JP2010083033A - Undercut processing mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an undercut processing mechanism which satisfies a requirement for space saving by constructing it compact, can be assembled without labor and time since the structure is simple, and achieves cost reduction, and particularly enables a molded article, having an undercut portion along the whole circumferential directions on the outer circumferential side surrounding an inner hole of the molded article, to be easily removed from a mold. <P>SOLUTION: Slide members 30 respectively supporting a pair of undercut-forming cores 35 and 35 surrounding a core 50 from the whole circumference are housed in a holder 40 mounted in a movable mold 13. Each slide member 30 is slidable between the molding position where the undercut-forming cores 35 contact each other surrounding the core 50 and the mold removal position where the undercut-forming cores 35 separate from each other. In a holder 40, an oblique groove 45 is mounted to guide the respective slide members 30 from the molding position toward the mold removal position along an oblique direction enabling simultaneous movement of each slide member in the mold removal direction and an escape direction when the molded product P is removed from the mold. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an undercut process for forming an undercut portion in a molded product in a moldable state at the time of die-molding of the molded product in a molding die apparatus for molding the molded product by a fixed mold and a movable mold. Regarding the mechanism.

  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 mold plate, and the loose core support rod is attached to the core. The insertion hole formed at substantially the same inclination angle as that of the guide means rod is slidably inserted, and this insertion hole is the only angle setting hole 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 provided on the ejector plate and the movable side. It is comprised so that it may disperse | distribute to a template. 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.

  In addition, 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 inner hole is formed in addition to the inner hole shape like a tubular protrusion on the inside of the molded product. In the case where there is an undercut portion extending in the entire circumferential direction on the surrounding outer peripheral side, it is impossible to die-cut 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. Is easy to configure, requires less labor and time for assembly, and can reduce costs. In particular, it is undercut across the entire circumference of the outer periphery surrounding the inner hole of the molded product. An object of the present invention is to provide an undercut processing mechanism capable of easily punching a molded product having a shape with a portion.

The gist of the present invention for achieving the object described above resides in the inventions of the following items.
[1] In a molding die device (10, 10A) for molding a molded product (P) with a fixed mold (12) and a movable mold (13), the molded product (P) is removed when the molded product (P) is released. The undercut processing mechanism for making the undercut portions (P11, P12) located in
A core (50, 60) having a shape corresponding to the inner hole (P10) in the molded product (P);
The molded product (P) has a shape corresponding to the undercut portions (P11, P12) on the outer peripheral side surrounding the inner hole (P10) of the molded product (P), and a plurality of the cores (50, 60) are surrounded from the outside. An undercut molding core (35) arranged to be divided into
A plurality of slide members (30) arranged to face each other with the cores (50, 60) in between, with each of the undercut molding cores (35) being supported one by one at the tip. When,
In the fixed mold (12) or the movable mold (13), each of the slide members (30) is arranged so that the undercut portions (P11, P12) at the respective distal ends thereof are the core (50, 60) a holder (40) that is slidable between a molding position that contacts each other so as to surround from the entire circumferential direction and a release position that is spaced apart from each other with the core (50, 60) interposed therebetween. And comprising
In the holder (40), when the molded product (P) is punched, each slide member (30) is directed from the molding position to the mold release position, and the axis of the core (50, 60) Guide means (45) is provided for guiding along a tilt direction that moves simultaneously in a parallel die-cutting direction and in a relief direction from the undercut portions (P11, P12) intersecting the die-cutting direction. Characteristic undercut mechanism.

[2] Corresponding to each of the slide members (30), it has a plurality of ejector pins (20) that are driven in a die-cutting direction to perform a protruding operation,
The holder (40) is installed in the movable mold (13) in a state in which the tip (23) of each ejector pin (20) is guided to be movable,
Each slide member (30) is connected so that the respective base end portions are slidable in the escape direction with respect to the tip end portion (23) of the ejector pin (20),
A plurality of oblique grooves (45) extending in the inclination direction in which the slide members (30) move are provided on either the inner wall of the holder (40) or the outer walls of the slide members (30), On the other hand, a plurality of oblique lines (32) that extend in the inclined direction and are slidably fitted in the respective oblique grooves (45) are provided, and each oblique groove (45) in the holder (40) is provided. ) Or each ridge (32) is the guide means (45). The undercut processing mechanism according to [1].

