KR102617536B1 - Melting furnace-Holding furance Integrated Type Casting Apparatus Using Pressure - Google Patents

Abstract

The present invention provides a melting furnace-thermal furnace integrated pressure casting device that allows the molten metal from the melting furnace to be supplied to the cavity of the mold in a sealed state without being exposed to the outside, thereby obtaining high-quality molded products. The melting furnace-thermal furnace integrated pressure casting device of the present invention includes a thermal insulation furnace that maintains molten metal in a molten state and is formed with an extrusion port for supplying the molten metal on one side, and is disposed on one side of the thermal insulation furnace and communicates with the extrusion port. A mold with a cavity provided inside, a melting furnace for melting molten metal supplied from the outside and supplying the molten metal to the thermal insulation furnace through a molten metal supply pipe in communication with the thermal insulation furnace, and pressurizing the molten metal in the thermal insulation furnace. It includes a pressurizing means for supplying molten metal into the cavity of the mold through the extrusion port.

Description

Melting furnace-Holding furance Integrated Type Casting Apparatus Using Pressure}

The present invention relates to a melting furnace-thermal furnace integrated pressure casting device. In detail, it relates to a pressure casting device integrated with a melting furnace and an insulating furnace that can prevent defects in molded products and the creation of bubbles in molded products due to molten metal being exposed to the outside.

A pressure casting device is a device that pressurizes molten metal maintained in a molten state in a melting furnace, injects it into the cavity of a mold, and solidifies it to obtain a molded product of a predetermined shape. In a general pressure casting device, as disclosed in Patent Document 1, a melting furnace for melting molten metal and maintaining it in a molten state and a mold are formed separately, a sleeve communicating with the mold is provided, the molten metal from the melting furnace is scooped up and poured into the sleeve, and the sleeve is The molten metal in the sleeve is pushed into the mold using a plunger that moves inside, thereby injecting the molten metal into the cavity of the mold.

Since the pressure casting device of Patent Document 1 pours molten metal, an injection hole must be formed in the sleeve, and the molten metal in the sleeve is exposed to the outside through the injection hole. As a result, bubbles may form in the molten metal injected into the mold, and it may be partially oxidized or partially solidified. If these bubbles, oxides, and solidifications are molded without being filtered out, defects may occur in the molded product.

In order to prevent this, a pressure casting device was proposed that provides a melting furnace in a closed chamber as shown in Patent Document 2 and supplies the molten metal to the cavity of the mold by pressurizing the molten metal in the melting furnace with a plunger.

However, the pressure casting device disclosed in Patent Document 2 supplies molten metal material in the shape of a wire or piece into the melting furnace to replenish the molten metal and melts it within the melting furnace. At this time, the molten metal in the melting furnace is released to the outside through the supply port for supplying the molten metal material. The possibility of exposure cannot be ruled out, and if the molten metal is pressurized, there is a possibility that the molten metal may leak out through the supply port. If the molten metal in the melting furnace is exposed to the outside, defects in the molded product may occur due to bubbles, oxides, and solidification, as seen previously.

Patent Document 1: Korean Patent Publication No. 10-2014-0069835 Patent Document 2: Korean Patent Publication No. 10-2012-0005656

The present invention is intended to solve the problems of the prior art discussed above, and is a melting furnace-thermal furnace integrated pressurization method that allows the molten metal from the melting furnace to be supplied to the cavity of the mold in a sealed state without being exposed to the outside, thereby obtaining high-quality molded products. The purpose is to provide a casting device.

In order to achieve the above object, the melting furnace-thermal furnace integrated pressure casting device of the present invention includes a thermal insulation furnace that maintains the molten metal in a molten state and is formed with an extrusion port for supplying the molten metal to one side, and one side of the thermal insulation furnace. a mold disposed in a mold having a cavity in communication with the extrusion port therein, melting a molten metal material supplied from the outside, and supplying the molten metal to the insulating furnace through a molten metal supply pipe in communication with the insulating furnace. It includes a melting furnace and a pressurizing means for pressurizing the molten metal in the thermal insulation furnace and supplying the molten metal into the cavity of the mold through the extrusion port, wherein the thermal insulation furnace and the melting furnace are integrally connected via the molten metal supply pipe, While the molten metal in the melting furnace is supplied to the thermal insulation furnace through the molten metal supply pipe, it is maintained blocked from the outside.

