Aluminum magnesium alloy self-purification investment casting machine

Abstract

The invention relates to an aluminum magnesium alloy self-purification investment casting machine, and relates to the technical field of aluminum magnesium alloy casting equipment. Comprising a melting furnace, a pressing chamber and a pattern mold, the pressing chamber is communicated with the melting furnace, the pattern mold is communicated with the pressing chamber through an injection channel, a discharging pipe is arranged on the melting furnace and used for adding reducing materials into the melting furnace, the reducing materials are used for reducing magnesium oxide in molten alloy, a first filtering plate is arranged in the melting furnace, and a second filtering plate is arranged in the first filtering plate. The impurity separation device is used for separating impurities in the melting furnace, and a slag storage chamber used for collecting the impurities is arranged in the melting furnace. The method has the effects of improving the purity of the aluminum-magnesium alloy melt and improving the quality of a finished product of a die-cast metal component.

Description

Technical Field

[0001] The present application relates to the technical field of aluminum-magnesium alloy casting equipment, and in particular to an aluminum-magnesium alloy self-purifying investment casting machine. Background Art

[0002] Aluminum-magnesium alloy generally refers to aluminum alloy with magnesium as the main additive element, which has the advantages of high strength, low density, good heat dissipation, etc. It is widely used in electronics, automobiles, aerospace and other fields. Squeeze casting is a metal forming technology between casting and die forging. It is to pour a certain amount of liquid or semi-solid metal directly into the die, and then close the cavity with the punch and apply mechanical static pressure, using the fluidity of the liquid metal to fill the entire cavity, so that the liquid metal crystallizes, solidifies and a small amount of plastic deformation under pressure.

[0003] A related art aluminum-magnesium alloy melting and casting forming device comprises a melting furnace, a punch, a die and an injection device, wherein a feed port is provided on the die, a cavity is formed between the punch and the die, a discharge port is provided on the bottom plate of the melting furnace, the injection device comprises a push barrel, a first push rod, a second push rod and a double-piston rod hydraulic cylinder, and the discharge port of the melting furnace and the feed port of the die are both connected to the push barrel, the molten metal is injected into the push barrel through the discharge port, and is injected into the cavity under the action of the push rod on the push barrel to solidify and fix the shape.

[0004] With respect to the above-mentioned related technologies, the inventors believe that due to the active chemical properties of metallic magnesium, when smelting aluminum-magnesium alloy in a melting furnace, oxidation combustion will occur, and the metallic magnesium in the aluminum-magnesium alloy will generate magnesium oxide, resulting in a loss of the content of metallic magnesium. Magnesium oxide will also form solid inclusions in the aluminum-magnesium alloy melt, so that during the die-casting process, magnesium oxide impurities enter the mold cavity with the alloy melt to cool and shape, thereby affecting the quality of the formed metal components. Summary of the invention

[0005] In order to improve the appearance of impurities in the process of smelting aluminum-magnesium alloy and affect the quality of metal components after forming, the present application provides an aluminum-magnesium alloy self-purification investment casting machine.

[0006] The present application provides an aluminum-magnesium alloy self-purification investment casting machine that adopts the following technical solution: A self-purifying investment casting machine for aluminum-magnesium alloy comprises a melting furnace, a pressure chamber and a mold, wherein the pressure chamber is connected to the melting furnace, and the mold is connected to the pressure chamber through a pressure injection channel. The melting furnace is provided with a discharge pipe for adding reducing materials into the melting furnace, and the reducing materials are used to reduce magnesium oxide in the alloy melt. The melting furnace is provided with a first filter plate for separating impurities generated in the melting furnace, and the melting furnace is provided with a slag storage chamber for collecting impurities.

[0007] By adopting the above technical solution, reducing materials are added to the melting furnace, so that the magnesium oxide in the alloy melt reacts with the reducing materials to generate metal magnesium and metal oxides, so that the content of metal magnesium in the alloy melt is not easy to decrease. The density of the metal oxide is greater than that of the alloy, so it settles on the first filter plate, and the first filter plate separates the metal oxide from the alloy melt and collects it in the slag storage chamber, thereby improving the purity of the alloy melt, and further improving the quality of the finished metal component after die casting.

