CN113751717A - Aerosol device and method - Google Patents
Aerosol device and method Download PDFInfo
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- CN113751717A CN113751717A CN202111001462.1A CN202111001462A CN113751717A CN 113751717 A CN113751717 A CN 113751717A CN 202111001462 A CN202111001462 A CN 202111001462A CN 113751717 A CN113751717 A CN 113751717A
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- chamber
- tundish
- smelting
- unit
- inert gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0844—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid in controlled atmosphere
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0888—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid casting construction of the melt process, apparatus, intermediate reservoir, e.g. tundish, devices for temperature control
Abstract
The invention discloses an air atomization device and a method thereof, which relate to the field of preparing metal powder by vacuum air atomization, and the air atomization device comprises: a smelting chamber; the auxiliary bin is arranged beside the smelting chamber; the supporting frame can rotate around the rotating shaft and is arranged in the smelting chamber and the auxiliary chamber; the tundish units are arranged on the support frame and are circumferentially distributed around the rotating shaft, and the tundish units can move into the smelting chamber and the auxiliary bin chamber under the rotation of the support frame; a melting crucible disposed in the melting chamber, for heating and melting the metal raw material and pouring the molten metal into a tundish unit located in the melting chamber; the gas atomization device at least has the following working positions: one tundish unit is located in the smelting chamber and the other tundish unit is located in the auxiliary chamber. This application can be solved the water conservancy diversion mouth and receive long-time high temperature and wash the problem of back fracture inefficacy.
Description
Technical Field
The invention relates to the field of metal powder preparation by vacuum gas atomization, in particular to a gas atomization device and a method thereof.
Background
The raw materials of the metal 3D printing technology are metal powder with a certain particle size range, and the metal powder is required to be pure in chemical components, low in oxygen content, high in powder sphericity and good in flowability. The principle of the method is that a certain raw material is filled into a crucible, the metal raw material is inductively heated and melted by using medium-frequency electricity, the metal raw material is poured into a tundish, a molten metal with a certain diameter flows out from a flow guide nozzle below the tundish, the molten metal is smashed and atomized into tiny metal droplets under the action of high-pressure inert gas, and the required metal powder can be obtained after flying and cooling.
At present, the highest charge of domestic vacuum induction melting gas atomization equipment is 300kg, on one hand, the longest bearing time is about 30min because refractory materials such as a flow guide nozzle are washed by high-temperature melt, and if the atomization time is continuously prolonged, the flow guide nozzle can be broken to cause heavy dangers such as back spray and the like of atomization; on the other hand, the atomization time is too long, so that the risk of blocking the tundish is increased, which is commonly called as 'blockage'. If the phenomenon of 'blockage' occurs, the furnace can only wait for about 1 hour, and after the metal liquid in the crucible is cooled and solidified, the furnace is taken out and replaced by a new tundish, and vacuumizing and argon backfilling are carried out again, so that the production efficiency is greatly reduced and the production cost is increased. Moreover, the oxygen content of the final finished product is higher after the smelting chamber is opened and the oxygen contacts the molten metal, namely the product quality is seriously reduced and even the product can only be discarded. In addition, domestic gas atomizing equipment generally uses single tundish unit, namely single spray disk and guiding nozzle specification, after the tundish is installed and vacuumized, atomization can only be smooth or the atomization fails midway, and the aim of maximizing the benefit of each furnace (on the premise of smooth atomization, the highest yield of powder at a target section) by changing the spray disk and the guiding nozzle specification midway cannot be achieved, namely the high-flexibility target of the atomization process cannot be achieved. Therefore, how to realize high capacity and high flexibility of the gas atomization device so as to greatly improve the production efficiency, the atomization success rate and the process adjustability is a difficult problem to be solved at present.
Disclosure of Invention
In order to overcome the above defects in the prior art, embodiments of the present invention provide an aerosolization device and a method thereof, which can solve the problem of fracture and failure of a flow guide nozzle after being subjected to long-term high-temperature washing.
The specific technical scheme of the embodiment of the invention is as follows:
an aerosolization device, the aerosolization device comprising:
a smelting chamber;
the auxiliary bin is arranged beside the smelting chamber;
a support frame rotatable about an axis, the support frame disposed in the melting chamber and the auxiliary bin;
the tundish units are arranged on the supporting frame and are circumferentially distributed around the axis, and the tundish units can move into the smelting chamber and the auxiliary bin chamber under the rotation of the supporting frame;
a melting crucible provided in the melting chamber for heating and melting a metal raw material and pouring the molten metal into the tundish unit located in the melting chamber;
the gas atomization device at least has the following working positions: one of the tundish units is located in the smelting chamber and the other tundish unit is located in the auxiliary chamber.
Preferably, the gas atomization device comprises a vacuum-pumping unit for vacuum-pumping the auxiliary chamber and the smelting chamber.
Preferably, a common side wall is arranged between the auxiliary bin and the smelting chamber, a first bin door is arranged on the common side wall, and when the first bin door is opened, the supporting frame rotates to enable at least one tundish unit to be switched between the auxiliary bin and the smelting chamber through the first bin door.
Preferably, the support frame comprises a rotation center connected with the driving mechanism and a plurality of support arms extending along the radial direction, one end of each support arm is connected with the rotation center, and the other end of each support arm is provided with one tundish unit.
Preferably, a gas flow passage is formed in the support arm, the tundish unit comprises a spray plate, and the gas flow passage is communicated with the spray plate; the aerosolization device further comprises: a plurality of first inert gas pipes respectively connected to the gas flow passages in the support frame, each of the first inert gas pipes being provided with a first open/close valve.
