CN112916832A - Vacuum suction casting device and method for high-melting-point, high-activity and high-purity alloy - Google Patents
Vacuum suction casting device and method for high-melting-point, high-activity and high-purity alloy Download PDFInfo
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- CN112916832A CN112916832A CN202110098713.6A CN202110098713A CN112916832A CN 112916832 A CN112916832 A CN 112916832A CN 202110098713 A CN202110098713 A CN 202110098713A CN 112916832 A CN112916832 A CN 112916832A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/06—Casting non-ferrous metals with a high melting point, e.g. metallic carbides
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Abstract
The invention relates to the field of metal casting, in particular to a vacuum suction casting device and method for high-melting-point, high-activity and high-purity alloy. The device comprises a smelting chamber and a suction casting chamber which are arranged up and down oppositely, wherein a tungsten electrode is arranged at the center of the top end of the smelting chamber, a copper crucible is arranged right below the tungsten electrode, a circulating water channel is arranged on the side wall of the copper crucible, and a suction casting valve is arranged at the bottom of the copper crucible; the suction casting chamber is provided with a metal mold, a mold pouring gate corresponds to the bottom opening of the copper crucible and a suction casting valve, the suction casting valve is made of metal materials with high melting point, low activity and good heat conductivity, the suction casting valve is connected with the output end of an air compressor, and the suction casting valve is opened through the air compressor so that molten alloy liquid in the copper crucible is injected into the metal mold. The device has the characteristics of controllable pressure difference, cleanness and large filling power, and can solve the problems of easy pollution and low success rate of the alloy with high melting point and high activity commonly existing in the near-net forming process.
Description
Technical Field
The invention relates to the field of metal casting, in particular to a vacuum suction casting device and method for high-melting-point, high-activity and high-purity alloy.
Background
High-temperature alloy, intermetallic compound, titanium alloy and other materials are widely applied to the fields of national defense, energy, aerospace and the like. Most of them have characteristics of high melting point and high activity. In addition, typical TiAl alloys of intermetallic compounds have very poor fluidity of alloy liquid and are difficult to mold. Therefore, scholars at home and abroad make various attempts to cast the high-melting-point, high-activity and high-purity alloy. Among them, vacuum suction casting processes originated in the 70's of the last century have attracted extensive interest from researchers. However, vacuum suction casting processes are commonly used for the preparation of low melting point, low activity materials and amorphous alloys. The bottom leakage type vacuum suction casting process and the antigravity suction casting process which are mature and applied at present can not meet the casting requirements of high-temperature alloy, intermetallic compounds and titanium alloy materials. For example, when the anti-gravity vacuum suction casting furnace is used for suction casting of TiAl intermetallic compounds, the suction nozzle and the preheated shell inevitably react with the high-melting-point and high-activity alloy liquid or generate inclusions, so that castings are polluted, the final oxygen content exceeds 1000ppm, and the alloy performance is greatly reduced. The graphite or boron nitride nozzle of the bottom leakage type vacuum suction casting equipment can also react with the alloy liquid at a higher temperature to cause pollution of the alloy liquid. In addition, in the existing bottom-leakage vacuum suction casting equipment for the high-melting-point alloy, a suction casting valve is not arranged in a through hole for communicating a smelting chamber and a suction casting chamber to control the alloy liquid, and a circulating water cooling system necessary in the bottom-leakage vacuum suction casting process can influence the uniformity of the superheat degree of the alloy liquid. Therefore, castings of large-size, high-melting-point and high-purity alloys prepared by the bottom-leakage vacuum suction casting process often have casting defects such as cold shut, undercasting, shrinkage porosity and air holes, and the success rate of suction casting is greatly reduced. Therefore, the development and invention of a vacuum suction casting process specially aiming at the alloy with high melting point, high activity and high purity are necessary, and the vacuum suction casting process has wide application value and market prospect.
Disclosure of Invention
By taking the mature vacuum suction casting process before into account and aiming at the problems of the alloy in the process of preparing high melting point, high activity and high purity alloy, the invention aims to provide a vacuum suction casting device of the alloy with high melting point, high activity and high purity and a using method of the device on the basis of bottom leakage type vacuum suction casting equipment based on the principle of differential pressure casting.