According to the melting furnace-thermal insulation furnace integrated pressure casting device according to the present invention having the above configuration, the molten metal material supplied from the outside is melted in the melting furnace and the molten metal is supplied to the thermal insulation furnace through the molten metal supply pipe, so that the molten metal is supplied to the thermal insulation furnace. While supplying, the molten metal in the thermal insulation furnace can be maintained in a closed state (sealed state) from the outside. Therefore, the present invention prevents the molten metal in the thermal insulation furnace from being exposed to the outside and being oxidized or partially solidified, and prevents bubbles from forming when the molten metal is filled into the mold, thereby making it possible to obtain a high-quality molded product.

1 is a diagram showing the configuration of a melting furnace-heating furnace integrated pressure casting device according to the first embodiment of the present invention.
Figure 2 is a diagram showing a state before casting in the melting furnace-thermal furnace integrated pressure casting apparatus according to the first embodiment of the present invention.
Figure 3 is a diagram showing the state when casting is performed in the melting furnace-thermal furnace integrated pressure casting apparatus according to the first embodiment of the present invention.
Figure 4 is a diagram showing the configuration of a melting furnace-heating furnace integrated pressure casting device according to the second embodiment of the present invention.
Figure 5 is a diagram showing a state before casting in the melting furnace-thermal furnace integrated pressure casting apparatus according to the second embodiment of the present invention.
Figure 6 is a diagram showing the state when casting is performed in the melting furnace-thermal insulation furnace integrated pressure casting apparatus according to the second embodiment of the present invention.
Figure 7 is a diagram showing a state before casting in the melting furnace-thermal furnace integrated pressure casting apparatus according to the third embodiment of the present invention.
Figure 8 is a diagram showing the state when casting is performed in the melting furnace-heating furnace integrated pressure casting apparatus according to the third embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the attached drawings. The drawings illustrate each configuration in cross section for convenience of explanation.

<First embodiment>

As shown in FIG. 1, the melting furnace-thermal furnace integrated pressure casting device 10 according to the first embodiment of the present invention includes a thermal insulation furnace 100 for maintaining molten metal in a molten state, and molten metal is supplied to enable casting. It is equipped with a mold 200 for melting the molten metal material M supplied from the outside and a melting furnace 300 for melting the molten metal material M supplied from the outside. The warming furnace 100 and the melting furnace 300 are connected through a molten metal supply pipe 320. In addition, the warming furnace 100 and the melting furnace 300 are disposed within the housing 1100, and the mold 200 is surrounded by a chamber 400 disposed and connected to the housing 1100.

The thermal insulation furnace 100 has a substantially cylindrical shape and has an internal space 100S filled with molten metal. The internal space 100S has a volume larger than the molten metal that can fill the cavity 210 of the mold 200, which will be described later.

A first heating means 110 for heating the thermal insulation furnace 100 is disposed outside the thermal insulation furnace 100. The first heating means 110 may be an induction heating device or an electric heater that generates heat using electrical energy supplied from an external power source. The thermal insulation furnace 100 is heated by the first heating means 110 and maintained at a predetermined temperature, and the molten metal in the internal space 100S is maintained in a molten state.

In addition, a tapping opening 130 that communicates with the outside is provided at the lower part of the insulating furnace 100, and when casting is not performed, the insulating furnace 100 (and the melting furnace 300 in communication therewith) is provided through the tapping opening 130. The molten metal inside is discharged to the outside. The tapping port 130 is blocked with a stopper or the like during casting. The tapping opening 130 extends laterally from the lower part of the insulating furnace 100, but may extend longitudinally from the bottom of the insulating furnace 100 to communicate with the outside.

The inside of the housing 1100 is filled with an insulating material. Accordingly, the first heating means 110 is surrounded by an insulating material, and the insulating material prevents the heat heated by the first heating means 110 from escaping to the outside.

A mold 200 in which casting is performed is mounted on one side (upper side in FIG. 1) of the thermal insulation furnace 100. The mold 200 is placed in the chamber 400 as described above.

A cavity 210 is formed inside the mold 200 by fastening the upper mold 220 and the lower mold 230. An extrusion hole 231 is formed in the lower mold 230 to communicate with the cavity 210 and the thermal insulation furnace 100. Additionally, an extrusion hole 120 is formed in the thermal insulation furnace 100 to communicate with the extrusion hole 231 of the lower mold 230. The molten metal in the thermal insulation furnace 100 is supplied into the cavity 210 of the mold 200 through the extrusion port 120 and the extrusion hole 231 to fill the cavity 210.

Additionally, an air vent 221 communicating with the cavity 210 is formed in the mold 200. The mold 200 is disposed at a distance from the chamber 400, and the chamber 400 surrounding the mold 200 is connected to the first pressure reducing means 500. The first decompression means 500 includes a decompression pipe 510 connected to the chamber 400, a decompression tank 520 connected to the decompression pipe 510, and a device for sucking gas from the decompression tank 520 and withdrawing it to the outside. It is equipped with a pressure reducing pump (not shown). Additionally, the pressure reduction pipe 510 is provided with a valve 511 that opens and closes the pressure reduction pipe 510.

