JP2011218704A - Undercut processing mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an undercut processing mechanism which can easily remove an undercut part from a mold even when an undercut part protruding inside a molding lower face has a rugged shape toward right and left sides crossing a mold removal direction.SOLUTION: In a holder 30 provided in a mobile mold 13, a holding piece 40 supported by an ejector pin 20 and respective molding cores 60 arranged outside the holder 30 are connectively supported by a pair of connecting members 51, 52 and respective connecting members 51, 52 are guided in the mold removal direction along inclined grooves 34, 35 which are guide means in the holder 30 in a state where one guide groove 53 is penetrated by another so as to cross each other on the same plane.

Description

  The present invention relates to an undercut processing mechanism that enables an undercut portion that is uneven in a direction intersecting with a die-cutting direction of a molded product to be die-cut in a mold including a fixed die and a movable die.

  Conventionally, as this type of mold apparatus, for example, a loose core ejector apparatus described in Patent Document 1 is known. That is, it is locked to a mold core that forms the inner surface of the molded product, a movable loose core support rod that penetrates the core and is inclined with respect to the core surface, a movable mold plate, and a pedestal plate. And a slide base disposed in the slide path of the ejector plate so as to be slidable relative to the guide means rod, and the loose core support rod is interlocked with the movement of the slide base. .

  In such a loose core ejector device, one end of the guide means rod is locked to a holder that is tightly fitted in a recess formed in the lower surface of the movable side template, and the loose core support rod is attached to the core. An insertion hole formed at substantially the same inclination angle as the guide means rod is slidably inserted, and this insertion hole has the only structure for setting the inclination angle of the loose core support rod.

JP 2002-326233 A

  However, in the conventional technology as described above, not only the loose core support rod but also the guide means rod are inclined, and the mechanism for moving each rod at the same inclination angle is an ejector plate and a movable side type. It is comprised so that it may disperse | distribute to a board. Therefore, a large installation space is required compared to the amount of movement of the piece with the undercut part shape necessary for die-cutting of the undercut part of the molded product, and the overall structure is complicated, requiring time and labor for assembly. There was a problem that it was difficult to reduce costs.

  Further, it can only cope with the case where the undercut portion is in one direction on the outside or inside of the molded product, for example, the undercut portion protruding inside the lower surface of the molded product intersects the die cutting direction. In the case where the shape is uneven on both the left and right sides, it has been impossible to punch out such a molded product. Therefore, in addition to the shape of the undercut portion in the moldable molded product, there is a problem that the position and number are limited to a very narrow range.

  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. This makes it easy to reduce the cost, especially when the undercut that protrudes to the inside of the lower surface of the molded product is uneven on both the left and right sides intersecting the mold release direction. An object of the present invention is to provide an undercut processing mechanism that can be removed.

The gist of the present invention for achieving the object described above resides in the inventions of the following items.
[1] In a mold (11) composed of a fixed mold (12) and a movable mold (13), an undercut portion (P1) that is uneven in a direction intersecting the mold cutting direction of the molded product (P) can be punched. An undercut processing mechanism,
An ejector pin (20) that is driven in the die-cutting direction to project;
A holder (30) provided in the fixed mold (12) or the movable mold (13) in a state where the tip side of the ejector pin (20) is guided;
A holding piece (40) which is integrally provided on the tip end side of the ejector pin (20) and is slidable in the mold release direction within the holder (30);
An undercut molding core (60) divided into a state surrounding the undercut portion (P1) from both sides and disposed outside the holder (30);
Each of the divided undercut molding cores (60) is inserted into the holder (30) in a state where the cores are supported on the distal end side, and the base end side intersects the die-cutting direction with respect to the holding piece (40). A plurality of connecting members (50) slidably connected in separate escape directions from the undercut portion (P1)
Any one of the plurality of connecting members (50) and the other connecting member (52) are arranged so as to cross each other on the same plane, and the other connecting member (51) is connected to the other connecting member (51). A guide groove (53) through which the connecting member (52) is inserted and guided,
The one connecting member (51) has a first end from the undercut portion (P1) in which the undercut portion (P1) on the tip side crosses the die cutting direction and faces toward one end of the holding piece (40). 1 The base end side is connected to the holding piece (40) so as to be movable in the escape direction,
From the undercut portion (P1), the undercut portion (P1) on the distal end side crosses the die cutting direction and faces the other end side of the holding piece (40). The base end side is connected to the holding piece (40) so as to be movable in the second escape direction,
In the holder (30), there is provided first guide means (34) for guiding the one connecting member (51) along a first inclined direction that simultaneously moves in the die-cutting direction and the first relief direction, respectively. In addition, there is provided second guide means (35) for guiding the other connecting member (52) along a second inclined direction that simultaneously moves in the die-cutting direction and the second relief direction, respectively. Undercut processing mechanism.