The invention is realized by the following technical scheme:
a vacuum suction casting device for high-melting-point, high-activity and high-purity alloy comprises a smelting chamber and a suction casting chamber which are arranged oppositely from top to bottom, wherein the smelting chamber and the suction casting chamber are connected in a mechanical sealing mode; a metal mold is arranged in the suction casting chamber, and a pouring gate of the metal mold corresponds to the suction casting valve and the bottom opening of the copper crucible;
the suction casting valve consists of a suction casting crucible with a through hole, a suction casting valve switch for controlling the opening and closing of the through hole of the suction casting crucible and a circulating water system positioned on the periphery of the suction casting crucible, the whole suction casting crucible is mechanically embedded into the bottom opening of the water-cooled copper crucible, the through hole of the suction casting crucible is positioned in the center of the bottom opening of the water-cooled copper crucible, and the lower part of the through hole corresponds to a pouring gate of a metal mold; the suction casting valve switch is connected with an air compressor through a drawing device, one end of the drawing device is connected with the suction casting valve switch through a connecting piece, the other end of the drawing device is connected with the output end of the air compressor, and the suction casting valve switch is opened through the air compressor, so that molten alloy liquid in the copper crucible is injected into the metal mold through the through hole.
The vacuum suction casting device for the high-melting-point, high-activity and high-purity alloy is characterized in that an argon filling port connected with a high-purity argon device is arranged on the side wall of the upper part of a smelting chamber, a circulating water channel is arranged on the side wall of a copper crucible, and a vacuum mechanical pump is communicated with the suction casting chamber through a pipeline.
According to the vacuum suction casting device for the high-melting-point, high-activity and high-purity alloy, a suction casting valve is embedded into an opening at the bottom of a water-cooled copper crucible in a mechanical sealing connection mode, a smelting chamber and the suction casting chamber are separated by the suction casting valve, and a micro gap is formed between the smelting chamber and the suction casting chamber; before the alloy liquid forms a liquid seal, the smelting chamber is communicated with the suction casting chamber in air pressure; and after the alloy liquid forms a liquid seal, regulating and controlling the pressure difference between the smelting chamber and the suction casting chamber.
The vacuum suction casting device for the alloy with high melting point, high activity and high purity, the suction casting crucible and the suction casting valve switch are processed by adopting tungsten, niobium or tantalum alloy materials with high melting point, low activity and good heat conductivity.
The vacuum suction casting device for the alloy with high melting point, high activity and high purity has the aperture of phi 10 mm-phi 100 mm.
According to the vacuum suction casting device for the high-melting-point, high-activity and high-purity alloy, a metal mold is of an eight-piece mechanical combined structure, a top dead head of the metal mold is symmetrically horn-shaped, more than two transverse and vertical exhaust channels are arranged in the metal mold, and the wall thickness of the metal mold is 1-8 cm.
A vacuum suction casting method of high-melting-point, high-activity and high-purity alloy comprises the following steps:
(1) non-consumable vacuum arc melting master alloy
Proportioning according to alloy proportion, putting the prepared raw materials into a copper crucible with a closed suction casting valve in a smelting chamber, and vacuumizing to 5.0 x 10-3Filling inert gas Ar into the smelting chamber through a high-purity argon device under Pa, opening circulating water, starting smelting through a tungsten electrode, adding electromagnetic stirring, repeatedly smelting for 4-6 times to ensure that the components of the master alloy are uniform, and cooling to form a master alloy ingot;
(2) remelting of master alloys
Placing a master alloy ingot on a suction casting crucible closed by a suction casting valve switch, placing a metal mold in a suction casting chamber, wherein a pouring gate of the metal mold corresponds to a through hole of the suction casting crucible so as to ensure that alloy liquid flows into the metal mold along the inner wall of the pouring gate of the metal mold; closing the smelting chamber, the suction casting valve and the suction casting chamber, and vacuumizing until the pressure in the smelting chamber is 5.0 x 10-3Charging inert gas Ar of 0.02-0.06 MPa into a high-purity argon device under Pa, and then carrying out arc-starting smelting on a tungsten electrode;
(3) suction casting chamber pressure P1Is determined
After the mother alloy is fully melted, the alloy liquid is completely melted in a liquid seal mannerThe pressure P at the time is recorded by a pressure gauge in a small gap at the joint of the smelting chamber and the suction casting chamber1；
(4) Pressure P of smelting chamber2Is determined
Record P1Then, continuously filling high-purity Ar into the smelting chamber, regulating and controlling the filling amount of the Ar according to different alloy components, and recording the pressure P at the moment through a pressure gauge after the filling is finished2(ii) a At the moment, the pressure difference delta P between the smelting chamber and the suction casting chamber is equal to P2-P1；
(5) Vacuum suction casting
Starting a vacuum mechanical pump of the suction casting chamber, then opening a suction casting valve switch of the suction casting crucible through a pneumatic drawing device controlled by an air compressor, and pouring the alloy liquid into a cavity of the metal mold under the coupling action of self gravity, pressure difference and the suction force of the vacuum mechanical pump.
