High-compression-resistance magnesium alloy casting forming system and casting method

Abstract

The invention discloses a high-pressure-resistance magnesium alloy casting forming system and a casting method, and relates to the technical field of magnesium alloy casting forming, the high-pressure-resistance magnesium alloy casting forming system comprises a spraying assembly used for spraying a coolant, and the spraying assembly is arranged below a movable mold base and a fixed mold base; the spraying assembly and the movable mold base are in transmission connection through the linkage assembly, and when the movable mold base is subjected to mold opening, the linkage assembly drives the spraying assembly to turn over by 90 degrees to form a vertical state, so that the spraying assembly is located between the movable mold base and the fixed mold base; and after the spraying assembly is in a vertical state, the swinging assembly receives transmission of the linkage assembly, when the spraying assembly is in a vertical state, the spraying assembly passively rotates by 90 degrees, a spraying head is located between molds, cooling agents are conveniently sprayed, and after the parts are fully cooled, the parts can be conveniently and automatically taken out by a mechanical arm. In the mold opening process, the spraying assembly can rotate in a reciprocating mode, so that the coverage area of the spraying head is increased.

Description

Technical Field

[0001] The invention relates to the technical field of magnesium alloy casting and forming, in particular to a high-pressure magnesium alloy casting and forming system and a casting method. Background Art

[0002] As one of the lightest structural metals, magnesium alloy has the advantages of low density (about 2 / 3 of aluminum and 1 / 4 of steel), high specific strength and specific stiffness, excellent electromagnetic shielding performance, and easy recycling. It has attracted widespread attention in the process of modern industrial lightweighting. The current process steps of magnesium alloy die-casting are as follows: the magnesium alloy raw material is added to the smelting furnace, heated to a certain temperature to melt it, and the refined magnesium alloy liquid is poured into the injection chamber of the die-casting machine. The magnesium alloy liquid is injected into the mold cavity at a high speed through the injection mechanism, and the mold is opened after maintaining the pressure for a period of time. In the above steps, after the mold is opened, a pick-up robot is required to remove the die-cast casting. Then, in order to ensure the rapid separation between the part and the mold, a coolant will be sprayed when the mold is opened, and the separation between the part and the mold will be made easier by rapidly cooling the part. At present, spraying coolants is divided into automatic spraying and manual spraying. Automatic spraying uses a spray robot, which is more difficult to install. Since one side of the equipment is occupied by the pickup robot and the other side needs to have sufficient observation field of view, the pickup spray robot can only be installed on the top of the equipment. During use, coolant, release agent and other substances will vaporize after high temperature. The spray robot at the top has a high failure rate due to long-term and large-scale exposure. Therefore, in order to reduce the downtime rate, companies often perform spraying operations manually. Manual operation is inefficient and poses safety hazards. Summary of the invention

[0003] The object of the present invention is to provide a high-compression magnesium alloy casting molding system and a casting method to solve the deficiencies in the above-mentioned prior art.

[0004] In order to achieve the above object, the present invention provides the following technical solution: A high-pressure magnesium alloy casting molding system, including a die-casting machine, which includes a frame, a movable die seat and a fixed die seat, characterized in that it also includes: A spraying assembly for coolant spraying, which is arranged below the movable die seat and the fixed die seat; The linkage assembly is connected between the spray assembly and the movable mold base through the linkage assembly. When the movable mold base is opening the mold, the linkage assembly drives the spray assembly to flip 90 degrees to form a vertical state, so that the spray assembly is between the movable mold base and the fixed mold base; The swing component receives the transmission of the linkage component after the spray component is in a vertical state, and the swing component passively drives the spray component to reciprocate around itself.

[0005] Preferably, the spraying assembly includes a central tube and a spray head, and the spray head is fixedly mounted on the central tube.

[0006] Preferably, the linkage assembly includes a mounting base, a track frame, a rack, a first elastic member, a pull rod, a connecting seat, a rotating shaft, a base, a gear, and a self-locking portion. The mounting base is fixedly installed on the machine frame. The track frame is installed on the mounting base. One end of the pull rod is slidably connected to the rack. The connecting seat is fixedly installed on the pull rod. The upper part of the connecting seat is fixedly installed on the moving mold base. The first elastic member applies a thrust force to the pull rod away from the moving mold base. The rotating shaft is rotatably connected to the mounting base. The gear is rotatably connected to the rotating shaft. The gear meshes with the rack. The base is fixedly installed at the end of the rotating shaft. The spraying assembly is arranged on the base. The self-locking portion is used to lock the angle between the gear and the rotating shaft.

