• 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 ejection device comprises: - a thrust device (14) movable in translation along a first axis (A1) between a retracted position and an ejection position, - an ejection element (28) movable in translation according to a second axis (A2) between a retracted position and an ejection position; - a transfer device (26) connecting the pusher (14) and the ejection element (28). The transfer device (26) comprises at least two links (44) movable in translation relative to one another and relative to the thrust device (14) and the ejection element (28).
    公开号:FR3048197A1
    申请号:FR1651639
    申请日:2016-02-26
    公开日:2017-09-01
    发明作者:Sylvain Belliard
    申请人:Faurecia Interieur Industrie SAS；
    IPC主号:
    专利说明:

    Ejection device for a mold comprising a chain of sliding links
    The present invention relates to a mold type ejection device for producing an article molded in a molding cavity for allowing ejection of the molded article from said molding cavity, said device comprising: - a device thrust movable in translation along a first axis between a retracted position and an ejection position, - at least one ejection element movable in translation along a second axis, different from the first axis, between a retracted position and a position of ejection, - at least one transfer device connecting the thrust device and the ejection element, said transfer device being arranged to move the ejection element along the second axis between its retracted position and its ejection position when the thrust device is moved along the first axis between its retracted position and its ejection position.
    In a mold for producing a molded part, such as an injection mold, the molded part is removed from the mold, for example by means of a gripping tool, when the mold cavity is open. To facilitate this removal, it is intended to separate the molded part of the mold part on which the molded part rests by means of an ejection device.
    Such an ejection device generally comprises an ejection plate, movable in a recessed space of the mold part in a direction corresponding to the ejection direction of the part, and one or more ejection rods integral with the plate. ejection and opening into the wall of the portion of the mold against which the molded part is applied. By moving the ejection plate in the ejection direction, the ejector rods push the molded part away from the wall of the mold part, allowing subsequent removal of the molded part. The use of several rods is particularly advantageous when the molded part has a large surface because these rods can be distributed on this surface in order to push the piece into different parts thereof and avoid deformation and or breakage of the piece at during his ejection. The use of an ejection plate makes it possible to simultaneously move all the rods by means of a single device for actuating the ejection plate
    However, in such an ejection device, the rods are movable only in a single ejection direction, which limits the possibilities of ejection strokes. Such a limitation can be problematic for parts having complex shapes, for example when these parts are not flat and have areas extending in one or more different planes of a plane perpendicular to the direction of ejection or when they comprise elements projecting in a direction different from the direction of ejection.
    In addition, for parts having complex shapes, such as a part undercontrol, the simple ejection of the piece out of the mold does not allow to unmold the part underdepouille. To unmold this part, it is known to use a movable drawer in the molding cavity between a molding position, in which the drawer defines with the molding cavity the shape of the area against undercut, and a retracted position, in wherein the drawer is removed from the area against undercut and allows the ejection of the part out of the mold cavity. The ejection of such a part therefore requires an actuating operation of the drawer and an ejection operation of the part, which increases the cycle time of the mold and makes the structure of the mold more complex. One of the aims of the invention is to overcome these drawbacks by proposing an ejection device offering a greater freedom of layout while being less bulky and also allowing the removal of a drawer from a counter zone. -deep during the ejection of the room. To this end, the invention relates to an ejection device of the aforementioned type, wherein the transfer device comprises at least two links movable in translation relative to each other and relative to the thrust device and to the ejection element.
    The transfer device makes it possible to modify the direction of ejection of the ejection element by choosing a second axis inclined with respect to the first axis. Thus, by way of example, the ejection device may comprise an ejection rod ejecting the workpiece along the first axis and another ejection rod forming the ejection element and ejecting the workpiece along the second axis, which makes it possible to eject pieces of complex shape. Further, by providing a molding surface at the end of the ejection element, for example to form an undercut portion on the molded article, this molding surface can be disengaged from the undercut portion at the during the movement of the second rod between its retracted position and its ejection position. Thus, actuation of the ejection device further allows to demold a portion of the molded article.