  [3] The undercut processing mechanism according to [1] or [2], wherein the undercut molding core (35) is integrally provided at a tip portion of each corresponding slide member (30). .

  [4] As described in [1] or [2], the undercut molded cores (35) are detachably provided as separate bodies at the tip portions of the corresponding slide members (30). Undercut processing mechanism.

  [5] At least one of the undercut molding cores (35) is different from the others for each slide member (30), and undercut portions (P11, P12) having different shapes can be molded. The undercut processing mechanism according to [1], [2], [3] or [4].

  [6] [1], [2], [3], [4] characterized in that each slide member (30) is set to a length corresponding to the die-cutting stroke of the molded product (P). ] Or the undercut processing mechanism according to [5].

  [7] The holder (40) is configured as a part surrounding a hollow portion in the movable mold (13) or the fixed mold (12) provided with the holder (40) [1], [ [2], [3], [4], [5] or [6].

The present invention operates as follows.
According to the undercut processing mechanism described in [1], the core (50, 60) having a shape corresponding to the inner hole (P10) in the molded product (P) and the inner hole ( And an undercut molding core (35) having a shape corresponding to the undercut portions (P11, P12) on the outer peripheral side surrounding P10), and the undercut molding core (35) has the core (50, 60) outside. It is divided and arranged in a state of surrounding from.

  Each of the undercut molding cores (35) divided into a plurality of parts is supported at the tip of the slide member (30), and each slide member (30) has a core (50, 60) between each other. Are arranged in a state of facing each other. Further, each slide member (30) is slidably accommodated in a holder (40) provided in one of the fixed mold (12) and the movable mold (13).

  Here, each slide member (30) has a molding position where each undercut molding core (35) supported by each slide member (30) is in contact with each other so as to surround the core (50, 60) from the entire circumferential direction, and the middle The holder (40) is slidable to a release position separated from each other with the child (50, 60) therebetween. Thereby, in addition to the inner hole (P10) in the molded product (P), even if there is an undercut portion (P11, P12) on the outer peripheral side surrounding the inner hole (P10), the die can be easily removed. It becomes possible.

  In addition, when the molded product (P) is released, each slide member (30) is moved from the molding position toward the mold release position by the guide means (45) provided in the holder (40). 60) along the inclination direction that moves simultaneously in the die-cutting direction parallel to the axial center and the escape direction from the undercut portions (P11, P12) intersecting with the die-cutting direction. Accordingly, each slide member (30) and each undercut molding core (35) supported by each slide member (30) can reliably move from the molding position to the mold release position.

  According to the undercut processing mechanism as described above, the overall structure can be simplified, and the manufacturing cost can be greatly reduced. Moreover, each slide member (30) is not distributed to the ejector base plate or the movable mold (13), but only to one of the fixed mold (12) and the movable mold (13) via the holder (40). It can be centrally 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.

  The undercut processing mechanism described in [2] operates in accordance with the ejecting operation of the ejector pin (20) driven in the die-cutting direction when the molded product (P) is die-cut. When molding is finished and the fixed mold (12) is separated from the movable mold (13), the outer surface side of the molded product (P) appears. Next, the ejector pin (20) is pushed out so as to release the molded product (P) from the movable die (13) in order to remove the die, and the tip (23) of the ejector pin (20) is moved to the holder (40). Move in.

  Inside the holder (40), the slide member (30) connected to the tip (23) of the ejector pin (20) moves along the ejecting operation of the ejector pin (20). By (45), it is guided in the inclination direction that moves simultaneously in the die-cutting direction and the relief direction, respectively. As a result, each undercut molding core (35) is also reliably moved from the molding position to the mold release position, so that the undercut portions (P11, P12) of the molded product (P) can be removed from the mold, and the molded product (P P) The whole can be easily removed from the mold.