[2] The one connecting member (51) is divided into two forks from the middle to the base end side, and the holding piece (40) is straddled from the front and rear by the guide groove (53) between the two forks. The fitting protrusions (54) are arranged so as to be opposed to the pair of base ends of the fork, respectively, and the fitting protrusions (54) are slid on the front and rear wall surfaces of the holding piece (40). A fitting groove (41) guided so as to be movable is provided so as to extend in the first clearance direction,
The other connecting member (52) slides in the second escape direction with respect to the upper end side of the holding piece (40) while being inserted through the guide groove (53) of the one connecting member (51). The undercut processing mechanism according to [1], wherein the base end sides are connected to each other as possible.

[3] having a core (70) for forming an inner hole (P2) on the lower end side of the undercut portion (P1);
The core (70) is fixed to the upper end side of the holder (30) at a position surrounded by the respective undercut molding cores (60) with an axis extending in a direction parallel to the die cutting direction. The undercut processing mechanism according to [1] or [2], wherein:

[4] A first oblique groove extending in the first inclined direction in which the one connecting member (51) moves, on either one of the outer wall of the one connecting member (51) and the inner wall of the holder (30). 34), and on the other side, a first oblique line (56) that extends in the first inclined direction and is slidably fitted into the first oblique groove (34) is provided, and the holder (30) The first oblique groove (34) or the first oblique line (56) inside is defined as the first guide means (34),
A second oblique groove (35) extending in the second inclined direction in which the other connecting member (52) moves is formed on one of the outer wall of the other connecting member (52) and the inner wall of the holder (30). A second oblique line (57) that extends in the second inclined direction and is slidably fitted into the second oblique groove (35) is provided in either one of the holders (30). The undercut processing mechanism according to [1], [2] or [3], wherein the second oblique groove (35) or the second oblique line (57) is the second guide means (35).

  [5] [1], [2], [3], wherein each of the undercut molded cores (60) is integrally provided on the tip side of each of the corresponding connecting members (50). Or the undercut processing mechanism as described in [4].

  [6] Each of the undercut molding cores (60) is detachably assembled as a separate body on the front end side of the corresponding connecting member (50). [1], [2], [ The undercut processing mechanism according to [3] or [4].

  [7] [1], [2], [3], [4], characterized in that each of the connecting members (50) is set to a length corresponding to the punching stroke of the molded product (P). , [5] or [6].

  [8] The holder (30) is configured as a part surrounding a hollow portion provided in the movable mold (13) or the fixed mold (12) provided with the holder (30) [1] , [2], [3], [4], [5], [6] or [7].

The present invention operates as follows.
The undercut processing mechanism described in [1] operates in accordance with the ejecting operation of the ejector pin (20) driven in the mold drawing direction during the mold drawing operation. When molding is finished and the fixed mold (12) is separated from the movable mold (13), one side of the molded product (P) appears. Next, the ejector pin (20) is pushed out so as to separate the molded product (P) from the movable die (13) for die cutting, and the tip side of the ejector pin (20) is fixed to the fixed die (12) or It is slidably guided in a holder (30) provided in the movable mold (13).

  At this time, in the holder (30), the holding piece (40) integrally provided on the tip end side of the ejector pin (20) slides in the mold releasing direction in the holder (30). Then, the plurality of connecting members (50) slidably connected to the holding pieces (40) in separate escape directions from the undercut portion (P1) intersecting the die-cutting direction are respectively in the die-cutting direction and The escape direction moves to the synthesized direction.

  That is, among the connecting members (50), one connecting member (51) is moved by the first guide means (34) in the holder (30) at the same time in the mold release direction and the first escape direction. Guided in the direction. Further, the other connecting member (52) is guided by the second guide means (35) in the holder (30) in the second inclined direction that moves simultaneously in the mold release direction and the second escape direction. The one connecting member (51) and the other connecting member (52) are arranged so as to cross each other on the same plane, and the other connecting member (52) is a guide in the one connecting member (51). It moves with the groove (53) inserted.

  Thereby, each undercut molding core (60) supported by the front end side of each connection member (50) also moves simultaneously in a die-cutting direction and a relief direction. Therefore, even if the undercut portion (P1) protruding inside the lower surface of the molded product (P) is uneven on both the left and right sides intersecting the die cutting direction, the undercut portion of the molded product (P) (P1) can be removed, and the entire molded product (P) can be easily punched.

  When the molded product (P) is removed, as the ejector pin (20) returns to the molding position, it is pulled by the ejector pin (20) and each connecting member (50) or each undercut molded core (60). ) Also returns to the initial position. Further, the fixed mold (12) is also returned to the original molding position, and the next molded product (P) is molded.

