KR100838787B1 - Assembly of slide core for for insert injection molding and mold assembly having this and - Google Patents

Abstract

A slide core assembly for insert injection molding, a mold assembly with the same, and an insert injection molding method using the same are provided to prevent a defect of a product and damage to a mold by placing an insert part of a product having an undercut part accurately. A slide core assembly(70) for insert injection molding comprises the followings: a first slide(71) including an insert groove(75) for inserting an insert part of a product, a sliding core(73) forming an undercut part of the product, and a guide rib(79) formed at an outer surface in a longitudinal direction; and a second slide(80) coupled with the first slide selectively at the other side of the sliding core, including a pin guide hole(81) penetrated by an angular pin at an inclined angle, and a guide rib(89) connected to the guide rib of the first slide.

Description

Slide core assembly for insert injection, mold assembly having same and insert injection method using same {Assembly of slide core for for insert injection molding and mold assembly having this and}

1 is a cross-sectional view showing the overall configuration of a preferred embodiment of a mold assembly to which the slide core assembly according to the present invention is applied.

Figure 2 is a perspective view showing the configuration of a preferred embodiment of a slide core assembly according to the present invention.

Figure 3 is an exploded perspective view showing a configuration in which the slide core assembly of the embodiment of the present invention is coupled to the guide rail and the stopper of the mold assembly.

Figure 4 is a cross-sectional view showing the configuration of the mold assembly in the open state according to an embodiment of the present invention.

Figure 5 is a flow chart showing the sequence of a preferred embodiment of the insert injection method according to the present invention.

Explanation of symbols on the main parts of the drawings

30: first fixing plate 32: first plate

34: 1st core 36: 1st shape core

38: angular pin 39: support piece

50: second fixing plate 52: spacer block

56: Second Edition 58: Second Main Core

60: second shape core 62: product cavity

64: Insert 66: Push Pin

70: slide core assembly 71: first slide

73: slide core 74: forming groove

75: insert groove 76: hook groove

79: guide rib 80: second slide

81: pin guide hole 82: mounting groove

85: hanger bar 89: guide rib

90: stopper

The present invention relates to a mold assembly, and more particularly, to an insert injection mold assembly in which a slide core on which an insert is mounted is selectively removable in performing insert injection molding, and an insert injection method using the same.

Injection molding is performed in the mold assembly to inject the molten synthetic resin into a cavity of a predetermined shape to form the product. Products made by injection molding mainly used synthetic resins, but recently, insert injection methods have been developed in which an insert is inserted into the cavity to be integrally molded. For example, a connector is manufactured such that a terminal, which is a metal insert, is integrally installed in a housing made of synthetic resin. In the case of inserting a separate insert into a product made of synthetic resin, the position of the insert should be set correctly in the product.

However, when an undercut or the like is provided on a product and a part of the insert is to be configured to be exposed to the outside of the product, a slide core must be used in the mold assembly. In this case, the insert is accurately fixed in the cavity of the mold assembly. There is a difficult problem.

In particular, a part of the insert should be inserted into the insert groove formed in the slide core. If the insert is not correctly inserted into the insert groove of the slide core in the process of closing the mold assembly, a defect occurs while the insert is misaligned. There is a problem that damage occurs to the mold in the process.

Therefore, an object of the present invention is to solve the problems of the prior art as described above, in the mold assembly using the slide core so that the insert is accurately positioned in the insert groove of the slide core.

According to a feature of the present invention for achieving the object as described above, the present invention is the first slide core is provided with an insert groove into which the insert of the product is inserted, the slide core is formed to form the undercut portion of the product, And a second slide core selectively coupled to the first slide core on the other side of the slide core.

Hook grooves and hook bars are formed at positions corresponding to each other on the first slide and the second slide, and are selectively coupled to each other.

The hook bar is provided to be rotatable on the second slide through the fastener in a direction perpendicular to the extending direction.

The front end of the hanger bar is provided to protrude outward of the second slide and the end thereof is located in the mounting groove formed in the second slide, so that the end of the hanger bar rotates in the rotation space formed in the mounting groove. The tip of the hanger bar is selectively hooked to the hanger groove of the first slide.

The mounting groove of the second slide is provided with an elastic member to provide an elastic force in the direction away from the second slide at the end of the hanger bar.

The second slide is formed with a pin guide hole through which the angular pin is inclined.

Guide ribs connected to each other are formed to protrude from the outer surfaces of the first slide and the second slice.

