KR100814928B1 - Mold Assembly - Google Patents

Abstract

The present invention relates to a mold assembly. The present invention includes a first stationary plate mounted on one side of a molding machine and having a first disc, a first main core provided on the first disc to form a part of a product, and a second disc mounted on the other side of the molding machine. A second fixing plate having a second main plate installed at a position corresponding to the first main core on the second disc to form a shape of a product, and movable between the second fixing plate and the second disc. A second eject plate having an eject pin installed thereon, the first eject plate being movably installed between the second fixing plate and the second eject plate, and installed on the first eject plate. A hook core which penetrates through the eject plate and whose tip is formed through the second disc and the second main core to include an undercut portion of the product; and the first main core and the second main core are opened. Initially comprises a plate interlocking mechanism for allowing the first and second eject plate to be operated together and the second eject plate to be operated separately from the first eject plate at the end.

Mould, forming, hook, elastic, eject pin

Description

Die assembly

1 is a cross-sectional view showing the shape of a product with a hook.

Figure 2 is a schematic cross-sectional view showing the configuration of a preferred embodiment of a mold assembly according to the present invention.

Figure 3 is a cross-sectional view showing the front end configuration of the hook core constituting an embodiment of the present invention.

4a to 4c is a front view, a side view and a plan view showing the configuration of the release cam of the plate interlocking mechanism constituting an embodiment of the present invention.

Figures 5a and 5b is a front view and a plan view showing the configuration of the hook cam of the plate interlocking mechanism constituting an embodiment of the present invention.

Figures 6a and 6b is a front view and a plan view showing the configuration of the hook block of the plate interlocking mechanism constituting an embodiment of the present invention.

7 is an operating state diagram showing a process of opening the first and second main core in the embodiment of the present invention.

Figure 8 is an operational state showing the hook core is separated from the hook of the product in the embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1: product 3: body

5: hook 6: hanging jaw

7: undercut surface 10: 1st fixed plate

12: locating ring 14: injection hole

16: First disc 18: First main core

20: second fixing plate 22: spacer block

22 ': hanger step 23: support plate

24: Second Disc 26: Second Main Core

28: moving space 30: the first support eject plate

30 ': first hanger eject plate 32: second support eject plate

32 ': second hanger eject plate 34: ejector pin

36: hook core 38: hook inner portion

40: engaging jaw forming part 42: undercut forming part

45: plate interlock mechanism 47: release cam

48: fixed part 50: interlocking part

52: insertion slot 54: release guide surface

56: hanger cam 58: fixed hanger

60: linkage 62: hook end

64: interlocking slope 66: hanger block

68: hanger 70: interlocking slope

72: hanger flange 74: seating groove

76: elastic member

The present invention relates to a mold assembly, and more particularly, to a mold assembly for forming a product having a hook of a product that is injection molded into a synthetic resin.

1 is a cross-sectional view showing the shape of a product with a hook. According to this, the body 3 occupies most of the injection molded product 1. The shape of the body 3 is not limited to that shown, but may be various.

Hook 5 is formed on one side of the body (3). The hook (5) is to be elastically deformed to be hooked on the engaging jaw or groove formed in the other product coupled to the product (1). A locking jaw 6 is formed at the tip of the hook 5 to protrude toward the body 3. Reference numeral 7 is an undercut surface formed in the hook (5).

In general, to make a product through injection molding, first and second main cores (not shown) configured to be coupled to and separated from each other in one direction are used. The first and second main cores are formed with recesses corresponding to the shape of the product 1 to form a cavity in which resin is filled to form the product 1 by combining with each other. However, if there is a part such as the undercut surface 7 of the hook 5, a separate slide core (not shown), etc. should be used in addition to the first and second main cores.

However, when the slide core or the like is used as described above, a problem arises in that the number of parts constituting the mold assembly increases, and the product 1 and the slide are appropriately adapted to the first and second main cores being coupled and separated from each other. The problem arises that the configuration becomes more complicated so that the core can be separated.