  According to the undercut processing mechanism as described above, the overall structure can be simplified, and the manufacturing cost can be greatly reduced. Further, each slide member is concentrated on only one of the fixed mold (12) and the movable mold (13) via the holder (30) without being distributed to the ejector base plate and the movable mold (13). It can be arranged. As a result, a compact configuration can be achieved, a space-saving request can be met, and processing and incorporation into a mold are facilitated.

  In particular, one connecting member (51) and another connecting member (52) are arranged so as to cross each other on the same plane, and the other connecting member (52) is located on one connecting member (51). By moving in a state where the guide groove (53) is inserted, the connecting members (50) or the undercut molding cores (60) spreading in the direction intersecting with the die-cutting direction are not spread out to the side. A compact arrangement is possible. Furthermore, when one connecting member (51) and the other connecting member (52) intersect, they are in a state of supporting each other and the strength can be maintained.

  According to the undercut processing mechanism described in [2], the one connecting member (51) is divided into two forks from the middle to the base end side, and is held by the guide groove (53) between the two forks. Since the piece (40) is disposed so as to straddle from the front and rear, the width of the guide groove (53) can be kept constant.

  In addition, fitting protrusions (54) projecting so as to face each other are provided at a pair of forked base ends, and each fitting protrusion (54) is slidably guided on the front and rear wall surfaces of the holding piece (40). Since the fitted groove (41) is provided so as to extend in the first clearance direction, the proximal end side of the one connecting member (51) and the holding piece (40) are firmly connected so as to be capable of being pushed and pulled. The one connecting member (51) can be reliably guided in the first escape direction with respect to the holding piece (40).

  Furthermore, the other connecting member (52) is slidable in the second escape direction with respect to the upper end side of the holding piece (40) while being inserted through the guide groove (53) of the one connecting member (51). Since the base end side is connected, another connecting member (52) is inserted in the guide groove (53) in one connecting member (51) in the second escape direction with respect to the holding piece (40). It can be surely guided.

  According to the undercut processing mechanism described in [3], the undercut processing mechanism has the core (70) for forming the inner hole (P2) on the lower end side of the undercut portion (P1). ) Extends in a direction parallel to the die cutting direction, and is fixed to the upper end side of the holder (30) at a position surrounded by each undercut molding core (60). Thereby, in addition to the inner hole (P2) in the molded product (P), even when there is an undercut part (P1) on the outer peripheral side surrounding the inner hole (P2), it is possible to easily perform die cutting. Become.

  According to the undercut processing mechanism described in [4], the first inclination in which the one connecting member (51) moves to either the outer wall of the one connecting member (51) or the inner wall of the holder (30). A first oblique groove (34) extending in the direction is provided, and a first oblique line (56) that extends in the first inclined direction and is slidably fitted in the first oblique groove (34) is provided on either one of them. The first inclined groove (34) or the first oblique line (56) in the holder (30) is used as the first guide means (34).

  On the other hand, a second inclined groove (35) extending in the second inclined direction in which the other connecting member (52) moves is provided on either the outer wall of the other connecting member (52) or the inner wall of the holder (30), A second oblique line (57), which extends in the second inclined direction and is slidably fitted in the second oblique groove (35), is provided on either one of them, and the second oblique line in the holder (30) is provided. The groove (35) or the second oblique line (57) serves as the second guide means (35).

  As a result, the movement of the one connecting member (51) and the other connecting member (52) is reliably and smoothly guided by the fitting relationship between the grooves and the strips provided in these and the holder (30). Further, since the load at the time of die-cutting is dispersed without being concentrated in one place, durability is improved. In addition, since high accuracy at the time of design is eased, further cost reduction is possible.

  According to the undercut processing mechanism described in [5] above, each undercut molding core (60) is integrally provided at the tip side of each corresponding connecting member (50), thereby further simplifying the structure. This makes it possible to reduce costs.

  According to the undercut processing mechanism described in [6] above, various undercut molding cores (60) can be attached and detached separately on the distal ends of the corresponding connecting members (50). It becomes possible to replace the undercut molded core (60) later, thereby expanding versatility.

  According to the undercut processing mechanism described in [7] above, the mold of the molded product (P) is set by setting each connecting member (50) to a length corresponding to the die-cutting stroke of the molded product (P). A large stroke to a small stroke in punching can be appropriately handled.

  According to the undercut processing mechanism described in [8] above, the holder (30) itself is configured as a movable mold (13) or a fixed mold (12) provided with the holder (30). That is, if a hollow portion that directly replaces the inner space of the holder (30) is formed directly in the mold (11), and the holding piece (40) and each connecting member (50) are movably accommodated in the hollow portion, respectively. good. As a result, the holder (30) parts are not required, the number of parts is reduced, the configuration of the entire apparatus can be simplified, and the cost can be further reduced.

