KR20090073795A - Mold assembly - Google Patents

Abstract

A mold assembly is provided to form undercuts in crossing directions easily on the same surface of a product by using a slide block which moves in the perpendicular direction to the moving direction of the slide core. A mold assembly comprises a first main core(19a) forming a part of a cavity molding a product(P), a template(19) having an angular pin(19b) installed to be inclined and mounted on a fixed part, a second template(30) having a second main core(30') forming the cavity together with the first main core and mounted on a moving part, a slide core(32) having a first molding unit(34a) cutting a first undercut(P') of the product and installed to move straight on the second template, and a slide block(38) having a second molding unit(38e) molding a second undercut(P") perpendicular to the first undercut and relatively moving in the direction crossing with the moving direction of the slide core.

Description

Mold assembly

The present invention relates to a mold assembly, and more particularly, to a mold assembly having a slide core for molding an undercut portion of a product.

In general, the mold assembly solidifies the molten resin to form a product. The cavity, which is a space having a shape corresponding to the product, is formed inside the mold assembly, and when the molten resin flows into the cavity and solidifies, the product becomes a product.

If the product has an undercut portion, the mold assembly is equipped with a slide core. The slide core moves in a direction orthogonal to the direction in which the mold is opened to serve to form the undercut portion of the product.

To move the slide core, the mold is equipped with components such as angular pins and locking blocks.

However, the mold assembly according to the prior art as described above has the following problems.

1 is a cross-sectional view of a product produced in a mold assembly. The line K-K 'of FIG. 1 illustrates a parting line in which a mold is opened after a product is produced. Looking at the composition of the product, two undercut parts are formed on one side. The first undercut P 'is a portion penetrating the product, and the second undercut P' is a portion protruding in a substantially '-' shape on one side of the product. Forming the first undercut P ' In order to form the second undercut P ″, the slide core must move in the direction of arrow B in order to form the second undercut P ″. In the case of the second undercut P ″, since the direction in which the mold is opened and the direction in which the slide core is to be moved are the same, molding may be possible without using the slide core, but a core may be formed below the second undercut P ″. If there is another configuration of the mold so that it can not be provided with a slide core should be molded.

 Therefore, each slide core should be orthogonal to each other in the direction of movement. In this case, it is not easy to provide the slide core in the mold assembly, and a plurality of slide cores must be provided. There is a problem in that the need for a lot of complicated configuration of the mold assembly, the cost for manufacturing the mold assembly increases.

An object of the present invention is to solve the problems of the prior art as described above, to provide a mold assembly having a slide core in which a portion of the slide core is inclined in a direction orthogonal to the moving direction of the slide core.

According to a feature of the present invention for achieving the above object, the present invention is provided on the fixed side, the first main core is formed to form a part of the cavity for forming the product, the angular pin is installed inclined 1 template; A second template provided on a movable side that is relatively movable with respect to the fixed side, and having a second main core together with the first main core to form the cavity; A slide core mounted on the second template so as to be linearly movable, and having a first molding part configured to mold the first undercut of the product; And a slide block provided on the slide core so as to be relatively movable in a direction orthogonal to a moving direction of the slide core, and having a second molding part for molding a second undercut formed in a direction orthogonal to the first undercut. do.

According to claim 1, wherein the appearance and the skeleton of the slide core is formed by a body, the body is provided with a first molding portion for forming a first undercut of the product, at the end of the first molded portion provided in the body And a guide block on one surface of which a guide channel is formed to be inclined with respect to the opening direction of the mold, and the slide block is installed to be movable on the guide block.

The guide block has a guide inclined surface is inclined to the surface facing the product, a pair of guide pieces formed in a 'b' shape on both ends of the guide inclined surface is provided so that the front end thereof, the guide piece and the guide The guide channel is formed between the inclined surfaces.

The slide block is formed to protrude an insertion portion inserted into the guide channel of the guide block on one surface thereof, an inclined surface is formed on one surface of the insertion portion to be inclined at the same angle as the guide inclined surface of the guide block, the insertion Both side surfaces of the part are formed to protrude guide ribs, which are hooked to the tip of the guide piece, and the second molding part is formed on a surface opposite to the surface on which the insertion part is formed.

The movement stroke L of the slide block, which is the difference between the height H of the guide block and the height J of the slide block, is designed such that the second molding part of the slide block completely escapes the second undercut of the product. .

An elastic member is provided between the slide block and the body so that the elastic force acts to move the slide block away from the body.

