KR20120127002A - Device and method for casting high melting point metal - Google Patents

Abstract

PURPOSE: A device and a method for casting high melting point metal are provided to prevent under charge of molten metal in a mold due to low temperature by preheating the mold before injection of molten metal into the mold. CONSTITUTION: A device for casting high melting point metal comprises a first chamber(12) which contains a crucible(14) therein to melt metal, a second chamber(16) which is connected to the side of the first chamber and contains a mold(30) therein, an opening and closing unit(40) which selectively opens and closes a molten metal path connected between the first and second chambers in an airtight manner, a vacuum unit(90) which is connected to the first and second chambers to create a vacuum in the first and second chambers, a compression unit which is connected to the first chamber and applies pressure to the first chamber, a rotating unit(70) which rotates the first chamber to locate the second chamber at the bottom so that molten metal in the crucible can be dropped into the mold of the second chamber, and a preheating unit(80) which is installed inside the second chamber and preheats the mold.

Description

High melting point metal casting device and casting method {DEVICE AND METHOD FOR CASTING HIGH MELTING POINT METAL}

The present invention relates to a casting apparatus. More particularly, the present invention relates to a high melting point metal casting apparatus and a casting method that enable the high melting point metal to be cast more precisely and easily.

In general, high melting point metals such as titanium, nickel, and copper are relatively difficult to dissolve, and casting defects are easily generated due to contamination of the crucible, atmosphere control, and handling during melting due to high temperature.

The technique of effectively injecting molten titanium into the mold during the casting process is one of the important element technologies. The injection method of the molten titanium is largely classified into static casting, centrifugal casting and antigravity casting according to its driving force.

Static casting is the easiest way to inject molten titanium into a mold using gravity without a separate device. However, most of the titanium molten metal is difficult to give overheating to secure fluidity, and there is a difficulty in controlling the injection speed of the molten metal. In general, during static casting, it is necessary to increase the size of the ball system and install a pressure bath, but even if a sufficient pressure bath is installed, it is difficult to solidify solidly, and defects frequently occur in the casting.

As a solution to this problem, a centrifugal casting method has been proposed. Centrifugal casting is a method of improving the fluidity or fillability of the melt by centrifugal force rather than improving the fluidity by superheating and mold preheating.

Centrifugal casting methods can be divided into horizontal and vertical. Vertical centrifugal casting should increase the rotation speed and increase the mold diameter to secure centrifugal force. Under such centrifugal force, a mold that withstands 30G or more is required, and thus it is difficult to apply to practical production. Horizontal centrifugal casting does not generate centrifugal force in the mold, but rather gives centrifugal force to the molten metal itself. However, there is a problem in that productivity is reduced because only one-time casting is possible according to the flow of the molten metal. In the case of a precision casting mold, there is a difficulty in the fixing device.

Antigravity casting is not greatly affected by casting method, and it can produce sound castings by forming stable laminar flow and relatively less defects. However, there is a problem that the production yield is reduced by reducing the castability when manufacturing a fine casting by reducing the driving force according to the antigravity and low pressure.

Accordingly, the present invention provides a high melting point metal casting apparatus and a casting method that enable more efficient and stable injection of molten metal into a mold during casting.

In addition, the present invention provides a high melting point metal casting apparatus and a casting method for solving the problem that the flowability of the molten metal during casting is not enough to cast a fine structure and frequently causes defects on the surface and inside.

In addition, the present invention provides a high melting point metal casting apparatus and a casting method to improve productivity by overcoming low productivity, which is a disadvantage of the existing centrifugal casting and antigravity casting.

In addition, the present invention provides a high melting point metal casting apparatus and a casting method capable of improving a stopper contamination problem or a sealing problem of a nozzle generated in a conventional structure injecting molten metal vertically into a mold.

To this end, the apparatus includes a first chamber having a crucible therein to dissolve metal, a second chamber connected to the side of the first chamber, and having a mold therein, the airtightness between the first chamber and the second chamber. Opening and closing portion for selectively opening and closing the molten metal passage to maintain communication, a vacuum portion connected to the first chamber and the second chamber to form a vacuum in the first chamber and the second chamber, connected to the first chamber and the first Pressurizing unit for applying pressure to the chamber, the first chamber is rotated to place the second chamber connected to the first chamber side at the bottom and the first chamber is located above the second chamber so that the molten metal in the crucible as the mold of the second chamber. Rotating portion for dropping, may be installed in the second chamber may include a preheater for preheating the mold.

