High-temperature alloy hot extrusion pre-forging die

Abstract

The invention belongs to the technical field of dies, and particularly discloses a high-temperature alloy hot extrusion pre-forging die which comprises a workbench, an upper die, a lower die plate, a female die, a movable lower die, a lower die core, a heating system and an ejection system. The lower template is fixed on the workbench; the female die is located above the lower die plate, and a first cavity used for installing the movable lower die is formed in the center of the female die. A second cavity for mounting the lower mold core is formed in the center of the movable lower mold; the heating system is located outside the female die and used for heating the female die. A first vent hole is formed in the female die, a second vent hole is formed in the movable lower die, the first vent hole is communicated with the first cavity, and the second vent hole is communicated with the first cavity and the forming cavity; inert gas, cooling gas and high-temperature gas can be introduced into the first cavity and the forming cavity through the first vent holes. According to the die, oxide skin can be prevented from being generated in the workpiece pressing process, the die can be rapidly cooled when disassembled, and the die can be rapidly heated when preheated.

Description

Technical Field

[0001] The invention belongs to the technical field of dies, and in particular relates to a high-temperature alloy hot extrusion pre-forging die. Background Art

[0002] Oil-powered UAVs have been widely used in the field of military aviation due to their strong wind resistance, large load and continuous working ability. As important parts of oil-powered UAVs, high-temperature alloy forgings have excellent mechanical properties, heat resistance and corrosion resistance. Their forming dies and forging processes have always been the research focus of the forging industry.

[0003] During the pre-forging process of high-temperature alloy parts, closed die forging technology is usually required. In addition, the hot forging speed of high-temperature alloys is slow, and scale is easily generated, which affects the quality of the formed workpiece. During the demolding process of high-temperature alloy molds, multi-stage ejection is sometimes required, usually with multi-cylinder ejection, which is costly and has limited layout space. In addition, the mold is prone to jamming after ejection. Due to the wide variety of high-temperature alloy parts in oil-powered drones, products are usually produced in small batches. Pre-forging molds need to be replaced frequently, and after replacing the mold, it takes more than 20 hours of preheating, and the efficiency of mold replacement is very low. Summary of the invention

[0004] The object of the present invention is to provide a high-temperature alloy hot extrusion pre-forging die, which can prevent the generation of oxide scale during the pressing process of the workpiece, and can quickly cool the die when disassembling the die, and can quickly heat the die when preheating the die.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a high-temperature alloy hot extrusion pre-forging die, comprising a workbench, an upper die, a lower die plate, a concave die, a movable lower die, a lower die core, a heating system and an ejection system; the lower die plate is fixed on the workbench; the concave die is located above the lower die plate, and a first cavity for installing the movable lower die is provided at the center of the concave die; a second cavity for installing the lower die core is provided at the center of the movable lower die; the upper die is located above the movable lower die and the lower die core, and the lower side of the upper die, the upper side and the inner side of the movable lower die, the upper side of the lower die core and the inner side of the concave die constitute a molding cavity; the ejection system is used to eject the workpiece in the molding cavity, and the heating system is located outside the concave die and is used to heat the concave die; a first vent hole is provided in the concave die, and a second vent hole is provided in the movable lower die, the first vent hole is connected to the first cavity, and the second vent hole is connected to the first cavity and the molding cavity; inert gas, cooling gas and high-temperature gas can be introduced into the first cavity and the molding cavity through the first vent hole.

[0006] Furthermore, the heating system includes a heating component and a heat-insulating layer, and the heat-insulating layer is used to wrap the outside of the heating component.

[0007] Furthermore, a mounting groove is provided on the top of the lower template, and a heat insulation pad is provided in the mounting groove.

[0008] Furthermore, a vertical mounting through hole is provided on the thermal insulation pad, a support column is provided in the mounting through hole, the lower side of the support column abuts against the mounting groove, and the upper side of the support column abuts against the bottom of the movable lower mold and / or the bottom of the lower mold core.

