Mold with ejection device with displacement and related method
The mold ejection device addresses the issue of component damage by using a wedge mechanism with guided movement to avoid contact with undercuts, ensuring reliable and compact ejection without deformation.
Patent Information
- Application Number
- CN202380039200.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-05-13
- Filing Date
- 2023-05-11
- Publication Date
- 2024-12-10
AI Technical Summary
Existing mold ejection devices damage components with undercuts due to contact during cooling and hardening, particularly deforming tabs with undercuts.
A mold ejection device with a wedge mechanism that includes a displacement part and disengagement part, allowing the wedge to move independently of the ejection element's movement, guided by a slot with specific angles, to avoid contact with undercuts during ejection.
Prevents damage to components with undercuts by ensuring the wedge moves away from the undercut area without additional clearance, enabling reliable and compact ejection without deformation.
Smart Images
Figure CN119110766A_ABST
Abstract
Description
[0001] The present invention relates to a mold, which includes a device for ejecting a component formed on a first mold part, the ejection device including: an ejection element, which can be translated relative to the first mold part in an ejection direction between a retracted position and an ejection position, at least one wedge, which can be translated relative to the first mold part in a displacement direction different from the ejection direction between a holding position and an ejection position, the ejection device having at least one driving configuration and a disengagement configuration, in which at least one driving configuration, the movement of the ejection element in the ejection direction drives the movement of the at least one wedge in the displacement direction, and in the disengagement configuration, the at least one wedge is not driven by the movement of the ejection element in the ejection direction, the wedge includes a protrusion, and the ejection element includes at least one slot.
[0002] The invention also relates to an associated ejection method.
[0003] Document FR3053269 A2 describes a die of the above type. The wedge comprises a projection for the undercut below the interface, and the ejection element defines a housing in which the projection is received in the driving configuration and outside the housing in the disengaging configuration.
[0004] At the end of ejection, the ejection element supports the ejected component, in particular at the tab comprising the undercut, and the wedge is spaced apart from the component, more particularly from the undercut.
[0005] However, the ejector element contacts the tab, which may retract as the component cools and hardens. Removing the component from the ejector element after cooling may damage the component, especially deforming the tab.
[0006] It is therefore an object of the present invention to improve a mould comprising an ejection device adapted for parts having undercuts so as not to damage the part to be ejected.
[0007] To this end, an object of the present invention is a mold of the above type, wherein the narrow slot includes a displacement part and a disengagement part, the disengagement part forms an angle with the displacement part, in the drive configuration, the protrusion is guided in the displacement part, and in the disengagement configuration, the protrusion is guided in the disengagement part.
[0008] According to a particular embodiment of the invention, the mold also has one or more of the following features, considered alone or in any technically possible combination:
[0009] - Angle between 60° and 150°;
[0010] - the wedge comprises an interaction interface adapted to retain the undercut region of the component in a retaining position, the interaction interface being arranged on a first face of the wedge, the protrusion being arranged on an interaction side face of the wedge different from the first face;
[0011] - the interacting side surface is adjacent to the first surface, preferably perpendicular to the first surface;
[0012] the mould comprises a guide element fixed relative to the first mould part, the wedge comprising an element complementary to the guide element, the wedge being guided relative to the first mould part during the movement of the wedge by the cooperation of the complementary element and the guide element;
[0013] One of the guide element and the complementary element is a projection and the other of the guide element and the complementary element is a slide;
[0014] - the protrusion is arranged on the interacting side of the wedge and the complementary element is arranged on the face of the wedge opposite to the interacting side;
[0015] the ejection device comprises a plurality of wedges, each wedge being capable of being moved translationally relative to the first mould part in a respective displacement direction different from the ejection direction, and when the ejection device is in the driving configuration, the movement of the ejection element in the ejection direction drives the movement of the wedge in its respective displacement direction;
[0016] The mould comprises two wedges, each wedge being movable in translation relative to the first mould part in a respective displacement direction different from the ejection direction, the respective displacement direction being opposite to the ejection direction.
[0017] The present invention also relates to a method for ejecting a component formed on a first mold part, comprising the following steps:
[0018] - supplying a mould as defined previously, the ejection device being in the driving configuration, the ejection element being in the retracted position and the at least one wedge being in the retaining position,
[0019] - a first movement of the ejection element in the ejection direction, driving a movement of at least one wedge in the displacement direction, and
[0020] A second movement of the ejection element in the ejection direction, during which the wedge is not driven by the movement of the ejection element.