Additionally, the pressure reduction tank 520 may be maintained in a reduced pressure state by a pressure reduction pump not shown in FIG. 1 . When the pressure reduction tank 520 is maintained in a reduced pressure state (i.e., a vacuum state), the gas existing between the chamber 400 and the mold 200 and the gas existing in the cavity 210 through the air vent 221 (external (including air and gas generated during melting of the molten metal material (M)) escapes to the pressure reduction tank 520.

Therefore, in the first embodiment, the gas existing between the mold 200 and the chamber 400 and the gas existing in the cavity 210 of the mold 200 and the thermal insulation furnace 100 are reduced by the first decompression means 500. can be removed, preventing the molten metal in the thermal insulation furnace 100 from being oxidized or partially solidified, and also, since the inside of the mold 200 is maintained in a vacuum state, air bubbles within the molten metal are prevented while the molten metal is being filled into the mold 200. can be prevented from occurring.

Meanwhile, the gas existing in the cavity 210 is at a high temperature because it is exposed to the molten metal of the thermal insulation furnace 100. The pressure reduction pipe 510 is provided with a cooling means 530 for cooling the high-temperature gas exiting through the pressure reduction pipe 510. The cooling means 530 may be a coil-shaped pipe surrounding the pressure-reducing pipe 510, as shown in FIG. 1, and the fluid cooled by a typical refrigeration device flows through this coil-shaped pipe to reduce the pressure-reducing pipe 510. It is cooled by heat exchange with the high temperature gas flowing through it.

The melting furnace 300 has an internal space 300S for accommodating and melting the molten metal material M supplied from the outside. The molten metal material (M) is in the form of small pieces such as pellets made of metal.

A second heating means 310 is provided outside the melting furnace 300. The second heating means 310 may be an induction heating device or an electric heater that generates heat by receiving electrical energy from an external power source, and the molten metal material M contained in the internal space 300S is heated by the generated heat. It is melted to become molten metal in a molten state. The melting furnace 300 is disposed within the housing 1100 as previously described. The outside of the melting furnace 300 is wrapped with an insulating material. The insulation material prevents heat from the heated melting furnace 300 from escaping to the outside.

The molten metal in the melting furnace 300 is supplied to the thermal insulation furnace 100 through the molten metal supply pipe 320. In addition, the molten metal supply pipe 320 is provided with a third heating means 321 surrounding the molten metal supply pipe 320. The third heating means 321 may be an induction heating device or an electric heater that receives electrical energy from an external power source to heat the molten metal supply pipe 320, and maintains the molten metal flowing through the molten metal supply pipe 320 in a molten state.

In the melting furnace-thermal insulation furnace integrated pressure casting device 10 of the first embodiment, the molten metal material M is not directly supplied to the thermal insulation furnace 100, but is melted in the melting furnace 300 to become molten metal, and then the molten metal is It is supplied to the thermal insulation furnace 100 through the supply pipe 320. As a result, the connection portion between the thermal insulation furnace 100 and the molten metal supply pipe 320 is maintained in a liquid-tight state in which it is filled with molten metal and sealed. As a result, while molten metal is supplied to the thermal insulation furnace 100, the molten metal in the thermal insulation furnace 100 is blocked from the outside and is not exposed to the outside. That is, in the first embodiment, in the conventional pressure casting apparatus, the molten metal material (M) in the form of pieces is directly supplied to the melting furnace, so a liquid-tight state cannot be created, and the molten metal in the melting furnace is exposed to the outside and oxidized or partially solidified. It is possible to solve the problem of molten metal leaking when pressurized, and the problem of bubbles being generated when filling molten metal into a mold.

The melting furnace 300 is connected to a supply tank 600 that stores the molten metal material (M). The supply container 600 is provided with a cover 610. An opening and closing member 620 is provided at the lower part of the supply container 600 to open and close the connection pipe between the supply container 600 and the melting furnace 300. The opening and closing member 620 may have a mesh structure, and in this case, the size of the unit mesh may be such that the molten metal material M does not pass through. The user can open the cover 610 and put the rod-shaped molten metal material (M) into the supply tank 600, and open the opening and closing member 620 to supply the molten metal material (M) to the melting furnace 300.

Additionally, when supplying the molten metal material (M), a material capable of deoxidizing, for example, powder or small pieces made of carbon, can be added together. In this case, the supplied carbon can absorb oxygen while being burned in the melting furnace 300 and remove oxygen in the melting furnace 300. Therefore, it is possible to prevent the molten metal in the melting furnace 300 from being oxidized.

