KR200453764Y1 - Hot chamber die casting machine - Google Patents

Abstract

The present invention relates to a high temperature chamber die casting machine for casting molten metal at a high pressure into a mold.

The present invention implements a double sealing structure by securing a sufficient sealing surface by improving the shape of the gooseneck, thereby improving the sealing property inside the dissolution tank, thereby producing a high-quality high-quality product, while the mounting portion of the gooseneck It is possible to easily remove gooseneck during repair and replacement by improving the structure of the thermal expansion, thereby providing a high temperature chamber die casting machine that can improve workability during gooseneck repair and replacement. .

High Temperature Chamber, Die Casting Machine, Gooseneck, Double Seal Structure, Sealability, Workability

Description

Hot chamber die casting machine

The present invention relates to a high-temperature chamber die casting machine for injecting molten metal into a mold at high pressure, and more particularly, to improve sealing and workability by improving the structure and shape of a goose neck for injecting molten metal. It is related with the high temperature chamber die casting machine which can aim at.

In general, a manufacturing apparatus by a die casting casting method is classified into a low temperature chamber die casting apparatus and a high temperature chamber die casting apparatus according to a method in which molten metal dissolved by a melting tank is transferred to a mold.

In general, a low temperature chamber die casting method is a method of transferring molten metal dissolved by a dissolution tank to a plunger in a pressurized chamber in the form of being exposed to the atmosphere and injecting molten metal into a mold.

In the low temperature chamber die casting method, since molten metal is transferred to the pressurizing chamber in the form of being exposed to the atmosphere, the atmospheric exposure area of the molten metal is wide and there is a disadvantage that it is not easy to manufacture a high quality product due to inflow of air when pressurizing the pressurizing chamber.

The high temperature chamber die-casting method to compensate for this drawback is a casting method in which molten metal is directly pressurized to a die fixed to the die by directly pressurizing the molten metal to a pressure higher than atmospheric pressure. How to mold.

That is, the high temperature chamber die casting method is a method of manufacturing a molten metal pressurized by a pressurizing device by pressurizing the molten metal dissolved by a dissolution tank into a mold through a nozzle.

At this time, the transport path of the molten metal is pressurized in the pressure chamber inside the melting tank to go through the gooseneck to the nozzle, and is pressed back into the cavity of the mold from the nozzle.

This manufacturing method has the advantage that the bubble defect of the product is less than the low-temperature chamber die casting apparatus because the molten metal is pressed into the mold without being exposed to the atmosphere.

In addition, since it can be hermetically cast without being exposed to the atmosphere, it is particularly advantageous for manufacturing a product of a material which is rapidly oxidized in the atmosphere such as magnesium.

Looking at the operation relationship of the conventional high temperature chamber die casting machine as follows.

A movable mold and a stationary mold, which are driven by a press equipment and merged with each other to form a cavity, are provided, and a die casting machine for injecting molten metal into the cavity from the bottom of the stationary mold is provided.

First, the clamping is completed while the movable mold and the fixed mold form a cavity by driving the movable mold by press operation.

Next, the die casting machine is driven to push down the plunger, and by this pushing force, the molten metal melted in the melting furnace is pressed into the cavity through the nozzle through the gooseneck and filled.

After the cooling, the mold is opened and the die casting product is taken out from the mold to complete the process.

The molten metal of the magnesium alloy used in such a high temperature chamber die casting method is rapidly oxidized when exposed to the atmosphere. In this case, since the molten metal is solidified in the MgO oxide layer, the molten metal inside the melting tank including the gooseneck is not exposed to the atmosphere. It is very important that it is completely sealed.

Complementarily, a shielding fluid, such as SF6, is formed on the molten metal surface layer of the magnesium alloy in the melting tank to form a barrier between the casting medium and the outside air.

As such, it is very important that the high temperature chamber die casting machine using the molten metal of the magnesium alloy does not introduce external air into the dissolution tank, but conventionally, there is a problem in that the sealing is not effectively made due to the gooseneck structural characteristics.

