JP3974641B1 - Mold equipment for molding - Google Patents

Abstract

[PROBLEMS] To be able to be compactly configured and meet demands for space saving, easy to process and incorporate in a mold, simple in configuration, and does not take time and effort to assemble. Provided is a molding die apparatus that can realize down and has excellent durability.
The holder is provided with a slanting groove extending in an inclined manner, and a slanting strip is provided on the upper wall surface portion of the holder to be slidably fitted to the slanting groove. Is formed with a guide hole 46 that is slidably guided in a state where the sliding pin 70 penetrates and is inclined, and when the holding piece 50 moves in the die-cutting direction as the ejector pin 21 protrudes, The undercut molding part 80 moves in the die-cutting direction and moves in the relief direction via the relief-moving piece 60 and the sliding pin 70 that are pushed and driven, and the molded product P can be die-cut.
[Selection] Figure 1

Description

  The present invention relates to a molding die apparatus that can mold a molded product including an undercut portion with a fixed mold and a movable mold, and can be released from the undercut portion 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 a molding die apparatus that is easy to construct, has a simple structure, does not require labor and time for assembly, can achieve cost reduction, and has excellent durability.

The gist of the present invention for achieving the object described above resides in the inventions of the following items.
[1] The molded product (P) including the undercut portion (P1) can be formed by the fixed die (11) and the movable die (12), and the undercut portion ( In the mold apparatus (20) that can be released from P1),
An ejector pin (21) which is driven in a die-cutting direction and protrudes, and an undercut punching device (30) provided on the tip side (23) of the ejector pin (21),
The undercut punching device (30) is provided in a holder (40) accommodated in the movable die (12) and a tip side (23) of the ejector pin (21). A holding piece (50) slidably arranged in the die-cutting direction, and a relief slidably connected to the holding piece (50) from the undercut portion (P1) intersecting the die-cutting direction. An operating piece (60), a connecting member (70) provided on the escape operating piece (60) and extending in an inclined manner, and the connecting member (70) passing through the wall surface (44) of the holder (40). An undercut molding part (80) provided on the extending tip side (72),
One of the holder (40) and the escape operation piece (60) is provided with an obliquely extending oblique groove (45), and the other is slidably fitted into the oblique groove (45). An oblique line (62) is provided, and a guide hole (46) is formed in the wall surface (44) of the holder (40) so that the connecting member (70) can be moved in a tilted state. And
When the holding piece (50) moves in the mold release direction with the ejecting operation of the ejector pin (21), the escape piece (60) and the connecting member (70) pushed by the holding piece (50) and driven. ), The undercut molding part (80) moves in the die-cutting direction and moves in the relief direction, and the molding product (P) is set to be die-cuttable. (20).

[2] The molded product (P) including the undercut portion (P1) can be formed by the fixed die (11) and the movable die (12), and the undercut portion ( In the mold apparatus (20) that can be released from P1),
An ejector pin (21) which is driven in a die-cutting direction and protrudes, and an undercut punching device (30) provided on the tip side (23) of the ejector pin (21),
The undercut punching device (30) is provided on the distal end side (23) of the ejector pin (21), and is arranged to be slidable in the punching direction within the hollow portion of the movable die (12). (50), an escape operation piece (60) connected to the holding piece (50) so as to be slidable in an escape direction from the undercut portion (P1) intersecting the die-cutting direction, and the escape operation piece (60) And a connecting member (70) extending in an inclined manner, and an undercut molding part (80) provided on the tip side where the connecting member (70) extends through the wall surface of the movable mold (12). Comprising
One of the hollow part of the movable mold (12) and the escape operation piece (60) is provided with a slanting groove (45) extending obliquely, and the other is slidable in the slanting groove (45). A guide hole (46) that is provided with a slanted line (62) that fits into the movable mold (12) and that is guided so as to be movable in a state in which the connecting member (70) is inclined through the wall surface of the movable mold (12). Formed,
When the holding piece (50) moves in the mold release direction with the ejecting operation of the ejector pin (21), the escape piece (60) and the connecting member (70) pushed by the holding piece (50) and driven. ), The undercut molding part (80) moves in the die-cutting direction and moves in the relief direction, and the molding product (P) is set to be die-cuttable. (20).

[3] In the thing which requires a relief operation in both directions opposite to the undercut portion (P1), the relief operation piece (60A), the connecting member (70A), and the undercut molding portion (80A) are respectively A pair is placed facing each other symmetrically,
When the holding piece (50A) moves in the die-release direction along with the ejecting operation of the ejector pin (21), each of the escaping pieces (60A) and the connecting members (70A) that are pushed by the holding piece (50A) and follow. ), Each undercut molding part (80A) moves in the die-cutting direction and moves in the direction opposite to each other, so that the molded product (P) can be die-cut. The molding die apparatus (20A) according to [1] or [2].

[4] In the thing which requires a relief operation in both directions opposite to the undercut portion (P1), the relief operation piece (60A), the connecting member (70A), and the undercut molding portion (80A) are respectively A plurality of pairs are arranged as a pair, facing each other symmetrically,
When the holding piece (50A) moves in the die-release direction along with the ejecting operation of the ejector pin (21), each of the escaping pieces (60A) and the connecting members (70A) that are pushed by the holding piece (50A) and follow. ), Each undercut molding part (80A) moves in the die-cutting direction and moves in the direction opposite to each other, so that the molded product (P) can be die-cut. The molding die apparatus (20A) according to [3].

