KR20090131944A - Mold assembly - Google Patents

Abstract

PURPOSE: A mold assembly is provided, which prevents abrasion or damage of a moving core or a main core by preventing interference of edges of the moving core and main core. CONSTITUTION: A mold assembly comprises a fixed plate(10), a moving plate(50), a first template(15), and a second template(75). The first and second templates are installed in the fixed plate and moving plate. A driving core(25) is fixed to the first template. An ascending and descending block(30) and a moving core(40) are installed on one side of the driving core. The ascending and descending block and moving core are moved against the fixed plate and moving plate. The moving core can be moved in the direction perpendicular to relative movement of the fixed plate and moving plate.

Description

Mold assembly

The present invention relates to a mold assembly, and more particularly, to an injection mold assembly for manufacturing a product by injecting a molten resin into the cavity.

In general, a mold assembly for injection molding is formed by taking out a product while the fixed side and the movable side move relative to each other, and the main side is provided on the fixed side and the movable side to form a cavity corresponding to the shape of the product. That is, a resin in a molten state is injected into the cavity formed by the main core, and the resin is solidified by high temperature and high pressure to be finished into a product.

1 is a cross-sectional view of a configuration of a mold assembly according to the prior art.

According to this, the stationary side plate 1 is provided on the stationary side of the molding machine, and the first side plate 2 is provided on the stationary side plate 1. In addition, the first main plate 2 is provided with a first main core 3, and the first main core 3 cooperates with the second main core 9 to be described later to correspond to the shape of the product M. It makes a space to be.

A movable side plate 4 is provided on the movable side of the molding machine. The movable side plate 4 is moved relative to the fixed side plate 1 by a driving source. The stationary side plate 1 is provided with a spacer block 6 and a tight plate 5 is provided in a space corresponding to the spacer block 6. The wheat plate (5) serves to push up the pin (E) in the direction of the product (M) while moving by a separate drive source.

The spacer block 6 is provided with a support plate 7, and the support plate 7 is provided with a second mold plate 8. The second mold plate 8 is in close contact with the first mold plate 2, and a second main core 9 corresponding to the first main core 3 is installed therein.

At this time, the undercut (M ') is formed in the product (M). The undercut M 'is formed to protrude on the bottom surface of the product M, and is protruded to some extent in a direction orthogonal to the relative moving directions of the fixed side and the movable side.

However, the prior art as described above has the following problems.

Since the undercut M 'is formed to protrude in a direction orthogonal to the relative movement direction of the fixed side and the movable side, a second main core in the process of separating the first and second template plates 2 and 8 from each other. It cannot be easily separated from (9) and is caught. Accordingly, there is a problem that the product (M) is damaged or defective occurs.

Of course, in order to solve this, a separate slide core (not shown) that moves in the direction orthogonal to the relative movement direction of the movable side plate 4 and the fixed side plate 1 on the second mold plate 8 or the support plate 7. ) Can also be installed. That is, the angular pin is inclined to the fixed side plate (1), and the slide core forms an angular hole corresponding to the angular pin so that the angular pin is inserted into or separated from the angular hole so that the slide core (4) is movable. ) And the fixed side plate 1 may be operated in a direction orthogonal to the relative movement direction.

However, since the angular pin is rod-shaped and protrudes in a cantilever shape from the fixed side plate, durability is weak compared to other parts of the mold assembly, and in particular, when the angular hole cannot be correctly inserted into the angular hole during operation of the mold assembly. High risk of breakage. In addition, since the slide core has to be moved in the product direction with an appropriate time interval according to the relative movement of the movable side plate 4 and the fixed side plate 1, there is also a problem that its design is not easy.

In addition, as shown in FIG. 1, one of the first main core 3 and the second main core 9 is further provided to protrude toward the other from the first or second template 3 and 9. In the process of being in close contact with the first plate 2 and the second plate 8 to form a cavity, there is a problem that the leading edges facing each other cause interference or wear in the process. In particular, when the leading edges of the first main core 3 or the second main core 9 are sharply formed, such wear or breakage occurs more easily.