[0008] Optionally, a hollow shaft is provided on the melting furnace, and a stirring rod is provided at one end of the hollow shaft extending into the melting furnace. The stirring rod is connected to the hollow shaft, and a plurality of air outlet holes are provided on the stirring rod. The hollow shaft is connected to an air inlet pipe via a rotating joint, and the air inlet pipe is used to input protective gas into the hollow shaft.

[0009] By adopting the above technical solution, the protective gas is introduced into the alloy melt through the stirring rod. During the rising process of the protective gas in the alloy melt, the turbulence of the alloy melt can be increased, thereby increasing the rate at which the reducing material can fully react with magnesium oxide. The introduction of the protective gas into the melting furnace can reduce the oxygen content in the melting furnace, thereby reducing the oxidation and combustion of metal magnesium when the alloy is smelted in the melting furnace.

[0010] Optionally, the melting furnace is provided with a moving component for driving the hollow shaft to move, the moving component includes a first driving member, a driving box and a gear, the first driving member is arranged on the melting furnace, the output shaft of the first driving member is coaxially fixed with the gear, the driving box is arranged on the melting furnace, a rack is slidably arranged in the driving box, the gear is meshed with the rack, and the hollow shaft is connected to the rack.

[0011] By adopting the above technical solution, the first driving member is started, the first driving member drives the gear to rotate, and the rack slides along the height direction of the driving box driven by the gear, so that the hollow shaft moves with the rack, and the stirring rod moves up and down in the melting furnace, thereby increasing the degree of disorder of the alloy melt in the melting furnace and accelerating the reaction rate of the reducing material and magnesium oxide.

[0012] Optionally, a connecting block is provided on the rack, a connecting rod is rotatably connected to the connecting block, the connecting rod is connected to the hollow shaft, and a driving block is provided on the melting furnace, the driving block is threadedly connected to the connecting rod.

[0013] By adopting the above technical solution, the connecting block is connected to the rack, so that the hollow shaft moves with the rack. The connecting rod is threadedly connected to the driving block. When the rack drives the connecting rod to move, the connecting rod rotates itself under the action of the driving block, thereby driving the hollow shaft to rotate, so that the stirring rod on the hollow shaft stirs the molten metal in the melting furnace, greatly improving the disorder of the alloy melt and further improving the reaction rate of the reducing material and magnesium oxide.

[0014] Optionally, one end of the first filter plate is connected to a rotating shaft, a sliding groove for sliding the rotating shaft is provided on the side wall of the slag storage chamber, and the hollow shaft is connected to the first filter plate via a connecting assembly.

[0015] By adopting the above technical solution, the hollow shaft is connected to the first filter plate, so that the first filter plate follows the hollow shaft to slide along the height direction of the furnace, driving the rotating shaft on the first filter plate to slide in the sliding groove on the side wall of the slag storage chamber, so that the first filter plate collects impurities in the alloy melt.

[0016] Optionally, the connecting assembly includes a fixed block and a rotating block, one end of the fixed block is rotatably disposed on the hollow shaft, one end of the rotating block is connected to an end of the fixed block away from the hollow shaft, and the other end of the rotating block is connected to the first filter plate.

[0017] By adopting the above technical solution, the hollow shaft drives the fixed block to move, and the fixed block drives the rotating block to rotate, so that the first filter plate rotates around the rotating shaft, so that the first filter plate tilts toward the slag storage chamber, and after the rotating shaft slides to abut against the sliding groove, the impurities collected on the first filter plate slide into the slag storage chamber.

[0018] Optionally, a second filter plate is provided at one end of the first filter plate away from the rotating shaft, and one end of the second filter plate away from the first filter plate abuts against an inner wall of the melting furnace.

[0019] By adopting the above technical solution, during the rotation of the first filter plate, a gap will appear between the first filter plate and the inner wall of the melting furnace, and the second filter plate will always be in contact with the furnace wall of the melting furnace, making it difficult for impurities on the first filter plate to slip out of the gap, thereby improving the collection efficiency of the first filter plate for impurities in the alloy melt.

[0020] Optionally, the melting furnace is provided with an exhaust pipe, the exhaust pipe is provided with a heat exchanger, the air inlet pipe is connected to the heat exchanger, and the heat exchanger is used to increase the temperature of the protective gas in the air inlet pipe.

[0021] By adopting the above technical solution, since the melting furnace is a high-temperature environment, the high-temperature exhaust gas discharged from the melting furnace is used to heat the air inlet pipe through a heat exchanger, thereby reducing the temperature difference between the protective gas entering the melting furnace and the molten alloy, improving the stability of the molten alloy, and reducing the splashing and explosion of the molten alloy due to excessive temperature difference.