    According to other characteristics of the ejection device according to the invention: the transfer device comprises a guide element receiving said links, said links being moved in a displacement path in said guide element by the thrust device and moving the ejection element, said links being guided in said guide element over the entire travel path; the guide element comprises at least two opposite walls each extending along the displacement path; the links each comprise two opposite guide surfaces, said guide surfaces being respectively in permanent contact with an opposite wall of the guide element over the entire displacement path so that the links are guided in said guide element over any the running race; the links are identical to each other; the second axis forms a non-zero angle with the first axis; each link comprises a first sliding surface forming a translation surface with a first adjacent link and a second sliding surface forming a translation surface with a second adjacent link; each sliding surface forms an angle with respect to a direction perpendicular to the first axis, said angle being negative to delay the movement of the ejection element relative to the thrust or positive device in order to accelerate the displacement of the element; ejection with respect to the thrust device or zero to move the ejection element and the thrust device at the same speed; the ejection element comprises a secondary molding surface arranged to form a portion of the molding cavity and for molding a portion of the molded article, moving the ejection element into the ejection-causing position; separating the secondary molding surface from the portion of the molded article molded by said secondary molding surface; and - the thrust device comprises an ejection plate movable in translation in a direction parallel to the first axis, said ejection device further comprising an ejection rod integral with the ejection plate and arranged to move the article molded in said direction parallel to the first axis. The invention also relates to a mold comprising a first mold part and a second mold part movable relative to each other between an open position, in which the second mold part is spaced from the first mold part, and a closed position, in which the first and second mold parts define between them a mold cavity having the shape of the molding, said mold comprising an ejection device as described above integrated in the first part. of mold, the ejection element forming part of the mold cavity in the retracted position and projecting from the first mold part along the second axis in the ejection position. Other aspects and advantages of the invention will appear on reading the description which follows, given by way of example and with reference to the appended drawings, in which: FIG. 1 is a schematic perspective view of a first mold part comprising an ejection device according to an embodiment of the invention, said device being in the retracted position, FIG. 2 is a schematic sectional representation of the first mold portion of FIG. 1, - FIG. 3 is a schematic sectional representation of the first mold portion of FIG. 2, the ejection device being in an intermediate position between the retracted position and the ejection position; FIG. 4 is a schematic sectional representation of the first mold portion of FIG. 2, the ejection device being in the ejection position, - FIG. 5 is a diagrammatic perspective and exploded representation of the ejection device according to one embodiment of the invention; FIG. 6 is a schematic representation of a portion of the ejection device of FIG. 5, and - Figs. 7 and 9 are diagrammatic perspective representations of links according to different embodiments of the ejection device according to the invention; 8 and 10 are diagrammatic representations in perspective of the assembly of the links respectively shown in FIGS. 7 and 9, and FIGS. 11 to 15 are diagrammatic representations in section of the first mold part, the ejection device being in the retracted position, and showing different displacement strokes of the ejection device, and
    With reference to FIG. 1, there is described an embodiment mold 1 of a molded article 2 which may have any shape that can be molded. Such an embodiment mold 1 is for example an injection mold, a compression mold, a foaming mold or the like. More generally, a mold makes it possible to impart a desired shape to a material placed in a molding cavity having the desired shape. The molded article 2 is for example a part of a motor vehicle or other. More particularly, according to the embodiment shown in the figures, the molded article 2 comprises a main surface 4 and an undercut portion 6 with respect to the main surface, that is to say a part comprising at least a non-demoldable surface by simply spacing two mold parts and requiring a complementary molding element and movable in a direction different from the direction of separation of the two mold parts.
    The embodiment mold 1 comprises a first part 8 and a second part (not shown to simplify the figures), movable relative to each other between an open position, in which the first and second parts are spaced apart. on the other side, and a closed position, in which the first and second parts are brought closer to each other so as to define a closed main molding cavity. The main molding cavity has a shape complementary to the main surface 4 of the molded article to be produced. The movement of the closed position to the open position is in a direction of opening D, shown in the figures. The first part comprises a molding surface 10 defining, with a molding surface of the second part, the main molding cavity when the first and second parts are in the closed position.
    The main surface 4 is such that it can be separated from the molding surface 10 by a displacement of the molded article 2 in a single ejection direction, for example parallel to the opening direction D. Therefore, the main surface 4 is not necessarily flat and may have any shape allowing demolding by displacement of the molded article 2 in the direction of ejection. Thus, according to the embodiment shown in the figures, the main surface 4 comprises a first part 5 substantially perpendicular to the opening direction D and a second part 7 inclined with respect to the first part 5. It should be noted that the main molding cavity could also be arranged to form elements projecting from the main surface 4, for example ribs, as long as these elements can also be separated from the main molding cavity by a displacement of the molded article 2 according to the direction of ejection.
