JP2010264682A - Mold and method of manufacturing molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold which is easily replaceable of a replacement die corresponding to an undercut. <P>SOLUTION: A mold 1 includes: a stationary mold 2; a movable mold 3 which forms a space 16 corresponding with a molded article 15, between the stationary mold 2 and the movable mold 3; a replacement die 21 which is detachably built in the movable mold 3 and includes an oblique through hole 31; an in-die slide 23 which includes a projection part 33 for forming an undercut 15c and is formed equal to or shorter than the thickness T of the replacement die 21 and further, is slidably arranged in the through hole 31, with such a behavior that the in-die slide 23 moves obliquely in the direction where the projection part 33 leaves the undercut 15c, when pushed facing the stationary mold 2; an ejector plate 35 which moves facing the stationary mold 2; and an ejection pin 41 which extends facing the in-die slide 23 from the ejector plate 35 and ejects the in-die slide 23 toward the stationary mold 2. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a mold for molding a molded article having an undercut, and a method for manufacturing a molded article using the mold.

  The molded product may have an undercut (a recess formed on the side surface of the molded product). The mold may be provided with an exchange piece in a portion corresponding to the undercut.

  Patent Document 1 discloses a mold structure in which a fixed mold and a movable mold are each constituted by a main mold and a detachable nest attached to the main mold. In this mold structure, the main mold is provided with an extrusion mechanism. A hollow portion formed between the main mold and the insert is provided with an extrusion plate that is pushed by the extrusion mechanism. The insert is provided with an extrusion pin supported by the extrusion plate.

Japanese Utility Model Publication No. 63-38072

  By the way, the exchange piece corresponding to an undercut is provided with the inclination slide for forming an undercut. This inclined slide passes through the movable mold plate to which the core block is attached from the exchange piece, and is connected to an ejector plate disposed near the movable attachment plate.

  For this reason, when exchanging the exchange piece, it is necessary to disassemble the mold movable side, change the ejector plate and exchange piece, further change the inclined slide, and reassemble the mold. This replacement work takes time and cost, and cannot be said to be efficient.

  The objective of this invention is providing the metal mold | die which can replace | exchange the exchange piece corresponding to an undercut easily, and the manufacturing method of the molded article using the metal mold | die.

  A mold according to one aspect of the present invention is a mold in which a molded product having an undercut is molded, and a space corresponding to the molded product is formed between the fixed mold and the fixed mold. A movable mold that is detachably incorporated in the movable mold and has an inclined through hole, and a protrusion that forms the undercut, and is the same as the thickness of the exchange piece or the thickness of the exchange piece A slide in the frame that is formed to be short, is slidably disposed in the through-hole, and moves so as to be inclined in a direction away from the undercut when the projection is pushed toward the fixed mold, and the fixed An ejector plate that moves toward the mold, and an extrusion pin that extends from the ejector plate toward the in-frame slide and pushes the in-frame slide toward the fixed mold.

  A method for manufacturing a molded product according to one embodiment of the present invention is a method for manufacturing a molded product having an undercut, and a space corresponding to the molded product is formed between the fixed mold and the fixed mold. A movable mold that is detachably incorporated in the movable mold and has an inclined through hole, and a protrusion that forms the undercut, and is the same as the thickness of the exchange piece or the thickness of the exchange piece A slide in the frame that is formed to be short, is slidably disposed in the through-hole, and moves so as to be inclined in a direction away from the undercut when the projection is pushed toward the fixed mold, and the fixed Prepared a mold comprising: an ejector plate that moves toward the mold; and an extrusion pin that extends from the ejector plate toward the inner slide and pushes the inner slide toward the fixed mold. Closing the mold and injecting the molten material into the space, opening the mold and pushing out the extrusion pin toward the fixed mold, sliding the slide in the piece along the through hole, The molded product is removed from the mold.

  According to the present invention, the exchange piece corresponding to the undercut can be easily exchanged.