  Here, a plurality of oblique grooves (45) extending in the inclined direction in which each slide member (30) moves are provided on either the inner wall of the holder (40) or the outer wall of each slide member (30), On one of the other sides, a plurality of oblique lines (32), which extend in the inclined direction and are slidably fitted in the respective oblique grooves (45), are provided, and each oblique groove ( 45) or each ridge (32) is referred to as the guide means (45).

  Thereby, the movement of each slide member (30) is surely and smoothly performed by the fitting relationship between the slant groove (45) and the ridge (32) provided in each slide member (30) itself and the holder (40). In addition to being guided, the load at the time of die cutting is also distributed without being concentrated in one place, so that the 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 [3], the undercut molding core (35) is integrally provided at the tip of each corresponding slide member (30). Thereby, the structure is further simplified, and the cost can be reduced.

  According to the undercut processing mechanism described in [4] above, the undercut forming cores (35) are detachably provided as separate bodies at the tip portions of the corresponding slide members (30). Thereby, it becomes possible to replace | exchange later with various undercut shaping | molding cores (35), and versatility spreads.

  According to the undercut processing mechanism described in [5], at least one of the undercut molding cores (35) is different from the other for each slide member (30), and the undercut portions (P11) having different shapes from each other. , P12) can be formed. Thereby, for example, a plurality of undercut portions (P11, P12) that are radially positioned over the entire circumferential direction of the molded product (P) can be easily handled even when the positions and shapes are different. Is possible.

  According to the undercut processing mechanism described in [6] above, each slide member (30) is set to a length corresponding to the die cutting stroke of the molded product (P). Thereby, it becomes possible to respond freely from a large stroke to a small stroke in the die cutting of the molded product (P).

  According to the undercut processing mechanism described in [7], the holder (40) itself is configured as a part surrounding the hollow portion of the movable mold (13) or the fixed mold (12) provided with the holder (40). . That is, a hollow portion serving as a substitute for the internal space of the holder (40) is directly formed in the mold, and each slide member (30) is slidably accommodated in the molding position and the release position in the hollow portion. It ’s fine. This eliminates the need for the holder (40) parts, reduces the number of parts, further simplifies the overall configuration of the molding die apparatus (10, 10A), and further reduces the cost. It becomes.

According to the undercut processing mechanism according to the present invention, it is possible to easily die-cut a molded product having an undercut portion on the outer peripheral side surrounding the inner hole of the molded product over the entire circumferential direction.
In addition, it can be compactly configured to meet the demand for space saving, can be easily processed and assembled into the mold, and the configuration is simple, so it does not take time and effort to assemble. Down can be realized.

Hereinafter, various embodiments representing the present invention will be described with reference to the drawings.
1 to 9 show a first embodiment of the present invention.
FIG. 1 and FIG. 2 are cross-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 when the molded product P is molded, and FIG. 2 shows a state when the molded product P is released.

  As shown in FIG. 1, the molded product P according to the present embodiment is a plate-like member as a whole, and includes a tubular protrusion P1 on the inner surface side thereof. The tubular protrusion P1 has an inner hole P10 that passes through the central axis thereof, and is provided with an undercut portion P11 having a concavo-convex shape in the entire circumferential direction along the outer peripheral side surrounding the inner hole P10, that is, the outer periphery of the tubular protrusion P1. ing. The material of the molded product P is not limited to a synthetic resin such as plastic, and a metal such as iron or copper is also applicable.

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

  The undercut processing mechanism that forms the basis of the present invention is a state in which the undercut portion P11 can be punched when the molded product P is punched. The pair of ejector pins 20 and 20 A pair of slide members 30, 30 that are connected to the holder 40 to which the portion 23 is slidably guided, the tip end portion 23 of each ejector pin 20, and are movably disposed in the holder 40, and each slide member 30. A pair of undercut molding cores 35, 35 supported at the tip of the core, a core 50 for molding the inner hole P10 of the molded product P, and the like.

  As shown in FIGS. 1 and 2, each ejector pin 20 is formed of a square bar member, and is erected on the ejector base plate 15 in parallel with each other. A base end portion 22 of each ejector pin 20 is fixed to the ejector base plate 15 via a knock pin 21. Each ejector pin 20 is driven in the die-cutting direction in accordance with the upward movement of the ejector base plate 15 and protrudes. The tip 23 of each ejector pin 20 is slidably inserted into a holder 40 described below.