[0009] Further, the second cavity includes a first cavity, a second cavity and a third cavity, the first cavity and the third cavity are cylindrical cavities and the diameter of the first cavity is larger than that of the third cavity, the second cavity is a conical cavity, the large diameter end of the second cavity is connected to the first cavity and the small diameter end is connected to the third cavity; the lower mold core includes a first core segment, a second core segment and a third core segment, the first core segment and the third core segment are cylindrical segments and the diameter of the first core segment is larger than the diameter of the third core segment; the second core segment is a conical segment, the large diameter end of the second core segment is connected to the first core segment and the small diameter end is connected to the third core segment; the diameter of the first core segment matches the diameter of the first cavity and the height of the first core segment is smaller than the height of the first cavity; the diameter of the third core segment is smaller than the diameter of the third cavity; the second core segment and the second cavity have the same conical slope and the height of the second core segment is higher than the second cavity.

[0010] Furthermore, the ejection system includes an ejection cylinder, a center cylinder, an ejector rod and a center rod. The output end of the ejection cylinder can drive the center cylinder to reciprocate and can abut against the bottom of the ejector rod to eject the ejector rod. The workbench and the lower template are respectively provided with a first ejection hole and a second ejection hole for passing the ejector rod; the upper and lower sides of the second ejection hole are respectively connected with the bottom of the first cavity and the top of the first ejection hole, and the upper end of the ejector rod is provided with a limit head, which is located above the lower template and cannot pass through the second ejection hole; the workbench and the center of the lower template are respectively provided with a third ejection hole and a fourth ejection hole for passing the center rod, and the upper and lower sides of the fourth ejection hole are respectively connected with the bottom of the second cavity and the top of the third ejection hole; the upper side of the center rod is connected to the bottom of the lower mold core, and the lower side of the center rod is connected to the output end of the center cylinder.

[0011] Furthermore, T-slots are provided at the top of the output end of the central cylinder and the bottom of the lower mold core, and the small ends of the two groups of T-slots are located on the side close to each other; T-connecting blocks matching the two groups of T-slots are provided at both ends of the central rod, and the T-connecting blocks are laterally slidably connected to the T-slots.

[0012] Furthermore, a bushing is provided in the fourth ejection hole; the T-shaped connecting block can pass through the fourth ejection hole; and the center rod is located in the bushing.

[0013] Furthermore, displacement sensors are provided on the output end of the top cylinder and the output end of the center rod.

[0014] Further, the movable lower mold includes a first lower mold segment, a second lower mold segment and a third lower mold segment, the first lower mold segment and the third lower mold segment are both cylindrical segments and the diameter of the first lower mold segment is smaller than the diameter of the third lower mold segment, the second lower mold segment is a conical segment, the large diameter end of the second lower mold segment is connected to the third lower mold segment and the small diameter end is connected to the first lower mold segment; the first cavity includes a fourth cavity, a fifth cavity and a sixth cavity, the fourth cavity and the sixth cavity are both cylindrical cavities and the diameter of the sixth cavity is larger than the diameter of the fourth cavity; the fifth cavity is a conical cavity, the large diameter end of the fifth cavity is connected to the sixth cavity and the small diameter end is connected to the fourth cavity; the cone slope of the fifth cavity is the same as that of the second lower mold segment; the diameter of the fourth cavity matches the diameter of the first lower mold segment and the height of the first lower mold segment is higher than the height of the fourth cavity; the diameter of the sixth cavity matches the diameter of the third lower mold segment and the height of the third lower mold segment is smaller than the height of the sixth cavity.