Therefore, an object of the present invention is to solve the problems of the prior art as described above, the moving core for forming a product in the operation of the mold assembly is orthogonal to the relative movement direction of the fixed side plate and the movable side plate using an elastic member. To move in one direction.

Another object of the present invention is to prevent the leading edges facing each other in the process of forming the cores respectively installed on the fixed side and the movable side.

According to a feature of the present invention for achieving the above object, the present invention is the first mold plate is fixed to the fixed side plate of the molding machine, and is installed on the movable side plate of the molding machine is selectively in contact with the first mold plate A main core provided on one side of the second template, the first template or the second template, and having a shape corresponding to the appearance shape of the product, and provided on the other side of the first template or the second template, and An elevating block provided to be movable in the relative movement direction of the fixed side plate and the movable side plate, and provided at the front end of the elevating block to be movable in a direction orthogonal to the relative movement direction of the fixed side plate and the movable side plate to cooperate with the main core; And a cavity corresponding to the exterior shape of the product, the movable core being provided with an elastic force toward the center of the cavity by the first elastic member, And a driving core fixed to the first plate or the second plate having a lifting block installed therein to push the moving core away from the center of the cavity in the process of closely contacting the first plate and the second plate. .

First and second slopes corresponding to each other are formed on surfaces of the driving core and the mobile core that face each other.

A core case is provided on the side of the elevating block, and the locking case and the hooking jaw corresponding to each other are provided on the core case and the elevating block to restrict the movement of the elevating block.

Inside the core case, a lifting block is provided on both sides of the driving core in pairs, and a moving core is provided at the front end of the pair of lifting blocks to move in a direction closer to or farther from each other.

The driving core is formed with a guide slot extending in a direction parallel to the relative movement direction of the fixed side plate and the movable side plate, the guide core is formed through the moving core, the guide slot to pass through the guide slot and the guide channel at the same time It is provided with one end is walked on the other side of the guide slot and the other end is walked on the regulation step formed stepped in the guide channel.

The first elastic member is provided in the guide channel to provide an elastic force to the moving core in the direction of the driving core.

After the threaded portion is formed at a part of the tip of the guide tool and passes through the guide channel of the mobile core and the guide slot of the driving core, respectively, a pair is provided on the other side of the mobile core in which the guide channel is formed around the driving core. It is screwed into the moving core.

A second elastic member is provided between the movable core and the movable side plate or the fixed side plate to provide an elastic force to the movable core in the main core direction.

According to the mold assembly according to the present invention, the following effects can be expected.

In the present invention, since the movable side is moved in the direction orthogonal to the relative movement direction of the fixed side plate and the movable side plate by the elastic member on the fixed side or the movable side, even if a separate device such as a slide core is not provided, It can be molded easily. Accordingly, the structure of the mold assembly is simplified and the durability is improved.

In addition, in the present invention, since the tip width of the mobile core is kept narrow by the elastic member before the mobile core is mated with the mating main core, the leading edges facing each other in the mating process of the main core and the mobile core do not interfere. Accordingly, wear or breakage of the moving core or the main core is prevented, thereby reducing the maintenance cost of the mold assembly.

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

2 is a configuration of a preferred embodiment of the mold assembly according to the present invention is shown in cross-sectional view, Figure 3 is a perspective view of the configuration of the core assembly constituting the embodiment of the present invention, Figure 4 is an embodiment of the present invention In the core assembly constituting the core case and a part of the moving core is removed is shown in perspective view, Figure 5 is shown in a cross-sectional view of the configuration of the core assembly constituting the embodiment of the present invention.

As shown in these figures, the stationary side plate 10 is provided on the stationary side of the molding machine. Although not shown in the fixed side plate 10 is provided with a sprue device is injected molten resin through it.

The fixed side plate 10 is provided with a first mold plate 15. The first template 15 is a part in close contact with the second template 75 to be described below. At this time, although not shown, a separate support plate 70 may be provided between the first mold plate 15 and the fixed side plate 10.

