Gear high temperature extrusion forming device

Abstract

The present invention relates to a high-temperature extrusion forming device for gears, comprising a base, a lower hydraulic cylinder is arranged on the base, the lower hydraulic cylinder is connected to a second driving mechanism, a support plate is arranged at the top of the lower hydraulic cylinder, and a positioning column is arranged on the upper surface of the support plate; a die seat is arranged above the support plate, and a die core is arranged on the upper surface of the die seat, and the die core comprises a lower forming section and an upper forming section, a lower forming cavity is arranged inside the lower forming section, a notch is arranged on the side wall of the lower forming cavity, a first forming tooth is arranged in the notch, and the first forming tooth is connected to a first driving mechanism, an upper forming cavity is arranged inside the upper forming section, and a plurality of second forming teeth are arranged on the side wall of the upper forming cavity; a pressure head is arranged above the die core, and the pressure head is connected to a pressure mechanism. Compared with traditional forging forming, the present invention can be carried out at a lower temperature, and improves the uniformity of deformation of each part of the gear blank, reduces the risk of cracks, and ensures the qualified rate.

Description

Technical Field

[0001] The invention belongs to the field of gear production equipment, in particular to a gear high-temperature extrusion forming device. Background Art

[0002] There are two main gear production processes, one is machining and the other is extrusion. Existing extrusion is divided into high temperature forging and cold extrusion. Among them, cold extrusion has high precision, but it is carried out at room temperature. Due to the poor plasticity of the material at room temperature and the large deformation resistance, it is only suitable for smaller gears. High temperature forging can be used to produce larger gears, but it usually requires the gears to be heated to above 800 degrees Celsius. The temperature is high and the energy consumption is high. The gear temperature drops rapidly during the forging process. The initial forging temperature during forging is high because if the temperature is low, the deformation resistance will increase. When the gear size is large, the deformation is also large, which is prone to cracks. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a high-temperature extrusion forming device for gears, which can be carried out at a lower temperature than traditional forging, and improves the uniformity of deformation of various parts of the gear blank, reduces the risk of cracks, and ensures the qualified rate.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is: a gear high-temperature extrusion forming device, including a base, a rotatable lower hydraulic cylinder is vertically arranged on the base, the lower hydraulic cylinder is connected to a second driving mechanism that drives the lower hydraulic cylinder to rotate, a support plate is arranged on the top of the lower hydraulic cylinder, and a positioning column is arranged at the center of the upper surface of the support plate; a die base is arranged above the support plate, a feed through hole is arranged on the die base, a die core is arranged on the upper surface of the die base, the die core includes a lower forming section and an upper forming section, a lower forming cavity is arranged inside the lower forming section, a notch is arranged on the side wall of the lower forming cavity and vertically penetrates the lower forming section, and a first forming hole is arranged in the notch forming teeth, the first forming teeth are connected to a first driving mechanism for driving the first forming teeth to move radially along the lower forming cavity, the first forming teeth are used to form a plurality of prefabricated tooth grooves on the outer wall of the gear blank; an upper forming cavity is arranged inside the upper forming section, the inner diameter of the upper forming cavity is larger than the inner diameter of the lower forming cavity, a plurality of second forming teeth are arranged on the side wall of the upper forming cavity, the number of the second forming teeth is the same as the number of the prefabricated tooth grooves, and the size of the second forming teeth is smaller than the size of the prefabricated tooth grooves; a pressure head is arranged above the mold core, the pressure head is connected to a pressure mechanism, a guide blind hole is arranged on the lower surface of the pressure head, and the guide blind hole, the upper forming cavity, the lower forming cavity, the feed through hole and the positioning column are coaxial.

[0005] Furthermore, a preheating mechanism surrounding the feed through hole is arranged in the mold base.

[0006] Furthermore, the feed through hole is in a truncated cone shape, and the diameter of the upper port of the feed through hole is smaller than the diameter of the lower port, and the diameter of the upper port of the feed through hole is the same as the diameter of the lower forming cavity.