[0007] Preferably, the self-locking portion includes an insertion block, a socket, a prism, and a second elastic member. The prism is slidably connected to the rotating shaft. The second elastic member applies a thrust force to the prism so that the prism has a tendency to displace towards the center of the rotating shaft. The insertion block is fixedly installed at the lower part of the prism. The socket is opened on the gear.

[0008] Preferably, the insertion block has a first position and a second position. When the spraying assembly is in a horizontal state, the insertion block is inserted into the socket. When the spraying assembly is in a vertical state, the insertion block and the socket are separated.

[0009] Preferably, the swing assembly includes a driving wheel, a driven wheel, and a torsion member. The driving wheel is fixedly connected to the gear. The driven wheel is fixedly sleeved outside the spraying assembly. The spraying assembly is rotatably connected in the base. The upper end of the torsion member is connected to the driven wheel. The lower end of the torsion member is connected to the base.

[0010] Preferably, the driving wheel is provided with a first tooth segment. A plurality of the first tooth segments are evenly distributed on the driving wheel. The driven wheel is provided with a second tooth segment. During the rotation of the driving wheel, the plurality of first tooth segments are sequentially engaged with the second tooth segment.

[0011] Preferably, a cavity is formed inside the base. A quick connector is installed on the base. The quick connector is connected to the cavity. The quick connector is connected to an external air source through a hose.

[0012] Preferably, the quick connector is a three-way connector.

[0013] A high-compression magnesium alloy casting method includes the following steps: S1, preparing a gradient functional coating on the surface of the mold cavity. The coating includes a TiAlN transition layer and a WC-Co-MoS 2 nano-composite functional layer; S2, using a nano-SiO-containing2 The composite mold release agent with polytetrafluoroethylene is electrostatically atomized and sprayed after the mold is preheated; S3. The mold ejection mechanism of the mold is used in cooperation with the coolant purge for demolding.

[0014] In the above technical solution, in the high-compressive magnesium alloy casting forming system and casting method provided by the present invention, when the mold is opened, the spraying assembly rotates passively by 90 degrees, so that the nozzle is located between the molds, facilitating the spraying of the coolant. After the part is fully cooled, it is convenient for the manipulator to automatically take out the part. By setting the swinging assembly, during the mold opening process, the spraying assembly can be reciprocally rotated, increasing the coverage area of the nozzle. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0016] Figure 1 Schematic diagram of the die-casting machine structure of a high-compressive magnesium alloy casting forming system and casting method of the present invention; Figure 2 Schematic diagram of the structure in the mold-closing state of a high-compressive magnesium alloy casting forming system and casting method of the present invention; Figure 3 Schematic diagram of the structure during the mold-opening process of a high-compressive magnesium alloy casting forming system and casting method of the present invention; Figure 4 Schematic diagram of the structure after the mold-opening is completed for a high-compressive magnesium alloy casting forming system and casting method of the present invention; Figure 5 Schematic diagram of the structure of the linkage assembly of a high-compressive magnesium alloy casting forming system and casting method of the present invention; Figure 6 Schematic diagram of the structure when the spraying assembly of a high-compressive magnesium alloy casting forming system and casting method of the present invention is flipped to the vertical state; Figure 7 Schematic diagram of the rack position after the self-locking assembly of a high-compressive magnesium alloy casting forming system and casting method of the present invention is unlocked; Figure 8 Cross-sectional view of the flipping assembly of a high-compressive magnesium alloy casting forming system and casting method of the present invention; Figure 9 Schematic diagram of the structure when the self-locking assembly of a high-compressive magnesium alloy casting forming system and casting method of the present invention is in the locked state; Figure 10It is a schematic diagram of the structure after the self-locking component of a high-compression magnesium alloy casting molding system and casting method of the present invention is unlocked; Figure 11 The present invention is a cross-sectional view of a rack of a high-compression magnesium alloy casting molding system and a casting method.