According to the vacuum suction casting method of the alloy with high melting point, high activity and high purity, the current of a smelting power supply is 300-1000A before a suction casting valve switch is opened.
The vacuum suction casting method of the alloy with high melting point, high activity and high purity, the suction casting chamber pressure P10.01-0.06 MPa, and regulating and controlling the pressure P of the smelting chamber when the alloy liquid completely seals the micro gap between the smelting chamber and the suction casting chamber20.02-0.80 MPa, and the pressure P of the smelting chamber2Greater than suction casting chamber pressure P1。
The design idea of the invention is as follows:
aiming at the problems of difficult molding and easy pollution in the casting process of high-melting-point, high-activity and high-purity alloy materials represented by high-temperature alloys, intermetallic compounds and titanium alloys, the invention mainly carries out two-point innovation after the reference of the conventional bottom leakage type vacuum suction casting process. Firstly, the suction casting crucible adopts tungsten, niobium or tantalum alloy materials with high melting point, low activity and good thermal conductivity to replace graphite or boron nitride and other materials, so that clean smelting of alloy liquid with high melting point and high activity can be realized at higher temperature. In addition, when the large current is smelted, the circulating water arranged on the periphery of the suction casting crucible can ensure that the temperature of the suction casting crucible is below the melting point of the suction casting crucible, and further the cleanness of the gold liquid is maintained. Secondly, the suction casting valve is arranged to control the alloy liquid and quantitatively regulate and control the pressure difference. The suction casting valve is additionally arranged, so that the common phenomenon that part of the alloy liquid leaks in advance due to uneven superheat degree can be avoided; in addition, after the alloy liquid is ensured to have excellent fluidity, the existence of the suction casting valve can ensure that the highest pressure difference of the smelting chamber and the suction casting chamber is higher by about 0.8MPa, and the mold filling power is greatly improved. The invention can solve the problems of easy pollution, low success rate and high cost of the alloy with high melting point, high activity and high purity in the suction casting process.
The invention has the following advantages and beneficial effects:
(1) the success rate of suction casting is improved. The suction casting valve is additionally arranged on the basis of the bottom leakage type vacuum suction casting equipment, so that the phenomenon of leakage casting of alloy liquid passing through the suction casting through hole in advance due to increased pressure difference or partial overheating is avoided. In addition, the additionally arranged suction casting valve can ensure that enough pressure difference exists between the smelting chamber and the suction casting chamber, and the mold filling power is greatly improved.
(2) The purity of the high-melting-point and high-activity alloy is improved. The suction casting crucible made of metal material with high melting point, low activity and good heat conductivity is used to replace the graphite or boron nitride nozzle of the prior bottom leakage type vacuum suction casting equipment, so that the alloy liquid can not be polluted at higher temperature. In addition, the whole preparation process is carried out under the protection of inert gas, so that the oxygen content of the high-activity casting can be ensured to be in a reasonable range.
(3) And casting defects are reduced. Alloy liquid enters the die through the horn-shaped riser along the side wall of the die during pouring, and molten metal turbulence and entrainment generated in the mold filling process can be effectively controlled. In addition, a plurality of transverse and vertical exhaust channels arranged in the die also contribute to the exhaust of gas, and the process greatly reduces the generation of casting defects such as shrinkage cavity, shrinkage porosity and the like.
(4) The preparation cost is reduced. The large mold filling power provided by the invention can ensure that the alloy liquid is successfully filled in the metal mold without preheating. Compared with investment casting, the process greatly reduces the preparation period and the processing cost.
Drawings
FIG. 1 is a schematic view of a vacuum suction casting apparatus according to the present invention.
Fig. 2 is a schematic structural view of the suction casting valve in fig. 1.
Fig. 3 is an enlarged view of the metal mold of fig. 1.
FIG. 4 is a photograph of a plate-like suction cast sample prepared by carrying out the present invention.