  According to the undercut processing mechanism according to the present invention, among the molded products having an undercut portion protruding in a direction intersecting with the die cutting direction of the molded product, the undercut portion protruding particularly on the lower surface inside of the molded product is die-cut. Even in the case of a molded product that is uneven on the left and right sides that intersect the direction, it can be easily punched.

  In addition, it can be configured compactly, can meet the demands for space saving, can be easily processed and assembled into the mold, is simple in configuration, does not require time and effort for assembly, and costs Down can be realized.

It is a longitudinal cross-sectional view which shows the state at the time of shaping | molding in the metal mold | die and undercut process mechanism of the metal mold apparatus which concerns on embodiment of this invention. It is a longitudinal cross-sectional view which shows the state at the time of the die cutting of the metal mold | die and undercut process mechanism of the metal mold apparatus which concerns on embodiment of this invention. It is a longitudinal cross-sectional view which shows the state at the time of shaping | molding in the metal mold | die and undercut process mechanism of the metal mold apparatus which concerns on embodiment of this invention from another direction. It is a perspective view which shows the external appearance of the whole at the time of shaping | molding of the undercut process mechanism which concerns on embodiment of this invention. It is a perspective view which shows the mode in the holder at the time of shaping | molding of the undercut process mechanism which concerns on embodiment of this invention. It is a perspective view which shows the external appearance of the whole at the time of die cutting of the undercut processing mechanism which concerns on embodiment of this invention. It is a perspective view which shows the mode in the holder at the time of die cutting of the undercut process mechanism which concerns on embodiment of this invention. It is a perspective view which shows the relative positional relationship of the holding | maintenance piece and a connection member at the time of die cutting of the undercut processing mechanism which concerns on embodiment of this invention. It is a perspective view which shows the one side crack of the holder of the undercut process mechanism which concerns on embodiment of this invention. It is a perspective view which decomposes | disassembles and shows each component except the holder of the undercut process mechanism which concerns on embodiment of this invention. It is a perspective view which shows the relative positional relationship of the holding | maintenance piece and a connection member at the time of shaping | molding of the undercut process mechanism which concerns on embodiment of this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment that represents the present invention will be described based on the drawings.
1 to 3 are longitudinal sectional views for explaining the operation of the mold 11 and the undercut processing mechanism constituting the molding die apparatus 10 according to the present embodiment. FIG. 1 shows a state during molding of the molded product P, and FIG. 2 shows a state during die cutting of the molded product P. FIG. 3 is a longitudinal sectional view seen from another direction perpendicular to FIG. The molding die apparatus 10 is an apparatus that molds the molded product P with the mold 11.

  As shown in FIGS. 1 to 3, the molded product P according to the present embodiment has a thin and curved shape as a whole, and includes an undercut portion P1 having a cross-sectional shape illustrated on the inner surface side thereof. Yes. Further, an inner hole P2 is provided on the lower end side of the undercut portion P1. Here, the material of the molded product P is not limited to a synthetic resin such as plastic, but may be a metal such as iron, copper, or aluminum.

  As shown in FIGS. 1 and 2, the mold 11 of the molding die apparatus 10 molds the fixed mold 12 that molds the outer surface side of the molded product P and the inner surface side including the undercut portion P1 of the molded product P. And a movable mold 13. A movable mounting plate 14 is installed below the movable mold 13, and an ejector base plate 15 made of a double-layered plate material can be driven in the vertical direction between the movable mold 13 and the movable mounting plate 14. It is arranged.

  The undercut processing mechanism that forms the basis of the present invention enables the undercut portion P1 to be punched when the molded product P is punched. The ejector pin 20 that is driven in the punching direction and protrudes, and the ejector A holder 30 in which the tip 21 of the pin 20 is slidably guided, a holding piece 40 which is provided integrally with the tip 21 of the ejector pin 20 and slides in the mold release direction within the holder 30, and the outside of the holder 30 And an undercut molding core 60 disposed in the holder 30 and a connecting member 50 inserted into the holder 30 to connect the holding piece 40 and the undercut molding core 60.

  As shown in FIGS. 1 and 2, the ejector pin 20 is formed of a round bar member, and is erected in a vertical state on the ejector base plate 15. A base end portion 22 of the ejector pin 20 is fixed to the ejector base plate 15 via a knock pin 23. As the ejector base plate 15 moves upward, the ejector pin 20 is driven in the die-cutting direction to project. The tip 21 of the ejector pin 20 is inserted into the holder 30.

