JP3974643B1 - Undercut processing mechanism - Google Patents

Abstract

[PROBLEMS] To be able to be compactly configured and meet the demand for space saving, easy to process and incorporate into a mold, and simple in structure, so that it takes less time and effort to assemble, and costs. An undercut processing mechanism that can realize down and has excellent durability is provided.
An ejector pin 21 slidably disposed in a movable die 12 so as to be slidable in a die-cutting direction is slidable in a relief direction from an undercut portion 2 intersecting the die-cutting direction. An ejector pin is provided in the holder 40 accommodated in the movable mold 12. The ejector pin has a coupling member 70 provided with an undercut molding portion 80 on the distal end side extending in an inclined state with the end sides coupled and extending out of the movable mold 12. A guide groove 42a is provided that extends along an inclined direction in which the connecting member 70 moves simultaneously in the die-cutting direction and the relief direction in accordance with the protruding operation of the guide 21, and guides the outer periphery of the connecting member 70 in a slidable manner.
[Selection] Figure 1

Description

  The present invention relates to an undercut processing mechanism that enables an undercut portion to be removed when a molded product having a undercut portion is molded by a fixed die and a movable die when the molded product is die-cut.

  Conventionally, as this type of molding die device, a guide rod in which a movable loose core support rod penetrating the core and inclined with respect to its surface is locked to the movable side mold plate and the pedestal plate is used. In the loose core ejector device that is linked to the movement of the slide base disposed in the slide path of the ejector plate so as to be slidable relative to the guide plate, one end of the guide rod is in a recess formed on the lower surface of the movable side template. It is known that the loose core support rod is locked by a tightly fitted holder, and the inclination angle is set only by an angle setting hole formed in the core at substantially the same inclination angle as the guide rod (for example, , See Patent Document 1).

JP 2002-326233 A

  However, in the conventional technique as described above, not only the loose core support rod but also the guide rod are inclined, and the mechanism for moving the rod at the same inclination angle is the ejector plate and the movable side plate. Because it is configured to disperse into a large amount of space, it requires a large installation space compared to the amount of movement of the piece with the undercut part shape necessary for removing the undercut of the molded product, and the structure becomes complicated overall. Assembling took time and effort, and it was difficult to reduce costs.

  In addition, since the inclination angle of the loose core support rod is set only by the angle setting hole formed in the core, high accuracy is required, which further increases the cost in terms of manufacturing and loads the angle setting hole. Since there is a tendency to concentrate, there is also a problem regarding durability at the site.

  The present invention has been made paying attention to the problems of the prior art as described above, can be configured compactly, can meet the demand for space saving, and can be processed and incorporated into a mold. It is an object of the present invention to provide an undercut processing mechanism that is easy to construct, has a simple structure, does not require labor and time for assembly, can reduce costs, and is excellent in durability.

The gist of the present invention for achieving the object described above resides in the inventions of the following items.
[1] In a molding die device (20 to 20D) for molding a molded product (1 to 1D) having an undercut portion (2 to 2D) by a fixed mold (11) and a movable mold (12). In the undercut processing mechanism (30 to 30E) that allows the undercut part (2 to 2D) to be removed at the time of die cutting (1 to 1D),
Undercut that intersects with the die-cutting direction with respect to the tip side of the ejector pin (21) that is driven in the die-cutting direction and protrudes and is slidably disposed in the movable die (12) in the die-cutting direction Undercut molded part (80-80D) on the distal end side that extends obliquely in a state where the base end side is connected so as to be slidable in the escape direction from the part (2-2D) and extends out of the movable mold (12) A connecting member (70 to 70E) for providing
In the movable mold (12) or in the holder (40 to 40E) housed in the movable mold (12), the connecting members (70 to 70E) are removed from the mold as the ejector pins (21) are projected. An undercut processing mechanism provided with a guide groove (42a) extending along an inclined direction that moves simultaneously in the direction and the relief direction and slidably guiding the outer periphery of the connecting member (70-70E) (30-30E).

  [2] The connecting member (70 to 70D) is formed from a round bar with a circular cross section, and the guide groove (42a) is formed as a hole with a circular cross section through which the round bar is slidable. The undercut processing mechanism (30-30E) according to [1].

[3] Provided on the tip side of the ejector pin (21) is a holding piece (23, 25) that is slidable in the mold release direction in the movable mold (12).
On the base end side of the connecting member (70 to 70E), the holding piece (23, 25) is slidable in the escape direction from the undercut portion (2 to 2D) intersecting the die-cutting direction. The escape operation piece part (71) to be connected is provided,
The undercut processing mechanism (30 to 30) according to [1] or [2], wherein the holding piece portions (23, 25) and the escape operation piece portion (71) are connected to each other so as to be able to push and pull. 30E).

  [4] A plurality of the ejector pins (21) are arranged in parallel to each other, and the base end side of the connecting member (70B) is slidably connected in the escape direction over the distal end side of each ejector pin (21). The undercut processing mechanism (30B) according to [1], [2] or [3].