The apparatus may further include a vibration unit installed in the second chamber and connected to the mold to apply vibration to the mold.

The second chamber may have a structure in which a mold provided therein is disposed toward a side surface of the first chamber so that the molten metal of the mold faces the molten metal passage.

The molten metal passage may be formed at a position corresponding to an upper end of the crucible provided in the first chamber.

The opening and closing unit may include an opening and closing door that is installed between the first chamber and the second chamber to open and close the molten metal passage, and a driving unit that controls and operates the opening and closing door.

The pressurization part may include a valve installed on an inert gas tank for supplying an inert gas into the first chamber and a gas line connecting the first chamber.

The apparatus may further include a temperature sensor for detecting a melt temperature of the crucible, and a controller for calculating a measured value of the temperature sensor and performing a casting process.

On the other hand, the present casting method is to charge the crucible of the first chamber and lower the pressure in the first chamber to form a vacuum pressure, to melt the metal, to lower the pressure in the second chamber in which the mold is installed to reduce the vacuum pressure. Forming, preheating the mold of the second chamber, supplying the molten metal melted in the crucible to the mold, and increasing the pressure in the first chamber.

In addition, the present casting method may further include supplying the molten metal to the mold and applying vibration to the mold during product casting.

As described above, by preheating the mold to an appropriate temperature before injecting the molten metal into the mold, it is possible to prevent unfilling of the molten metal in the mold due to the temperature drop and to improve the filling property of the cast product.

In addition, by applying vibration to the mold during the molten metal injection process, it is possible to further increase the filling of the casting.

In addition, it is possible to maximize the driving force of the molten metal injection through the pressure control of the double chamber.

In addition, the molten metal can be injected into the mold more quickly and cast, thereby minimizing the contamination of the molten metal and defects of the product.

In addition, by securing the injection driving force of the molten metal by using the gravity and the pressure difference, the molten metal is completely filled even in the fine structure pattern to produce a high-quality casting.

In addition, it is possible to significantly improve productivity by improving the injection rate of the molten metal into the mold.

In addition, by rotating the chamber to inject the molten metal into the mold, it is possible to fundamentally block the stopper contamination problem or sealing problem of the nozzle generated in the existing structure, and to minimize the defect of the product.

1 is a schematic configuration diagram showing a high melting point metal casting apparatus according to the present embodiment.
2 is a schematic view for explaining an operating state of the high melting point metal casting apparatus according to the present embodiment.
3 is a schematic flowchart illustrating a high melting point metal casting process according to the present embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. As can be easily understood by those skilled in the art, the embodiments described below may be modified in various forms without departing from the concept and scope of the present invention. Where possible the same or similar parts are represented with the same reference numerals in the drawings.

All terms including technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

In the following description, as an example of a high melting point metal, a casting apparatus and a casting method for melting and casting titanium will be described. However, the present invention is not limited thereto and may be applicable to other high melting point metals in addition to titanium.

1 and 2 show a casting apparatus according to the present embodiment.

As shown, the apparatus 10 is provided with a crucible 14 therein, the first chamber 12 to dissolve titanium, and the mold 30 is connected to the side of the first chamber 12 The second chamber 16 is provided, the opening and closing portion 40 for selectively opening and closing the molten metal passage (18) communicated while maintaining the airtight between the first chamber 12 and the second chamber 16, the first A vacuum unit connected to the chamber 12 and the second chamber 16 to form a vacuum in the first chamber 12 and the second chamber 16, the first chamber connected to the first chamber 12 A pressurizing unit for applying pressure to the 12, the first chamber 12 is rotated to place the second chamber 16 connected to the side of the first chamber at the bottom and the first chamber is located above the second chamber to the crucible ( 14 includes a rotating part 70 for injecting the molten metal into the mold 30 of the second chamber, and a preheating part 80 installed in the mold 30 of the second chamber 16 to preheat the mold. do.

In addition, the apparatus 10 further includes a vibration unit 90 installed in the second chamber 16 and connected to the mold 30 to apply vibration to the mold 30.

The first chamber 12 and the second chamber 16 have a structure that is independently separated from each other while maintaining airtightness.