In the first embodiment, the connection pipe 630 between the supply tank 600 and the melting furnace 300 is in communication with the second pressure reducing means 700 and the pressurizing means 800. The second decompression means 700 includes a decompression pipe 710 in communication with the connection pipe 630, a decompression tank 720 connected to the decompression pipe 710, and suction of gas from the decompression tank 720 to the outside. It is equipped with a pressure reducing pump (not shown) to remove it. Additionally, the pressure reduction pipe 710 is provided with a valve 711 that opens and closes the pressure reduction pipe 710.

Additionally, the pressure reduction tank 720 may be maintained in a reduced pressure state by a pressure reduction pump not shown in FIG. 1 . When the pressure reduction tank 720 is in a reduced pressure state (i.e., a vacuum state), the gas present in the supply tank 600 and the melting furnace 300 connected to the supply tank 600 (entered together with the input of the molten metal material M) Air and the gas generated when the molten metal material (M) is melted) escape into the pressure reduction tank 520.

Therefore, in the first embodiment, the gas present in the supply tank 600 and the melting furnace 300 is removed by the second pressure reducing means 700 to prevent the molten metal in the melting furnace 300 from being oxidized or partially solidified.

Meanwhile, the gas existing in the melting furnace 300 is at a high temperature because it is exposed to the molten metal of the melting furnace 300. The pressure reduction pipe 720 is provided with a cooling means 730 for cooling the high-temperature gas exiting through the pressure reduction pipe 720. The cooling means 730 may be a coil-shaped pipe surrounding the pressure-reducing pipe 720, as shown in FIG. 1, and the fluid cooled by a typical refrigeration device flows through the coil-shaped pipe to reduce the pressure-reducing pipe 720. The high-temperature gas is cooled by heat exchange with the flowing high-temperature gas.

The pressurization means 800 includes a pressurization pipe 810 in communication with the connection pipe 630, a pressurization tank 820 connected to the pressurization pipe 810, and a device for pressurizing the pressurization tank 820 by supplying gas from the outside. It is equipped with a pressurization pump (not shown). The pressurization pipe 810 is provided with a valve 811 that opens and closes the pressurization pipe 810. The pressurized tank 820 is filled with an inert gas such as nitrogen or argon.

When the pressurization tank 820 is put into a pressurized state (i.e., in a high pressure state) by operating the pressurization pump and supplying an inert gas to the inside of the pressurization tank 820, the connection pipe 630 is connected to the connection pipe 630. The pressure within the melting furnace 300 increases, and the molten metal from the melting furnace 300 is supplied to the thermal insulation furnace 100. As a result, the pressure within the thermal insulation furnace 100 increases and the molten metal within the thermal insulation furnace 100 is injected into the cavity 210 of the mold 200. At this time, the gas in contact with the molten metal in the melting furnace 300 is an inert gas, so the molten metal in the melting furnace 300 is not oxidized or solidified.

Hereinafter, the operation of the melting furnace-heating furnace integrated pressure casting device 10 of the first embodiment will be described with reference to FIGS. 2 and 3.

As shown in FIG. 2, the molten metal material M is supplied to the supply tank 600 and the melting furnace 300 is heated by the second heating means 310 to be in a molten state in the internal space 300S of the melting furnace 300. produces molten metal. The generated molten metal is filled into the internal space 100S of the thermal insulation furnace 100 through the molten metal supply pipe 320. At this time, the first heating means 110 and the third heating means 321 are operated to maintain the molten metal in the thermal insulation furnace 100 and the molten metal supply pipe 320 in a molten state. The molten metal fills the internal space 100S of the thermal insulation furnace 100 and is prevented from flowing into the cavity 210 of the mold 210.

At the same time, the pressure reduction pump of the first pressure reduction means 500 is operated to remove the upper portion of the molten metal, the space between the mold 200 and the chamber 400, and the mold 200 in the internal space 100S of the thermal insulation furnace 100. The gas (including external air and gas generated during melting of the molten metal material M) present in the cavity 210 is sucked in and discharged to the outside, and the valve 511 is closed to maintain a reduced pressure state. In addition, by operating the pressure reduction pump of the second pressure reduction means 700, the upper part of the molten metal and the gas in the supply tank 600 (when the external air and the molten metal material M) are melted in the internal space 300S of the melting furnace 300 The gas (including generated gas) is sucked in and discharged to the outside, and the valve 711 is closed to maintain the reduced pressure. Meanwhile, at this time, the valve 811 of the pressurizing means 800 is closed. For this reason, in the melting furnace-heating furnace integrated pressure casting device 10 of the first embodiment, all gases in spaces other than the molten metal are discharged to the outside.