[5] In the undercut processing mechanism (30C, 30D) that requires a relieving action in opposite directions from the undercut portion (2C, 2D),
A pair of at least the connecting members (70C, 70D) are disposed facing left and right symmetrically,
In the movable mold (12) or in the holder (40C, 40D) housed in the movable mold (12), the connecting members (70C, 70D) are molded in accordance with the ejecting operation of the ejector pin (21). A pair of guide grooves (42a) that extend along the inclined direction that moves simultaneously in the pulling direction and the opposite escape direction and that slidably guide the outer periphery of each connecting member (70C, 70D) are provided. The undercut processing mechanism (30C, 30D) according to [1], [2], [3] or [4].

  [6] The connecting member (70 to 70E) is set to a length corresponding to the punching stroke of the molded product (1 to 1D) [1], [2], [3] The undercut processing mechanism (30 to 30E) according to [4] or [5].

The present invention operates as follows.
The undercut processing mechanism (30 to 30E) according to the present invention is configured such that the connecting member (70 to 70E) connected to the ejector pin (21) that is driven in the die-cutting direction and operates to eject the ejector base plate (13) or Without being distributed to the movable mold (12), it is possible to concentrate on the movable mold (12). As a result, a compact configuration can be achieved and a space-saving request can be met, and processing and incorporation into a mold are facilitated.

  That is, the undercut portion that intersects the die-cutting direction with respect to the tip side of the ejector pin (21) that is arranged so that the connecting member (70 to 70E) is slidable in the die-cutting direction within the movable die (12). (2-2D) is arranged so as to be inclined and extended in a state where the base end side is connected so as to be slidable in the escape direction from (2D), and an undercut molding part ( 80 to 80D).

  Here, a space is secured in the movable mold (12) so that the connecting members (70 to 70E) can move simultaneously in the mold release direction and the escape direction in accordance with the ejecting operation of the ejector pin (21). The connecting members (70 to 70E) may be arranged directly in the mold (12), or the connecting members (70 to 70E) are placed inside the holder (40 to 40E) stored in the movable mold (12). ) In a state where it can move simultaneously in the die-cutting direction and the relief direction, and the connecting members (70-70E) are arranged in the movable mold (12) via the holders (40-40E). good.

  Then, in the movable mold (12) or in the holder (40 to 40E) housed in the movable mold (12), the connecting member (70 to 70E) is demolded as the ejector pin (21) protrudes. A guide groove (42a) is provided that extends along an inclined direction that simultaneously moves in the direction and the escape direction, and that slidably guides the outer periphery of the connecting member (70 to 70E). By such easy processing of the guide groove (42a), the connecting member (70 to 70E) or the undercut molded portion (80 to 80D) can surely lead to a state in which the undercut portion (2 to 2D) can be removed. it can.

  Such an undercut processing mechanism (30 to 30E) is operated in accordance with the ejecting operation of the ejector pin (21) driven in the die-cutting direction during the die-cutting operation of the molding die device (20 to 20D). To do. That is, when molding is finished and the fixed mold (11) is separated from the movable mold (12), one side of the molded product (1 to 1D) appears. Next, the ejector pin (21) performs a protruding operation so as to separate the molded product (1 to 1D) from the movable die (12) for die cutting.

  Then, in the movable mold (12) (or in the holder (40 to 40E) accommodated in the movable mold (12)), the coupling member (70 to 70E) coupled to the tip side of the ejector pin (21). Slides in the mold release direction together with the ejector pin (21), and simultaneously slides in the relief direction crossing the mold release direction with respect to the tip side of the ejector pin (21). (21) and the connecting members (70 to 70E) are relatively displaced.

  Due to the guide groove (42a) provided in the movable mold (12) or in the holder (40-40E) housed in the movable mold (12), the outer periphery of the connecting member (70-70E) is a guide groove. (42a) is slidably fitted and guided, and simultaneously moves in the mold release direction and the relief direction along the inclined direction of the connecting member (70 to 70E) itself. Through the connecting members (70 to 70E) that move in this manner, the undercut molding part (80 to 80D) also moves simultaneously in the die-cutting direction and the relief direction, and the undercut part (1 to 1D) of the molded product (1 to 1D) 2 to 2D) can be removed, and the molded product (1 to 1D) can be punched.

  The movement of the undercut molding part (80 to 80D) is guided by the fitting relationship between the outer periphery of the connecting member (70 to 70E) and the guide groove (42a) in the movable mold (12) or the holder (40 to 40E). Therefore, the load during the die-cutting operation is dispersed without being concentrated in one place, and the durability is improved. Furthermore, since high accuracy at the time of design is eased, the cost can be reduced.

  When the molded product (1 to 1D) is removed, as the ejector pin (21) returns to the molding position, the ejector pin (21) is pulled to the connecting member (70 to 70E) and the undercut molded part (80 ~ 80D) also return to the initial position. Further, the movable mold (12) also returns to the molding position, and the next molded product (1 to 1D) is molded.