The drawing shows the numbers, 1 smelting chamber, 2 suction casting chamber, 3 high-purity argon device, 4 tungsten electrode, 5 copper crucible, 6 circulating water, 7 alloy liquid, 8 suction casting valve, 9 air compressor, 10 metal mold, 11 vacuum mechanical pump, 12 suction casting crucible, 13 suction casting crucible through hole, 14 suction casting valve switch, 15 circulating water inlet, 16 circulating water outlet and 17 drawing device.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples.
As shown in figure 1, the vacuum suction casting device for the high-melting-point, high-activity and high-purity alloy mainly comprises a smelting chamber 1 and a suction casting chamber 2 which are arranged oppositely up and down, wherein the smelting chamber 1 and the suction casting chamber 2 are connected in a mechanical sealing mode, a tungsten electrode 4 is vertically arranged at the center of the top end in the smelting chamber 1, an argon filling opening connected with a high-purity argon device 3 is formed in the side wall of the upper part of the smelting chamber 1, and the high-purity argon device 3 can introduce high-purity argon (with the volume purity of 99.999%) into the smelting chamber 1. A copper crucible 5 is arranged under the tungsten electrode 4, alloy raw materials in the copper crucible 5 are melted into alloy liquid 7 through the tungsten electrode 4, a channel of circulating water 6 is arranged on the side wall of the copper crucible 5, and a suction casting valve 8 is arranged at the bottom of the copper crucible 5; a metal mold 10 is arranged in the suction casting chamber 2, and a pouring gate of the metal mold 10 corresponds to the suction casting valve 8 and the bottom opening of the copper crucible 5. The vacuum mechanical pump 11 is communicated with the suction casting chamber 2 through a pipeline and can vacuumize the suction casting chamber 2.
As shown in fig. 2, the suction casting valve 8 is composed of a suction casting crucible 12 with a suction casting crucible through hole 13, a suction casting valve switch 14 for controlling the opening and closing of the suction casting crucible through hole 13 on the suction casting crucible 12, and a circulating water system located at the periphery of the suction casting crucible 12, wherein the circulating water system is provided with a circulating water inlet 15 and a circulating water outlet 16, the lower part of the suction casting crucible through hole 13 corresponds to the bottom opening of the copper crucible 5, the pouring gate of the metal mold 10 below the suction casting crucible through hole 13 corresponds to, and the aperture size of the suction casting crucible through hole 13 is phi 10 mm-phi 100 mm; the suction casting valve switch 14 is connected with the air compressor 9 through the drawing device 17, one end of the drawing device 17 is connected with the suction casting valve switch 14 through a connecting piece, the other end of the drawing device 17 is connected with the output end of the air compressor 9, the suction casting valve switch 14 is opened through the air compressor 9, and molten alloy liquid 7 in the copper crucible 5 is injected into the metal mold 10 through the suction casting crucible through hole 13. Wherein, the suction casting crucible 12 and the suction casting valve switch 14 are made of metal materials (such as tungsten, niobium, tantalum, etc.) with high melting point, low activity and good heat conductivity.
As shown in fig. 3, the metal mold 10 is an eight-piece mechanical combination structure, and functions as: firstly, a transverse and vertical exhaust channel is arranged between the petals, so that gas in high-temperature liquid can be conveniently exhausted; and the thick heavy metal mold 10 is convenient to carry in a mechanical combination mode. After the molten alloy liquid 7 is injected into the metal mold 10 for molding, the casting structure is as follows: in the height direction of the plate-shaped casting, the lamellar interface is parallel to the surface of the casting; and in the thickness direction of the plate-shaped casting, columnar crystals are orderly and oppositely grown.
In addition, the top dead head of the metal mold 10 is symmetrically horn-shaped, more than two horizontal and vertical exhaust channels are arranged in the metal mold 10, and the wall thickness of the metal mold 10 is 1-8 cm.