  The holder 30 is integrally provided in the movable mold 13. Here, the movable die 13 is formed with a hollow portion 13a for installing the holder 30, and the holder 30 is embedded in the hollow portion 13a and closed by a separate block 13b. A vertical hole 13c through which the ejector pin 20 passes is formed in the block 13b. As shown in FIGS. 4 and 5, the holder 30 is formed by combining two symmetrical parts, and is formed in a box shape having an internal space 31 (see FIG. 9) having an open lower end surface.

  As shown in FIG. 6, guide holes 32 and 33 are formed in the upper end surface of the holder 30 so that a connecting member 50 described later is slidably guided therethrough. A pin-shaped core 70 that protrudes upward along the central axis of the holder 30 is fixed to the upper end surface of the holder 30. The core 70 is for forming the inner hole P2 on the lower end side of the undercut portion P1.

  A tip 21 of the ejector pin 20 is movably inserted in a lower part of the internal space 31 of the holder 30, and a holding piece 40 is integrally provided at the tip 21. The holding piece 40 is driven in the mold release direction as the ejector pin 20 moves up and down, and is slidable between the molding position shown in FIG. 1 and the release position shown in FIG. 2 in the internal space 31 of the holder 30. It is stored. A connecting member 50 is slidably accommodated in the internal space 31 of the holder 30. Guide means for movably guiding the connecting member 50 is provided on the inner wall of the inner space 31 of the holder 30, which will be described later.

  As shown in FIGS. 5 to 8, the holding piece 40 is made of a rectangular parallelepiped member shown in the figure, and the distal end portion 21 of the ejector pin 20 is fixed to the lower end side thereof by screws. On the front and rear wall surfaces of the holding piece 40, one end of the holding piece 40 (FIG. 8) intersects with a direction of escaping obliquely downward toward one side (left side in FIG. 2) of the undercut portion P <b> 1. A fitted groove 41 is provided along a “first clearance direction” that extends obliquely downward toward the left end).

  Further, the upper end surface extending on both sides of the holding piece 40 has a direction of escaping toward the other side (right side in FIG. 2) of the undercut portion P1, that is, intersecting the die-cutting direction. A protrusion 42 extending in the “second relief direction” toward the other end (right end in FIG. 8) is provided. A connecting member 50 described below is movably connected to the fitting groove 41 and the protrusion 42 of the holding piece 40.

  As shown in FIGS. 5 to 8, the connecting member 50 connects the holding piece 40 and an undercut molding core 60 described later, and includes two connecting members 51 and 52. Each of the connecting members 51 and 52 is housed in the inner space 31 of the holder 30, and is connected and supported so as to be slidable in different escape directions intersecting the holding piece 40 at different angles with respect to the mold release direction. Yes.

  As shown in FIG. 5, the connecting members 51 and 52 are arranged so as to cross each other on the same plane, and one connecting member 51 is guided by another connecting member 52 being inserted therethrough. A groove 53 is formed. The one connecting member 51 is formed so as to be divided into two forks from the middle to the base end side, and is arranged in such a manner as to straddle the holding piece 40 from the front and rear by the guide groove 53 between the two forks.

  A pair of proximal ends of the one connecting member 51 divided into two forks are provided with fitting protrusions 54 that protrude so as to face each other. Each fitting protrusion 54 is slidably fitted into a pair of fitting grooves 41 on the front and rear wall surfaces of the holding piece 40. Thereby, the base end side of one connection member 51 is connected to the holding piece 40 so as to be movable in the first clearance direction.

  On the proximal end side of the other connecting member 52, a dovetail groove 55 is provided that is slidably fitted to the protrusion 42 on the upper end surface of the holding piece 40. Thereby, the base end side of the other connecting member 52 is connected and supported so as to be movable in the second escape direction with respect to the holding piece 40. Further, the other connecting member 52 moves from the middle to the base end side in a state of being inserted into the guide groove 53 of the one connecting member 51.

  As shown in FIG. 7 and FIG. 9, on the inner wall of the inner space 31 of the holder 30, the one connecting member 51 is removed from the molding position shown in FIG. The first guide means for guiding along the “first inclined direction” that moves simultaneously in the die-cutting direction and the first relief direction is provided. The first guide means is provided as a first oblique groove 34 having a groove-shaped cross section. The first oblique grooves 34 are provided so that a pair faces the both front and rear wall surfaces of the holder 30.

  Here, the both side edges of the connecting member 51 are slidably fitted to the pair of front and rear first oblique grooves 34 as the first oblique stripes 56 as they are. The first oblique line 56 may be provided on either the outer wall of the one connecting member 51 or the inner wall of the holder 30, and the first oblique groove 34 is provided on either one of them. In short, any structure may be used as long as one connecting member 51 is guided so as to be movable in the first inclined direction as it is during the die-cutting operation.