  As shown in FIGS. 1 and 2, the holder 40 is integrally provided in the movable mold 13 while being accommodated in the movable mold 13. As shown in FIG. 3 to FIG. 9, the holder 40 is formed by combining two components, and is formed in a box shape with an upper end surface and a lower end surface opened. Inside the holder 40, a core 50 is arranged along its central axis, and the slide members 30 arranged in parallel in the left-right direction with the core 50 in between are formed at a molding position (see FIG. 1) and released from the mold, respectively. In addition to being slidably housed at a position (see FIG. 2), an internal space 41 (see FIG. 6) through which the tip 23 of each ejector pin 20 is inserted is formed.

  As shown in FIG. 6, a core 50 is built in the internal space 41 of the holder 40. In the holder 40, a core holding portion 42 for holding the core 50 arranged so as to extend along the central axis is formed. The core 50 has a tip 51 formed in a cylindrical shape corresponding to the inner hole P10 of the molded product P. The core 50 is detachably held with respect to the core holding portion 42 and can be exchanged with another core.

  Further, on both sides of the core holding portion 42, a pair of vertical hole portions 43, 43 through which the tip portions 23 of the respective ejector pins 20 are slidably inserted are formed. The upper side of each vertical hole portion 43 communicates with a storage portion 44 in which each slide member 30 is slidably stored in a molding position (see FIG. 1) and a release position (see FIG. 2). The storage portion 44 is opened as it is on the upper end surface of the holder 40.

  On the inner wall surface of the storage portion 44 in the internal space 41 of the holder 40, each slide member 30 is directed from the molding position to the mold release position when the molded product P is being die-cut. In addition, guide means is provided that guides along the inclination direction that moves simultaneously in the escape direction from the undercut portion P11 that intersects the die-cutting direction. This guide means is a pair of slant grooves 45, 45, and each slant groove 45 is recessed in the front and rear of the inner wall surface of the storage portion 44 so as to form a V-shape symmetrically.

  On the other hand, on the front and rear of the slide member 30 described below, oblique stripes 32 that are slidably fitted in the oblique grooves 45 are provided in a protruding manner. Here, the oblique groove 45 may be provided on either the holder 40 or the slide member 30, and the oblique line 32 is provided on either one of them. In short, any configuration may be used as long as the slide member 30 is guided so as to be movable in the above-described inclination direction during the die-cutting operation. In addition, the edge of the said accommodating part 44 opened to the upper end surface of the holder 40 becomes a cross-sectional shape which each slide member 30 penetrates and is guided so that it can move to the said inclination direction.

  As shown in FIGS. 4 to 9, each slide member 30 is formed of a piece-shaped member having the shape shown in the figure, and the above-described mold release direction (upward in FIG. 1) with respect to the tip portion 23 of each ejector pin 20. The base end portion is coupled so as to be slidable in the escape direction (left and right direction in FIG. 1) from the undercut portion P11 that intersects the direction). A holding piece portion 24 is provided at the distal end portion 23 of each ejector pin 20 so as to be slidable in the mold release direction within the holder 40. On the other hand, at the base end portion of the slide member 30, an escape operation piece portion 31 that is slidably connected to the holding piece portion 24 in the escape direction is provided.

  As shown in FIG. 6, the holding piece portion 24 is formed on the upper end surface of the distal end portion 23 of the ejector pin 20 as a ridge extending in the left-right direction perpendicular to the axial direction (vertical direction in FIG. 6) of the ejector pin 20. Is formed. On the other hand, the escape operation piece portion 31 of the slide member 30 is formed as a dovetail that is movably fitted to the protrusions of the holding piece portion 24 in the left-right direction. The holding piece portion 24 and the escape operation piece portion 31 are connected to each other so as to be able to be pushed and pulled, and are set so that the slide member 30 moves in the inclined direction as the ejector pin 20 protrudes.