    According to the embodiment shown in the figures, the main molding cavity is in fluid communication with a secondary molding cavity defined by the molding surface 10 of the first part and a complementary molding surface 12 carried by the ejection device of the invention, as will be described later. The complementary molding cavity has a shape complementary to the undercut portion 6 of the molded article. The main molding cavity and the complementary molding cavity together form the molding cavity of the embodiment mold 1.
    The embodiment mold 1 is for example an injection mold arranged to inject a plastic material at a predetermined pressure into the mold cavity. For this purpose, the embodiment mold 1 comprises all the means making it possible to carry out and control this injection and the formation of the part, such as one or more nozzles for injecting the plastic material, means for regulating the temperature of the molding cavity, means for actuating and moving the first and second parts of the production mold 1, etc. Such means being known, they will not be described in more detail here.
    The embodiment mold 1 comprises an ejection device arranged to facilitate removal of the molded article 2 of the production mold 1 after its production. Once the molded article 2 is made, the first and second mold parts are moved to the open position. The molded article 2 is then against the molding surface 10 of the first portion 8, as shown in FIGS. 1 and 2, and the ejection device is arranged to move the molded article 2 away from the molding surface 10, as shown in FIG. 4, in order to allow the gripping of the molded article 2 to take it out of the production mold. It should be noted that the ejection device can be actuated during the opening of the mold 1 so that the ejection of the molded article 2 does not necessarily begin while the mold is already in the open position.
    The ejection device comprises a thrust device 14 movable in the first part 8 along a first axis A1 between a retracted position, shown in Figs. 1 and 2, and an ejection position, shown in FIG. 4. The first axis A1 extends in the direction of ejection and is for example substantially parallel to the opening direction D so that, in the ejection position, the molded article 2 is spaced from the molding surface 10 in the space between the first part 4 and the second part of the mold.
    The thrust device 14 comprises at least one ejection plate 16 arranged, movable in translation along the first axis A1, in a space 18 of the first part 8. In the retracted position, the ejection plate 16 is arranged in an upstream portion 20 of the space 18, i.e. the part of the space 18 farthest from the molding surface 10, and in the ejection position, the ejection plate 16 is disposed in a downstream part 22 of the space 18, that is to say the part of the space 18 closest to the molding surface 10.
    The thrust device 14 further comprises an actuating element 24 integral in displacement of the ejection plate 16. The actuating element 24 is connected to a transfer device 26 which is itself connected to an ejection element 28. The ejection element 28 is movable along a second axis A2, different from the first axis A1. According to the embodiment shown in the figures, the ejection element 28 is a movable block carrying the complementary molding surface 12. Thus, in the retracted position, the block is disposed in the first part so that the molding surface complementary 12 extends opposite the molding surface 10 of the first portion and defines therewith the complementary molding cavity. The ejection element 28 further comprises an actuating end 30. The ejection element 28 further comprises an actuating rod 31 connected by its downstream end to the actuating end 30 of the block mobile and extending along the second axis A2. The upstream end of the actuating rod 31 is connected to the transfer device 26, as will be described later. It should be noted that the actuating rod 31 could be made in one piece with the moving block. However, providing a movable block and an actuating rod 31 formed of two separate parts improves the adaptability of the ejection element 28 to different molds, as will be described later.
    The second axis A2 forms an angle with the first axis A1. The value of the angle a is chosen according to the shape of the molded article. More particularly, in the case where the molded article comprises an undercut area 6, the angle a depends on the distance required to remove the movable block from the undercut area 6 during the ejection of the undercut area 6. molded article 2, as will be described later.
    Thus, the ejection element 28 is movable between a retracted position and an ejection position respectively when the thrust device 14 is in the retracted position and in the ejection position via the transfer device 26 which is arranged to transform the movement of the thrust device 14 along the first axis A1 in motion of the ejection element 28 along the second axis A2, as will now be described.
    The transfer device 26 comprises a guide element 33 extending in the first part 4 of the mold from the space 18 to the molding surface 10 along a path extending along the first axis A1 in the space 18 and according to the second axis A2 in the part of the first mold part 4 extending between the space 18 and the molding surface 10. The guide element 33 comprises a first section 32, for example formed by two first sections 34, extending in the space 14 along the first axis A1 and defining, for example between the first two sections 34, a first groove or guide slide 36, as shown in FIG. 5. The guiding element 33 also comprises a second section 38, for example formed by two second sections 40, extending in the first part 4 between the space 18 and the molding surface 10 along the second axis A2 and defining , for example between the two second profiles 40, a second groove, or guide slide, 42, as shown in FIG. 5. The guide grooves 36, 42 are defined by at least two opposite walls of the sections 34, 40. These opposite walls extend along the first axis A1 for the first section 32 and the second section A2 for the second section 38, that is to say that the opposite walls extend according to the stroke of movement of the links, as will be described later. The guide element 33 is fixed relative to the first mold part 4.