[0017] Explanation of the accompanying drawings: 1. Die-casting machine; 101. Machine frame; 102. Moving die seat; 103. Fixed die seat; 2. Spraying assembly; 21. Center tube; 22. Nozzle; 3. Linkage assembly; 30. Mounting seat; 31. Track frame; 32. Rack; 33. Pull rod; 331. First elastic member; 34. Connecting seat; 35. Rotating shaft; 351. Limit block; 36. Base; 361. Quick connector; 362. Cavity; 37. Gear; 38. Stop plate; 4. Swinging assembly; 41. Driving wheel; 411. First tooth segment; 42. Passive wheel; 421. Second tooth segment; 43. Torque member; 5. Self-locking part; 51. Insert block; 52. Socket; 53. Prism; 54. Second elastic member. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] See also Figures 1-11 The embodiment of the present invention provides a high-pressure magnesium alloy casting system, comprising a die-casting machine 1, which comprises a frame 101, a movable die seat 102 and a fixed die seat 103, and is characterized in that it also includes: A spraying assembly 2 for spraying a coolant, which is arranged below the movable mold base 102 and the fixed mold base 103; The linkage component 3 is connected between the spraying component 2 and the movable mold base 102. When the movable mold base 102 is opened, the linkage component 3 drives the spraying component 2 to flip 90 degrees to form a vertical state, so that the spraying component 2 is between the movable mold base 102 and the fixed mold base 103; The swing component 4 receives the transmission of the linkage component 3 after the spray component 2 is in a vertical state, and the swing component 4 passively drives the spray component 2 to reciprocate around itself.

[0020] In an embodiment of the present invention, during the mold opening stage after die casting, the moving mold base 102 will gradually move away from the fixed mold base 103. During the movement of the moving mold base 102, under the linkage action of the linkage assembly 3, the spraying assembly 2 will be driven to flip 90 degrees, so that the spraying assembly 2 is flipped from a horizontal state to a vertical state. In this way, the spraying assembly 2 will be smoothly flipped between the moving mold base 102 and the fixed mold base 103. At this time, the coolant is sprayed through the spraying assembly 2 to rapidly cool the part. After cooling, the part can be more conveniently detached from the mold. Moreover, a swinging assembly 4 is provided, and its main purpose is to increase the spraying area of the spraying assembly 2. Due to the relatively narrow installation space of the equipment, correspondingly, the area coverage of the spraying assembly 2 is insufficient. By setting the swinging assembly 4, during the mold opening process, the spraying assembly 2 is passively driven to swing reciprocally around itself, and the swinging of the spraying assembly 2 will inevitably increase the spraying area to cover the part over a large area and cool it more thoroughly.

[0021] In an embodiment of the present invention, please refer to Figure 4 , the spraying assembly 2 includes a central pipe 21 and a nozzle 22, and the nozzle 22 is fixedly installed on the central pipe 21. After the coolant is conveyed through the central pipe 21, it is sprayed out from the nozzle 22 to achieve the cooling of the part.

[0022] In an embodiment of the present invention, please refer to Figures 5-8 and Figure 11 , the linkage assembly 3 includes a mounting seat 30, a track frame 31, a rack 32, a first elastic member 331, a pull rod 33, a connecting seat 34, a rotating shaft 35, a base 36, a gear 37 and a self-locking portion 5. The mounting seat 30 is fixedly installed on the frame 101, the track frame 31 is installed on the mounting seat 30, one end of the pull rod 33 is slidably connected in the rack 32, the connecting seat 34 is fixedly installed on the pull rod 33, the upper part of the connecting seat 34 is fixedly installed on the moving mold base 102, the first elastic member 331 exerts a thrust on the pull rod 33 away from the moving mold base 102, the rotating shaft 35 is rotatably connected to the mounting seat 30, the gear 37 is rotatably connected to the rotating shaft 35, the gear 37 meshes with the rack 32, the base 36 is fixedly installed at the end of the rotating shaft 35, the spraying assembly 2 is arranged on the base 36, the self-locking portion 5 is used to lock the angle between the gear 37 and the rotating shaft 35, a limiting block 351 is arranged at the end of the rotating shaft 35, and a stop baffle 38 is arranged on the mounting seat 30.