Preferably, a support wheel capable of rolling is mounted at the lower end of each support arm, and the aerosol device further comprises: the guide rail is arranged in the smelting chamber and is circular, and the supporting wheels are arranged on the guide rail.
Preferably, the upper end surface of the auxiliary chamber is provided with a second chamber door capable of being opened.
Preferably, the aerosolization device further comprises: a second inert gas pipeline communicated with the auxiliary chamber, wherein a second opening and closing valve is arranged on the second inert gas pipeline;
and the third inert gas pipeline is communicated with the smelting chamber, and a third opening and closing valve is arranged on the third inert gas pipeline.
Preferably, the aerosolization device further comprises:
a drive mechanism, comprising: a motor; a first bevel gear connected to an output shaft of the motor; the first bevel gear is meshed with the second bevel gear; and the second gear is connected with the rotating central part through a second rotating shaft and is meshed with the first gear.
A method of aerosolization using an aerosolization device as in any one of the above, the method of aerosolization comprising:
vacuumizing the smelting chamber and introducing inert gas;
after inert gas is introduced, heating and melting the metal raw material in the melting crucible into molten metal;
introducing inert gas into a spray tray of a tundish unit to be poured into the smelting crucible, and pouring molten metal in the smelting crucible into the tundish unit to realize atomization of the molten metal;
adjusting the parameters of another tundish unit in an auxiliary chamber according to the atomization condition of the molten metal in the tundish unit, vacuumizing the auxiliary chamber after the adjustment is finished, and then introducing inert gas;
after atomization reaches a preset time, stopping pouring the smelting crucible, and then rotating the support frame to enable the other tundish unit in the auxiliary bin to move to the position, in the smelting chamber, where the smelting crucible is poured;
and introducing inert gas into a spray plate of the other tundish unit to be poured from the smelting crucible, and pouring molten metal in the smelting crucible into the other tundish unit to realize atomization of the molten metal.
The technical scheme of the invention has the following remarkable beneficial effects:
1. the gas atomization device in this application can be lieing in one in the smelting chamber the atomizing time of middle package unit reaches after presetting the time, stop to smelt empting of crucible, the rotation through the support frame is with other middle package units remove to the position department of empting of smelting the crucible to the realization is smelted and is emptyd in continuation of crucible, continue atomizing through another middle package unit, so, constantly circulate, thereby realize atomizing in turn, prevent that the water conservancy diversion mouth in the middle package unit from receiving long-time high temperature and erodeing back fracture inefficacy, finally prolong atomizing time, realize the large capacity of smelting the crucible.
2. If the tundish unit fails during atomization, the tundish unit can be moved into the auxiliary bin through the support frame, and the tundish unit which fails in the auxiliary bin is maintained while the tundish unit is atomized in the smelting chamber, so that the production efficiency is greatly improved.
3. Finally, parameters of the tundish unit in the auxiliary bin can be adjusted according to the atomization condition of the tundish unit in the smelting chamber, and then the tundish unit is moved into the smelting chamber through the support frame to be atomized, so that the metal liquid in one pot of the smelting crucible can continuously change the specification of the spray disk, the specification of the flow guide nozzle, the pressure of inert gas used for atomization and the like in the atomization process to realize the maximization of the benefit of each furnace, namely the high-flexibility target of the atomization process is realized.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case.
FIG. 1 is a schematic diagram of the mechanism of an aerosolization device in an embodiment of the present invention;
FIG. 2 is an enlarged partial schematic view of an aerosolization device in an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a support frame according to an embodiment of the present invention;
FIG. 4 is a schematic view of the structure of the support wheels and the guide rails according to the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a tundish unit in the embodiment of the present invention.
Reference numerals of the above figures:
1. a smelting chamber; 2. an auxiliary bin; 21. a second bin gate; 3. smelting a crucible; 4. a tundish unit; 401. a tundish heater; 402. a graphite sleeve; 403. a graphite small sleeve; 404. a flow guide nozzle; 405. heating the cap; 406. a tundish; 407. spraying a disc; 5. a support frame; 51. a rotation center portion; 52. a support arm; 521. a gas flow channel; 53. a support wheel; 6. a vacuum pumping unit; 61. a mechanical pump; 62. a roots pump; 7. a first bin gate; 8. a first inert gas conduit; 81. a first opening/closing valve; 9. a guide rail; 10. a second inert gas conduit; 101. a second opening/closing valve; 11. a third inert gas conduit; 111. a third opening and closing valve; 12. a drive mechanism; 121. a motor; 122. a first bevel gear; 123. a second bevel gear; 124. a first gear; 125. a second gear; 13. an atomization chamber; 14. a cyclone separator; 15. a powder collecting tank; 16. a dust remover; 17. a high pressure fan; 18. a first on-off valve; 19. a second on-off valve; 20. a third shutoff valve; 22. a baffle; 23. a proximity switch; 24. a fourth opening valve; 25. a fifth opening/closing valve.
Detailed Description
The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In order to solve the problem that the flow guiding nozzle is broken and fails after being washed by high temperature for a long time, an air atomization device is provided in the application, fig. 1 is a schematic mechanism diagram of the air atomization device in the embodiment of the present invention, fig. 2 is a partially enlarged schematic diagram of the air atomization device in the embodiment of the present invention, fig. 3 is a schematic structural diagram of a support frame in the embodiment of the present invention, and as shown in fig. 1 to 3, the air atomization device may include: a smelting chamber 1; an auxiliary chamber 2 arranged beside the smelting chamber 1; a support frame 5 capable of rotating around an axis, the support frame 5 being provided in the melting chamber 1 and the auxiliary chamber 2; the tundish units 4 are arranged on the support frame 5, the tundish units 4 are circumferentially distributed around the axis, and the tundish units 4 can move into the smelting chamber 1 and the auxiliary bin 2 under the rotation of the support frame 5; a melting crucible 3 provided in the melting chamber 1 for heating and melting a metal raw material and pouring the molten metal into a tundish unit 4 located in the melting chamber 1; the gas atomization device at least has the following working positions: one tundish unit 4 is located in the smelting chamber 1 and the other tundish unit 4 is located in the auxiliary chamber 2.