    It should be noted that the ejection plate 16 is movable in translation relative to the first section 32. For this purpose, the ejection plate 16 comprises a cavity 43 arranged to receive the first two profiles 34 of the first section 32. impression 43 is able to slide around the first section 32, which makes it possible to move the ejection plate 16 between its retracted position and its ejection position, as will be described later.
    The transfer device further comprises at least two links 44 connected to each other and one of which is connected to the thrust device 14 and the other of which is connected to the ejection element 28. The links 44 are movable in translation relative to each other and relative to the thrust device 14 and to the ejection element 28. The translation of the links 44 between them is made according to sliding surfaces 46 and relative to the thrust device 14 and the ejection element 28, the sliding surfaces 46 being substantially parallel to each other. Thus, each link 44 comprises a first sliding surface 46 forming a translation surface with a first adjacent link 44 and a second sliding surface 46 forming a translation surface with a second adjacent link 44. The length of the sliding surfaces 46 is such that the links 44 do not disengage from each other when moving the ejection device between its retracted position and its ejection position. In addition, these sliding surfaces 46 are sufficient to be able to transmit the thrust forces of the ejection plate 16 to the ejection element 28.
    Each guide surface 46 forms an angle β with a direction perpendicular to the first axis A1, as shown in FIGS. 11 to 15 Adjusting the angle β relative to the first axis A1 makes it possible to adjust the advance or the displacement delay of the ejection element 28 with respect to the displacement of the thrust device 14, as will be described later. .
    The number of links 44 of the transfer device 26 depends on the path followed by the links 44 in the guide element 30 and is arranged so that the links connect the thrust device 14 to the ejection element 28. More particularly, the links 44 connect an actuating link 48 secured to the ejection plate 16 at the upstream end of the actuating rod 31.
    The actuating link 48 is formed of a first and a second sub-link 50 and 52. The first sub-link 50 is integral in translation with the ejection plate 16 and is movable in translation along the first axis. A1. The second sub-link 52 is articulated to the first sub-link 50 and comprises a guide surface 46 intended to be connected to a link 44 of the transfer device 26, as shown in FIGS. 5 and 6. The second sub-link 52 is thus rotatable relative to the first sub-link 50 about an axis substantially perpendicular to the plane containing the first axis A1 and the second axis A2.
    The transfer device 26 may comprise more than two links 44, including two end links respectively connected to the actuating link 48 secured to the ejection plate 16 and to the upstream end of the actuating rod 31, and at least one intermediate link connected to the two end links or several intermediate links successively connected to each other so as to form a chain of links 44 extending in the guide element 30 between the actuating link 48 and the actuating rod 31.
    All the links 44 are identical, that is to say that they have the same shape and structure, whether they are end links or intermediate links.
    Several forms of links 44 can be envisaged, as will be described later. However, these forms are adapted to cooperate with each other and with the guide element 30 over the entire travel of the links 44 so that the links 44 are guided in the guide member 30 over the entire travel path. For this purpose, each link 44 comprises at least one guide surface 54 arranged to cooperate with the first guide groove 36 and with the second guide groove 42 over the entire stroke of movement of the links. By "cooperating" is meant that the guide surface 54 is in sliding, sliding and / or rolling contact with one of the guide grooves 36 and 42 over the entire displacement path of the link 44 carrying this guide surface 54. Thus, when the link 44 is in the first section 32 of the guide element, the guide surface 54 is in contact with at least one surface of the first guide groove 36 and when the link 44 is in the second section 38, the guide surface 54 is in contact with at least one surface of the second guide groove 42. According to the embodiment shown in Figs. 1 to 6, the guide surface 54 is formed by a roller 56 having a diameter substantially equal to the width of the guide grooves 36 and 42. The cylindrical peripheral surface of the roller 56 forms the guiding surface in sliding contact. with the walls of one of the guide grooves 36, 42 in at least two points of the surface. According to the embodiment shown in the figures, each link 44 comprises two rollers 56 arranged to cooperate respectively with one of the profiles 34, 40, forming the first section 32 and the second section 38. According to one embodiment, the rollers 56 are further rotatable relative to the links, so that the guide surface 54 can also roll on the walls of the guide grooves 36 and 42. Thus, the guide of the links 44 in the guide member 30 is ensured. in an effective manner, which avoids any risk of blocking or jamming of the ejection device by locking a link 44 in the guide member 30. It should be noted that the guide surface 54 could be defined directly by the shape of the link 44 without requiring the addition of a roller, this shape can be arranged to define a sliding contact with the guide element. According to one embodiment, each link 44 comprises two opposite guide surfaces 54 arranged to be in permanent contact with the opposite walls defining the guide grooves 36, 42 of the guide element 30.