The first mold 15 is provided with a core assembly 20. The core assembly 20 is combined with the main core 80 to be described below to form a cavity C corresponding to the shape of the product. The core assembly 20 refers to an assembly composed of a core case 21, a driving core 25, a lifting block 30, and a moving core 40 to be described later. Hereinafter, each part of the core assembly 20 will be described in detail.

The core case 21 is provided outside the core assembly 20. The core case 21 is installed on the first mold 15 to cover the driving core 25, the lifting block 30, and the moving core 40. Of course, the core case 21 may be omitted and the first template 15 may take its role.

The core case 21 is provided with a locking jaw 21 '. The locking jaw 21 'is formed to be stepped on one side of the core case 21, and the hooking jaw 30' of the lifting block 30 to be described below is a portion to be walked. That is, the hooking jaw 21 'is the hooking jaw (30') of the lifting block 30 on the outer surface and as a result serves to limit the movement of the lifting block (30).

The drive core 25 is provided inside the core case 21. The driving core 25 forms a part of the cavity C corresponding to the shape of the product, and one end thereof is fixed to the first mold 15 so as to be opposed to the moving core 40. While moving, it serves to move in the direction away from the driving core 25 by pressing the moving core (40).

A first slope 26 'is formed on an outer surface of the tip 26 of the driving core 25. The first inclined plane 26 ′ corresponds to the second inclined plane 44 of the mobile core 40 to be described below, and serves to move the mobile core 40 by pressing the second inclined plane 44. .

As shown in FIG. 4, a first forming groove 27 is formed at the tip of the driving core 25. The first forming groove 27 is formed by a part of the driving core 25, cooperative with the second forming groove 43 of the mobile core 40 to be described below to correspond to the appearance of the product The cavity C is formed.

Guide slots 28 are formed in the driving core 25. The guide slot 28 is formed to extend in the relative movement direction of the fixed side plate 10 and the movable side plate 50 to be described later, the guide sphere (B) to be described below to pass through. The extended length of the guide slot 28 serves to limit the moving distance of the moving core 40 and the lifting block 30 coupled thereto.

The driving core 25 is provided with a fastening jaw 29. The fastening jaw 29 is hooked on a fixing jaw (not shown) formed in the first template 15 so that the driving core 25 can be fixed to the first template 15.

Lift blocks 30 are provided on both sides of the drive core 25. The lifting block 30 is installed between the core case 21 and the driving core 25 to move in the relative movement direction of the fixed side plate 10 and the movable side plate 50. At the same time, the lifting block 30 is connected to the moving core 40 serves to move the moving core 40 substantially in the relative movement direction of the fixed side plate 10 and the movable side plate 50. In addition, the elevating block 30 is in close contact with the drive core 25 and the core case 21 so that the moving core 40 can be moved without flow.

The lifting block 30 is provided with a hanger jaw (30 '). The hooking jaw 30 'corresponds to the hooking jaw 21' of the core case 21, and hangs on the hooking jaw 21 'to limit the movement stroke of the elevating block 30. .

As shown in Figure 4, the lifting block 30 is formed with a coupling groove (32). The moving core 40 is inserted into the coupling groove 32 to allow the moving core 40 to move in a direction orthogonal to the moving direction of the lifting block 30. The coupling groove 32 is formed in a substantially T-shape as shown, the mobile core 40 is to be moved in a state in which the moving piece 42 of the mobile core 40 to be described below is engaged therein. Will be.

The moving core 40 is connected to the lifting block 30. The moving core 40 is connected to the lifting block 30 and moved together in the relative movement direction of the fixed side plate 10 and the movable side plate 50. The mobile core 40 cooperates with the driving core 25 and the main core 80 to form a cavity C corresponding to a product shape.

The moving core 40 is provided with a moving piece 42. The movable piece 42 is inserted into the engaging groove 32 of the elevating block 30 and maintained in a walked state. Accordingly, the moving core 40 may be moved in a direction orthogonal to the moving direction of the lifting block 30 while being connected to the lifting block 30. That is, the moving core 40 may be operated not only in the moving direction of the elevating block 30 but also in a direction orthogonal thereto.