Sectional drawing of the metal mold | die which concerns on one Embodiment of this invention. Sectional drawing of the metal mold | die shown in FIG. Sectional drawing at the time of product molding of the metal mold | die shown in FIG. Sectional drawing at the time of product extraction of the metal mold | die shown in FIG. Sectional drawing which follows the F5-F5 line | wire in FIG. Sectional drawing of one modification of the metal mold | die shown in FIG. Sectional drawing which shows the exchange operation | work of the exchange piece of the metal mold | die shown in FIG. Sectional drawing which shows the exchange operation | work of the exchange piece of the metal mold | die shown in FIG. Sectional drawing which shows the exchange operation | work of the exchange piece of the metal mold | die shown in FIG. Sectional drawing of another modification of the metal mold | die shown in FIG. Sectional drawing of another modification of the metal mold | die shown in FIG. Sectional drawing of the metal mold | die provided with the inclination slide extended to the ejector plate.

  Hereinafter, a method for manufacturing a mold 1 and a molded product according to an embodiment of the present invention will be described with reference to FIGS. 1 to 12.

  FIG. 1 shows a mold 1 according to the present embodiment. The mold 1 can be widely used as a molding mold for plastics or metal, for example. The molded product molded by the mold 1 is a part that becomes a part of a casing of an electronic device such as a portable computer. The molded product to which the present invention can be applied is not limited to the above example, and the present invention can be widely applied to various parts.

  As shown in FIG. 1, the mold 1 includes a fixed mold 2, a movable mold 3 combined with the fixed mold 2, and guide pins 4 that guide the movable mold 3 with respect to the fixed mold 2. The fixed mold 2 has a fixed mold 6 and a cavity member 7 (cavity block).

  The fixed-side template 6 is fixed to the fixed-side mounting plate 8. The stationary-side template 6 has a recess 6 a to which the cavity member 7 is attached on the surface facing the movable mold 3. The cavity member 7 is attached to the recess 6 a and faces the movable mold 3. The cavity member 7 has, for example, a mold surface that forms a surface on the front side of the product.

  On the other hand, the movable mold 3 includes a movable mold plate 10 (core mold) and a core member 11 (core block). The movable mold 3 can be moved back and forth between a mold closing position combined with the fixed mold 2 and a mold opening position separated from the fixed mold 2. The movable side template 10 is fixed to the movable side mounting plate 13 via the spacer block 12.

  The movable side template 10 has a concave portion 10 a to which the core member 11 is attached on the surface facing the fixed die 2. The core member 11 is attached to the recess 10 a and faces the fixed mold 2. The core member 11 has, for example, a mold surface that forms a surface on the back side of the product. The mold 1 does not necessarily have the cavity member 7 and the core member 11, and the shape corresponding to the outer shape of the molded product is directly formed on the mold surfaces of the fixed mold 2 and the movable mold 3. Also good.

  As shown in FIGS. 1 and 2, when the movable mold 3 is combined with the fixed mold 2, a space 16 corresponding to the shape of the molded product 15 (product) is provided between the fixed mold 2 and the movable mold 3. (Cavity space) is formed. As shown in FIG. 3, the molded product 15 includes, for example, a product main portion 15a formed in a plate shape, and a protruding portion 15b protruding from the product main portion 15a to the movable mold 3 side. This protrusion 15b has an undercut 15c (a recess formed on the side of the product). For example, the undercut 15c is recessed in a direction orthogonal to the mold closing direction (D1 direction in FIG. 3).

  As shown in FIGS. 1 and 2, an exchange piece 21 is incorporated in the core member 11 so as to be detachable (replaceable). The exchange piece 21 is an exchange piece corresponding to the undercut 15c of the molded product 15, and is attached to a region where the undercut 15c is formed. More specifically, the exchange piece 21 is attached to the core member 11 and faces the space 16 formed between the fixed mold 2 and the movable mold 3. As shown in FIG. 2, the exchange piece 21 has a recess 22 that is recessed toward the movable mold 3 and corresponds to the protrusion 15 b of the molded product 15. A space 24 in which the protruding portion 15b of the molded product 15 is formed is formed between the concave portion 22 and the in-frame slide 23 described later.