[0007] Furthermore, a horizontal guide rail is provided on the base, a first slide and a second slide which are slidably matched with the guide rail are provided on the guide rail, the first slide and the second slide are respectively connected to a third driving mechanism and a fourth driving mechanism, the lower hydraulic cylinder and the second driving mechanism are provided on the first slide, a vertical ejection hydraulic cylinder is provided on the second slide, an ejection block is provided on the upper end of the ejection hydraulic cylinder; a heating assembly is provided on the side of the mold base away from the ejection block.

[0008] Furthermore, the upper port of the upper forming cavity is provided with a first sealing bevel, the outer side wall of the pressure head is provided with a sealing cylinder that slides and seals with the pressure head, the lower surface of the sealing cylinder is provided with a second sealing bevel, a sealing gasket is provided on the second sealing bevel, and a spring is provided on the upper surface of the sealing cylinder; the outer wall of the support plate is provided with an annular sealing groove, and a sealing ring is provided in the sealing groove.

[0009] Furthermore, the outer diameter of the ejector block is smaller than the inner diameter of the upper forming cavity, and the outer wall of the ejector block is provided with a circular mounting groove, in which a plurality of atomizing nozzles are provided, the atomizing nozzles are connected with a hose, the hose is connected with a release agent storage container, and a driving pump is provided on the hose.

[0010] Furthermore, the heating component is an electromagnetic induction heating mechanism.

[0011] Furthermore, the first driving mechanism is a hydraulic cylinder.

[0012] Furthermore, the third driving mechanism and the fourth driving mechanism are hydraulic cylinders.

[0013] Furthermore, the second driving mechanism is a stepping motor.

[0014] The beneficial effects of the present invention are:

[0015] The traditional gear extrusion method is: put the blank on the die, the axial direction of the blank is in a vertical state, then pressurize the upper surface of the blank, press the blank into the forming cavity of the die, the side wall of the forming cavity is provided with multiple forming bosses, the forming bosses extrude the blank to form tooth grooves, and a tooth shape is formed between two adjacent forming bosses. In this extrusion method, when the blank is deformed, the material flow path along the axial direction is too long, the deformation is large, it is easy to tear and produce cracks, the material flow in various parts of the blank is uneven, and the gear stress is large.

[0016] In the present invention, gear extrusion forming includes two processes. The first process is: using the first driving mechanism to push the first forming tooth to move radially, forming a prefabricated tooth groove on the gear surface, and the size of the prefabricated tooth groove is larger than the design size of the gear tooth groove; the second process is: using the lower hydraulic cylinder to push the gear blank into the upper forming cavity, and then using the pressure mechanism to push the pressure head into the upper forming cavity to extrude the gear to form a tooth shape between two adjacent second forming teeth.

[0017] Before extrusion, the gear is heated to 500-600 degrees Celsius. At a higher temperature, the deformation resistance of the gear blank is smaller, which is conducive to rapid forming. In the first process, the outer diameter of the gear blank is adapted to the diameter of the lower forming cavity, so that the outer wall of the gear blank can fit the inner wall of the lower forming cavity. When the outer wall of the gear blank is radially extruded, the extruded part flows upward in the axial direction, so that the axial length of the gear blank increases. In the second process, the diameter of the lower forming cavity is larger than the outer diameter of the gear blank. The two ends of the gear blank are under pressure, and the diameter gradually increases. At the same time, the material of the gear blank flows radially, filling the space between the two adjacent second forming teeth, and fitting the second forming teeth at the same time. During the entire extrusion process, the deformation of various parts of the gear blank is relatively uniform, and there is no problem of large local deformation, thereby effectively avoiding local tearing, preventing cracks, and ensuring the forming quality of the gear, so that the present invention can be carried out at a lower temperature than the conventional forging temperature, which is conducive to reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a front cross-sectional schematic diagram of the present invention;

[0019] Figure 2 yes Figure 1 Schematic cross-sectional view of AA in the figure;