[0021] Other features and advantages of the invention will become apparent on reading the following description, given by way of example only and made with reference to the accompanying drawings, in which:
[0022] [Fig. 1] Fig. 1 is a schematic partial cross-sectional view of a mold according to one embodiment of the present invention, wherein the ejection element is in a retracted position and the wedge is in a holding position,
[0023] [FIG. 2] FIG. 2 is a three-dimensional view of the mold shown in FIG. 1, wherein the ejector element is between the retracted position and the ejector position, the wedge member is in the ejector position,
[0024] [FIG. 3] FIG. 3 is a three-dimensional view of the mold shown in FIG. 1, wherein the ejector element is in the ejection position, the wedge member is in the ejection position,
[0025] [Fig. 4] Fig. 4 is a schematic diagram of details of the mold of Fig. 3, and
[0026] [Fig. 5] Fig. 5 is a partial three-dimensional view of a mold according to an alternative embodiment of the present invention, wherein the ejection element is in the ejection position and the wedge is in the ejection position. [Fig.
[0027] In the following, the terms "lower" and "upper" are defined relative to the opening direction of the production tool, and the term "laterally" is understood as being in a direction perpendicular to the opening direction of the tool.
[0028] In Figures 1 to 3 a production tool 1 is shown. The production tool 1 is designed to produce a moulded component 4. For example, the production tool 1 is an injection mould. The component 4 is produced, for example, by injection moulding of a plastic material.
[0029] The component 4 is, for example, a vehicle component, in particular an automotive component, such as an instrument panel body, a trim panel or other vehicle component, in particular an automotive component. The component 4 has a complex three-dimensional shape with at least one undercut area 6, i.e., the component comprises at least one surface which cannot be demoulded simply by separating the two mold parts and which requires a complementary molding element which is movable in a direction different from the direction of separation of the two mold parts. The component 4 comprises a main surface 8 and a tab 10 extending from the main surface 8.
[0030] The tab 10 is smaller than the main surface 8 of the component 4. At least one undercut area 6 is located on the tab 10.
[0031] In the example shown, the tab 10 is an attachment tab designed, for example, to enable the profiled part 4 to be snapped onto a vehicle structure. The tab 10 comprises a main portion 12 and an engagement portion 14.
[0032] The tab 10 , more particularly the engagement portion 14 , extends in a direction of extension E from the main surface 8 .
[0033] The extension direction E forms an angle α with the main surface 8 , for example comprised between 45° and 135°.
[0034] The angle α is measured on the side opposite the undercut.
[0035] In the example shown, the extension direction E is substantially perpendicular to the main surface 8 .
[0036] The main portion 12 extends in the extension direction E of the engagement portion 14 .
[0037] The engagement portion 14 is thinner than the main portion 12 to ensure that the tab 10 is flexible enough to perform its snap function.
[0038] In particular, the engagement means 14 allow the tab 10 to act resiliently relative to the major surface 8 .
[0039] The engagement portion 14 thus defines a first undercut region 6 of the component 4 .
[0040] For purposes of illustration, an example of component 4 is described herein.
[0041] However, the invention is applicable to any type of undercut, large or small.
[0042] Alternatively, the tabs are not attachment tabs, but are clamp retainers or welding tabs.
[0043] Alternatively to the described example, the undercut is for example due to the shape of the main surface of the component itself and not due to any element protruding from its surface.
[0044] The production tool 1 comprises a first mold part 20 , a second mold part (not shown) and a device 22 for ejecting the component 4 .
[0045] The ejection device 22 includes an ejection element 26 and a wedge 28 .
[0046] The first mould part 20 and the second mould part each comprise a moulding surface 30 facing a moulding surface of the other component.
[0047] The first part 20 and the second part are translationally movable relative to each other along a movement direction between an open position and a closed position.
[0048] In the open position, shown in Figures 1 to 3, the first and second parts 20 are spaced apart so as to leave an accessible gap between the molding surfaces 30. This space allows components to be loaded into the mold 1 or to be removed using the ejection device 22 after production.
[0049] In the closed position (not shown), the first and second parts 20 are brought together to define between the moulding surfaces 30 a main cavity having the shape of the main surface 8 of the part 4 to be formed. The main cavity is in fluid communication with a source of injection material, for example.