In particular, in the case of the product 1 having the same configuration as the hook 5, the body 3 or the hook of the product 1 in order to more easily separate the slide core forming the hook 5 from the product 1. Part of 5) will be designed to be relatively thinner. However, this causes a problem that the elasticity of the hook 5 is not properly exhibited.

Accordingly, it is an object of the present invention to solve the problems of the prior art as described above, so that a product having a part such as a hook for generating an undercut can be produced as a mold assembly having a simple configuration.

Another object of the present invention to provide a mold assembly using the elasticity of the hook provided in the product to be produced.

According to a feature of the present invention for achieving the above object, the present invention is mounted on one side of the molding machine and provided with a first disc and a first disc, and provided in the first disc to form a part of the shape of the product A first main core, a second fixing plate mounted on the other side of the molding machine and having a second disc, and a second disc installed at a position corresponding to the first main core on the second disc to form a part of a product A second eject plate comprising a main core, an eject pin movably installed between the second fixing plate and the second disc, and ejecting a product; and a movable part installed between the second fixing plate and the second eject plate. A first eject plate formed on the first eject plate and penetrating through the second eject plate and having an undercut portion of the product through the second disc and the second main core; The hook core and the first main core and the second main core are initially opened and the first and second eject plates are operated together, and at the end, the second eject plate is separately operated so as to move away from the first eject plate. And a plate interlocking mechanism, wherein the plate interlocking mechanism is provided with a fixing portion fixed to the second fixing plate and provided with a release guide surface extending from the fixing portion, and the first and second eject plate. A release cam installed through the second cam plate, a hook cam installed on the second eject plate and positioned in parallel with an interlocking part of the release cam, and a hook end and an interlocking slope formed on the interlocking part, and on the first eject plate. Supported by an elastic member and selectively hooked to the hook cam and by the release guide surface of the release cam The engagement state of the hook yikaem to be released is configured to include a hook block provided with a projection and interlock slope.

The space in which the first and second eject plate are moved is formed by installing a spacer block between the second fixing plate and the second disc.

A support plate is further provided between the spacer block and the second disc.

The spacer block has a hook step for regulating the movement range of the first eject plate.

Each of the first and second eject plate is formed by overlapping a support eject plate and a hang eject plate.

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Two interlocking portions of the release cam are extended side by side at a predetermined interval so that an insertion slot into which the interlocking portion of the hook cam is inserted is formed.

The hook blocks are installed one each in a direction perpendicular to both ends of the release cam and the hook cam.

According to the mold assembly according to the present invention having such a configuration, it is possible to produce a synthetic resin product having a hook having an undercut toward the main body of the product with a simpler structure, and in particular, by using the elasticity of the hook to take out the product. This means that even when the actual product is used, it can have sufficient elasticity, which has the advantage of increasing the operation reliability of the hook.

Hereinafter, a preferred embodiment of the mold assembly according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic cross-sectional view showing the configuration of a preferred embodiment of the mold assembly according to the present invention, Figure 3 is a front end configuration of the hook core constituting an embodiment of the present invention is shown in cross-sectional view, Figures 4a to 4c The configuration of the release cam constituting the embodiment of the present invention is shown in a front view, a side view and a plan view, and the configuration of the hanger cam constituting the embodiment of the present invention is shown in a front view and a plan view in FIGS. 5A and 5B, 6A and 6B show a front view and a plan view of the structure of the hanger block constituting the embodiment of the present invention.

As shown in these figures, the first fixing plate 10 is a part mounted on one side of the molding machine. The first fixing plate 10 is generally mounted on the stationary side of the molding machine. The first fixing plate 10 is provided with a locating ring 12 for connection to the fixed side of the molding machine, the injection hole 14 is provided at a position passing through the center of the locating ring 12. The injection hole 14 is a portion in which the resin for molding the product 1 is injected.

The first fixing plate 10 is provided with a first disc 16. The first disc 16 is fixed to the first fixing plate 10 using a bolt or the like. The first disc 16 is formed such that the first core installation space 17 is recessed. The first main core 18 is installed in the first core installation space 17. The first main core 18 is provided with a shape corresponding to the shape of the product 1 on a surface facing the second main core 26 to be described below. The first main core 18 may be composed of a plurality of pieces.