[0015] The working principle of this technical solution is:

[0016] Turn on the heating component and fill the first vent with high-temperature gas. After heating for a period of time, put the blank into the molding cavity, and the hydraulic system drives the upper mold to move downward for pressing. At the same time, during the pressing process, inert gas is filled into the first vent. After the pressing is completed, the upper mold moves upward to its original position. Start the top cylinder first, and the output end of the top cylinder drives the top rod and the center cylinder to move upward. The top rod and the center rod synchronously drive the movable lower mold and the lower mold core to move upward, and the workpiece is ejected upward. When the output end of the top cylinder moves to the set position, the top cylinder stops moving, the center cylinder drives the center rod to move upward, and the center rod drives the lower mold core to move upward to eject the workpiece.

[0017] During reset, if mold jam occurs, first return the ejector cylinder to its original position. Then pressurize the center cylinder to return, the output end of the center cylinder drives the center rod to move downward, the center rod drives the lower mold core to move downward, the second core segment of the lower mold core presses down the second cavity, so that the movable lower mold moves downward, the movable lower mold pushes the ejector rod downward, until all parts return to their original positions, thereby eliminating the mold jam.

[0018] When changing the mold, fill the first vent with cooling gas to cool the mold quickly. After cooling, slide the entire mold out of the T-slot on the center cylinder by moving the workbench to release the connection between the center rod and the center cylinder. After changing the mold, slide the T-connecting block on the lower side of the center rod into the T-slot on the center cylinder until the T-connecting block abuts against the closed side of the T-slot, thereby connecting the center rod and the center cylinder, thereby achieving the effect of rapid mold change.

[0019] When disassembling the center rod and the lower mold core, lift the center rod upward so that the T-shaped connecting block on the lower side of the center rod pushes the bushing out of the fourth ejection hole, and the T-shaped connecting block passes through the fourth ejection hole, so that the lower mold core can be ejected from the movable lower mold, and then the T-shaped connecting block on the upper side of the center rod can be slid out of the T-slot of the lower mold core.

[0020] The beneficial effects of this technical solution are:

[0021] 1. In this technical solution, support columns are arranged inside the thermal insulation pad to enhance the pressure-bearing capacity of the thermal insulation pad, thereby solving the problem of the thermal insulation material being compressed, deformed or even broken under large-tonnage working conditions.

[0022] 2. During the workpiece pressing process, inert gas is introduced into the mold cavity to reduce the generation of workpiece oxide scale.

[0023] 3. When disassembling the mold, pass cooling gas into the mold to achieve rapid cooling of the mold. When preheating the mold, pass high-temperature gas to quickly heat the mold and improve the disassembly and preheating efficiency.

[0024] 4. The cylinder-in-cylinder structure is adopted to achieve multi-stage ejection and demoulding, reducing costs.

[0025] 5. Connect the mold with the top cylinder and the center cylinder. The lower mold core can be pressed down to move the lower mold through the wedge surface structure, solving the problem of mold jamming.

[0026] 6. When changing molds, a T-shaped connecting block is used to quickly connect and disconnect the mold and the center cylinder to improve mold changing efficiency.

[0027] 7. Integrate the heating component and the thermal insulation layer into a heating system. The heating system has the functions of heating internal parts and isolating the influence of external temperature. The thermal insulation layer can prevent the external environment from interfering with the mold temperature and reduce energy dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of a high-temperature alloy hot extrusion pre-forging die during pressing of the present invention;

[0029] Figure 2 It is a structural schematic diagram of a high-temperature alloy hot extrusion pre-forging die during demoulding of the present invention;

[0030] Figure 3 for Figure 1 Top view of the middle insulation pad. DETAILED DESCRIPTION

[0031] The following is further described in detail through specific implementation methods:

[0032] The figure marks in the drawings of the specification include: workbench 1, lower mold plate 2, heating system 3, die 4, movable lower mold 5, upper mold 6, workpiece 7, lower mold core 8, thermal insulation pad 9, bushing 10, top cylinder 11, center cylinder 12, top rod 13, center rod 14, T-shaped connecting block 15, first air vent 16, second air vent 17, displacement sensor 18, support column 19.

[0033] 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.

