KR20160099141A - Die casting apparatus - Google Patents

Abstract

The present invention relates to a die-casting apparatus, and more particularly, to a die-casting apparatus which is provided with a valve for directly forming a molten metal injection port (sprue) on a product surface (cavity) of a mold, , And the amount of molten metal (shot weight) required for one injection, thereby reducing the consumption of raw materials.
The main constituent of the present invention is a combination of a movable side mold and a fixed side mold. The fixed side mold is provided with a sleeve 1, the sleeve 1 is provided with a pressing means 10, A die-casting apparatus for producing a product in a cavity-shaped form by being injected into a cavity, characterized in that the fixed-side mold (120) is provided with an opening / closing device (50) capable of blocking the passage of the sleeve (1) The moving plate 52 is provided with a through hole 55. The through hole 55 is formed in the moving plate 52, And the molten metal is injected or blocked through the through hole 55 according to the forward and backward movement of the moving plate 52. The fixed side mold 120 is formed with a sprue 60 communicating with the cavity , And the The fixed side mold 120 is provided with a bushing 61 communicating with the cavity and the movable side mold 130 is provided with a protrusion 63 protruding from the fixed side mold 120. The protrusion 63 Is formed in a passage of the sprue 60 formed in the fixed side mold 120. The fixed side mold 120 is formed with a molten metal injection portion 64 communicating with the cavity, 64 are communicated with the sprue 60 formed on the stationary-side mold 120. [

Description

[0001] DIE CASTING APPARATUS [0002]

The present invention relates to a die-casting apparatus, and more particularly, to a die-casting apparatus which is provided with a valve for directly forming a molten metal injection port (sprue) on a product surface (cavity) of a mold, , And the amount of molten metal (shot weight) required for one injection, thereby reducing the consumption of raw materials.

In general, die casting method is a method to cast molten metal automatically or manually by using a precision mold and apply pressure to the molten metal. Since it is high in dimensional precision, machine finishing is unnecessary and non-ferrous metal with a small specific weight is used. It is widely used in the manufacture of parts.

The die-casting method can be divided into a hot-chamber type die casting and a cold-chamber type die casting according to a pressurizing method.

[Patent Document 1] Patent Application Number: 10-2007-0021468 {filing date: 2007.03.05}

In the above-mentioned document 1, as shown in a conventional die casting mold, the sleeve forming the sprue for injecting the molten metal is connected to the male and female molds, and is installed deeply in one of the molds. It is connected to the cavity.

1 is a view showing a conventional cold pressing die casting apparatus which is directly related to the present invention, and includes a sleeve 1 for receiving molten metal supplied from an external melting furnace (not shown), a pressing means 10 for pressing the molten metal, And a stationary-side mold 20 and a movable-side mold 30 which are etched on the surfaces facing each other.

The fixed-side mold 20 is fixed to the fixed-side mold plate of the die-casting machine (not shown), and can be combined with the movable-side mold 30 by the guide pin provided therein. 20 and the movable mold 30 are combined into one, a space (i.e., a cavity) in which the two molds face each other is etched to form a cavity. When the cavity is filled with the molten metal and cooled, The product having the same shape as the product 31 can be obtained.

One end of the sleeve 1 is connected to the etched portion of the mold, and on the upper side thereof, a mold spout 3 of a cut shape is formed so that the molten metal can be supplied from an external melting furnace.

The pressing means 10 is provided with a plunger 11 capable of linear reciprocating motion in the sleeve 1 so as to pressurize the molten metal in the sleeve 1 supplied from an external melting furnace, Are connected through a rod (13) to a cylinder (12) generating a pressing force.

In the conventional die casting apparatus thus constructed,

One. A step (mold closing) of transferring the movable-side mold 30 onto the fixed-side mold 20 and coupling them together,

2. Injecting molten molten metal into the sleeve 1 from an external melting furnace,

3. A step (injection) of pressing the molten metal by using the plunger 11 of the pressing means and injecting the molten metal into the portion of the cavity 31 etched in the mold to cast the etched product,

4. A step (mold) for transferring the movable-side mold 30 and separating the movable-side mold 30 from the fixed-side mold 20,

5. The operation is carried out by taking out the product by using the eject pin 5 provided on the movable side mold 30 (or the fixed side mold 20) (taking out).

However, in the conventional casting using such a die casting apparatus and a mold, shapes other than the product shape such as the biscuit and the runner 2 are further integrally formed together with the product shape, As a result, an additional excessive amount of raw material is consumed in addition to the product shape. Also, it takes a lot of time to remove unnecessary parts, which are heavy and bulky.

