / or at least one groove (17b) when the set of side parts (9) and the central part (7) are in the molding position. 10
    [0011]
    11. System with retractable cores (1) according to the preceding claim, wherein the at least one rib (17a) and / or the at least one groove (17b) extend transversely to the central axis (5). 15
    [0012]
    12. System with retractable cores (1) according to the preceding claim, wherein the at least one rib (17a) and / or the at least one groove (17b) are arranged to form a thread around the central axis ( 5) when the set of side portions (9) and the central portion (7) are in the molding position. 20
    [0013]
    Retractable core system (1) according to claim 4 or one of claims 5 to 12 in combination of claim 4, comprising a mold (3) provided with a first portion (3a) in which the central portion (7) and all of the side portions (9), and a second portion (3b) in which the guide means (11) is arranged.
    [0014]
    The retractable core system (1) according to claim 13, wherein the first portion (3a) is a movable portion while the second portion (3b) is a fixed portion. 30
    类似技术:
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    同族专利:
    公开号 | 公开日
    FR3022483B1|2017-01-20|
    EP2957410A1|2015-12-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FR905388A|1940-01-19|1945-12-03|Contractable punch for molding and the like|
    FR1446103A|1965-09-02|1966-07-15|Method and apparatus for shaping a molded article|
    FR2407061A1|1977-10-28|1979-05-25|Geyer & Co|Sliding sleeve insert pins for injection moulding undercut profiles - suitable for disengaging small diameter recesses|
    GB2135236A|1983-02-16|1984-08-30|Daiichi Geyer Kk|Collapsible cores|
    JPH05261776A|1992-03-17|1993-10-12|Olympus Optical Co Ltd|Mold for cylindrical material provided with bore undercut|
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    WO2011019267A1|2009-08-13|2011-02-17|Wang Han Yap|An internal undercut core for forming an internal undercut in an article in injection moulding|
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    CN111347625B|2020-03-25|2021-09-28|佛山市优坐家具有限公司|Injection molding part mold with internal threads and demolding method thereof|
    法律状态:
    2015-05-18| PLFP| Fee payment|Year of fee payment: 2 |
    2015-12-25| PLSC| Search report ready|Effective date: 20151225 |
    2016-05-12| PLFP| Fee payment|Year of fee payment: 3 |
    2017-05-24| PLFP| Fee payment|Year of fee payment: 4 |
    2018-03-29| PLFP| Fee payment|Year of fee payment: 5 |
    2020-05-14| PLFP| Fee payment|Year of fee payment: 7 |
    2021-04-16| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1455663A|FR3022483B1|2014-06-19|2014-06-19|RETRACTABLE CORE SYSTEM FOR MOLDING WORKPIECES|FR1455663A| FR3022483B1|2014-06-19|2014-06-19|RETRACTABLE CORE SYSTEM FOR MOLDING WORKPIECES|
    EP15172910.0A| EP2957410A1|2014-06-19|2015-06-19|Retractable ring system for moulding parts|
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