  In addition, on the front and rear sides of the inclined surfaces facing the outside of the slide members 30, oblique ridges 32 are provided so as to extend slidably and slidably fit into the oblique grooves 45 in the holder 40. . Here, the oblique lines 32 are inclined in the same direction as the inclined grooves 45, that is, at the same angle as the inclined direction in which the slide member 30 moves. As described above, the configuration may be such that the oblique line 32 protrudes from the holder 40 while the oblique groove 45 is recessed from the slide member 30.

  As shown in FIGS. 1 to 5, an undercut molding core 35 for molding an undercut portion P <b> 11 of the molded product P is provided at a portion of the tip portion of each slide member 30 facing each other. The undercut molding core 35 according to the present embodiment is integrally provided at the distal end portion of the slide member 30, but the undercut molding core 35 is detachably provided as a separate body at the distal end portion of the slide member 30. You may do it.

Next, the operation of the molding die apparatus 10 according to the first embodiment will be described.
As shown in FIG. 1, a molded product P is molded by a molding die apparatus 10. At this time, in the holder 40 accommodated in the movable mold 13, the pair of slide members 30, 30 are close to each other, and the undercut portion 35 at the distal end portion of each slide member 30 causes the core 50 to move all the way. The molding positions are in contact with each other so as to surround from the 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, each ejector pin 20 erected on the ejector base plate 15 protrudes in the mold drawing direction (upward) so as to separate the molded product P from the movable mold 13.

  In FIG. 2, each slide member 30 connected to the tip 23 of each ejector pin 20 slides in the mold release direction together with the ejector pin 20 in the holder 40 accommodated in the movable mold 13. The tip end portion 23 of the ejector pin 20 also slides simultaneously in the escape direction intersecting with the mold release direction. Accordingly, the ejector pin 20 and the slide member 30 are relatively displaced.

  At the distal end portion 23 of the ejector pin 20, there is a convex holding piece portion 24 slidably arranged in the mold release direction within the movable die 13, and the holding piece portion is provided at the base end portion of the slide member 30. There is a dovetail-shaped relief motion piece 31 that is slidably connected to 24 in the relief direction. For this reason, the front-end | tip part 23 of the ejector pin 20 and the base end part of the slide member 30 can be reliably connected so that it may displace relatively in the state which can be pushed and pulled mutually.

  As the ejector pin 20 projects, each slide member 30 is guided in a die-cutting direction and a relief direction while the ridge 32 is slidably fitted and guided in the oblique groove 45 that is a guide means in the holder 40. Each moves in a tilt direction that moves simultaneously. Thereby, since each slide member 30 moves reliably from a molding position to a mold release position, the undercut part P11 of the molded product P will be in the state which can be die-cut. In this way, a molded product P having a complicated shape such that there is an uneven undercut portion P11 extending in the entire circumferential direction along the outer peripheral side surrounding the inner hole P10 of the tubular protrusion P1 can be easily formed. .

  The movement of each slide member 30 in the holder 40 is reliably and smoothly guided in the tilt direction by the fitting relationship between the ridges 32 of the slide member 30 and the oblique grooves 45 as guide means in the holder 40. . In addition, 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.

  Further, according to the undercut processing mechanism according to the present embodiment, the slide member 30 provided with the undercut molding core 35 is movable through the holder 40 without being dispersed in the ejector base plate 15 or 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. 3, the undercut processing mechanism can be configured as a unit that is preliminarily incorporated in the holder 40, and can be easily inserted into the movable mold 13 via the holder 40 as shown in FIG. Can be retrofitted. Such a configuration is suitable for a case where processing such as making a space for housing the holder 40 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, the slide members 30 and the undercut molding cores 35 are molded by being pulled by the ejector pins 20 as the ejector pins 20 return to the molding positions. Return to the initial position of the hour. Further, the fixed mold 12 also returns to the molding position, and the next molded product P is molded.