In addition, the pressing force generated at the tip of the plunger 11, which is the pressing means, is not effectively transmitted to the space formed by the etched surface of the mold, that is, to the molten metal filled in the cavity 31, Resulting in inconsistent and uneven structure of the product, resulting in deterioration of product strength, poor appearance, and post-processing such as welding and heat treatment.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a method of manufacturing a mold, in which a sprue, which is a sprue, is directly formed on a cavity surface of a mold, By forming a valve capable of opening and closing the sprue at an appropriate time, it is possible to minimize the additional shape of the biscuit, runner, etc. removed in the subsequent process, thereby reducing the consumption of the raw material and effectively transferring the casting pressure to the molten metal in the cavity, The present invention provides a die casting apparatus and a mold structure capable of producing a product having improved internal defects such as pores.

In order to accomplish the above object, the present invention is characterized in that the main component of the present invention is a combination of a movable side mold and a fixed side mold, the sleeve 1 is inserted into the fixed side mold, The die-casting apparatus includes a stationary mold 120 provided with an opening / closing device 50 capable of shutting off the passage of the sleeve 1, and a mold- Wherein the opening and closing device 50 comprises a driving device 53 composed of a cylinder and a rod and a moving plate 52 installed at the rod end. And the molten metal is injected or blocked through the through hole 55 according to the forward and backward movement of the moving plate 52. The fixed mold 120 is provided with a through hole 55 communicating with the cavity Spruce (60) The fixed side mold 120 is provided with a bushing 61 communicating with a cavity. The movable side mold 130 is provided with a protrusion protruding from the fixed side mold 120 The fixed side mold 120 or the movable side mold 130 is formed with a cavity 63. The cavity 63 is formed in a passage of the sprue 60 formed in the fixed side mold 120. In the fixed side mold 120, And the molten metal injection portion 64 is configured to communicate with the sprue 60 formed in the stationary-side mold 120. As shown in Fig.

According to the present invention, there is provided a die casting mold structure which is capable of directly injecting molten metal in a sleeve into a cavity of a mold to reduce consumption of raw materials, and to effectively deliver the casting pressure during cooling to obtain a compact and free of internal pore.

According to the present invention, after the sleeve 1 is sufficiently filled with the molten metal by providing the opening / closing device 50 at the tip of the sleeve 1, the moving plate 52 is moved to open the passage to melt the molten metal in the cavity 31 The molten metal can not be sufficiently filled in the sleeve 1, so that it is possible to prevent the introduction of the air that has been injected together, so that the product can be prevented from generating pores therein.

According to the present invention, even if there is no runner to be machined in the movable-side mold 130, since the movable-side mold 130 has a minimum structure compared with the conventional one, the manufacturing cost of the movable-side mold 130 is reduced.

1 is a view showing a conventional die casting apparatus and a mold;
2 and 3 are views showing an embodiment of the present invention
Figures 4 and 5 show another embodiment of the present invention.

Hereinafter, the present invention will be further described with reference to the accompanying drawings

2 and 3 are sectional views showing the die casting apparatus and the mold structure according to the present invention. The molten metal contained in the sleeve 1 is pressurized by the pressurizing means 10 in the same manner as in the prior art.

The die casting mold of the present invention comprises an opening / closing device (50) for controlling the filling of molten metal in a sleeve supplied from an external melting furnace into a cavity of a mold, And a sprue 60 directly connected to the cavity 31 of the mold to form a flow path of the molten metal at the time of casting.

The opening and closing device 50 is provided with a fixing device 51 for mounting on the fixed side mold 120 and a fixing device 51 which is interposed between the sprue 60 and the sleeve 1 to supply or supply the molten metal to or from the mold cavity 31. [ And a driving device 53 connected to one end of the moving plate 52 to enable reciprocating movement of the moving plate.

The driving device may be constituted by, for example, a normal cylinder and a piston capable of reciprocating motion in the forward and backward directions, but may also be reciprocated in other configurations.

The sprue 60 may be formed as a flow passage of molten metal by integrally molding the fixed-side mold 120 or by inserting a separately machined part in the form of a bushing 61 into the fixed-side mold 120 .

The sprue 60 is preferably formed to be narrower than the cross-sectional area of the sleeve 1. This is because, when the same pressure is applied, the smaller the cross-sectional area, the larger the speed can be obtained. That is, when the molten metal is passed through the sprue 60 by the pressurization of the pressurizing means 10, the molten metal is filled at a rate larger than the melt speed in the sleeve 1, and the entire cross- So that air can not be mixed.

According to the above-described structure, the structure of the "runner", which is a structure of a narrow passage and connected to the cavity, has been removed.

