Hollow casting body as well as preparation device and preparation method thereof

Abstract

The invention provides a hollow casting body which is an amorphous alloy casting body and comprises a main body structure and a through hole structure contained in the main body structure. The wall thickness of the casting body main body structure ranges from 1.2 mm to 4.0 mm, and the length of the casting body main body structure ranges from 10 mm to 150 mm. The invention further provides a preparation device of the hollow casting body and a preparation method of the hollow casting body, the preparation device comprises a smelting assembly, a forming mold and a blow casting assembly which are arranged in a vacuum bin, and the preparation method comprises the steps that in the vacuum environment, amorphous alloy raw materials are taken and smelted through the smelting assembly, and uniform melt is obtained; and pouring the molten liquid into a forming mold, starting a blow-casting assembly to blow inert airflow into a casting cavity, and adjusting blow-casting parameters to obtain the required hollow casting body. The invention aims to provide a hollow casting tool cast by an amorphous alloy, and aims to solve the technical problem that no proper processing technology is provided for manufacturing an amorphous alloy tubular part in the prior art.

Description

Technical Field

[0001] The invention belongs to the technical field of alloy manufacturing, and in particular relates to a hollow casting body and a preparation device and a preparation method of the hollow casting body. Background Art

[0002] Tubular parts are one of the most commonly used products among all kinds of metal parts. Due to their unique structure and performance, they are widely used in many fields including construction and infrastructure, oil and gas, chemicals and petrochemicals, electricity and energy, automobiles and transportation, aerospace, medical and biotechnology, electronics and semiconductors. The materials, design and preparation methods of tubular parts vary according to specific needs. At present, the materials commonly used for metal tubular parts on the market include stainless steel pipes, aluminum alloy pipes, etc. With the advancement of science and technology in various fields, all walks of life have put forward more detailed requirements for tubular parts of different materials. Among them, amorphous alloy materials have been proven to have great potential in the field of precision components due to their high strength, high hardness, excellent corrosion resistance, biocompatibility and other characteristics. Various structural parts made of amorphous alloys as raw materials are widely used in smart electronic devices, medical devices and other fields.

[0003] At present, the research in the field of amorphous alloys is focused on the development of amorphous material systems and amorphous processing and forming equipment, while there is less research on its processing and forming technology and application basis. In the prior art, the processing method of amorphous structural parts is mostly pressure casting. This process method has a simple process and good product consistency, and has been widely used in the industry. Although the die-casting process is currently the mainstream process for amorphous special-shaped structural parts, it is impossible to prepare components of certain specific shapes, including amorphous tubular parts. The die-casting process cannot be applied to the preparation of amorphous tubular parts. On the one hand, it is difficult to prepare tubular parts with die-casting molds (it is impossible to pull the core after die-casting), and materials such as stainless steel pipes in the prior art are not directly formed by pressure casting; on the other hand, the shape and size of the tubular parts limit the cooling speed and cooling uniformity, making it difficult to make the amorphous tubular parts cool quickly and uniformly, that is, it is impossible to ensure that the amorphous tubular parts are completely amorphous after preparation. Similarly, it is impossible to use extrusion processes or blow molding processes like plastic materials to prepare amorphous tubular parts.

[0004] The Chinese patent application number 201010032501.X entitled "A device and method for forming an amorphous alloy thin-walled slender tube" provides a method for preparing an amorphous tubular part, which uses a suction casting device at the bottom to suck the alloy melt from the top to the bottom. During the suction casting process, the side wall of the mold cavity solidifies first, and the unsolidified melt in the middle of the mold cavity is sucked out by the suction casting device, thereby obtaining a hollow solidified shell. Although the above-mentioned method for preparing an amorphous tubular part is theoretically feasible, from the perspective of actual manufacturing and production, this method is difficult to control the overall cooling rate of the amorphous tubular part, especially the large difference in the cooling rate of the head and tail of the long tube will inevitably cause the tube body to crystallize, and the above-mentioned preparation method does not provide a solution for controlling the thickness of the amorphous tubular part. Summary of the invention

[0005] The purpose of the present invention is to provide a hollow casting made of amorphous alloy, aiming to solve the technical problem that there is no suitable processing technology for manufacturing amorphous alloy tubular parts in the prior art.