[5] In the case where each of the undercut portions (P2, P3) requires a relief operation in one direction, the relief operation piece (60B), the connecting member (70B), and the undercut molding portions (80B1, 80B2) Are arranged next to each other in the same direction,
When the pair of holding pieces (50B) move in the die-release direction as the ejector pin (21) protrudes, the relief action pieces (60B) and the connecting members that are pushed and driven by the holding pieces (50B). (70B), each undercut molding part (80B1, 80B2) moves in the die-cutting direction and moves in the relief direction, which is the same direction, so that the molded product (P) can be die-cut. The molding die apparatus (20B) according to [1] or [2], characterized in that:

[6] In the case where each of the undercut portions (P2, P3) requires a relief operation in one direction, the relief operation piece (60B), the connecting member (70B), and the undercut molding portions (80B1, 80B2) A plurality of pairs arranged as a pair each adjacent to each other in the same direction,
When the holding piece (50B) moves in the die-release direction along with the ejecting operation of the ejector pin (21), the relief action pieces (60B) and the connecting members (70B) that are pushed by the holding piece (50B) and follow. ), Each undercut molding part (80B1, 80B2) moves in the die-cutting direction and also moves in the same relief direction so that the molded product (P) can be die-cut. The molding die apparatus (20B) according to [5].

[7] In the molded product (P) in which the reference surface of the molded product (P) is inclined with respect to the horizontal plane, and the escape direction from the undercut portion (P1) is also inclined,
[1], [2], [3], [3], [3], [3], [3], [3], [3], [3] 4], [5] or [6]. A molding die apparatus (20, 20A, 20B).

  [8] The holding pieces (50, 50A, 50B) are integrally provided on the distal end side (23) of the ejector pin (21), [1], [2], [3], [ 4], [5], [6], or [7], the molding die apparatus (20, 20A, 20B).

  [9] The molding metal as set forth in [8], wherein the holding pieces (50, 50A, 50B) are integrally provided in a substantially T-shape on the tip side (23) of the ejector pin (21). Mold device (20, 20A, 20B).

  [10] The connecting member (70, 70A, 70B) is set to a length corresponding to the punching stroke of the molded product (P) [1], [2], [3] , [4], [5], [6], [7], [8] or [9] The molding mold apparatus (20, 20A, 20B).

  [11] The relief operation pieces (60, 60A, 60B) are integrally provided on the base end side of the connecting members (70, 70A, 70B). [1], [2], [3 ], [4], [5], [6], [7], [8], [9] or [10], the molding die apparatus (20, 20A, 20B).

The present invention operates as follows.
According to the molding die device (20) according to the present invention, the undercut punching device (30) for releasing from the undercut portion (P1) during the punching operation in the molding step of the molded product (P). The central plate is arranged only on the movable die (12) without being dispersed on the ejector base plate (13) or the movable die (12). As a result, it is possible to make the device compact, and it is possible to meet the demand for space saving, and processing and incorporation into the molding die (10) are facilitated.

  The undercut punching device (30) is provided on the tip side (23) of the ejector pin (21), and operates in accordance with the ejecting operation of the ejector pin (21) driven in the die-cutting direction during the die-cutting operation. 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 (P) appears. Next, the ejector pin (21) protrudes so as to separate the molded product (P) from the movable die (12) for die cutting.

  In the undercut punching device (30), the holding piece (50) provided on the distal end side (23) of the ejector pin (21) in the holder (40) accommodated in the movable mold (12) is provided with the holder (40). 40) slides in the die-cutting direction. Along with the holding piece (50), the escaping piece (60) provided on the holding piece (50) so as to be slidable in the escaping direction intersecting the die-cutting direction also moves, and the holder (40) and the escaping piece ( 60).

  Due to the slanting grooves (45) or the slanting ridges (62) provided in the holder (40) and the relieving motioning piece (60), the relieving motioning piece (60) is slid into the slanting groove (45) or the sloping ridge (62). The escape operation piece (60) moves in the escape direction from the undercut portion (P1) while being guided while being movably fitted. Further, the connecting member (70) provided on the escape operation piece (60) and extending obliquely moves so as to be inclined through the guide hole (46) in the wall surface (44) of the holder (40). Be guided to.

  In this way, when the holding piece (50) moves in the die-release direction along with the ejecting operation of the ejector pin (21) during the die-cutting operation, the escape-action piece (60) that is pushed and driven by the holding piece (50). ) And the connecting member (70), the undercut molding part (80) moves in the die-cutting direction and moves in the escape direction, and the molded product (P) can be die-cut.

  The movement of the undercut molding part (80) is caused by the fitting relationship between the oblique groove (45) and the oblique line (62) provided in the holder (40) and the relief operation piece (60), and the wall surface of the holder (40). Since it is guided by the sliding of the connecting member (70) penetrating the guide hole (46) of (44), the load during the die-cutting operation is dispersed without being concentrated in one place, so the durability is improved. It is done. In addition, since high accuracy is reduced at the time of design, cost can be reduced.

