Magnesium-aluminum alloy hub extrusion equipment and process

Abstract

The invention discloses magnesium-aluminum alloy hub extrusion equipment and a magnesium-aluminum alloy hub extrusion process, and relates to the technical field of automobile part machining. Comprising a fixing base and moving wheels installed at the four corners of the bottom end of the fixing base, the jacking structure is arranged at the top end of the fixing base and used for jacking an extruded and formed hub, and a protective cover is arranged at the top end of the jacking structure; the lower die seat is arranged at the top end of the jacking structure, and the lower die seat is used for carrying out extrusion forming on the hub; and the moving structure is arranged on the inner wall of the top end of the protective cover and used for moving the upper mold assembly so as to extrude the hub. Through the arranged jacking structure, the formed hub can be quickly jacked out of the mold, deformation or damage generated in the taking-out process of the hub can be effectively avoided, and therefore the quality and consistency of finished products are improved, meanwhile, the finished products can be stably pushed out through the jacking structure, mechanical impact of the mold is relieved, the service life of the mold is prolonged, and the production efficiency is improved. And the frequency of maintenance and replacement is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts processing, in particular to magnesium-aluminum alloy wheel hub extrusion equipment and process. Background Art

[0002] With the development of science and technology, the use of automobiles has become more common. As one of the important components of the automobile driving system, the wheel hub is also a safety component with high requirements. It not only bears the weight of the automobile, but also reflects the appearance of the automobile. The integrity and stability of the wheel hub structure are very important for the safe use of the wheel. With the increasing demand for lightweight automobiles, magnesium-aluminum alloy wheels are gradually replacing traditional steel wheels in modern automobile manufacturing and are widely promoted and applied, especially magnesium alloy wheels, which are not only light in weight and high in strength, but also have good damping performance.

[0003] Most of the existing magnesium alloy wheel hubs are formed by casting or forging. The mold cannot be replaced well during casting and forging of the magnesium alloy wheel hub, which results in the size of the wheel hub being limited during production. The formed wheel hub is also inconvenient to be removed from the mold, which can easily cause damage to the formed wheel hub. Therefore, the present application proposes a magnesium alloy wheel hub extrusion device and process to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a magnesium-aluminum alloy wheel hub extrusion device and process to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: a magnesium-aluminum alloy wheel hub extrusion device and process, comprising a fixed seat and moving wheels installed at the four corners of the bottom end of the fixed seat,

[0006] A lifting structure is arranged at the top of the fixing seat, the lifting structure is used to lift the extruded wheel hub, and a protective cover is arranged at the top of the lifting structure;

[0007] A lower die seat, arranged at the top of the jacking structure, and used for extruding the wheel hub;

[0008] A moving structure is arranged on the inner wall of the top of the protective cover and is used to move the upper mold assembly so as to extrude the wheel hub;

[0009] The upper mold assembly is arranged at the bottom end of the movable structure, and the upper mold assembly is used for extruding the wheel hub.

[0010] As a specific solution of the technical solution of the present application, the jacking structure includes a fixed frame, which is connected to the top of the fixed seat, and movable grooves are opened on the inner walls on both longitudinal sides of the fixed frame, and sliding blocks are movably arranged in the movable grooves.

[0011] As a specific scheme of the technical solution of the present application, a threaded rod and a support rod are arranged between the inner side of the top of the fixed frame and the top of the fixed seat, the threaded rod is located on the left side of the fixed seat, the outer wall of the threaded rod is threadedly connected with a threaded sleeve, the outer wall of the support rod is movably provided with a moving block, a connecting plate is fixedly connected between the outer side of the threaded sleeve and the outer side of the sliding block, and the outer side of the moving block is fixedly connected to the outer wall of another sliding block by another connecting plate.

[0012] As a specific solution of the technical solution of the present application, a fixing plate is fixedly connected between the connecting plates, and a lifting rod is installed at the center position of the top of the fixing plate, and the top of the lifting rod passes through the top outer wall of the fixing frame and is threadedly connected to a lifting block.