    To ensure the translational movement of the links relative to each other, with respect to the actuating link 48 integral with the ejection plate 16 and with respect to the upstream end of the actuating rod 31, each link 44 comprises two sliding surfaces 46, each formed by a wall of the link 44. The walls forming the sliding surfaces can be arranged in different ways, as will be described by way of example, as long as they are complementary and allow a displacement in translation of one with respect to the others. According to the embodiment shown in Figs. 1 to 6, each link 44 has, in a plane containing the first axis A1 and the second axis A2, an S-shaped section, as more particularly visible in FIG. 6. Thus, each link 44 comprises two outer branches and an inner branch interconnected so as to define two grooves 58, each extending between the inner branch and one of the outer branches and opening in two opposite directions. The opposing walls of the outer branches and the inner limb each define a sliding surface 46. Thus, as shown in FIG. 6, each link comprises six sliding surfaces 46a, 46b, 46c, 46d, 46e and 46f defined by the facing walls of each groove 58 and the external surfaces of the outer branches of the link 44. Such an embodiment makes it possible to ensure a robust connection between the links 44, since each link 44 is held in two grooves 58 of links 44 adjacent. In this case, the sub-link 52 of the actuating link 48 and the upstream end of the actuating rod 31 each comprise a complementary groove for receiving the sliding surface 46 of the end links.
    According to the embodiment shown in Figs. 7 and 8, each link 44 has, in a plane containing the first axis A1 and the second axis A2, a C-shaped section. The sliding surfaces 46 are formed on the opposite walls of each branch of C. In this case, as shown in FIG. 7, each link 44 comprises four sliding surfaces 46a, 46b, 46c and 4d defined by the walls opposite the two branches of C and the outer walls of these branches. Thus, each link is in contact with two adjacent links 44, each branch of the C defining two sliding surfaces 46, one being in contact with a link 44 and the other being in contact with another link 44, as shown in FIG. FIG. 8. According to this embodiment, each link 44 comprises two guide surfaces 54, for example formed by the flank connecting the two branches of C.
    According to the embodiment shown in Figs. 9 and 10, each link 44 comprises a groove 60 and a lug 62, the lug 62 being of complementary shape to that of the groove 60. The sliding surfaces 46 are defined by the inner surfaces of the groove 60 and by the surfaces. external of the lug 62. Thus, as shown in FIG. 9, each link 44 comprises six sliding surfaces 46. The groove 60 of a link 44 is thus arranged to receive the lug 62 of an adjacent link, as shown in FIG. 10. Such an embodiment provides a robust connection between the links 44 and a guide in the sliding of the links relative to each other. In this embodiment, the guide surfaces 54 of each link 44 are for example formed by the outer walls of the groove 60. According to an embodiment not shown, each link 44 comprises a groove and a pin similar to those shown on Figs. 9 and 10. In this embodiment, the guide surfaces 54 of each link 44 are spherical in shape. In this embodiment, the guide element is then of hollow tubular shape. Thus the first two sections 34, and the two second sections 40 are advantageously replaced each by a hollow tube in which the links 44 move.
    It should be noted that in the figures, the sliding surfaces 46 have been shown to be substantially planar. However, it is understood that these sliding surfaces could also be curved. In this case, the angle β is formed between a tangent to a sliding surface and a direction perpendicular to the first axis A1.
    It should be noted that, for each form described above, the sub-link 52 of the actuating link 48 and the upstream end of the actuating rod 31 each comprises a sliding surface 46 of shape adapted to provide a sliding contact with the sliding surfaces 46 of the links 44 described above. Such an embodiment has the advantage of being compact, especially in a direction perpendicular to the first and second axes A1 and A2.
    Sliding between the sliding surfaces 46 and between the links 44 and the guide member 30 may be facilitated by the materials used to make the sliding surfaces 46, the guide surfaces 54 and / or the guide grooves 36 and 42 or by coating these surfaces and / or walls or by using a lubricant.
