Extrusion die

Abstract

The utility model discloses an extrusion die which comprises a pre-extrusion die, the pre-extrusion die comprises a pre-extrusion upper die and a pre-extrusion lower die which are oppositely buckled and matched, the pre-extrusion lower die is provided with a concave first cavity, the first cavity comprises a first cavity body and a second cavity body communicated with the first cavity body, and the first cavity body is matched with a base in boundary dimension; the second cavity is matched with the connecting frame in boundary dimension; the pre-extrusion upper die is provided with a first boss, the first boss is matched with the first cavity, and the first boss is embedded into the first cavity to form a closed pre-forming cavity; the final extrusion die comprises a final extrusion upper die and a final extrusion lower die which are oppositely buckled and matched, the final extrusion lower die is provided with a concave second cavity, the second cavity is matched with the preformed blank, the final extrusion upper die is provided with a second boss, the second boss is matched with the second cavity, and the second boss is embedded into the second cavity to form a closed final forming cavity. The complete rail seat can be directly extruded through the mold in the two stages of pre-forming and final forming, and the manufacturing process is simplified.

Description

Technical Field

[0001] This utility model relates to the technical field of forging dies, and in particular to an extrusion die. Background Technology

[0002] Currently, the rail base used in the middle trough of the scraper conveyor includes a rail base and a connecting block. One side of the rail base is fixedly connected to one end of the connecting block. The rail base is a box with both the top and bottom surfaces open. For the production of such irregular and multifaceted parts, if the rail base is made by casting, the flash needs to be machined. If the rail base is made by forging, the rail base needs to be welded firmly to the connecting block. Therefore, the process is complicated. Utility Model Content

[0003] The purpose of this invention is to provide an extrusion die that can directly extrude a complete rail seat through a two-stage die process of pre-forming and final forming, thereby achieving integrated extrusion forming of the rail seat, simplifying the manufacturing process, avoiding welding the base and connecting frame, and preventing metal material from flowing out of the die cavity during the extrusion process and causing flash.

[0004] This utility model provides an extrusion die for manufacturing a rail base for a coal mining machine. The rail base includes a base and a connecting frame protruding from one side of the base. The extrusion die includes a pre-extrusion die, which includes a pre-extrusion upper die and a pre-extrusion lower die that are fitted together. The pre-extrusion lower die has a recessed first cavity, which includes a first cavity body and a second cavity body communicating with the first cavity body. The first cavity body is adapted to the outer dimensions of the base, and the second cavity body is adapted to the outer dimensions of the connecting frame. The pre-extrusion upper die has a protruding first boss, which is adapted to the first cavity body and is embedded in the first cavity body to form a closed pre-formed cavity body. The pre-formed cavity body is used to accommodate the material to be extruded. The heated preform is placed in the first cavity, and the pre-extrusion upper die and the pre-extrusion lower die are closed to extrude the preform to obtain a preformed blank; the final extrusion die includes a final extrusion upper die and a final extrusion lower die that are fitted together, the final extrusion lower die has a recessed second cavity that is adapted to the preformed blank, the final extrusion upper die has a protruding second boss that is adapted to the second cavity, and the second boss is embedded in the second cavity to form a closed final forming cavity; the final forming cavity is used to accommodate the forming rail obtained by placing the preformed blank in the second cavity and extruding the preformed blank after the final extrusion upper die and the final extrusion lower die are closed.

[0005] Furthermore, the bottom surface of the first cavity is provided with a groove for positioning the preform; wherein, the axial length of the groove extends sequentially along the first cavity and the second cavity; the preform is placed in the groove, and the preform is not higher than the top surface of the pre-extrusion upper die.

[0006] Furthermore, two protruding third protrusions are arranged side by side on the second protrusion, with the two third protrusions spaced apart; the bottom surface of the second cavity is provided with a protruding fourth protrusion, the fourth protrusion being positioned corresponding to the third protrusion, so that when the preformed blank is extruded after the final extrusion upper die and final extrusion lower die are closed, a first hole and a second hole coaxially formed in the middle of the forming base, and a rib is formed between the two side by side first holes; the first hole and the second hole are not interconnected; a protruding fifth protrusion is provided on the second protrusion, so that when the preformed blank is extruded after the final extrusion upper die and final extrusion lower die are closed, a corresponding recess is formed at the forming connecting frame.