[0013] As a specific solution of the technical solution of the present application, the movable structure includes a support plate, which is connected to the inner sides of both ends of the protective cover, and a screw rod and a guide rod are respectively arranged between the top of the support plate and the inner wall of the top of the protective cover, and a motor is installed at the top of the protective cover.

[0014] As a specific solution of the technical scheme of the present application, the outer wall of the screw is threadedly provided with a screw seat, the outer wall of the guide rod is movably provided with a guide block, the output end of the motor is connected to the top end of the screw, a mounting plate is fixedly connected between the screw seat and the guide block, and a plurality of electric push rods are installed at the bottom end of the mounting plate.

[0015] As a specific solution of the technical solution of the present application, the upper mold assembly includes a mounting block, the top of the mounting block is connected to the telescopic end of the electric push rod, a connecting sleeve is installed at the center position of the bottom end of the mounting block, a mold connecting plate is installed at the other end of the connecting sleeve, and the mold connecting plate and the top of the mounting block are both provided with relative mounting holes, a connecting rod is installed in the mounting hole, and the upper mold is installed at the center position of the bottom end of the mold connecting plate.

[0016] As a specific solution of the technical solution of this application, a movable sleeve is installed at the four corners of the bottom end of the mold connecting plate, a limiting rod is movably arranged on the inner wall of the movable sleeve, a compression spring is arranged between the bottom end of the movable sleeve and the top end of the fixed block, and the compression spring is arranged around the outer wall of the limiting rod.

[0017] As a specific solution of the technical solution of the present application, the lower mold seat includes a lower pressure hole opened at the top, a through hole is opened at the center position of the top of the lower mold seat, a hub mold is arranged in the through hole, a connecting groove is opened on the inner wall of the bottom end of the hub mold, the connecting groove is adapted to the lifting block, and a heating coil is arranged on the outer wall of the hub mold.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The magnesium-aluminum alloy wheel hub extrusion equipment and process can quickly eject the formed wheel hub out of the mold by means of a jacking structure, and can effectively avoid deformation or damage of the wheel hub during the removal process, thereby improving the quality and consistency of the finished product. At the same time, the jacking structure can smoothly push the finished product out, reducing the mechanical impact of the mold, extending the service life of the mold, and reducing the frequency of maintenance and replacement.

[0020] At the same time, the mobile structure can quickly separate the upper mold and the lower mold, shortening the time of each mold opening and closing, and reducing the direct contact between the molds during the separation process, reducing the risk of wear and damage, thereby extending the service life of the mold. The automated lifting structure simplifies the mold operation process, reduces manual intervention, improves safety, and reduces the workload of operators.

[0021] Secondly, adding a heating coil in the lower mold can effectively heat the mold and maintain a stable temperature, which helps to improve the fluidity of the magnesium-aluminum alloy and improve the molding quality. Through heating, the adhesion and wear of the material in the mold are reduced, the risk of damage to the mold is reduced, and the service life is extended. The setting of the heating coil enables the mold to adapt to different types of alloy materials and molding processes, thereby improving production flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an overall axial side schematic diagram of the present invention;

[0023] Figure 2 It is a front view structural schematic diagram of the present invention;

[0024] Figure 3 It is a schematic diagram of the jacking structure of the present invention;

[0025] Figure 4 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0026] Figure 5 For the present invention Figure 4 A is an enlarged schematic diagram;

[0027] Figure 6 It is a cross-sectional schematic diagram of the lower mold of the present invention;

[0028] Figure 7 It is a schematic structural diagram of the upper mold assembly of the present invention.

[0029] In the figure: 1, fixed seat; 101, moving wheel; 2, lifting structure; 201, fixed frame; 202, moving groove; 203, sliding block; 204, threaded rod; 205, support rod; 206, threaded sleeve; 207, moving block; 208, connecting plate; 209, fixed plate; 210, lifting rod; 211, lifting block; 3, protective cover; 4, moving structure; 401, support plate; 402, screw rod; 403, guide rod; 404, guide block; 405, screw seat; 406, motor; 407, mounting plate; 408, electric push rod; 5, upper mold assembly; 501, mounting block; 502, mold connecting plate; 503, upper mold; 504, connecting rod; 505, movable sleeve; 506, compression spring; 507, fixed block; 6, lower mold seat; 601, lower pressure hole; 602, hub mold; 603, connecting groove; 604, heating coil. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on 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.