Gas atomizing device in this application can reach after presetting the time in the atomizing time that is arranged in smelting room 1 a tundish unit 4, stop smelting pouring of crucible 3, the rotation through support frame 5 removes other tundish units 4 to smelting crucible 3's position department of empting, thereby realize smelting crucible 3's continuation and toppling over, continue atomizing through another tundish unit 4, thus, constantly circulate, thereby realize atomizing in turn, prevent that water conservancy diversion mouth 404 in the tundish unit 4 from receiving fracture failure after long-time high temperature erodees, finally prolong atomizing time, realize smelting crucible 3's large capacity. Meanwhile, if the tundish unit 4 fails during atomization, the tundish unit 4 can be moved into the auxiliary chamber 2 through the support frame 5, and the tundish unit 4 which fails in the auxiliary chamber 2 is maintained while the tundish unit 4 in the smelting chamber 1 is atomized, so that the production efficiency is greatly improved. Finally, parameters of the tundish unit 4 in the auxiliary bin 2 can be adjusted according to the atomization condition of the tundish unit 4 in the smelting chamber 1, and then the molten metal is moved into the smelting chamber 1 through the support frame 5 for atomization, so that the maximization of the benefit of each furnace is realized by continuously changing the specification of the spray disc 407, the specification of the flow guide nozzle 404, the pressure of inert gas used for atomization and the like of one pot of molten metal in the smelting crucible 3 in the atomization process, namely the high-flexibility target of the atomization process is realized.
As shown in fig. 1, the aerosolization device can comprise: a smelting chamber 1, an auxiliary bin 2, a support frame 5, a plurality of tundish units 4, a smelting crucible 3 and the like. Wherein, smelting crucible 3 is set up in smelting chamber 1, and smelting crucible 3 can use large capacity specification. The melting crucible 3 is used for accommodating metal raw materials, the metal raw materials are heated through medium-frequency electricity to be melted into molten metal, and the heating power can be determined according to actual needs. The melting crucible 3 can be poured with the aid of auxiliary machinery, so that the molten metal is poured into a tundish unit 4 located in the melting chamber 1 in the pouring position.
As shown in fig. 1, the auxiliary chamber 2 is disposed beside the melting chamber 1, and both are located in the same horizontal direction. It is possible to have a common side wall between the auxiliary chamber 2 and the smelting chamber 1, the common side wall having a first door 7.
As shown in fig. 1, a support frame 5 is provided in the melting chamber 1 and the auxiliary chamber 2. Part of the support frame 5 is located in the smelting chamber 1 and part of the support frame 5 is located in the auxiliary chamber 2. As shown in fig. 2, a plurality of tundish units 4 are provided on the support frame 5, the plurality of tundish units 4 are circumferentially distributed around the axis, and the tundish units 4 can be moved into the melting chamber 1 and the auxiliary chamber 2 by the rotation of the support frame 5. As a possibility, the tundish units 4 may be two, which may be symmetrically arranged; the number of the tundish units 4 can be three, and the adjacent tundish units 4 can be adjacent to each other at an included angle of 120 degrees; the number of the tundish units 4 may be four or more.
As shown in fig. 1, the gas atomizing device has at least one operating position in which one tundish unit 4 is located in the smelting chamber 1 and another tundish unit 4 is located in the auxiliary chamber 2. The tundish unit 4 in the melting chamber 1 can be positioned at the pouring position of the melting crucible 3 to receive molten metal poured from the melting crucible 3, so as to realize atomization of the molten metal. The tundish unit 4 located in the auxiliary bin 2 can adjust parameters of the tundish unit, the parameters can include the specification of the spray plate 407, the specification of the flow guide nozzle 404, the pressure of inert gas used for atomization and the like, the tundish unit 4 with faults can be maintained, and after the maintenance is completed, the tundish unit 4 is switched to the smelting chamber 1 through the support frame 5, so that the atomization operation can be continued.
As shown in fig. 1, when the first door 7 is opened, the support frame 5 is rotated to switch at least one tundish unit 4 between the auxiliary chamber 2 and the melting chamber 1 through the first door 7. The number of the first doors 7 may be one or two. When there is one first door 7, the first door 7 is large, which is required to ensure that the tundish unit 4 located in the auxiliary chamber 2 is moved out to the melting chamber 1 and the tundish unit 4 located in the melting chamber 1 is moved out to the auxiliary chamber 2 when the supporting frame 5 is rotated. When the number of the first bin gates 7 is two, the first bin gates 7 are separated by a certain distance, when the support frame 5 rotates, the tundish unit 4 in the auxiliary bin 2 is moved out to the smelting chamber 1 through one first bin gate 7, and the tundish unit 4 in the smelting chamber 1 is moved out to the auxiliary bin 2 through the other first bin gate 7.