[0007] Furthermore, the extrusion die also includes an extrusion punch adapted to the first hole and the second hole, so that during use, the extrusion punch passes through the base formed by the extrusion through the first hole, thereby connecting the first hole and the second hole.

[0008] Furthermore, a notch is provided at the fifth boss, which is located on the side of the fifth boss close to the third boss, so that when the preformed blank is extruded after the final extrusion upper die and the final extrusion lower die are closed, a corresponding reinforcing rib is formed at the forming connecting frame; wherein, the top surface of the reinforcing rib is connected and fixed to the connecting frame, and the side surface of the reinforcing rib is connected and fixed to the base.

[0009] Furthermore, the sidewalls of the first cavity and the second cavity are designed to gradually slope upwards from the bottom along the direction away from the cavity, with the angle of inclination set to 1°-3°; the right angle between the first cavity and the second cavity is designed to be a rounded transition.

[0010] Furthermore, the bottom of the first cavity is provided with multiple vertically penetrating first holes, which are located on both sides of the groove and are spaced apart along the axial direction of the groove. The first holes are used to accommodate ejector rods, which are configured to move vertically. When the ejector rods move upward, they eject the preformed blank from the first cavity. The bottom of the second cavity is provided with multiple vertically penetrating second holes, which are located on both sides of the fourth boss and are spaced apart along the length of the fourth boss. The second holes are used to accommodate ejector rods, which are configured to move vertically. When the ejector rods move upward, they eject the forming rail from the second cavity.

[0011] Furthermore, the height of the preform is lower than the depth of the second cavity; the volume of the preform is 95%-98% of the final forming cavity.

[0012] Furthermore, the length and width of the preformed blank are set to be less than the forming rail seat, and the height of the preformed blank is set to be greater than the forming rail seat. When the final extrusion upper die and the final extrusion lower die are closed and the preformed blank is extruded, the material extruded from the recess, the first hole and the second hole flows into the final forming cavity, thereby obtaining the forming rail seat.

[0013] Furthermore, the final extrusion die is equipped with a temperature control module, which is used to adjust the temperature of the final extrusion die in real time to optimize the material flowability when extruding the preformed billet.

[0014] The above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0015] 1. In this embodiment of the present invention, when a bar of a certain length is placed in the connected first cavity and second cavity, the bar is not higher than the pre-extrusion lower die. The first cavity is used to form the blank of the base part, and the second cavity is used to form the blank of the connecting frame part. After the pre-extrusion upper die and pre-extrusion lower die are closed, the heated bar is extruded. The metal material can flow in the closed pre-forming cavity formed by the first boss embedding into the first cavity, and a pre-formed blank can be obtained. The pre-formed blank after extrusion has the advantage of material uniformity. The length and width of the pre-formed blank can be set to be smaller than the forming rail seat, and the height of the pre-formed blank can be set to be slightly larger than the forming rail seat. When the pre-formed blank is placed in the first cavity, the first cavity is used to form the base part, and the second cavity is used to form the blank of the connecting frame part. In the two-cavity molding process, the height of the preformed blank is set lower than that of the second cavity. After the final extrusion upper die and the final extrusion lower die are closed, the preformed blank is extruded. The metal material flows in the closed final forming cavity formed by the second boss embedded in the second cavity, thus obtaining the formed rail seat. In this way, the metal material flows continuously along the axial direction during the extrusion process, maintaining the integrity of the forging flow line, which can improve the wear resistance and impact resistance of the stress parts of the rail seat. Furthermore, through the two-stage mold of preforming and final forming, the complete rail seat can be directly extruded, realizing the integrated extrusion forming of the rail seat, simplifying the manufacturing process, avoiding welding the base and connecting frame, and also avoiding the metal material flowing out of the mold cavity during the extrusion process, causing flash.