Meanwhile, since the mold 200 and the melting furnace 300 are depressurized together, the interior of the mold 200 and the interior of the melting furnace 300 maintain pressure parallel, so the molten metal in the thermal insulation furnace 100 is transferred to the mold due to the pressure difference. It is possible to prevent the inflow into (200).

In this state, the pressure pump of the pressure means 800 shown in FIG. 3 is operated to fill the pressure tank 820 with an inert gas to increase the internal pressure, and then the valve 811 is opened to pressurize to a predetermined pressure. The inert gas in the tank 820 is supplied to the melting furnace 300. The molten metal in the melting furnace 300 is supplied to the thermal insulation furnace 100 by the pressure of the inert gas filled in the upper part of the melting furnace 300, and as a result, the molten metal in the thermal insulation furnace 100 is pressurized and flows through the extrusion port 120. It is filled into the cavity 210 of the mold 200.

As described above, in the melting furnace-thermal furnace integrated pressure casting device 10 of the first embodiment, an inert gas is supplied in a state in which all gases in spaces other than the molten metal are discharged to the outside, thereby pressurizing the molten metal in the thermal insulation furnace 100 to form a mold. (200) Since filling is carried out within the mold, it is possible to obtain a high-quality molded product by preventing the formation of bubbles during the process of filling the molten metal into the mold.

<Second Embodiment>

Hereinafter, with reference to FIGS. 4 to 6, a melting furnace-heating furnace integrated pressure casting device 10A of a second embodiment according to the present invention will be described. For convenience of explanation, the same components as those in the first embodiment are assigned the same reference numerals and descriptions are omitted.

In contrast to the melting furnace-thermal insulation furnace integrated pressure casting device 10 of the first embodiment, the melting furnace-thermal insulation furnace integrated pressure casting device 10A of the second embodiment uses the pressure of an inert gas to maintain heat in the first embodiment. Instead of the pressurizing means 800 for filling the cavity 210 of the mold 200 with the molten metal in the furnace 100, the molten metal in the thermal insulation furnace 100 is pressurized by moving the plunger 910 to fill the cavity 200 with the molten metal in the furnace 100. The difference is that it is provided with a pressurizing means (900) for charging (210).

Specifically, as shown in FIG. 4, the pressurizing means 900 of the melting furnace-insulating furnace integrated pressure casting device 10A of the second embodiment includes a plunger 910 that advances and retreats inward with respect to the insulating furnace 100. and a driving device 920 disposed outside the housing 1100 to drive the plunger 910.

Additionally, the plunger 910 is provided to open and close the molten metal supply pipe 320 connecting the warming furnace 100 and the melting furnace 300 when moving forward or backward. Specifically, the plunger 910 closes the molten metal supply pipe 320 connecting the thermal insulation furnace 100 and the melting furnace 300 by advancing toward the inside of the thermal insulation furnace 100, and retreats from the insulation furnace 100. As a result, it is placed at a position where the molten metal supply pipe 320 is opened.

Hereinafter, with reference to FIGS. 5 and 6, the operation of the melting furnace-heating furnace integrated pressure casting device 10A according to the second embodiment will be described.

First, as shown in FIG. 5, the molten metal material (M) is supplied to the supply tank 600 and the melting furnace 300 is heated by the second heating means 310 to enter the internal space 300S of the melting furnace 300. Creates molten metal. The generated molten metal is filled into the internal space 100S of the thermal insulation furnace 100 through the molten metal supply pipe 320. At this time, the first heating means 110 and the third heating means 321 are operated to maintain the molten metal in the thermal insulation furnace 100 and the molten metal supply pipe 320 in a molten state. The molten metal fills the internal space 100S of the thermal insulation furnace 100 and is maintained without flowing into the cavity 210 of the mold 210.

At the same time, the pressure reducing pump of the first pressure reducing means 500 is operated to remove the upper part of the molten metal, the space between the mold 200 and the chamber 400, and the mold 200 in the internal space 100S of the thermal insulation furnace 100. The gas present in the cavity 210 (including external air and gas generated during melting of the molten metal material M) is sucked in and discharged to the outside, and the valve 511 is closed to maintain a reduced pressure state. In addition, by operating the pressure reduction pump of the second pressure reduction means 700, the upper part of the molten metal and the gas in the supply tank 600 (when the external air and the molten metal material M) are melted in the internal space 300S of the melting furnace 300 The gas (including generated gas) is sucked in and discharged to the outside, and the valve 711 is closed to maintain the reduced pressure. For this reason, in the melting furnace-heating furnace integrated pressure casting device 10 of the second embodiment, all air in spaces other than the molten metal is discharged to the outside.