  The exchange piece 21 has the same thickness T as the core member 11, for example, and is in contact with the movable side template 10. As illustrated in FIGS. 7 to 9, the core member 11 includes a core member main portion 26 and a pressing piece 27. The core member main portion 26 forms most of the core member 11 excluding the exchange piece 21 and the holding piece 27 and is fixed to the movable side template 10. The pressing piece 27 is fixed to the movable side template 10 by, for example, a screw 28 independently of the core member main portion 26. The exchange piece 21 is sandwiched between the core member main portion 26 and the holding piece 27 and is fixed to the movable side template 10. By removing the holding piece 27, the exchange piece 21 can be removed.

  As shown in FIG. 2, the exchange piece 21 according to the present embodiment has a built-in slide 23 (tilted slide). More specifically, the exchange piece 21 accommodates the in-frame slide 23 and has a through hole 31 for guiding the in-frame slide 23. The exchange piece 21 includes a first end face 21a facing the space 16 formed between the fixed mold 2 and the movable mold 3, and a second end face 21b opposite to the first end face 21a. Have. The through hole 31 passes through the exchange piece 21 from the first end surface 21a to the second end surface 21b.

  The through hole 31 communicates with the concave portion 22 corresponding to the protruding portion 15 b of the molded product 15 in the exchange piece 21. That is, the through hole 31 communicates with the space portion 24 in which the protruding portion 15b of the molded product 15 is formed. The through hole 31 extends with an inclination with respect to the direction from the movable mold 3 toward the fixed mold 2 (that is, the mold closing direction). Specifically, the through hole 31 moves away from the region where the undercut 15c is formed (that is, the space portion 24) as it proceeds in the direction from the movable mold 3 toward the fixed mold 2 (that is, the mold closing direction and the D1 direction). (In the direction away from).

  As shown in FIG. 2, the in-frame slide 23 is formed to have the same thickness T as the exchange piece 21, for example. The in-frame slide 23 may be formed shorter than the thickness T of the exchange piece 21 as shown in FIG. The in-piece slide 23 is slidably disposed in the through hole 31 of the exchange piece 21 and is accommodated in the exchange piece 21.

The in-frame slide 23 has a shape along the inner peripheral surface of the through hole 31 and is guided by the inner peripheral surface of the inclined through hole 31 so as to be inclined and movable. That is, the through hole 31 functions as a guide for guiding the slide 23 in the frame.

  The in-frame slide 23 includes a first end portion 23a facing the space 24 in which the protruding portion 15b of the molded product 15 is formed, and a second end portion 23b opposite to the first end portion 23a. Have In other words, a space 24 in which the protruding portion 15b of the molded product 15 is formed is formed between the first end portion 23a and the concave portion 22 of the exchange piece 21.

  The first end portion 23 a of the in-frame slide 23 protrudes toward the space 24 where the protruding portion 15 b of the molded product 15 is formed, and has a protruding portion 33 that forms an undercut 15 c in the molded product 15. That is, the protrusion 33 protrudes in parallel to a direction orthogonal to the mold closing direction (that is, the D2 direction).

  That is, as the in-frame slide 23 advances from the second end 23b toward the first end 23a, the protrusion 33 extends in an inclined direction away from the undercut 15c. As shown in FIG. 4, when the in-frame slide 23 is pushed toward the fixed mold 2, the in-frame slide 23 is guided by the through hole 31 of the replacement piece 21, and the protrusion 33 is separated from the undercut 15 c. Move to tilt.

  As shown in FIG. 1, the movable die 3 is provided with an ejector plate 35 and a retainer plate 36. The ejector plate 35 and the retainer plate 36 are bonded to each other and disposed in a space between the movable side mold plate 10 and the movable side mounting plate 13. The ejector plate 35 and the retainer plate 36 are disposed, for example, near the movable side mounting plate 13 and are movable toward the fixed mold 2.

  The movable side mounting plate 13 has a through hole 13a penetrating toward a molding machine (not shown). An ejector rod 37 of a molding machine is inserted into the through hole 13a. The ejector plate 35 and the retainer plate 36 are pushed by the ejector rod 37 of the molding machine and move toward the fixed mold 2. A plurality of extrusion pins (not shown) for extruding the molded product 15 from the mold 1 are attached to the ejector plate 35 when the mold is opened.