According to another feature of the invention, the present invention is a first shape core provided in the first plate provided on the first fixing plate, and a second shape core provided in the second plate provided on the second fixing plate facing the first fixing plate And a slide core assembly which is operated by the relative movement of the first fixing plate and the second fixing plate to form an undercut portion of the product, wherein the slide core assembly includes a slide core that forms an insert portion of the product. And a first slide core provided and a second slide core selectively coupled to the first slide core on the other side of the slide core.

A pin guide hole is formed to be inclined in the second slide, and the first fixing plate is provided with an angular pin. When the first fixing plate and the second fixing plate are closed, the second slide is guided by the angular pin to move in the first slide direction. Move and fasten to each other.

A guide rail is provided on the second template, and guide ribs corresponding to the guide rail are connected to the first slide and the second slide.

The second template is provided with a stopper to limit the moving range of the slide core assembly.

According to another feature of the invention, the invention (A) positioning the insert to be inserted into the product with the mold open, (B) the first slide provided with the slide core toward the insert Adjusting the slide core and the insert to a position corresponding to each other; (C) as the mold is closed, a second slide is guided by an angular pin and fastened to the first slide; D) the product is injected.

At this time, the present invention (E) at the same time the mold is opened and the product is taken out, the first slide and the second slide is guided by the angular pin to move in a direction away from the product, (F) And separating the first slide and the second slide from each other. And step (A) to (F) may be repeated.

According to the present invention having such a configuration, the slide core is provided in the slide which can be selectively tightened, and the work can be performed while the insert is correctly inserted into the insert groove of the slide core, thereby improving workability and damaging the mold. There is an advantage that can be prevented.

Hereinafter, a preferred embodiment of an insert injection slide core assembly according to the present invention, a mold assembly having the same, and an insert injection method using the same will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a preferred embodiment of a mold assembly to which the slide core assembly according to the present invention is applied, and FIG. 2 is a perspective view showing a configuration of a preferred embodiment of the slide core assembly according to the present invention. 3 is an exploded perspective view showing a structure in which the slide core assembly of the embodiment of the present invention is coupled to the guide rail and the stopper of the mold assembly, and FIG. .

As shown in these figures, the first fixing plate 30 is provided on the fixed side of the molding machine. The first fixing plate 30 is a plate having a predetermined area, and the first mold plate 32 is installed on one surface thereof. Description of the structure in which the first mold plate 32 and the first fixing plate 30 are coupled to each other is omitted.

The first main core 34 is installed through the first mold 32. A plurality of first shape cores 36 are provided to form a group through the first main core 34. The number of the first shape cores 36 forming one group depends on the shape of the product. The first shape core 36 is actually provided with a surface corresponding to the outer surface of the product, one group of the first shape core 36 is used for the production of one product.

An angular pin 38 is inclined to penetrate the first mold plate 32 in the first fixing plate 30. The angular pin 38 serves to drive the slide core assembly 70 to be described below. Reference numeral 39 denotes a support piece so that the slide core assembly 70 to be described below is not pushed by the injection pressure.

The locating ring 49 is installed on the first fixing plate 30, and the locating ring 49 allows the first fixing plate 30 to be coupled to the fixed side of the molding machine. A location corresponding to the center of the locating ring 49 is provided with an injection hole (not shown) into which molten resin as a product material is injected.

The second fixing plate 50 is installed on the movable side of the molding machine. The second fixing plate 50 also has a plate shape having an area corresponding to that of the first fixing plate 30. A supporting plate 54 is installed on the second fixing plate 50 by a spacer block 52, and a second template 56 is installed on the supporting plate 54 so as to face the first plate 32. The first mold plate 32 and the second mold plate 56 are in close contact with each other when the product is molded, and are separated when the molded product is taken out. This is done by moving the movable side of the molding machine relative to the stationary side. On the other hand, the configuration for taking out the molded product provided between the second fixing plate 50 and the support plate 54 is not the gist of the present invention, and description thereof is omitted for convenience.

Although not shown in FIG. 1, the guide rails 57 are mounted on the second template 56. The guide rail 57 is fixed to the second template 56 to serve to guide the slide assembly 70 to be moved along the second template 56 to be described below. )

The second main core 58 is installed through the second mold 56. The second main core 58 is installed at a position corresponding to the first main core 34. The second shape core 60 is installed through the second main core 58. Like the first shape core 36, a plurality of the second shape cores 60 form a group. Each group of the second shape cores 60 is installed at a position corresponding to each group of the first shape cores 36.

The product cavity 62 having a shape corresponding to that of the product is formed by the first shape core 36, the second shape core 60, and the slide core assembly 70 to be described below. The product cavity 62 is mainly formed by the first shape core 36 and the second shape core 60, and an undercut portion is formed in the slide core assembly 70.