In addition, since the magnesium alloy has a melting temperature of about 650 to 700 ° C., the gooseneck which transfers the molten metal of the melting tank to the mold becomes bulky due to thermal expansion, which causes the gooseneck from the gooseneck accommodation part to be repaired and replaced. It is very difficult to remove.

Therefore, the present invention has been devised in view of such a point, and by implementing a double sealing structure by securing a sufficient sealing surface by improving the shape of the gooseneck, it is possible to improve the sealing property inside the dissolution tank, and accordingly high quality It is an object of the present invention to provide a high temperature chamber die casting machine capable of manufacturing a product.

In addition, another object of the present invention is to improve the structure of the mounting portion of the gooseneck to effectively accommodate it during thermal expansion, it is possible to easily remove the gooseneck during repair and replacement, accordingly workability during gooseneck repair and replacement It is to provide a high temperature chamber die casting machine that can improve the.

In order to achieve the above object, the high-temperature chamber die-casting machine provided in the present invention is a dissolution tank containing molten metal, a goose neck installed in the dissolution tank for transferring molten metal to a cavity of a mold, and installed in the gooseneck to pressurize the molten metal. And a plunger, a cylinder for operating the plunger, a dissolution tank and a machine body for installing the cylinder, and the cover of the dissolution tank, through which the gooseneck is installed, is formed by stacking at least two sealing covers stacked up and down. It is made so that the circumference of the cover seat surface of the gooseneck can be completely sealed with a double sealing structure.

Here, it is preferable that the cover seat surface of the gooseneck is formed to have a wider upper and lower width than the thickness of at least two sealing covers to secure an area capable of sufficiently extinguishing the double sealing structure.

In addition, it is preferable that any one of the gooseneck mounting surfaces of the gooseneck is formed as a surface inclined at an angle from the rear to the front so that it can be easily removed even when the volume is increased by thermal expansion during repair and replacement. Do.

The high temperature chamber die casting machine provided by the present invention has the following advantages.

First, the cover seat surface of the gooseneck that is attached to the cover of the dissolution tank is provided with a sufficient width to double the sealing, it is possible to completely seal the inside of the dissolution tank, thereby manufacturing a high-precision and high-quality products.

Second, since one side of the upper part of the gooseneck mounted on the gooseneck receiving part is inclined, it can be easily removed even if the volume increases due to thermal expansion by hot molten metal, thereby improving workability related to the gooseneck repair and replacement. have.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 are a perspective view, a plan view and a cross-sectional view showing a gooseneck of a high temperature chamber die casting machine according to an embodiment of the present invention.

As shown in Figs. 1 to 3, the gooseneck 11 has a substantially cylindrical shape and is a means for transferring the molten metal filled in the dissolution tank 10 to the cavity of the mold.

Inside the gooseneck 11, the space 22 for installing the plunger is formed side by side along the axis line, and the inlet 20 is formed in communication with the interior of the dissolution tank 10 to receive the molten metal on one side. On the other side, a discharge port 21 for discharging the molten metal introduced into the space 22 into the cavity of the mold is formed.

Accordingly, the molten metal in the dissolution tank 10 may be supplied to the cavity of the mold via the inlet 20 → the space 22 → the outlet 21 in association with the operation of the plunger.

In particular, the gooseneck 11 is installed in the form of vertically penetrating the dissolution tank cover 15 when installed in the dissolution tank 10, the periphery of the through portion is sealed in a double sealing structure, corresponding to this double sealing structure In order to achieve this, the gooseneck 11 has a sealing surface with a sufficient area.

For example, the gooseneck 11 is provided with a cover seat surface 17 whose entire circumference is in contact with the cover 15, and at least two sealings whose upper and lower widths H of the cover seat surface 17 at this time are described later. Since the cover is formed to be relatively wider than the thickness of the cover, that is, the upper and lower widths of the cover seat surface 17 are secured to be wider than the upper and lower widths of the combined thicknesses of the two sealing covers, thereby effectively coping with the double sealing structure.