  When the molded product (P) is removed, as the ejector pin (21) returns to the molding position, it is pulled by the escape action piece (60), and the connecting member (70) and the undercut molded part (80) are also in the initial stage. Return to position. In addition, the movable mold (12) also returns to the molding position, and the next molded product (P) is molded.

  Further, a space similar to the inside of the holder (40) may be configured as a space in the hollow portion of the movable mold (12) without accommodating the holder (40) which is a separate part in the movable mold (12). good. In this case, a slant groove (45) is provided in one of the hollow portion of the movable mold (12) and the escape operation piece (60), and the slant groove slidably fitted in the slant groove (45). A guide hole (46) is provided on the wall surface of the movable mold (12) provided with the strip (62) and guided so as to be movable in a state where the connecting member (70) is inclined through. This eliminates the need for the holder (40), reduces the number of parts, further simplifies the overall configuration of the molding die device (20), and reduces the cost.

  In the molding die device (20A) for the molded product (P) that requires the relief operation in both directions opposite from the undercut portion (P1), the relief operation piece (60A), the connecting member (70A), A pair of cut forming portions (80A) are arranged symmetrically facing each other, and the holding piece (50A) moves in the die-cutting direction as the ejector pin (21) protrudes during the die-cutting operation. Then, each undercut forming part (80A) moves in the die-cutting direction through each relief action piece (60A) and each connecting member (70A) that are pushed and driven by the holding piece (50A) and mutually moves. The molded product (P) can be punched by moving in the escape direction which is the opposite direction.

  The escape operation piece (60A), the connecting member (70A), and the undercut molding part (80A) are configured so that a plurality of pairs are arranged in one device, with each pair facing each other symmetrically. May be. Accordingly, a molded product (P) including a plurality of sets of undercut portions (P2, P3) that require relief operations in opposite directions, or a plurality of molded products including a set of undercut portions (P1) ( P) can also be molded very simply and inexpensively.

  Further, in the molding die device (20B) for the molded product (P) that requires a relief operation in one direction from the undercut portions (P2, P3), the relief operation piece (60B) and the connecting member (70B) , And a pair of undercut forming portions (80B1, 80B2) are arranged adjacent to each other in the same direction, and the holding piece (50B) is formed by the ejecting operation of the ejector pin (21) during the die-cutting operation. When moved in the punching direction, each undercut molding part (80B1, 80B2) is moved in the die-cutting direction via each relief operation piece (60B) and each connecting member (70B) that are pushed and driven by the holding piece (50B). The molded product (P) can be punched out by moving in the escape direction which is the same direction as each other.

  Even in such a case, the escape operation piece (60B), the connecting member (70B), and the undercut molding parts (80B1, 80B2) are arranged in pairs, each paired adjacent in the same direction, A plurality of sets may be arranged in one apparatus. Thereby, a molded product (P) including a plurality of sets of undercut portions (P2, P3) each requiring relief operation in one direction, or a plurality of molded products (P) including a set of undercut portions (P1). ) Can be molded very easily and inexpensively.

  Furthermore, in the molding die device (20) for the molded product (P) in which the escape direction from the undercut part (P1) is also inclined by the reference plane of the molded product (P) being inclined with respect to the horizontal plane It is possible to cope with this by making the sliding direction of the escape operation piece (60, 60A, 60B) relative to the holding piece (50, 50A, 50B) coincide with the escape direction. Thereby, the processing of the movable mold (12) becomes very easy and can be manufactured easily and inexpensively.

  The holding pieces (50, 50A, 50B) can be integrally formed on the tip side (23) of the ejector pin (21), and the structure is simple and the cost can be reduced. In particular, the holding piece (50, 50A, 50B) may be integrally provided in a substantially T shape on the tip side (23) of the ejector pin (21). Moreover, what is necessary is just to set the connection member (70, 70A, 70B) to the length according to a stroke, when the stroke | die cutting stroke of a molded article (P) is large. Further, the escape operation piece (60, 60A, 60B) can be integrally provided on the base end side of the connecting member (70, 70A, 70B), and the structure is simple and the cost can be reduced.

  According to the undercut punching device according to the present invention, since the required undercut punching mechanism is integrated in the movable mold (inside the holder accommodated therein), the mold configuration can be reduced in size. At the same time, the angular pin and loose core mechanism used in the conventional undercut punching method are no longer required, and the tilting process on the mold body associated with the installation of the angular pin and loose core mechanism is eliminated, thereby reducing the mold manufacturing cost. be able to. In addition, if a molded product is manufactured by this undercut punching device, a product with reduced cost of the mold can be supplied to the market.

  In addition, the movement of the undercut molding part is determined by the connection between the holder (or movable type) and the slant groove and the ridge provided in the escape operation piece, and the connecting member for the guide hole on the wall surface of the holder (or movable type). Since the load is guided without being concentrated in one place, the durability is improved. Further, since high accuracy at the time of design is eased, further cost reduction is possible.

Hereinafter, various preferred embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment of the present invention.
FIG. 1 is a cross-sectional view showing the main parts for explaining the operation of the molding die apparatus 20 according to the first embodiment of the present invention. FIG. 2 is a perspective view showing an undercut punching device 30 included in the molding die device 20, and FIG. 3 is an exploded perspective view showing the undercut punching device 30. As shown in FIG.