As shown in fig. 1, the auxiliary chamber 2 has a second door 21 that can be opened on an upper end surface thereof. When the tundish unit 4 in the smelting chamber 1 is undergoing the atomizing process, the second door 21 may be opened to perform a corresponding operation on the tundish unit 4 in the auxiliary chamber 2 when maintenance or parameter adjustment is required on the tundish unit 4 in the auxiliary chamber 2. After the re-operation is completed, the gas in the auxiliary chamber 2 is again treated to be replaced with an inert gas. In the atomization process, parameters of the tundish unit 4 in the auxiliary chamber 2 are adjusted and maintained in real time, so that the production efficiency, the atomization success rate and the process adjustability can be greatly improved, the manufacturing cost is reduced, and the purposes of high capacity and high flexibility of the gas atomization equipment are finally achieved.
As shown in fig. 2 and 3, the entire support frame 5 may be a solid of revolution. As a possibility, the support frame 5 may comprise a rotational central portion 51 connected to the drive mechanism 12, a plurality of support arms 52 extending in radial direction. The rotation center 51 has a through hole, and a second rotation shaft is inserted into the through hole to be in transmission connection with the driving mechanism 12. The support arms 52 are circumferentially distributed around the central rotation portion 51, and preferably, in order to secure the balance of the supporting frame 5, the support arms 52 are uniformly circumferentially distributed around the central rotation portion 51. One end of each support arm 52 is connected to the rotation center portion 51, and the other end of each support arm 52 is provided with one tundish unit 4.
As shown in fig. 3, a gas flow passage 521 is opened in the support arm 52, and the gas flow passage 521 communicates with the spray plate 407 in the tundish unit 4. As shown in fig. 1 and 2, the aerosolization device can comprise: a plurality of first inert gas pipes 8, the plurality of first inert gas pipes 8 being connected one-to-one with the plurality of gas flow passages 521 in the support frame 5, respectively, each first inert gas pipe 8 being provided with a first open/close valve 81. By controlling the first opening and closing valve 81 on each first inert gas pipe 8, it is possible to control the inert gas to enter the different gas flow passages 521 on the support arm 52, respectively, and thus to the spray plate 407 of the tundish unit 4 at different positions on the support arm 52.
As shown in fig. 2, the aerosolization apparatus may comprise: a drive mechanism 12, comprising: a motor 121; a first bevel gear 122 connected to an output shaft of the motor 121; a second bevel gear 123 and a first gear 124 which are connected together through a first rotating shaft, wherein the first bevel gear 122 is meshed with the second bevel gear 123; the second gear 125 connected to the rotation center part 51 by a second rotation shaft, and the second gear 125 is engaged with the first gear 124. For example, the reduction ratio between the first bevel gear 122 and the second bevel gear 123 may be controlled at 10:1 to 100: 1, the reduction ratio between the first gear 124 and the second gear 125 can be controlled between 5:1 to 50: 1. Through the structure, on one hand, a large reduction ratio can be realized, on the other hand, the output shaft of the motor 121 can be transversely arranged, so that the motor 121 is convenient to fix and arrange, meanwhile, the overall height of the driving mechanism 12 in the vertical direction is reduced, the driving mechanism is convenient to install in the smelting chamber 1, and the layout of other mechanisms is not influenced. A proximity switch 23 is provided near the tilting position of the tundish unit 4, and when the proximity switch 23 detects that the tundish unit 4 is rotated to the tilting position, the control motor 121 stops rotating.
Fig. 4 is a schematic structural view of the support wheels and the guide rail in the embodiment of the present invention, and as shown in fig. 2 and 4, a support wheel 53 capable of rolling is mounted on the lower end of each support arm 52. The aerosolization device can comprise: a guide rail 9 arranged in the smelting chamber 1, the guide rail 9 being circular, the support wheels 53 being arranged on the guide rail 9. With the above-described structure, the support of the weight of the support arm 52 and the tundish unit 4 is achieved by means of the support wheel 53, while the rotation of the support arm 52 is facilitated. As shown in fig. 4, the support wheel 53 may have a groove, and the guide rail 9 may have a projection matching the groove. Through the mechanism, the stability and the concentricity of the supporting arm 52 in the rotating process can be realized, so that the stable atomization of the molten metal is realized.
As shown in fig. 1, the gas atomization device may include an atomization chamber 13, the atomization chamber 13 and the smelting chamber 1 are arranged in parallel, the atomization chamber 13 is communicated with the smelting chamber 1, and the atomization chamber 13 is located below the smelting chamber 1. The atomizing chamber 13 is located below the tundish unit 4, which is poured by the melting crucible 3 in the melting chamber 1, to receive the metal powder generated by atomization. The upper end inlet of the tundish unit 4 communicates with the interior of the melting chamber 1, and the lower end outlet thereof communicates with the interior of the atomizing chamber 13. As shown in fig. 1, a baffle plate 22 is provided above the connection between the atomizing chamber 13 and the melting chamber 1. The guide plate 22 is positioned in the smelting chamber 1, the horizontal cross section of the guide plate 22 is circular, and the smelting chamber 1 is used for introducing metal powder generated by atomization of the tundish unit 4 into the atomizing chamber 13 to prevent the metal powder from entering the smelting chamber 1.
As a practical matter, a vacuum gauge may be embedded in the middle of the outer side wall of the atomizing chamber 13, and a monitoring end of the vacuum gauge is disposed toward the inside of the atomizing chamber 13.