Meanwhile, since the mold 200 and the melting furnace 300 are depressurized together, the interior of the mold 200 and the interior of the melting furnace 300 maintain pressure parallel, so the molten metal in the thermal insulation furnace 100 is transferred to the mold due to the pressure difference. It is possible to prevent the inflow into (200).

In this state, the driving device 920 of the pressurizing means 900 shown in FIG. 6 is operated to advance the plunger 910 into the thermal insulation furnace 100. As the plunger 910 moves forward, it closes the molten metal supply pipe 320 connecting the thermal insulation furnace 100 and the melting furnace 300, and pressurizes the molten metal in the thermal insulation furnace 100 to release the mold 200 through the extrusion port 120. Molten metal is filled into the cavity 210.

As described above, the melting furnace-heating furnace integrated pressure casting device 10A of the second embodiment is similar to the melting furnace-heating furnace integrated pressure casting device 10 of the first embodiment, and the molten metal material (M ) is not supplied, but is melted in the melting furnace 300 to become molten metal and then supplied to the thermal insulation furnace 100 through the molten metal supply pipe 320, so the molten metal is kept warm while supplying it to the thermal insulation furnace 100. The molten metal in the furnace 100 is blocked from the outside and is not exposed to the outside. Therefore, the problem of the molten metal in the thermal insulation furnace being exposed to the outside and being oxidized or partially solidified due to the thermal insulation furnace not being liquid-tight can be solved.

In addition, in the melting furnace-thermal insulation furnace integrated pressure casting device 10A of the second embodiment, the plunger 910 is advanced into the thermal insulation furnace 100 in a state in which all gases in spaces other than the molten metal are discharged to the outside, thereby removing the mold 200. Since the cavity 210 is filled with molten metal, it is possible to obtain a high-quality molded product by preventing bubbles from forming during the process of filling the molten metal into the mold.

In addition, in the second embodiment, the plunger 910 is moved by the driving device 920, and since there is no change in pressure due to compression and expansion, the amount of movement can be precisely controlled, so that the mold 200 is moved by the advance of the plunger 910. ) can accurately control the amount of molten metal filled into the inside.

And in the second embodiment, the plunger 910 moves forward to close the molten metal supply pipe 320 connecting the warming furnace 100 and the melting furnace 300, and then fills the cavity 210 of the mold 200 with molten metal. , while filling the cavity 210 with molten metal, the molten metal does not flow in through the molten metal supply pipe 320. As a result, while filling the cavity 210 with molten metal, the amount of molten metal in the insulating furnace 100 is maintained constant, and the amount of molten metal flowing into the cavity 210 by moving the plunger 910 can be more accurately controlled. .

<Third Embodiment>

Hereinafter, with reference to FIGS. 7 and 8, the melting furnace-heating furnace integrated pressure casting device 10B of the third embodiment according to the present invention will be described. For convenience of explanation, the same components as those in the second embodiment are assigned the same reference numerals and descriptions are omitted.

In contrast to the melting furnace-thermal insulation furnace integrated pressure casting device 10 of the second embodiment, the melting furnace-thermal insulation furnace integrated pressure casting device 10B of the third embodiment has the pressure means 1000 connected to the thermal insulation furnace 100 and the melting furnace. It differs from the second embodiment in which the pressurizing means 900 is provided in the thermal insulation furnace 100 in that it is provided in the molten metal supply path between 300 and 300 .

Specifically, as shown in FIG. 7, the melting furnace-thermal insulation furnace integrated pressure casting device 10B of the third embodiment has molten metal supply pipes 320a and 320b that supply molten metal from the melting furnace 300 to the thermal insulation furnace 100. There is an intermediate storage space 330 in which the molten metal is stored, and the pressurizing means 1000 is provided at the upper part of the intermediate storage space 330 and includes a plunger 1010 that can move up and down inside the intermediate storage space 330, and , and a driving device 1020 that drives the plunger 1010.

In addition, the third embodiment, like the second embodiment, is provided to open and close the molten metal supply pipe 320 connected to the melting furnace 300 when the plunger 1010 moves forward or backward. Specifically, the height of the molten metal supply pipe 320a on the side of the melting furnace 300 centered on the intermediate storage space 330 is higher than the height of the molten metal supply pipe 320b on the side of the insulating furnace 100, and the plunger 1010 is lowered. As it moves forward, the molten metal supply pipe 320a connected to the melting furnace 300 is closed, and as it retreats upward, the molten metal supply pipe 320a connected to the melting furnace 300 is opened.