Inside the product cavity 62 is an insert 64 which is integrally inserted into the product. The insert 64 is, for example, a terminal if the product to be made is a connector. And the part made of synthetic resin corresponds to the housing of the connector.

A fixing pin 66 for holding the position of the insert 64 protrudes through any one of the second shape cores 60. The fixing pin 66 penetrates through the second shape core 60 while being supported by the support plate 54 to protrude into the product cavity 62. Of course, the fixing pin 66 penetrates through holes (not shown) formed in the insert (64).

The second core plate 56 is provided with a slide core assembly 70. The slide core assembly 70 is for forming an undercut portion of the product, and the slide core 73 to be described below constitutes a part of the shape of the product.

As shown in FIG. 2, the slide assembly 70 is composed of a first slide 71 and a second slide 80. A slide core 73 is mounted on the first slide 71 to form an undercut portion of the product. That is, forming grooves 74 into which a part of the product is inserted are formed in the slide core 73, and insert grooves 75 into which the inserts are inserted are formed in the forming grooves 74. The slide core 73 may be formed integrally with the first slide 71 or may operate in a coupled state by using fasteners as separate pieces.

A hook groove 76 is formed in the first slide 71. The hook groove 76 is a portion in which an outer surface of the first slide 71 is partially recessed, and the hook bar 85 of the second slide 80 to be described later is hooked. In this embodiment, the hook groove 76 is formed to be symmetrical to both side surfaces of the first slide (71).

Guide ribs 79 are formed on the first slide 71. The guide rib 79 is formed to protrude on the outer surface of the first slide 71 so that the first slide 71 is guided by the guide rail 57. That is, the guide rib 79 is formed in a shape corresponding to the guide rail 57, the first slide 71 is to move along the upper surface of the second mold plate 56.

The second slide 80 is coupled to the first slide 71. The second slide 80 constitutes a slide core assembly 70 together with the first slide 71, and is selectively coupled to the first slide 71.

The pin guide hole 81 is inclined to pass through the second slide 80. The angular pin 38 is inserted into the pin guide hole 81 so that the second slide 80 moves along the upper surface of the second mold 56 as the angular pin 38 moves. . That is, even when the first slide 71 and the second slide 80 are separated from each other, when the mold is closed, the second slide 80 is formed along the angular pin 38. It moves in the direction of one slide (71), and the hook bar 85 is configured to be hooked on the hook groove 76.

Mounting grooves 82 are formed in the second slide 80. The mounting groove 82 is a portion on which one side of the hook bar 85 is seated and is formed by recessing a portion of the outer surface of the second slide 80. In the present embodiment, the mounting grooves 82 are formed on both sides of the second slide 80 similarly to the hook groove 76 of the first slide 71. At this time, the mounting groove 82 is formed so as to be sufficiently recessed so that the end (85b) of the hanger bar 85 to be described later to rotate by a predetermined radius.

The second slide 80 is provided with a hook bar 85. The hook bar 85 is hooked to the hook groove 76 and serves to fasten the two slides 71 and 80 to each other, and is formed in a substantially bar shape. At this time, the hook bar 85 is penetrated by the fastener B in a direction orthogonal to the extending direction, and is provided to be rotatable on the second slide 80.

More precisely, the tip 85a of the hanger 85 is provided to protrude outwardly of the second slide 80, that is, in the direction of the first slide 71, and the distal end 85b of the hanger 85 is mounted in the mounting groove. 82 is provided. Accordingly, when the distal end 85b of the hook bar 85 rotates in the mounting groove 82, the tip 85a of the hook bar 85 rotates relative to the fastener B. FIG. As a result, the hanger 76 of the first slide 71 hangs or is separated. Of course, the hook bar 85 may be provided on the first slide 71, and the hook groove 76 may be provided on the second slide 80.

At this time, the front end (85a) of the hanger 85 is formed to narrow the width toward the second slide (80) direction. This is to guide the front end 85a of the hook bar 85 to be more easily rotated along the outer surface of the first slide 71.

At the tip of the hanger 85, the hanger jaw 86 is formed to protrude. The hanger jaw 86 is formed in a shape corresponding to the shape of the hanger groove 76, so that the hanger bar 85 can be more firmly hooked to the hanger groove (76).