[0006] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is as follows: The present invention provides a hollow casting body, which is an amorphous alloy casting body. The casting body comprises a main structure and a through-hole structure contained in the main structure. The wall thickness of the main structure of the casting body is 1.2-4.0 mm and the length is 10-150 mm.

[0007] Preferably, the casting body is an amorphous hollow pipe or an amorphous hollow shaft; the outer diameter of the casting body is 5-20 mm.

[0008] The hollow casting body provided in the present invention has the advantage that the preparation of the pore structure can be realized in the process stage of amorphous forming. In the prior art, the pore structure of amorphous products is either small and shallow, which is realized by the design of the die-casting process, and the die-casting process itself cannot realize the preparation of long holes, deep holes, and arbitrary holes. In addition, the pore structure of amorphous products can only be processed by using tools such as turning tools and CNC after processing the amorphous blank, and its processing feasibility is seriously restricted by the secondary processing method.

[0009] The hollow casting body provided in the present invention can prepare a through-hole structure while forming an amorphous main structure, and is particularly suitable for preparing amorphous parts with a main structure wall thickness of 1.2-4.0 mm and a length of 10-150 mm. The above wall thickness and length data are subject to the forming ability of existing amorphous materials and the cooling rate during the forming process. If the wall thickness of the main structure is too large, it is easy to cause uneven heat dissipation. If the length is too long, it is also easy to cause uneven heat dissipation, resulting in partial crystallization of the product and incomplete filling during the preparation process.

[0010] The method of the present invention is particularly suitable for processing amorphous hollow tubes or amorphous hollow shafts. The hollow tubes have a uniform and simple structure and are easy to form. Hollow shafts are slightly more complex than hollow tubes, but as long as the structure is within the applicable scope of the present invention, a hollow structure can be prepared according to the design during the shaft forming process, which makes the application scope of the present invention wider.

[0011] The present invention also provides a hollow casting preparation device, comprising a smelting component, a forming mold and a blow casting component arranged in a vacuum chamber; The smelting assembly includes a smelting crucible, a crucible heating mechanism and a feeding mechanism; The molding mold is a two-half copper mold with a left-right opening and closing structure, including a first mold half and a second mold half. The first mold half and the second mold half are molded together to form a casting cavity. The top of the casting cavity is a raw material molten liquid feeding end, and the tail is a blow casting air inlet end. The blow-casting assembly includes a connecting piece and an air nozzle, the connecting piece is connected to the air inlet end of the casting cavity, an air nozzle mounting hole and a main air inlet channel are provided in the connecting piece, the shape structure of the air nozzle mounting hole is adapted to the outer shape of the air nozzle, and the main air inlet channel is connected to an inert gas source; the air nozzle is installed in the air nozzle mounting hole, the air nozzle includes a blowing end and a mounting end, the blowing end of the air nozzle extends into the casting cavity, and the airflow introduced therein moves from the air inlet end of the casting cavity to the feeding end of the raw material melt.

[0012] The preparation device of the present invention has a simple structure and is easy to operate. The smelting component can use a crucible, a corresponding crucible heating mechanism and a feeding mechanism in the prior art. For example, the smelting crucible uses an oxide ceramic crucible, a graphite crucible, etc., the crucible heating mechanism can be selected by induction coil heating, non-consumable arc heating, etc., and the feeding mechanism can be a mechanical device that can be tilted, or a bottom-dropping crucible can be used.

[0013] The forming mold adopts a two-half copper mold with a left and right opening structure. The copper mold has fast heat dissipation, is easy to process and has high precision. The top is set as the feeding end, and the tail connected to the blow casting component is set as the blow casting air inlet end.

[0014] The blow casting component uses the structure of the connecting parts and the air nozzle to introduce inert gas into the copper mold from bottom to top. The direction of the inert gas flow is opposite to the direction of the molten metal feeding. The pressure of the inert gas flow is used to make the molten metal flow around the mold without affecting the cooling rate. The middle is hollow, and the metal fluid near the molding cavity is quickly cooled, thereby preparing an amorphous sample with a through-hole structure.