    The ejection device may further comprise one or more ejection rods 64 extending in directions parallel to the first axis A1. One end of the ejector rod 64 is integral with the ejection plate 16 and its other end is flush with the molding surface 10 in the retracted position of the ejection device and forms part of the molding surface 10 as shown in Figs. 1 and 2. The ejection rod or rods 64 are arranged to allow the ejection of the molded article 2 in the mold opening direction, as will now be described.
    The operation of the ejection device described above will now be described.
    During the molding of the article, the mold is in the closed position and the ejection device is in the retracted position, in which the ejection plate 16 is in the upstream portion 20 of the space 18, the shank ejection 64 is flush with the molding surface 10 and in which, according to the embodiment shown in the figures, the ejection element 28 defines with the first part 4 the secondary molding cavity by its secondary molding surface 12.
    Once the article has been made, the mold is opened by spreading the first and second mold parts of each other in the opening direction D. During this opening or after it, the ejection device is actuated to move from its retracted position to its ejection position.
    To do this, the ejection plate 16 is actuated to move in the space 18 to the downstream portion 22 of this space 18, as shown in FIG. 3. During this movement, the excrement plate 16 moves along the first axis A1 by sliding around the first section 32 of the guide element 30, this first section 32 penetrating into the cavity 43 of the ejection plate provided for this purpose.
    The displacement of the ejection plate causes the ejector rod 64 to move in a direction parallel to the first axis, thereby moving the molded article 2 away from the molding surface 10 in that direction, as shown in FIG. 3.
    In addition, the displacement of the ejection plate causes the movement of the actuating link 48 along the first axis A1, which itself causes the links 44 to move in the guide element 30, the links 44 causing the displacement of the ejection element 28.
    As shown in FIG. 1, in the retracted position, the links 44 are initially in the first section 32 of the guide member 30. The displacement of the ejection plate 16 causes a displacement along the first axis A1 of the links 44 which engage gradually in the second section 38 and change direction to move along the second axis A2, as shown in FIG. 3. This change of direction is possible by sliding of the sliding surfaces 46 of the links 44 relative to each other.
    The displacement of the links 44 along the second axis A2 causes a displacement along said axis of the actuating rod 31 and the movable block. Due to the angle α between the first axis A1 and the second axis A2, moving the movable block causes the moving block to slide out of the undercut area 6, as shown in FIG. 3, which allows to unmould this area. It should be noted that by adjusting the value of the angle β, it is possible to delay or accelerate the movement of the moving block out of the undercut area 6 with respect to the displacement of the thrust device 14. C that is, for a displacement at a given speed of the thrust device along the first axis A1, the moving block will move at a higher speed, in the case of an accelerated movement, or less, in the case of a delayed movement, at this given speed. The acceleration or the delay in moving the movable block relative to the thrust device 14 makes it possible to synchronize the movement of the movable block with that of the ejection rod or rods 64 so that the moving block and the ejection rods 64 reach the ejection position at the same time while the ejection strokes are different.
    In FIG. 11, the angle a is substantially equal to 30 ° and the angle β is zero. In this case, the moving block moves at the same speed as the thrust device 14.
    In FIG. 12, the angle a is substantially equal to 35 ° and the angle β is substantially equal to -35 °. In this case, the moving block moves at a speed lower than the speed of displacement of the thrust device 14.
    In FIG. 13, the angle a is substantially equal to 20 ° and the angle β is substantially equal to -40 °. In this case, the moving block moves at a speed lower than the speed of displacement of the thrust device 14.
    In FIG. 14, the angle a is substantially equal to 15 ° and the angle β is substantially equal to 20 °. In this case, the moving block moves at a speed greater than the speed of displacement of the thrust device 14.
    In FIG. 15, the angle a is substantially equal to 15 ° and the angle β is substantially equal to 30 °. In this case, the moving block moves at a speed greater than the speed of displacement of the thrust device 14.
    Thus, it is understood that by choosing a negative angle β, the displacement of the moving block is delayed and by choosing a positive angle β, the displacement of the moving block is accelerated.
    When the ejection plate reaches its ejection position, in which it is for example in contact with the upper wall of the space 18 of the first part 4, as shown in FIG. 4, the molded article 2 is completely separated from the molding surface 10 and the moving block is completely extracted from the undercut area 6. Thus, the molded article 2 can be removed from the mold without hindrance and without interference with one of the mold parts and the ejection device.