At this time, the mounting groove 82 is provided with an elastic member (87). The elastic member 87 is provided between the mounting groove 82 and the distal end 85b of the hanger bar 85 so that the distal end 85b of the hanger bar 85 is separated from the second slide 80. It provides elastic force in the direction away. That is, the elastic member 87 is to provide a force to the hanger (85) to keep the front end (85a) of the hanger (85) in the direction close to each other. In this embodiment, the elastic member 87 is composed of a coil spring.

Guide ribs 89 are formed on the second slide 80. The guide ribs 89 are formed to protrude to the outer surface of the second slide 80 like the guide ribs 79 of the first slide 71, so that the second slide 80 is guide rail 57. Is guided by). In this case, the guide ribs 89 of the second slide 80 are formed to correspond to each other with the guide ribs 79 of the first slide 71, and when the two slides 71 and 80 are combined, the two guides Ribs 79 and 89 are connected to each other.

The second mold plate 56 is provided with a stopper 90 at one end for regulating the stroke in which the slide core assembly 70 is moved. The stopper 90 is such that the slide core assembly 70 exits from the product cavity 62 when the first plate 32 and the second plate 56 are separated from each other, that is, when the mold is opened. Will be regulated.

Hereinafter will be described in detail the operation of the insert injection slide core assembly having a configuration as described above, the mold assembly having the same and the insert injection method using the same.

A process of manufacturing a product in an embodiment of the present invention will be described with reference to FIGS. 4 and 5. In insert injection, the insert 64 must first be inserted into the product cavity 62. To this end, as shown in FIG. 5, the first template 32 and the second template 56 are separated from each other.

The insert 64 is seated on the second shape core 60 such that the fixing pin 66 protruding through one of the second shape cores 60 passes through the through hole of the insert water 64. In this case, the insert 64 may not be completely seated on the second shape core 60. In this case, the first slide 71 and the second slide 80 are separated from each other.

Next, an operator moves the first slide 71 in the direction of the insert 64. More precisely, the insert 64 is formed by inserting the first slide 71 into the insert 64 while the groove 74 of the slide core 73 provided in the first slide 71 faces the insert 64. ). If it continues to move toward the insert 64, the insert 64 is inserted into the insert groove 75 in the forming groove 74.

At this time, the operator can visually check whether the insert 64 is correctly inserted into the insert groove 75, and if the insert 64 is not correctly inserted into the insert groove 75. It is possible to adjust this manually. This can be easily done because the first slide 71 is selectively movable along the guide rail 57.

In this state, the mold is closed. That is, as the distance between the first fixing plate 30 and the second fixing plate 50 approaches, the angular pin 38 enters the pin guide hole 81 of the second slide 80, and the second The slide 80 begins to move in the direction of the first slide 71 by the angular pin 38.

At this time, the hook bar 85 of the second slide 80 is hooked to the hook groove 76 of the first slide 71. That is, the hanger 85 has a front end 85a in contact with the outer surface of the first slide 71, thereby overcoming the elastic force of the elastic member 87 in a direction away from each other. When the hooking jaw 86 of the hooking bar 85 is hooked to the hooking groove 76, the hooking jaws 86 are gathered in the direction facing each other by the elastic member 87 again. It is firmly walked. (See FIG. 3).

At this time, the insert 64 is the installation position is determined by the fixing pin 66, accordingly, the first shape core 36, the second shape core 60 and the slide core 73 and the like. It can be accurately fixed in the product cavity 62 formed by. This state is the state shown in FIG. For reference, the slide core 73 is supported by the support piece 39 so as not to be pushed by the injection pressure.

In this state, when the molten synthetic resin is injected through the injection hole, the synthetic resin is supplied to the product cavity 62. The synthetic resin is solidified in the product cavity 62 and integrated with the insert 64. When the synthetic resin is solidified to some extent, the first fixing plate 30 and the second fixing plate 50 are moved relative to each other so that the first mold plate 32 and the second mold plate 56 are separated from each other. That is, open the mold.

As the first plate 32 and the second plate 56 are separated from each other, the slide core assembly 70 is retracted from the product cavity 62 by the angular pin 38, so that the insert groove 75 The insert 64, which has been inserted in, comes out. In this case, the slide core assembly 70 moves together because the first and second slides 71 and 80 are coupled to each other by the hook bar 85 and the hook groove 76.

In addition, when the first plate 32 and the second plate 56 are relatively farther away, the product cavity 62 is completely opened. In general, the product is in the second shape core 60 of the second template 56, is pushed apart by the push pin.