[0050] The first mold part 20 has a thickness e in the direction of movement. This thickness e is required to accommodate functional elements of the mold 1, such as an ejection system, cooling channels and a mold manipulation system (not shown). In addition, the first part 20 of the mold may include a heating member and / or a nozzle for injecting plastic material with its thickness e into the main cavity.
[0051] The ejection device 22 comprises a guide element 34 , here a sleeve extending in the displacement direction over the thickness e, which is also included in the ejection device 22 .
[0052] The guide member 34 is fixed relative to the first mould part 20 .
[0053] Alternatively, the guide member 34 is made of the same material as the first mould part 20 .
[0054] The guide member 34 is adapted to receive the remainder of the ejection device 22, more specifically, the ejection member 26 and the wedge 28, when the ejection member 26 and the wedge 28 are in the retracted position and the retaining position, respectively, as will be described below and shown in FIG. 1 .
[0055] A guide member 34 leads through the moulding surface 30 of the first part 20 to the main cavity.
[0056] The guide means 34 comprise guide elements 35 , in this case projections.
[0057] The guide element extends opposite the wedge 28 .
[0058] The guide element 35 is positioned on the inner contour 36 of the guide part 34 .
[0059] The ejection element 26 is translationally movable relative to the first mold part 20 in an ejection direction A between a retracted position shown in FIG. 1 and an ejection position shown in FIG. 3 .
[0060] The ejection direction A is, for example, substantially parallel to the extension direction E of the tab 10 .
[0061] The wedge 28 is translationally movable relative to the first mold part 20 in a displacement direction B between a holding position shown in FIG. 1 and an ejection position shown in FIGS. 2 and 3 .
[0062] The wedge 28 is mounted so as to be translationally movable in the displacement direction B along the guide element.
[0063] The displacement direction B is different from the ejection direction A. For example, the displacement direction B forms an angle with the ejection direction A of between 1° and 30°, preferably between 4° and 30°.
[0064] For example, the movement direction of the first mold part and the second mold part is parallel to the ejection direction A.
[0065] The ejection device 22 has at least one driving configuration and a disengagement configuration, in which the movement of the ejection element 26 in the ejection direction A drives the movement of the wedge 28 in the displacement direction B, and in the disengagement configuration, the wedge 28 is not driven by the movement of the ejection element 26 in the ejection direction A.
[0066] The ejection element 26 has the shape of an arm extending in the ejection direction A.
[0067] The ejector element 26 comprises an upper portion 44 and a lower portion 46 designed to come into contact with the molded part 4 .
[0068] The ejection element 26 has an outer side wall 48 intended to come into sliding contact with the inner contour 36 of the guide part 34 and the first mould part 20 , and a lateral interaction wall 50 which is arranged opposite the wedge 28 .
[0069] The upper portion 44 defines a top wall in contact with the major surface 8 .
[0070] When the ejector element 26 is in the retracted position, the upper contact wall extends continuously with the molding surface 30 of the first mold part 20 and forms a part of the main molding cavity.
[0071] The lower portion 46 is for example linked to a drive mechanism (not shown) capable of controlling the movement of the ejection element 26 between its retracted position and its ejection position.
[0072] The drive mechanism comprises, for example, an ejector plate controlling the movement of the ejector element 26. The ejector plate is actuated by any suitable means, for example by a cylinder, for example a hydraulic cylinder.
[0073] Furthermore, the ejection element 26 defines a slot 56 , which is shown in more detail in FIG. 4 . In the example, the slot 56 is arranged in the lateral interaction wall 50 .
[0074] The slot 56 includes a displacement portion 58 and a disengagement portion 60 , wherein the disengagement portion 60 forms an angle β with the displacement portion 58 .
[0075] The breakaway portion 60 is parallel to the ejection direction A.
[0076] The angle β is between 60° and 150°.
[0077] For example, if the angle α measured on the side opposite to the undercut is strictly smaller than 90°, the angle β may be strictly smaller than 90°.
[0078] In the example shown, the angle β is greater than or equal to 90°.
[0079] In the embodiment shown, the displacement portion 58 extends parallel to the main surface 8 to within one degree.
[0080] The displacement portion 58 extends from the detachment portion 60, more particularly, from the upper end of the detachment portion 60. More specifically, the displacement portion 58 extends from the upper end of the detachment portion 60 toward the side of the undercut region 6.