Examples
In this example, the selected alloy Ti-48Al-2Cr-2Nb (at%) is representative of an alloy having a high melting point, high activity and poor fluidity. As shown in fig. 1-3, the specific steps and processes include:
(1) non-consumable vacuum arc melting master alloy
Proportioning according to the alloy proportion, putting the prepared raw materials in a copper crucible 5 in a smelting chamber 1 and a suction casting crucible 12 with a closed suction casting valve switch 14, vacuumizing to the pressure of the smelting chamber 1 to be 2.0 multiplied by 10-3Pa, filling inert gas Ar into the smelting chamber 1 through a high-purity argon device 3, opening circulating water 6, starting smelting through a tungsten electrode 4, adding electromagnetic stirring, repeatedly smelting for 5 times to ensure that the components of the master alloy are uniform, and cooling to form a master alloy ingot;
(2) remelting of master alloys
Placing 1Kg of prepared master alloy ingot on a suction casting crucible 12 with a closed suction casting valve switch 14, placing a metal mold 10 in a suction casting chamber 2, wherein a pouring gate of the metal mold 10 corresponds to a suction casting crucible through hole 13 of the suction casting crucible 12 so as to ensure that alloy liquid 7 flows into the metal mold 10 along the inner wall of the pouring gate of the metal mold 10; closing the smelting chamber 1, the suction casting valve 8 and the suction casting chamber 2, and vacuumizing until the air pressure of the smelting chamber 1 is 5.0 multiplied by 10-3Pa, filling inert gas Ar of 0.02-0.06 MPa into the high-purity argon device 3, and then carrying out arc-starting smelting on the tungsten electrode 4;
(3) suction casting chamber pressure P1Is determined
After the mother alloy is fully melted, the alloy liquid 7 is completely liquid-sealed in the micro gap at the joint of the smelting chamber 1 and the suction casting chamber 2, and the pressure P at the moment is recorded by a pressure gauge1；
(4) Pressure P of smelting chamber2Is determined
Record P1Then, the current is increased slowly for smelting, after the alloy liquid 7 has certain fluidity, high-purity Ar is filled into the smelting chamber 1, and after the filling is finished, the pressure P at the moment is recorded by a pressure gauge2(ii) a The pressure difference Δ P between the melting chamber 1 and the suction casting chamber 2 is then equal to P2-P1In the embodiment, Δ P is 40 to 50 KPa;
(5) vacuum suction casting
Starting the vacuum mechanical pump 11 of the suction casting chamber 2, then opening the suction casting valve switch 14 of the suction casting crucible 12 through a pneumatic drawing device 17 controlled by an air compressor 9, and pouring the alloy liquid 7 into the cavity of the metal mold 10 under the coupling action of self gravity, pressure difference and the suction force of the vacuum mechanical pump 11.
As shown in FIG. 4, the alloy liquid 7 of this example was successfully filled, and 730g of the 1Kg master alloy was successfully suction cast. As shown in Table 1, the alloy prepared by the invention is clean and uniform.
TABLE 1 chemical gas analysis of vacuum suction cast Ti-48Al-2Cr-2Nb alloy
| Ti | Al | Cr | Nb | O | N | H | ||
| Measured value | wt.％ | Bal. | 33.0 | 2.64 | 4.80 | 0.047 | 0.009 | 0.0018 |
| Theoretical value | wt.％ | Bal. | 33.3 | 2.67 | 4.78 | / | / | / |
The results of the examples show that the invention solves the problems of easy pollution and low success rate of the alloy with high melting point and high activity in the near-net forming process. In addition, the method has short period for preparing the alloy, low production cost and convenient industrial popularization.
Claims (9)
1. A vacuum suction casting device for high-melting-point, high-activity and high-purity alloys is characterized by comprising a smelting chamber and a suction casting chamber which are arranged oppositely from top to bottom, wherein the smelting chamber and the suction casting chamber are connected in a mechanical sealing mode; a metal mold is arranged in the suction casting chamber, and a pouring gate of the metal mold corresponds to the suction casting valve and the bottom opening of the copper crucible;
the suction casting valve consists of a suction casting crucible with a through hole, a suction casting valve switch for controlling the opening and closing of the through hole of the suction casting crucible and a circulating water system positioned on the periphery of the suction casting crucible, the whole suction casting crucible is mechanically embedded into the bottom opening of the water-cooled copper crucible, the through hole of the suction casting crucible is positioned in the center of the bottom opening of the water-cooled copper crucible, and the lower part of the through hole corresponds to a pouring gate of a metal mold; the suction casting valve switch is connected with an air compressor through a drawing device, one end of the drawing device is connected with the suction casting valve switch through a connecting piece, the other end of the drawing device is connected with the output end of the air compressor, and the suction casting valve switch is opened through the air compressor, so that molten alloy liquid in the copper crucible is injected into the metal mold through the through hole.
2. The vacuum suction casting apparatus for high melting point, high activity and high purity alloy as claimed in claim 1, wherein the side wall of the upper part of the melting chamber is provided with an argon gas filling port connected to a high purity argon gas device, the side wall of the copper crucible is provided with a passage for circulating water, and the vacuum mechanical pump is communicated with the suction casting chamber through a pipeline.