[0020] Figure 3 yes Figure 1 A schematic cross-sectional view of the middle BB;

[0021] Figure 4 yes Figure 1 A magnified schematic diagram of part C;

[0022] Figure 5 is a schematic diagram of the support plate;

[0023] Figure numerals: 1—base; 2—lower hydraulic cylinder; 3—support plate; 4—positioning column; 5—mold base; 6—feeding hole; 7—lower forming section; 8—upper forming section; 9—lower forming cavity; 10—upper forming cavity; 11—first forming tooth; 12—first driving mechanism; 13—second forming tooth; 14—pressure head; 15—pressure mechanism; 16—guide blind hole; 17—second driving mechanism; 18—preheating mechanism; 19—first sealing slope; 20—sealing cylinder; 21—guide rail; 22—first slide; 23—third driving mechanism; 24—second slide; 25—fourth driving mechanism; 26—ejection hydraulic cylinder; 27—ejection block; 28—sealing pad; 29—heating assembly; 30—sealing ring; 31—atomizing nozzle; 32—release agent storage container; 33—driving pump; 34—spring. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] The gear high temperature extrusion forming device of the present invention is as follows: Figures 1 to 5 As shown, it includes a base 1, which is made of a thick metal plate and can be fixed on the floor of the workshop to ensure the stability of the base 1 and to stably bear the load. A rotatable lower hydraulic cylinder 2 is vertically arranged on the base 1, and the lower hydraulic cylinder 2 is connected to a second driving mechanism 17 that drives the lower hydraulic cylinder 2 to rotate. The second driving mechanism 17 can be a stepping motor or other equipment, which is used to drive the lower hydraulic cylinder 2 to rotate a set angle. A support plate 3 is arranged at the top of the lower hydraulic cylinder 2, and a positioning column 4 is arranged at the center of the upper surface of the support plate 3. The support plate 3 is used to support the gear blank, and the positioning column 4 is used to position the gear blank. The side wall of the positioning column 4 is provided with an axially extending transmission convex strip, and a transmission groove can be machined in the inner hole of the gear blank. When extruding, the gear blank is sleeved on the positioning column 4, and the transmission convex strip enters the transmission groove. When the lower hydraulic cylinder 2 rotates, it can drive the gear blank to rotate synchronously.

[0026] A die base 5 is arranged above the support plate 3. The die base 5 is supported by a plurality of vertical support columns. The lower ends of the support columns are fixed on the base 1. A feed hole 6 is arranged on the die base 5. A mold core is arranged on the upper surface of the die base 5. The mold core includes a lower forming section 7 and an upper forming section 8. The feed hole 6 is used for the gear blank to enter the lower forming section 7 and the upper forming section 8 above. A lower forming cavity 9 is arranged inside the lower forming section 7. The lower forming cavity 9 is a circular cavity. Its diameter is adapted to the outer diameter of the gear blank to ensure that after the gear blank enters the lower forming cavity 9, the outer wall of the gear blank and the inner wall of the lower forming cavity 9 have a reduced gap. A notch is arranged on the side wall of the lower forming cavity 9 vertically penetrating the lower forming section 7. A first forming tooth 11 is arranged in the notch. The first forming tooth 11 is connected to a first driving mechanism 12 that drives the first forming tooth 11 to move radially along the lower forming cavity 9. The first forming tooth 11 is used to form a plurality of prefabricated tooth grooves on the outer wall of the gear blank. The first driving mechanism 12 can be a hydraulic cylinder or other equipment. When the first driving mechanism 12 drives the first forming tooth 11 to radially enter the lower forming cavity 9, the lower forming cavity 9 can radially extrude the gear blank to form a prefabricated tooth groove on the side wall of the gear blank. After each extrusion of the first forming tooth 11, the second driving mechanism 17 drives the lower hydraulic cylinder 2, the support plate 3 and the gear blank to rotate a set angle, and then the first forming tooth 11 is extruded again to form a plurality of evenly distributed prefabricated tooth grooves on the outer wall of the gear blank, and the number of the prefabricated tooth grooves is the same as the number of the gear tooth grooves.