  Further, on the inner wall of the inner space 31 of the holder 30, the other connecting member 52 is moved from the molding position shown in FIG. 1 toward the mold release position shown in FIG. And a second guide means for guiding along a “second inclination direction” that simultaneously moves in the second escape direction. The second guide means is provided as a second oblique groove 35 having a concave groove cross section that intersects the first oblique groove 34. Similarly to the first oblique groove 34, the second oblique groove 35 is also provided so that a pair faces the front and rear wall surfaces of the holder 30.

  Here, the pair of front and rear second oblique grooves 35 are slidably fitted as second oblique stripes 57 with both side edges of the other connecting member 52 as they are. Similarly to the first oblique line 56, the second oblique line 57 may be provided on either the outer wall of the other connecting member 52 or the inner wall of the holder 30, and the second inclined groove 35 is provided on either one of the other. It will be. In short, any structure may be employed as long as the other connecting member 52 is guided so as to be movable in the second inclined direction as it is during the die cutting operation.

  As shown in FIG. 6, the connecting members 51 and 52 extend outside through the guide holes 32 and 33 on the upper end surface of the holder 30, respectively. The first molded core 61 and the second molded core 62 constituting the undercut molded core 60 are assembled in a detachable manner as separate bodies. In this way, the undercut molded core 60 is divided into two, that is, a first molded core 61 and a second molded core 62 that surround the undercut portion P1 of the molded product P from both sides.

  The first molded core 61 is formed on one side (left side in FIG. 1) of the undercut portion P1 of the molded product P or a part of the inner surface of the molded product P, and the second molded core 62 is formed of the molded product P. The other side (the right side in FIG. 1) of the undercut part P1 is shape | molded. As shown in FIG. 2, the movable mold 13 is formed with a recess 13 d in which the first molded core 61 and the second molded core 62 are accommodated so as to be able to appear and retract. The concave portion 13d reaches the upper end surface of the holder 30 and communicates with the hollow portion 13a.

  The 1st shaping | molding core 61 is guided to the said 1st inclination direction which can be shape | molded from the undercut part P1 with the movement of the supported 1st connection member 51. FIG. Moreover, the 2nd shaping | molding core 62 is guided to the said 2nd inclination direction which can be shape | molded from the undercut part P1 with the movement of the other connection member 52 supported. In addition, although each shaping | molding core 61 and 62 is each assembled | attached to the front-end | tip part of each connection member 51 and 52 so that attachment or detachment is possible separately, you may provide integrally in the front-end | tip part of each connection member 51 and 52. .

Next, the operation of the present embodiment will be described.
As shown in FIGS. 1 and 3, a molded product P is molded by the molding die apparatus 10. At this time, in the holder 30 in the movable mold 13, the other connecting member 52 passes through the guide groove 53 of the one connecting member 51 so that the connecting members 51 and 52 intersect each other in the vicinity of the center. In this state, the molding cores 61 and 62 supported by the tip portions of the connecting members 51 and 52 are in molding positions where they contact each other so as to surround the core 70 from the entire circumferential direction.

  When the molding of the molded product P is completed, the ejector base plate 15 is driven upward as shown in FIG. 2 after the fixed mold 12 is separated from the movable mold 13. Then, the ejector pin 20 erected on the ejector base plate 15 protrudes straightly upward in the mold release direction while passing through the vertical hole 13c on the movable mold 13 side. In the holder 30, the holding piece 40 supported by the tip portion 21 of the ejector pin 20 moves together with the ejector pin 20 in the mold release direction.

  Then, as the holding piece 40 moves in the die-cutting direction, the one connecting member 51 whose base end side is connected and supported by the fitting groove 41 of the holding piece 40 is shown in FIG. To the mold release position shown in FIG. 2, it moves to the 1st inclination direction which moves simultaneously in a die-cutting direction and a 1st escape direction. Here, the first connecting member 51 is guided along the first inclined direction while the first inclined line 56 slides in the first inclined groove 34 as the first guide means in the holder 30.

  Further, another connecting member 52 whose base end side is connected and supported by the protrusion 42 of the holding piece 40 is inserted into the guide groove 53 of the one connecting member 51 from the molding position shown in FIG. It moves to the 2nd inclination direction which moves to a mold release direction and a 2nd escape direction toward the mold release position shown simultaneously. Here, the other connecting member 52 is guided along the second inclined direction while the second inclined line 57 slides in the second inclined groove 35 which is the second guide means in the holder 30.

  As described above, the movement of the connecting members 51 and 52 in the holder 30 is caused by the fitting relationship between the oblique lines 56 and 57 of the connecting members 51 and 52 and the inclined grooves 34 and 35 as guide means in the holder 30. Therefore, it is possible to reliably and smoothly guide each of the inclined directions. In addition, since the load at the time of punching out the molded product P is also distributed without being concentrated in one place, the durability is improved. In addition, since high accuracy at the time of design is eased, further cost reduction is possible.