[0016] 2. In this embodiment of the utility model, in the process of making the forming rail base using an extrusion mold, the welding treatment between the base and the connecting frame is eliminated, as well as the flash that would occur around the product after forming due to the metal material flowing out of the cavity is prevented. Therefore, the flash treatment can be eliminated, which simplifies the manufacturing process and shortens the production cycle by 40%. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of the pre-extrusion mold according to the first embodiment of the present utility model;

[0018] Figure 2 This is a structural schematic diagram of the pre-extrusion mold according to the second embodiment of the present utility model;

[0019] Figure 3 This is a structural schematic diagram of the pre-extrusion upper die according to the third embodiment of the present utility model;

[0020] Figure 4 This is a structural schematic diagram of the pre-extrusion lower die according to the fourth embodiment of the present utility model;

[0021] Figure 5 This is a structural schematic diagram of the final extrusion die according to the fifth embodiment of the present utility model;

[0022] Figure 6 This is a structural schematic diagram of the final extrusion die according to the sixth embodiment of this utility model;

[0023] Figure 7 This is a structural schematic diagram of the final extrusion die according to the seventh embodiment of the present utility model;

[0024] Figure 8 This is a structural schematic diagram of the final extrusion die according to the eighth embodiment of the present utility model;

[0025] Figure 9 This is a structural schematic diagram of the final extrusion die according to the ninth embodiment of this utility model;

[0026] Figure 10 This is a structural schematic diagram of the final extrusion upper die according to the tenth embodiment of this utility model;

[0027] Figure 11 This is a structural schematic diagram of the final extrusion die according to the eleventh embodiment of this utility model;

[0028] Figure 12 This is a schematic diagram of the structure of the molding track seat according to the twelfth embodiment of the present utility model;

[0029] Figure label:

[0030] 10. Preformed billet; 11. Pre-extrusion upper die; 12. Pre-extrusion lower die; 13. First cavity; 131. First cavity body; 132. Second cavity body; 14. First boss; 15. Preformed billet; 16. Final extrusion upper die; 17. Final extrusion lower die; 18. Second cavity; 19. Second boss; 20. Groove; 21. Third boss; 22. Fourth boss; 23. Fifth boss; 24. First through hole; 25. Second through hole; 26. Ejector rod; 27. Notch; 30. Forming rail seat; 31. Base; 32. Connecting frame. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the present utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model. In this document, terms such as first, second, and third are used only to distinguish one feature from another and are not intended to claim or imply any order or association between these features.

[0032] Currently, the rail base used in the middle trough of the scraper conveyor includes a rail base and a connecting block. One side of the rail base is fixedly connected to one end of the connecting block. The rail base is a box with both the top and bottom surfaces open. For the production of such irregular and multifaceted parts, if the rail base is made by casting, the flash needs to be machined. If the rail base is made by forging, the rail base needs to be welded firmly to the connecting block. Therefore, the process is complicated.

[0033] An embodiment of this utility model provides an extrusion die for manufacturing the rail base of a coal mining machine, such as... Figure 12 As shown, the rail base includes a base 31 and a connecting bracket 32 ​​protruding from one side of the base 31, as... Figures 1-11 As shown, the extrusion die includes a pre-extrusion die and a final extrusion die. The pre-extrusion die includes a pre-extrusion upper die 11 and a pre-extrusion lower die 12 that are fitted together. The pre-extrusion lower die 12 has a recessed first cavity 13, which includes a first cavity 131 and a second cavity 132 communicating with the first cavity 131. The first cavity 131 is adapted to the outer dimensions of the base 31, and the second cavity 132 is adapted to the outer dimensions of the connecting frame 32. The pre-extrusion upper die 11 has a protruding first boss 14, which is adapted to the first cavity 13 and is embedded in the first cavity 13 to form a closed pre-forming cavity. The pre-forming cavity is used to accommodate the heated preform 10 placed in the first cavity 13. The pre-extrusion upper die 11 and the pre-extrusion lower die 12 are fitted together. After the mold 12 is closed, the preformed blank 10 is extruded to obtain a preformed blank 15; the final extrusion mold includes a final extrusion upper mold 16 and a final extrusion lower mold 17 that are fitted together. The final extrusion lower mold 17 is provided with a recessed second cavity 18, which is adapted to the preformed blank 15. The final extrusion upper mold 16 is provided with a protruding second boss 19, which is adapted to the second cavity 18. The second boss 19 is embedded in the second cavity 18 to form a closed final forming cavity. The final forming cavity is used to accommodate the forming base 30 obtained by placing the preformed blank 15 in the second cavity 18 and extruding the preformed blank 15 after the final extrusion upper mold 16 and the final extrusion lower mold 17 are closed.