[0031] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0032] Furthermore, it should be understood that for the sake of ease of description, the sizes of the various components shown in the drawings are not drawn according to actual proportions. For example, the thickness or width of certain layers may be exaggerated relative to other layers.

[0033] It should be noted that like reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined or described in one drawing, it will not require further detailed discussion and description in the description of the subsequent drawings.

[0034] like Figure 1-Figure 7As shown, the present invention provides a technical solution: a magnesium-aluminum alloy wheel hub extrusion equipment and process, including a fixed seat 1 and a moving wheel 101 installed at the four corners of the bottom end of the fixed seat 1, a lifting structure 2, arranged at the top of the fixed seat 1, the lifting structure 2 is used to lift the extruded wheel hub, and a protective cover 3 is arranged at the top of the lifting structure 2; a lower mold seat 6 is arranged at the top of the lifting structure 2, and the lower mold seat 6 is used to extrude the wheel hub; a moving structure 4 is arranged on the inner wall of the top of the protective cover 3, and is used to move the upper mold assembly 5, so as to extrude the wheel hub. In the embodiment of the present application, it should be clear that the lower mold seat 6 is connected to the fixed frame 201 by bolts, so that the lower mold seat 6 can be replaced.

[0035] like Figures 1 to 3 As shown, in order to eject the formed wheel hub in the wheel hub mold 602 in the lower mold seat 6 out of the wheel hub mold 602, a lifting structure 2 is arranged on the inner wall of the lower mold seat 6. Specifically, the lifting structure 2 includes a fixed frame 201, which is connected to the top of the fixed seat 1, and the inner walls on both sides of the longitudinal direction of the fixed frame 201 are provided with moving grooves 202, and sliding blocks 203 are arranged in the moving grooves 202 for movement. It should be clear that the moving grooves 202 are arranged on the inner walls on both sides of the longitudinal direction of the fixed frame 201, and the moving grooves 202 are symmetrically arranged. The sliding blocks 203 are arranged in the moving grooves 202, and the sliding blocks 203 can assist in driving the lifting rods 210 and the lifting blocks 211 to rise, so as to lift the formed wheel hub in the wheel hub mold 602.

[0036] A threaded rod 204 and a support rod 205 are arranged between the inner side of the top of the fixed frame 201 and the top of the fixed seat 1, the threaded rod 204 is located on the left side of the fixed seat 1, the outer wall of the threaded rod 204 is threadedly connected with a threaded sleeve 206, and the outer wall of the support rod 205 is movably provided with a moving block 207, a connecting plate 208 is fixedly connected between the outer side of the threaded sleeve 206 and the outer side of the sliding block 203, and another connecting plate 208 is fixedly connected between the outer side of the moving block 207 and the outer wall of another sliding block 203. It should be clear that the top of the threaded rod 204 is connected to the top of the fixed seat 1 through a plane bearing, and a through hole is opened on the bottom end of the fixed frame 201, and the threaded rod 204 can rotate in the through hole. At the same time, it should also be clear that a motor 406 is arranged outside the bottom end of the fixed frame 201. Since the motor 406 is a prior art (not shown in this application), the output end of the motor 406 is connected to the bottom end of the threaded rod 204. A fixed plate 209 is fixedly connected between the connecting plates 208, and a lifting rod 210 is installed at the center of the top of the fixing plate 209, and the top of the lifting rod 210 penetrates the top outer wall of the fixing frame 201 and is threadedly connected to a lifting block 211. As can be seen from the foregoing, a support rod 205 is also provided on the top inner wall of the fixing frame 201 and the top of the fixing seat 1, and a moving block 207 is movably provided on the outer wall of the support rod 205, and a threaded sleeve 206 is threadedly connected to the outer wall of the threaded rod 204, and a connecting plate 208 is installed between the threaded sleeve 206, the moving block 207 and the sliding block 203, and a fixed plate 209 is installed between the connecting plates 208. Figure 3 It can be seen that the lifting rod 210 is connected to the fixed plate 209. When the threaded rod 204 rotates, the threaded sleeve 206 can drive the connecting plate 208 and the fixed plate 209 to rise and fall, forming a linear reciprocating motion mechanism. In this application, the lifting structure 2 is not specifically limited, as long as it can drive the lifting rod 210 and the lifting block 211 to rise, for example, an electric slide rail and an electric slider, an electric push rod, a chain sprocket, etc. Since it is a prior art, it will not be repeated again. In the embodiment of the application, it is also necessary to understand that in order to be able to disassemble the wheel hub mold 602 and the lifting block 211, the lifting block 211 is threadedly connected to the top outer wall of the lifting rod 210, so that the lifting block 211 and the lifting rod 210 are disassembled, thereby disassembling and replacing the wheel hub mold 602.