  Then, each connecting member 51, 52 moves in each of the different inclination directions, so that the undercut molding core 60 supported on the distal end side of each connecting member 51, 52 is released from the molding position. Move to. That is, as shown in FIG. 2, the first molding core 61 supported by one connecting member 51 is detached to one side of the undercut portion P <b> 1, and the second molding is supported by the other connecting member 52. The core 62 separates to the other side of the undercut portion P1. As a result, the undercut portion P1 of the molded product P can be removed, and the molded product P can be punched.

  According to such a configuration, even if the undercut portion P1 protruding inside the lower surface of the molded product P has a complicated shape such that the left and right sides intersecting the die-cutting direction are uneven at different angles, molding is performed. The undercut portion P1 of the product P can be removed, and the inner core P2 of the undercut portion P1 can be accommodated by the core 70, and the entire molded product P can be easily punched.

  Furthermore, according to the undercut processing mechanism according to the present embodiment, the connecting member 50 that supports the undercut forming core 60 is movable through the holder 30 without being dispersed in the ejector base plate 15 and the movable mold 13. 13 can be concentrated and arranged. As a result, the entire molding die apparatus 10 can be configured in a compact manner, and a space-saving request can be met, and processing and incorporation into the die 11 are facilitated.

  In particular, as shown in FIG. 4, the undercut processing mechanism can be configured as a unit that is preliminarily incorporated in the holder 30 and can be easily placed in the movable mold 13 via the holder 30 as shown in FIG. Can be retrofitted. Such a configuration is suitable for a case where machining such as making a space for housing the holder 30 in the movable mold 13 itself is easy, as in the case where the movable mold 13 is small.

  In FIG. 2, when the molded product P is removed, as the ejector pin 20 returns to the position at the time of molding, the connecting members 51 and 52 together with the holding piece 40 are also returned to the initial position. Further, the fixed mold 12 also returns to the molding position, and the next molded product P is molded. By the way, each connection member 51 and 52 is designed to the length according to the stroke which can be die-cut of the whole molded product P including the undercut part P1. Thereby, it can respond | correspond suitably from the big stroke in the die cutting of the molded article P to a small stroke.

  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 product P and the first molded core 61 and the second molded core 62 are not limited to those specifically illustrated. In addition, although each of the connecting members 51 and 52 and the molding cores 61 and 62 is provided two by two, for example, three or four or more may be provided by an appropriate number according to the undercut portion P1. it can.

  Moreover, in the said embodiment, each molded core 61 and 62 can be attached to the various molded cores 61 and 62 later by attaching | detaching separately to the front-end | tip part of each connection member 51 and 52 so that attachment or detachment is possible. It becomes possible and versatility spreads. On the other hand, you may comprise so that each shaping | molding core 61,62 may be integrally provided in the front-end | tip part of each connection member 51,52. Thereby, the structure is further simplified, and the cost can be reduced.

  Further, in the above-described embodiment, the connecting members 51 and 52 are guided in the tilting direction by providing the inclined grooves 34 and 35 that fit into the ridges 56 and 57 of the connecting members 51 and 52 in the holder 30. In addition, for example, a guide hole is formed in the end surface portion of the holder 30 so that the connecting members 51 and 52 are movably guided in a state where the connecting members 51 and 52 are inclined and used as the guide means. Or it is good also as a guide means by providing the groove | channel which guides the whole outer periphery of each connection member 51 and 52 inside the holder 30 so that sliding is possible.

  In the above embodiment, the holder 30 is integrally provided in the movable mold 13. However, the holder 30 may be integrated in the fixed mold 12 instead of the movable mold 13. Furthermore, the holder 30 itself may be configured as a part surrounding the hollow portion of the movable mold 13 (or the fixed mold 12).

  That is, it is only necessary to form a hollow portion directly in place of the internal space of the holder 30 in the mold 11 and accommodate the undercut molding core 60 and the like in the hollow portion. Thereby, the number of parts regarding the holder 30 is reduced, the configuration of the entire molding die apparatus 10 can be further simplified, and the cost can be reduced.

  Since it can be configured compactly and can meet the demand for space saving, it is excellent in processing and assembling into small molds. The present invention can be applied when the shape is uneven on both the left and right sides intersecting the direction.