[0023] When the moving mold base 102 moves during mold opening, it will first drive the connecting seat 34 to displace. The connecting seat 34 is fixedly connected to the pull rod 33, and the pull rod 33 moves synchronously. The pull rod 33 is movably inserted into the rack 32. Under the thrust of the first elastic member 331, when the pull rod 33 moves, the first elastic member 331 is compressed, and the first elastic member 331 exerts a thrust on the rack 32, causing the rack 32 to displace towards the direction where the connecting seat 34 is located. During the displacement, the rack 32 will drive the gear 37 to rotate. The rotating shaft 35 and the gear 37 are fixed through the self-locking portion 5. Therefore, the rotating shaft 35 rotates synchronously. When the rotating shaft 35 rotates, it will drive the base 36 to rotate synchronously. When the base 36 rotates, it will drive the central pipe 21 to flip, so that the spraying assembly 2 flips from a horizontal state to a vertical state. When the spraying assembly 2 flips to the vertical state, refer to the appendix Figure 6 , at this time, the limiting block 351 will abut against the upper part of the stop baffle 38 and cannot continue to flip. Therefore, the rotating shaft 35 cannot continue to rotate. However, the mold opening is still continuing. Therefore, at this position, the self-locking portion 5 automatically unlocks.

[0024] In the embodiments of the present invention, please refer to Figures 8-10 , the self-locking portion 5 includes an insertion block 51, an insertion opening 52, a prism 53, and a second elastic member 54. The prism 53 is slidably connected to the rotating shaft 35. The second elastic member 54 exerts a thrust on the prism 53, so that the prism 53 has a tendency to displace towards the center of the rotating shaft 35. The insertion block 51 is fixedly installed at the lower part of the prism 53. The insertion opening 52 is formed on the gear 37. The insertion block 51 has a first position and a second position. When the spraying assembly 2 is in a horizontal state, the insertion block 51 is inserted into the insertion opening 52. When the spraying assembly 2 is in a vertical state, the insertion block 51 and the insertion opening 52 are separated.

[0025] When the spraying assembly 2 flips to the vertical state, the insertion block 51 also flips to the vertical state. Under the action of gravity, the prism 53 and the insertion block 51 overcome the elastic force of the second elastic member 54 and displace downward, so that the insertion block 51 disengages from the insertion opening 52. In this way, the restriction between the gear 37 and the rotating shaft 35 is lost, and the gear 37 can rotate. Further, due to the friction force, the insertion block 51 may have poor movement. A magnet can be provided at the lower part of the insertion block 51. When it flips to the vertical, the magnet is closer to the rack 32. Relying on the superposition of magnetic force and gravity, the insertion block 51 can move down smoothly.

[0026] One side of the socket 52 is provided with an inclined surface. The inclined surface is provided to avoid the jamming of the rotating shaft 35 and the gear 37 during mold clamping. During mold clamping, the rotating shaft 35 will first drive the spraying assembly 2 to turn into a horizontal state. At this time, the inserting block 51 also remains horizontal. Under the action of the second elastic member 54, the inserting block 51 is inserted into the socket 52. However, the rack 32 still needs to continue to reset. Correspondingly, the gear 37 still needs to continue to rotate in the reverse direction. Therefore, one side of the socket 52 is set as an inclined surface, realizing the single-rotation-direction locking function between the gear 37 and the rotating shaft 35.

[0027] In an embodiment of the present invention, please refer to Figures 5-8 , the swing assembly 4 includes a driving wheel 41, a driven wheel 42, and a torsion member 43. The driving wheel 41 is fixedly connected to the gear 37. The driven wheel 42 is fixedly sleeved outside the spraying assembly 2. The spraying assembly 2 is rotatably connected in the base 36. The upper end of the torsion member 43 is connected to the driven wheel 42, and the lower end of the torsion member 43 is connected to the base 36. The driving wheel 41 is provided with a first tooth segment 411, and a plurality of the first tooth segments 411 are evenly distributed on the driving wheel 41. The driven wheel 42 is provided with a second tooth segment 421. During the rotation of the driving wheel 41, the plurality of first tooth segments 411 are sequentially engaged with the second tooth segment 421.

[0028] When the spraying assembly 2 is turned to the horizontal state, the self-locking portion 5 is unlocked, and the moving mold base 102 continues to open the mold. At this time, the rack 32 continues to move. The movement of the rack 32 can synchronously drive the gear 37 to rotate. When the gear 37 rotates, it can drive the driving wheel 41 to move. During the rotation of the driving wheel 41, a plurality of first tooth segments 411 arranged outside it are sequentially engaged with the second tooth segment 421. When the first tooth segments 411 are sequentially engaged with the second tooth segment 421, it can drive the driven wheel 42 to rotate. And the driven wheel 42 is fixed on the central tube 21. Therefore, the central tube 21 will rotate around itself. There is a blank area between adjacent first tooth segments 411. In this area, the driving wheel 41 and the driven wheel 42 are not in contact, and the torsion member 43 will drive the driven wheel 42 to rotate back to its original position. When the next first tooth segment 411 is re-engaged with the second tooth segment 421, the central tube 21 will rotate again. In this way, the reciprocating swing of the spraying assembly 2 can be realized to increase the coverage area of the spraying assembly 2.