As the plunger 1010 moves downward, with the molten metal supply pipe 320a connected to the melting furnace 300 closed, as the plunger 1010 moves further downward, the intermediate storage space 330 as shown in FIG. 8 The molten metal stored in is pressurized, and the molten metal in the intermediate storage space 300 moves to the insulating furnace 100 through the molten metal supply pipe 320b. As a result, the molten metal in the insulating furnace 100 is pressurized to form a cap of the mold 200. It is charged into the tee (210).

Hereinafter, with reference to FIGS. 7 and 8, the operation of the melting furnace-heating furnace integrated pressure casting device 10A according to the second embodiment will be described.

First, as shown in FIG. 7, the molten metal material (M) is supplied to the supply tank 600 and the melting furnace 300 is heated by the second heating means 310 to enter the internal space 300S of the melting furnace 300. Creates molten metal. The generated molten metal is filled into the internal space 100S of the thermal insulation furnace 100 through the molten metal supply pipes 320a and 320b and the intermediate storage space 330. Additionally, the generated molten metal also fills the intermediate storage space 330. At this time, the first heating means 110 and the third heating means 321 are operated to maintain the molten metal in the thermal insulation furnace 100, the molten metal supply pipes 320a and 320b, and the intermediate storage space 330 in a molten state. The molten metal fills the internal space 100S of the thermal insulation furnace 100 and is maintained without flowing into the cavity 210 of the mold 210.

At the same time, the pressure reducing pump of the first pressure reducing means 500 is operated to remove the upper part of the molten metal, the space between the mold 200 and the chamber 400, and the mold 200 in the internal space 100S of the thermal insulation furnace 100. The gas present in the cavity 210 (including external air and gas generated during melting of the molten metal material M) is sucked in and discharged to the outside, and the valve 511 is closed to maintain a reduced pressure state. In addition, by operating the pressure reduction pump of the second pressure reduction means 700, the upper part of the molten metal and the gas in the supply tank 600 (when the external air and the molten metal material M) are melted in the internal space 300S of the melting furnace 300 The gas (including generated gas) is sucked in and discharged to the outside, and the valve 711 is closed to maintain the reduced pressure. For this reason, in the melting furnace-heating furnace integrated pressure casting device 10 of the third embodiment, all air in spaces other than the molten metal is discharged to the outside.

Meanwhile, since the mold 200 and the melting furnace 300 are depressurized together, the interior of the mold 200 and the interior of the melting furnace 300 maintain pressure parallel, so the molten metal in the thermal insulation furnace 100 is transferred to the mold due to the pressure difference. It is possible to prevent the inflow into (200).

In this state, the driving device 1020 of the pressurizing means 1010 shown in FIG. 8 is operated to advance the plunger 1010 into the intermediate storage space 330. As the plunger 1010 moves forward, it closes the molten metal supply pipe 320a on the side of the melting furnace 300 connecting the melting furnace 300 and pressurizes the molten metal in the intermediate storage space 330. As a result, the molten metal in the intermediate storage space 330 moves to the thermal insulation furnace 100 through the molten metal supply pipe 320b, and as a result, the molten metal in the thermal insulation furnace 100 is pressurized and flows into the mold 200 through the extrusion port 120. ) is filled into the cavity 210.

As described above, the melting furnace-heating furnace integrated pressure casting device 10B of the third embodiment is similar to the melting furnace-heating furnace integrated pressure casting device 10 of the first and second embodiments, and molten metal is directly placed in the warming furnace 100. The material M is not supplied, but is melted in the melting furnace 300 to become molten metal and then supplied to the thermal insulation furnace 200 through the molten metal supply pipes 320a and 302b, so that the molten metal is stored in the thermal insulation furnace 100. While supplying, the molten metal in the thermal insulation furnace 100 is blocked from the outside and is not exposed to the outside. Therefore, the problem of the molten metal in the thermal insulation furnace being exposed to the outside and being oxidized or partially solidified due to the thermal insulation furnace not being liquid-tight can be solved.

In addition, in the melting furnace-thermal furnace integrated pressure casting device 10B of the third embodiment, the plunger 1010 is advanced inside the intermediate storage space 330 in a state in which all gases in spaces other than the molten metal are discharged to the outside, thereby forming the mold 200. ) Since the molten metal is filled into the cavity 210, it is possible to obtain a high-quality molded product by preventing bubbles from forming during the process of filling the molten metal into the mold.

In addition, in the third embodiment, the plunger 1010 is moved by the driving device 1020, and since there is no change in pressure due to compression and expansion, the amount of movement can be precisely controlled, so that the mold 200 is moved by the advance of the plunger 1010. ) can accurately control the amount of molten metal filled into the inside.