As shown in FIG. 1, in the present embodiment, the second chamber 16 has a horizontal direction (a side surface of the first chamber 12 based on a state in which the first chamber is erected in the vertical direction (X-axis direction on the drawing)). It is installed lying down in the Y-axis direction in the drawing.

The mold 30 provided in the second chamber 16 is laid down in a horizontal direction so that the pouring port 32 of the mold 30 faces the molten metal passage 18 communicating between the first chamber and the second chamber. have.

When the chamber is rotated and the mold 30 is positioned below the crucible 14, the molten metal in the crucible may be injected into the molten metal 32 of the mold 30 by gravity.

As such, the apparatus includes two independent chambers, and the molten titanium melted in the first chamber 12 is more rapidly and precisely controlled by the pressure difference and gravity between the first chamber 12 and the second chamber 16. It can be injected in a pattern of the mold (30).

As the chambers are arranged at right angles in the present embodiment, the crucible 14 provided in the first chamber 12 and the mold 30 provided in the second chamber 16 are also disposed at an angle of 90 degrees. The apparatus is not limited to a structure in which crucibles and molds installed in two chambers are arranged at right angles as described above. For example, the apparatus is not particularly limited as long as the mold may be disposed at an angle smaller than or greater than a right angle with respect to the crucible, and the structure may rotate the two chambers so that the molten metal in the crucible may flow into the molten metal 32 of the mold. .

The first chamber 12 is a component that dissolves titanium and supplies molten metal to the lower second chamber 16. One side of the first chamber 12 is connected to a vacuum unit to maintain a vacuum state when dissolving titanium. In addition, a pressurizing part is connected to one side of the first chamber 12 so as to apply pressure during molten metal injection.

The vacuum unit includes an air line 50 connected to an upper end of the first chamber 12 and a vacuum pump 52 connected to the air line 50. The valve 54 is installed on the air line 50 to selectively open and close the air line.

Accordingly, when the vacuum pump 52 is driven, vacuum pressure is formed in the first chamber 12 while the air in the first chamber 12 is discharged.

In addition, the pressurizing unit may be an inert gas tank 60 for supplying an inert gas into the first chamber 12, a gas line 62 connecting the inert gas tank 60 to the upper end of the first chamber 12, and And a valve 64 installed on the gas line 62. Therefore, when the valve 64 is opened, an inert gas is introduced into the first chamber 12 through the gas line 62 to increase the pressure inside the first chamber 12.

In the crucible 14 installed in the first chamber 12, an induction coil 17 is installed at an outer circumference of the crucible 14 to dissolve titanium. The crucible 14 is not limited to the above-described structure, it may be equipped with flotation melting or skull melting equipment using a water-cooled crucible.

The crucible 14 is inclined according to the rotation of the first chamber 12 in a vertical state to discharge the molten melt through the open top. In this embodiment, the upper end of the crucible 14 is protruded to the outside for stable discharge of the molten metal to form the injection portion 15.

In addition, the first chamber 12 may be provided with a window 13 for observing the inside. One side of the crucible 14 is provided with a temperature sensor 19 for measuring the melt temperature in the crucible 14. The temperature sensor 19 is connected to the control unit 20 to apply an output signal. The control unit 20 is to control the operation of each component by calculating the output value of the temperature sensor 19, the operation thereof will be described later.

On the other hand, the second chamber 16 is a component for mounting the mold 30 and injecting molten metal to manufacture the final product. The second chamber 16 is provided separately from the first chamber 12 and is connected to the side of the first chamber 12 while maintaining airtightness through the opening and closing portion 40.

In the present embodiment, the second chamber 16 is connected to an independent vacuum unit to form a vacuum pressure separately from the first chamber 12. The vacuum unit includes an air line 56 connected to an upper end of the second chamber 16 and a vacuum pump 58 connected to the air line. The valve 59 is installed on the air line to selectively open and close the air line. The apparatus may have a structure in which one vacuum pump is connected to two chambers in addition to a structure in which the vacuum pumps 52 and 58 are provided in the first chamber 12 and the second chamber 16, respectively.

Here, the mold 30 provided in the second chamber 16 is disposed in the Y-axis direction so that the spout 32 at the upper end of the mold faces the side of the first chamber as shown in FIG. 1.