[0037] like Figure 7As shown, in order to separate the lower mold base 6 from the upper mold assembly 5, the upper mold assembly 5 realizes the separation of the upper mold assembly 5 and the lower mold base 6 by setting a moving structure 4, and the upper mold assembly 5 can also be replaced. Specifically, the moving structure 4 includes a support plate 401, the support plate 401 is connected to the inner sides of both ends of the protective cover 3, and a screw rod 402 and a guide rod 403 are respectively arranged between the top of the support plate 401 and the inner wall of the top of the protective cover 3, and a motor 406 is installed at the top of the protective cover 3. The outer wall of the screw rod 402 is threaded with a screw rod seat 405, and the outer wall of the guide rod 403 is movably provided with a guide block 404. The output end of the motor 406 is connected to the top of the screw rod 402, and a mounting plate 407 is fixedly connected between the screw rod seat 405 and the guide block 404, and a plurality of electric push rods 408 are installed at the bottom of the mounting plate 407. It should be clear that the moving structure 4 is actually a structure that can drive the upper mold assembly 5 to rise and fall. There is no specific restriction in this application. Any structure that can be realized can be used, such as a threaded rod and a threaded sleeve, a gear and a rack, a chain and a sprocket, etc. Since it is a prior art, it will not be described here. It should also be clear that, as can be seen from the foregoing, the upper mold assembly 5 is connected through an electric push rod 408. Since the formation of the electric push rod 408 is limited, the movement trajectory of the upper mold assembly 5 can be increased by setting the moving structure 4. The motor 406 serves as the power source of the moving structure 4. The output end of the motor 406 is connected to the top of the screw rod 402, and a screw rod seat 405 is provided on the outer wall of the screw rod 402. The screw rod seat 405 is connected to the guide block 404 on the outer wall of the guide rod 403 through the mounting plate 407, and the electric push rod 408 is installed at the bottom end of the mounting plate 407, so it can drive the movement of the upper mold assembly 5.

[0038] The upper mold assembly 5 includes a mounting block 501, the top of which is connected to the telescopic end of the electric push rod 408, a connecting sleeve is installed at the center of the bottom of the mounting block 501, a mold connecting plate 502 is installed at the other end of the connecting sleeve, and the mold connecting plate 502 and the top of the mounting block 501 are provided with relative mounting holes, a connecting rod 504 is installed in the mounting hole, and an upper mold 503 is installed at the center of the bottom of the mold connecting plate 502. Limit rods are installed at the four corners of the bottom of the mold connecting plate 502, and a movable sleeve 505 is movably provided on the outer wall of the limit rod. A compression spring 506 is provided between the bottom end of the movable sleeve 505 and the top of the fixed block 507, and the compression spring 506 is arranged around the outer wall of the limit rod. In the embodiment of the present application, it should be clear that if Figure 7As shown, in order to be able to replace the upper mold 503, mounting holes are opened on the mounting block 501 and the mold connecting plate 502, and connecting rods 504 are installed in the mounting holes through threads. As can be seen from the foregoing, movable sleeves 505 are installed at the four corners of the bottom end of the mold connecting plate 502, and a movable limiting rod is arranged on the inner wall of the movable sleeve 505, and a compression spring 506 is arranged between the movable sleeve 505 and the fixed block 507. The compression spring 506 is arranged around the limiting rod. When the upper mold 503 is in contact with the lower mold seat 6, the fixed block 507 enters the lower pressure hole 601 opened on the top of the lower mold seat 6, the limiting rod will move into the movable sleeve 505, and the compression spring 506 will shrink with the movement, thereby having a buffering effect between the upper mold 503 and the lower mold seat 6.