According to the present invention, since the slide block is provided in the slide core to move relative to the direction perpendicular to the moving direction of the slide core in a predetermined section, the undercut formed in the direction orthogonal to each other on the same surface of the product can be easily formed. In addition, a plurality of undercuts may be formed by using only one slide core, thereby simplifying the configuration of the mold assembly, thereby reducing the cost for manufacturing the mold assembly.

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

2 is a cross-sectional view showing a configuration of a preferred embodiment of the mold assembly according to the present invention, Figure 3 is a plan view and a side view showing the configuration of the guide block constituting an embodiment of the present invention, Figure 4 A plan view and a side view, respectively, of the slide block constituting the embodiment are shown.

The mold assembly 10 is installed in a molding machine (not shown) having a fixed side and a movable side relative to the fixed side.

The fixed side plate 11 is provided on the fixed side. The fixed side plate 11 has a rectangular plate shape, and one side thereof is provided with a runner stripper plate 13. The runner stripper plate 13 is a sprue bush 15 which is separated from the fixed side plate 11 in a process of opening a mold and the runner (not shown) formed by solidifying the resin remaining in the sprue bush 15 to be described later. To separate from.

The sprue bush 15 is installed on the fixed side plate 11. The sprue bush 15 communicates with the cavity 40 to be described later to perform an entrance area for introducing the resin into the cavity 40. The sprue bush 15 is installed through the fixed side plate 11 and the runner stripper plate 13 together.

A locating ring 17 is provided at a circumference of the fixed side plate 11 at which the sprue bush 15 is installed. The locating ring 17 serves to set the position so that the fixed side plate 11 is correctly seated on the fixed side.

The first template 19 is provided at one side of the runner stripper plate 13. The first template 19 is provided to be movable relative to the runner stripper plate 13. The first template 19 is provided with a first main core 19a forming a part of the cavity 40 to be described later. Although the first main core 19a is formed separately from the first template 19 in the present embodiment, the first main core 19a may be formed integrally with the first template 19.

The first template 19 is provided with an angular pin 19b to be inclined at a predetermined angle. The angular pin 19b is formed in a rod shape having a predetermined length and inserted into the through hole 34d of the slide core 32 to be described later to guide the movement of the slide core 32.

One side of the first template 19 is provided with a locking block 20. The locking block 20 moves together with the first template 19, contacts the one end of the slide core 32 to support the slide core 32 so as not to be pushed by the pressure into which the resin flows, and the slide core 32. ) To guide the movement.

Guide inclined surface 20 'is inclined on the surface of the locking block 20 in contact with the slide core (32). The guide inclined surface 20 'contacts the support inclined surface 34c of the slide core 32 to guide the movement of the slide core 32.

The movable side plate 22 is provided on the movable side of the molding machine. The movable side plate 22 has a rectangular plate shape and has a pair of spacer blocks 24 on one surface thereof. The spacer block 24 supports the support plate 28 to be described later to form a moving space 24 ′ between the spacer blocks 24. The moving space 24 ′ provides a space in which the plate 26 to be described later is moved.

A portion of the movable side plate 22 located in the moving space 24 ′ is provided with a mill plate 26. The wheat plate 26 is installed on the movable side plate 22 so as to be movable by a separate driving source, and serves to move a mill pin (not shown) for pushing out the product P.

A support plate 28 is provided on one surface of the spacer block 24, and a second template 30 is provided on one surface of the support plate 28. The second template 30 is fastened to the support plate 28 by a fastener (not shown) such as a screw and fixed to the support plate 28.

The second template 30 is provided with a second main core 30 ′ forming a part of the cavity 40. Although the second main core 30 ′ is formed separately from the second template 30 in the present embodiment, the second main core 30 ′ may be formed integrally with the second template 30.

A core pocket 30 "is formed at one side of the second template 30 in which the second main core 30 'is provided. A slide core 32 is formed at the core pocket 30". It is installed to be movable.

The slide core 32 forms a portion of the undercuts P 'and P ″ of the product P by linearly moving along the core pocket 30 ″.

The appearance and skeleton of the slide core 32 are formed by the body 34. The body 34 is formed in a rectangular parallelepiped shape having a predetermined length, and a first molding part 34a for forming the first undercut P 'is formed at one end thereof.

On one side of the portion of the body 34 in which the first molding part 34a is formed, the block installation part 34b is formed to be stepped in the longitudinal direction of the body 34. The block installation part 34b is a part in which the guide block 36 and the slide block 38 are installed.

The support inclined surface 34c is formed to be inclined at the same angle as the guide inclined surface 20 'of the locking block 20 in the body 34 in contact with the locking block 20. The support inclined surface 34c is in contact with the guide inclined surface 20 'of the locking block 20 to guide the slide core 32.