  As shown in FIG. 1, the molding die device 20 can be released from the undercut portion P1 included in the molded product P when the molded product P such as resin or metal molded by the molding die 10 is released. It is a mechanism for. The molding die 10 includes a fixed mold 11 that mainly molds an appearance portion of a molded product, a movable mold 12 that mainly molds an inner surface of the molded product, and an ejector base plate 13 that is driven in the vertical direction. .

  The molding die device 20 includes an ejector pin 21 that is driven in the die-cutting direction as the ejector base plate 13 is moved up and down, and an undercut punching device 30 that is provided on the distal end side 23 of the ejector pin 21. Have. An undercut punching device 30 provided at the distal end side 23 of the ejector pin 21, with the base end side 22 of the ejector pin 21 fixed to the ejector base plate 13 with a knock pin 22 a so that the ejector pin 21 protrudes in the mold release direction. Is provided on the movable mold 12.

  The undercut punching device 30 includes a holder 40 housed in the movable mold 12 and a holding piece 50 provided on the distal end side 23 of the ejector pin 21 so as to be slidable in the punching direction within the holder 40. An escape operation piece 60 that is slidably connected to the holding piece 50 in an escape direction from the undercut portion P1 that intersects the die-cutting direction, and a slide that is provided on the escape operation piece 60 and extends in an inclined manner. A pin (connecting member) 70 and an undercut forming portion 80 provided on the distal end side 72 where the sliding pin 70 extends through the upper wall surface (wall surface) 44 of the holder 40 are provided.

  As shown in FIG. 1, the holder 40 is fixed via an attachment piece 49 screwed to the lower end surface of the movable mold 12 while being accommodated in the movable mold 12. As shown in FIG. 2 and FIG. 3A, the holder 40 includes both side wall portions 41 and 41 whose lower end edge side is fitted to the mounting piece 49, a front wall portion 42, a rear wall portion 43, and an upper wall surface portion 44. Thus, it is assembled in a box shape with the lower end surface side opened.

  The front wall 42 and the rear wall 43 of the holder 40 are each provided with a slanting groove 45 extending in an inclined manner, and the escape operation piece 60 described later is slidably fitted into the slanting groove 45. An oblique line 62 is provided so as to protrude. The oblique groove 45 may be provided in either the holder 40 or the holding piece 50, and the oblique line 62 may be provided on the other side. In short, it is only necessary that the escape operation piece 60 is configured to be movable in the escape direction from the undercut portion P1 during the die cutting operation.

  A guide hole 46 is formed in the upper wall surface 44 of the holder 40 so as to be movably guided in a state where a slide pin 70 described later penetrates and tilts. Here, the inclination angle of the sliding pin 70, that is, the inclination angle on the inner peripheral surface of the guide hole 46 coincides with the inclination angle of the oblique groove 45 and the oblique stripe 62.

  As shown in FIG. 1, the holding piece 50 is provided on the distal end side 23 of the ejector pin 21 and is slidable in the mold release direction within the holder 40. On the upper end surface side of the holding piece 50, a ridge 51 is formed for slidably connecting a relief action piece 60 described below in a relief direction (left and right direction) from the undercut portion P1 intersecting with the die cutting direction. Has been.

  As shown in FIG. 3C, in this embodiment, the holding piece 50 is provided separately from the ejector pin 21 and connected later, but the holding piece 50 is connected to the distal end side 23 of the ejector pin 21. You may provide integrally. Here, the holding piece 50 may be integrally provided in a substantially T shape on the distal end side 23 of the ejector pin 21.

  As shown in FIG. 2B and FIG. 3B, a dovetail groove 61 is formed on the lower end surface side of the escaping piece 60 so as to be movably fitted to the ridge 51 of the holding piece 50. The escape operation piece 60 is connected to the holding piece 50 so as to be slidable in the escape direction from the undercut portion P1 that intersects the die-cutting direction. Further, on the front and rear surface portions of the escape operation piece 60, oblique stripes 62 are provided so as to be slidably fitted into the oblique grooves 45 of the holder 40, respectively. Here, the oblique stripes 62 are inclined in the same direction as the oblique grooves 45.

  As shown in FIGS. 1 and 3C, the lower end side 71 of the sliding pin 70 is fixed to the upper end surface side of the escape operation piece 60 in a state where the sliding pin 70 extends in an inclined manner. . Here, the sliding pin 70 is inclined in the same direction as the oblique groove 45 and the oblique stripe 62. As shown in FIGS. 1, 2, and 3 (b), the distal end 72 of the sliding pin 70 extends upward through the guide hole 46 in the upper wall surface 44 of the holder 40. The undercut molding portion 80 for molding the undercut portion P1 of the molded product P is integrally connected to the distal end side 72.

  According to the molding die device 20 as described above, as shown in FIG. 1, when the holding piece 50 moves in the die-cutting direction as the ejector pin 21 protrudes, the holding piece 50 is pushed. The undercut molding portion 80 moves in the die-cutting direction and moves in the relief direction via the driven relief piece 60 and the sliding pin 70, so that the molded product P can be die-cut. .

Next, the operation of the molding die apparatus 20 according to the first embodiment will be described.
According to the mold apparatus 20 for molding, the undercut punching device 30 for releasing from the undercut portion P1 is dispersed to the ejector base plate 13 and the movable mold 12 during the punching operation in the molding process of the molded product P. Without being concentrated, only the movable mold 12 is disposed. 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.