10 to 19 show a second embodiment of the present invention.
In the molding die apparatus 10A according to the present embodiment, the core 60 constituting the undercut processing mechanism is different from that of the first embodiment described above, and the basic configuration other than the core 60 is the same as that of the first embodiment. It is common with the molding die apparatus 10 of one embodiment. In addition, the molded product P according to the present embodiment has an undercut portion P12 that has three concavo-convex shapes, and is slightly different from the molded product P according to the first embodiment. Note that parts that are the same as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIGS. 10 and 11, the core 60 is not built in the holder 40 </ b> A in advance like the core 50 of the first embodiment, and is similar to the pair of ejector pins 20 and 20. It is slidably inserted into the holder 40A. As shown in FIGS. 16 and 17, the core 60 includes a sleeve 61 and a rod 64 that is slidably inserted into the sleeve 61. The tip portion 66 of the rod 64 is formed in a slightly tapered columnar shape corresponding to the inner hole P10 of the molded product P.

  As shown in FIGS. 10 and 11, the sleeve 61 of the core 60 is erected on the ejector base plate 15 so as to be positioned between the ejector pins 20 in a state parallel to the pair of ejector pins 20 and 20. Has been. Here, the base end portion 62 of the sleeve 61 is fixed to the ejector base plate 15. As the ejector base plate 15 moves upward, the sleeve 61 is driven in the die-cutting direction and protrudes. The distal end portion 63 of the sleeve 61 is slidably inserted into a holder 40A described below.

  On the other hand, the rod 64 is erected on the movable mounting plate 14 while being inserted through the sleeve 61. The rod 64 does not project together with the sleeve 61, and moves relative to the sleeve 61 in accordance with the projecting operation of the sleeve 61, and the tip 66 of the rod 64 is immersed in the sleeve 61. It will be. As shown in FIGS. 14 and 15, a core guide portion 42 </ b> A is formed in the holder 40 </ b> A to guide the sleeve 61 inserted along its central axis into a state where it can be inserted.

Next, the difference of the operation of the molding die apparatus 10A according to the second embodiment from the molding mold apparatus 10 according to the first embodiment will be described.
As shown in FIG. 10, when the molded product P is molded by the molding die apparatus 10A, the sleeve 61 and the rod 64 of the core 60 are both inserted into the holder 40A. At this time, the upper end surface (see FIG. 16) of the distal end portion 63 of the sleeve 61 represents the distal end surface of the tubular projection P1 in the molded product P, and the distal end portion 66 (see FIG. 16) of the rod 64 is tubular. An inner hole P10 of the protrusion P1 is formed.

  After the molding of the molded product P is completed and the fixed mold 12 is separated from the movable mold 13, the ejector base plate 15 is driven upward as shown in FIG. Then, each ejector pin 20 erected on the ejector base plate 15 protrudes in the mold drawing direction (upward) so as to separate the molded product P from the movable mold 13. In addition, the sleeve 61 of the core 60 also protrudes in the mold release direction (upward) so as to separate the tubular protrusion P1 of the molded product P.

  At this time, the rod 64 of the core 60 does not project together with the sleeve 61 and moves downward relative to the sleeve 61 as the sleeve 61 projects. Thereby, the tip portion 66 of the rod 64 is detached from the inner hole P10 of the tubular protrusion P1 in the molded product P.

  Further, as the ejector pin 20 projects, each slide member 30 is slidably fitted into the oblique groove 45 in which the oblique line 32 is a guide means in the holder 40, as in the case of the first embodiment. While being guided together, it moves in an inclination direction that simultaneously moves in the die-cutting direction and the escape direction. Thereby, each slide member 30 is reliably moved from the molding position to the mold release position, and the undercut portion P12 of the molded product P is in a state in which the mold can be removed.

  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, the slide members 30, and the undercut molded cores 35 are not limited to those specifically illustrated. Moreover, in each said embodiment, although each slide member 30 and the undercut shaping | molding core 35 were provided as two pairs, for example, three are provided radially, or five, six, seven or more And an appropriate number can be provided according to the arrangement space in the holder.

  Moreover, in each said embodiment, although all the undercut shaping | molding cores 35 in each slide member 30 are comprised in the same direction in the same direction, the undercut shaping | molding core 35 is comprised for every slide member 30, respectively. At least one may be different from the others, and the undercut portions P11 and P12 having different shapes may be formed.