[0034] Specifically, the pre-extrusion die and the final extrusion die are independently designed, allowing for two stations on the forging equipment: pre-extrusion and final extrusion. A conveying mechanism transfers the pre-formed billet 15 to the final extrusion station, making it suitable for continuous production lines. Alternatively, a single station can be set up on the forging equipment, where the pre-extrusion die is replaced with the final extrusion die to extrude the billet and obtain the forming rail seat 30, reducing the equipment footprint. Both the top of the upper die and the bottom of the lower die can be equipped with threaded connection mounting holes for installation on the forging equipment. The preform 10 can be, for example, a bar stock. The preform 10 can be heated to 850-1200℃. Since there is no material loss during the extrusion molding process in this embodiment of the invention, the weight of the preform 10 and the weight of the forming rail 30 are equal. Therefore, the volume of the preform 10 can be calculated based on its weight, and thus, for example, the diameter and length of the bar stock can be determined. When a bar stock of a certain length is placed in the connected first cavity 131 and second cavity 132, the bar stock is not higher than the pre-extrusion lower die 12. The first cavity 131 is used for forming the blank of the forming base 31 part, and the second cavity 132 is used for forming the blank of the forming connecting frame 32 part. After the pre-extrusion upper die 11 and pre-extrusion lower die 12 are closed, the heated bar stock is extruded. The metal material can flow in the closed pre-forming cavity formed by the first boss 14 embedded in the first cavity 13, and a pre-formed blank 15 can be obtained. The pre-formed blank 15 after extrusion... With the advantage of material uniformity, the length and width of the preformed blank 15 can be set to be smaller than the forming rail seat 30, and the height of the preformed blank 15 can be set to be slightly larger than the forming rail seat 30. When the preformed blank 15 is placed in the second cavity 18, and the height of the preformed blank 15 is set to be lower than the second cavity 18, the preformed blank 15 is extruded after the final extrusion upper die 16 and the final extrusion lower die 17 are closed. The metal material flows in the closed final forming cavity formed by the second boss 19 embedded in the second cavity 18, and the forming rail seat 30 can be obtained. In this way, the metal material flows continuously along the axial direction during the extrusion process, maintaining the integrity of the forging flow line, which can improve the wear resistance and impact resistance of the stress part of the rail seat. Furthermore, through the two stages of preforming and final forming, the complete rail seat can be directly extruded, realizing the integrated extrusion forming of the rail seat. This avoids welding the base 31 and the connecting frame 32, and also avoids the metal material flowing out of the mold cavity during the extrusion process, causing flash.

[0035] In some embodiments, the bottom surface of the first cavity 13 is provided with a groove 20, which is used to position the preform 10. The axial length of the groove 20 extends sequentially along the first cavity 131 and the second cavity 132. The preform 10 is placed in the groove 20, and the preform 10 is not higher than the top surface of the pre-extrusion upper die 11. Specifically, when the preform 10 is a bar stock, the groove 20 can be arc-shaped and adapted to the bar stock. The groove 20 positions the preform 10, and during the extrusion process of the heated bar stock after the pre-extrusion upper die 11 and pre-extrusion lower die 12 are closed, it can prevent the preform 10 from deviating and causing unevenness of the preform 10 obtained after extrusion.