  By the way, if the connecting member (70 to 70D) is formed from a round bar having a circular cross section and the guide groove (42a) is formed as a hole having a circular cross section through which the round bar is slidable, the movable member is movable. The connecting member (70-70D) can move simultaneously in the die-cutting direction and the relief direction very easily, for example, by drilling a hole directly in the mold (12) or in the holder (40-40D), for example. Space can be secured.

  In addition, a holding piece (23, 25) is provided on the distal end side of the ejector pin (21) so as to be slidable in the mold releasing direction in the movable die (12), and the connecting members (70 to 70E). The retraction operation piece portion (71) slidably connected to the holding piece portions (23, 25) in the retraction direction from the undercut portions (2 to 2D) intersecting the die-cutting direction. ), The holding piece portions (23, 25) and the escape operation piece portion (71) can be reliably connected so as to be relatively displaced in a state where they can be pushed and pulled.

  A plurality of ejector pins (21) are arranged in parallel to each other so that the base end side of the connecting member (70B) is slidably connected in order in the escape direction over the distal end side of each ejector pin (21). If so, a large stroke in the escape direction can be secured with a simple configuration.

  In the undercut processing mechanism (30C, 30D) for the molded product (1C, 1D) that requires a relieving action in both directions opposite to the undercut portion (2C, 2D), at least the connecting member (70C, 70D) is provided. A pair is arranged facing left and right symmetrically, and when the connecting members (70C, 70D) move in the die-cutting direction as the ejector pin (21) protrudes during the die-cutting operation, there is a contradiction at the same time. The molded product (1C, 1D) can be punched by moving in the escape direction.

  Furthermore, by setting the connecting member (70 to 70E) to a length corresponding to the die cutting stroke of the molded product (1 to 1D), the large stroke in the die cutting of the molded product (1 to 1D) can be achieved. Even small strokes can be handled as appropriate.

  According to the undercut processing mechanism according to the present invention, the connecting member connected to the ejector pin that is driven in the die-cutting direction and protrudes is concentrated only on the movable die without being distributed to the ejector base plate or the movable die. Therefore, it can be compactly configured, can meet the demand for space saving, and can be easily processed and assembled into a mold. Further, it is possible to eliminate the need for the angular pin and the loose core mechanism used in the conventional undercut punching method, and to reduce the mold manufacturing cost.

  Further, in the movable mold or in the holder accommodated in the movable mold, the connecting member extends along an inclined direction in which the ejector pin projects in accordance with the ejecting operation of the ejector pin. Since the guide groove for slidably guiding the outer periphery of the guide member is provided, the connecting member or the undercut molded part can be surely guided to a state where the undercut part can be removed by easy processing of the guide groove.

  In addition, since the movement of the undercut molding portion is guided by the fitting relationship between the outer periphery of the connecting member and the guide groove in the movable mold or the holder, the load during the die-cutting operation is not concentrated in one place. Dispersed to increase durability. Furthermore, since high accuracy is reduced at the time of design, the cost can be further reduced.

Hereinafter, various preferred embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a first embodiment of the present invention.
FIG. 1 is an explanatory view showing a main part for explaining the operation of the molding die apparatus 20 according to the first embodiment of the present invention. FIG. 2 is a longitudinal sectional view and a plan view of the holder 40 of the undercut processing mechanism 30 included in the molding die device 20, and FIG. 3 is an explanatory view showing the operation of the undercut processing mechanism 30. FIG. 4 is a perspective view showing an assembly process of the undercut processing mechanism 30.

  As shown in FIG. 1, a molding die device 20 is a device that molds a molded product 1 having an undercut portion 2 with a mold 10. The undercut portion 2 according to the present embodiment is a through hole formed in a flange at the end of the molded product 1. The mold 10 includes a fixed mold 11 that mainly molds an appearance portion of the molded product 1, a movable mold 12 that mainly molds an inner surface of the molded product 1, and an ejector base plate 13 that is driven in the vertical direction. Become. The material of the molded product 1 corresponds to not only a synthetic resin such as plastic but also a metal such as iron.

  The molding die apparatus 20 is in a state in which the ejector pin 21 that is driven in the mold-pulling direction as the ejector base plate 13 moves up and down and that protrudes and the undercut portion 2 can be removed when the molded product 1 is die-cut. An undercut processing mechanism 30 according to the present invention is provided. An undercut processing mechanism 30 provided on the distal end side of the ejector pin 21 is provided such that the base end portion 22 of the ejector pin 21 is fixed to the ejector base plate 13 with a knock pin or the like so that the ejector pin 21 protrudes in the mold release direction. The movable mold 12 is provided.

  The undercut processing mechanism 30 is inclined and extended with respect to the distal end side of the ejector pin 21 in a state in which the base end side is connected so as to be slidable in the escape direction from the undercut portion 2 intersecting the die-cutting direction. The connecting member 70 is provided with an undercut molding portion 80 on the tip side that extends to the outside of the mold 12. In the present embodiment, the connecting member 70 and the distal end side of the ejector pin 21 are accommodated in a holder 40 provided in the movable mold 12, but a space similar to the inside of the holder 40 is provided without providing the holder 40. You may comprise in the movable mold | type 12, and may comprise so that the front end side of the connection member 70 and the ejector pin 21 may each be accommodated in the movable mold | type 12 directly.