P ... Molded product P1 ... Undercut part P2 ... Inner hole 10 ... Molding die device 11 ... Mold 12 ... Fixed mold 13 ... Movable mold 13a ... Hollow part 13b ... Block 13c ... Vertical hole 13d ... Recess 14 Plate 15 ... Ejector base plate 20 ... Ejector pin 21 ... Tip portion 22 ... Base end portion 23 ... Knock pin 30 ... Holder 31 ... Internal space
32 ... Guide hole 33 ... Guide hole 34 ... First oblique groove 35 ... Second oblique groove 40 ... Holding piece 41 ... Fitted groove 42 ... Rid 50 ... Connecting member 51 ... Connecting member 52 ... Connecting member 53 ... Guide groove 54 ... fitting projection 55 ... dovetail groove 56 ... first oblique stripe 57 ... second oblique stripe 60 ... undercut molded core 61 ... first molded core 62 ... second molded core 70 ... core

Claims (8)

In a mold composed of a fixed mold and a movable mold, it is an undercut processing mechanism that makes it possible to mold an undercut portion that is uneven in the direction intersecting the mold cutting direction of the molded product,
An ejector pin that is driven in the die-cutting direction and operates to protrude;
In a state where the front end side of the ejector pin is guided, a holder provided in the fixed mold or the movable mold;
A holding piece that is integrally provided on the tip end side of the ejector pin, and is slidable in the mold release direction within the holder;
An undercut molding core that is divided into a state surrounding the undercut part from both sides and is arranged outside the holder;
The separated undercut molding cores are inserted into the holder in a state where the cores are supported on the distal end side, respectively, and separate escapes from the undercut portions where the proximal end sides intersect the die cutting direction with respect to the holding piece. A plurality of connecting members connected to be slidable in the direction,
Any one of the plurality of connecting members and the other connecting member are arranged so as to cross each other on the same plane, and the guide groove into which the other connecting member is inserted and guided through the one connecting member. Form the
Proximal end of the one connecting member to the holding piece movably in a first escape direction from the undercut portion where the undercut portion on the distal end intersects the die-cutting direction and toward the one end side of the holding piece Connecting the sides,
Based on the holding piece, the other connecting member is movable in a second escape direction from the undercut portion where the undercut portion on the tip side intersects the die-cutting direction and faces the other end side of the holding piece. Connect the end side,
In the holder, there is provided first guide means for guiding the one connecting member along a first inclined direction that simultaneously moves in the die-cutting direction and the first relief direction, and the other connecting member is provided in the holder. An undercut processing mechanism, characterized in that second guide means is provided for guiding along a second inclined direction that simultaneously moves in a die-cutting direction and the second relief direction. The one connecting member is formed to be divided into two forks from the middle to the base end side, and the holding piece is disposed across the front and rear by the guide groove between the two forks, and the pair of base ends of the two forks While providing fitting protrusions that protrude so as to face each other, provided are fitted grooves in which the respective fitting protrusions are slidably guided on the front and rear wall surfaces of the holding piece so as to extend in the first escape direction,
The other connecting member is connected to a base end side so as to be slidable in the second escape direction with respect to an upper end side of the holding piece while being inserted through a guide groove of the one connecting member. The undercut processing mechanism according to claim 1. Having a core for forming an inner hole on the lower end side of the undercut portion;
3. The core according to claim 1, wherein an axis of the core extends in a direction parallel to the die cutting direction and is fixed to an upper end side of the holder at a position surrounded by each of the undercut molding cores. The undercut processing mechanism described in 1. One of the outer wall of the one connecting member and the inner wall of the holder is provided with a first oblique groove extending in the first inclined direction in which the one connecting member moves, and the other is also provided with the first inclined member. A first oblique line extending in a direction and slidably fitted in the first oblique groove, the first oblique groove or the first oblique line in the holder being the first guide means,
Either one of the outer wall of the other connecting member and the inner wall of the holder is provided with a second oblique groove extending in the second inclined direction in which the other connecting member moves, and the second inclined groove is also provided on either of the other connecting members. A second oblique line extending in a direction and slidably fitted in the second oblique groove, and the second oblique groove or the second oblique line in the holder is used as the second guide means. The undercut processing mechanism according to claim 1, 2, or 3.   5. The undercut processing mechanism according to claim 1, wherein each of the undercut forming cores is integrally provided on a distal end side of each of the corresponding connecting members.   5. The undercut processing mechanism according to claim 1, wherein each of the undercut forming cores is detachably assembled as a separate body on a front end side of each of the corresponding connecting members.   The undercut processing mechanism according to claim 1, 2, 3, 4, 5, or 6, wherein each of the connecting members is set to a length corresponding to a punching stroke of the molded product.   The said holder was comprised as a part surrounding the hollow part provided in the said movable type | mold which provides this holder, or the said fixed type | mold, The 1, 2, 3, 4, 5, 6 or 7 characterized by the above-mentioned. Undercut processing mechanism.

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