[0022] Optionally, a first heat exchange tube and a second heat exchange tube are provided in the heat exchanger, the first heat exchange tube is connected to the intake pipe, the second heat exchange tube is connected to the exhaust pipe, and the second heat exchange tube is spirally wound on the outer circumferential surface of the first heat exchange tube.

[0023] By adopting the above technical solution, the second heat exchange tube is spirally wound on the outer circumferential surface of the first heat exchange tube, so that the second heat exchange tube can fully heat the first heat exchange tube, thereby improving the heat exchange efficiency and allowing the protective gas in the gas supply pipe to heat up quickly.

[0024] Optionally, a punching block is slidably connected to the pressure chamber, a side wall of the punching block abuts against an inner wall of the pressure chamber, and a second driving member for driving the punching block to move is provided on the melting furnace.

[0025] By adopting the above technical solution, the filtered alloy melt flows into the pressure chamber, and is pressed into the mold under the action of the punching block, and the alloy melt is solidified and formed under the pressure of the punching block.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. By setting the first filter plate and the slag storage chamber in the melting furnace, adding reducing materials into the melting furnace, the magnesium oxide in the alloy melt reacts with the reducing materials to generate metallic magnesium and metal oxides, so that the content of metallic magnesium in the alloy melt is not easy to decrease. The first filter plate separates the metal oxides from the alloy melt and collects them into the slag storage chamber, thereby improving the purity of the alloy melt, and further improving the quality of the finished metal component after die casting; 2. By arranging a hollow shaft and a stirring rod on the melting furnace, the hollow shaft rotates to stir the alloy melt, which can increase the degree of turbulence of the alloy melt, thereby increasing the rate at which the reducing materials can fully react with magnesium oxide. The protective gas is introduced into the alloy melt through the stirring rod, which can reduce the oxygen content in the melting furnace, thereby reducing the oxidation and combustion of metal magnesium when the alloy is smelted in the melting furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of an aluminum-magnesium alloy self-purification investment casting machine according to an embodiment of the present application.

[0028] Figure 2 It is a schematic diagram of the structure of the pressure chamber in the embodiment of the present application.

[0029] Figure 3 It is a structural schematic diagram of the connection component in an embodiment of the present application.

[0030] Figure 4 It is a structural schematic diagram of the mobile component in the embodiment of the present application.

[0031] Figure 5 It is a schematic diagram of the structure of the heat exchanger in the embodiment of the present application.

[0032] Explanation of the reference numerals: 1. melting furnace; 11. discharge pipe; 12. first filter plate; 13. slag storage chamber; 14. rotating shaft; 15. sliding groove; 16. second filter plate; 17. exhaust pipe; 2. pressure chamber; 21. mold; 22. injection channel; 23. punching block; 24. second driving member; 3. hollow shaft; 31. stirring rod; 32. air outlet; 33. rotary joint; 34. air inlet pipe; 4. moving assembly; 41. first driving member; 42. driving box; 43. gear; 44. rack; 45. connecting block; 46. connecting rod; 47. driving block; 5. connecting assembly; 51. fixed block; 52. rotating block; 6. heat exchanger; 61. first heat exchange tube; 62. second heat exchange tube. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-5 This application is described in further detail.

[0034] The present application embodiment discloses an aluminum-magnesium alloy self-cleaning investment casting machine. Figure 1 A self-cleaning aluminum-magnesium alloy investment casting machine includes a melting furnace 1, a pressure chamber 2 and a mold 21. The melting furnace 1 is used to melt the aluminum-magnesium alloy into a liquid state. The pressure chamber 2 is fixedly connected to the melting furnace 1 and communicated with each other. The mold 21 is connected to the pressure chamber 2 through a pressure injection channel 22. The molten alloy melt flows into the pressure chamber 2 and is then punched into the mold 21 for solidification.

[0035] Reference Figure 1 and Figure 2 A punch block 23 is slidably connected to the pressure chamber 2, and the side wall of the punch block 23 abuts against the inner wall of the pressure chamber 2. A second driving member 24 for driving the punch block 23 to move is fixedly connected to the melting furnace 1. In this embodiment, the second driving member 24 is a cylinder. The alloy melt flows into the pressure chamber 2, and the second driving member 24 drives the punch block 23 to move in the pressure chamber 2. The alloy melt is filled into the mold 21 under the pressure of the punch block 23 and solidified.