The second fixing plate 20 is a part mounted on one side of the molding machine. The second fixing plate 20 is generally mounted on the movable side of the molding machine. Spacer blocks 22 are installed at both ends of the second fixing plate 20. Hook steps 22 'are formed at portions of the space blocks 22 facing each other. The hook step 22 'is a portion for the operation of the plate interlocking mechanism 45 to be described below.

A supporting plate 23 is installed on the spacer block 22 so as to face the second fixing plate 20. The second disc 24 is installed on the support plate 23. The second disc 24 is installed on the second fixing plate 20 to face the first disc 16. Of course, in some cases, the second disc 24 may be installed on the spacer block 22 without the support plate 23.

A second core installation space 25 is formed in the second disc 24, and a second main core 26 corresponding to the first main core 18 is installed in the second core installation space 25. do. The second main core 26 is also provided with a shape corresponding to that of the product 1. That is, a shape corresponding to the shape of the product 1 is formed on a surface of the second main core 26 facing the first main core 18. In fact, the product 1 is formed in the cavity 26 'which is a space formed by the first main core 18 and the second main core 26. That is, the shape of the cavity 26 'is the shape of the product 1.

Of course, the shape of the cavity 26 ′ is not only formed by the first main core 18 and the second main core 26 but also partially formed by the hook core 36 to be described below. However, most of the configuration of the body 3 is formed by the first main core 18 and the second main core 26. Resin injected through the injection hole 14 is supplied to the cavity 26 ′.

A moving space 28 is formed between the second fixing plate 20 and the supporting plate 23 by the spacer block 22. Eject plate 30, 30 ′, 32, 32 ′ are movably installed in the moving space 28.

First, the first support eject plate 30 is installed to be in contact with the second fixing plate 20, and the first support eject plate 30 is coupled to the first support eject plate 30 by a bolt (not shown) to move integrally. A hanger eject plate 30 ′ is installed on the first support eject plate 30. The first support eject plate 30 and the first hang eject plate 30 ′ are for fixing the hook core 36 to be described below.

Apart from the first support and hanger eject plates 30 and 30 ', second support and hanger eject plates 32 and 32' are installed to face the first hanger eject plate 30 '. The second support and the hanger eject plates 32 and 32 'are coupled to each other by bolts or the like. The second support and hanger eject plates 32 and 32 'are for installing eject pins 34 to be described below. The eject plates 30, 30 ′, 32, 32 ′ are movable in the moving space 28. In addition, the configuration for the movement of the eject plate (30, 30 ') (32, 32') is omitted for convenience of description.

An eject pin 34 is installed to penetrate the second hanger eject plate 32 ′ and be supported by the second eject plate 30. The eject pin 34 penetrates through the support plate 23, the second disc 24, and the second main core 26 so that a tip thereof is in the cavity 26 ′. In fact, the tip of the eject pin 34 forms part of the inner surface of the cavity 26 '. The eject pin 34 serves to push the product 1 to be separated from the second main core 26 after the product 1 is molded.

Hook cores 36 are installed on the first support and hanger eject plates 30 and 30 ', and the hook cores 36 pass through the second support and hanger eject plates 32 and 32'. In addition, the hook core 36 also penetrates through the base plate 23, the second disc 24, and the second main core 26 so that the tip thereof is in the cavity 26 ′. In fact, the tip of the hook core 36 forms part of the inner surface of the cavity 26 '. That is, it serves to form the hook 5 of the product (1).

At the tip of the hook core 36, the hook inner surface forming portion 38 is provided as shown in FIG. The hook inner surface forming portion 38 forms a surface of the hook 5 facing the body 3. It is connected to the hook inner surface forming portion 38 is formed by the locking step forming portion 40 concave. The locking jaw forming portion 40 forms the locking jaw 7 of the hook (5). The ceiling surface of the locking step forming portion 40 is an undercut forming portion 42 forming the undercut surface 7 of the hook 5.