  As shown in FIG. 1, the holder 40 is fixed in a state of being accommodated in the movable mold 12. As shown in FIGS. 3 and 4, the holder 40 drills a circular hole 41 having a circular cross-section through which the tip of the ejector pin 21 is inserted in a cylindrical metal material, and intersects the vertical hole 41. In this way, the inclined hole 42 having a circular cross section extending through an inclination and through which the connecting member 70 is inserted is formed by drilling. The ejector pin 21 and the connecting member 70 are each formed from a round bar having a circular cross section.

  Thus, the inner periphery of the oblique hole 42 formed in the holder 40 extends along the inclined axial direction in which the connecting member 70 moves simultaneously in the die-cutting direction and the relief direction as the ejector pin 21 projects. A guide groove 42a for slidably guiding the outer periphery of the connecting member 70 is formed. In this embodiment, since the connecting member 70 is formed of a round bar, the inner periphery of the inclined hole 42 through which the connecting member 70 is inserted is used as it is as the guide groove 42a. However, the connecting member 70 can move. A guide groove may be separately provided in the space.

  FIG. 4 shows an assembly process of the undercut processing mechanism 30. FIG. 4A shows an exploded perspective view of the ejector pin 21, the connecting member 70, and the undercut forming portion 80, and FIG. 4B shows an ejector pin. The perspective view which shows the state which connected 21 and the connection member 70, the figure (c) is a perspective view which shows the state which attached the undercut shaping | molding part 80 to the front end side of the connection member 70, The figure (d), The perspective view which shows the holder 40 by itself, and the figure (e) are the perspective views which show the state which assembled | attached all the components of the undercut processing mechanism 30. FIG.

  As shown in FIGS. 4A to 4C, the upper end side of the ejector pin 21 extending in the up-down direction is connected to the lower end side of the connecting member 70 extending in an upward direction in the die cutting direction (up-down direction in the drawing). Are slidably connected in the escape direction (left and right direction in the figure) intersecting with. More specifically, a holding piece portion 23 is provided on the tip end side of the ejector pin 21 so as to be slidable in the mold release direction within the holder 40. On the other hand, on the base end side of the connecting member 70, an escape operation piece 71 is provided that is connected to the holding piece 23 slidably in the escape direction.

  The holding piece portion 23 is formed as a ridge at the tip of the ejector pin 21, and the relief operation piece portion 71 is formed as a dovetail that is movably fitted to the ridge so as to move left and right. The holding piece portion 23 and the escape operation piece portion 71 are connected to each other so as to be able to push and pull, and the connecting member 70 is set so as to move simultaneously in the mold release direction and the escape direction as the ejector pin 21 protrudes. Yes. Further, the distal end side of the connecting member 70 extends upward from an oblique hole 42 penetrating the upper end surface of the holder 40, and the undercut portion 2 of the molded product 1 is provided on the distal end side via an attachment pin 81. An undercut molding portion 80 for molding is integrally connected.

Next, the operation of the first embodiment will be described.
The undercut processing mechanism 30 of the molding die apparatus 20 has only the movable mold 12 without dispersing the ejector pins 21 and the undercut molding section 80 that constitute the main parts thereof to the ejector base plate 13 and the movable mold 12. Concentrate and arrange. As a result, a compact configuration can be achieved, a space-saving request can be met, and processing and incorporation into the mold 10 are facilitated.

  As shown in FIG. 4 (e), the undercut processing mechanism 30 can be configured as a unit together with the ejector pins 21, and the connecting member 70 is connected to the movable mold 12 via the holder 40 as shown in FIG. Can be easily retrofitted inside. Such a configuration is suitable when it is difficult to process the vertical hole 41 and the oblique hole 42 as the moving space of the connecting member 70 in the movable mold 12 itself, such as when the movable mold 12 is large.

  Although not shown in the drawing, the vertical hole 41 and the oblique hole 42 which are the same space as the inside of the holder 40 are directly provided in the movable mold 12 itself without accommodating the holder 40 which is a separate part in the movable mold 12. You may comprise in this way. As a result, the holder 40 is not required, the number of parts is reduced, the configuration of the entire molding die apparatus 20 can be further simplified, and the cost can be reduced. Such a configuration is suitable when it is easy to process the vertical hole 41 and the oblique hole 42 as the moving space of the connecting member 70 in the movable mold 12 itself as in the case where the movable mold 12 is small.

  In particular, in the present embodiment, the ejector pin 21 and the connecting member 70 are each formed from a round bar material having a circular cross section, and the vertical hole 41 and the oblique hole 42 are each provided with a circular cross section through which the round bar material is slidably inserted. Since the hole is formed as a hole, the space in which the ejector pin 21 protrudes or the connecting member 70 is formed in the holder 40 (or directly in the movable mold 12) by a drilling process. It is possible to secure a space that can move in the drawing direction and the escape direction simultaneously.