The mold 30 may be manufactured by applying a general precision casting process. After casting the casting to be made of a wax material, the mold 30 is manufactured using alumina, zirconia, or gypsum-based material, which is less reactive with titanium.

That is, in order to manufacture the mold 30 in the present embodiment, the wax replica material is placed in the flask, the mold casting material 34 in the slurry form is injected and dried, and then the wax material is removed to form the pattern 36 and then a predetermined temperature. By sintering at, the mold 30 excellent in air permeability can be manufactured.

The mold 30 installed in the second chamber 16 has a structure that ensures breathability so that the vacuum pressure can reach the inside.

In the present embodiment, the mold 30 has a structure that ensures breathability by firing so that the density does not exceed 40%. In addition, the flask may be formed with a hole on the surface at intervals. Accordingly, when the vacuum pressure is formed in the second chamber 16, the vacuum pressure is applied to the inside of the mold 30 to maintain the vacuum pressure.

In addition, the second chamber 16 is provided with a preheating unit 80 for heating the mold to preheat to a predetermined temperature.

The preheating unit 80 may be applied to various structures such as an induction coil or a graphite heater, and is not particularly limited as long as the structure can heat the mold 30. As the mold 30 is preheated to a predetermined temperature in this way, when the molten metal is injected into the mold, it is possible to prevent unfilling due to the temperature drop of the mold. The mold preheating temperature by the preheating unit 80 may be sufficient to prevent unfilling of the melt due to the temperature drop of the mold.

And one side of the mold 30 is provided with a temperature sensor 82 for measuring the temperature of the mold. The temperature sensor 82 is connected to the control unit 20 to apply an output signal. The control unit 20 preheats the mold to a set value by calculating the output value of the temperature sensor 82 to control the preheating unit 80.

The first chamber 12 and the second chamber 16 having the above-described structure communicate with each other through the molten metal passage 18 formed on the side of the first chamber. In the present embodiment, the molten metal passage 18 is formed at a position corresponding to the injection portion of the upper end of the crucible 14. The molten metal falling from the injection portion of the crucible may smoothly pass through the molten metal passage 18. The size of the molten metal passage is not particularly limited. In the molten metal passage 18, an opening and closing portion 40 is disposed to maintain the airtightness between the first chamber 12 and the second chamber 16 and to selectively open and close the molten metal passage 18.

The opening and closing portion 40 is provided between the first chamber 12 and the second chamber 16 and includes an opening and closing door 46 for opening and closing the molten metal passage, and a driving unit 48 for controlling and operating the opening and closing door.

The opening and closing door 46 is slidably installed between the first chamber and the second chamber and is opened and closed by the driving unit 48. The driving unit 48 for operating the opening / closing door 46 is not particularly limited as long as the structure capable of sliding the opening / closing door 46 may be, for example, a driving cylinder that is elastically operated by air or hydraulic pressure.

Accordingly, the second chamber 16 communicates with the first chamber when the opening / closing door 46 is opened while keeping the airtight on the side of the first chamber 12.

The rotating unit 70 rotates the first chamber 12 to switch positions of the first chamber 12 and the second chamber 16 installed in the first chamber.

The rotating part 70 is not particularly limited as long as it has a structure capable of rotating the first chamber and the second chamber. For example, the rotating part may be a structure in which the first chamber and the second chamber are disposed on a rotating plate of a rotatable structure and the rotating plate is rotated using a driving force such as a manual or a motor. In response to the driving of the pivoting part 70, the second chamber 16 moves downward while the second chamber 16 is positioned on the side of the first chamber 12, and the first chamber is shifted to the upper position of the second chamber. .

On the other hand, between the second chamber 16 and the mold 30 is provided with a vibration unit 90 for vibrating the mold. In the present embodiment, the vibrator 90 is installed below the mold 30 to apply vibration to the bottom of the mold. The vibrator 90 may be formed of various structures, including an ultrasonic vibration device capable of applying vibration to the mold by ultrasonic waves, and all of the structural surfaces capable of applying fine vibration to the mold are applicable.

As the mold 30 vibrates finely, the molten metal can be more easily filled into the gap between the complicated and fine molds. Thus, the filling integrity of the mold can be increased to manufacture a product having a fine and complicated structure.

Hereinafter, the casting process by the present casting apparatus with reference to Figures 2 and 3 as follows.