As shown in fig. 1 and 2, the lower end of the atomizing chamber 13 is in sealed communication with the input end of the cyclone 14, the lower end of the cyclone 14 is connected to a powder collection tank 15, and a first on-off valve 18 is provided between the powder collection tank 15 and the lower end of the cyclone 14. The gas outlet of the cyclone 14 is hermetically connected with the dust remover 16, and a second cut-off valve 19 is arranged between the gas outlet of the cyclone 14 and the dust remover 16. The lower end of the dust remover 16 is also connected with a powder collecting tank 15, and a third stop valve 20 is arranged between the lower end of the dust remover 16 and the powder collecting tank 15. The dust collector 16 is hermetically communicated with a high-pressure fan 17, and metal powder required to be generated is collected through the powder collecting tank 15 under the suction action of the fan.
As shown in fig. 1, the aerosolization device can comprise: a second inert gas pipe 10 communicated with the auxiliary chamber 2, a second on-off valve 101 being provided on the second inert gas pipe 10; and a third inert gas pipeline 11 communicated with the smelting chamber 1, wherein a third opening and closing valve 111 is arranged on the third inert gas pipeline 11.
As shown in fig. 1, the gas atomization apparatus may include an evacuation unit 6 for evacuating the auxiliary chamber 2 and the melting chamber 1. The evacuation unit 6 can communicate with the auxiliary chamber 2, which can also communicate with the melting chamber 1. Since the melting chamber 1 is in communication with the atomizing chamber 13, the evacuation unit 6 can be in direct communication with the atomizing chamber 13. The evacuation unit 6 communicates with the auxiliary chamber 2 through a line provided with a fourth opening/closing valve 24, and the evacuation unit 6 communicates with the atomizing chamber 13 or the melting chamber 1 through a line provided with a fifth opening/closing valve 25. In order to increase the degree of vacuum drawn by the evacuation unit 6, the evacuation unit 6 may include a roots pump 62 and a mechanical pump 61. The mechanical pump 61 is connected with a roots pump 62, and the roots pump 62 can be communicated with the auxiliary bin 2 and the atomizing chamber 13 or the smelting chamber 1 respectively through pipelines. When the vacuumizing unit 6 vacuumizes the auxiliary bin 2 and/or the smelting chamber 1, introducing inert gas into the auxiliary bin 2 through a second inert gas pipeline 10; and then the inert gas is introduced into the smelting chamber 1 through a third inert gas pipeline 11, so that the situation that the oxygen content of the metal powder of a final finished product is higher due to the fact that oxygen contacts molten metal and the quality of the product is seriously reduced is prevented.
The gas atomization method of the gas atomization device in the application can comprise the following steps:
the melting crucible 3 is charged with metal raw materials, a desired tundish unit 4 is mounted on a support frame 5, and an appropriate spray plate 407 and a suitable deflector 404 are selected. The same specification of spray disk 407 and diversion nozzle 404 may be used for apportioned volume production, or different specifications of spray disk 407 and diversion nozzle 404 may be used for process gradient tests. The size of the circular seam of the spray plate 407 can be selected to be between 0.4mm and 1.8mm, and the diameter of the diversion nozzle 404 can be selected to be between 3mm and 8 mm.
The lid of the melting chamber 1 and the second door 21 of the auxiliary chamber 2 are closed. Vacuumizing the smelting chamber 1, introducing inert gas, for example, vacuumizing the smelting chamber 1 to 1Pa to 20Pa, closing the vacuumizing unit 6, introducing inert gas such as argon through a third inert gas pipeline 11, until 99.999% of high-purity inert gas is introduced into the smelting chamber 1, and stopping gas filling when the internal pressure of the equipment is 100kPa to 103 kPa. In the process, a first bin gate 7 between the smelting chamber 1 and the auxiliary bin 2 can be opened, so that the smelting chamber 1 and the auxiliary bin 2 are in a communication state; it is also possible to close the first door 7 between the melting chamber 1 and the auxiliary chamber 2, to evacuate the melting chamber 1 and to introduce inert gas.
The motor 121 is started, the support frame 5 is driven to rotate through the driving mechanism 12, the rotating speed can be 1r/min to 100r/min, when the tundish unit 4 reaches the position right above the guide plate 22, the proximity switch 23 gives a signal, and the motor 121 stops. The metal raw material in the melting crucible 3 is heated and melted into molten metal. Specifically, the melting crucible 3 is turned on to heat the metal raw material by a medium frequency power, for example, a medium frequency power may be set to 100kw to 500 kw. Meanwhile, the power supply of the tundish unit 4 can be turned on, for example, the power is 10kw to 40kw, so that the tundish 406 and the flow guide nozzle 404 have certain temperatures, and the molten metal is prevented from being blocked during atomization.
Inert gas is introduced into the spray plate 407 of the tundish unit 4 to be poured into the melting crucible 3, and the molten metal in the melting crucible 3 is poured into the tundish unit 4 to achieve atomization of the molten metal. Specifically, the temperature of the molten metal in the crucible 3 to be melted and the temperature of the inner wall of the tundish 406 reach the process requirement values, the high-pressure fan 17 and the second cut-off valve 19 are opened, the first on-off valve 81 of the first inert gas pipe 8 corresponding to the tundish unit 4 positioned right above the guide plate 22 is opened, the crucible is poured, atomization is started, the atomization pressure can be 3MPa to 5MPa, and the molten metal position in the tundish unit 4 is constantly ensured to be between 1/3 and 1/2 of the total height.
If the apportioned capacity production is carried out, a plurality of identical tundish units 4 are respectively installed on the support frame 5 before the materials are loaded, after the first tundish unit 4 is atomized for a preset time, generally after 10min to 15min, the melting crucible 3 is stopped to dump, the first open-close valve 81 of the first inert gas pipeline 8 corresponding to the first tundish unit 4 is closed, and the motor 121 is started to drive the support frame 5 and the tundish unit 4 to rotate; after the second tundish unit 4 reaches the position right above the guide plate 22, the proximity switch 23 gives a signal, the motor 121 stops, the first on-off valve 81 of the first inert gas pipeline 8 corresponding to the second tundish unit 4 is opened, the smelting crucible 3 is poured to continue the atomization process, and the process is circulated until the atomization of the molten metal in the smelting crucible 3 is finished.