[0039] like Figure 6 As shown, in order to enable the wheel hub mold 602 to maintain a stable temperature and improve the processability of the magnesium-aluminum alloy and enhance the forming quality, specifically, the lower mold base 6 includes a lower pressure hole 601 opened at the top, a through hole is opened at the center position of the top of the lower mold base 6, and the wheel hub mold 602 is arranged in the through hole, and a connecting groove 603 is opened on the inner wall of the bottom end of the wheel hub mold 602, and the connecting groove 603 is adapted to the lifting block 211, and a heating coil 604 is arranged on the outer wall of the wheel hub mold 602. It should be noted that in the embodiment of the present application, as can be seen from the foregoing, the lower mold seat 6 is connected to the fixed frame 201 by bolts, and a connecting groove 603 is opened on the inner wall of the bottom end of the hub mold 602. The connecting groove 603 can make the lifting block 211 and the bottom surface of the hub mold 602 in a flat state. At the same time, it should be clear that the lifting rod 210 passes through the hub mold 602, so that the hub formed in the hub mold 602 can be ejected, and a heating coil 604 is arranged on the outer wall of the hub mold 602. The heating coil 604 can maintain the temperature of the hub mold 602 and increase the fluidity of the magnesium-aluminum alloy. By heating the hub mold 602, the adhesion and wear of the material in the hub mold 602 can be reduced, the damage risk of the hub mold 602 is reduced, and the service life is extended. The heating coil 604 can make the hub mold 602 adapt to different types of alloy materials and molding processes, thereby improving the flexibility of production.

[0040] When using the extrusion equipment, the magnesium alloy material is first placed in the wheel hub mold 602, and then the heating coil 604 is connected to the wheel hub mold 602 through an external power supply to heat the wheel hub mold 602. Then, the motor 406 drives the screw rod 402 to rotate, and the rotating screw rod 402 drives the screw rod seat 405 to move up and down. The screw rod seat 405 drives the guide block 404 connected through the mounting plate 407 to move on the guide rod 403, thereby driving the upper mold assembly 5 to descend. When the upper mold assembly 5 is fitted with the lower mold seat 6, the upper mold 503 is extruded by the electric push rod 408. The magnesium alloy material in the wheel hub mold 602 is pressed, thereby forming the magnesium alloy material in the wheel hub mold 602 according to the mold. After forming, the upper mold assembly 5 is driven to rise by the movable structure 4, and then the motor 406 drives the threaded rod 204 to rotate. The rotating threaded rod 204 drives the threaded sleeve 206 to rise. As can be seen from the foregoing, the threaded sleeve 206 can move the sliding block 203 connected by the connecting plate 208, and a fixed plate 209 is installed between the connecting plates 208. The rise of the fixed plate 209 can drive the lifting rod 210 and the lifting block 211 to rise, thereby enabling the molded wheel hub in the wheel hub mold 602 to be ejected.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is limited by the attached embodiments and their equivalents.

Claims

1. A magnesium-aluminum alloy wheel hub extrusion device and process, comprising a fixed seat (1) and moving wheels (101) installed at the four corners of the bottom end of the fixed seat (1), characterized in that: A lifting structure (2) is arranged at the top of the fixing seat (1), the lifting structure (2) is used to lift the extruded wheel hub, and a protective cover (3) is arranged at the top of the lifting structure (2); A lower mold seat (6) is arranged at the top of the jacking structure (2), and the lower mold seat (6) is used for extrusion molding the wheel hub; A moving structure (4) is arranged on the inner wall of the top end of the protective cover (3) and is used to move the upper mold assembly (5) so as to extrude the wheel hub; An upper mold assembly (5) is arranged at the bottom end of the movable structure (4), and the upper mold assembly (5) is used to extrude the wheel hub.