[0081] Angle β is greater than or equal to angle α.
[0082] The angle β is here substantially equal to the angle α within one degree.
[0083] Alternatively, the angle β is strictly greater than the angle α by more than one degree, preferably more than 3°.
[0084] The wedge 28 has the shape of an arm extending in the displacement direction B.
[0085] The wedge 28 comprises an upper portion 68 and a lower portion 70 designed to come into contact with the shaped part 4 .
[0086] The upper portion 68 of the wedge 28 defines an upper contact wall 76 with the major surface 8 .
[0087] When the wedge 28 is in the retaining position, the upper contact wall 76 extends continuously with the molding surface 30 of the first mold portion 20 and forms a portion of the primary molding cavity.
[0088] The wedge 28 includes a first side 62 , an interaction side 64 and an outer sidewall 66 .
[0089] The wedge 28 , and in particular the first side 62 , includes a contoured surface 38 .
[0090] The shaped surface 38 has a shape complementary to the undercut.
[0091] Once the component has been moulded, the shaped surface 38 forms an interaction interface suitable for retaining the undercut when the wedge 28 is in the retaining position.
[0092] The interaction side 64 faces toward the ejection element 26 .
[0093] The ejection device 22 , more specifically the ejection element 26 and the wedge 28 , together with the mold define a secondary cavity 42 shown in FIG. 1 , having the shape of the tab 10 of the component 4 , when the ejection element 26 and the wedge 28 are in their retracted and holding positions, respectively.
[0094] The wedge 28 has a shape complementary to the undercut. After the part is moulded, only the wedge 28 is in contact with the undercut area.
[0095] The main chamber and the sub-chamber 42 are in fluid communication.
[0096] The outer side wall 66 is intended to come into sliding contact with the profile 36 of the guide element.
[0097] The outer side wall 66 is provided with an element 70 complementary to the guide element 35 .
[0098] The complementary element 70 is, for example, a slide extending in the displacement direction B.
[0099] The complementary element 70 is arranged on the face of the wedge 28 opposite the interaction side 64 .
[0100] The face extends substantially in a plane parallel to or colinear with the displacement direction B.
[0101] During the movement of the wedge 28 , the movement of the wedge 28 relative to the first mould part 20 (here in the displacement direction B) is guided by the cooperation of the complementary element 70 and the guide element.
[0102] The displacement direction B is such that the forming surface 38 moves out of the undercut region 6 during the movement of the wedge 28 from the retaining position to the ejection position.
[0103] The wedge 28 , in particular the interaction side 64 , is provided with a projection 68 .
[0104] In this case, the interaction side surface 64 is adjacent to the first side surface 62 , for example perpendicular thereto.
[0105] The protrusion 68 cooperates with the slot 56. More specifically, the protrusion 68 moves into the slot 56 during the movement of the ejection element 26.
[0106] When the ejection element 26 is in the retracted position and the wedge 28 is in the retaining position, the protrusion 68 is arranged in the displacement portion 58 of the slot 56 at a distance from the disengagement portion 60 .
[0107] In the driven configuration, the projection 68 is guided into the displacement section 58 .
[0108] Since the displacement portion 58 is at an angle to the ejection direction A, the ejection element 26 moving in the ejection direction A drives the movement of the wedge 28 and also guides the wedge in the displacement direction B through the cooperation of the complementary element 70 and the guide element.
[0109] In the disengaged configuration, the protrusion 68 is guided into the disengagement portion 60 .
[0110] Since the disengaging portion 60 is parallel to the ejection direction A, the ejection element 26 moving in the ejection direction A does not drive the wedge 28 .
[0111] In the example shown in the figures, the wedge 28 is a one-piece unit.
[0112] Alternatively, the wedge comprises two separate integral parts: a wedge head and a wedge pusher. The wedge head comprises a molded part, in this case a shaped surface. The wedge pusher provides guidance and comprises a protrusion. Such a wedge is otherwise known as a wedge with an auxiliary head.
[0113] A method for ejecting a component 4 will now be described, illustrating the operation of the production tool 1 .
[0114] When the tool 1 is used to produce a component 4 , the wedge 28 is in the holding position and the ejection element 26 is in the retracted position.
[0115] The ejection device 22 is in the driven configuration.