[0027] An upper forming cavity 10 is provided inside the upper forming section 8, the inner diameter of the upper forming cavity 10 is larger than the inner diameter of the lower forming cavity 9, and a plurality of second forming teeth 13 are provided on the side wall of the upper forming cavity 10, the size of the second forming teeth 13 is the same as the design size of the gear tooth groove, the number of the second forming teeth 13 is the same as the number of the prefabricated tooth grooves, and the size of the second forming teeth 13 is smaller than the size of the prefabricated tooth grooves; a pressing head 14 is provided above the mold core, the outer diameter of the pressing head 14 is adapted to the inner diameter of the upper forming cavity 10, and it is ensured that after the pressing head 14 enters the upper forming cavity 10, the inner wall of the upper forming cavity 10 is fitted with the outer wall of the pressing head 14. The pressing head 14 is connected to a pressure mechanism 15, and the pressure mechanism 15 is used to provide extrusion force, and an existing press machine and other equipment can be used. A guide blind hole 16 is provided on the lower surface of the pressing head 14, and the diameter of the guide blind hole 16 is adapted to the diameter of the positioning column 4. In the process of downward extrusion of the pressing head 14, the positioning column 4 can extend into the guide blind hole 16. The outer wall of the ram 14 is provided with a plurality of guide grooves corresponding to the second forming teeth 13. After the ram 14 enters the upper forming cavity 10, the second forming teeth 13 can enter the guide grooves. The guide blind hole 16, the upper forming cavity 10, the lower forming cavity 9, the feed through hole 6 and the positioning column 4 are coaxial.

[0028] The process of machining a gear using the present invention includes: first preparing a gear blank, which is a circular blank, punching a center hole, machining a transmission groove in the center hole, and matching the outer diameter of the gear blank with the inner diameter of the lower forming cavity 9. After the gear blank is prepared, it is heated to 500 to 600 degrees Celsius, and then placed on the support plate 3, the positioning column 4 passes through the center and west holes of the gear blank, and the transmission convex strip on the positioning column 4 extends into the transmission groove.

[0029] The lower hydraulic cylinder 2 pushes the support plate 3 and the gear blank upward into the lower forming cavity 9, and the first driving mechanism 12 pushes the first forming tooth 11 to move a suitable distance toward the inside of the lower forming cavity 9, and the first forming tooth 11 radially extrude the gear blank to form a prefabricated tooth groove on the surface of the gear blank. After each extrusion, the first forming tooth 11 is reset, and the second driving mechanism 17 drives the lower hydraulic cylinder 2, the support plate 3 and the gear blank to rotate a set angle, and then the first forming tooth 11 is extruded again to form a plurality of evenly distributed prefabricated tooth grooves on the outer wall of the gear blank, and the number of prefabricated tooth grooves is the same as the number of gear tooth grooves.

[0030] Next, the lower hydraulic cylinder 2 pushes the support plate 3 and the gear blank upward into the upper forming cavity 10, and then uses the pressure mechanism 15 to push the ram 14 downward into the upper forming cavity 10. After the ram 14 contacts the gear blank, it squeezes the gear blank, making the gear blank thicker. At the same time, the material of the gear blank flows radially outward, fits with the second forming teeth 13, and fills the space between two adjacent second forming teeth 13. After the gear forming is completed, the ram 14 is reset upward, the support plate 3 is reset downward, and the formed gear is taken out of the mold core.

[0031] In the present invention, the material deformation of each part of the gear blank is relatively uniform, and there is no excessive local deformation, thereby reducing the risk of crack generation, improving the product qualification rate, and allowing hot extrusion at a lower temperature, which is beneficial to reducing energy consumption.