As shown in FIG. 3, a second forming groove 43 is formed in the mobile core 40. The second forming groove 43 corresponds to a kind of empty space for making a cavity C in cooperation with the first forming groove 27 of the driving core 25. That is, the molten resin is injected into the second molding groove 43 to make a product.

In this case, an undercut portion 43 ′ is formed in the second molding groove 43. The undercut portion 43 'is formed by further recessing a portion of the second forming groove 43 in the direction of the driving core 25, that is, the center direction of the cavity C. Play a role.

A second slope 44 is formed on the moving core 40. The second inclined surface 44 corresponds to the first inclined surface 26 'of the driving core 25 and is a portion pressed by the first inclined surface 26' of the driving core 25.

In addition, the movable core 40 is spaced apart from the second inclined surface 44 and a seating inclined surface 45 is formed. The seating slope 45 is a first inclined plane of the driving core 25 when the lifting block 30 and the moving core 40 relatively move with the driving core 25 so that the height of the tip is the same. (26 ') is a seating part (refer FIG. 6C).

The guide channel 46 is formed to penetrate the moving core 40. The guide channel 46 is formed on any one of the moving cores 40 on both sides, and is a portion through which the guide tool B penetrates. In this embodiment, the guide channel 46 is formed in the mobile core 40 installed on the right side with reference to FIG. 5.

As shown in FIG. 5, a first step portion 47 and a second step portion 48 are formed inside the guide channel 46. The first step portion 47 is a portion where the head portion B 'of the guide tool B is hooked, and the second step portion 48 is a portion at which one end of the first elastic member S is seated. That is, one end of the first elastic member S is seated on the head portion B ′ of the guide tool B, and the other end is seated on the second step portion 48.

A fastening groove 49 is formed in the mobile core 40. The fastening groove 49 is formed in the remaining moving core 40 in which the guide channel 46 is not formed among the moving cores 40. 40). The front end of the guide sphere (B) passing through the guide channel 46 is inserted into the fastening groove 49 is fixed. To this end, the threaded grooves 49 'and B' 'corresponding to each other are formed in the fastening groove 49 and the guide tool B.

As shown in FIG. 5, the guide tool B is a guide slot 28 of the guide channel 46 and the driving core 25 with the first elastic member S inserted into the guide channel 46. After passing through), the tip is inserted into the fastening groove 49 and fixed. Accordingly, the first elastic member S provides an elastic force in a direction in which the moving cores 40 on both sides are close to each other (arrows ① and ② directions in FIG. 5), that is, in the center direction of the cavity C. FIG.

At this time, as shown in Figure 2, the movement amount of the moving core 40 is determined by the clearance (L) between the moving core 40 and the core case 21, this clearance (L) is the first inclined surface 26 'corresponds to the distance l for pushing the second inclined surface 44 to move.

Although not shown, a second elastic member is provided between the lifting block 30 and the fixed side plate 10. The second elastic member provides an elastic force to the lifting block 30 in the direction of the second plate 75 so that the lifting block 30 and the moving core 40 connected thereto protrude in the direction of the second plate 75. do.

Next, the movable side will be described. The movable side plate 50 is provided on the movable side of the molding machine, and the spacer side 52 and the support plate 70 are sequentially installed on the movable side plate 50. At this time, a space plate 55 is formed in the space P formed by the spacer block 52, the pin pin 60 is connected to the plate 55 to take out the product.

The support plate 70 is provided with a second mold plate 75. The second plate 75 is a part that is in close contact with the first plate 15, the main core 80 is installed therein. The main core 80 is combined with the core assembly 20 to form a cavity C corresponding to the product shape. The main core 80 may be provided with a separate shape core 90. The shape core 90 also forms the cavity C of the product together with the main core 80, but may be omitted in some cases and a part of the main core 80 may serve as the shape core 90. have.

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

6a to 6c sequentially show the operation of the mold assembly according to the embodiment of the present invention. According to this, first, the movable side plate 50 and the fixed side plate 10 are separated from each other so that the first mold plate 15 and the second mold plate 75 are separated. In this state, the movable side plate 50 rises in the direction of the fixed side plate 10 based on FIG. 6A.