The through hole 34d is formed through the body 34. The through hole 34d is formed to be inclined at the same angle as the inclination angle of the angular pin 19b to insert the angular pin 19b. As the mold is opened, the angular pin 19b contacts the through hole 34d and the body 34 is guided and moved.

The block installation part 34b is provided with a guide block 36. The guide block 36 is fixed to the slide core 32 by a fastener S such as a screw to the block installation part 34b. The guide block 36 serves to guide the movement of the slide block 38 to a portion where the slide block 38 to be described below is movable.

As shown in FIG. 3, the guide block 36 has a hexahedron shape of which one surface is inclined. The inclined surface of the guide block 36 is a guide inclined surface 36a. The guide inclined surface 36a serves to guide the movement of the slide block 38 in contact with the relative inclined surface 38b of the slide block 38 to be described later.

As shown in FIG. 3, a pair of guide pieces 36b are provided at both edges of the guide slope 36a. The guide piece 36b is formed in a substantially '-' shape and is provided on the guide inclined surface 36a so that the ends thereof face each other. The guide ribs 38c of the slide block 38 are supported by the guide piece 36b so that the slide block 38 is movable to the guide block 36. A guide channel 36c is formed between the guide pieces 36b. The guide channel 36c is a portion into which the insertion portion 38a of the slide block 38 to be described below is inserted.

The guide block 36 is provided with a slide block 38. The slide block 38 moves along the guide inclined surface 36a of the guide block 36 and forms the second undercut P ″. The slide block 38 forms the guide by its own weight. Although it can be moved in the block 36, it may not be moved by its own weight depending on the position provided in the mold assembly 10. In this case, it is elastic between the slide block 38 and the body 34. A member (not shown) may be provided to move the slide block 38 away from the body 34.

As shown in FIG. 4, the slide block 38 is formed in a trapezoidal shape whose cross section is inclined only on one side. An insertion part 38a is formed to protrude from one surface of the slide block 38. The inserting portion 38a is a portion inserted into the guide channel 36c of the guide block 36, and the relative inclined surface 38b is inclined on one surface thereof. The relative inclined surface 38b is formed to have an inclination corresponding to the guide inclined surface 36a, and is a portion guided in contact with the guide inclined surface 36a of the guide block 36.

Guide ribs 38c are formed to protrude from both sides of the insertion portion 38a. The guide rib 38c is supported by the guide piece 36b of the guide block 36 so that the slide block 38 is not separated from the guide block 36 and guides along the guide piece 36b. It serves to guide the movement of the slide block 38.

In the guide block 36, a core portion 38d is formed on an opposite surface of the relative inclined surface 38b. The core part 38d forms a part of the cavity 40 and is formed in a shape corresponding to a part of the product P.

One surface of the guide block 36 is provided with a second molding part 38e. The second molding part 38e is formed in a shape corresponding to the second undercut P ″, and serves to mold the second undercut P ″.

Looking at the relative movement process of the body 34 and the slide block 38 for a while, as shown in Figure 2, in the closed state of the mold, the slide block 38 is the outer surface of the second main core 30 ' And the body 34 are respectively in contact with each other, and when the body 34 is moved at the same time as the mold is opened, the slide block 38 is formed until the one surface is in contact with the second template 30. Supported by the second main core 30 ′ is moved away from the body 34. That is, until the slide block 38 is in contact with the second template 30, the moving directions of the body 34 and the slide block 38 are perpendicular to each other (see FIG. 5B).

The movement stroke L of the slide block 38, which is a difference between the height H of the guide block 36 and the height J of the slide block 38, is formed in the second molding part of the slide block 38. 38e) is designed to have a length that can completely escape the second undercut P " of the product P. This means that the second forming portion 38e of the slide block 38 has the second undercut P " This is because it does not interfere with a part of the product P when it is moved together with the slide block 38 until it is completely separated from "

Reference numeral 40 is a cavity. The cavity 40 is a kind of space formed in a shape corresponding to the product (P). The cavity 40 is formed by the first and second main cores 19a and 30 ', the core portion 38d and the first and second forming portions 34a and 38e when the mold is closed. When the cavity 40 is in communication with the sprue bush 15 and the resin flows into the cavity 40 through the sprue bush 15, the cavity 40 is completely formed and the molding of the product P is completed.

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

5a and 5b is a working state diagram showing the process of taking out the product from the mold assembly according to an embodiment of the present invention.

First, the worker introduces the molten resin into the cavity 40 through the sprue bush 15. When the resin solidifies after a predetermined time and becomes the product P, the worker moves the movable side of the molding machine away from the fixed side.