In addition, the gooseneck 11 has a shape capable of accommodating a portion in which volume due to thermal expansion is increased.

To this end, both gooseneck mounting surfaces 19 of the gooseneck 11, for example, both sides of the flat portion mounted on the gooseneck receiving portion 24 formed on the post plate 19 of the machine body 14, respectively. One side of the gooseneck mounting surface 18 is formed in the inclined surface at an angle (α) toward the front from the rear.

That is, when viewed from the top view, the gooseneck body is formed in a shape inclined inward toward the front toward the front.

Accordingly, the gooseneck body is inevitably increased in volume as it is exposed to a high temperature melting furnace, so that the inclined shape can roughly cover the increased volume at this time, that is, when the gooseneck is inclined Since a gap is formed between the gooseneck accommodation portion 24 and the space is increased to accommodate the portion, the gooseneck mounting portion 19 due to thermal expansion can prevent the gooseneck accommodation portion 19 from being tightly stuck to the gooseneck accommodation portion 24, and eventually The gooseneck 11 can be easily removed during repair or replacement.

Here, it is preferable to form the inclination angle (alpha) at 2-5 degrees in consideration of the thermal expansion coefficient of the gooseneck by the temperature of 650-700 degreeC environment inside a dissolution tank.

4 and 5 are a cross-sectional view and an enlarged view showing the installation state of the gooseneck in the high-temperature chamber die casting machine according to an embodiment of the present invention.

As shown in FIGS. 4 and 5, the dissolution tank 10 in which the molten metal is accommodated is installed inside the machine main body 14, and is vertically supported on the post plate 19 on the upper part of the machine main body 14. A cylinder 13 installed in a structure is disposed, and a gooseneck 11 including a plunger 12 is installed inside the dissolution tank 10.

Here, the plunger 12 is connected to the rod of the cylinder 13 and acts up and down during operation of the cylinder to adjust the pressure for introducing or discharging the molten metal into the gooseneck, the cylinder and the plunger at this time Since the process of supplying the molten metal to the cavity of the mold by interlocking between them is the same as before, a detailed description thereof will be omitted.

The gooseneck 11 is a means for transferring the molten metal filled in the dissolution tank to the cavity of the mold, and the gooseneck 11 is provided in the gooseneck accommodating portion 24 having a stepped structure provided in the post plate 19 of the machine body 14. Using the gooseneck mounting surface 18 is installed in a structure that is seated.

The gooseneck 11 installed as described above is disposed inside the dissolution tank while penetrating the cover 10 of the dissolution tank 10, and a sealing structure is formed at a portion through which the gooseneck 11 penetrates.

In order to seal the gooseneck 11, the cover 10 is formed by combining two sealing covers 16a and 16b stacked up and down, and the sealing covers 16a and 16b at this time are goosenecks ( 11) the cover seat surface 17 of the upper and lower contact with the double serves to seal.

As shown in FIG. 6, the sealing covers 16a and 16b have a space in which a gooseneck body is located at the center, and is formed by combining two cover members formed in a semicircle into one circle shape. .

Accordingly, the semicircular cover members on both sides of the gooseneck 11 are arranged in a circle shape during installation, so that the periphery of the cover seat of the gooseneck 11 can be completely sealed.

Here, the O-ring 23 is interposed between the sealing covers 16a and 16b and the cover seat surface 17 to further improve the sealing performance.

In addition, one of the two sealing covers 16a and 16b stacked up and down may have a smaller diameter than the other one of the sealing covers 16b disposed downward. have.

As such, since the circumference of the gooseneck 11 is sealed by the double sealing structure by the two sealing covers 16a and 16b, it is possible to prevent the external air from flowing into the inside of the dissolution tank 10, which is excellent. As the sealing performance of the dissolution tank can be secured, a high quality product can be manufactured.