[0116] The first mold section 20 and the second mold section are in a closed position, with the primary and secondary mold cavities 42 defined by the mold sections and the ejector 22. A molding material is injected into the primary cavity and fills the primary and secondary cavities 42 to form the component 4.
[0117] Once the component 4 has been produced, the first mould part 20 and the second mould part are moved relative to each other into an open position, as shown in FIG. 1 , to allow removal of the finished component 4 .
[0118] Once the production tool 1 has been opened, or while the production tool 1 is being opened, the process of ejecting the formed part 4 begins.
[0119] In the first ejection phase, the ejection device 22 is in the first drive configuration. The ejection element 26 is moved by the drive mechanism in the ejection direction A toward its ejection position. During this movement, the protrusion 68 moves into the displacement portion 58. The wedge 28 moves in the displacement direction B under the guidance of the cooperation of the guide element and the complementary element 70.
[0120] Thus, in a first phase, the ejection element 26 moves in the ejection direction A and drives the wedge 28 which moves in the displacement direction B. By controlling the movement speed of the ejection element 26 , the movement speed of the wedge 28 can be controlled.
[0121] During this movement, the ejection element 26 drives the component in the ejection direction A towards the ejection position. As a result, the main surface 8 of the component is separated from the molding surface 30 of the first mold part 20. The main surface 8 of the component remains in contact with the upper contact wall 52 of the ejection element 26.
[0122] During the first ejection phase, each undercut region 6 of the tab 10 is disengaged by the displacement of the wedge 28 .
[0123] In the example shown, with angle β substantially equal to angle α, the upper contact wall 76 of the wedge remains in contact with a portion of the major surface 8 but slides along the major surface 8 and away from the tab 10 in the X direction.
[0124] Alternatively, as described above, the angle β is greater than the angle α by more than one degree, preferably by more than 3°. This allows the wedge to be separated from the workpiece over the entire contact surface even during the first ejection phase. The difference between the angle β and the angle α depends in particular on the shape of the undercut. The difference is, for example, less than or equal to 80°, preferably 60°.
[0125] The displacement direction B and the ejection position of the wedge are such that a lateral deflection of the upper contact wall 76 of the wedge 28 along the main surface 8 does not damage the component 4 .
[0126] Furthermore, during this movement, since the ejection direction A and the displacement direction B are different, the protrusion 68 moves in the slot 56 toward the escape portion 60 .
[0127] When the wedge member 28 reaches the ejected position, as shown in FIG. 2 , the protrusion 68 is disposed at the intersection between the displacement portion 58 and the disengagement portion 60 .
[0128] The ejection device 22 is then in the disengaged configuration.
[0129] The ejection element 26 can continue its travel in the ejection direction A without driving the wedge 28 in the displacement direction B beyond its ejection position.
[0130] In the second ejection phase, the ejection element 26 continues its travel until it reaches its ejection position and finally leaves the component 4. During the movement of the ejection element 26 beyond the ejection position of the wedge 28, the wedge 28 is no longer displaced relative to the first mold part 20. Therefore, it is not necessary to provide the wedge 28 with a large lateral clearance.
[0131] In a second phase, the projection 68 is moved relative to the ejection element 26 in the ejection direction A into the release section 60 .
[0132] When the tool 1 is later used to form other parts 4, the wedges are returned to the retaining position and the ejector element to the retracted position in order to reform the original secondary cavity 42, wherein the projection 68 moves in the slot 56 in a movement opposite to that described above.
[0133] Production tools can be made more compact while retaining sufficient travel to allow removal of formed parts.
[0134] Furthermore, the ejection element 26 can be actuated by a simple hydraulic cylinder with a control device, without the need for a synchronization unit for the wedge control.
[0135] The ejector device 22 can be installed in production tools of different shapes. The ejector device 22 is reliable and has a mechanically controlled ejection stroke and displacement stroke. In addition, the component 4 (especially the area with the undercut portion 6) is completely separated at the end of ejection.
[0136] The moving distance of the wedge 28 is smaller than the moving distance of the ejection element 26 .
[0137] The system is simple and does not require complicated adjustments. The system requires little space. Because the wedge 28 is controlled only by the ejection element 26, there is no disadvantage of the wedge rods intersecting. This arrangement prevents the wedge 26 from lagging or accelerating relative to the ejection element 28. The stroke of the ejection element 26 is not limited by the stroke of the wedge 26. The component 4 is released from the wedge 26 before the ejection is completed.