  As shown in FIG. 1, the ejector plate 35 is provided with an extruding pin 41 that is an in-frame slide-only extruding pin. The movable side template 10 has a through hole 10 b that faces the in-piece slide 23. The push-out pin 41 extends from the ejector plate 35 toward the in-frame slide 23 and is inserted into the through-hole 10 b and is in contact with the in-frame slide 23. The push pin 41 extends in the mold closing direction (that is, the D1 direction) of the movable mold 3. The push pin 41 moves in accordance with the ejector plate 35 and pushes the in-piece slide 23 toward the fixed mold 2.

  As shown in FIG. 2, between the push pin 41 and the slide 23 in the piece, the slide 23 in the piece is slid with respect to the push pin 41 in a direction orthogonal to the push direction of the push pin 41 (that is, the D2 direction). A sliding mechanism 42 is provided. As shown in FIG. 5, the sliding mechanism 42 according to the present embodiment is a V-groove portion 43 provided on the in-frame slide 23 and a rotating member 44 provided on the push pin 41.

  The V-groove 43 is provided, for example, on the end surface 23c (for example, the lower end surface) of the in-frame slide 23 that contacts the push pin 41. The V-groove 43 extends in a direction in which the in-frame slide 23 is separated from the undercut 15c (that is, the D2 direction).

  The rotating member 44 is, for example, a rotating disk provided at an end portion 41 a (for example, an upper end portion) of the push pin 41 that abuts on the slide 23 in the frame. The rotating member 44 is rotatable in the direction in which the in-frame slide 23 is separated from the undercut 15c (that is, the D2 direction). The rotating member 44 is not limited to a disk shape, and may be a spherical shape.

  As shown in FIG. 5, the rotating member 44 enters the V groove portion 43, and the two peripheral portions 44 a and 44 b of the rotating member 44 are in contact with the V groove portion 43. The rotating member 44 rotates along the V groove portion 43. Thereby, the friction between the slide 23 in a piece and the extrusion pin 41 is suppressed to the comparatively low state.

  Note that the sliding mechanism 42 may be formed by any one of the V-groove 43 and the rotating member 44. Furthermore, as shown in FIG. 6, a spherical portion 45 may be provided at the end portion 41 a of the push pin 41 that contacts the intra-piece slide 23, and the sliding mechanism 42 may be formed by the spherical portion 45. That is, the sliding mechanism 42 may not rotate. The structure of the sliding mechanism 42 is not particularly limited, and the frictional resistance between the extrusion pin 41 and the in-frame slide 23 is relatively small, and the sliding of the in-frame slide 23 with respect to the extrusion pin 41 is smooth. If so, the shape and mechanism are not particularly limited.

  As shown in FIG. 4, the through hole 31 of the exchange piece 21 is formed in such a size that the extrusion pin 41 does not interfere with the exchange piece 21 from the start of the extrusion of the extrusion pin 41 to the end of the extrusion. Yes. For example, the end surface 23 c (for example, the lower end surface) of the slide 23 in the frame is sufficiently wider than the end portion 41 a (for example, the upper end portion) of the push pin 41. That is, the dimension such as the width H of the through hole 31 is set so that the push pin 41 does not interfere with the exchange piece 21 from the start of the push of the push pin 41 to the end of the push.

  As shown in FIG. 2, the mold 1 is provided with a return mechanism 46 that returns the in-frame slide 23 into the replacement frame 21 when the in-frame slide 23 is pushed by the push pin 41. The return mechanism 46 is provided between the first support surface 47 provided on the inner slide 23, the second support surface 48 provided on the exchange piece 21, and the inner slide 23 and the exchange piece 21. A return spring 49 is provided.

  More specifically, the second end 23 b of the in-frame slide 23 has a protruding portion 23 d that protrudes in the horizontal direction with respect to the other portions of the in-frame slide 23. An internal space 50 is formed between the protruding portion 23 d and the exchange piece 21 in the moving direction of the in-frame slide 23. The first support surface 47 is a surface facing the fixed mold 2 of the protruding portion 23 d and faces the internal space 50. The second support surface 48 faces the first support surface 47 in the moving direction of the in-frame slide 23 with the internal space 50 interposed therebetween.