At this time, as shown, the moving core 40 is in a state protruding toward the second die plate (75). This is because a second elastic member is provided between the elevating block 30 connected to the mobile core 40 and the fixed side plate 10 to provide an elastic force to the elevating block 30.

When the movable side plate 50 moves in the direction of the fixed side plate 10, the front end of the movable core 40 is in contact with the shape core 90 of the second mold plate 75. At this time, since the moving core 40 is in close contact with the driving core 25, the front edges of the main core 80 of the second mold plate 75 and the moving core 40 do not interfere with each other. Will not. This is because the first elastic member S provided in the moving core 40 provides elastic force in a direction closer to each other of the moving core 40 on both sides. Therefore, the moving core 40 and the main core 80 may be prevented from interfering with each other and worn or broken. This is shown in Figure 6b.

Next, when the movable side plate 50 continues to move while overcoming the elastic force of the second elastic member, the lifting block 30 and the moving core 40 move in the direction of the fixed side plate 10, and the driving core Reference numeral 25 protrudes relatively in the direction of the second mold plate 75. In this process, the first inclined surface 26 ′ of the driving core 25 pushes the second inclined surface 44 of the moving core 40 while overcoming the elastic force of the first elastic member S. Accordingly, the mobile core 40 is moved in a direction away from each other.

At the same time, the first inclined surface 26 ′ of the drive core 25 is seated on the seating inclined surface 45 of the mobile core 40, and the tip of the drive core 25 and the mobile core 40 are continuous. It is seated on the upper surface of the shape core 90 while forming a flat plane. This is shown in Figure 6c.

In this state, the first forming groove 27 of the drive core 25, the second forming groove 43 of the mobile core 40, and the main core 80 and the shape core 90 The molten resin is injected into the cavity C to be formed and cured after a predetermined time has elapsed.

When the resin is completely cured, the movable side plate 50 is again moved away from the fixed side plate 10. Accordingly, the first plate 15 and the second plate 75 are separated from each other, and the fixed side except for the lifting block 30 and the moving core 40 is separated from the second plate 75. This is because the lifting block 30 is pressed in the direction of the second die plate 75 by the second elastic member. That is, the mold assembly returns to the state of FIG. 6B.

At this time, as the driving core 25 moves away from the shape core 90, the moving core 40 pressed by the first inclined surface 26 ′ of the driving core 25 may be attached to the first elastic member S. By moving in a direction closer to each other, in the process of the undercut of the product from the undercut portion 43 'of the moving core 40 naturally comes out. That is, even if a separate slide core is not provided, since the moving core 40 is moved in the direction orthogonal to the relative movement direction of the fixed side plate 10 and the movable side plate 50 by the first elastic member S, the undercut This can be easily molded.

When the movable side plate 50 is further away from the fixed side plate 10, the hooking jaw 30 'of the lifting block 30, which has been moved, is hooked on the catching jaw 21' of the core case 21 to further move. It is impossible to move in the direction of the second mold plate 75, and the moving core 40 is maintained in the state protruding in the direction of the second mold plate 75.

Finally, the mill plate 55 and the mill pin 60 connected thereto are lifted in the direction of the fixed side plate 10 to take out the product from the cavity (C).

The scope of the present invention is not limited to the embodiments described above, but is 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.

In the present embodiment, the lifting block 30 and the mobile core 40 are formed in pairs, respectively, for example. However, the lifting block 30 and the moving core 40 are not limited thereto. May be provided. In this case, the movable core 40 is installed on one side of the drive core 25, and the tip of the guide tool B is hung on the edge of the guide slot 28 of the drive core 25. Stays in the state.

In addition, the second elastic member may be omitted. For example, when the mold assembly is installed in the direction shown in FIG. 2, the lifting block 30 and the moving core 40 may receive a force to move toward the movable side plate 50 by their own weight. The second elastic member may not be provided.