[0036] In some embodiments, two protruding third protrusions 21 are arranged side by side on the second protrusion 19, and the two third protrusions 21 are spaced apart; the bottom surface of the second cavity 18 is provided with a protruding fourth protrusion 22, the fourth protrusion 22 is positioned corresponding to the third protrusion 21, so that when the final extrusion upper die 16 and the final extrusion lower die 17 are closed and the preformed blank 15 is extruded, a first hole and a second hole coaxially formed in the middle of the forming base 31 are formed, and a rib is formed between the two side by side first holes; the first hole and the second hole are not interconnected; a protruding fifth protrusion 23 is provided on the second protrusion 19, so that when the final extrusion upper die 16 and the final extrusion lower die 17 are closed and the preformed blank 15 is extruded, a corresponding recess is formed at the forming connecting frame 32. Specifically, both the third boss 21 and the fourth boss 22 can be square to make the first and second holes of the extrusion forming square. Setting the third boss 21 and the fourth boss 22 is beneficial to the forming of the first and second holes and also to the flow of metal material during the extrusion process. The third boss 21 can be inclined along the height direction, which is beneficial to demolding. The fifth boss 23 is set higher than the third boss 21 and is recessed more deeply on the bottom surface of the second cavity 18 corresponding to the connecting frame. After the final extrusion upper die 16 and the final extrusion lower die 17 are closed, the fifth boss 23 extrudes the preformed blank 15, forming a corresponding recess at the formed connecting frame 32. The metal material extruded from the recess flows into the final forming cavity to obtain the overall forming base 30. Among them, the top surface of the formed connecting frame 32 is higher than the base 31. Correspondingly, the top surface of the formed base 31 has protruding teeth, and the bottom surface of the second cavity 18 has a corresponding recess. The shapes of other parts of the forming guide 30 can be designed according to the final extrusion upper die 16 and final extrusion lower die 17. Therefore, by optimizing the matching degree between the external dimensions of the preformed blank 15 and the final forming cavity, it is possible to ensure uniform flow of metal material and avoid stress concentration.

[0037] In some embodiments, a notch 27 is provided at the fifth boss 23. The notch 27 is located on the side of the fifth boss 23 close to the third boss 21, so that when the final extrusion upper die 16 and the final extrusion lower die 17 are closed and the preformed blank 15 is extruded, a corresponding reinforcing rib is formed at the forming connecting frame 32. The top surface of the reinforcing rib is connected and fixed to the connecting frame 32, and the side surface of the reinforcing rib is connected and fixed to the base 31.

[0038] In some embodiments, the extrusion die further includes an extrusion punch adapted to the first and second holes, so that during use, the extrusion punch passes through the base 31 formed by extrusion through the first hole, thereby connecting the first and second holes. After the first and second holes are closed by the final extrusion upper die 16 and the final extrusion lower die 17, the thickness of the skin after extruding the preformed blank 15 can be set to 10-15mm. The extrusion punch passes through the first hole and punches away the skin thickness, thereby connecting the first and second holes.

[0039] In some embodiments, the sidewalls of the first cavity 13 and the second cavity 18 are designed to gradually slope upwards from the bottom away from the cavity, with an angle of 1°-3°; the right angles of the first cavity 13 and the second cavity 18 are rounded. The inner walls of the pre-extrusion die 12 and the final extrusion die 17 are designed to slope outwards at an angle of 1°-3° from bottom to top, thus the tapered die cavity design can reduce demolding resistance. Each right angle of the first cavity 13 and the second cavity 18 can be rounded, which makes the metal material flow path smoother, reduces defects, and reduces demolding resistance and improves demolding efficiency.

[0040] Traditional molds rely on manual prying to remove parts, resulting in severe mold wear and low demolding efficiency. Therefore, in this embodiment, the bottom of the first cavity 13 is provided with multiple vertically penetrating first through holes 24. These first through holes 24 are located on both sides of the groove 20 and are spaced apart along the axial direction of the groove 20. The first through holes 24 are used to accommodate ejector rods 26, which are configured to move vertically. When the ejector rods 26 move upwards, they eject the preform 10 from the first cavity 13. The bottom of the second cavity 18 is provided with multiple vertically penetrating second through holes 25. These second through holes 25 are located on both sides of the fourth boss 22 and are spaced apart along the length of the fourth boss 22. The second through holes 25 are used to accommodate ejector rods 26, which are configured to move vertically. When the ejector rods 26 move upwards, they eject the forming guide 30 from the second cavity 18. Specifically, an adaptive ejector system can be configured for demolding. The ejector rod 26 is configured to move up and down. The ejector rod 26 can be driven by components such as a motor, electric push rod, or cylinder. The ejector rod 26 can move up and down along the first through hole 24. When the ejector rod 26 moves upward, it ejects the preform 10 out of the first cavity 13. There are multiple ejector rods 26, which are distributed on both sides of the groove 20 at intervals. The ejector rods 26 can move in stages to eject the blank, so that the blank is subjected to uniform force and avoids local stress damage to the mold. Similarly, the ejector rod 26 can move up and down along the second through hole 25. When the ejector rod 26 moves upward, it ejects the forming rail seat 30 out of the second cavity 18. There are multiple ejector rods 26, which are distributed on both sides of the fourth boss 22 at intervals. The ejector rods 26 can move in stages to eject the forming rail seat 30, so that the blank is subjected to uniform force and avoids local stress damage to the mold. Furthermore, the use of a tapered mold cavity in conjunction with an ejector pin 26 enables rapid and non-destructive demolding.