  Moreover, in each said embodiment, although the ejector pin 20 was comprised from the square bar member, you may comprise by a round bar member. Although the same number of ejector pins 20 is prepared corresponding to each slide member 30, as another configuration, only one ejector pin 20 is provided, and the tip of the ejector pin 20 is connected to the base of each slide member 30. A plurality of holding piece portions 24 respectively corresponding to the relief operation piece portions 31 at the end portions may be provided together.

  In addition, by setting each slide member 30 to a length corresponding to the punching stroke of the molded product P, it is possible to appropriately cope with a large stroke to a small stroke in the punching of the molded product P. Further, by nitriding the portion where the slide member 30 and the holders 40 and 40A are in sliding contact, particularly the surfaces of the ridges 32 and the oblique grooves 45, it becomes possible to reduce the friction coefficient, and to operate more smoothly. be able to.

  Further, in each of the above embodiments, the undercut molded core 35 is provided integrally at the tip of the slide member 30 to simplify the structure and reduce the cost. You may make it provide in the front-end | tip part of the slide member 30 so that attachment or detachment is possible separately. Thereby, it becomes possible to replace with various undercut molding cores later, and versatility is expanded.

  In each of the above-described embodiments, the guide member for guiding each slide member 30 in the inclined direction is provided by providing the inclined groove 45 that fits the oblique line 32 of each slide member 30 in the holder 40, 40A. In addition, for example, a guide hole that is movably guided in a state where each slide member 30 penetrates and tilts is formed in the end surface portion of the holder 40, 40A to serve as guide means, or the holder 40, A groove that guides the entire outer periphery of each slide member 30 so as to be slidable may be provided inside 40A as guide means.

  Furthermore, in each of the embodiments described above, the holders 40 and 40A are provided integrally with the movable mold 13, but the holders 40 and 40A may be provided integrally with the fixed mold 12 instead of the movable mold 13. Moreover, you may comprise the holder 40, 40A itself as a part surrounding the hollow part in the movable mold | type 13 (or fixed mold | type 12).

  That is, it is only necessary to form a hollow portion instead of the internal space of the holders 40 and 40A directly in the mold 11 and house each slide member 30 and the like in this hollow portion. Thereby, the number of parts regarding the holder 40 can be reduced, the configuration of the molding die apparatuses 10 and 10A as a whole can be further simplified, and the cost can be reduced.

It is sectional drawing explaining the operation | movement at the time of shaping | molding of the shaping die apparatus which concerns on 1st Embodiment of this invention, and an undercut process mechanism. It is sectional drawing explaining the operation | movement at the time of die cutting of the shaping die apparatus which concerns on 1st Embodiment of this invention, and an undercut process mechanism. It is a perspective view showing the appearance of the whole undercut processing mechanism concerning a 1st embodiment of the present invention. It is a perspective view which removes a part of the holder of the undercut processing mechanism which concerns on 1st Embodiment of this invention, and shows an inside. It is a perspective view which shows the inside of the holder of the undercut process mechanism which concerns on 1st Embodiment of this invention. It is a perspective view which decomposes | disassembles and shows the undercut process mechanism which concerns on 1st Embodiment of this invention. It is a perspective view which shows the whole external appearance in the state which made the ejector pin of the undercut process mechanism which concerns on 1st Embodiment of this invention protrude. It is a perspective view which removes a part of a holder in the state which made the ejector pin of the undercut process mechanism which concerns on 1st Embodiment of this invention protrude, and shows an inside. It is a perspective view which shows the inside of the holder of the undercut process mechanism which concerns on 1st Embodiment of this invention. It is sectional drawing explaining the operation | movement at the time of shaping | molding of the shaping die apparatus and undercut process mechanism which concern on 2nd Embodiment of this invention. It is sectional drawing explaining the operation | movement at the time of die-cutting of the shaping die apparatus which concerns on 2nd Embodiment of this invention, and an undercut process mechanism. It is a perspective view which shows the external appearance of the whole undercut process mechanism which concerns on 2nd Embodiment of this invention. It is a perspective view which removes a part of the holder of the undercut processing mechanism which concerns on 2nd Embodiment of this invention, and shows an inside. It is a perspective view which shows the inside of the holder of the undercut process mechanism which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the inside of the holder of the undercut process mechanism which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the core of the undercut process mechanism which concerns on 2nd Embodiment of this invention. It is a perspective view which decomposes | disassembles and shows the core of the undercut process mechanism which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the connection relation of the slide member and ejector pin of the undercut process mechanism which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the state which combined the slide member, ejector pin, and core of the undercut process mechanism which concerns on 2nd Embodiment of this invention.