[0036] Reference Figure 3During the smelting process of aluminum-magnesium alloy, the metal magnesium in the alloy will be oxidized and burned, thereby generating magnesium oxide that dissolves in the alloy melt. A discharge pipe 11 for adding reducing materials to the alloy melt in the melting furnace 1 is fixedly connected to the melting furnace 1. The reducing materials are used to react with magnesium oxide. In this embodiment, the reducing materials can be selected from metal compounds containing tin or cadmium, which react with magnesium oxide to generate metal magnesium and metal oxides with higher density. This makes it difficult to reduce the content of metal magnesium in the alloy melt, thereby improving the quality of the metal components after the alloy melt is liquid cast. The metal oxides generated by the reaction do not react with the alloy melt and can settle in the alloy melt.

[0037] Reference Figure 3 A slag storage chamber 13 is fixedly arranged in the melting furnace 1, and a first filter plate 12 is slidably arranged in the melting furnace 1. One end of the first filter plate 12 is fixedly connected to a rotating shaft 14. A sliding groove 15 for the rotating shaft 14 to slide is provided on the inner wall of the melting furnace 1. The sliding groove 15 is arranged along the height direction of the melting furnace 1, and the end of the sliding groove 15 close to the top of the melting furnace 1 is not connected to the inner wall of the melting furnace 1 to limit the sliding distance of the rotating shaft 14. The end of the first filter plate 12 away from the rotating shaft 14 is rotatably connected to the second filter plate 16. The second filter plate 16 is arranged obliquely and the end of the second filter plate 16 away from the first filter plate 12 abuts against the inner wall of the melting furnace 1. The first filter plate 12 slides in the melting furnace 1 to filter the metal oxide impurities generated by the reaction of the reducing materials in the alloy melt. The slag storage chamber 13 is used to store the metal oxide impurities collected by the first filter plate 12, thereby improving the purity of the alloy melt, and further improving the quality of the finished metal component after the alloy melt is liquid cast.

[0038] Reference Figure 3 and Figure 4 , a moving assembly 4 for driving the first filter plate 12 to slide is provided on the melting furnace 1. The moving assembly 4 includes a first driving member 41, a driving box 42, a gear 43 and a rack 44. The first driving member 41 and the driving box 42 are fixedly arranged on the melting furnace 1, and the rack 44 is slidably arranged in the driving box 42, and the rack 44 slides along the height direction of the driving box 42. The gear 43 is coaxially fixed with the output shaft of the first driving member 41, and the gear 43 is meshed with the rack 44. In this embodiment, the first driving member 41 is a forward and reverse motor. A hollow shaft 3 is penetrated on the melting furnace 1, and a connecting block 45 is fixedly connected to the rack 44. A connecting rod 46 is rotatably connected to the connecting block 45. The connecting rod 46 is fixedly connected to one end of the hollow shaft 3 extending out of the melting furnace 1. A driving block 47 is fixedly connected to the melting furnace 1, and the connecting rod 46 is threadedly connected to the driving block 47.

[0039] Reference Figure 3The hollow shaft 3 is connected to the first filter plate 12 through a connecting assembly 5, and the connecting assembly 5 includes a fixed block 51 and a rotating block 52. One end of the fixed block 51 is rotatably connected to the hollow shaft 3, and the end of the fixed block 51 away from the hollow shaft 3 is hinged to the rotating block 52, and the end of the rotating block 52 away from the fixed block 51 is hinged to the first filter plate 12.

[0040] Reference Figure 3 , one end of the hollow shaft 3 extending into the melting furnace 1 is fixedly connected with a stirring rod 31, and a plurality of useful air outlet holes 32 are provided on the stirring rod 31, and the plurality of air outlet holes 32 are evenly arranged along the length direction of the stirring rod 31. The hollow shaft 3 is used to pass a protective gas into the melting furnace 1, which is used to reduce the oxygen content in the melting furnace 1, thereby reducing the oxidation and combustion of metallic magnesium when the melting furnace 1 is smelting aluminum-magnesium alloy, and can reduce the loss of metallic magnesium in the alloy melt. In the non-working state, the stirring rod 31 is separated from the alloy melt by the drive of the hollow shaft 3, and the protective gas is blown out from the air outlet hole 32, which can blow away the alloy melt attached to the hole wall of the air outlet hole 32, so that after the alloy melt is cooled, the stirring rod 31 is unlikely to be blocked.