[0041] In some embodiments, the height of the preformed blank 15 is lower than the depth of the second cavity 18; the volume of the preformed blank 10 is 95%-98% of the final forming cavity. When the preformed blank 15 is placed in the second cavity 18, with the height of the preformed blank 15 set to be lower than the second cavity 18, the heated preformed blank 15 is extruded after the final extrusion upper die 16 and final extrusion lower die 17 are closed. The metal material flows within the closed final forming cavity formed by the second boss 19 embedded in the second cavity 18, thus forming a forming guide 30. This prevents flash from appearing around the product after forming due to the metal material flowing out of the second cavity 18, avoiding material loss. The shape of the final forming cavity is consistent with that of the forming guide 30, and the volume of the forming guide 30 is equal to the volume of the preformed blank 10. The volume of the preformed blank 10 is 95%-98% of the final forming cavity, that is, the volume of the final forming cavity is slightly larger than the volume of the preformed blank 10. This allows for natural shrinkage compensation during extrusion, eliminating material defects.

[0042] In some embodiments, the length and width of the preformed blank 15 are set to be less than the forming rail 30, and the height of the preformed blank 15 is set to be greater than the forming rail 30. When the final extrusion upper die 16 and the final extrusion lower die 17 are closed and the preformed blank 15 is extruded, the material extruded from the recess, the first hole and the second hole flows into the final forming cavity, thereby obtaining the forming rail 30. Specifically, the length and width of the preformed blank 15 can be set to be less than the forming guide 30, and the height of the preformed blank 15 can be set to be slightly greater than the forming guide 30. When the preformed blank 15 is placed in the second cavity 18, and the height of the preformed blank 15 is set to be lower than the second cavity 18, the preformed blank 15 is extruded after the final extrusion upper die 16 and the final extrusion lower die 17 are closed. The metal material flows into the closed final forming cavity formed by the second boss 19 embedded in the second cavity 18, and the forming guide 30 can be obtained. In this way, the metal material extruded from the recess, the first hole and the second hole during the extrusion process flows into the final forming cavity, and thus the forming guide 30 is obtained. In this way, material waste is avoided in the processing of the forming guide 30. Compared with the traditional processing method, the metal material utilization rate is increased by 35%, the die life is extended by 50%, and the production cost can be reduced.

[0043] In some embodiments, the final extrusion die is equipped with a temperature control module. This module is used to adjust the temperature of the final extrusion die in real time to optimize the material flowability during the extrusion of the preformed billet 15. By adjusting the temperature of the final extrusion die in real time, the heating temperature of the preformed billet 15 can be effectively controlled, thereby optimizing the material flowability during the extrusion of the preformed billet 15. This ensures that the metal material flows continuously along the axial direction during the extrusion process, maintaining the integrity of the forging flow lines, which can increase the product fatigue life by 30% and thus effectively improve the product strength.