  FIG. 1A shows a state where the molding of the molded product 1 is completed. When the molding is finished and the fixed mold 11 is separated from the movable mold 12, one side (appearance portion) of the molded product 1 appears. Next, as shown in FIG. 1B, when the ejector base plate 13 is driven upward, the ejector pins 21 erected on the ejector base plate 13 remove the molded product 1 from the movable die for die removal. 12 so as to be spaced apart from 12 and project straightly in the die cutting direction (upward).

  Then, as can be seen in FIG. 1B, the connecting member 70 connected to the tip end side of the ejector pin 21 in the holder 40 accommodated in the movable mold 12 is in the mold release direction together with the ejector pin 21. , And simultaneously slides in the evacuation direction intersecting the mold release direction with respect to the tip end side of the ejector pin 21, so that the ejector pin 21 and the connecting member 70 are relatively displaced.

  In the present embodiment, on the distal end side of the ejector pin 21, there is a convex holding piece 23 that is slidable in the mold release direction in the movable mold 12, and on the proximal end side of the connecting member 70, Since there is a dovetail-shaped escape operation piece 71 that is slidably connected to the holding piece 23 in the escape direction, the distal end side of the ejector pin 21 and the proximal end side of the connecting member 70 are pushed together. It can be reliably connected so as to be relatively displaced in a pullable state.

  As the ejector pin 21 protrudes, the connecting member 70 is guided while the outer periphery of the connecting member 70 is slidably fitted in the guide groove 42a, which is the inner periphery of the inclined hole 42 provided in the holder 40. It moves simultaneously in the die-cutting direction and the relief direction so as to follow the inclined axial direction of itself. Through the connecting member 70 that moves in this way, the undercut molding part 80 also moves simultaneously in the die-cutting direction and the relief direction, so that the undercut part 2 of the molded product 1 can be removed, and the molded product 1 is molded. Can be removed.

  Since the movement of the undercut forming portion 80 is guided by the fitting relationship between the outer periphery of the connecting member 70 shown in FIG. 3 and the oblique hole 42 (guide groove 42a) in the holder 40, the load during the die cutting operation is reduced. It is dispersed without concentrating on one place, and durability is improved. Furthermore, since high accuracy at the time of design is eased, the cost can be reduced.

  When the molded product 1 is removed, as the ejector pin 21 returns to the molding position, the ejector pin 21 is pulled and the connecting member 70 and the undercut molding part 80 also return to the initial position. Further, the movable mold 12 also returns to the molding position, and the next molded product 1 is molded. Furthermore, by setting the connecting member 70 to a length corresponding to the stroke of punching of the molded product 1, it is possible to appropriately handle from a large stroke to a small stroke in punching of the molded product 1.

5 and 6 show a second embodiment of the present invention.
The molding die apparatus 20A, the mold 10A, and the undercut processing mechanism 30A according to the present embodiment are basically configured in the same manner as in the first embodiment. In order to form a molded product 1A including undercut portions 2A having different shapes, the shape of the undercut processing mechanism 30A is different in addition to the shape of the mold 10A. The undercut portion 2A is a hook (see FIG. 5) that protrudes from the inner surface of the molded product 1A.

  The undercut processing mechanism 30A includes a connecting member 70A having a small stroke but a large inclination angle, and the connecting member 70A has an attachment pin 81 so that one end side of the undercut forming portion 80A is sandwiched between the distal end portion 72 and the connecting member 81A. It has a structure to stop at. Moreover, the notch part 43 for the lower end side of the undercut shaping | molding part 80A to partially fit is formed in the upper end surface side of the holder 40A.

  As described above, the specific shapes of the connecting member 70A and the undercut forming portion 80A constituting the main part of the undercut processing mechanism 30A are designed in various shapes according to the shapes of the molded product 1A and the undercut portion 2A. be able to. In particular, in the present embodiment, since the notch 43 is formed in the holder 40A, the overall configuration can be made more compact. In addition, the same code | symbol is attached | subjected to the site | part same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

7 and 8 show a third embodiment of the present invention.
In order to mold the molded product 1B including the undercut portion 2B having a shape different from that of the molded product 1, the molding die device 20B, the mold 10B, and the undercut processing mechanism 30B according to the present embodiment In addition to the shape of the mold 10B, the configuration of the undercut processing mechanism 30B is different. The undercut portion 2B is a tubular convex portion (see FIG. 7) that protrudes outward from the flange at the end of the molded product 1B.

  The undercut processing mechanism 30B has a connecting member 70B having a large stroke and a large inclination angle, and a plurality (two in the present embodiment) of ejector pins 21 are arranged in parallel to each other. The base end side of the connecting member 70B is connected so as to be slidable in the escape direction over the distal end side. Here, the interval between the ejector pins 21 is such that the escape operation piece portion 71 on the proximal end side of the connecting member 70B can be simultaneously connected to the holding piece portions 23 on the distal end side of the two ejector pins 21. Is set.

  The undercut molding portion 80B is formed by combining a plurality of parts, and the distal end portion 72 of the connecting member 70B is connected to the lower end side of the undercut molding portion 80B via a reinforcing bracket 73. In addition, in the holder 40B, in addition to the two vertical holes 41 through which the respective ejector pins 21 are inserted, oblique holes 42 that extend obliquely intersecting these vertical holes 41 and guide the connecting member 70B. (Guide groove 42a) is formed.