And in the third embodiment, the plunger 1010 moves forward to close the molten metal supply pipe 320a connecting the melting furnace 300, and then pressurizes the molten metal in the intermediate storage space 330 into the cavity 210 of the mold 200. Since the molten metal is filled, the molten metal does not flow in through the molten metal supply pipe 320a while the cavity 210 is filled with the molten metal. As a result, while filling the cavity 210 with molten metal, the amount of molten metal in the thermal insulation furnace 100 is maintained constant, making it possible to more accurately control the amount of molten metal flowing into the cavity 210 by moving the plunger 910. there is.

Above, embodiments of the present invention have been described in detail. The first to third embodiments described above merely represent specific examples for carrying out the present invention. The content of the first to third embodiments does not limit the technical scope of the present invention, and many design changes such as changes, additions, and deletions of constituent elements are possible without departing from the spirit of the invention.

For example, the second pressure reducing means 700 in the first to third embodiments is connected to the connection pipe 630 of the molten metal material M, but supplies gas into the supply tank 600 and the melting furnace 300. As long as it has a pulling effect, it may be connected to the melting furnace 300.

Likewise, the pressurizing means 800 in the first embodiment is connected to the supply tank 600 of the molten metal material M, but if it functions to supply an inert gas into the supply tank 600 and the melting furnace 300, It may be connected to the melting furnace 300.

In addition, in the first to third embodiments, the pressure reduction pipe 510 of the first pressure reduction means 500 and the pressure reduction pipe 710 of the second pressure reduction means 700 are a pressure reduction tank 520 and a pressure reduction tank 720, respectively. It is connected to a pressure reduction pump (not shown) through the medium, but may be connected to the pressure reduction pump without the pressure reduction tank 520 and the pressure reduction tank 720.

Likewise, the pressurization pipe 810 of the pressurization means 800 in the first embodiment is connected to a pressurization pump (not shown) via the pressurization tank 820, and the pressurization pump is connected not via the pressurization tank 820. It may be connected to .

In addition, in the first to third embodiments, when the molten metal in the thermal insulation furnace 100 is pressurized by the pressurizing means 800, 900, and 1000 and filled into the cavity 210 of the mold 200, the chamber 400 is in a depressurized state. It is maintained at , but the inert gas may be continuously introduced into the chamber 400.

10, 10A, 10B: Melting furnace-heating furnace integrated pressure casting device
100: warming furnace 120: extrusion port
110: first heating means 200: mold
210: cavity 300: melting furnace
310: second heating means 320, 320a, 320b: molten metal supply pipe
330: intermediate storage space 400: chamber
500: first pressure reducing means 510: pressure reducing piping
530: cooling means 600: supply tank
700: second pressure reducing means 710: pressure reducing piping
730: cooling means 800, 900, 1000: pressurizing means
810: pressurized pipe 910, 1010: plunger
920, 1020: Drive device M: Molten metal material

Claims (9)

A thermal insulation furnace that maintains the molten metal in a molten state and has an extrusion port on one side for supplying the molten metal,
a mold disposed on one side of the thermal insulation furnace and having a cavity communicating with the extrusion port therein;
A melting furnace that melts a molten metal material supplied from the outside and supplies the molten metal to the thermal insulation furnace through a molten metal supply pipe in communication with the thermal insulation furnace;
a pressurizing means for pressurizing the molten metal in the thermal insulation furnace and supplying the molten metal into the cavity of the mold through the extrusion port;
a chamber connected to the thermal insulation furnace and inside which the mold is disposed, and maintaining the mold in a vacuum state by reducing pressure;
first pressure reducing means for withdrawing gas in the chamber;
It communicates with the melting furnace and includes a second pressure reducing means for withdrawing gas in the melting furnace,
The insulating furnace and the melting furnace are integrally connected via the molten metal supply pipe and provided in one housing, and the molten metal in the melting furnace is maintained isolated from the outside while being supplied to the insulating furnace through the molten metal supply pipe. ,
In a state in which gas in the chamber is removed by the first pressure reducing means and gas is removed in the melting furnace by the second pressure reducing means, an inert gas is supplied to the melting furnace through the pressurizing means to pressurize the molten metal in the melting furnace. A melting furnace-heating furnace integrated pressure casting device, characterized in that molten metal is supplied to the cavity of the mold by doing so. In claim 1,
A melting furnace-thermal furnace integrated pressure casting device, characterized in that when supplying the molten metal material to the melting furnace, a material capable of deoxidizing is inputted together. delete delete delete delete delete delete delete

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