  Fig.1 (a) has shown the state which shaping | molding of the molded article P was completed. When molding is finished and the fixed mold 11 is separated from the movable mold 12, one side (appearance portion) of the molded product P appears. Next, when the ejector base plate 13 is driven upward, the distal end side 23 of the ejector pin 21 that is fixed so that the base end side 22 can protrude in the mold-release direction from the ejector base plate 13 corresponds to the movement. Ejects straight in the direction of mold release.

  As shown in FIG. 1B, in the undercut punching device 30, the holding piece 50 provided on the distal end side 23 of the ejector pin 21 in the holder 40 accommodated in the movable mold 12 is provided in the holder 40. Slides in the direction of mold release. Along with the holding piece 50, the escaping piece 60 connected to the holding piece 50 so as to be movable in the flank direction intersecting the die-cutting direction also moves, so that the holder 40 and the escaping piece 60 are relatively displaced.

  The escape operation piece 60 is slidably fitted to the oblique groove 45 or the oblique line 62 and guided by the oblique groove 45 or the oblique line 62 provided in the holder 40 and the escape operation piece 60, while being escaped. 60 moves in the direction of escape from the undercut portion P1. Further, the connecting member 70 that is solidified by the escape operation piece 60 and extends at an inclination is guided so as to move in an inclined state through the guide hole 46 in the upper wall surface 44 of the holder 40.

  As shown in FIG. 1 (b), when the holding piece 50 moves in the die-release direction as the ejector pin 21 protrudes during the die-cutting operation, the escape piece 60 and the connecting piece that are pushed and driven by the holding piece 50 are connected. Through the member 70, the undercut molding part 80 moves in the die-cutting direction and also moves in the escape direction from the undercut part P1, so that the molded product P can be die-cut.

  The movement of the undercut forming part 80 is caused by the fitting relationship between the oblique groove 45 and the oblique stripe 62 provided in the holder 40 and the escape operation piece 60 and the connecting member penetrating through the guide hole 46 of the upper wall surface part 44 of the holder 40. Since it is guided by the sliding of 70, the load during the die-cutting operation is dispersed without being concentrated in one place, so that the durability is improved. In addition, since high accuracy is reduced at the time of design, cost can be reduced.

  When the molded product P is removed, as the ejector pin 21 returns to the position at the time of molding, the slidable pin 70 and the undercut molded part 80 are also returned to the initial position by being pulled by the escape operation piece 60. Further, the movable mold 12 also returns to the molding position, and the next molded product P is molded. In addition, when the punching stroke of the molded product P is large, the holder 40 and the escape operation piece 60 are set to a length corresponding to the stroke.

  Further, in the present embodiment, as shown in FIG. 3C, the holding piece 50 is provided separately from the ejector pin 21 and connected later, but the holding piece 50 is connected to the front end side of the ejector pin 21. 23 may be integrally provided in advance. Thereby, the structure is simple and the cost can be reduced. In particular, the holding piece 50 may be integrally provided in a substantially T shape on the distal end side 23 of the ejector pin 21.

4 to 7 show a second embodiment of the present invention.
The present embodiment is a molding die device 20A corresponding to a molded product P (see FIG. 6C) that requires a relief operation in both directions opposite to the undercut portion P1. As shown in FIG. 4, in the case that requires a relief operation in opposite directions, a pair of relief operation pieces 60 </ b> A, a connecting member 70 </ b> A, and an undercut molding portion 80 </ b> A are arranged facing each other symmetrically.

  When the holding piece 50A moves in the direction of die removal along with the ejecting operation of the ejector pin 21 during the die cutting operation, the molding die device 20A is pushed by the holding piece 50A to follow each relief operation piece 60A. Each undercut forming portion 80A moves in the die-cutting direction via each connecting member 70A and moves in the escape direction which is opposite to each other, so that the molded product P can be die-cut. In addition, the same code | symbol is attached | subjected to the site | part same as 1st Embodiment, and the overlapping description is abbreviate | omitted. The same applies to the following embodiments.

  Further, in the molding die apparatus 20A, the relief operation piece 60A, the connecting member 70A, and the undercut molding portion 80A are respectively left and right as shown in FIGS. A plurality of pairs of symmetrically facing pairs are arranged as one set. As a result, when the holding piece 50A moves in the mold release direction as the ejector pin 21 protrudes, each undercut molding is carried out via each relief operation piece 60A and each connecting member 70A which are pushed and driven by the holding piece 50A. The part 80A moves in the die-cutting direction and moves in the escape direction opposite to each other, so that a plurality of molded products P can be die-cut at a time.

  Specifically, as shown in FIG. 5, two ejector pins 21 are erected in parallel at an interval on the ejector base plate 13, and as shown in FIG. 7, the tip side of each ejector pin 21. 23, holding pieces 50A are provided so as to extend in a T-shape. Each holding piece 50A is slidably connected in a relief direction intersecting with the die-cutting direction in a state where a pair of relief operation pieces 60A is bridged.

  As shown in FIG. 7, on the upper end surface side of each holding piece 50 </ b> A, a ridge 51 is formed for slidably connecting each escaping piece 60 </ b> A in the escaping direction (left-right direction) intersecting the die-cutting direction. Has been. A dovetail groove 61 is formed on the lower end surface side of each end of each escape operation piece 60A so as to be movably fitted to the protrusion 51 of each holding piece 50A.

