KR20150090608A - Injection mold - Google Patents

Abstract

The present invention relates to an injection mold having a function of automatically separating runners, ensuring deletion of a post-process which is to separate the injection products and the runners by consisting of the injection product molded in the molding space and the runner formed in a gate block to be automatically separated in a demolding process in order to mold injection-molded injection products by which a gate block inserts molten material along with the gate into a molding space between a fixing-type board and an operation-type board.

Description

Injection mold having an automatic separation function of a runner

The present invention relates to an injection mold having an automatic separating function of a runner. In molding an injection article by injecting a melt along a gate in a molding space formed between a fixed plate and a movable mold, The present invention relates to an injection mold having an automatic separating function of a runner which is capable of automatically separating a runner formed in an injection mold and a gate block in a demolding process, thereby eliminating a post-process for separating an injection mold and a runner.

In general, injection molding is one of the most widely used manufacturing methods for molding plastic products, in which a resin melted in a heating cylinder is injected into a cavity of a closed mold at a high pressure to solidify or cure the resin, It is a way to make an exhibition.

Such a mold is formed of a material such as a metal having excellent heat resistance, and has a plurality of cavities formed in a shape corresponding to an injection product to be manufactured, a sprue into which the molten resin is injected, There is provided a runner which is supplied in a dispersed manner to a cavity and a gate which is formed so as to have a relatively small cross sectional area as compared with the runner and which controls the flow of the molten resin injected into the cavity.

Therefore, the molten resin injected from the nozzle of the injection molding machine solidifies after being filled with the cavity through the sprue, the runner and the gate of the mold, and when the solidified article is separated from the mold, the unnecessary parts such as sprue, Is also taken out together with the cavity, a post-process for removing an unnecessary portion from the product is required.

Recently, a structure for removing a gate or a runner by a separate driving means (a hydraulic or pneumatic cylinder, a spring elasticity mechanism, etc.) in a mold has been disclosed in order to prevent the loss of working time and work loss due to such separate post- .

For example, Korean Utility Model Laid-Open No. 1998-0021974 discloses an upper and a lower plate coupled to a lower side of a fixed side attachment plate on which a sprue bush is provided and a fixed side attachment plate, A first ejector pin provided on the lower side of the center of the article to be formed into a predetermined shape by the lower die plate and which is provided with a gate to be engaged with the gate, an upper and a lower ejector platter connected to the first ejector pin and ascending and descending, The upper and lower ejector plates are lifted up through a mold including a second ejector pin that is formed inside the ejector platen to disengage the discharged product and a movable attachment plate for opening the upper and lower mold plates, And a gate is hit.

Conventional gate cutting devices driven by hydraulic or pneumatic cylinders, spring elastic mechanisms, etc., as in the prior art, are complicated in construction and difficult to install.

(Patent Document 1) KR10-0198273 B1

(Patent Document 2) KR 10-1183171 B1

(Patent Document 3) KR 20-0462247 Y1

(Patent Document 4) KR 20-0194537 Y1

It is an object of the present invention, which is devised to solve the problems described above, to provide a method of automatically removing an injection object molded in a molding space and a runner formed in a gate block during a demoulding process, and,

In particular, it is an object of the present invention to provide an injection mold having an automatic separation function of a runner which is configured to form a fixed state during the separation process of an injection product and a runner, thereby eliminating the problem that the injection product is deformed or damaged during the separation process.

The above object is achieved by the following constitutions provided in the present invention.

In the injection mold having the stable separation function of the runner according to the present invention,

A fixed plate on which a molding space is formed; A movable mold plate provided on one of the stationary molds in a retracted configuration and having a molding space; And a gate block for injecting a molten material supplied from the extruder along the injection path through a gate into the molding space formed between the fixed plate and the movable die to mold the molten material cured in the molding space, In this case,

Wherein the gate block is installed in a sliding structure along a guide path formed in the movable mold plate,

The inclined grooves are inclined in the gate block, the inclined grooves of the gate block are inclined in the fixed plate facing the inclined grooves, and the inclined pins for advancing the gate block to the front where the molding space is formed are formed,

When the movable plate is brought into close contact with the fixed plate to close the molding space, the inclined fin advances the gate block while entering the inclined groove to connect the gate to the closed molding space,

When the movable plate is spaced apart from the fixed plate and the molding space is opened, the inclined fin is discharged from the inclined groove and the gate block is retracted to separate the article formed in the molding space and the runner formed in the gate.