3. The vacuum suction casting device for high melting point, high activity and high purity alloy according to claim 1, wherein the suction casting valve is embedded into the bottom opening of the water-cooled copper crucible in a mechanical seal connection manner, the melting chamber and the suction casting chamber are separated by the suction casting valve, and a micro gap is arranged between the melting chamber and the suction casting chamber; before the alloy liquid forms a liquid seal, the smelting chamber is communicated with the suction casting chamber in air pressure; and after the alloy liquid forms a liquid seal, regulating and controlling the pressure difference between the smelting chamber and the suction casting chamber.
4. The apparatus for vacuum suction casting of high melting point, high activity and high purity alloys as claimed in claim 1, wherein the suction casting crucible and the suction casting valve switch are fabricated from tungsten, niobium or tantalum alloy materials having high melting point, low activity and good thermal conductivity.
5. A vacuum suction casting apparatus for high melting point, high activity and high purity alloys as defined in claim 1 wherein the size of the bore of the through hole is 10mm to 100 mm.
6. The vacuum suction casting apparatus for high melting point, high activity and high purity alloy according to claim 1, wherein the metal mold has an eight-piece mechanical combination structure, the top riser of the metal mold is symmetrically flared, more than two horizontal and vertical exhaust channels are provided in the metal mold, and the wall thickness of the metal mold is 1-8 cm.
7. A vacuum suction casting method of a high melting point, high activity and high purity alloy using the apparatus of any one of claims 1 to 6, comprising the steps of:
(1) non-consumable vacuum arc melting master alloy
Proportioning according to alloy proportion, putting the prepared raw materials into a copper crucible with a closed suction casting valve in a smelting chamber, and vacuumizing to 5.0 x 10-3Charging inert gas Ar into the smelting chamber through a high-purity argon device under Pa, opening circulating water, and passing through tungsten electrodeSmelting at the beginning, adding electromagnetic stirring, repeatedly smelting for 4-6 times to ensure that the components of the master alloy are uniform, and cooling to form a master alloy ingot;
(2) remelting of master alloys
Placing a master alloy ingot on a suction casting crucible closed by a suction casting valve switch, placing a metal mold in a suction casting chamber, wherein a pouring gate of the metal mold corresponds to a through hole of the suction casting crucible so as to ensure that alloy liquid flows into the metal mold along the inner wall of the pouring gate of the metal mold; closing the smelting chamber, the suction casting valve and the suction casting chamber, and vacuumizing until the pressure in the smelting chamber is 5.0 x 10-3Charging inert gas Ar of 0.02-0.06 MPa into a high-purity argon device under Pa, and then carrying out arc-starting smelting on a tungsten electrode;
(3) suction casting chamber pressure P1Is determined
After the mother alloy is fully melted, the alloy liquid is completely sealed with liquid to form a tiny gap at the joint of the smelting chamber and the suction casting chamber, and the pressure P at the moment is recorded by a pressure gauge1；
(4) Pressure P of smelting chamber2Is determined
Record P1Then, continuously filling high-purity Ar into the smelting chamber, regulating and controlling the filling amount of the Ar according to different alloy components, and recording the pressure P at the moment through a pressure gauge after the filling is finished2(ii) a At the moment, the pressure difference delta P between the smelting chamber and the suction casting chamber is equal to P2-P1；
(5) Vacuum suction casting
Starting a vacuum mechanical pump of the suction casting chamber, then opening a suction casting valve switch of the suction casting crucible through a pneumatic drawing device controlled by an air compressor, and pouring the alloy liquid into a cavity of the metal mold under the coupling action of self gravity, pressure difference and the suction force of the vacuum mechanical pump.
8. The method for vacuum suction casting of a high melting point, high activity and high purity alloy according to claim 1, wherein the current of the melting power supply is 300 to 1000A before the suction casting valve switch is opened.
9. The method for vacuum suction casting of a high melting point, high activity and high purity alloy as defined in claim 1,characterized in that the suction casting chamber pressure P10.01-0.06 MPa, and regulating and controlling the pressure P of the smelting chamber when the alloy liquid completely seals the micro gap between the smelting chamber and the suction casting chamber20.02-0.80 MPa, and the pressure P of the smelting chamber2Greater than suction casting chamber pressure P1。
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