[0034] The embodiment is basically as shown in the attached Figure 1-3 As shown: A high-temperature alloy hot extrusion pre-forging die, including a workbench 1, an upper die 6, a lower die plate 2, a concave die 4, a movable lower die 5, a lower die core 8, a heating system 3 and an ejection system. The lower die plate 2 is fixed on the workbench 1, and the workbench 1 is detachably mounted on the base by screws. The base supports the workbench 1, and the ejection system can be arranged inside the base, and a through hole for passing the ejection system is provided in the base.

[0035] The concave die 4 is located above the lower die plate 2, and a first cavity for mounting a movable lower die 5 is provided at the center of the concave die 4; a second cavity for mounting a lower die core 8 is provided at the center of the movable lower die 5. The upper die 6 is located above the movable lower die 5 and the lower die core 8, and the lower side of the upper die 6, the upper side and the interior of the movable lower die 5, the upper side of the lower die core 8 and the inner side of the concave die 4 constitute a molding cavity for molding a workpiece 7, and an ejection system is used to eject the workpiece 7 in the molding cavity.

[0036] The heating system 3 is located outside the die 4 and is used to heat the die 4. The heating system 3 includes a heating component and a heat insulation layer. The heating component can be an electric heating plate, and the heat insulation layer is used to wrap the outside of the heating component. A first vent hole 16 is provided in the die 4, and a second vent hole 17 is provided in the movable lower die 5. The first vent hole 16 is connected to the first cavity, and the second vent hole 17 is connected to the first cavity and the molding cavity. Inert gas, cooling gas and high-temperature gas can be introduced into the first cavity and the molding cavity through the first vent hole 16.

[0037] A mounting groove is provided on the top of the lower template 2, and a heat insulation pad 9 is provided in the mounting groove. Figure 3As shown, the thermal insulation pad 9 is provided with a plurality of groups of vertical mounting holes, and support columns 19 are provided in the mounting holes. The lower sides of the support columns 19 are abutted against the mounting grooves, and the upper sides of the support columns 19 are abutted against the bottom of the movable lower mold 5 and / or the bottom of the lower mold core 8. In this embodiment, 8 groups of support columns 19 are evenly provided under the movable lower mold 5, and 8 groups of support columns 19 are provided under the lower mold core 8.

[0038] The second cavity includes a first cavity, a second cavity and a third cavity. The first cavity and the third cavity are cylindrical cavities and the diameter of the first cavity is larger than that of the third cavity. The second cavity is a conical cavity. The large diameter end of the second cavity is connected to the first cavity and the small diameter end is connected to the third cavity. The lower mold core 8 includes a first core segment, a second core segment and a third core segment. The first core segment and the third core segment are cylindrical segments and the diameter of the first core segment is larger than that of the third core segment. The second core segment is a conical segment. The large diameter end of the second core segment is connected to the first core segment and the small diameter end is connected to the third core segment. The diameter of the first core segment matches the diameter of the first cavity and the height of the first core segment is smaller than the height of the first cavity. The diameter of the third core segment is smaller than the diameter of the third cavity. The second core segment and the second cavity have the same conical slope and the height of the second core segment is higher than that of the second cavity.