[0041] The staff starts the first driving member 41, which drives the gear 43 to rotate, so that the rack 44 slides along the height direction of the driving box 42. The rack 44 drives the connecting block 45 to move, and the connecting block 45 drives the connecting rod 46 to move, so that the hollow shaft 3 moves under the drive of the connecting block 45. The connecting rod 46 is threadedly connected to the driving block 47, so that the connecting rod 46 rotates itself under the drive of the driving block 47, so that the hollow shaft 3 rotates itself while moving up and down, and the stirring rod 31 on the hollow shaft 3 stirs the molten metal in the melting furnace 1, greatly increasing the degree of disorder of the alloy melt, so that the reducing material and magnesium oxide react fully and the reaction rate is increased.

[0042] When the hollow shaft 3 moves toward the top of the melting furnace 1, the hollow shaft 3 drives the fixed block 51 to move, and the fixed block 51 drives the rotating block 52 to rotate, so that the first filter plate 12 is driven by the rotating block 52 to tilt and rotate toward the slag storage chamber 13 with the rotating shaft 14 as the axis. Driven by the hollow shaft 3, the first filter plate 12 filters and cleans the oxide impurities in the alloy melt, and after the rotating shaft 14 slides to abut against the groove wall of the sliding groove 15, the impurities collected on the first filter plate 12 slide into the slag storage chamber 13.

[0043] Reference Figure 5The melting furnace 1 is connected with an exhaust pipe 17, the hollow shaft 3 is fixedly connected with a rotary joint 33, the rotary joint 33 is fixedly connected with an air inlet pipe 34, the exhaust pipe 17 is fixedly connected with a heat exchanger 6, and the air inlet pipe 34 is fixedly connected with the heat exchanger 6. The heat exchanger 6 is fixedly connected with a first heat exchange pipe 61 and a second heat exchange pipe 62, and the second heat exchange pipe 62 is spirally wound on the outer circumference of the first heat exchange pipe 61, so as to improve the heat exchange efficiency of the first heat exchange pipe 61 and the second heat exchange pipe 62. The first heat exchange pipe 61 is fixedly connected with the air inlet pipe 34, and the second heat exchange pipe 62 is fixedly connected with the exhaust pipe 17. The high-temperature gas in the melting furnace 1 is discharged from the exhaust pipe 17, and the first heat exchange pipe 61 is heat-exchanged through the second heat exchange pipe 62, and the protective gas introduced into the melting furnace 1 is heated, thereby reducing the splashing and bursting of the alloy melt due to the large temperature difference between the protective gas and the alloy melt.

[0044] The implementation principle of the self-purifying investment casting machine of aluminum-magnesium alloy in the embodiment of the present application is as follows: the melting furnace 1 melts the aluminum-magnesium alloy into a molten alloy, and the metal magnesium in the molten alloy is oxidized and burned to generate magnesium oxide during the smelting process. Reducing materials are added to the melting furnace 1, so that the reducing materials react with the magnesium oxide in the molten alloy to generate metal magnesium and metal oxide impurities, and the metal oxide impurities are precipitated in the molten alloy. The first driving member 41 is started, so that the hollow shaft 3 moves up and down in the melting furnace 1 while rotating, thereby increasing the degree of disorder of the molten alloy in the melting furnace 1 and accelerating the reaction rate of the reducing materials and magnesium oxide.

[0045] The first filter plate 12 moves up and down in the melting furnace 1 driven by the hollow shaft 3, filters out the metal oxide impurities generated by the reaction of the reducing materials, and collects them into the slag storage chamber 13, thereby improving the purity of the alloy melt and the quality of the finished metal component after die casting.