  The return spring 49 is provided between the first and second support surfaces 47 and 48 and biases the first support surface 47 in a direction away from the second support surface 48. When the inner slide 23 is pushed by the push pin 41, the return spring 49 applies a biasing force for biasing the inner slide 23 so as to return to the initial position (position not pushed by the push pin 41). .

  As shown in FIG. 2, the replacement piece 21 is provided with a stopper 51 that extends from the second support surface 48 toward the protrusion 23 d of the in-piece slide 23. The stopper 51 comes into contact with the protruding portion 23d of the pushed-in slide 23 and restricts the movement of the slide 23 in the piece.

  As shown in FIG. 1, the mold 1 has a return for reliably returning the ejector plate 35 moved toward the fixed mold 2 when the molded product is taken out to the initial position (position not pushed by the ejector rod 37). A pin 52 and a spring 53 are provided.

  Next, the exchange work of the exchange piece 21 of the mold 1 according to the present embodiment will be described.

  The exchange piece 21 is prepared in accordance with, for example, various undercut product shapes. When an undercut product is created and then a different undercut product is created, the exchange piece 21 is exchanged with another exchange piece 21. Is done.

  FIG. 7 shows the mold 1 before replacement. The holding piece 27 is removed by removing the screw 28 of the holding piece 27 from this state. As a result, the exchange piece 21 can be removed as shown in FIG. At this time, the in-frame slide 23 is removed together with the replacement frame 21.

  Next, as shown in FIG. 9, a desired exchange piece 21 is attached. Specifically, the exchange piece 21 is first attached to the core member 11, and then the holding piece 27 is attached and the screw 28 is fastened. Thereby, the exchange piece 21 is fixed. At this time, the in-frame slide 23 is attached integrally with the exchange piece 21. As described above, the exchange piece 21 can be exchanged without opening all the mold movable sides.

  Next, the manufacturing method of the molded product 15 using the metal mold | die 1 which concerns on this embodiment is demonstrated.

  First, the above-described mold 1 is prepared, and this mold 1 is set in a molding machine. Also, a raw material (for example, synthetic resin or metal) is melted to obtain a molten material. The molding cycle is then entered. First, the movable mold 3 is moved to close the mold 1. Then, the mold 1 is clamped and a molten material is injected into the space 16 in the mold 1. When the solidification of the molded product 15 proceeds to some extent, the movable mold 3 is moved to open the mold 1, and the ejector plate 35 is moved to take out the molded product from the mold 1.

  At this time, the push pin 41 is pushed out toward the fixed mold 2 in conjunction with the movement of the ejector plate 35. As a result, as shown in FIG. 4, the in-frame slide 23 slides in a direction inclined along the inner surface of the through hole 31. Further, the in-frame slide 23 also slides with respect to the push pin 41 via the sliding mechanism 42.

  As shown in FIG. 4, when the in-frame slide 23 is inclined and moved, the protrusion 33 of the in-frame slide 23 is detached from the undercut 15 c of the molded product 15, and the molded product 15 is removed from the mold. After the molded product 15 is removed, the in-frame slide 23 is returned to the initial position by the urging force of the return mechanism 46. This completes one molding cycle.

  According to the mold 1 having such a configuration, the exchange piece 21 corresponding to the undercut can be easily replaced, and the mold 1 which is not easily damaged can be obtained.

  First, with reference to FIG. 12, the metal mold | die 100 provided with the inclination slide 101 extended from the exchange piece 21 to the ejector plate 35 is demonstrated. As shown in FIG. 12, the inclined slide 101 passes through the movable side template 10 from the exchange piece 21 and is connected to the ejector plate 35. The inclined slide 101 extends from the exchange piece 21 to the ejector plate 35 while being inclined.