If a process gradient test is carried out, a plurality of tundish units 4 with different specifications are respectively arranged on the support frame 5 before charging, parameters of a second tundish unit 4 in the auxiliary bin 2, such as the specification of a spray disc 407, the diameter of a flow guide nozzle 404, the atomizing pressure and the like, can be adjusted in real time according to the atomizing condition of a first tundish unit 4 in the smelting chamber 1, after the adjustment is finished, the auxiliary bin 2 is vacuumized, and then inert gas is introduced. The method specifically comprises the following steps:
closing a first bin gate 7 between the smelting chamber 1 and the auxiliary bin 2, opening a second bin gate 21 right above the auxiliary bin 2, disassembling and replacing parameters of a tundish unit 4 in the auxiliary bin 2, and closing the bin gate right above; the vacuumizing unit 6 and the fourth opening/closing valve 24 are opened, the auxiliary chamber 2 is independently vacuumized, and the power supply of the tundish unit 4 in the auxiliary chamber 2 is simultaneously turned on; when the vacuum degree in the auxiliary chamber 2 reaches 1Pa to 10Pa, a second opening and closing valve 101 on a second inert gas pipeline 10 can be opened for inert gas backfilling, and after the pressure of the auxiliary chamber 2 is 100kPa to 103kPa, a first chamber door 7 between the smelting chamber 1 and the auxiliary chamber 2 is opened; after the first tundish unit 4 is atomized for a preset time, generally after 10min to 15min, stopping pouring the smelting crucible 3, closing the first on-off valve 81 of the first inert gas pipeline 8 corresponding to the first tundish unit 4, and starting the motor 121 to drive the support frame 5 and the tundish unit 4 to rotate; after the other tundish unit 4 originally located in the auxiliary chamber 2 reaches the position right above the guide plate 22, the proximity switch 23 gives a signal, the motor 121 is stopped, the first on-off valve 81 of the first inert gas pipeline 8 corresponding to the other tundish unit 4 is opened, inert gas is introduced into the spray plate 407 of the other tundish unit 4 to be poured in the melting crucible 3, and molten metal in the melting crucible 3 is poured into the other tundish unit 4 to realize atomization of the molten metal.
By analogy, the tundish units 4 of different specifications can be replaced in real time, and even if the 'bag blockage' phenomenon occurs, the tundish units 4 can be replaced in real time by using the same method, so that the molten metal in the smelting crucible 3 is completely atomized, and high-flexibility production of high-capacity gas atomization equipment is realized.
After the atomization of the molten metal is completed, the first on-off valve 81, the second on-off valve 19, and the high pressure fan 17 of the first inert gas line 8 may be closed, the melting crucible 3 is stopped from pouring, and the gas atomization apparatus is ready to discharge powder.
Example 1
Adopt this application preparation 3D to print with 316L powder, specific process is: 1t of 316L bar raw material is filled into a smelting crucible 3, a plurality of spray disks 407 and diversion nozzles 404 with the same specification are mounted on a support frame 5 for apportioned capacity production, the spray disks 407 are of parallel circular seam structures, the circular seam size is 0.8mm, and the diameter of a discharge spout is 5 mm; closing the furnace cover of the smelting chamber 1 and a second bin gate 21 of the auxiliary bin 2, and opening a first bin gate 7 between the smelting chamber 1 and the auxiliary bin 2 to realize the communication state between the smelting chamber 1 and the auxiliary bin 2; vacuumizing the smelting chamber 1, and introducing inert gas; the motor 121 is started, the support frame 5 is driven to rotate through the driving mechanism 12, and after the tundish unit 4 reaches the position right above the guide plate 22, the proximity switch 23 gives a signal, and the motor 121 stops. Starting medium-frequency power of a melting crucible 3, wherein the medium-frequency power is 280kw, and heating metal raw materials; the power supply of the tundish unit 4 is started, the power is 25kw, the tundish 406 and the flow guide nozzle 404 are ensured to have certain temperature, and molten steel blockage during atomization is prevented; when the temperature of molten steel in the smelting crucible 3 reaches 1620 +/-20 ℃ and the temperature of the inner wall of the tundish 406 is more than or equal to 1200 ℃, starting the high-pressure fan 17 and the second cut-off valve 19, opening the first open-close valve 81 of the first inert gas pipeline 8 corresponding to the tundish unit 4 positioned right above the guide plate 22, pouring the crucible, and starting atomization, wherein the atomization pressure can be 4.2MPa, so that the molten steel in the tundish unit 4 is constantly ensured to be between 1/3 and 1/2 of the total height; after the first tundish unit 4 is atomized for 14min, the melting crucible 3 stops pouring, the first set of inert gas hand valve is closed, and the starting motor 121 drives the support frame 5 and the tundish unit 4 to rotate. Closing the first on-off valve 81 of the first inert gas pipeline 8 corresponding to the first tundish unit 4, and starting the motor 121 to drive the support frame 5 and the tundish unit 4 to rotate; after the second tundish unit 4 reaches the position right above the guide plate 22, the proximity switch 23 gives a signal, the motor 121 stops, the first on-off valve 81 of the first inert gas pipeline 8 corresponding to the second tundish unit 4 is opened, the atomization pressure is 4.2MPa, the smelting crucible 3 is poured to continue the atomization process, and the process is circulated until the atomization of the molten metal in the smelting crucible 3 is finished; after the atomization of the molten metal is completed, the first on-off valve 81, the second on-off valve 19, and the high pressure fan 17 of the first inert gas line 8 may be closed, the melting crucible 3 is stopped from pouring, and the gas atomization apparatus is ready to discharge powder.