On the other hand, the moving plate 52 is formed with a round through-hole 55, so that the molten metal can be supplied into or cut off from the mold cavity according to the position of the through-hole 55. That is, when the through hole 55 comes in a position aligned with the sleeve 1 and the sprue 60, the molten metal in the sleeve 1 receives the pressure of the pressing means 10, It is possible to supply the molten metal to the cavity 31 of the mold through the sprue 60. When the through hole 55 is completely disengaged from the aligned position, the passage of the tip of the sleeve 1 is blocked to supply the molten metal to the cavity 31 .

4 and 5 are cross-sectional views showing another embodiment of the present invention. When it is not possible to directly form the sprue 60 forming the flow path of the molten metal in the cavity 31 of the mold, (60) close to the mold cavity and at a position most suitable for casting the product

3 shows that the sprue 60 is formed directly in contact with the cavity 31, but Fig. 4 does not directly contact the cavity 31 but a little distance. As shown in FIG. 4, the sprue 60 is formed just under the cavity 31 forming position. In this case, it is preferable that the structure of the moving-side mold 130 is provided with protrusions 63 to make the space of the sprue 60 slightly narrower. The injecting part 64 is narrowly formed at a distance between the sprue 60 and the cavity 31 so that the molten metal is injected into the cavity 31 through the injection part 64 of the narrow passage.

The reason for providing the shape of the injection part 64 and the protrusion 63 of the narrow passage as described above is that the pressurization by the pressurizing means 10 causes the sleeve 1 to have a large cross- The flow passage of the molten metal becomes narrower due to the configuration of the projecting portion 63, so that the filling rate of the molten metal becomes faster. Since the molten metal having a high filling speed is sufficiently filled up to every corner of the cavity 31, dense filling is performed without creating an unfilled space such as an empty space or a pin hole in the cavity.

In addition, since the injection part 64 has a minimum length and its passage is narrow, material loss is minimized when parts other than the product shape are removed after the product is formed and after the product is formed.

The operational relationship according to the above configuration will be briefly described again

During the die casting operation, the molten metal is first injected into the sleeve 1 through the sprue 3 of the sleeve 1. In this case, the opening / closing device 50 keeps the state in which the distal end portion of the sleeve 1 is closed.

When the molten metal is sufficiently filled in the sleeve 1, the plunger 11 is operated to push out the molten metal. At this time, the opening / closing device 50 is operated so that the through hole 55 formed in the moving plate 52 is positioned to coincide with the end surface of the sleeve 1, so that the molten metal can be injected toward the cavity 31.

In this case, when the molten metal reaches the sprue 60, the cross-sectional area becomes narrower, so that the charging speed becomes faster. When the molten metal is filled in the cavity 31, the molten metal is densely filled without an empty space. Further, since the molten metal is pushed in from the sleeve 1 in a state where the molten metal is sufficiently filled, there is no mixing of air

According to the present invention, pinholes that may occur during the process of cooling a die-cast product are extremely rare because of the fact that the molten metal is densely injected into the cavity 31

According to the present invention, the molten metal may not be sufficiently filled in the process or the end of the plunger 11. In this case, the molten metal can be prevented from entering the molten metal by operating the moving plate 52, And consequently it has a preventive effect to prevent mass production of the product in advance.

1 sleeve 10 pressure means
11 Plunger 12 cylinders
20, 120 Fixed-side mold 30, 130 Moving-side mold
31 cavity 50 opening and closing device
51 Fixing device 53 Drive device
55 through hole 60 spruce
61 bushing 63 protrusion
64 Injection section.

Claims (7)

The sleeve 1 is provided with the pressing means 10 to inject the molten metal into the cavity through the sleeve so as to form the cavity shape 1. A die casting apparatus for producing a product in the form of a die,
Wherein the fixed die (120) is provided with an opening / closing device (50) capable of blocking the passage of the sleeve (1). The method according to claim 1,
Characterized in that the opening / closing device (50) comprises a driving device (53) composed of a cylinder and a rod, and a moving plate (52) is provided at the tip of the rod 3. The method of claim 2,
Wherein the moving plate 52 is formed with a through hole 55 so that the molten metal is injected or blocked through the through hole 55 in accordance with the forward and backward movement of the moving plate 52. [ The method according to claim 1,
And a sprue (60) communicating with the cavity is formed in the fixed-side mold (120). The method according to claim 1 or 4,
And a bushing (61) communicating with the cavity is provided in the fixed-side mold (120). The method according to claim 1,
The protruding portion 63 is formed in the sprue 60 passageway formed in the fixed-side mold 120. The protruding portion 63 is formed in the movable-side mold 130, . The method according to claim 6,
The fixed side mold 120 is formed with a molten metal injection portion 64 communicating with the cavity and the molten metal injection portion 64 is configured to communicate with the sprue 60 formed in the fixed side mold 120 Die casting device.

Images