KR20090066028A

KR20090066028A - Mold assembly

Info

Publication number: KR20090066028A
Application number: KR1020070133619A
Authority: KR
Inventors: 장명안
Original assignee: 한국단자공업 주식회사
Priority date: 2007-12-18
Filing date: 2007-12-18
Publication date: 2009-06-23

Abstract

The present invention relates to a mold assembly. The mold assembly according to the present invention includes: a first mold plate 32 installed on a fixed side plate 30 of a molding machine and having a first core 34 having a shape corresponding to a shape of a product on one surface thereof; It is installed on the movable side plate 38 of the molding machine and is in close contact with the first mold plate 32, and the part corresponding to the first core 34 cooperates with the first core 34 to correspond to the shape of the product. A second core plate 70 having a space for forming a space therebetween, and having an air chamber 52 into which air is introduced; The air flow path is formed inside the support plate 42 on which the second plate 50 or the second plate 50 is installed, and communicates with the air chamber 52 to inject air into the air chamber 52. 44; It is installed in the air chamber 52 to be movable in the relative movement direction of the first plate 32 and the second plate 50 by the air introduced through the air flow path 44 and the air chamber 52 It comprises a mill pin 60 to move in the product direction to take out the product (P).

According to the mold assembly according to the present invention having such a configuration, since the mill pin for taking out the product is operated by the pressure of air, the structure of the mold assembly is simplified, maintenance is easy, and the product takes out quickly. have.

Description

Mold assembly

The present invention relates to a mold assembly, and more particularly, to a mold assembly having a mill pin for taking out a product by solidifying after the molten resin is introduced into the cavity.

In general, an injection mold injects a molten resin into a cavity formed by combining an upper mold and a lower mold to mold a product, and molds the product through a series of processes of taking out the product when the molten resin filled in the cavity is solidified.

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

The mold assembly 1 has a main core (4, 4 ') provided in the upper mold (3) provided on the fixed side of the molding machine and the lower mold (3') provided on the movable side to cooperate to make a product (P) Serve That is, when the molten resin flows into the cavity 5 formed by the main cores 4 and 4 'and then solidifies, the molding of the product P is completed.

On the other hand, the mold assembly (1) is provided with a mill pin (7). The mill pin (7) serves to take out the product (P) from the mold assembly (1), generally installed on the movable side. The mil pin 7 is separated from each other on the movable side and the fixed side at the same time protrudes toward the fixed side to push up the product (P).

At this time, the mill pin (7) is raised by the mill plate (9) provided on the movable side, the mill plate (9) is connected to the eject rod (not shown) to be elevated by a separate drive source is raised. .

Then, after the mill pin 7 is raised to take out the product P, it is returned to its original position, which is made by an elastic member such as a coil spring (not shown) provided on the movable side. That is, the elastic member provides the elastic plate in the direction away from the main core (4, 4 ') to return to the original position.

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

First, in order to take out a product in the prior art, a separate mill 9 is installed, and the mill pin 7 must not interfere with a cooling flow path of a mold, so that the installation process is complicated and easy to maintain in case of failure. There was a problem that did not.

In addition, the close plate (9) is operated by a separate drive source after the movable side is completely separated from the fixed side, which causes a problem in that the time required for the production of the product (P) becomes longer and the productivity is lowered.

The present invention is to solve the problems of the prior art as described above, the object of the present invention is to provide a mold assembly that is easy to maintain by simplifying the product take-out structure.

In addition, another object of the present invention is to provide a mold assembly in which the operation of the mill pin for taking out the product is made quickly.