The first chamber 12 before the titanium dissolution is disposed in the vertical direction (X-axis direction in FIG. 1) such that the bottom of the inner crucible 14 faces the ground. Accordingly, the second chamber 16 provided on the side of the first chamber 12 is placed in the horizontal direction (the Y-axis direction in FIG. 1) so that the mold 30 therein is laid down. The opening and closing door is operated to open the molten metal passage, so that the first chamber 12 and the second chamber 16 communicate with each other through the molten metal passage 18.

In this state, titanium is charged into the crucible 14, and the air inside the first chamber 12 in which the crucible 14 is installed is discharged to form a vacuum pressure. (S100 to S200)

The degree of vacuum in the first chamber 12 is maintained below 20 mbar. As the titanium proceeds to dissolve in the vacuum state, the titanium does not react with the air as much as possible.

The molten metal temperature of titanium is detected by the temperature sensor 19 installed in the crucible 14. The detection value of the temperature sensor 19 is applied to the control unit 20, and the control unit 20 adjusts the heating temperature of the crucible 14 so that the temperature of the melt is 100 to 160 degrees higher than the melting point of titanium, 1668 degrees. Melt (S300)

When the dissolution of titanium is completed, it is transferred to the second chamber 16 within a short time to minimize the contact time with the crucible 14 to minimize contamination. That is, the molten titanium molten metal reaches a sufficient temperature to transfer the molten metal in a state in which fluidity is sufficiently secured.

Here, the second chamber 16 is prepared by mounting a flask of the mold 30 including the casting material before melting the titanium metal. The second chamber 16 maintains a vacuum state like the first chamber in a state of communicating with the first chamber as described above, or operates the vacuum unit under the control of the controller 20 separately from the first chamber 12. Vacuum pressure is formed inside to maintain the standby state. (S400)

In addition, the control unit 20 maintains the vacuum pressure of the second chamber as described above, and operates the preheating unit 80 installed in the second chamber to preheat the mold 30.

In the present embodiment, the forming of the vacuum pressure in the first chamber (S400) and the preheating of the mold (S500) do not necessarily need to be performed in the same order as described above. For example, the mold preheating step may proceed before the first chamber internal vacuum pressure forming step, and the two steps may proceed together.

When the vacuum pressure is formed in the second chamber as described above, and the preheating of the mold is completed, the molten titanium molten metal is injected into the mold 30 according to the signal of the controller 20.

In the present embodiment, the control unit 20 rotates the first chamber 12 and the second chamber 16 at right angles by controlling the rotating unit 70 to inject molten metal. At the same time, when the open / close door is blocking the molten metal passage, the driving unit 48 is controlled to slide the open / close door 48 to open the molten metal passage 18.

When the first chamber 12 and the second chamber 16 are rotated according to the driving of the rotating unit, the position of each chamber is moved downward while the second chamber is positioned with the second chamber positioned on the side of the first first chamber. Is switched to a state located above the second chamber. Accordingly, as shown in FIG. 2, the second chamber is disposed in the vertical direction (the X-axis direction of FIG. 2) so that the spout 32 of the inner mold 30 faces upward. The first chamber 12 is placed in the horizontal direction (Y-axis direction in FIG. 2) at the upper portion of the second chamber, so that the crucible 14 therein is laid down.

The molten metal in the crucible 14 flows down by gravity along the injection portion of the top of the crucible. In this way, the molten metal discharged from the crucible flows into the second chamber 16 through the open molten metal passage 18 and is injected into the mold through the molten metal 32 of the mold 30.

In the molten metal injection process, the controller 20 controls the vibrator 90 to vibrate the mold into which the molten metal is injected. Thus, the mold 30 maintains a vibration state when injecting the molten metal. (S700) The molten metal is injected into the mold vibrating finely. The vibrating process of the mold may be performed before or during the injection of the molten metal and continues until the molten metal is completed.

When the molten metal is injected into the mold of the second chamber according to the rotation of the chamber, the second chamber 16 maintains a vacuum pressure state, and the first chamber 12 is rapidly switched from a vacuum pressure state to a pressurized state. )

In this embodiment, the first chamber 12 is increased in pressure to 2 bar. That is, the control unit 20 closes the valve 54, stops the operation of the vacuum pump 52, and opens the valve 64 installed in the gas line 62. The inert gas filled in the inert gas tank 60 is introduced into the first chamber 12 in an instant to increase the pressure inside the first chamber 12.