  In this way, if a plurality of ejector pins 21 are arranged in parallel to each other and the base end side of the connecting member 70B is slidably connected in the escape direction over the distal end side of each ejector pin 21, the configuration can be simplified. A large stroke in the escape direction can be ensured. Further, instead of preparing a plurality of ejector pins 21, for example, a holding piece 23 that extends substantially horizontally is provided in a substantially T shape on the tip side of one ejector pin 21, and the holding piece 23 has a base of the connecting member 70 </ b> B. It is also possible to configure the escape operation piece portion 71 on the end side to be connected. In addition, the same code | symbol is attached | subjected to the site | part same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

9 and 10 show a fourth embodiment of the present invention.
The mold apparatus 20C, the mold 10C, and the undercut processing mechanism 30C according to the present embodiment are used to mold a molded product 1C including an undercut portion 2C having a shape different from that of the molded product 1. In addition to the shape of the mold 10C, the configuration of the undercut processing mechanism 30C is different.

  The undercut portion 2C is a protruding piece bent inward from the four corners of the lower end edge of the flange of the molded product 1C (see FIG. 10 (e)), and the undercut processing mechanism 30C is bi-directionally opposed to the undercut portion 2C. It has a structure that requires a relief operation (in a direction close to each other). A pair of the connecting member 70C, the undercut forming portion 80C, the holder 40C, and the ejector pin 21 are arranged facing each other in a bilaterally symmetrical manner.

  The connecting member 70 </ b> C has a structure that is fixed by a mounting pin 81 so that the lower end side of the undercut molded portion 80 </ b> C is sandwiched between the front end portion 72. Moreover, the notch part 43 for the lower end side of the undercut shaping | molding part 80C to partially fit is formed in the upper end surface side of each holder 40C. Each holder 40C is housed in the movable mold 12 so that the respective cutout portions 43 face each other.

  In each holder 40C, in addition to the vertical hole 41 through which the tip end side of the ejector pin 21 is inserted, the holder 40C extends so as to intersect with the vertical hole 41, and each connecting member 70C extends in the die-cutting direction and the opposite escape direction (mutually A slant hole 42 (guide groove 42a) is provided to be slidable at the same time in the approaching direction). However, it is not always necessary to provide a pair of holders 40C. For example, two vertical holes 41 through which the ejector pins 21 are inserted separately and two oblique holes 42 (guide grooves 42a) are respectively provided in one holder 40C. You may comprise so that it may provide symmetrically.

  Also, it is not always necessary to prepare two ejector pins 21. For example, a holding piece 23 extending substantially horizontally is provided in a substantially T shape on the tip side of one ejector pin 21, and is connected to the holding piece 23. The escape operation piece 71 on the base end side of the member 70C may be connected. In addition, the same code | symbol is attached | subjected to the site | part same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  As described above, in the undercut processing mechanism 30C that targets the molded product 1C that requires a relief operation in two opposite directions (directions close to each other) from the undercut portion 2C, at least the connecting member 70C faces left and right symmetrically. A pair of them are arranged, and when each connecting member 70C moves in the die-cutting direction in accordance with the ejecting operation of each ejector pin 21 during the die-cutting operation, it simultaneously moves in the opposite escape directions (directions close to each other). The molded product 1C can be punched.

  By the way, as another configuration, a pair of the connecting member 70C, the undercut molding portion 80C, the holder 40C, and the ejector pin 21 that face each other in a bilaterally symmetrical manner so that a large number of molded products 1C can be obtained. A plurality of sets may be arranged. Thereby, along with the ejecting operation of each ejector pin 21, each undercut molding part 80C moves in the die-cutting direction via each connecting member 70C and moves in opposite directions (directions close to each other), A plurality of molded products 1C can be punched at a time.

11 and 12 show a fifth embodiment of the present invention.
The mold apparatus 20D, the mold 10D, and the undercut processing mechanism 30D according to the present embodiment are used to mold a molded product 1D including an undercut portion 2D having a shape different from that of the molded product 1. In addition to the shape of the mold 10D, the configuration of the undercut processing mechanism 30D is different.

  The undercut portion 2D is a boss (see FIG. 11) that protrudes from the inner side surface of the molded product 1D and has a symmetrical undercut shape (see FIG. 11). The undercut processing mechanism 30D is bi-directionally opposed to the undercut portion 2D. It has a structure that requires a relief operation (in a direction away from each other). In other words, the connecting member 70D, the undercut forming portion 80D, and the ejector pins 21 are arranged in the holder 40D in pairs, facing each other in a bilaterally symmetrical manner.

  The connecting member 70 </ b> D has a structure in which the lower end side of the undercut molded portion 80 </ b> D is fixed to the distal end portion 72 via an attachment pin 81. In addition to the two vertical holes 41 through which the ejector pins 21 are inserted separately, the holder 40D extends in a state of obliquely intersecting the vertical holes 41 and guides the connecting members 70D. A hole 42 (guide groove 42a) is formed. The holder 40D may be divided into two parts corresponding to each connecting member 70D.