According to a feature of the present invention for achieving the above object, the present invention is provided on a fixed side plate of the molding machine, the first mold having a first core having a shape corresponding to the shape of the product on one surface; It is installed on the movable side plate of the molding machine and is in close contact with the first die plate, and the part corresponding to the first core is provided with a second core to make a space corresponding to the shape of the product in cooperation with the first core, A second template having an air chamber into which air is introduced; An air flow path formed inside the support plate on which the second template plate or the second template plate is installed and communicating with the air chamber to inject air into the air chamber; And a mill pin installed in the air chamber so as to be movable in the relative movement direction of the first plate and the second plate to move in the product direction by the air introduced through the air flow path and the air chamber to take out the product. do.

The mill pin may extend through the second core, a body part formed to extend in a relative movement direction between the first plate and the second plate, a hydraulic part protruding to an inner diameter of the air chamber around the outer circumferential surface of the body part, and the second core. Is provided at one end of the body portion is configured to include a take-out portion for taking out the product.

The pressure receiving portion is formed in a disk shape protruding orthogonally from the outer circumferential surface of the body portion, the outer diameter of the pressure receiving portion is formed to be less than or equal to the inner diameter of the air chamber.

The take-out part is formed to have a smaller cross-sectional area as it moves away from the product, and a seating pocket having a shape corresponding to the take-out part is formed in the second core.

The air chamber is provided with an elastic member for providing an elastic force in a direction away from the product to the pin, the end of the elastic member is supported by the hydraulic portion.

The elastic member is a coil spring provided around the outer circumferential surface of the mill pin.

Inside the air passage, a gate communicating the air passage and the air chamber with each other is formed to face the hydraulic part of the mill pin.

According to the present invention, since the mill pin for taking out the product is operated by the pressure of air, the structure of the mold assembly is simplified, and maintenance is easy.

In addition, in the present invention, since the operation of the mill pin occurs separately from the movement of the movable side plate, the take-out process of the product occurs quickly. This shortens the manufacturing time of the product, leading to an improvement in productivity.

In addition, the air flowing in the process of the operation of the pin is heat exchange in the mold, thereby improving the cooling efficiency of the mold.

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

2 is a cross-sectional view showing the configuration of a preferred embodiment of the mold assembly according to the present invention, Figure 3 is a mold assembly in which the movable side plate is separated in the embodiment of the present invention.

As shown in these figures, the fixed side plate 30 is provided on the fixed side of the molding machine (not shown). The fixed side plate 30 is a plate having a predetermined area, the first mold plate 32 is installed on one surface thereof. The first mold 32 is formed such that the first core pocket 32 'is recessed.

The first core 34 is installed inside the first core pocket 32 ′. The first core 34 is formed to correspond to a part of the outer surface of the product (P). The first core 34 is a part producing the product P in cooperation with the second core 70 to be described below.

On the other hand, the movable side plate 38 is provided on the movable side of the molding machine. The part provided in the said movable side plate 38 and moved together is called a movable side. The movable side plate 38 has a plate shape having an area corresponding to the fixed side plate 30.

The support plate 42 is installed on the movable side plate 38 by the spacer block 40. An air flow path 44 through which air moves is formed in the support plate 42. The air flow path 44 extends long from one side of the support plate 42 to the inside of the support plate 42 located vertically below the product P.

Inside the air passage 44, a gate 44 ′ facing the second template 50 to be described below is formed in communication with the air passage 44. The gate 44 ′ is a passage connecting the air chamber 52 and the air passage 44 to be described below. Preferably, the gate 44 'is directed toward the hydraulic part 62 of the mil fin 60, which will be described below, so that the air pushes the hydraulic part 62 directly.

Although the air flow path 44 and the gate 44 'are separately marked, the air flow path 44 and the gate 44' may be viewed as an extension of the air flow path 44 because they form a path through which air moves. have.

The second plate 50 is installed on the support plate 42 to face the first plate 32. The first mold plate 42 and the second mold plate 50 are in close contact with each other at the time of molding the product P, and are separated when the molded product P is taken out. This is done by moving the movable side of the molding machine relative to the stationary side.

The second core pocket 50 ′ is formed on the second mold plate 50. The second core pocket 50 ′ is formed with an area corresponding to a position corresponding to the first core pocket 32 ′.