When the movable side is moved, the first and second template plates 19 and 30 are moved away from each other, and the slide core 32 is guided by the angular pins 19b of the first template plate 19. Linear movement in a direction away from the product (P). When the slide core 32 is moved, the first shaping portion 34a of the slide core 32 is separated from the first undercut P 'of the product P.

Meanwhile, the slide block 38 of the slide core 32 is moved along the guide block 36 while the slide core 32 is moved and one surface thereof is supported by the second main core 30 ′. The second molding part 38e of the slide block 38 is separated from the second undercut P ″ of the product P by moving in a direction perpendicular to the moving direction of the slide core 32. The slide block 38 is moved in a direction orthogonal to the moving direction of the slide core 32 until one surface thereof is in contact with the second template 30. Such a state is shown in Fig. 5A.

In this state, as the mold is further opened, the slide core 32 is further moved away from the product P, and the slide block 38 moves together with the slide core 32 in the direction of movement of the slide core 32. Is moved to.

When the mold is completely opened, the worker moves the plate 26 and the pin (not shown) connected to the plate 26 pushes the product (P) to take out the product (P).

As such, the body 34 of the slide core 32 for forming the first undercut P 'and the slide block 38 for forming the second undercut P ″ are moved relative to each other so that each undercut P', P "), it is not necessary to include a plurality of slide cores 32 to form a plurality of undercuts, thereby simplifying the configuration of the mold, and the body 34 and the slide block 38 of the slide cores 32. Since the moving direction of the is moved so as to be orthogonal to each other in a predetermined section, even if the forming direction of the first undercut (P ') and the second undercut (P ") is orthogonal to each other can be easily manufactured.

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.

1 is a cross-sectional view of the product produced in the mold assembly.

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

Figure 3 is a plan view and side view showing the configuration of the guide block constituting an embodiment of the present invention.

Figure 4 is a plan view and a side view showing the configuration of the slide block constituting an embodiment of the present invention.

5a and 5b is a working state showing the process of taking out the product in the mold assembly according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: mold assembly 11: fixed side plate

13: runner stripper plate 15: sprue bush

17: locating ring 19: first template

19a: 1st main core 19b: angular pin

20: locking block 20 ': guide slope

22: movable side plate 24: spacer block

24 ': moving space 26: plate

28: support plate 30: second template

30 ': 2nd main core 30 ": Core pocket

32: slide core 34: body

34a: first molded part 34b: block mounting part

34c: support slope 34d: through hole

36: guide block 36a: guide slope

36b: guide section 36c: guide channel

38: slide block 38a: insertion unit

38b: Relative slope 38c: Guide rib

38d: core portion 38e: second molding portion

40: Cavity P: Products

 P ': 1st undercut P ": 2nd undercut

 S: Fastener

Claims (6)

A first main plate installed at the fixed side and having a first main core forming a part of a cavity for forming a product, and having an angular pin installed at an angle; A second template provided on a movable side that is relatively movable with respect to the fixed side, and having a second main core together with the first main core to form the cavity; A slide core mounted on the second template so as to be linearly movable, and having a first molding part configured to mold the first undercut of the product; And a slide block provided on the slide core so as to be relatively movable in a direction orthogonal to a moving direction of the slide core, and having a second molding part for molding a second undercut formed in a direction orthogonal to the first undercut. Mold assembly. According to claim 1, wherein the appearance and the skeleton of the slide core is formed by a body, the body is provided with a first molding portion for forming a first undercut of the product, at the end of the first molded portion provided in the body And a guide block on one surface of which a guide channel is formed to be inclined with respect to the opening direction of the mold, and the slide block is installed to be movable on the guide block. According to claim 2, The guide block has a guide inclined surface is formed to be inclined to the surface facing the product, a pair of guide pieces formed in the 'b' shape on both ends of the guide inclined surface is provided so that the front end, Mold assembly, characterized in that the guide channel is formed between the guide piece and the guide slope. The inclined surface of claim 3, wherein the slide block is formed to protrude an insertion portion inserted into the guide channel of the guide block on one surface thereof, and one surface of the slide block is inclined at the same angle as the guide inclined surface of the guide block. Is formed, the both sides of the insertion portion is formed to protrude the guide ribs to the front end of the guide piece, the mold assembly, characterized in that the second molding portion is formed on the opposite side of the surface formed with the insertion portion. The moving stroke L of the slide block, which is a difference between the height H of the guide block and the height J of the slide block, wherein the second forming part of the slide block is formed at the second undercut of the product. Mold assembly characterized in that it is designed to completely escape. The mold assembly according to any one of claims 1 to 5, wherein an elastic member is provided between the slide block and the body so that an elastic force acts to move the slide block away from the body.

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