Preferably, the stationary plate is provided with an advancing / retreating path, and the movable forming core for guiding and fixing the connecting part between the article formed in the forming space and the runner formed in the gate block is provided with a forward / Lt; / RTI >

In the process of separating the runner from the run through the withdrawal of the gate block, the connection part between the runner and the runner is rubbed by the movable forming core so that the runner is separated from the runner with the movable part fixed in the molding space by the movable forming core. .

More preferably, the movable molding core provided in the advancing / retreating structure of the fixed plate is resiliently biased by a pressing spring, and is housed in the forward / backward path of the fixed plate when the movable mold plate and the fixed plate are in close contact with each other and the molding space is closed, And the fixed plate are spaced apart to open the forming space, the movable plate is advanced along the forward / backward path and protrudes to the inner wall of the molding space of the fixed plate.

When the movable block and the fixed block are spaced apart from each other and the molding space is opened, the gate block is retracted backward by the spring of the spring, and the movable block is moved to the fixed position .

As described above, according to the present invention, the gate block is provided in a sliding structure, and the gate block is moved forward and backward by interlocking with the movable plate. The injection product is spaced apart from the molding space so that the injection product and the runner are automatically separated.

Accordingly, since the present invention is separated from each other in the demolding process of the yarn product and the runner, it is possible to eliminate the post process for separating the runner from the yarn product, and it is possible to improve the productivity and reduce the incidental cost due to the production.

Particularly, in the present invention, since the movable molding core is added and the injection molding is fixedly fixed in the molding space in the process of separating the injection molding and the runner, the shape of the injection molding is prevented from being deformed during the process of separating the molding from the runner, The failure rate can be reduced.

In addition, according to the present invention, by arranging the spring blocks retracting the gate block so that the gate blocks are always located at the predetermined positions, the inclined pins entering the inclined grooves of the gate block are damaged The breakage phenomenon is prevented.

FIG. 1 is a front view showing the entire configuration of an injection mold having a stable separating function of a runner, which is a preferred embodiment of the present invention,
FIGS. 2 to 4 are operation state diagrams sequentially illustrating the molding process of an injection molding through an injection mold having a stable separating function of a runner, which is a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an injection mold having a stable separating function of a runner proposed in the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view showing the entire configuration of an injection mold having a stable separating function of a runner proposed in the preferred embodiment of the present invention. FIG. 2 to FIG. 4 are cross- FIG. 4 is a view showing an operation state of the molding process of an injection mold through an injection mold having a stable separation function in sequence.

As shown in FIG. 1, the injection mold 1 having a stable separating function of the runner proposed in the preferred embodiment of the present invention comprises a fixed plate 10 on which a molding space 11 is formed; A movable mold plate 20 installed on one side of the fixed mold plate 10 and having a molding space 21 formed therein; The solutes P supplied from an extruder (not shown) are injected into the molding spaces 11 and 21 formed between the fixed plate 10 and the movable mold plate 20 along the injection path 15 with the gate 31 And a gate block 30 for injecting the molten material P into the molding spaces 11 and 21 to form a cured product M of the melt.

1 to 4, the fixed plate 10 and the movable plate 20 are disposed in a vertically erected state. When the fixed plate and the movable plate are separated from each other to open the molding space, The injection molded product is shaped so that it falls down to the lower portion where the discharge conveyor (not shown) is formed and is discharged.

The movable plate 20 is moved forward and backward by a normally advancing / retreating member (not shown) to close the molding spaces 11 and 21 through close contact with the fixed plate 10 and to separate the movable plate 20 from the fixed plate 10 The molding space 11 and the molding space 21 are opened through the through hole 20 and the fixed plate 10 and the movable plate 20 may be structurally replaced as necessary.

One or more mold release holes 23 and 34 are formed in the molding space 21 formed in the movable mold plate 20 and the gate block 30 provided in the movable mold plate 20, A demoulding pin (41) for advancing and retracting the demoulding holes (23, 34) is provided in a forward and backward movement structure.