An air chamber 52 is formed in the second mold 50 so as to communicate with the air flow path 44. In more detail, the air chamber 52 is connected to the air flow path 44 through the gate 44 '. The air chamber 52 is formed in a shape corresponding to the pressure receiving part 62 of the mil fin 60 and extends a predetermined distance toward the product P from the lower end of the second mold plate 50.

The air pin 52 is provided with a mil pin 60 to reciprocate toward the product P. The mill pin 60 serves to separate the molded product P from the second core 70 to be described below. The mill pin 60 extends through the second core 70, which will be described below, to the cavity forming the product P.

The body portion 61 of the mil pin 60 is formed in a rod shape having a predetermined length in the relative movement direction of the first mold plate 32 and the second mold plate 50. At about the middle of the mill pin 60, the pressure receiving portion 62 is formed in a disk shape protruding orthogonally from the outer circumferential surface of the body portion 61. The pressure receiving part 62 serves to move the mil pin 60 by the air flowing through the air flow path 44.

The pressure receiving portion 62 is provided in a plate shape of various shapes, in the present embodiment will be described taking the original plate as an example for convenience of description. According to the design conditions, when the hydraulic part 62 is formed in a polygonal plate shape such as a square or a pentagon, not a disc, the rotation of the mill pin 60 may be prevented. Of course, at this time, the air chamber 52 is also formed in a shape corresponding thereto.

The outer diameter of the hydraulic part 62 is formed to be larger than the outer diameter of the mil fin 60, but is formed to be smaller than or equal to the inner diameter of the air chamber 52. That is, the outer diameter of the hydraulic part 62 should be formed so as to correspond appropriately to the inner diameter of the air chamber 52, which is equal to or more than the inner diameter of the air chamber 52. If large, the mil fin 60 cannot move in the air chamber 52, and if the outer diameter of the hydraulic part 62 is too small compared to the inner diameter of the air chamber 52, sufficient force for the mil fin 60 to move. Because you do not receive.

And, the upper surface of the pressure receiving portion 62 is installed to support the elastic member (s). The elastic member s provides an elastic force in a direction away from the product P in the air chamber 52. The elastic member (s) allows the mill pin 60 to quickly return to the original position after taking out the product (P). Coil spring may be used as the elastic member (s), in which the spring is preferably installed around the outer circumference of the mill pin (60).

On the other hand, the extraction unit 64 is provided at one end of the mill pin 60 facing the product (P). The take-out part 64 is formed in a trapezoidal shape whose cross section is shorter than the top side, and the take-out part 64 is easily moved. When the ejection portion 64 is filled with molten resin in the cavity and the product P is being molded, the ejection portion 64 is seated in the seating pocket 70 'of the second core 70. At this time, one surface of the ejection portion 64 is Forms part of the cavity.

In this embodiment, the air flow path 44 is formed in the support plate 42, the air chamber 52 is formed in the second mold 50, the air flow path 44 or the air chamber 52 is a design condition According to the present invention, the product P may be formed at various positions. For example, both of the air flow path 44 and the air chamber 52 may be formed in the support plate 42 or in the second mold plate 50.

The second core 70 is installed in the second core pocket 50 ′. The second core 70 is formed to have a size corresponding to a position corresponding to the first core 34 in order to form the product P in cooperation with the first core 34. The second core 70 is formed with a seating pocket 70 'on which the outlet portion 64 is seated. The seating pocket 70 ′ is formed to be inclined at a side surface corresponding to the shape of the outlet 64.

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

First, when the movable side plate 38 moves so that the first plate 32 and the second plate 50 are in close contact with each other to produce the product P, the first core 34 and the second core 70 are moved. ) Forms a predetermined space between the two.

In this state, the molten synthetic resin is supplied into the space formed by the first core 34 and the second core 70 and undergoes a cooling process for forming the synthetic resin into the product P.