Next, the configuration of the plate interlocking mechanism 45 for controlling the first and second eject plate 30, 30 ', 32, 32' to move together, will be described. The plate interlocking mechanism 45 controls the first and second eject plate 30, 30 ′, 32, 32 ′ to move together or to move only the second eject plate 32, 32 ′.

To this end, first, the release cam 47 is installed on the second fixing plate 20. The release cam 47 is installed on the second fixing plate 20 so as to protrude toward the eject plates 30 and 30 'and 32 and 32', and the eject plate 30 and 30 in a state where the mold is actually closed. Penetrates through ') (32,32').

The release cam 47 is provided with a fixing portion 48 fixed to the second fixing plate 20. The fixing part 48 is formed to have a relatively wider area than other parts. The interlocking portion 50 is provided to protrude vertically from the fixing portion 48. The linkage portion 50 is formed in two substantially opposite to each other in the shape of a rectangular pillar, making an insertion slot 52 therebetween. The interlocking portion 50 is formed to have a relatively wider width than the base portion at which the front end portion is connected to the fixing portion 48. The release guide surface 54 is formed to be inclined at the interlocking portion 50. The release guide surface 54 is formed on both sides of the outer surface of the interlocking portion 50.

The hook cam 56 is fixed to the second eject plate 32 and 32 ′, and the hook cam 56 is inserted into the insertion slot 52 of the release cam 47. The hook cam 56 has a fixing hook portion 58 for fixing to the second eject plate (32, 32 '). The fixed hook portion 58 is located between the second eject plate 32, 32 'is hooked. A predetermined space is formed in the second eject plate 32 and 32 ′ to allow the fixing hanger 58 to hang.

The hook cam 56 is provided with an interlocking portion 60 to stand upright from the fixed hook portion 58. The linkage part 60 is inserted into the insertion slot 52 of the release cam 47. The interlocking portion 60 has a substantially rectangular pillar shape and is inserted into the insertion slot 52 with almost no gap.

Hook end 62 is formed at the front end of the interlocking portion 60 to protrude to both ends thereof. The hook end 62 is a part selectively hooked with the hook block 66 to be described below. Interlocking slopes 64 are formed on both ends of the interlocking portion 60 so as to be paired with the hooking end 62, respectively. The interlocking slope 64 is a portion for guiding the hook block 66 to be hooked to the hook end 62.

Hanger block 66 is installed on the first eject plate (30, 30 ') is selectively interlocked with the release cam 47 and the hanger cam (56). The first and second eject plate 30, 30 ′, 32, 32 ′ are integrally moved when the hook block 66 is engaged with the hook end 62 of the hook cam 56. When the hook block 66 is separated from the hook cam 56 by the release cam 47, the first eject plates 30 and 30 ′ and the second eject plates 32 and 32 ′ move separately. Can be.

The hook block 66 is installed at positions corresponding to both ends of the release cam 47 and the hook cam 56 in a direction orthogonal to the installation directions of the release cam 47 and the hook cam 56. That is, the hanger block 66 is installed in the block space 31 formed in the first eject plate 30 and 30 '. The hanger block 66 has a substantially hexahedral shape, and the hanger 68 is disposed at the front end thereof. And an interlocking slope 70 that guides the hanger cam 56 to the hanger end 62 at the tip where the hanger 68 is formed, and interlocks with the release slope 54 of the release cam 47. Is formed.

A hanger flange 72 is formed at the rear end of the hanger block 66 to prevent the hanger block 66 from falling out of the block space 31 toward the space where the release cam 47 is installed. A seating groove 74 is formed in the hook flange 72 so as to be opened to a rear end thereof (an opposite end formed with the hook jaw 68 and the interlocking slope 70). One end of the elastic member 76 installed in the block space 31 is seated in the seating groove 74. Here, the elastic member 76 provides a force to move the hook block 66 in the direction of the release cam 47 or the hook cam 56.

Hereinafter, the operation of the mold assembly according to the present invention having the configuration as described above in detail.