[0015] Preferably, a circulating cooling device is provided in the molding die. A circulating cooling device, such as a water-cooling circulating device, is provided in the copper mold to better control the cooling rate.

[0016] Preferably, a connection structure is provided on the outside of the gas nozzle mounting end, and a mounting structure matching the connection structure is provided on the gas nozzle mounting hole inside the connecting piece, so that the gas nozzle is fixedly mounted in the gas nozzle mounting hole of the connecting piece. The connection structure of the gas nozzle mounting end is preferably a structure that is easy to disassemble, such as a screw structure.

[0017] Preferably, a blow casting airflow channel is provided inside the air nozzle, and the blow casting airflow channel includes a main airway connected to the main air inlet channel and a branch airway leading to the air blowing end of the air nozzle. The gas inside the air nozzle diffuses from the main airway to the branch airway. The air intake rate and gas volume in the main airway are high, and the control is relatively stable. After entering the branch airway from the main airway, it is not only easier to control the airflow rate and rate, but also conducive to separate design of the main airway and the branch airway, so that the overall design of the air nozzle is more in line with specific products.

[0018] Preferably, the inlets of the main airway are evenly distributed along the side of the installation end, and the number thereof is 2 to 4. The arrangement of multiple main airway inlets can avoid the formation of cyclones in the airway, making the airflow in the branch airway more stable, and multiple main airway inlets can also fill the outside of the gas nozzle with inert gas after installation to prevent external gas from entering.

[0019] Preferably, the blowing end of the air nozzle is a truncated cone structure, and the cross-sectional area of ​​the truncated cone structure increases from the blowing end of the air nozzle to the mounting end; the blowing end of the air nozzle is provided with a first air outlet hole opposite to the melt feeding direction, and is also provided with an oblique air outlet hole group at an angle of 45° to 70° to the first air outlet hole, and the oblique air outlet hole group is evenly distributed along the side of the truncated cone structure, and the number thereof is 2 to 4. The design of the blowing end structure of the air nozzle meets the requirements of uniform distribution of airflow in all directions, so that the formed hole structure is uniform and controllable.

[0020] The present invention also provides a method for preparing a hollow casting body, which is prepared using the preparation device provided in the present invention, and the steps are as follows: S1, in a vacuum environment, taking an amorphous alloy raw material and melting it using a melting assembly to obtain a uniform melt; S2, pouring the molten metal into the molding mold, and simultaneously starting the blow casting assembly to blow an inert gas flow into the casting cavity, adjusting the blow casting parameters, and obtaining the desired hollow casting body.

[0021] Preferably, the blow casting parameters include the degree of environmental vacuum, the air flow rate of the main air inlet channel, and the cooling rate of the casting; the degree of environmental vacuum is 10 -2 ~10 -5 Pa, the air flow rate of the main air inlet channel is 0.08~0.56L / s, and the cooling rate of the casting is 10 2 ~10 3 K / s.

[0022] The preparation method of the hollow casting body provided in the present invention has a simple process and is suitable for industrial mass production. It can prepare a completely amorphous amorphous tubular member with a wall thickness of 1.2~4.0mm and a length of 10~150mm in the main structure of the casting body, thereby solving the technical problem that there is no suitable processing technology in the prior art to manufacture amorphous alloy tubular members. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a simplified schematic diagram of the hollow casting body preparation device of the present invention; Figure 2 The overall structure diagram of the copper mold in the present invention (including connecting parts); Figure 3 for Figure 2 Schematic diagram of the II cross-section structure after the middle mold is divided into half; Figure 4 for Figure 2 Schematic diagram of the II cross-section structure after the middle mold is connected to the air nozzle and split into two halves; Figure 5 It is a schematic diagram of the structure of an independent copper mold in the present invention; Figure 6 for Figure 5 Schematic diagram of the FF cross-section structure after the middle mold is divided into half; Figure 7 is a cross-sectional schematic diagram of a connecting member in the present invention; Figure 8 This is a schematic diagram of the structure of the first locking ring in an embodiment of the present invention; Fig. 9 It is a schematic diagram of the structure of the second locking ring in an embodiment of the present invention; Fig.10 This is a schematic diagram of the appearance structure of the gas nozzle in the present invention; Fig.11 for Fig.10 A schematic cross-sectional view of the middle air nozzle; Fig.12 This is a photo of an amorphous tubular member prepared in an embodiment of the present invention; Fig.13 This is an XRD test diagram of the amorphous tubular member prepared in an embodiment of the present invention; Description of Figure Numbers: 101, arc melting gun; 102, vacuum melting chamber; 103, melting support; 104, melting crucible; 105, pouring port; 106, copper mold; 107, inert gas switch valve; 108, gas nozzle installation hole; 109, gas nozzle; 110, connecting piece; 1061, first locking ring; 1062, second locking ring; 1063, copper mold body; 1064, first locking thread; 1065, second locking thread; 1071, main air intake passage; 1091. Air nozzle head; 1092. First connecting thread; 1093. Second connecting thread; 1094. First air outlet; 1095. Second air outlet; 1096. Third air outlet; 1097. Main line airway entrance. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and technical effect of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention is clearly and completely described. The embodiments described below are part of the embodiments of the present invention, rather than all of the embodiments. In conjunction with the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or the conditions recommended by the manufacturer; if the manufacturer of the reagents or instruments is not specified, they are all conventional products that can be purchased commercially.