Referring to the drawing, the demoulding pins 41 are fixed to a single advancing / retreating plate 40 advanced and retreated by a cylinder (not shown) (23, 34).

2, in a state where the fixed plate 10 and the movable plate 20 are in close contact with each other and the molding spaces 11 and 21 are closed, the gate block 30 is moved along the injection path 15 to an extruder (not shown) The molten material P is cured in the molding spaces 11 and 21 closed by injecting the molten material P supplied from the gate block 30 through the gate 31. At this time, The runner R connected to the print product M is formed.

4, when the movable mold 20 is separated from the fixed mold 10 and the molding spaces 11 and 21 are opened, the mold releasing pin 41 moves along the mold releasing holes 23 and 34 11 and 21 and the gate 31 of the gate block 30 to demagnetize the separated article M and the runner R separated from each other.

In the present invention, when the injection mold 1 is implemented, the molding spaces 11 and 21 in which the projected product M is molded and the gate block 30 in which the runner R is formed are separated from each other, The article M and the runner R are demarcated and separated from each other in the demolding process through the opening of the molding spaces 11 and 21.

1 to 4, the gate block 30 for injecting the melt P into the molding spaces 11 and 21 closed through the gate 31 is connected to the movable mold 20 And the molding space 11 and 21 and the gate 31 are communicated with each other in the injection molding process of the product M through the injection of the melt P, The molding spaces 11 and 21 and the gates 31 of the gate block 30 are separated from each other so that the projected product M and the runner R are separated from each other, .

In the present embodiment, the gate block 30 is installed along the guide path 22 formed behind the molding space 21 of the movable die plate 20 in a sliding structure.

The inclined grooves 33 are inclined in the gate block 30 and the inclined grooves 33 of the gate block 30 are formed on the fixed plate 10 facing the inclined grooves 33, A slanting pin 12 for advancing the slanting plate 21 forward is formed.

At this time, the gate block 30 provided in the guide path 22 of the movable plate 20 is moved rearward by the spring 32 so that the movable plate 20 and the fixed plate 10 are separated from each other When the molding spaces 11 and 12 are opened, the gate block 30 retreats rearward due to the elastic function of the spring 32 and is positioned at a predetermined position.

The inclined pin 12 that enters the inclined groove 33 of the gate block 30 is physically moved to the gate block 30 by the vibration of the gate block 30, Collision, damage or breakage is prevented.

2, when the movable mold 20 is brought into close contact with the fixed mold 10 and the molding spaces 11 and 21 are closed, the slope fin 12 enters the inclined grooves 33, To connect the gate 31 to the closed forming spaces 11 and 12. [

3 and 4, when the movable mold plate 20 is separated from the fixed mold plate 10 and the molding spaces 11 and 21 are opened, the inclined fin 22 is discharged from the inclined grooves 33 As a result, the print product M formed on the molding spaces 11 and 21 and the runner R formed on the gate 31 are separated.

2, the gate block 30 installed in the movable mold 20 advances to form a connection with the molding spaces 11 and 21, and the molten metal supplied from the extruder through the gate 31 (P) is injected into the molding spaces (11, 21) and injection-molded.

When the injection molding is completed, the gate block 30 is retreated to be spaced apart from the molding spaces 11 and 21 as shown in FIG. 3. As a result, the runner R formed in the gate block 30, The injection molds M formed on the molds 11 and 21 are physically separated.

4, the separated article M and the runner R are discharged to the outside by the demoulding pin 41 protruding along the demoulding hole.

Thus, the injection mold 1 according to the present embodiment is separated by the demoulding pin 41 after the project M and the runner R are separated in the demolding process, And the inclined grooves 33 are connected to each other through the inclined fins 12 and the inclined grooves 33 without separate advance and retreat means such as solenoids and cylinders, The structure is simplified because the formal progression is made.

Since the gate block 30 is fixed to the fixed position by the spring 32, the gate block 30 may deviate in position due to vibration or impact, The slope pin 12 entering the gate block 33 physically collides with the gate block 30 and is prevented from being damaged or damaged.