[0032] In order to keep the gear blank at a set temperature during the extrusion process, a preheating mechanism 18 surrounding the feed through hole 6 is provided in the die base 5. Before extrusion forming, the preheating mechanism 18 can preheat the die base 5 and the mold core to increase the temperature, reduce the temperature difference between the gear blank and the mold, and thus reduce the cooling rate of the gear blank. During the extrusion forming process, the preheating mechanism 18 continues to heat, which can further reduce the cooling rate of the gear blank. At the same time, heating elements can also be provided inside the lower forming section 7 and the upper forming section 8. The preheating mechanism 18 can specifically adopt an electric heating wire.

[0033] Due to the size error of the gear blank, there is a matching clearance between the gear blank and the positioning column 4. In order to ensure that the gear blank quickly passes through the feed hole 6 and enters the lower forming section 7, the feed hole 6 is set to be a truncated cone, and the diameter of the upper port of the feed hole 6 is smaller than the diameter of the lower port, and the diameter of the upper port of the feed hole 6 is the same as the diameter of the lower forming cavity 9. The lower port of the feed hole 6 is larger than the outer diameter of the gear blank, so that the gear blank can directly enter the feed hole 6 and enter the lower forming cavity 9 along the feed hole 6.

[0034] At present, a dedicated heating furnace is used to heat the gear blank, and the gear blank is transferred to the support plate 3 after heating. There is a certain distance between the heating furnace and the extrusion forming device. During the transfer of the gear blank, heat is dissipated, which increases heat loss and has certain safety risks, which is not conducive to improving production efficiency. In the present invention, a horizontal guide rail 21 is arranged on the base 1, and a first slide 22 and a second slide 24 that slide with the guide rail 21 are arranged on the guide rail 21. The first slide 22 and the second slide 24 are respectively connected to a third drive mechanism 23 and a fourth drive mechanism 25. The lower hydraulic cylinder 2 and the second drive mechanism 17 are arranged on the first slide 22, and a vertical ejection hydraulic cylinder 26 is arranged on the second slide 24. The upper end of the ejection hydraulic cylinder 26 is provided with an ejection block 27, and the outer diameter of the ejection block 27 is smaller than the diameter of the lower forming cavity 9; a heating component 29 is arranged on the side of the mold base 5 away from the ejection block 27. The heating component 29 can use an electric heating element, preferably an electromagnetic induction heating mechanism, which has high heating efficiency. The third drive mechanism 23 and the fourth drive mechanism 25 use hydraulic cylinders.

[0035] During operation, the third driving mechanism 23 is used to drive the first slide 22 to move to the end of the guide rail 21, and the lower hydraulic cylinder 2, the support plate 3, etc. are moved to the end of the guide rail 21, and then the gear blank at room temperature is placed on the support plate 3, and then the third driving mechanism 23 is used to drive the first slide 22 to move to the bottom of the heating component 29. At this time, the gear blank is located at the heating component 29, and the heating component 29 is used to heat the gear blank. After the heating is completed, the third driving mechanism 23 is used to drive the first slide 22 to move to the bottom of the die base 5. At this time, the die base 5 is located below the feed through hole 6, and finally the lower hydraulic cylinder 2 is used to push the gear blank into the die core and complete the extrusion. After extrusion forming, the lower hydraulic cylinder 2 drives the support plate 3 to reset downward, and the third driving mechanism 23 drives the first slide 22 to move, so that the first slide 22 is moved away from under the die base 5, and then the fourth driving mechanism 25 drives the second slide 24 to move to under the die base 5. At this time, the ejection block 27 is located below the feed through hole 6, and the ejection hydraulic cylinder 26 drives the ejection block 27 to move upward. After the ejection block 27 enters the upper forming cavity 10, it ejects the gear to complete the demolding.

[0036] The present invention arranges the extrusion forming die and the heating assembly 29 on the same base 1, and the distance between the two is very close. After the gear blank is heated to the set temperature, it can be quickly transferred to the die for extrusion, which saves the transfer time and improves the production efficiency. In addition, by arranging the ejection hydraulic cylinder 26 and the ejection block 27, the formed gear can be ejected to complete demoulding.