In addition, in the present embodiment, the core assembly 20 has been described as an example provided in the first plate 15, but the core assembly 20 is provided in the second plate 75 and the main core 80 And the shape core 90 may be provided in the first template (15).

1 is a cross-sectional view showing the configuration of a mold assembly according to the prior art.

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

Figure 3 is a perspective view showing the configuration of the core assembly constituting the embodiment of the present invention.

Figure 4 is a perspective view showing a state in which some of the core case and the moving core is removed from the core assembly constituting an embodiment of the present invention.

Figure 5 is a cross-sectional view showing a state in which the moving core and the guide sphere constituting an embodiment of the present invention.

6a to 6c is a state diagram showing the operation of the mold assembly according to the embodiment of the present invention sequentially.

Explanation of symbols on the main parts of the drawings

10: fixed side plate 15: first mold plate

20: core assembly 21: core case

21 ': Jaw 25: Drive core

26: first slope 27: first forming groove

28: guide slot 30: lifting block

30 ': hanger 32: coupling groove

40: moving core 42: moving flight

43: second forming groove 43 ': undercut portion

44: second slope 45: seating slope

46: guide channel 47: first step

48: second step 49: fastening groove

50: movable side plate 75: second template

80: main core 90: shape core

Claims (9)

A first mold plate fixedly installed at a fixed side plate of the molding machine, A second mold plate installed on the movable side plate of the molding machine and selectively in contact with the first mold plate; A main core provided on one side of the first plate or the second plate and formed to have a shape corresponding to the appearance of the product; A lifting block provided on the other side of the first plate or the second plate and provided to be movable in a relative movement direction of the fixed side plate and the movable side plate; In cooperation with the main core to form a cavity corresponding to the external appearance of the product, it is connected to the leading end of the elevating block is moved with the elevating block and can be moved in a direction orthogonal to the relative movement direction of the fixed side plate and the movable side plate A moving core provided with an elastic force in the center direction of the cavity by the first elastic member, And a driving core fixed to the first plate or the second plate on which the lifting block is installed to push the moving core away from the center of the cavity in the process of closely contacting the first plate and the second plate. Mold assembly. The mold according to claim 1, wherein a core case is provided on a side surface of the elevating block, and a locking jaw and a hooking jaw corresponding to each other are provided on the core case and the elevating block to restrict movement of the elevating block. Assembly. According to claim 2, The core case is provided with a lifting block in pairs on both sides of the drive core as a center, and the moving core to be movable in the direction of approaching or away from each other at the front end of the pair of lifting blocks Mold assembly, characterized in that each is provided. 4. The mold assembly of claim 3, wherein first and second inclined surfaces corresponding to each other are formed on surfaces of the driving core and the moving core facing each other. According to any one of claims 1 to 4, The movable core is formed with a forming groove constituting a cavity corresponding to the shape of the product, The forming groove is formed with an undercut portion to be concaved toward the drive core A mold assembly characterized by molding an undercut on a product. According to claim 5, The drive core is formed with a guide slot extending in a direction parallel to the relative movement direction of the fixed side plate and the movable side plate, the moving core is formed so that the guide channel is penetrated, the guide slot and the guide channel The guide assembly is provided so as to pass through at the same time one end is walked on the other side of the guide slot and the other end is a mold assembly, characterized in that the first step is formed on the stepped stepped in the guide channel. 7. The other side of the mobile core according to claim 6, wherein a thread portion is formed at a portion of the front end of the guide tool and passes through the guide channel of the mobile core and the guide slot of the driving core, respectively. Mold assembly characterized in that the screwed to the fastening groove of the mobile core provided in pairs. The method of claim 7, wherein the first step portion and the second step portion is formed in the guide channel, respectively, the head portion of the guide mechanism is hooked on the first step portion and both ends of the first elastic member are respectively the second step A mold assembly, characterized in that seated on the head and the head of the guide sphere to provide an elastic force to the moving core in the direction of the drive core. The mold assembly of claim 8, wherein a second elastic member is provided between the movable core and the movable side plate or the fixed side plate to provide elastic force to the movable core in the direction of the main core.

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