[0044] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. An extrusion die, characterized in that, For manufacturing a rail base for a coal mining machine, the rail base includes a base and a connecting frame protruding from one side of the base, and the extrusion die includes: A pre-extrusion die includes a pre-extrusion upper die and a pre-extrusion lower die that are fitted together. The pre-extrusion lower die has a recessed first cavity, which includes a first cavity body and a second cavity body communicating with the first cavity body. The first cavity body is adapted to the outer dimensions of a base, and the second cavity body is adapted to the outer dimensions of a connecting frame. The pre-extrusion upper die has a protruding first boss, which is adapted to the first cavity body and is embedded in the first cavity body to form a closed pre-forming cavity body. The pre-forming cavity body is used to accommodate a preformed blank obtained by placing a heated preformed blank in the first cavity body and extruding the preformed blank body after the pre-extrusion upper die and the pre-extrusion lower die are closed. The final extrusion die includes a final extrusion upper die and a final extrusion lower die that are fitted together. The final extrusion lower die has a recessed second cavity that is adapted to the preformed blank. The final extrusion upper die has a protruding second boss that is adapted to the second cavity. The second boss is embedded in the second cavity to form a closed final forming cavity. The final forming cavity is used to accommodate the forming guide seat obtained by placing the preformed blank in the second cavity and extruding the preformed blank after the final extrusion upper die and the final extrusion lower die are closed.

2. The extrusion die according to claim 1, characterized in that, The bottom surface of the first cavity is provided with a groove for positioning the preform; wherein, the axial length of the groove extends sequentially along the first cavity and the second cavity. The precast blank is placed in the groove, and the precast blank is not higher than the top surface of the pre-extrusion upper die.

3. The extrusion die according to claim 1, characterized in that, Two protruding third protrusions are arranged side by side on the second protrusion, with the two third protrusions spaced apart from each other; The bottom surface of the second cavity is provided with a protruding fourth boss, which corresponds to the position of the third boss. This allows the preformed blank to be extruded after the final extrusion upper die and final extrusion lower die are closed. A first hole and a second hole coaxially formed in the middle of the forming base are formed, and a rib is formed between the two parallel first holes. The first hole and the second hole are not connected to each other. The second protrusion is provided with a protruding fifth protrusion, so that when the preformed blank is extruded after the final extrusion upper die and the final extrusion lower die are closed, a corresponding recess is formed at the forming connecting frame.

4. The extrusion die according to claim 3, characterized in that, A notch is provided at the fifth boss, which is located on the side of the fifth boss close to the third boss, so that when the preformed blank is extruded after the final extrusion upper die and final extrusion lower die are closed, a corresponding reinforcing rib is formed at the forming connecting frame; wherein, the top surface of the reinforcing rib is connected and fixed to the connecting frame, and the side surface of the reinforcing rib is connected and fixed to the base.

5. The extrusion die according to claim 1, characterized in that, The sidewalls of the first and second cavities are designed to gradually slope upwards from the bottom along the direction away from the cavity, with the angle of inclination set to 1°-3°. The right angle between the first cavity and the second cavity is set as a rounded transition.

6. The extrusion die according to claim 3, characterized in that, The bottom of the first cavity is provided with a plurality of first holes that extend vertically. The first holes are located on both sides of the groove and are spaced apart along the axial direction of the groove. The first holes are used to accommodate the ejector rod, which is configured to move vertically. When the ejector rod moves upward, it ejects the preform from the first cavity. The bottom of the second cavity is provided with multiple second holes that run vertically through it. The second holes are located on both sides of the fourth boss and are spaced apart along the length of the fourth boss. The second holes are used to accommodate the ejector rod, which is configured to move vertically. When the ejector rod moves upward, it pushes the forming rail seat out of the second cavity.

7. The extrusion die according to claim 3, characterized in that, Also includes: An extrusion punch is adapted to fit the first hole and the second hole so that, during use, the extrusion punch passes through the base formed by extrusion through the first hole, thereby connecting the first hole and the second hole.

8. The extrusion die according to claim 1, characterized in that, The height of the preform is lower than the depth of the second cavity; The volume of the preform is 95%-98% of the final forming cavity.

9. The extrusion die according to claim 3, characterized in that, The length and width of the preformed blank are set to be less than the forming rail seat, and the height of the preformed blank is set to be greater than the forming rail seat. When the final extrusion upper die and the final extrusion lower die are closed and the preformed blank is extruded, the material extruded from the recess, the first hole and the second hole flows into the final forming cavity, thereby obtaining the forming rail seat.

10. The extrusion die according to any one of claims 1-9, characterized in that, The final extrusion die is equipped with a temperature control module, which is used to adjust the temperature of the final extrusion die in real time to optimize the material flowability when extruding the preformed billet.

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