[0029] In summary, during mold closing, the spraying assembly 2 is in a horizontal state and is locked in position by the insertion block 41 and the socket 42, without affecting mold closing; during mold opening, when the rack 32 and the gear 37 rotate, it is automatically unlocked to make the spraying assembly 2 stand up for operation, and it automatically resets and locks after spraying. The whole process does not require manual intervention or an additional motor, saving electricity and having fewer faults; moreover, demolding and cooling cooperate with each other, and the use of the high-efficiency cooling and demolding cooperation process further improves the efficiency.

[0030] In an embodiment of the present invention, please refer to Figure 8 , a cavity 362 is provided inside the base 36, a quick connector 361 is installed on the base 36, the quick connector 361 is connected to the cavity 362, and the quick connector 361 is connected to an external gas source through a hose.

[0031] The quick connector 361 can be connected to an external coolant. The coolant enters the cavity 362, then enters the central tube 21 from the cavity 362, and finally sprays out from the nozzle 22.

[0032] In another embodiment of the present invention, the quick connector 361 is provided as a three-way connector. The present invention can also spray two media in sequence. By selecting a three-way connector, the three-way connector can respectively connect two media for supply, such as a release agent and a coolant; after mold opening, after the coolant spraying is completed, the manipulator takes out the part, and then the release agent is introduced. The release agent can be sprayed on the mold, and the spraying of the release agent and the coolant is completed by using a single device.

[0033] The current casting method lacks the collaborative optimization of the stress and internal defects of the casting during demolding. During demolding, microcracks are easily caused by stress concentration. Therefore, we propose a high-compressive magnesium alloy casting method to solve the above problems.

[0034] A high-compressive magnesium alloy casting method includes the following steps: S1, preparing a gradient functional coating on the surface of the mold cavity, the coating including a TiAlN transition layer and a WC-Co-MoS 2 nano-composite functional layer; S2, using a composite release agent containing nano-SiO 2 and polytetrafluoroethylene, and electrostatically atomizing and spraying after the mold is preheated; S3, using a mold ejection mechanism to cooperate with coolant purging for demolding.

[0035] In still another embodiment of the present invention, the TiAlN transition layer with a thickness of 5-8 μm and a hardness of HV1500-2000 is deposited on the surface of the mold cavity by magnetron sputtering to improve the matrix bonding force, and then through nano-composite coating, the coating composition is 85% WC-10% Co-5% MoS 2, with a thickness of 10 - 15 μm and a surface roughness Ra of the coating ≤ 0.2 μm, so as to form a lubricating coating on the mold surface; When spraying the mold release agent, the mold release agent has the following components: 60% deionized water + 25% nano-SiO 2 dispersion liquid (particle size 50 - 100 nm) + 10% polytetrafluoroethylene emulsion + 5% surfactant (such as sodium dodecylbenzenesulfonate), and it is sprayed when the mold is preheated to 180 - 220 °C, and the spraying amount is 8 - 12 g / m², which can reduce the interfacial tension between the magnesium alloy liquid and the mold; The coolant is nitrogen.

[0036] First, a TiAlN hard shell (for abrasion prevention) is plated on the mold surface, and then a WC-Co-MoS 2 nano-composite layer (for smoothness) is covered. It's like putting two layers of protective coats on the mold, which can withstand high-temperature friction and prevent the casting from sticking to the mold easily. When spraying the mold release agent, a material containing nano-silica and Teflon is used, and the mold is preheated to 180 - 220 °C before spraying to form a thin lubricating film, which can reduce the demolding force by more than 30% and also reduce defects on the surface of the casting.

[0037] Only some exemplary embodiments of the present invention have been described by way of illustration. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A high-pressure magnesium alloy casting system, comprising a die-casting machine (1), which comprises a frame (101), a movable die seat (102) and a fixed die seat (103), characterized in that: Also includes: A spraying assembly (2) for spraying a coolant, which is arranged below the movable mold base (102) and the fixed mold base (103); The linkage component (3) is connected to the spray component (2) and the movable mold base (102) through the linkage component (3). When the movable mold base (102) is opening the mold, the linkage component (3) drives the spray component (2) to flip 90 degrees to form a vertical state, so that the spray component (2) is located between the movable mold base (102) and the fixed mold base (103); The swing component (4) receives the transmission of the linkage component (3) after the spray component (2) is in a vertical state, and the swing component (4) passively drives the spray component (2) to reciprocate around itself.