First, the state of FIG. 2 is a state in which the first main core 18, the second main core 26, and the hook core 36 form a cavity 26 ′ for forming the product 1. Of course, the eject pin 34 also forms part of the cavity 26 '. In this way, the state in which the first main core 18 and the second main core 26 are in close contact with each other is called a closed state, and the state in which the first main core 18 and the second main core 26 are separated is opened. It is called state.

In the above state, the molten resin is injected into the cavity 26 ′ through the injection hole 14. When the resin injected into the cavity 26 'is cured, the movable side of the molding machine is moved to separate the first main core 18 and the second main core 26.

That is, first, the second fixing plate 20 moves in a direction away from the first fixing plate 10 so that the first main core 18 and the second main core 26 are separated. In this case, the product 1 formed in the cavity 26 ′ is in the second main core 26. Therefore, the outer surface of the product 1 formed by the first main core 18 is exposed to the outside.

Next, the first and second eject plate 30, 30 ′, 32, 32 ′ are operated. Of course, the operation of the second fixing plate 20 and the operation of the first and second eject plate 30, 30 ′, 32, 32 ′ may occur together. Here, the first and second eject plate (30,30 ') (32,32') is the hanger 68 of the hanger block 66 is installed on the first eject plate (30, 30 ') 2 is operated together by being hooked on the hook end 62 of the hook cam 56 provided on the eject plate 32, 32 '. This is the case in the process from FIG. 2 to FIG. 7.

That is, the first and second eject plate (30, 30 ') (32, 32') is the first eject plate (30, 30 '), more precisely the first hanger eject plate (30') is the hook They move together until they walk on the car 22 '. Once the first hanger eject plate 30 'is hooked to the hanger step 22', as shown in FIG. 7, the first eject plate 30 and 30 'are fixed and the second eject plate ( 32, 32 ') continue to move.

At this time, since the release cam 47 is fixed to the second fixing plate 20, in the state of FIG. 7, the interlocking slope 70 of the hook block 66 is connected to the release guide surface 54 of the release cam 47. ) Will begin to be guided. As such, when the interlocking slope 70 of the hook block 66 is guided to the release guide surface 54, the hook block 66 retreats in the block space 31 while overcoming the elastic force of the elastic member 76. do.

In this case, the hanger jaw 68 of the hanger block 66 exits from the hanger end 62 of the hanger cam 56. Therefore, the coupling between the hanger cam 56 and the hanger block 66 is released so that the second eject plates 32 and 32 'can be moved separately from the first eject plate 30 and 30'. . This state of movement is shown in FIG. 8.

Meanwhile, since the first and second eject plate 30, 30 ′, 32, 32 ′ move together until the state of FIG. 7, the hook core 36 and the eject pin 34 move together, respectively. This protrudes from the second main core 26. In this case, the hook core 36 is attached to the inner surface of the hook 5 of the product 1 as it is.

Next, in the state of FIG. 7, only the second eject plate 32 and 32 ′ relatively move further in the direction of the second disc 24 so that the eject pin 34 is more than the hook core 36. To protrude. That is, the hook core 36 is not moved because the first eject plates 30 and 30 'are no longer moved, and only the eject pin 34 is moved by the second eject plates 32 and 32'. .

As such, the hook core 36 is fixed and the eject pin 34 is further protruded so that the hook 5 of the product 1 can be separated from the hook core 36. At this time, the hook 5 is easily restrained since there is no restrained part except that the locking jaw 6 is inserted into the locking jaw forming part 40 of the portion coupled with the hook core 36. Do. When the hook 5 is elastically deformed and separated from the hook core 36, the hook 5 is in a state as shown in FIG. 8. That is, the product 1 is taken out.

Next, as shown in FIG. 8, the first main core 18 and the second main core 26 are completely opened, and thus the state of FIG. When the state of FIG. 8 becomes the state of FIG. 2, the second eject plates 32 and 32 ′ are moved to contact the first eject plates 30 and 30 ′.

At this time, the hook cam 56 installed in the second eject plate 32 and 32 ′ enters the insertion slot 52 of the release cam 47. As the hook cam 56 enters the insertion slot 52 of the release cam 47, the interlocking slope 64 is guided to the interlocking slope 70 of the hook block 66. In this case, as the hook block 66 is retracted, the hook cam 56 enters into the insertion slot 52. In addition, this process is performed while the first eject plate 30 and 30 'are also moved.