[0046] A protective gas is introduced into the melting furnace 1 through the air inlet pipe 34. The protective gas is heated by the high-temperature gas discharged from the melting furnace 1 through the heat exchanger 6, so that the protective gas is not prone to splashing and bursting when it is introduced into the alloy melt. The protective gas can also reduce the oxygen content in the melting furnace 1, thereby reducing the oxidation and combustion of metallic magnesium when smelting the aluminum-magnesium alloy.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A self-purifying aluminum-magnesium alloy investment casting machine, characterized in that: The invention comprises a melting furnace (1), a pressure chamber (2) and a mold (21), wherein the pressure chamber (2) is connected to the melting furnace (1), and the mold (21) is connected to the pressure chamber (2) via a pressure injection channel (22). The melting furnace (1) is provided with a discharge pipe (11) for adding reducing materials into the melting furnace (1), wherein the reducing materials are used to reduce magnesium oxide in the alloy melt. The melting furnace (1) is provided with a first filter plate (12) for separating impurities generated in the melting furnace (1), and the melting furnace (1) is provided with a slag storage chamber (13) for collecting impurities.

2. The aluminum-magnesium alloy self-cleaning investment casting machine according to claim 1, characterized in that: The melting furnace (1) is provided with a hollow shaft (3), and one end of the hollow shaft (3) extending into the melting furnace (1) is provided with a stirring rod (31), the stirring rod (31) is connected to the hollow shaft (3), and the stirring rod (31) is provided with a plurality of air outlet holes (32). The hollow shaft (3) is connected to an air inlet pipe (34) via a rotating joint (33), and the air inlet pipe (34) is used to input protective gas into the hollow shaft (3).

3. The aluminum-magnesium alloy self-cleaning investment casting machine according to claim 2, characterized in that: The melting furnace (1) is provided with a moving assembly (4) for driving the hollow shaft (3) to move. The moving assembly (4) comprises a first driving member (41), a driving box (42) and a gear (43). The first driving member (41) is arranged on the melting furnace (1). The output shaft of the first driving member (41) is coaxially fixed with the gear (43). The driving box (42) is arranged on the melting furnace (1). A rack (44) is slidably arranged in the driving box (42). The gear (43) meshes with the rack (44). The hollow shaft (3) is connected to the rack (44).

4. The aluminum-magnesium alloy self-cleaning investment casting machine according to claim 3, characterized in that: The rack (44) is provided with a connecting block (45), and the connecting block (45) is rotatably connected to a connecting rod (46), and the connecting rod (46) is connected to the hollow shaft (3). The melting furnace (1) is provided with a driving block (47), and the driving block (47) is threadedly connected to the connecting rod (46).

5. The aluminum-magnesium alloy self-cleaning investment casting machine according to claim 2, characterized in that: One end of the first filter plate (12) is connected to a rotating shaft (14); a sliding groove (15) for the rotating shaft (14) to slide is provided on the side wall of the melting furnace (1); and the hollow shaft (3) is connected to the first filter plate (12) via a connecting assembly (5).

6. The aluminum-magnesium alloy self-cleaning investment casting machine according to claim 5, characterized in that: The connecting assembly (5) comprises a fixed block (51) and a rotating block (52); one end of the fixed block (51) is rotatably arranged on the hollow shaft (3); one end of the rotating block (52) is connected to an end of the fixed block (51) away from the hollow shaft (3); and the other end of the rotating block (52) is connected to the first filter plate (12).

7. The aluminum-magnesium alloy self-cleaning investment casting machine according to claim 6, characterized in that: A second filter plate (16) is provided at one end of the first filter plate (12) away from the rotating shaft (14); and one end of the second filter plate (16) away from the first filter plate (12) abuts against the inner wall of the melting furnace (1).

8. The aluminum-magnesium alloy self-cleaning investment casting machine according to claim 2, characterized in that: The melting furnace (1) is provided with an exhaust pipe (17), the exhaust pipe (17) is provided with a heat exchanger (6), the air inlet pipe (34) is connected to the heat exchanger (6), and the heat exchanger (6) is used to increase the temperature of the protective gas in the air inlet pipe (34).

9. The aluminum-magnesium alloy self-cleaning investment casting machine according to claim 8, characterized in that: The heat exchanger (6) is provided with a first heat exchange tube (61) and a second heat exchange tube (62); the first heat exchange tube (61) is connected to the intake tube (34), the second heat exchange tube (62) is connected to the exhaust tube (17), and the second heat exchange tube (62) is spirally wound on the outer peripheral surface of the first heat exchange tube (61).

10. The aluminum-magnesium alloy self-cleaning investment casting machine according to claim 1, characterized in that: A punching block (23) is slidably connected to the pressure chamber (2), and the side wall of the punching block (23) abuts against the inner wall of the pressure chamber (2). The melting furnace (1) is provided with a second driving member (24) for driving the punching block (23) to move.

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