  When exchanging the exchange piece 21 in such a mold 100, the mold movable side is completely disassembled once, the ejector plate 35 and the exchange piece 21 are replaced, the inclined slide 101 is replaced, and the mold 1 is replaced. Must be reassembled. This replacement work takes time and cost.

  Moreover, in the said metal mold | die 100, since the inclination slide 101 is long, intensity | strength becomes weak and buckling, damage, and a deformation | transformation are easy to produce during use of the metal mold | die 100. FIG. If buckling, breakage, or deformation occurs in the inclined slide 101, an operation for exchanging the inclined slide 101 is required, which further increases costs.

  On the other hand, in the mold 1 according to the present embodiment, an in-frame slide 23 that is the same as the thickness T of the exchange piece 21 or shorter than the thickness T of the exchange piece 21 is provided. Built in. The in-frame slide 23 is independent of the ejector plate 35 and the push pin 41. For this reason, when exchanging the exchange piece 21, it is not necessary to disassemble all the mold movable sides, and the exchange piece is maintained while maintaining the assembly of the movable side mold plate 10, the ejector plate 35, the movable side mounting plate 13, and the like. 21 can be exchanged. As a result, shortening of the construction period and cost reduction can be expected.

  Furthermore, according to the mold 1 according to the present embodiment, the in-piece slide 23 is less likely to buckle, break, or deform. In other words, the in-frame slide 23 is shorter than the inclined slide 101 as shown in FIG. For this reason, the in-frame slide 23 has a higher strength than the inclined slide 101 and the like, and is less likely to buckle, break, or deform.

  Furthermore, even if buckling, breakage, or deformation occurs in the slide 23 in the frame, the restoration work can be performed more easily than the inclined slide 101 or the like. That is, it is not necessary to disassemble all the mold movable sides, and the in-piece slide 23 can be repaired or replaced while maintaining the assembly of the movable mold plate 10, the ejector plate 35, the movable mounting plate 13, and the like. it can.

  Here, as one of the molding technologies, a rapid heat cycle molding technology (Rapid Heat Cycle Molding; RHCM) (registered trademark) is known. High-speed heat cycle molding technology is expected to improve mold transferability, reduce filling pressure, and relax orientation by rapidly heating and cooling the mold.

  When applying the high-speed heat cycle molding technique in the mold 1 having the inclined slide 101 extending to the ejector plate 35 as shown in FIG. Since the thermal expansion of the part extending outside the exchange piece 21 is different from each other and it is necessary to consider the difference in thermal expansion, it is relatively difficult to apply.

  On the other hand, according to the mold 1 according to the present embodiment, since the in-frame slide 23 is accommodated in the exchange piece 21, there is substantially no need to consider the difference in partial thermal expansion of the in-frame slide 23. . That is, it can be said that the metal mold | die 1 which concerns on this embodiment is suitable for a high-speed heat cycle molding technique, and can apply the said technique comparatively easily.

  When a sliding mechanism 42 for sliding the in-frame slide 23 with respect to the extrusion pin 41 is provided in a direction orthogonal to the extrusion direction of the extrusion pin 41, it moves along the mold closing direction (that is, the D1 direction) of the mold 1. It is possible to smoothly slide the in-piece slide 23 that moves while being inclined with respect to the pushing pin 41 that is to be moved. This contributes to further suppression of buckling, breakage, and deformation of the slide 23 in the frame. When the sliding mechanism 42 is formed by the rotating member 44, the V groove portion 43, the spherical portion 45, or the like, the sliding mechanism 42 can be realized with a relatively simple structure.

  When the return mechanism 46 for returning the in-frame slide 23 into the exchange piece 21 is provided, the in-frame slide 23 that does not follow the ejector plate 35 can be reliably returned into the exchange piece 21.

  If the through hole 31 is formed so that the push pin 41 does not interfere with the exchange piece 21 from the start of the push pin 41 to the end of the push, the push pin 41 is pushed out when the slide 23 is pushed out. The pin 41 can enter the through hole 31. Thereby, the mechanism which pushes out the slide 23 in a piece can be implement | achieved by a comparatively simple structure.