  Each escape operation piece 60A is formed by integrally connecting escape operation pieces 60A corresponding to five sets of connecting members 70A, and the upper surface side of each escape operation piece 60A is inclined upward. Five extending connecting members 70A are fixed at regular intervals. In addition, ridges 62 are provided on the front and rear end surfaces of each escape operation piece 60A. Here, the ridge 62 is inclined in the same direction as the connecting member 70A.

  The holder 40A is formed in a size that can accommodate the pair of holding pieces 50A, the pair of escape operation pieces 60A, and the connecting members 70A. The holder 40A includes a front wall 42 and a rear wall 43 respectively. A pair of inclined grooves 45 extending obliquely facing each other are recessed. Further, the upper wall surface portion 44 of the holder 40A constitutes a part (core) of the movable mold 12 that forms the inner surface of the molded product P, and each connecting member 70A penetrates the upper wall surface portion 44. A plurality of guide holes 46 that are movably guided in an inclined state are formed. An undercut molding portion 80A is integrally provided on the distal end side 72 where each connecting member 70A extends through the guide hole 46.

  As described above, in the molding die apparatus 20A for the molded product P that requires the relief operation in both directions opposite to each other, the relief operation piece 60A, the slide pin 70A, and the undercut molding part 80A are respectively left and right. A pair of symmetrically opposed members is provided, and when the holding piece 50A moves in the direction of die removal along with the ejecting operation of the ejector pin 21 at the time of the die removal operation, each escape operation piece pushed by the holding piece 50 and driven. Each undercut molding part 80A moves in the die-cutting direction via 60A and each sliding pin 70A, and also moves in the escape direction which is opposite to each other, so that the molded product P can be die-cut.

  In addition, the sliding pin 70A and the undercut forming portion 80A are configured to be arranged in a plurality of sets in one device, with each pair facing each other in a symmetrical manner. A plurality of molded articles P each including a set of undercut portions P1 that require operation can be molded extremely simply and inexpensively.

8 to 11 show a third embodiment of the present invention.
The present embodiment is a molding die apparatus 20B corresponding to a molded product P (see FIG. 8B) that requires a relief operation in one direction from the undercut portions P2 and P3. As shown in FIG. 8, in each of which requires a relief operation in one direction, a pair of relief operation pieces 60 </ b> B, connecting members 70 </ b> B, and undercut forming portions 80 </ b> B <b> 1 and 80 </ b> B <b> 2 are arranged adjacent to each other in the same direction. .

  When the holding piece 50B moves in the direction of die removal along with the ejecting operation of the ejector pin 21 during the die removal operation, the molding die device 20B is pushed by the holding piece 50B and is driven by the relief operation pieces 60B. Each undercut molding part 80B1, 80B2 moves in the die-cutting direction via each connecting member 70B, and also moves in the relief direction which is the same direction, so that the molded product P can be die-cut.

  Furthermore, in the molding die apparatus 20B, the relief operation piece 60B, the connecting member 70B, and the undercut molding portions 80B1 and 80B2 are arranged as shown in FIGS. A plurality of pairs are arranged as a pair each adjacent to each other in the same direction. As a result, when the holding piece 50B moves in the die-release direction along with the ejecting operation of the ejector pin 21, each undercut molding is carried out via each escaping piece 60B and each connecting member 70B which are pushed and driven by the holding piece 50B. The parts 80B1 and 80B2 move in the die-cutting direction and move in the same relief direction so that a plurality of molded products P can be die-cut at a time.

  Specifically, as shown in FIG. 9, two ejector pins 21 are erected in parallel on the ejector base plate 13 with a space therebetween, and each ejector pin 21 has a T-shape on the tip side 23. A holding piece 50B is provided to extend. Each holding piece 50B is provided so as to be slidable in the escape direction intersecting the die-cutting direction in a state where a pair of escape operation pieces 60B are bridged.

  As shown in FIG. 11, on the upper end surface side of each holding piece 50B, a ridge 51 is formed for slidably connecting each relief operation piece 60B in the relief direction (left-right direction) intersecting the die-cutting direction. Has been. A dovetail groove 61 is formed on the lower end surface side of each escape operation piece 60B. The dovetail groove 61 is movably fitted to the protrusion 51 of each holding piece 50B.

  Each escape operation piece 60B is provided by integrally connecting escape operation pieces corresponding to five sets of connecting members 70B, and extends upwardly on the upper surface side of each escape operation piece 60B. Five connecting members 70B are consolidated at equal intervals. In addition, ridges 62 are respectively provided on the front and rear surface portions of each escape operation piece 60B. Here, the oblique stripes 62 are inclined in the same direction as the connecting member 70B.

  Here, the inclination of each connecting member 70B and the ridge 62 fixed to one escape operation piece 60B of the pair and each connection member 70B and the ridge 62 fixed to the other escape operation piece 60B is as follows. These are in the same direction but have a slightly different inclination angle. These inclinations are set based on the difference in the punching strokes of the corresponding undercut portions P2, P3. Further, the shapes of the undercut molded portions 80B1 and 80B2 are slightly different depending on the undercut portions P2 and P3.