  Also, it is not always necessary to prepare two ejector pins 21. For example, a holding piece portion 23 extending substantially horizontally on the tip side of one ejector pin 21 is provided in a substantially T shape, and a connecting member is connected to the holding piece portion 23. The escape operation piece 71 on the base end side of 70D may be connected. In addition, the same code | symbol is attached | subjected to the site | part same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  As described above, in the undercut processing mechanism 30D that targets the molded product 1D that requires a relieving operation in two opposite directions (directions away from each other) from the undercut portion 2D, at least the connecting member 70D is faced symmetrically. A pair is provided, and when each connecting member 70D moves in the die-cutting direction with the ejecting operation of each ejector pin 21 at the time of the die-cutting operation, it simultaneously moves in the opposite escape directions (directions away from each other). The molded product 1D can be punched.

  By the way, as another configuration, in order to be able to take a large number of molded products 1D, a plurality of connecting members 70D, undercut molded portions 80D, and ejector pins 21 are arranged in pairs, each pair facing each other symmetrically. May be installed. As a result, each undercut molding portion 80D moves in the die-cutting direction via each connecting member 70D along with the ejecting operation of each ejector pin 21, and in an escape direction (a direction away from each other) opposite to each other. The plurality of molded products 1D can be punched at a time.

FIG. 13 shows a sixth embodiment of the present invention.
In the undercut processing mechanism 30E according to the present embodiment, a separate holding piece 25 extending substantially horizontally is provided in a substantially T shape on the tip end side of the ejector pin 21 (not shown), and the connecting member 70E is formed as a mold. The shaft portion 74 has a circular cross section extending in a slanting direction in the escape direction intersecting with the drawing direction, and a plate portion 75 integrally extending along the longitudinal direction on one end side of the shaft portion 74.

  The holding piece 25 is formed with a ridge 26, and at the lower end of the shaft portion 74 and the plate portion 75 of the connecting member 70E, the escaping piece 71 as a dovetail groove into which the ridge 26 is movably fitted. Are provided continuously. In addition to the narrow vertical hole 44 through which the holding piece 25 and the plate part 75 of the connecting member 70E are inserted, the holder 40E extends in an inclined manner so as to intersect the vertical hole 44, and the shaft of the connecting member 70E. An oblique hole 42 (guide groove 42a) is provided for guiding the portion 74 so as to be slidable simultaneously in the die-cutting direction and the relief direction.

  According to such an undercut processing mechanism 30E, it is possible to ensure a large stroke in the escape direction of the connecting member 70E and to realize a stable operation of the connecting member 70E. In addition, the same code | symbol is attached | subjected to the site | part same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to the above-described embodiments, and the present invention can be changed or added without departing from the scope of the present invention. Included in the invention. For example, the shapes of the molded products 1 to 1D and the undercut portions 2 to 2D are not limited to those illustrated.

  Further, in the above-described embodiment, the holding piece portion 23 is integrally provided on the distal end side of the ejector pin 21, and the escape operation piece portion 71 is integrally provided on the proximal end side of the connecting member 70. As in the configuration, the holding piece 23 is provided separately from the ejector pin 21 and connected later, or the escape operation piece 71 is provided separately from the connecting member 70 and connected later. May be.

  Moreover, in the said embodiment, although the connection member 70-70E and the front end side of the ejector pin 21 are accommodated in the holder 40-40E provided in the movable mold | type 12, this holder is not provided but the holder 40-40E is provided. A space similar to the inside of 40 to 40E may be formed in the movable mold 12, and the connecting members 70 to 70E and the distal end side of the ejector pin 21 may be directly accommodated in the movable mold 12. This eliminates the need for the holders 40 to 40E, reduces the number of parts, further simplifies the configuration of the molding die devices 20 to 20D as a whole, and reduces the cost.

  Further, in an undercut processing mechanism for a molded product that requires an escape operation in one direction from the undercut portion, at least a pair of the connecting member and the undercut molding portion are arranged adjacent to each other in the same direction, and die cutting is performed. When the ejector pin protrudes during operation, the undercut molding part moves in the die-cutting direction via the connecting member that is pushed and driven by the ejector pin, and moves in the relief direction that is the same direction as the molding. It can also be configured to die-cut the product.

  Also in this case, if the connecting member and the undercut molded part are arranged in pairs such that a pair of adjacent members in the same direction are arranged as one set, and a plurality of sets are arranged in one device, each one direction A molded product including a plurality of sets of undercut portions that require a relief operation can be formed.