Example 2
Adopt this application preparation 3D to print with COCRMO powder, concrete process is: 1t of CoCrMo bar raw material is filled into the melting crucible 3; closing the furnace cover of the smelting chamber 1 and a second bin gate 21 of the auxiliary bin 2, and opening a first bin gate 7 between the smelting chamber 1 and the auxiliary bin 2 to realize the communication state between the smelting chamber 1 and the auxiliary bin 2; vacuumizing the smelting chamber 1, and introducing inert gas; the motor 121 is started, the support frame 5 is driven to rotate through the driving mechanism 12, and after the tundish unit 4 reaches the position right above the guide plate 22, the proximity switch 23 gives a signal, and the motor 121 stops. Starting a smelting crucible 3 to perform medium-frequency power, wherein the medium-frequency power is 300kw, and heating a metal raw material; the power supply of the tundish unit 4 is started, the power is 30kw, the tundish 406 and the flow guide nozzle 404 are ensured to have certain temperature, and molten steel blockage during atomization is prevented; when the temperature of molten steel in the crucible 3 to be smelted reaches 1680 +/-20 ℃ and the temperature of the inner wall of the tundish 406 is more than or equal to 1250 ℃, starting the high-pressure fan 17 and the second cut-off valve 19, opening the first open-close valve 81 of the first inert gas pipeline 8 corresponding to the tundish unit 4 positioned right above the guide plate 22, pouring the crucible, and starting atomization, wherein the atomization pressure can be 4.5MPa, so that the molten steel in the tundish unit 4 is constantly ensured to be positioned between 1/3 and 1/2 of the total height; the first tundish unit 4 was used, the size of the circumferential seam was 0.6mm, the diameter of the nozzle 404 was 6mm, and the atomization was normal. After the first tundish unit 4 is atomized for 8min, the melting crucible 3 stops pouring, the first set of inert gas hand valve is closed, and the starting motor 121 drives the support frame 5 and the tundish unit 4 to rotate. Closing the first on-off valve 81 of the first inert gas pipeline 8 corresponding to the first tundish unit 4, and starting the motor 121 to drive the support frame 5 and the tundish unit 4 to rotate; after the second tundish unit 4 reaches the position right above the guide plate 22, the proximity switch 23 gives a signal, the motor 121 stops, the first on-off valve 81 of the first inert gas pipeline 8 corresponding to the second tundish unit 4 is opened, the atomizing pressure is 4.5MPa, the circular seam size of the second tundish unit 4 is 0.9mm, the diameter of the nozzle is 5mm, and the atomization is normal. After stable atomization is carried out for 8min, the melting crucible 3 stops pouring, the first opening and closing valves 81 of the first inert gas pipelines 8 corresponding to the two tundish units 4 are closed, and the starting motor 121 drives the support frame 5 and the tundish units 4 to rotate. Using the third tundish unit 4 having a circular gap size of 1.2mm and a tip diameter of 4mm, if the atomization 30S is clogged, the first opening/closing valve 81 of the first inert gas line 8 corresponding to the third tundish unit 4 is closed to stop the pouring of the melting crucible 3, and then the tundish unit 4 is replaced by: closing a first bin gate 7 between the smelting chamber 1 and the auxiliary bin 2, opening a second bin gate 21 right above the auxiliary bin 2, disassembling and replacing the first tundish unit 4, wherein the circular seam of the spraying disc 407 is 0.9mm after replacement, the diameter of the discharge spout is 4mm, and closing the second bin gate 21; the vacuumizing unit 6 and the fourth opening valve 24 are opened, the auxiliary chamber 2 is vacuumized independently, and the power supply of the tundish unit 4 in the auxiliary chamber 2 is opened at the same time, wherein the power supply is 30 kw; when the vacuum degree in the auxiliary chamber 2 reaches 1Pa to 10Pa, a second opening and closing valve 101 on a second inert gas pipeline 10 can be opened for inert gas backfilling, and after the pressure of the auxiliary chamber 2 is 100kPa to 103kPa, a first chamber door 7 between the smelting chamber 1 and the auxiliary chamber 2 is opened; the starting motor 121 drives the supporting frame 5 and the tundish unit 4 to rotate, after the first tundish unit 4 reaches the position right above the guide plate 22, the proximity switch 23 gives a signal, the motor 121 stops, the first on-off valve 81 of the first inert gas pipeline 8 corresponding to the first tundish unit 4 is opened, inert gas is introduced into the spray tray 407 of the first tundish unit 4 to be poured in the smelting crucible 3, molten metal in the smelting crucible 3 is poured into the first tundish unit 4 to realize atomization of the molten metal, stable and normal atomization is found, and the atomization time is 17 min. After the atomization of the molten metal is completed, the first on-off valve 81, the second on-off valve 19, and the high pressure fan 17 of the first inert gas line 8 may be closed, the melting crucible 3 is stopped from pouring, and the gas atomization apparatus is ready to discharge powder.
The conventional aerosolization technique using a single tundish unit 4 is compared with the aerosolization technique of the present application as shown in table 1.