[0039] The ejection system includes an ejection cylinder 11, a center cylinder 12, an ejector rod 13 and a center rod 14. The output end of the ejection cylinder 11 can drive the center cylinder 12 to reciprocate and can abut against the bottom of the ejector rod 13 to eject the ejector rod 13. In this embodiment, an ejection plate is connected to the cylinder body of the center cylinder 12 for ejecting the ejector rod 13. The workbench 1, the lower template 2 and the thermal insulation pad 9 are respectively provided with a first ejection hole, a second ejection hole and a fifth ejection hole for passing the ejector rod 13; the upper and lower sides of the second ejection hole are respectively connected to the fifth ejection hole and the top of the first ejection hole, and the fifth ejection hole is connected to the first cavity. A limit head is provided at the upper end of the ejector rod 13, and the limit head is located above the lower template 2 and cannot pass through the second ejection hole. The workbench 1, the lower mold plate 2 and the thermal insulation pad 9 are respectively provided with a third ejection hole, a fourth ejection hole and a sixth ejection hole for passing the center rod 14. The upper and lower sides of the fourth ejection hole are respectively connected to the top of the sixth ejection hole and the third ejection hole, and the sixth ejection hole is connected to the bottom of the second cavity. The upper side of the center rod 14 is connected to the bottom of the lower mold core 8, and the lower side of the center rod 14 is connected to the output end of the center cylinder 12. T-slots are provided at the top of the output end of the center cylinder 12 and the bottom of the lower mold core 8, and the small ends of the two groups of T-slots are located on the side close to each other. T-shaped connecting blocks 15 matching the two groups of T-slots are provided at both ends of the center rod 14, and the T-shaped connecting blocks 15 are connected to the T-slots in a transverse sliding manner. The sixth ejection hole and the fourth ejection hole are provided with bushings 10, the large diameter end of the bushing 10 is located in the sixth ejection hole, and the small diameter end is located in the fourth ejection hole; the T-shaped connecting block 15 can pass through the fourth ejection hole and the sixth ejection hole; the center rod 14 is located in the bushing 10. In this embodiment, the bushing 10 is vertically divided into two halves to facilitate the installation of the center rod 14.

[0040] The T-slot can be set as a structure with one side closed and the other side open. When the T-connecting block 15 slides into the T-slot and abuts against the closed side, a blocking block can be installed in the T-slot. The blocking block is fixed to the outer side of the T-slot with screws, so that the T-connecting block 15 is fixed in the T-slot.

[0041] The movable lower mold 5 includes a first lower mold section, a second lower mold section and a third lower mold section. The first lower mold section and the third lower mold section are both cylindrical sections and the diameter of the first lower mold section is smaller than the diameter of the third lower mold section. The second lower mold section is a conical section. The large diameter end of the second lower mold section is connected to the third lower mold section and the small diameter end is connected to the first lower mold section. The first cavity includes a fourth cavity, a fifth cavity and a sixth cavity. The fourth cavity and the sixth cavity are both cylindrical cavities and the diameter of the sixth cavity is larger than the diameter of the fourth cavity. The fifth cavity is a conical cavity. The large diameter end of the fifth cavity is connected to the sixth cavity and the small diameter end is connected to the fourth cavity. The conical slope of the fifth cavity is the same as that of the second lower mold section. The diameter of the fourth cavity matches the diameter of the first lower mold section and the height of the first lower mold section is higher than the height of the fourth cavity. The diameter of the sixth cavity matches the diameter of the third lower mold section and the height of the third lower mold section is smaller than that of the sixth cavity.

[0042] Displacement sensors 18 are provided on the output ends of the top cylinder 11 and the center rod 14 .

[0043] The specific implementation process is as follows:

[0044] Turn on the heating component and fill the first vent hole 16 with high-temperature gas. After heating for a period of time, put the blank into the molding cavity, and the hydraulic system drives the upper mold 6 to move downward for molding. At the same time, during the molding process, inert gas is filled into the first vent hole 16. After the molding is completed, the upper mold 6 moves upward to its original position. First, start the top cylinder 11. The output end of the top cylinder 11 drives the top rod 13 and the center cylinder 12 to move upward. The top rod 13 and the center rod 14 synchronously drive the movable lower mold 5 and the lower mold core 8 to move upward, and the workpiece 7 is ejected upward. When the output end of the top cylinder 11 moves to the set position, the top cylinder 11 stops moving, the center cylinder 12 drives the center rod 14 to move upward, and the center rod 14 drives the lower mold core 8 to move upward to eject the workpiece 7.