  As mentioned above, although the metal mold | die 1 which concerns on one embodiment of this invention, and the manufacturing method of a molded article were demonstrated, this invention is not limited to these. The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage.

  In the above embodiment, the exchange piece 21 is attached to the core member 11 by the holding piece 27. In addition, this invention is not limited to the said form, For example, as shown in FIG. 11, you may attach the exchange piece 21 to the movable side template 10 directly with the screw | thread 28 etc. As shown in FIG.

  DESCRIPTION OF SYMBOLS 1 ... Metal mold | die, 2 ... Fixed mold | type, 3 ... Movable type | mold, 11 ... Core member, 15 ... Molded article, 15c ... Undercut, 16 ... Space part, 21 ... Replacement piece, 23 ... Slide in piece, 35 ... Ejector plate 41 ... Extrusion pin, 42 ... Sliding mechanism, 43 ... V-groove, 44 ... Rotating member, 45 ... Spherical part, 46 ... Return mechanism.

Claims (11)

A mold for molding a molded product having an undercut,
Fixed type,
A movable mold that forms a space corresponding to the molded product between the fixed mold and the fixed mold,
An exchange piece that is detachably incorporated in the movable mold and has an inclined through hole;
When it has a projection that forms the undercut, is formed to be the same as or shorter than the thickness of the exchange piece, is slidably disposed in the through hole, and is pushed toward the fixed mold And a slide in the piece that is inclined and moved away from the undercut.
An ejector plate that moves toward the fixed mold;
An extrusion pin that extends from the ejector plate toward the slide in the piece, and pushes the slide in the piece toward the fixed mold;
A mold characterized by comprising: The mold according to claim 1, wherein
A die comprising a sliding mechanism for sliding the in-frame slide with respect to the push pin in a direction perpendicular to the push-out direction of the push pin. The mold according to claim 2,
A die having a return mechanism for returning the in-frame slide into the exchange frame when the in-frame slide is pushed by the push pin. The mold according to claim 3,
The mold is characterized in that the through hole is formed in a size that does not interfere with the exchange piece from the start of extrusion of the extrusion pin to the end of extrusion. The mold according to claim 2,
The metal mold according to claim 1, wherein the sliding mechanism is a spherical portion provided at an end portion of the push pin that contacts the slide in the frame. The mold according to claim 2,
The metal mold according to claim 1, wherein the sliding mechanism is a rotating member that is provided at an end of the push-out pin and abuts against the slide in the frame. The mold according to claim 2,
The mold is characterized in that the sliding mechanism is a V-groove provided on an end surface of the in-piece slide that contacts the push pin, and the protrusion extends in a direction away from the undercut. A method for producing a molded article having an undercut,
Fixed type,
A movable mold that forms a space corresponding to the molded product between the fixed mold and the fixed mold,
An exchange piece that is detachably incorporated in the movable mold and has an inclined through hole;
When it has a projection that forms the undercut, is formed to be the same as or shorter than the thickness of the exchange piece, is slidably disposed in the through hole, and is pushed toward the fixed mold And a slide in the piece that is inclined and moved away from the undercut.
An ejector plate that moves toward the fixed mold;
An extrusion pin extending from the ejector plate toward the in-frame slide and pushing the in-frame slide toward the fixed mold, and preparing a mold,
Close the mold and inject molten material into the space,
Open the mold and push the extrusion pin toward the fixed mold, slide the slide inside the piece along the through hole, and remove the molded product from the mold,
A method for producing a molded product characterized by the above. In the manufacturing method of the molded article according to claim 8,
A method for producing a molded product, wherein a sliding mechanism for sliding the in-frame slide with respect to the extrusion pin is provided in the mold in a direction perpendicular to the extrusion direction of the extrusion pin. In the manufacturing method of the molded article according to claim 8,
A method of manufacturing a molded product, wherein a return mechanism is provided in the mold for returning the in-frame slide into the exchange piece when the in-frame slide is pushed by the push pin. In the manufacturing method of the molded article according to claim 8,
The method of manufacturing a molded product, wherein the through hole is formed in a size that does not interfere with the exchange piece from the start of extrusion of the extrusion pin to the end of extrusion.

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