Table 1 comparison of conventional single tundish unit 4 aerosolization technique with that of the present application
The application can achieve the following beneficial effects:
1. be equipped with large capacity melting crucible 3 and set up a plurality of middle package units 4 on support frame 5 in the smelting chamber 1, rotate together with middle package unit 4 through drive support frame 5, realize atomizing in turn, prevent that water conservancy diversion mouth 404 from receiving fracture failure after long-time high temperature erodees, finally prolong the atomizing time, can reach 2 times or more, the technical bottleneck problem of domestic large capacity crucible production has been solved, the time of waiting is smelted to the branch stove time of having reduced, production efficiency has greatly been improved.
2. The support frame 5 is provided with a gas flow channel 521 inside, the first open/close valve 81 on the external first inert gas pipeline 8 is used for respectively controlling the output of the inert gas of the spray disks 407 of different tundish units 4, the pressure of the inert gas can be respectively different, and the current requirement of the atomizing gas can be completely met. Supporting wheel 53 and track are equipped with to support frame 5 bottom, guarantee the concentricity of middle package unit 4 and guide plate 22 through proximity switch 23, guarantee smooth atomizing.
3. An auxiliary chamber 2 is arranged outside the smelting chamber 1, the smelting chamber 1 is sealed through a first chamber door 7, and the proper specification of a spray disc 407 and a flow guide nozzle 404 can be selected for a tundish unit 4 positioned in the auxiliary chamber 2 during atomization through a single vacuumizing pipeline and an inert gas pipeline for supplementing inert gas; then the driving mechanism 12 drives the supporting frame 5 and the tundish unit 4 to rotate, so that the tundish unit 4 positioned in the auxiliary chamber 2 moves to the position right above the guide plate 22 in the smelting chamber 1. The capacity sharing production or the process gradient test can be carried out through the scheme, the capacity that the package blocking can be timely processed and the process adjustment can be carried out in real time when a large-capacity crucible is produced is ensured, the production efficiency, the atomizing success rate and the process adjustability are greatly improved, and the purposes of large capacity and high flexibility of the gas atomizing equipment are achieved.
All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional. A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. An aerosolization device, the aerosolization device comprising:
a smelting chamber;
the auxiliary bin is arranged beside the smelting chamber;
a support frame rotatable about an axis, the support frame disposed in the melting chamber and the auxiliary bin;
the tundish units are arranged on the supporting frame and are circumferentially distributed around the axis, and the tundish units can move into the smelting chamber and the auxiliary bin chamber under the rotation of the supporting frame;
a melting crucible provided in the melting chamber for heating and melting a metal raw material and pouring the molten metal into the tundish unit located in the melting chamber;
the gas atomization device at least has the following working positions: one of the tundish units is located in the smelting chamber and the other tundish unit is located in the auxiliary chamber.
2. The gas atomizing device of claim 1, wherein the gas atomizing device includes an evacuation unit for evacuating the auxiliary chamber and the melting chamber.
3. The aerosolization apparatus of claim 1, wherein the auxiliary chamber and the melting chamber have a common sidewall therebetween, the common sidewall having a first gate thereon, the support frame rotating when the first gate is open to switch at least one of the tundish units between the auxiliary chamber and the melting chamber through the first gate.
4. The aerosolization apparatus of claim 1 wherein the support frame comprises a central portion of rotation coupled to the drive mechanism, a plurality of radially extending support arms, one end of each support arm coupled to the central portion of rotation, the other end of each support arm being provided with one of the tundish units.
5. The aerosolization apparatus of claim 4 wherein the support arm has a gas channel formed therein, the tundish unit comprising a spray disk, the gas channel being in communication with the spray disk; the aerosolization device further comprises: a plurality of first inert gas pipes respectively connected to the gas flow passages in the support frame, each of the first inert gas pipes being provided with a first open/close valve.
6. The aerosolization apparatus of claim 4 wherein a lower end of each of the support arms is mounted with a support wheel capable of rolling, the aerosolization apparatus further comprising: the guide rail is arranged in the smelting chamber and is circular, and the supporting wheels are arranged on the guide rail.
7. The aerosolization apparatus of claim 1 wherein the auxiliary chamber has a second openable door on an upper face thereof.
8. The aerosolization device of claim 1, further comprising: a second inert gas pipeline communicated with the auxiliary chamber, wherein a second opening and closing valve is arranged on the second inert gas pipeline;
and the third inert gas pipeline is communicated with the smelting chamber, and a third opening and closing valve is arranged on the third inert gas pipeline.
9. The aerosolization device of claim 4, further comprising:
a drive mechanism, comprising: a motor; a first bevel gear connected to an output shaft of the motor; the first bevel gear is meshed with the second bevel gear; and the second gear is connected with the rotating central part through a second rotating shaft and is meshed with the first gear.
10. An aerosolization method employing an aerosolization device according to any one of claims 1-9, the aerosolization method comprising:
vacuumizing the smelting chamber and introducing inert gas;
after inert gas is introduced, heating and melting the metal raw material in the melting crucible into molten metal;
introducing inert gas into a spray tray of a tundish unit to be poured into the smelting crucible, and pouring molten metal in the smelting crucible into the tundish unit to realize atomization of the molten metal;
adjusting the parameters of another tundish unit in an auxiliary chamber according to the atomization condition of the molten metal in the tundish unit, vacuumizing the auxiliary chamber after the adjustment is finished, and then introducing inert gas;
after atomization reaches a preset time, stopping pouring the smelting crucible, and then rotating the support frame to enable the other tundish unit in the auxiliary bin to move to the position, in the smelting chamber, where the smelting crucible is poured;
and introducing inert gas into a spray plate of the other tundish unit to be poured from the smelting crucible, and pouring molten metal in the smelting crucible into the other tundish unit to realize atomization of the molten metal.
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