[0045] During reset, if mold jamming occurs, the ejector cylinder 11 can be returned to its original position first. Then the center cylinder 12 is pressurized and returned, the output end of the center cylinder 12 drives the center rod 14 to move downward, the center rod 14 drives the lower mold core 8 to move downward, the second core segment of the lower mold core 8 presses down the second cavity of the movable lower mold 5, so that the movable lower mold 5 moves downward, and the movable lower mold 5 pushes the ejector rod 13 downward until all components return to their original positions, thereby eliminating the mold jamming phenomenon.

[0046] When changing the mold, the cooling gas is filled into the first vent hole 16 to quickly cool down the mold. After cooling down, the entire mold is slid out of the T-slot on the center cylinder 12 by moving the workbench 1 to release the connection between the center rod 14 and the center cylinder 12. After changing the mold, the T-shaped connecting block 15 on the lower side of the center rod 14 is slid into the T-slot on the center cylinder 12 until the T-shaped connecting block 15 abuts against the closed side of the T-slot, thereby realizing the connection between the center rod 14 and the center cylinder 12, thereby achieving the effect of rapid mold change.

[0047] When disassembling the center rod 14 and the lower mold core 8, the center rod 14 is lifted upward so that the T-shaped connecting block 15 on the lower side of the center rod 14 pushes the bushing 10 out of the fourth ejection hole, and the T-shaped connecting block 15 passes through the fourth ejection hole, thereby being able to eject the lower mold core 8 from the movable lower mold 5, and then the T-shaped connecting block 15 on the upper side of the center rod 14 can be slid out of the T-slot of the lower mold core 8.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0049] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A high temperature alloy hot extrusion pre-forging die, characterized in that: The invention comprises a workbench (1), an upper mold (6), a lower mold plate (2), a concave mold (4), a movable lower mold (5), a lower mold core (8), a heating system (3) and an ejection system; the lower mold plate (2) is fixed on the workbench (1); the concave mold (4) is located above the lower mold plate (2); a first cavity for mounting the movable lower mold (5) is provided at the center of the concave mold (4); a second cavity for mounting the lower mold core (8) is provided at the center of the movable lower mold (5); the upper mold (6) is located above the movable lower mold (5) and the lower mold core (8); the lower side of the upper mold (6), the upper side and the interior of the movable lower mold (5), The upper side of the lower mold core (8) and the inner side of the die (4) form a molding cavity; the ejection system is used to eject the workpiece (7) in the molding cavity; the heating system (3) is located outside the die (4) and is used to heat the die (4); a first vent hole (16) is provided in the die (4), and a second vent hole (17) is provided in the movable lower mold (5); the first vent hole (16) is connected to the first cavity, and the second vent hole (17) is connected to the first cavity and the molding cavity; inert gas, cooling gas and high-temperature gas can be introduced into the first cavity and the molding cavity through the first vent hole (16).

2. The high temperature alloy hot extrusion pre-forging die according to claim 1, characterized in that: The heating system (3) comprises a heating component and a heat insulation layer, wherein the heat insulation layer is used to wrap the outside of the heating component.

3. The high temperature alloy hot extrusion pre-forging die according to claim 1, characterized in that: A mounting groove is provided on the top of the lower template (2), and a heat insulation pad (9) is provided in the mounting groove.

4. The high temperature alloy hot extrusion pre-forging die according to claim 3, characterized in that: The thermal insulation pad (9) is provided with a vertical mounting through hole, and a support column (19) is provided in the mounting through hole. The lower side of the support column (19) abuts against the mounting groove, and the upper side of the support column (19) abuts against the bottom of the movable lower mold (5) and / or the bottom of the lower mold core (8).