[0138] Due to the simplicity of the device, assembly, adjustment and maintenance are very straightforward. The system is easily automated.
[0139] In this description, the production tool is an injection mold, but the ejector device can be adapted for any type of mold.
[0140] In an alternative embodiment, the wedge comprises a projection forming a complementary element and the guide part comprises a slot in the displacement direction forming the guide element.
[0141] Alternatively, the tab 10 has a different shape. For example, the tab 10 is an anti-sinking marking element, or a clamp holder or the like.
[0142] In an alternative embodiment, the ejection device 122 comprises a single ejection element 126 and a plurality of wedges 128 , 130 , here two wedges in the example shown in FIG. 5 .
[0143] The ejector element 126 is similar to the ejector elements described above.
[0144] The ejection element 126 is movable in an ejection direction A.
[0145] The projection of each wedge cooperates with the slot of the ejection element similarly to what has been described previously, ie in the driving configuration the projection is guided in the displacement portion and in the disengagement configuration the projection is guided in the disengagement portion.
[0146] In the example shown, the ejection element 126 comprises a slot including one zone per wedge, each zone including a displacement portion and a disengagement portion, as described above.
[0147] More specifically, the slot includes a first region 134 adapted to mate with a first one of the wedges 130 and a second region 136 adapted to mate with a second one of the wedges 128 .
[0148] Each zone includes a displacement portion 138, 140 and a disengagement portion 142, 144 relative to the corresponding wedge 128, 130, as previously described in contrast to the slot for a single wedge.
[0149] Alternatively, the ejector element comprises as many slots as the number of wedges, each slot being capable of cooperating with a respective wedge.Each slot is then opposite to a corresponding wedge as described above with respect to FIGS. 1 to 3 .
[0150] Each disengagement portion forms a corresponding angle with the corresponding displacement portion.
[0151] The corresponding angles are likely to be different from each other.
[0152] The displaced portions 138, 140 may have different lengths.
[0153] This depends, in particular, on the size and / or shape of the undercut to be demoulded and on the shape of the main surface.
[0154] Each wedge 128 , 130 is translationally movable relative to the first mold part 110 in a respective displacement direction B1 , B2 different from the ejection direction A.
[0155] Here, the displacement directions B1, B2 are opposite to the ejection direction A, preferably symmetrical.
[0156] In this case, the tab of the profiled part comprises two undercut areas on opposite sides.
[0157] Each wedge 128, 130 includes a protrusion similar to the protrusions previously described.
[0158] For each wedge, the mould here also comprises a guide element which is fixed relative to the first mould part and which can cooperate with the corresponding wedge, ie the two wedges.
[0159] Each wedge 128, 130 here also comprises a complementary element 146, 148 of a corresponding guide element, similar to what has been described previously.For example, each wedge 128, 130 comprises a slide extending in its respective displacement direction B1, B2.
[0160] Thus, the cooperation of each complementary element 146 , 148 with the corresponding guide element guides the movement of each wedge along its respective displacement direction B1 , B2 .
[0161] Similar to what has been described previously, when the ejection device 122 is in the driving configuration, the movement of the ejection element 126 in the ejection direction A drives the movement of each of the wedges 128, 130 in its respective displacement direction B1, B2, and does not drive the wedges 128, 130 when the ejection device 122 is in the disengaged configuration.
[0162] In this way, the movement of the ejection device simultaneously releases the undercut region of the wedge.
[0163] This device is particularly advantageous since the movement of the wedges is synchronized due to the fact that they are driven by the ejection element.
[0164] This device is also suitable for a component comprising different tabs or strips, each of which has at least one undercut area. Therefore, a wedge is provided for each undercut area, the wedge having a respective displacement direction suitable for moving the wedge away from the corresponding undercut area, all wedges being driven by the ejection element.
[0165] In this way, one or more wedges operating in a similar manner as described above can be provided to interact with a second lateral interaction wall, for example opposite or adjacent to the lateral interaction wall of the same ejection element. In this way, a plurality of different undercuts can be ejected via a single ejection element interacting with a plurality of wedges.
[0166] In one embodiment, two or more wedges may be associated with the same wall of an ejection element, for example to eject several undercuts aligned on the workpiece along a defined direction along the ejection element.