[0037] One of the difficulties of extrusion molding is that after molding, the outer wall of the part is closely attached to the inner wall of the molding cavity, which makes demoulding difficult. In order to reduce the difficulty of demoulding, the present invention is provided with a first sealing bevel 19 at the upper port of the upper molding cavity 10, and a sealing cylinder 20 that slides and seals with the pressing head 14 is provided on the outer wall of the pressing head 14. The lower surface of the sealing cylinder 20 is provided with a second sealing bevel, which is parallel to the first sealing bevel 19. A sealing gasket 28 is provided on the second sealing bevel, and the lower surface of the sealing gasket 28 is also an inclined surface that can fit with the first sealing bevel 19. A spring 34 is provided on the upper surface of the sealing cylinder 20, and a support ring plate is provided on the upper end side wall of the pressing head 14. The upper end of the spring 34 is fixedly connected to the support ring plate, and the lower end is fixedly connected to the sealing cylinder 20. The outer wall of the support plate 3 is provided with an annular sealing groove, and a sealing ring 30 is provided in the sealing groove.

[0038] When the support plate 3 enters the lower forming cavity 9, the sealing ring 30 is deformed to seal the outer wall of the support plate 3 and the side wall of the lower forming cavity 9, and the air in the upper forming cavity 10 cannot be discharged from the lower forming cavity 9. In the initial position, the lower surface of the sealing gasket 28 is lower than the lower surface of the pressure head 14. When the pressure head 14 moves downward, the sealing gasket 28 first contacts the first sealing inclined surface 19. As the pressure head 14 continues to move downward, the spring 34 is compressed, and the sealing gasket 28 gradually presses the first sealing inclined surface 19 to seal the upper port of the upper forming cavity 10. At this time, since the outer diameter of the gear blank is smaller than the inner diameter of the upper forming cavity 10, there is a gap between the outer wall of the gear blank and the inner wall of the upper forming cavity 10, and there is air in the gap. Since the upper forming cavity 10 is in a sealed state, the air will also be squeezed when the pressure head 14 continues to squeeze the gear blank downward, thereby forming an air film between the gear blank and the inner wall of the upper forming cavity 10, which can effectively prevent the formed gear from adhering to the inner wall of the upper forming cavity 10 and reduce the difficulty of subsequent demolding.

[0039] In order to further prevent the formed gear from adhering to the inner wall of the upper forming cavity 10, the outer diameter of the ejector block 27 is smaller than the inner diameter of the upper forming cavity 10, and the outer wall of the ejector block 27 is provided with a circular mounting groove, and a plurality of atomizing nozzles 31 are provided in the mounting groove, and the atomizing nozzles 31 are connected to a hose, and the hose is connected to a demoulding agent storage container 32, and a driving pump 33 is provided on the hose. The demoulding agent storage container 32 stores liquid demoulding agent, and the demoulding agent can be made by the existing technology. Before extrusion, the ejector block 27 is driven to extend into the upper forming cavity 10, and the driving pump 33 is started. The driving pump 33 transports the demoulding agent in the demoulding agent storage container 32 to each atomizing nozzle 31 and sprays it onto the side wall of the upper forming cavity 10, completing the spraying of the demoulding agent. Under the joint action of the demoulding agent and the air film, the gear demoulding is easy and rapid demoulding can be achieved.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Gear high temperature extrusion forming device, characterized by: The invention comprises a base (1), a rotatable lower hydraulic cylinder (2) is vertically arranged on the base (1), the lower hydraulic cylinder (2) is connected to a second driving mechanism (17) for driving the lower hydraulic cylinder (2) to rotate, a support plate (3) is arranged at the top end of the lower hydraulic cylinder (2), a positioning column (4) is arranged at the center of the upper surface of the support plate (3); a die base (5) is arranged above the support plate (3), a feed through hole (6) is arranged on the die base (5), a die core is arranged on the upper surface of the die base (5), the die core comprises a lower forming section (7) and an upper forming section (8), a lower forming cavity (9) is arranged inside the lower forming section (7), a notch vertically penetrating the lower forming section (7) is arranged on the side wall of the lower forming cavity (9), a first forming tooth (11) is arranged in the notch, the first forming tooth (11) is connected to a second forming tooth (11) for driving the first forming tooth (11) to move radially along the lower forming cavity (9). A driving mechanism (12), wherein the first forming teeth (11) are used to form a plurality of prefabricated tooth grooves on the outer wall of the gear blank; an upper forming cavity (10) is provided inside the upper forming section (8), the inner diameter of the upper forming cavity (10) is larger than the inner diameter of the lower forming cavity (9), a plurality of second forming teeth (13) are provided on the side wall of the upper forming cavity (10), the number of the second forming teeth (13) is the same as the number of the prefabricated tooth grooves, and the size of the second forming teeth (13) is smaller than the size of the prefabricated tooth grooves; a pressing head (14) is provided above the mold core, the pressing head (14) is connected to a pressure mechanism (15), a plurality of guide grooves corresponding to the second forming teeth (13) are provided on the outer wall of the pressing head (14), a guide blind hole (16) is provided on the lower surface of the pressing head (14), and the guide blind hole (16), the upper forming cavity (10), the lower forming cavity (9), the feed through hole (6) and the positioning column (4) are coaxial; The upper port of the upper forming cavity (10) is provided with a first sealing bevel (19), the outer side wall of the pressing head (14) is provided with a sealing cylinder (20) which slides and seals with the pressing head (14), the lower surface of the sealing cylinder (20) is provided with a second sealing bevel, a sealing gasket (28) is provided on the second sealing bevel, and a spring (34) is provided on the upper surface of the sealing cylinder (20); the outer wall of the supporting plate (3) is provided with an annular sealing groove, and a sealing ring (30) is provided in the sealing groove.