5. The high temperature alloy hot extrusion pre-forging die according to claim 1, characterized in that: The second cavity comprises a first cavity, a second cavity and a third cavity, the first cavity and the third cavity are cylindrical cavities and the diameter of the first cavity is larger than that of the third cavity, the second cavity is a conical cavity, the large diameter end of the second cavity is connected to the first cavity and the small diameter end is connected to the third cavity; the lower mold core (8) comprises a first core segment, a second core segment and a third core segment, the first core segment and the third core segment are cylindrical segments and the diameter of the first core segment is larger than that of the third core segment; the second core segment is a conical segment, the large diameter end of the second core segment is connected to the first core segment and the small diameter end is connected to the third core segment; the diameter of the first core segment matches the diameter of the first cavity and the height of the first core segment is smaller than the height of the first cavity; the diameter of the third core segment is smaller than the diameter of the third cavity; the second core segment and the second cavity have the same conical slope and the height of the second core segment is higher than the second cavity.

6. The high temperature alloy hot extrusion pre-forging die according to claim 1, characterized in that: The ejection system comprises an ejection cylinder (11), a center cylinder (12), an ejector rod (13) and a center rod (14); the output end of the ejection cylinder (11) can drive the center cylinder (12) to reciprocate and can abut against the bottom of the ejector rod (13) to eject the ejector rod (13); the workbench (1) and the lower template (2) are respectively provided with a first ejection hole and a second ejection hole for passing the ejector rod (13); the upper and lower sides of the second ejection hole are respectively connected to the bottom of the first cavity and the top of the first ejection hole; the ejector rod A limit head is provided at the upper end of the lower mold plate (13), and the limit head is located above the lower mold plate (2) and cannot pass through the second ejection hole; a third ejection hole and a fourth ejection hole for passing the center rod (14) are respectively provided at the center of the workbench (1) and the lower mold plate (2), and the upper and lower sides of the fourth ejection hole are respectively connected to the bottom of the second cavity and the top of the third ejection hole; the upper side of the center rod (14) is connected to the bottom of the lower mold core (8), and the lower side of the center rod (14) is connected to the output end of the center cylinder (12).

7. The high temperature alloy hot extrusion pre-forging die according to claim 6, characterized in that: The top of the output end of the central cylinder (12) and the bottom of the lower mold core (8) are both provided with T-slots, and the small ends of the two groups of T-slots are located on the side close to each other; the two ends of the central rod (14) are provided with T-connecting blocks (15) matching the two groups of T-slots, and the T-connecting blocks (15) are laterally slidably connected to the T-slots.

8. The high temperature alloy hot extrusion pre-forging die according to claim 7, characterized in that: A bushing (10) is provided in the fourth ejection hole; the T-shaped connection block (15) can pass through the fourth ejection hole; and the center rod (14) is located in the bushing (10).

9. The high temperature alloy hot extrusion pre-forging die according to claim 1, characterized in that: Displacement sensors (18) are provided on the output ends of the top cylinder (11) and the center rod (14).

10. The high temperature alloy hot extrusion pre-forging die according to claim 1, characterized in that: The movable lower mold (5) comprises a first lower mold section, a second lower mold section and a third lower mold section, the first lower mold section and the third lower mold section are both cylindrical sections and the diameter of the first lower mold section is smaller than the diameter of the third lower mold section, the second lower mold section is a conical section, the large diameter end of the second lower mold section is connected to the third lower mold section and the small diameter end is connected to the first lower mold section; the first cavity comprises a fourth cavity, a fifth cavity and a sixth cavity, the fourth cavity and the sixth cavity are both cylindrical cavities and the diameter of the sixth cavity is larger than the diameter of the fourth cavity; the fifth cavity is a conical cavity, the large diameter end of the fifth cavity is connected to the sixth cavity and the small diameter end is connected to the fourth cavity; the conical surface slopes of the fifth cavity and the second lower mold section are the same; the diameter of the fourth cavity matches the diameter of the first lower mold section and the height of the first lower mold section is higher than the height of the fourth cavity; the diameter of the sixth cavity matches the diameter of the third lower mold section and the height of the third lower mold section is smaller than the height of the sixth cavity.

Images