KR101646972B1 - Mold for injection compression molding thin plate - Google Patents

Abstract

The present invention provides an injection compression mold for sheet metal forming that prevents wear of the moving block and has a uniform gap with the fixed block. The injection compression mold for sheet metal forming according to the present invention comprises a first mold block having a sprue and a runner formed therein so as to supply a molding material and a second mold block opposed to the first mold block, And a second mold block for forming a gate. The second mold block includes a fixed core block, a moving core block inserted into the fixed core block and ascending and descending, and protruding from the side surface of the fixed core block, wherein the moving core block is rotated And a rotary jig.

Description

[0001] MOLD FOR INJECTION COMPRESSION MOLDING THIN PLATE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection compression mold, and more particularly, to an injection compression mold capable of ultra-thin plate injection.

In general, an injection mold refers to a process in which a melt is injected into a cavity formed by mutually combining a pair of molds, and a product is taken out through a series of processes when the melt filled in the cavity coagulates. Here, the coagulated article is taken out through a take-out means such as a mil-fin which separates the article from the cavity by pressurizing the article.

On the other hand, in recent years, with the spread of ultra-thin electronic products, there has been an increasing demand for ultra-thin electronic products for manufacturing ultra-thin electronic products.

However, as a general injection molding method, in the case of a thin sheet molding in which a thin optical sheet having a fine optical pattern is present on a surface thereof, a high-temperature flow resin injected into a cavity contacts a mold wall having a relatively low temperature And solidified from the surface to form a surface solidified layer.

The surface hardening layer thus formed lowers the flowability of the flow resin and lowers the moldability and generates excessive pressure in the gate portion to be injected, causing irregular thickness of the product and deformation of the product due to the pressure deviation, Resulting in degradation.

In order to solve this problem, an injection compression mold for changing the volume of the cavity can be applied. Compared with the high-speed injection mold, the injection-compression mold has improved moldability and residual stress.

The injection-compression mold includes a core block and an insert core inserted into the core block so as to change the volume of the cavity. The injection-compression mold has a shape such as a burr in a sliding section between the insert core and the core block. There is a problem that the core is damaged due to the friction between the core block and the insert core in the sliding section, thereby causing a problem of product failure.

Korean Patent Laid-Open No. 10-2011-0108915 Korean Patent Laid-Open No. 10-2002-0082406

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide an injection compression mold for sheet metal forming having a structure in which the frictional force between the core block and the insert core is reduced during sheet metal forming, The purpose.

According to an aspect of the present invention, there is provided an injection compression mold for sheet metal forming according to the present invention, including: a first mold block having a sprue and a runner formed therein to supply a molding material; and a second mold block opposed to the first mold block, And a second mold block for forming a cavity and a gate between the mold and the block. The second mold block includes a fixed core block, a moving core block inserted into the fixed core block and ascending and descending, and protruding from the side surface of the fixed core block, wherein the moving core block is rotated And a rotary jig.

And a plurality of jig receiving grooves into which the rotary jig part is rotatably inserted and inserted, wherein the contact block receiving groove is formed in the side surface of the stationary core block, .

In this case, the rotary jig may be in a ball shape.

Alternatively, the rotary jigs may be arranged laterally and vertically in the form of rollers extending in the lateral direction.

In this case, the clearance between the contact block coupled to the fixed core block and the moving core block may be 0.05 mm to 0.2 mm.

According to the present invention having such a constitution as described above, by inserting the rotary jig into the core block, the gap between the core block and the insert core is uniformly maintained, the intervals between the sliding sections become uniform, do.

1 is a schematic view showing an injection compression mold for sheet metal forming according to a preferred embodiment of the present invention.
Fig. 2 is a cross-sectional view of the mold of the injection compression mold for sheet metal forming in Fig. 1; Fig.
3 is an enlarged cross-sectional view of a portion where the moving core block and the fixed core block are in contact with each other in Fig.
FIG. 4 is a front view showing a face where the contact block is inserted into the fixed core block in FIG. 3 from the front; FIG.
5 is a front view showing a modification of Fig.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a schematic view showing an injection compression mold 100 for sheet metal forming according to a first preferred embodiment of the present invention. Fig. 2 is a cross-sectional view of a mold of injection compression mold 100 for sheet metal forming to be.

1 and 2, an injection compression mold 100 for sheet metal forming according to a preferred embodiment of the present invention includes a first mold block 110 and a second mold block 120. As shown in FIG.

The first mold block 110 is formed with a runner 114 for supplying a molding material. A sprue 112 may be directly formed on the first mold block 110 or may be formed on a separate mold block stacked with the first mold block 110.

The first mold block 110 is connected to the injection apparatus to move the molding material supplied from the injection apparatus through the sprue 112 and the runner 114.

The second mold block 120 is opposed to the first mold block 110 to form a cavity and a gate between the first mold block 110 and the first mold block 110 when the mold is closed.

The second mold block includes a fixed core block 121, a moving core block 131, and a rotating jig 181.

The fixed core block 121 and the moving core block 131 are arranged adjacent to each other and arranged to rise and fall relatively.

In this case, the fixed core block 121 is fixed to form a gate together with the first mold block 110, and the moving core block 131 is inserted into the fixed core block 121.

The rotating jig 181 is arranged to contact the moving core block 131 and rotates when the moving core block 131 ascends and descends. The rotation jig 181 is inserted into the fixed core block 121 to maintain a constant gap between the moving core block 131 and the fixed core block 121. In addition, the rotating jig 181 can reduce the frictional force when the moving core block 131 ascends and descends so as to enhance the durability of the moving core block 131 and to make the intervals uniform, thereby reducing the occurrence of defects. The rotary jig 181 may be a steel ball made of stainless steel, chrome steel, carbon steel, ceramics or the like.