In addition, in the present invention, in separating the projected product M and the runner R through the retreat of the gate block 30, the projected product M is fixedly fixed in the molding space 21 during the separation process, So that the projected product M is separated from the molding space 21 in the process of separating the runner R and the projected product M through the retreat of the gate block 30, M) is changed, or the appearance of the product (M) is damaged.

To this end, in the present embodiment, as shown in Figs. 1 to 4, a forward / backward path 13 is formed in a molding space 11 of the fixed plate 10, And the movable molding core 14 for fixing and fixing the connection part between the projection product M and the formed runner R in the gate block 30 is provided in a forward and backward movement structure.

The movable molding core 14 provided in the advancing / retreating structure 13 of the fixed plate 10 is resiliently biased by the pressing spring 14a so that the movable plate 20 and the fixed plate 10 come into close contact with each other, When the movable mold 20 and the fixed mold 10 are separated from each other and the molding spaces 11 and 21 are opened when the molds 11 and 21 are closed, 14 along the advancing and retreating path 13 of the fixed plate 10 and protruding to the inner wall of the molding space 11. [

3, the connection portion between the print product M and the runner R in the process of separating the projected product M and the runner R through the retraction of the gate block 30 is formed by the movable molded core 14, And the yarn M is separated from the runner R in a state that the yarn M is fixed to the molding space 21 by the movable molding core 14. After the separation is completed, And then is demoulded by the demoulding pin 41 as shown in FIG. 4, and is dropped down to the lower portion and discharged.

Thus, the injection mold 1 according to the present embodiment is configured such that the yarn M and the runner R, which require separation, are fixed by the movable molding core 14 to separate the injection molding M and the runner R The shape of the injection product M is prevented from being deformed or damaged during the process of separating the injection molding M and the runner R since the injection molding M is fixed in the molding space 21 in a process.

1. Injection mold
10. Fixed plate 11. Molding space
12. Slope pin
14. Movable forming core 14a. Pressure spring
20. Movable template 20a. Absence of retraction
21. Molding space 22. Guide
23. Demolition Ball
30. Gate block 31. Gate
32. Spring 33. Inclined groove
34. demolding ball
40. Demolding plate 41. Demolding pin
P. MOLTEN M. PRODUCTS
R. Runner

Claims (3)

A fixed plate on which a molding space is formed; A movable mold plate provided on one of the stationary molds in a retracted configuration and having a molding space; And a gate block for injecting a molten material supplied from the extruder along the injection path through a gate into the molding space formed between the fixed plate and the movable die to mold the molten material cured in the molding space, In this case,
Wherein the gate block is installed in a sliding structure along a guide path formed in the movable mold plate,
The inclined grooves are inclined in the gate block, the inclined grooves of the gate block are inclined in the fixed plate facing the inclined grooves, and the inclined pins for advancing the gate block to the front where the molding space is formed are formed,
When the movable plate is brought into close contact with the fixed plate to close the molding space, the inclined fin advances the gate block while entering the inclined groove to connect the gate to the closed molding space,
Wherein when the movable plate is spaced apart from the fixed plate and the molding space is opened, the inclined fin is withdrawn from the inclined groove and the gate block is retracted to separate the article formed in the molding space and the runner formed in the gate. Injection mold with stable separation function. The movable molding core according to claim 1, wherein a forward / backward path is formed in the molding space of the fixed plate, and a movable molding core for fixing and fixing the connection part between the yarn product molded in the molding space and the runner formed in the gate block It is installed in the forward and backward structure,
In the process of separating the runner from the run through the withdrawal of the gate block, the connection part between the runner and the runner is rubbed by the movable forming core so that the runner is separated from the runner with the movable part fixed in the molding space by the movable forming core. Wherein the sprue is formed on the inner surface of the injection mold. The movable mold as claimed in claim 2, wherein the movable molding core provided in the advancing / retreating structure of the fixed plate is resiliently biased by a pressure spring so that when the molding space is closed by the movable mold plate and the fixed mold plate, Wherein the mold and the stationary plate are separated from each other, and when the molding space is opened, the mold and the stationary plate are advanced along the forward / backward path and protrude from the inner wall of the molding space of the stationary plate.

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