  The holder 40B is formed in a size that can accommodate the pair of holding pieces 50B, the pair of escape operation pieces 60B, and the connecting members 70B. The front wall portion 42 and the rear wall portion 43 of the holder 40B are respectively provided with A pair of inclined grooves 45 extending obliquely facing each other are recessed. Further, the upper wall surface portion 44 of the holder 40B constitutes a part (core) of the movable mold 12 that forms the inner surface of the molded product P, and each connecting member 70B passes through the upper wall surface portion 44. A plurality of guide holes 46 that are movably guided in an inclined state are formed. Undercut molding portions 80B1 and 80B2 are integrally provided on the distal end side 72 where each connecting member 70B extends through the guide hole 46, respectively.

  As described above, in the molding die apparatus 20B for the molded product P that requires the relief operation in one direction, the relief operation piece 60B, the slide pin 70B, and the undercut molding portions 80B1 and 80B2 are respectively provided. A pair is arranged adjacent to each other in the same direction, and when each holding piece 50B moves in the die-cutting direction in accordance with the ejecting operation of the ejector pin 21 during the die-cutting operation, each relief that is pushed by each holding piece 50B and follows. The undercut molding portions 80B1 and 80B2 move in the die-cutting direction and move in the same relief direction through the operation piece 60B and the sliding pins 70B, respectively, and the molded product P can be die-cut. it can.

  In addition, the sliding pin 70B and the undercut forming portions 80B1 and 80B2 are arranged in a single device so that a pair of adjacent pairs in the same direction are arranged in one direction, each in one direction. A molded product P including a plurality of sets of undercut portions P2 and P3 that require escape operation can be molded extremely simply and inexpensively.

  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 shape of the molded product P is not limited to that shown in the figure. In the second embodiment, the undercut portions P1 on both sides are symmetrical, but the undercut portions having different shapes on both sides are provided. It can also be applied to. In the third embodiment, the undercut portions P2 and P3 on both sides have different shapes, but the present invention can be applied to undercut portions having the same shape on both sides.

  Although not shown in the drawings, in the case of molding a molded product in which the relief direction from the undercut portion is also inclined by inclining the reference surface of the molded product with respect to the horizontal plane, This can be dealt with by matching the sliding direction to the escape direction. Thereby, the process of the movable mold | type 12 becomes very easy, and it can manufacture simply and cheaply.

  Further, a space similar to the inside of the holders 40, 40 </ b> A, 40 </ b> B may be configured as a space in the hollow portion of the movable mold 12 without accommodating the holders 40, 40 </ b> A, 40 </ b> B which are separate parts in the movable mold 12. good. In this case, a slant groove 45 is provided in one of the hollow portion of the movable mold 12 and the relief operation pieces 60, 60A, 60B, and a slant ridge 62 that is slidably fitted in the slant groove 45 is provided in the other. In addition, a guide hole 46 is formed in the movable mold 12 itself so that the connecting members 70, 70A, 70B are guided so as to be movable in a state where the connecting members 70, 70A, 70B are inclined.

  This eliminates the need for the holders 40, 40A, 40B, reduces the number of parts, further simplifies the overall configuration of the molding die apparatuses 20, 20A, 20B, and reduces costs. It becomes. The escape operation pieces 60, 60A, 60B can be integrally provided on the base end side of the connecting members 70, 70A, 70B, and the structure is simple and the cost can be reduced.

It is sectional 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 a perspective view which shows the undercut punching device which the molding die apparatus which concerns on the 1st Embodiment of this invention has. It is a disassembled perspective view which shows the undercut removal apparatus which the molding die apparatus which concerns on the 1st Embodiment of this invention has. It is sectional 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 sectional drawing which shows the state which looked at Fig.4 (a) from the right side. It is a perspective view which shows the undercut punching device which the molding die apparatus which concerns on the 2nd Embodiment of this invention has. It is a disassembled perspective view which shows the undercut punching device which the molding die apparatus which concerns on the 2nd Embodiment of this invention has. It is sectional 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 sectional drawing which shows the state which looked at Fig.8 (a) from the right side. It is a perspective view which shows the undercut punching device which the molding die apparatus which concerns on the 3rd Embodiment of this invention has. It is a disassembled perspective view which shows the undercut punching device which the molding die apparatus which concerns on the 3rd Embodiment of this invention has.

Explanation of symbols

P ... Molded product P1 ... Under cut part P2 ... Under cut part P3 ... Under cut part 10 ... Molding mold 11 ... Fixed mold 12 ... Movable mold 13 ... Ejector base plate 20 ... Molding mold apparatus 20A ... Molding mold Device 20B ... Molding die device 21 ... Ejector pin 30 ... Undercut punching device 40 ... Holder 41 ... Side wall portion 42 ... Front wall portion 43 ... Rear wall portion 44 ... Upper wall portion 45 ... Slanted groove 46 ... Guide hole 49 ... Mounting piece 50 ... Holding piece 50A ... Holding piece 50B ... Holding piece 51 ... Convex strip 60 ... Relief action piece 60A ... Relief action piece 60B ... Escape action piece 61 ... Dovetail groove 62 ... Oblique stripe 70 ... Sliding pin 70A ... Connecting member 70B ... Connecting member 80 ... Undercut molded part 80A ... Undercut molded part 80B1, 80B2 ... Undercut molded part

Claims (11)