    The ejection device described above thus allows the ejection of molded articles of large size and / or complex shape without weakening the first part of the mold. In addition, the transfer device may be used to adapt the ejection device to the shape of the molded article 2. The chain of links can be easily modified by adding or removing links 44, which are all identical and interchangeable. In addition, the angle α between the first axis A1 and the second axis A2 can be changed by simply changing an interface piece 66 interposed between the first section 32 and the second section 38. This interface piece 66 allows more or less incline the second section 38 relative to the first section 32. Thus, common elements of the ejection device, such as the links 44, the actuating rod 31, the first and second sections 34 and 40, the plate ejection head 16 and the ejection rod or rods 64 may be used for different molds. It is sufficient to change only the moving block when the shape of the secondary molding surface 12 is to be changed and / or the interface piece 66 when the angle a is to be changed.
    The ejection device described above could be modified in various ways while remaining in accordance with the invention. Thus, by way of example, the ejection element could not comprise a secondary molding surface and serve only for the separation of the molded article 2 from the molding surface 10, especially when the main surface 4 of the molding surface 10 molded article has areas extending in different directions from a direction substantially perpendicular to the opening direction. The links 44 could also be formed of simple blocks whose external surfaces form the sliding and guiding surfaces. In such an embodiment, the links 44 are not directly connected to one another and are in simple sliding contact with each other. compared to others.
    In addition, it is understood that the mold could comprise several second ejection elements 28 and several transfer devices 26 corresponding to allow the molding and ejection of several areas undercut 6 and / or the ejection of several areas of complex shape of the main surface 2. In this case, a single ejection plate 16 carrying several actuating links 48 may be provided for simultaneously actuating all the second ejection elements 28.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    An ejection device for a mold for producing a molded article (2) in a molding cavity for allowing ejection of the molded article (2) from said molding cavity, said device comprising: - a device thrust member (14) movable in translation along a first axis (A1) between a retracted position and an ejection position, - at least one ejection element (28) movable in translation along a second axis (A2), different from the first axis (A1), between a retracted position and an ejection position, - at least one transfer device (26) connecting the pusher (14) and the ejection element (28), said transfer device (26) being arranged to move the ejection element (28) along the second axis (A2) between its retracted position and its ejection position when the pusher (14) is moved along the first axis (A1) between its retracted position and its ejection position, characterized in that the transfer device (26) comprises at least two links (44) movable in translation relative to each other and relative to the thrust device (14) and to the ejection element (28).
    [2" id="c-fr-0002]
    2 .- ejection device according to claim 1, wherein the transfer device (26) comprises a guide element (30) receiving said links (44), said links (44) being moved in a displacement path in said guiding element (30) by the pusher (14) and moving the ejection element (28), said links (44) being guided in said guiding element (30) over the entire travel path.
    [3" id="c-fr-0003]
    3. - ejection device according to claim 2, wherein the guide member (30) comprises at least two opposite walls each extending in the displacement path.
    [4" id="c-fr-0004]
    4. - ejection device according to claim 3, wherein the links (44) each comprise two opposite guide surfaces (54), said guide surfaces (54) being respectively in permanent contact with an opposite wall of the element for guiding (30) over the entire travel path so that the links (44) are guided in said guide member (30) over the entire travel path.
    [5" id="c-fr-0005]
    5. - ejection device according to any one of claims 1 to 4, wherein the links (44) are identical to each other.
    [6" id="c-fr-0006]
    6. - ejection device according to any one of claims 1 to 5, wherein the second axis (A2) forms a non-zero angle (a) with the first axis (A1).
    [7" id="c-fr-0007]
    7. - ejection device according to any one of claims 1 to 6, wherein each link (44) comprises a first sliding surface (46) forming a translational surface with a first link (44) adjacent and a second sliding surface (46) forming a translation surface with a second adjacent link (44).
    [8" id="c-fr-0008]
    8. - ejection device according to claims 6 and 7, wherein each sliding surface (46) forms an angle (β) with respect to a direction perpendicular to the first axis (A1), said angle (β) being negative for delaying the displacement of the ejection element (28) relative to the thrust device (14) or positive to accelerate the displacement of the ejection element (28) relative to the thrust device (14) or zero for moving the ejection element (28) and the pusher (14) at the same speed.
    [9" id="c-fr-0009]
    An ejection device according to any one of claims 1 to 8, wherein the ejection element (28) comprises a secondary molding surface (12) arranged to form a portion of the molding cavity and for molding a portion of the molded article (2), moving the ejection element (28) into the ejection position causing separation of the secondary molding surface (12) from the portion of the molded article (2) molded by said secondary molding surface (10).