The rotary jig may be inserted into the first fixing block 121 directly. In this case, the first fixing block 121 may be formed with a receiving groove for the rotating jig so that the rotating jig 181 is inserted.

Alternatively, as shown in FIG. 3, the rotary jig 181 may be inserted into the contact block 171. The contact block 171 may be received in the contact block receiving groove 127 formed in the side surface of the fixed core block 121. The contact block 171 may be formed with a receiving groove 178 for the rotary jig to insert the rotary jig 181 therein.

The contact block 171 may be made of a material having a hardness lower than that of the moving core block 131 so as to improve workability in forming the receiving groove 178 for the rotary jig.

The position where the contact block 171 is formed is at a position where the moving core block 131 is sliding, and does not invade at least the surface of the cavity. In this case, when the contact block 171 is mounted on the fixed core block 121, the side surface of the contact block 171 and the side surface of the fixed core block 121 are preferably located at the same position.

The contact block 171 preferably has a clearance G of 0.05 mm to 0.2 mm with the moving core block 131. In other words, it is preferable that the rotary jig 181 is stored so as to protrude from the contact block 171 by 0.05 mm to 0.2 mm. This is because when the clearance G exceeds 0.2 mm, the molding material is inserted between the fixed core block 121 and the moving core block 131 and / or between the contact block 171 and the moving core block 131 Accordingly, it is possible to form a solidified layer by contacting the fixed core block 121 having a relatively low temperature.

If the clearance G is less than 0.05 mm, the workability is difficult and the rolling effect may not be large, and there is a possibility that direct friction may occur between the contact block 171 and the moving core block 131.

Meanwhile, the moving core block 131 may be a molded core block that forms a cavity in the form of a molded product between the moving core block 131 and the first mold block. The moving core block 131 may be a dummy core block forming a dummy cavity around the cavity. The moving core block 131 may be a gate core block that forms a gate between the moving core block 131 and the first mold block.

In this case, the forming core block and the dummy core block may be vertically adjacent to each other. In this case, one of them becomes the moving core block 131 and the other becomes the fixed core block 121. In this case, one of the dummy core block and the gate core block becomes the moving core block 131, and the other one becomes the fixed core block 121. That is, the fixed core block 121 includes a block having a contact surface of the moving core block 131, as well as a block that is physically fixed, as well as a self-moving block.

The rotary jig 181 may have a spherical shape and may be made of a material difficult to thermally expand. When the rotary jig 181 is in the shape of a sphere, as shown in FIG. 4, the rotary jig 181 may be arranged side-by-side with the upper, lower, left, and right sides spaced apart.

The rotary jig receiving groove 178 has a radius equal to or slightly larger than that of the rotary jig 181 so that the rotary jig 181 can be rotated with the rotary jig inserted therein, It may be an inserted shape.

Meanwhile, the rotary jig 178 may be in the form of a roll as shown in FIG. In this case, the rotary jig receiving grooves 178 of the contact block may be arranged vertically side by side.

The rotary jig receiving groove 178 has the same or slightly larger radius as that of the rotary jig 181 so that the rotary jig 181 can be rotated with the rotary jig inserted therein, It may be a shape in which more than half is inserted.

Although the present invention has been described with reference to the preferred embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the following claims. It can be understood that

100: injection compression mold 110: first mold block
112: Spruce 114: Runner
120: second mold block 121: fixed core block
131: Moving core block 171: Contact block
181: Rotating jig

Claims (5)

A first mold block in which a sprue and a runner are formed to supply a molding material;
And a second mold block facing the first mold block and forming a cavity and a gate between the first mold block and the first mold block when the mold is closed,
The second mold block includes:
A fixed core block;
A moving core block inserted in the fixed core block and moving up and down;
And a rotating jig protruding from a side surface of the fixed core block and rotating while the moving core block is in contact with the ascending /
Wherein the rotary jig is formed by press-fitting a part of the rotary jig into the fixed core block in a rotatable manner,
Wherein the rotary jig is protruded from the fixed core block by 0.05 mm to 0.2 mm so that the gap between the fixed core block and the moving core block is 0.05 mm to 0.2 mm. A first mold block in which a sprue and a runner are formed to supply a molding material;
And a second mold block facing the first mold block and forming a cavity and a gate between the first mold block and the first mold block when the mold is closed,
The second mold block includes:
A fixed core block;
A moving core block inserted in the fixed core block and moving up and down;
A rotating jig protruding from the side surface of the fixed core block and rotating while the moving core block is in contact with the movable core block during ascending and descending;
And a plurality of jig receiving grooves into which the rotary jig part is rotatably inserted and inserted,
A contact block receiving groove is formed in a side surface of the fixed core block, the contact block is inserted into the contact block receiving groove,
The side surface of the stationary core block on which the contact block receiving groove is not formed and the side surface of the contact block are located at the same position without a step,
Wherein the rotary jig is protruded from the contact block by 0.05 mm to 0.2 mm so that the clearance between the contact block coupled to the fixed core block and the moving core block is 0.05 mm to 0.2 mm. mold. 3. The method of claim 2,
Wherein the rotary jig is in the shape of a ball. 3. The method of claim 2,
Wherein the rotary jig is a roller extending in the left and right direction and is arranged vertically in parallel. delete

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