That is, since the release cam 47 is fixed to the second fixing plate 20, the first and second eject plate 30, 30 ′, 32, 32 ′ are directed toward the second fixing plate 20. When moved, the release cam 47 moves relative to the first and second eject plate 30, 30 ′, 32, 32 ′. That is, the tip is exposed through the second eject plate 32 and 32 'as shown in FIG. 2 through the first and second eject plate 30 and 30' and 32 and 32 '.

In this process, the tip of the hook block 66 is guided to a relatively narrow portion of the interlocking portion 50 of the release cam 47 and the hook end 62 of the tip of the hook cam 56. On the hanger 68 is hanged. Such a state became the state which produced the next product 1 in the state of FIG. Thereafter, the operation as described above is repeatedly performed.

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

For example, the interlocking part 50 of the release cam 47 may be installed in parallel with the interlocking part 60 of the hanger cam 56 so as to be interlocked with the hanger block 66, and necessarily two interlocking parts. The section 60 does not need to be provided.

In the mold assembly according to the present invention as described in detail above, the following effects can be obtained.

First, the present invention does not use a separate slide core or the like moving in a different direction from the first and second main core while producing a product having an undercut. Therefore, the number of parts constituting the mold assembly is relatively reduced, and the operation of the parts constituting the mold assembly is also simplified. Therefore, the productivity of the product with an undercut can be significantly increased.

Particularly, in the present invention, the hook formed on the product may be elastically deformable, so that the hook-shaped product may be formed without using a separate slide core that moves in a different direction from the first and second main cores. It was. In this way, since the elastic deformation of the hook is used to take out the product, the hook can exert sufficient elastic deformation force even in the actual use of the hook, and thus the effect of increasing the operation reliability of the product can be expected.

Claims (8)

A first fixing plate mounted on one side of the molding machine and having a first disc, A first main core provided on the first disc to constitute a part of the shape of the product; A second fixing plate mounted on the other side of the molding machine and having a second disc; A second main core installed at a position corresponding to the first main core on the second disc to form a shape of a product; A second eject plate disposed between the second fixing plate and the second disc and having an eject pin for taking out a product; A first eject plate disposed movably between the second fixing plate and the second eject plate; A hook core installed on the first eject plate, the hook core penetrating through the second eject plate and having a front end passing through the second disc and the second main core to include an undercut portion of the product; And a plate interlocking mechanism for allowing the first and second eject plates to be operated together at the beginning of opening the first main core and the second main core and separately operating the second eject plate to be separated from the first eject plate. Configured by The plate interlock mechanism, A release cam fixed to the second fixing plate and provided with a release guide surface interlocked with the interlocking portion extending from the fixed portion and installed through the first and second eject plate; A hook cam installed on the second eject plate and positioned in parallel with an interlocking part of the release cam, and having a hook end and an interlocking slope formed on the interlocking part; A hook block supported by the elastic member on the first eject plate and selectively hooked on the hook cam, the hook block having a hook jaw and an interlocking slope so as to be released from the hook cam by a release guide surface of the release cam; Mold assembly, characterized in that configured by. The mold assembly of claim 1, wherein a space in which the first and second ejection plates move is formed by installing a spacer block between the second fixing plate and the second disc. The mold assembly of claim 2, further comprising a support plate between the spacer block and the second disc. 4. The mold assembly of claim 3, wherein a hook step is provided on the spacer block to regulate a moving range of the first eject plate. The mold assembly of claim 4, wherein the first and second eject plate are formed by overlapping a support eject plate and a hang eject plate, respectively. delete The mold assembly according to any one of claims 1 to 5, wherein the two interlocking parts of the release cam extend side by side at a predetermined interval so that an insertion slot into which the interlocking parts of the hanger cams are inserted is formed therebetween. . 8. The mold assembly of claim 7, wherein the hook blocks are installed one by one in a direction orthogonal to both ends of the release cam and the hook cam.

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