    [10" id="c-fr-0010]
    10. - ejection device according to any one of claims 1 to 9, wherein the thrust device (14) comprises an ejection plate (16) movable in translation in a direction parallel to the first axis (A1), said ejection device further comprising an ejector rod (64) integral with the ejection plate (16) and arranged to move the molded article (2) in said direction parallel to the first axis (A1).
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    同族专利:
    公开号 | 公开日
    EP3210735B1|2018-11-07|
    CA2958854A1|2017-08-26|
    ES2710303T3|2019-04-24|
    US20170246771A1|2017-08-31|
    CN107127937A|2017-09-05|
    CN107127937B|2020-10-23|
    FR3048197B1|2018-04-06|
    US10549459B2|2020-02-04|
    EP3210735A1|2017-08-30|
    PT3210735T|2019-02-12|
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    US5240719A|1989-09-05|1993-08-31|Caran Engineering|One piece safety cap molding apparatus|
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    JPH08238652A|1995-03-02|1996-09-17|Sekisui Chem Co Ltd|Injection mold|
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    CN201405466Y|2009-05-12|2010-02-17|黄岩星泰塑料模具有限公司|Speed-change core-pulling mechanism applied to internal-division buffer bar|
    FR2994882B1|2012-08-28|2015-08-21|Valeo Vision|INJECTION MOLDING DEVICE COMPRISING A DRAWER|
    EP3109026B1|2015-06-23|2018-11-28|Gerresheimer Regensburg GmbH|Device for the production of plastics objects with inserts|
    FR3048196B1|2016-02-26|2018-04-06|Faurecia Interieur Industrie|MOLD SEPARATION DEVICE COMPRISING A CHAIN OF ARTICULATED LINKS BETWEEN THEM|
    KR102307222B1|2017-04-17|2021-09-29|가부시키가이샤 테크노크라쯔|A holding unit and a protrusion mechanism of a molding die including the holding unit|ES2625252B1|2016-01-18|2018-04-24|Comercial de Útiles y Moldes, S.A.|Device for the demoulding of parts and mold comprising said device|
    FR3065388B1|2017-04-25|2020-06-26|Faurecia Interieur Industrie|EJECTION DEVICE FOR MOLD COMPRISING A SLIDING LINK CHAIN CONNECTED BY CONNECTING ELEMENTS|
    IT201800005920A1|2018-05-31|2019-12-01|Mold for a support element, for example a vehicle saddle, and a support element obtainable with this mold.|
    EP3636407B1|2018-10-10|2021-03-31|Stefan Pfaff Werkzeug- und Formenbau GmbH & Co. KG|Seal profile holder comprising a first and a second holding unit|
    FR3111838A1|2020-06-29|2021-12-31|Faurecia Interieur Industrie|Mold ejection device comprising a chain of sliding links and an adjustment shim|
    法律状态:
    2017-01-23| PLFP| Fee payment|Year of fee payment: 2 |
    2017-09-01| PLSC| Publication of the preliminary search report|Effective date: 20170901 |
    2018-01-23| PLFP| Fee payment|Year of fee payment: 3 |
    2019-01-23| PLFP| Fee payment|Year of fee payment: 4 |
    2020-11-13| ST| Notification of lapse|Effective date: 20201006 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1651639|2016-02-26|
    FR1651639A|FR3048197B1|2016-02-26|2016-02-26|EJECTION DEVICE FOR MOLD COMPRISING SLIDING LINK CHAIN|FR1651639A| FR3048197B1|2016-02-26|2016-02-26|EJECTION DEVICE FOR MOLD COMPRISING SLIDING LINK CHAIN|
    ES17157198T| ES2710303T3|2016-02-26|2017-02-21|Ejection device for mold comprising a chain of sliding links|
    EP17157198.7A| EP3210735B1|2016-02-26|2017-02-21|Ejection device comprising a chain of sliding links|
    PT17157198T| PT3210735T|2016-02-26|2017-02-21|Ejection device comprising a chain of sliding links|
    CA2958854A| CA2958854A1|2016-02-26|2017-02-22|Ejection device for mould including a chain with sliding links|
    US15/442,575| US10549459B2|2016-02-26|2017-02-24|Ejection device comprising a chain of sliding links|
    CN201710106841.4A| CN107127937B|2016-02-26|2017-02-27|Ejector with a row of sliding connections|
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