It is explanatory drawing which shows the principal part for demonstrating operation | movement of the molding die apparatus which concerns on the 1st Embodiment of this invention. It is the longitudinal cross-sectional view and top view of the holder of the undercut process mechanism which the molding die apparatus which concerns on the 1st Embodiment of this invention has. It is explanatory drawing which shows operation | movement of the undercut process mechanism which the molding die apparatus which concerns on the 1st Embodiment of this invention has. It is a perspective view which shows the assembly process of the undercut process mechanism which the molding die apparatus which concerns on the 1st Embodiment of this invention has. It is explanatory drawing which shows the principal part for demonstrating operation | movement of the molding die apparatus which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows the assembly process of the undercut process mechanism which the molding die apparatus which concerns on the 2nd Embodiment of this invention has. It is explanatory drawing which shows the principal part for demonstrating operation | movement of the molding die apparatus which concerns on the 3rd Embodiment of this invention. It is a perspective view which shows the assembly process of the undercut process mechanism which the molding die apparatus which concerns on the 3rd Embodiment of this invention has. It is explanatory drawing which shows the principal part for demonstrating operation | movement of the molding die apparatus which concerns on the 4th Embodiment of this invention. It is a perspective view which shows the assembly process of the undercut process mechanism which the molding die apparatus which concerns on the 4th Embodiment of this invention has. It is explanatory drawing which shows the principal part for demonstrating operation | movement of the molding die apparatus which concerns on the 5th Embodiment of this invention. It is a perspective view which shows the assembly process of the undercut process mechanism which the molding die apparatus which concerns on the 5th Embodiment of this invention has. It is a perspective view which shows the assembly process of the undercut process mechanism which concerns on the 6th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Molded product 1A ... Molded product 1B ... Molded product 1C ... Molded product 1D ... Molded product 2 ... Undercut part 2A ... Undercut part 2B ... Undercut part 2C ... Undercut part 2D ... Undercut part 10 ... Mold 10A ... Mold 10B ... Mold 10C ... Mold 10D ... Mold 11 ... Fixed mold 12 ... Movable mold 13 ... Ejector base plate 20 ... Mold apparatus 20A ... Mold apparatus 20B ... Mold apparatus 20C ... Molding device 20D ... Molding device 21 ... Ejector pin 23 ... Holding piece 25 ... Holding piece 30 ... Undercut processing mechanism 30A ... Undercut processing mechanism 30B ... Undercut processing mechanism 30C ... Undercut processing Mechanism 30D: Undercut processing mechanism 30E: Undercut processing mechanism 40 ... Holder 40A ... Holder 40B ... Holder 0C ... Holder 40D ... Holder 40E ... Holder 41 ... Vertical hole 42 ... Oblique hole 42a ... Guide groove 43 ... Notch 44 ... Vertical hole 70 ... Connecting member 70 ... Connecting member 70A ... Connecting member 70B ... Connecting member 70C ... Connecting member 70D ... Connecting member 70E ... Connecting member 71 ... Escape action piece 74 ... Shaft part 75 ... Plate part 80 ... Undercut molding part 80A ... Undercut molding part 80B ... Undercut molding part 80C ... Undercut molding part 80D ... Undercut molding 81: Mounting pin

Claims (6)

In a mold apparatus for molding a molded product having an undercut portion with a fixed mold and a movable mold, in an undercut processing mechanism that allows the undercut portion to be removed when the molded product is die-cut,
Drives in the die-cutting direction and protrudes, and in the escape direction from the undercut portion that intersects the die-cutting direction with respect to the tip side of the ejector pin that is slidably arranged in the die-cutting direction in the movable die A connecting member that is inclined and extends in a state where the base end side is slidably connected, and has an undercut molding portion on the distal end side that extends out of the movable mold;
In the movable mold or in a holder housed in the movable mold, the coupling member extends along an inclined direction in which the ejector pin moves in the mold release direction and the relief direction in accordance with the ejecting operation of the ejector pin. An undercut processing mechanism characterized in that a guide groove is provided for slidably guiding the outer periphery of the sheet.   2. The underside according to claim 1, wherein the connecting member is formed of a round bar having a circular cross section, and the guide groove is formed as a hole having a circular cross section through which the round bar is slidably inserted. Cut processing mechanism. Provided on the tip side of the ejector pin is a holding piece that is slidable in the mold release direction within the movable mold,
Provided on the proximal end side of the connecting member, with respect to the holding piece portion, a relief operation piece portion that is slidably connected in a relief direction from an undercut portion that intersects the die-cutting direction,
The undercut processing mechanism according to claim 1, wherein the holding piece portion and the escape operation piece portion are connected to each other so as to be able to push and pull.   The plurality of ejector pins are arranged in parallel to each other, and the base end side of the connecting member is slidably connected in the escape direction over the tip end side of each ejector pin. The undercut processing mechanism described in 1. In the undercut processing mechanism that requires escape operation in both directions opposite to the undercut part,
A pair of at least the connecting members facing left and right symmetrically,
In the movable mold, or in a holder housed in the movable mold, the connecting members extend along an inclined direction in which the ejector pins are simultaneously moved in the mold release direction and the opposite escape direction in accordance with the ejecting operation of the ejector pin. The undercut processing mechanism according to claim 1, 2, 3, or 4, wherein a pair of guide grooves for slidably guiding the outer periphery of each connecting member is provided.   The undercut processing mechanism according to claim 1, 2, 3, 4, or 5, wherein the connecting member is set to a length corresponding to a punching stroke of the molded product.

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