When the product P is formed by the above process, the movable side of the molding machine moves to separate the first mold plate 32 and the second mold plate 50. When the movable side is separated from the fixed side, high pressure air is injected through the air passage 44.

When air is injected into the air passage 44, air is introduced into the air chamber 52 through the gate 44 ′. At this time, when the air pressure increases, the elastic force of the elastic member s is overcome, and the pressure receiving part 62 is pushed up in a direction closer to the product P.

On the other hand, heat is generated by friction in the process of the operation of the mill pin 60, the air of the air flow path 44 is heat-exchanged with the mill pin 60 and the second mold 50, the mill pin ( Cool the periphery of 60).

When the pressure receiving part 62 moves toward the fixed side plate 30 by the pressure of air, the extraction part 64 provided at the tip of the mill pin 60 receives the product P from the second core 70. ). This state is well illustrated in FIG. 3.

After the product P is taken out, the air injected into the air flow path 44 is discharged to the outside. Therefore, when the air pressure of the air chamber 52 is lowered, the elastic force of the elastic member s pushes the hydraulic part 62 in a direction away from the product P. When the mil pin 60 moves toward the movable side plate 38, the takeout part 64 is seated on the seating pocket 70 ′ of the second core 70.

As described above, the mil pin 60 operated by air has a simple operation structure, and the mil pin 60 can be operated while the movable side plate 38 moves, so that the product taking-out process occurs quickly.

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.

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

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 cross-sectional view showing a mold assembly separated from the movable side plate in the embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

30: fixed side plate 32: first mold plate

34: 1st core 38: movable side plate

40: spacer block 42: support plate

44: Air Euro 44 ': Gate

50: second template 52: air chamber

60: Milpin 61: Body

62: water pressure part 64: blowout part

70: 2nd core 72: Seating pocket

S: elastic member

Claims

A first mold plate provided on a fixed side plate of the molding machine and having a first core having a shape corresponding to the shape of the product on one surface thereof;

It is installed on the movable side plate of the molding machine and is in close contact with the first die plate, and the part corresponding to the first core is provided with a second core to make a space corresponding to the shape of the product in cooperation with the first core, A second template having an air chamber into which air is introduced;

An air flow path formed inside the support plate on which the second template plate or the second template plate is installed and communicating with the air chamber to inject air into the air chamber;

It is installed in the air chamber to be movable in the relative movement direction of the first plate and the second plate and comprises a pin pin to move in the product direction by the air introduced through the air flow path and the air chamber to take out the product Mold assembly characterized in that.

The method of claim 1, wherein the milpin,

A body portion formed to be elongated in the relative movement direction of the first template plate and the second template plate,

A hydraulic pressure unit configured to protrude to an inner diameter of the air chamber by surrounding the outer circumferential surface of the body unit;

Mold assembly characterized in that it comprises a take-out portion is provided in one end of the body portion penetrating the second core to take out the product.

The mold assembly according to claim 2, wherein the hydraulic pressure portion is formed in a disc shape protruding orthogonally from the outer circumferential surface of the body portion, and the outer diameter of the hydraulic pressure portion is smaller than or equal to the inner diameter of the air chamber.

The mold assembly according to claim 3, wherein the take-out part is formed to have a smaller cross-sectional area as it moves away from the product, and a seating pocket having a shape corresponding to the take-out part is formed in the second core.

According to any one of claims 2 to 4, wherein the air chamber is provided with an elastic member for providing an elastic force in the direction away from the product in the air pin, the elastic member is supported on one end of the elastic member Mold assembly.

The mold assembly according to claim 5, wherein the elastic member is a coil spring provided around the outer circumferential surface of the mill pin.

7. The mold assembly of claim 6, wherein a gate for communicating the air flow path and the air chamber with each other is formed at an inner side of the air flow path so as to face the hydraulic part of the mill pin.