[0025] In the description of the present invention, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can all represent: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.

[0026] It should be understood that the weight of the relevant components mentioned in the embodiments of the present invention can not only refer to the specific content of each component, but also represent the proportional relationship between the weights of the components. Therefore, as long as the content of the relevant components in the embodiments of the present invention is proportionally enlarged or reduced, it is within the scope disclosed by the present invention. Specifically, the weight described in the embodiments of the present invention can be a mass unit known in the chemical industry such as μg, mg, g, kg, etc.

[0027] In addition, unless the context clearly uses otherwise, the expression of the singular form of a word should be understood to include the plural form of the word. The term "includes" or "having" is intended to specify the existence of a feature, quantity, step, operation, element, part or combination thereof, but is not used to exclude the existence or possible addition of one or more other features, quantities, steps, operations, elements, parts or combinations thereof.

[0028] An embodiment of the present invention provides a device for preparing a hollow casting body, and the device can be used to prepare an alloy product containing a through-hole structure.

[0029] Specifically, the preparation device of the hollow casting body provided in this embodiment is as shown in the attached drawing of the present invention. Figures 1 to 11 As shown, the preparation device includes three major components: a smelting component, a molding mold, and a blow casting component arranged in a vacuum smelting chamber 102. The smelting component includes a smelting crucible 104, a crucible heating mechanism, and a feeding mechanism. The crucible heating device used in this embodiment is a non-consumable arc smelting furnace 101, and the feeding mechanism uses a crucible support 103. The crucible support 103 can pour the molten liquid in the smelting crucible 104 into the molding mold through a pouring port 105 driven by its mechanical device.

[0030] The molding die 106 used in this embodiment is a two-half copper die with a left-right opening and closing structure, including a first die half and a second die half. The first die half and the second die half are combined to form a casting cavity, and the top of the casting cavity is a raw material molten liquid feeding end ( Figure 2 , 3 , the upper end of the 4 copper molds), the tail is the blow casting air inlet end ( Figure 2 , 3 , 4 the lower end of the copper mold).

[0031] In this embodiment, the amorphous alloy melt is cooled by the heat dissipation performance of the forming copper mold 106. In other embodiments, a circulating cooling device is also provided in the forming mold, especially when preparing large-sized and thick parts, the circulating cooling device can ensure the cooling speed of the amorphous melt during the forming process and ensure the amorphous degree.

[0032] The blow casting assembly in this embodiment includes a connector 110 and a gas nozzle 109. The connector 110 is connected to the gas inlet end of the casting cavity by a threaded structure ( Figure 2 , 3 4), the connecting member 110 is provided with a nozzle mounting hole 108 and a main air inlet channel 1071, the shape and structure of the nozzle mounting hole 108 is adapted to the shape of the nozzle 109, and the main air inlet channel 1071 is connected to an inert gas source (not shown in the figure), as shown in the attached Figure 1 As shown, the inert gas source is connected to the gas switch valve 107, and the opening and closing of the inert gas source and the setting of the pressure and flow rate are controlled by the gas switch valve 107. The inert gas source used in this embodiment is argon, and nitrogen and helium can also be used in other embodiments.