In a molding die apparatus that can mold a molded product including an undercut portion with a fixed mold and a movable mold, and can be released from the undercut portion when the molded product is die-cut,
An ejector pin that is driven in the die-cutting direction to project and an undercut punching device provided on the tip side of the ejector pin;
The undercut punching device includes a holder housed in the movable mold, a holding piece provided on a tip end side of the ejector pin and arranged to be slidable in the die cutting direction in the holder, and the holding piece A relief operation piece that is slidably connected in an escape direction from an undercut portion that intersects the die-cutting direction, a connection member that is provided on the escape operation piece and extends at an inclination, and the connection member is provided on the holder. Comprising an undercut molding part provided on the tip side extending through the wall surface,
One of the holder and the escape operation piece is provided with a slanting groove extending obliquely, and the other is provided with a sloping slidably fitting into the slanting groove, and on the wall surface of the holder. Is formed with a guide hole that is movably guided in a state where the connecting member penetrates and is inclined,
When the holding piece moves in the die-cutting direction in accordance with the ejecting operation of the ejector pin, the undercut molding part is moved in the die-cutting direction via the relief piece and the connecting member that are pushed and driven by the holding piece. A mold apparatus for molding, wherein the mold apparatus is set so that it can be removed by moving in the escape direction. In a molding die apparatus that can mold a molded product including an undercut portion with a fixed mold and a movable mold, and can be released from the undercut portion when the molded product is die-cut,
An ejector pin that is driven in the die-cutting direction to project and an undercut punching device provided on the tip side of the ejector pin;
The undercut punching device is provided on the tip end side of the ejector pin, and is arranged so as to be slidable in the mold release direction within the hollow portion of the movable mold, and intersects the mold release direction with the holding piece. An escape operation piece that is slidably connected in an escape direction from the undercut portion, a connection member that is provided on the escape operation piece and extends at an inclination, and the connection member extends through the movable wall surface. Comprising an undercut molding part provided on the leading end side,
One of the movable hollow portion and the escape operation piece is provided with a slanting groove extending obliquely, and the other is provided with a sloping slidably fitting into the slanting groove, and In the movable wall surface, a guide hole is formed that is guided so as to be movable in a state where the connecting member penetrates and is inclined,
When the holding piece moves in the die-cutting direction in accordance with the ejecting operation of the ejector pin, the undercut molding part is moved in the die-cutting direction via the relief piece and the connecting member that are pushed and driven by the holding piece. A mold apparatus for molding, wherein the mold apparatus is set so that it can be removed by moving in the escape direction. In those requiring a relief operation in both directions opposite from the undercut portion, the escape operation piece, the connecting member, and the undercut molding portion are arranged in a pair so as to face each other symmetrically,
When the pair of holding pieces move in the die-cutting direction as the ejector pin protrudes, each undercut forming portion is die-cut through the relief piece and the connecting member that are pushed and driven by the holding pieces. The molding die apparatus according to claim 1 or 2, wherein the molding device is set so that the molded product can be punched by moving in a direction and an escape direction opposite to each other. In a configuration that requires a relief operation in both directions opposite to the undercut portion, a plurality of the escape operation pieces, the connecting member, and the undercut forming portion are arranged in pairs, each pair facing each other in a symmetrical manner. Set up
When the holding piece moves in the die-cutting direction in accordance with the ejecting operation of the ejector pin, each undercut forming portion is moved in the die-cutting direction via each relief piece and the connecting member that are pushed and driven by the holding piece. 4. The molding die apparatus according to claim 3, wherein the molding device is set so that the molded product can be punched by moving in an escape direction opposite to each other. In the one that requires a relief operation in one direction from each of the undercut parts, the escape operation piece, the connecting member, and the undercut molding part are arranged in a pair adjacent to each other in the same direction,
When the pair of holding pieces move in the die-cutting direction as the ejector pin protrudes, each undercut forming portion is die-cut through the relief piece and the connecting member that are pushed and driven by the holding pieces. The molding die apparatus according to claim 1 or 2, wherein the molding device is set so that the molded product can be punched by moving in the same direction and moving in the same direction. In the case where a relief operation is required in each direction from the undercut portion, a plurality of sets of the escape operation piece, the connecting member, and the undercut molding portion are arranged as a pair each adjacent to each other in the same direction. And
When the holding piece moves in the die-cutting direction in accordance with the ejecting operation of the ejector pin, each undercut forming portion is moved in the die-cutting direction via each relief piece and the connecting member that are pushed and driven by the holding piece. 6. The molding die apparatus according to claim 5, wherein the molding device is set so that the molded product can be punched by moving in the same relief direction. In molding a molded product in which the reference plane of the molded product is inclined with respect to a horizontal plane and the escape direction from the undercut portion is also inclined,
7. The molding die apparatus according to claim 1, wherein a sliding direction of the escape operation piece with respect to the holding piece is matched with the escape direction.   The molding die device according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the holding piece is integrally provided on a tip end side of the ejector pin.   9. The molding die apparatus according to claim 8, wherein the holding piece is integrally provided in a substantially T shape on the tip end side of the ejector pin.   10. The molding according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, wherein the connecting member is set to a length corresponding to a punching stroke of the molded product. Mold equipment.   11. The molding metal according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, wherein the escape piece is integrally provided on a proximal end side of the connecting member. Mold device.

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