Explanation of symbols

P ... Molded product P1 ... Tubular protrusion P10 ... Inner hole P11 ... Undercut part P12 ... Undercut part 10 ... Molding die device 10A ... Molding die device 11 ... Mold 12 ... Fixed die 13 ... Movable die 14 ... Movable mounting plate 15 ... ejector base plate 20 ... ejector pin 21 ... knock pin 22 ... base end portion 23 ... tip end portion 24 ... holding piece portion 30 ... slide member 31 ... escape action piece portion 32 ... oblique strip 35 ... undercut molding core 40 ... Holder 40A ... Holder 41 ... Inner space 42 ... Core holding part 42A ... Core guide part 43 ... Vertical hole part 44 ... Storage part 45 ... Slant groove 50 ... Core 51 ... Tip part 60 ... Core 61 ... Sleeve 62 ... proximal end 63 ... distal end 64 ... rod 66 ... distal end

Claims (7)

In a molding die apparatus for molding a molded product with a fixed mold and a movable mold, an undercut processing mechanism for making an undercut portion in the molded product in a state where it can be punched when the molded product is punched. ,
A core having a shape corresponding to the inner hole in the molded article;
An undercut molding core having a shape corresponding to the undercut portion on the outer peripheral side surrounding the inner hole of the molded product, and being divided and arranged in a state of surrounding the core from the outside;
A plurality of slide members arranged in a state in which each of the undercut molded cores is opposed to each other with the core interposed therebetween, with each of the undercut molded cores supported at the tip part one by one,
A molding position that is provided in the fixed mold or the movable mold, and the respective slide members are in contact with each other so that the undercut portions at the respective distal ends surround the core from the entire circumferential direction; and A holder that is housed in a slidable state at mold release positions spaced apart from each other with a core in between,
In the holder, when the molded product is die-cut, each slide member is directed from the molding position to the mold release position, and intersects the die-cutting direction parallel to the axis of the core and the die-cutting direction. An undercut processing mechanism, characterized in that guide means is provided for guiding in the direction of escaping from the undercut portion along the inclined direction that moves simultaneously. Corresponding to each of the slide members, it has a plurality of ejector pins that are driven in the die-cutting direction to project.
The holder is installed in the movable mold in a state in which the tip of each ejector pin is movably guided.
Each of the slide members is connected so that each base end portion is slidable in the escape direction with respect to a tip portion of the ejector pin,
Either one of the inner wall of the holder and the outer wall of each slide member is provided with a plurality of oblique grooves extending in the tilt direction in which each slide member moves, and the other is also extended in the tilt direction and is also extended in the tilt direction. 2. The undercut according to claim 1, wherein a plurality of swashes that are slidably fitted in each swash groove are provided, and each swash groove or each swash in the holder is used as the guide means. Processing mechanism.   3. The undercut processing mechanism according to claim 1, wherein the undercut molding core is integrally provided at a tip portion of each corresponding slide member. 4.   3. The undercut processing mechanism according to claim 1, wherein the undercut forming core is detachably provided as a separate member at a distal end portion of each corresponding slide member. 4.   5. The undercut molded core according to claim 1, 2, 3, or 4, wherein at least one of the undercut molded cores is different from the other for each of the slide members and can form undercut portions having different shapes. Undercut processing mechanism.   6. The undercut processing mechanism according to claim 1, 2, 3, 4, or 5, wherein each slide member is set to a length corresponding to a die cutting stroke of the molded product.   The undercut processing mechanism according to claim 1, 2, 3, 4, 5 or 6, wherein the holder is configured as a part surrounding a hollow portion in the movable type or the fixed type provided with the holder. .

Images