2. The magnesium-aluminum alloy wheel hub extrusion equipment and process according to claim 1, characterized in that: The lifting structure (2) comprises a fixed frame (201), the fixed frame (201) being connected to the top of the fixed seat (1), and movable grooves (202) are provided on the inner walls on both sides of the longitudinal direction, and sliding blocks (203) are movably arranged in the movable grooves (202).

3. The magnesium-aluminum alloy wheel hub extrusion equipment and process according to claim 2, characterized in that: A threaded rod (204) and a support rod (205) are provided between the inner side of the top of the fixed frame (201) and the top of the fixed seat (1); the threaded rod (204) is located on the left side of the fixed seat (1); a threaded sleeve (206) is threadedly connected to the outer wall of the threaded rod (204); a moving block (207) is movably provided on the outer wall of the support rod (205); a connecting plate (208) is fixedly connected between the outer side of the threaded sleeve (206) and the outer side of the sliding block (203); and another connecting plate (208) is fixedly connected between the outer side of the moving block (207) and the outer wall of another sliding block (203).

4. The magnesium-aluminum alloy wheel hub extrusion equipment and process according to claim 3, characterized in that: A fixing plate (209) is fixedly connected between the connecting plates (208), and a lifting rod (210) is installed at the center position of the top end of the fixing plate (209), and the top end of the lifting rod (210) penetrates the top outer wall of the fixing frame (201) and is threadedly connected to a lifting block (211).

5. The magnesium-aluminum alloy wheel hub extrusion equipment and process according to claim 1, characterized in that: The movable structure (4) comprises a support plate (401), the support plate (401) being connected to the inner sides of both ends of the protective cover (3), and a screw rod (402) and a guide rod (403) are respectively arranged between the top end of the support plate (401) and the inner wall of the top end of the protective cover (3), and a motor (406) is installed at the top end of the protective cover (3).

6. The magnesium-aluminum alloy wheel hub extrusion equipment and process according to claim 5, characterized in that: The outer wall of the screw rod (402) is threadedly provided with a screw rod seat (405), the outer wall of the guide rod (403) is movably provided with a guide block (404), the output end of the motor (406) is connected to the top end of the screw rod (402), a mounting plate (407) is fixedly connected between the screw rod seat (405) and the guide block (404), and a plurality of electric push rods (408) are installed at the bottom end of the mounting plate (407).

7. The magnesium-aluminum alloy wheel hub extrusion equipment and process according to claim 1, characterized in that: The upper mold assembly (5) comprises a mounting block (501), the top of the mounting block (501) being connected to the telescopic end of the electric push rod (408), a connecting sleeve being installed at the center of the bottom of the mounting block (501), a mold connecting plate (502) being installed at the other end of the connecting sleeve, and corresponding mounting holes being provided at the tops of the mold connecting plate (502) and the mounting block (501), a connecting rod (504) being installed in the mounting hole, and an upper mold (503) being installed at the center of the bottom of the mold connecting plate (502).

8. The magnesium-aluminum alloy wheel hub extrusion equipment and process according to claim 7, characterized in that: A movable sleeve (505) is installed at the four corners of the bottom end of the mold connecting plate (502), a limit rod is movably arranged on the inner wall of the movable sleeve (505), a compression spring (506) is arranged between the bottom end of the movable sleeve (505) and the top end of the fixed block (507), and the compression spring (506) is arranged around the outer wall of the limit rod.

9. The magnesium-aluminum alloy wheel hub extrusion equipment and process according to claim 1, characterized in that: The lower mold base (6) includes a lower pressing hole (601) opened at the top, a through hole is opened at the center position of the top of the lower mold base (6), a hub mold (602) is arranged in the through hole, a connecting groove (603) is opened on the inner wall of the bottom end of the hub mold (602), the connecting groove (603) is compatible with the lifting block (211), and a heating coil (604) is arranged on the outer wall of the hub mold (602).

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