2. The high temperature extrusion forming device for gears according to claim 1, characterized in that: A preheating mechanism (18) surrounding the feed through hole (6) is arranged in the mold base (5).

3. The high temperature extrusion forming device for gears according to claim 1, characterized in that: The feed through hole (6) is in a truncated cone shape, and the diameter of the upper end of the feed through hole (6) is smaller than the diameter of the lower end, and the diameter of the upper end of the feed through hole (6) is the same as the diameter of the lower forming cavity (9).

4. The high temperature extrusion forming device for gears according to claim 1, characterized in that: The base (1) is provided with a horizontal guide rail (21), the guide rail (21) is provided with a first slide seat (22) and a second slide seat (24) which are slidably matched with the guide rail (21), the first slide seat (22) and the second slide seat (24) are respectively connected to a third drive mechanism (23) and a fourth drive mechanism (25), the lower hydraulic cylinder (2) and the second drive mechanism (17) are arranged on the first slide seat (22), the second slide seat (24) is provided with a vertical ejection hydraulic cylinder (26), and an ejection block (27) is arranged at the upper end of the ejection hydraulic cylinder (26); a heating component (29) is arranged on a side of the mold base (5) away from the ejection block (27).

5. The high temperature extrusion forming device for gears according to claim 4, characterized in that: The outer diameter of the ejector block (27) is smaller than the inner diameter of the upper forming cavity (10); the outer wall of the ejector block (27) is provided with a circular mounting groove; a plurality of atomizing nozzles (31) are provided in the mounting groove; the atomizing nozzles (31) are connected to a hose; the hose is connected to a release agent storage container (32); and a driving pump (33) is provided on the hose.

6. The high temperature extrusion forming device for gears according to claim 4, characterized in that: The heating component (29) is an electromagnetic induction heating mechanism.

7. The high temperature extrusion forming device for gears according to claim 1, characterized in that: The first driving mechanism (12) is a hydraulic cylinder.

8. The high temperature extrusion forming device for gears according to claim 4, characterized in that: The third drive mechanism (23) and the fourth drive mechanism (25) are hydraulic cylinders.

9. The high temperature extrusion forming device for gears according to claim 1, characterized in that: The second driving mechanism (17) is a stepping motor.

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