In this case, the second chamber 16 is in a state in which the internal vacuum pressure is applied, and the vacuum pressure extends to the inside of the mold 30 which is ensured breathability, so that the vacuum pressure is also applied to the pattern formed on the mold 30.

Accordingly, the high pressure of the inert gas introduced into the first chamber 12 acts on the melt discharged from the crucible 14, and the vacuum pressure inside the second chamber 16 is caught by the pattern in the mold 30. To increase the injection driving force. In this embodiment, this conversion is automatically performed within 2 seconds, and the pressure state is maintained to maximize the effect.

In this way, the molten metal to the crucible 14 is injected into the mold 30 in an instant by the pressure difference due to the high pressure of the inert gas applied to the first chamber 12 and the vacuum pressure maintained in the second chamber 16. . In addition, as the first chamber 12 is positioned above the second chamber 16, the molten metal is added with drop energy due to a height difference, thereby increasing the injection speed.

Therefore, the molten metal is injected to the minute portion of the pattern more quickly, thereby minimizing the contamination of the molten metal and the defect of the product.

While the illustrative embodiments of the present invention have been shown and described, various modifications and alternative embodiments may be made by those skilled in the art. Such variations and other embodiments will be considered and included in the appended claims, all without departing from the true spirit and scope of the invention.

10 casting device 12 first chamber
14 crucible 16 second chamber
18: passage 19: temperature sensor
20: control unit 48: drive unit
30: mold 32: tanggu
40: opening and closing part 46: opening and closing door
52,58: vacuum pump 60: inert gas tank
70: rotating part 80: preheating part
90: vibrating part

Claims (11)

A first chamber provided with a crucible therein to melt the metal;
A second chamber connected to the side of the first chamber and having a mold therein;
Opening and closing part for selectively opening and closing the molten metal passage communicating while maintaining hermeticity between the first chamber and the second chamber,
A vacuum unit connected to the first chamber and the second chamber to form a vacuum in the first chamber and the second chamber,
A pressurizing part connected to the first chamber to apply pressure to the first chamber,
A rotating part for rotating the first chamber to position a second chamber connected to the side of the first chamber at a lower portion thereof, and placing the first chamber at an upper portion of the second chamber to drop the molten metal in the crucible into a mold of the second chamber;
A preheating part installed in the second chamber to preheat the mold
High melting point metal casting apparatus comprising a. The method of claim 1,
And a vibration unit installed in the second chamber and connected to the mold to vibrate the mold. The method according to claim 1 or 2,
The second chamber is a high melting point metal casting apparatus having a mold provided therein disposed toward the side of the first chamber so that the molten metal of the mold toward the molten metal passage. The method of claim 3, wherein
The crucible in the first chamber and the mold in the second chamber are disposed at a 90 degree angle. The method of claim 4, wherein
The molten metal passage is formed in a position corresponding to the upper end of the crucible provided in the first chamber. The method according to claim 1 or 2,
And a temperature sensor for detecting a molten metal temperature of the crucible, and a controller configured to control and operate each component by calculating a measured value of the temperature sensor. The method according to claim 1 or 2,
The opening and closing portion is provided between the first chamber and the second chamber, the high melting point metal casting apparatus including an opening and closing door for opening and closing the molten metal passage, the drive unit for controlling the opening and closing door. The method of claim 7, wherein
The pressurization unit is a high melting point metal casting apparatus including a valve installed on the gas line connecting the inert gas tank and the first chamber for supplying the inert gas into the first chamber. The method of claim 8,
The vacuum unit is a high melting point metal casting apparatus including an air line connected to each of the first chamber and the second chamber, a vacuum pump connected to the air line, respectively, and a valve installed on each air line. Charging the crucible of the first chamber and lowering the pressure inside the first chamber to form a vacuum pressure;
Melting the metal,
Preheating the mold,
Reducing the pressure in the second chamber where the mold is installed to form a vacuum pressure,
Rotating the first chamber and the second chamber to move the crucible above the mold to drop the molten metal melted in the crucible and to supply it to the mold;
Increasing the pressure in the first chamber
High melting point metal casting method comprising a. 11. The method of claim 10,
High melting point metal casting method further comprising the step of applying vibration to the mold when the molten metal is supplied to the mold.

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