[0033] As attached Figure 3 , 4 In the mold half structure shown, the air nozzle 109 is installed in the air nozzle mounting hole 108, and the air nozzle includes a blowing end and a mounting end. The blowing end of the air nozzle extends into the casting cavity, and the introduced air flow moves from the air inlet end of the casting cavity to the raw material molten liquid feeding end.

[0034] As attached Figure 5 ,6 The copper mold structure shown in the figure, the copper mold body 1063 is composed of a first mold half and a second mold half, and the two mold halves are molded together to form a complete mold cavity. The copper mold body 1063 is provided with a first locking thread 1064 and a second locking thread 1065 at both ends, and the two mold halves are screwed together by using a first locking ring 1061 and a second locking ring 1062.

[0035] The outside of the gas nozzle mounting end is provided with a first connecting thread 1092 and a second connecting thread 1093, and the gas nozzle mounting hole 108 inside the connecting member 110 is provided with a mounting structure that is compatible with the first connecting thread 1092 and the second connecting thread 1093 ( Figure 3 , 4 As shown), the air nozzle 109 is fixedly installed in the air nozzle mounting hole 108 of the connecting member 110.

[0036] The air nozzle 109 is provided with a blow casting air flow channel, which includes a main line air channel connected to the main air inlet channel 1071 and a branch air channel leading to the air blowing end of the air nozzle. In this embodiment, the inlets 1097 of the main line air channel are evenly distributed along the side of the mounting end, and there are three of them.

[0037] In some other embodiments, the number of inlets of the main line airway is 2 or 4.

[0038] In this embodiment, the nozzle head 1091, i.e., the nozzle blowing end, is a truncated cone structure, and the cross-sectional area of ​​the truncated cone structure increases from the nozzle blowing end to the mounting end. The nozzle blowing end is provided with a first air outlet 1094 opposite to the melt feeding direction, and also provided with oblique air outlets at 60° to the first air outlet 1094, namely, a second air outlet 1095 and a third air outlet 1096. The second air outlet 1095 and the third air outlet 1096 are arranged opposite to each other along the side of the nozzle head 1091.

[0039] In some other embodiments, the oblique air outlet group and the first air outlet may be at one of the angles of 45°, 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59°, 61°, 62°, 63°, 64°, 65°, 66°, 67°, 68°, 69°, and 70°.

[0040] In some other embodiments, the number of the oblique air hole groups may be 3 or 4.

[0041] The amorphous tube is prepared using the preparation device provided in this embodiment, and the preparation process is as follows: S1, evacuate the vacuum chamber to below 10 -3 Pa, in a vacuum environment, take the amorphous alloy raw material (Zr 55 Cu15 Al 10 Ni 10 Ti 10 The amorphous composition is smelted by a smelting assembly at a smelting temperature of 1050-1200°C for 3 times to obtain a uniform melt; S2, pour the melted molten metal into the forming mold, and start the blow casting assembly to blow an inert gas flow into the casting cavity, adjust the blow casting parameters, and obtain the desired hollow casting body. The blow casting parameters include the air flow rate of the main air inlet channel and the casting cooling rate. In this embodiment, the air flow rate of the main air inlet channel is adjusted within the range of 0.08-0.56 L / s, and the casting cooling rate is set to 3×10 2 K / s.

[0042] By adjusting the air flow rate of the main air inlet channel, the following Fig.12 As shown, from left to right are 3.2mm thick amorphous tube (outer diameter 14mm, length 70mm), 2.6mm thick amorphous tube (outer diameter 16mm, length 60mm), and 2.8mm thick amorphous tube (outer diameter 20mm, length 64mm).

[0043] The three amorphous tubes were subjected to XRD test and the test results are shown in the attached figure. Fig.13 As shown, from left to right are the test results of the above three amorphous tubes. It can be seen from the diffraction pattern that the above three amorphous tubes are all completely amorphous.