After the product has been taken out in this way, the operator must separate the two slides 71 and 80 again for the next operation. To this end, when the operator pushes the end 85b of the hook bar 85 into the second slide 80 while overcoming the elastic force of the elastic member 87, the tip 85a of the hook bar 85 is provided. ) Is separated from the hanger groove (76). In this state, the above-described operation is repeatedly performed while moving the first slide 71 in the direction of the new insert 64.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and various changes and modifications can be made by those skilled in the art within the scope of the claims. It is self-evident.

For example, the first slide 71 and the second slide 80 are not necessarily coupled by the hanger bar 85 and the hanger groove 76, but may be coupled by fasteners such as bolts. .

In the insert injection slide core assembly according to the present invention as described above in detail, a mold assembly having the same and an insert injection method using the same, the following effects can be obtained.

In the present invention, since the slide core assembly is composed of the first and second slides selectively coupled to each other, the operator can proceed to work in the state in which the insert is correctly inserted into the insert groove of the slide core in the open state of the mold. Therefore, the insert can be installed at the correct position when inserting the product with the undercut can minimize the occurrence of defects in the manufacturing process, there is an effect that can prevent the damage to the mold assembly.

Claims (15)

An insert groove into which an insert of the product is inserted is formed, a slide core is formed to form an undercut portion of the product, and a first slide having a guide rib formed in a longitudinal direction on an outer surface thereof; On the other side of the slide core is selectively coupled with the first slide, a pin guide hole through which the angular pin is inclined is formed, the outer surface includes a second slide formed with a guide rib connected to the guide rib of the first slide Slide core assembly for insert injection. The slide core assembly of claim 1, wherein a hook groove and a hook bar are formed at positions corresponding to each other in the first slide and the second slide. 3. The slide core assembly of claim 2, wherein the hook bar is rotatably mounted to the second slide through the fastener in a direction perpendicular to the extending direction. According to claim 2 or claim 3, wherein the front end of the hanger bar is provided to protrude out of the second slide and its end is located in the mounting groove formed in the second slide, the end of the hanger bar is mounted Slider assembly for insert injection, characterized in that the front end of the hook bar is selectively engaged with the hook groove of the first slide by rotating in the rotation space formed in the groove. The insert injection slide assembly of claim 4, wherein the mounting groove of the second slide is provided with an elastic member to provide an elastic force at a distal end of the hook bar in a direction away from the second slide. A first shape core provided in the first plate installed on the first fixing plate, A second shape core provided in a second template installed on a second fixing plate facing the first fixing plate; It is configured to include a slide core assembly which is operated by the relative movement of the first fixing plate and the second fixing plate to form an undercut portion of the product, The slide core assembly is formed with an insert groove into which an insert of a product is inserted, a first slide having a slide core forming an undercut portion of the product, and selectively coupled to the first slide at the other side of the slide core. Insert injection mold assembly, characterized in that comprising a second slide. The method of claim 6, wherein the second slide is a pin guide hole is formed to be inclined and the first fixing plate is provided with an angular pin, when the first fixing plate and the second fixing plate is closed, the second slide is guided by the angular pin Insert injection mold assembly, characterized in that the movement in the first slide direction is fastened to each other. 8. The insert assembly of claim 7, wherein the first slide and the second slide have hook grooves and hook bars formed at positions corresponding to each other, and are selectively coupled to each other. The insert assembly of claim 8, wherein the hook bar is rotatably formed in the second slide through the fastener in a direction perpendicular to the extending direction. 10. The method of claim 9, wherein the front end of the hook bar is provided to protrude outward of the second slide and the end thereof is located in the mounting groove formed in the second slide, the end of the hook bar is formed in the mounting groove The tip of the hook bar is selectively engaged with the hook groove of the first slide by rotating in the rotation space, The mounting groove of the second slide is provided with an elastic member, the mold injection assembly for insert injection, characterized in that to provide an elastic force in the direction away from the second slide at the end of the hanger bar. The insert assembly of claim 10, wherein the second die is provided with a guide rail, and the first slide and the second slide are provided with guide ribs corresponding to the guide rails. 12. The mold assembly according to any one of claims 8 to 11, wherein the second mold is provided with a stopper to limit the moving range of the slide core assembly. (A) positioning the insert to be inserted into the product with the mold open; (B) inserting the insert into the insert groove of the slide core provided in the first slide; (C) the second slide is guided by the angular pin as the mold is closed to engage with the first slide, (D) Insert injection method comprising the step of injection of the product. The method of claim 13, (E) the first slide and the second slide is guided by the angular pin and moved in a direction away from the product while the mold is opened and the product is taken out; (F) an insert injection method further comprising the step of separating the first slide and the second slide from each other. 15. The method of claim 14, wherein the steps (A) to (F) are repeated.

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