Therefore, the casting process of the die casting product by the high temperature chamber die casting machine configured as described above is as follows.

First, the movable mold is moved toward the stationary mold to be contacted at a predetermined pressure, and the clamping process is completed.

Next, when the cylinder 13 is driven and the plunger 12 moves downward, the molten metal inside the gooseneck is discharged to the discharge port 21 by the force, and is pressed and filled into the cavity in the mold through a nozzle (not shown).

After the filling, the flanger 12 returns, and after a predetermined time passes, when the molten metal that has been filled in the cavity in the mold solidifies and becomes a die casting product, the die casting product casting process is completed when the product is taken out together with the mold opening.

At this time, since the inside of the dissolution tank 10 is sealed by the double sealing structure between the gooseneck 11, the inflow of the outside air is completely blocked, and thus, the surface of the dissolution tank 10 can be cast with a clean and dense quality die casting product. .

In addition, when removing the gooseneck for repairing or replacing the gooseneck, even if the gooseneck is thermally expanded due to the high temperature conditions in the melting tank to increase the volume, the gooseneck mounting surface of the inclined form does not get stuck in the gooseneck receiving portion, Therefore, the neck can be removed easily and quickly without effort and without waiting for a long time to cool down.

1 is a perspective view showing a gooseneck of a high temperature chamber die casting machine according to an embodiment of the present invention

2 is a plan view showing a gooseneck of a high temperature chamber die casting machine according to an embodiment of the present invention;

3 is a cross-sectional view taken along the line A-A of FIG.

Figure 4 is a cross-sectional view showing the installation state of the gooseneck in a high-temperature chamber die casting machine according to an embodiment of the present invention

5 is an enlarged view of a portion “B” of FIG. 4;

6 is a plan view showing a dissolution tank cover formed of a combination of two sealing covers in a high temperature chamber die casting machine according to an embodiment of the present invention;

<Description of the symbols for the main parts of the drawings>

10: dissolution tank 11: gooseneck

12 plunger 13 cylinder

14 machine body 15 cover

16a, 16b: sealing cover 17: cover seat

18: gooseneck through 19: post plate

20: inlet 21: outlet

22: space 23: O-ring

24: gooseneck accommodation

Claims (6)

In a high temperature chamber die casting machine, A dissolution tank 10 in which molten metal is accommodated, a gooseneck 11 installed in the dissolution tank 10 for transferring molten metal to a cavity of a mold, and a plunger installed in the gooseneck 11 to pressurize the molten metal; (12), a cylinder (13) for operation of the plunger (12), and a machine body (14) for installation of the dissolution tank (10) and the cylinder (13), The cover 15 of the dissolution tank 10 through which the gooseneck 11 is installed has a shape in which at least two sealing covers 16a and 16b are laminated and combined to form a cover seat surface 17 of the gooseneck 11. ) Is sealed with a double sealing structure, The mounting surface of any one of the gooseneck mounting surfaces 18 on both sides of the gooseneck 11 mounted on the gooseneck receiver 24 provided in the machine main body 14 is inclined at a predetermined angle from the rear to the front. High temperature die casting machine. 2. The high temperature chamber die casting machine according to claim 1, wherein the cover seat surface 17 of the gooseneck 11 has a relatively wider upper and lower width than a thickness of at least two sealing covers 16a and 16b. . The high temperature chamber die casting machine according to claim 1 or 2, wherein the sealing covers (16a, 16b) are formed by combining two semicircular cover members into one circle with a gooseneck in the center. 3. The high temperature chamber die casting machine according to claim 1 or 2, wherein one of said sealing covers (16a) and (16b) has a smaller diameter than the other. delete 2. The high temperature chamber die casting machine according to claim 1, wherein an inclination angle of the inclined surface of the gooseneck is 3 to 5 °.

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