[0167] In this way, the mold according to the invention enables the part to be ejected while at the same time detaching the undercut area of the mold component. At the end of the ejection, the undercut area is no longer in contact with the mold part, so that even in the event of shrinkage, there is no risk of damaging the undercut when removing it from the mold.
Claims
1. A mould comprising means (22; 122) for ejecting a component (4) formed on a first mould part (20), the ejecting means (22; 122) comprising: an ejection element (26; 126) which is movable translationally relative to the first mould part (20) in an ejection direction (A) between a retracted position and an ejection position, at least one wedge (28; 128, 130) which is movable translationally relative to the first mold part (20) between a holding position and an ejection position in a displacement direction (B; B1, B2) different from the ejection direction (A), The ejection device (22; 122) has at least one drive configuration and a disengagement configuration, in which, in the at least one drive configuration, the movement of the ejection element (26; 126) in the ejection direction (A) drives the movement of the at least one wedge (28; 128, 130) in the displacement direction (B; B1, B2), and in the disengagement configuration, the at least one wedge (28; 128, 130) is not driven by the movement of the ejection element (26; 126) in the ejection direction (A), The wedge (28; 128, 130) comprises a protrusion (68), the ejection element (26; 126) comprises at least one slot (56), Characterized in that the slot (56) comprises a displacement portion (58; 138, 140) and a disengagement portion (60; 142, 144), the disengagement portion (60; 142, 144) forming an angle (β) with the displacement portion (58; 138, 140), in which, in the drive configuration, the protrusion (68) is guided in the displacement portion (58; 138, 140), and in the disengagement configuration, the protrusion is guided in the disengagement portion (60; 142, 144). 2 . The mold according to claim 1 , wherein the angle (β) is between 60° and 150°.
3. A mold according to claim 1 or 2, wherein the wedge (28; 128, 130) comprises an interaction interface (38) suitable for holding the undercut area (6) of the component (4) in the holding position, the interaction interface (38) being arranged on a first face (62) of the wedge (28; 128, 130), and the protrusion (68) being arranged on an interaction side face (64) of the wedge (28; 128, 130) different from the first face (62).
4. The mold according to claim 3, wherein the interaction side surface (64) is adjacent to the first face (62), preferably perpendicular to the first face.
5. The mold according to any one of claims 1 to 4, comprising a guide element (35) fixed relative to the first mold part (20), the wedge (28; 128, 130) comprising an element (70; 146, 148) complementary to the guide element (35), and during the movement of the wedge (28; 128, 130), the wedge (28; 128, 130) is guided relative to the first mold part (20) by the cooperation of the complementary element (70; 146, 148) and the guide element (35).
6. The mold according to claim 5, wherein one of the guide element (35) and the complementary element (70; 146, 148) is a projection and the other of the guide element (35) and the complementary element (70; 146, 148) is a slide.
7. The mold according to claim 5 or 6, wherein the protrusion (68) is arranged on the interaction side (64) of the wedge (28; 128, 130) and the complementary element (70; 146, 148) is arranged on the face of the wedge (28; 128, 130) opposite the interaction side (64).
8. The mold according to any one of claims 1 to 7, wherein the ejection device (122) comprises a plurality of wedges (128, 130), each wedge (128, 130) being capable of translationally moving relative to the first mold part (20) along a respective displacement direction (B1, B2) different from the ejection direction (A), and when the ejection device (122) is in the driven configuration, the movement of the ejection element (126) along the ejection direction (A) drives the movement of the wedges (128, 130) along their respective displacement directions (B1, B2).
9. The mold according to claim 8, comprising two wedges (128, 130), each wedge (128, 130) being capable of translationally moving relative to the first mold part (20) in a respective displacement direction (B1, B2) different from the ejection direction (A), the respective displacement direction (B1, B2) being opposite to the ejection direction (A).
10. A method of ejecting (22) a component (4) formed on a first mold part (20), the method comprising the following steps: - supplying a mold according to any one of claims 1 to 9, the ejection device (22; 122) being in the drive configuration, the ejection element (26; 126) being in the retracted position, the at least one wedge (28; 128, 130) being in the holding position, - a first movement of the ejection element (26; 126) in the ejection direction (A) drives the movement of the at least one wedge (28; 128, 130) in the displacement direction (B; B1, B2), and - a second movement of the ejection element (26; 126) in the ejection direction (A), the wedge (28; 128, 130) not being driven by the movement of the ejection element (26; 126) during the second movement.