[0044] It can be seen from the above embodiments that the hollow casting body provided in the present invention can prepare a through-hole structure while forming an amorphous main structure, and is particularly suitable for preparing amorphous parts with a main structure wall thickness of 1.2~4.0mm and a length of 10~150mm. The method in the present invention is particularly suitable for processing amorphous hollow tubes or amorphous hollow shafts, and the hollow tube parts have a uniform and simple structure and are easy to form. Hollow shaft parts are slightly more complicated than hollow tube parts, but as long as the structure is within the applicable scope of the present invention, a hollow structure can be prepared according to the design during the shaft forming process, which makes the scope of use of the present invention wider.

[0045] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A hollow casting body, characterized in that: The casting body is an amorphous alloy casting body, and the casting body comprises a main structure and a through-hole structure contained in the main structure; the wall thickness of the main structure of the casting body is 1.2-4.0 mm, and the length is 10-150 mm.

2. The hollow casting body according to claim 1, characterized in that The casting body is an amorphous hollow pipe or an amorphous hollow shaft; the outer diameter of the casting body is 5-20 mm.

3. A device for preparing a hollow casting body, characterized in that: It includes a melting component, a forming mold and a blow casting component arranged in a vacuum chamber; The smelting assembly includes a smelting crucible, a crucible heating mechanism and a feeding mechanism; The molding mold is a two-half copper mold with a left-right opening and closing structure, including a first mold half and a second mold half. The first mold half and the second mold half are molded together to form a casting cavity. The top of the casting cavity is a raw material molten liquid feeding end, and the tail is a blow casting air inlet end. The blow-casting assembly includes a connecting piece and an air nozzle, the connecting piece is connected to the air inlet end of the casting cavity, an air nozzle mounting hole and a main air inlet channel are provided in the connecting piece, the shape structure of the air nozzle mounting hole is adapted to the outer shape of the air nozzle, and the main air inlet channel is connected to an inert gas source; the air nozzle is installed in the air nozzle mounting hole, the air nozzle includes a blowing end and a mounting end, the blowing end of the air nozzle extends into the casting cavity, and the airflow introduced therein moves from the air inlet end of the casting cavity to the feeding end of the raw material melt.

4. The hollow casting preparation device according to claim 3, characterized in that: A circulating cooling device is arranged in the molding die.

5. The hollow casting preparation device according to claim 3, characterized in that: A connecting structure is provided on the outside of the gas nozzle mounting end, and a mounting structure matched with the connecting structure is provided on the gas nozzle mounting hole inside the connecting piece, so that the gas nozzle is fixedly mounted in the gas nozzle mounting hole of the connecting piece.

6. The hollow casting body preparation device according to claim 5, characterized in that: A blow casting air flow channel is arranged inside the air nozzle, and the blow casting air flow channel comprises a main line air channel connected with the main air inlet channel and a branch line air channel leading to the blowing end of the air nozzle.

7. The hollow casting preparation device according to claim 6, characterized in that: The inlets of the main line airway are evenly distributed along the side of the installation end, and the number thereof is 2 to 4.

8. The hollow casting body preparation device according to claim 7, characterized in that: The blowing end of the air nozzle is a truncated cone structure, and the cross-sectional area of ​​the truncated cone structure increases gradually from the blowing end of the air nozzle to the mounting end; the blowing end of the air nozzle is provided with a first air outlet hole opposite to the melt feeding direction, and is also provided with an oblique air outlet hole group which is 45°~70° with the first air outlet hole, and the oblique air outlet hole group is evenly distributed along the side of the truncated cone structure, and the number thereof is 2~4.

9. A method for preparing a hollow casting body, using the preparation device according to any one of claims 3 to 8, characterized in that The following steps are included: S1, in a vacuum environment, taking an amorphous alloy raw material and melting it using a melting assembly to obtain a uniform melt; S2, pouring the molten metal into the molding mold, and simultaneously starting the blow casting assembly to blow an inert gas flow into the casting cavity, adjusting the blow casting parameters, and obtaining the desired hollow casting body.

10. The method for preparing a hollow casting according to claim 9, characterized in that: The blow casting parameters include the degree of environmental vacuum, the air flow rate of the main air inlet channel, and the cooling rate of the casting; The environmental vacuum degree is 10 -2 ~10 -5 Pa, the air flow rate of the main air inlet channel is 0.08~0.56L / s, and the cooling rate of the casting is 10 2 ~10 3 K / s.

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