2. A high pressure resistant magnesium alloy casting system according to claim 1, characterized in that: The spraying assembly (2) comprises a central tube (21) and a spray head (22), wherein the spray head (22) is fixedly mounted on the central tube (21).

3. The high pressure-resistant magnesium alloy casting system according to claim 1, characterized in that: The linkage assembly (3) comprises a mounting seat (30), a track frame (31), a rack (32), a first elastic member (331), a pull rod (33), a connecting seat (34), a rotating shaft (35), a base (36), a gear (37) and a self-locking portion (5), wherein the mounting seat (30) is fixedly mounted on the frame (101), the track frame (31) is mounted on the mounting seat (30), one end of the pull rod (33) is slidably connected to the rack (32), the connecting seat (34) is fixedly mounted on the pull rod (33), the upper part of the connecting seat (34) is fixedly mounted on the movable mold seat (102), and the first elastic member ( 331) applies a thrust to the pull rod (33) away from the movable mold base (102), the rotating shaft (35) is rotatably connected to the mounting base (30), the gear (37) is rotatably connected to the rotating shaft (35), the gear (37) and the rack (32) are meshed, the base (36) is fixedly mounted on the end of the rotating shaft (35), the spray assembly (2) is arranged on the base (36), the self-locking part (5) is used to lock the angle between the gear (37) and the rotating shaft (35), a limit block (351) is arranged at the end of the rotating shaft (35), and a stop plate (38) is arranged on the mounting base (30).

4. A high pressure resistant magnesium alloy casting system according to claim 3, characterized in that: The self-locking portion (5) comprises an insert block (51), a socket (52), a prism (53), and a second elastic member (54); the prism (53) is slidably connected to the rotating shaft (35); the second elastic member (54) applies a thrust to the prism (53) so that the prism (53) has a tendency to move toward the center of the rotating shaft (35); the insert block (51) is fixedly mounted on the lower part of the prism (53); and the socket (52) is provided on the gear (37).

5. A high pressure-resistant magnesium alloy casting system according to claim 4, characterized in that: The insert block (51) has a first position and a second position; when the spray assembly (2) is in a horizontal state, the insert block (51) is inserted into the socket (52); when the spray assembly (2) is in a vertical state, the insert block (51) and the socket (52) are separated.

6. A high pressure resistant magnesium alloy casting system according to claim 3, characterized in that: The swing assembly (4) comprises a driving wheel (41), a driven wheel (42), and a torque member (43); the driving wheel (41) and the gear (37) are fixedly connected; the driven wheel (42) is fixedly sleeved on the outside of the spray assembly (2); the spray assembly (2) is rotatably connected to the base (36); the upper end of the torque member (43) is connected to the driven wheel (42), and the lower end of the torque member (43) is connected to the base (36).

7. A high pressure-resistant magnesium alloy casting system according to claim 6, characterized in that: The driving wheel (41) is provided with a first tooth segment (411), and a plurality of the first tooth segments (411) are evenly distributed on the driving wheel (41). The driven wheel (42) is provided with a second tooth segment (421), and during the rotation of the driving wheel (41), the plurality of the first tooth segments (411) mesh with the second tooth segments (421) in sequence.

8. The high pressure-resistant magnesium alloy casting system according to claim 6, characterized in that: A cavity (362) is provided inside the base (36), a quick connector (361) is installed on the base (36), the quick connector (361) is connected to the cavity (362), and the quick connector (361) is connected to an external gas source via a hose.

9. A high pressure resistant magnesium alloy casting system according to claim 8, characterized in that: The quick connector (361) is configured as a three-way connector.

10. A high-pressure magnesium alloy casting method, which is implemented based on the high-pressure magnesium alloy casting molding system according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, preparing a gradient functional coating on the surface of the mold cavity, wherein the coating includes a TiAlN transition layer and a WC-Co-MoS2 nanocomposite functional layer; S2, using a composite release agent containing nano-SiO2 and polytetrafluoroethylene, which is electrostatically sprayed after the mold is preheated; S3, the mold ejection mechanism is combined with coolant blowing to demould.

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