A powder high-temperature alloy cylindrical part isothermal reverse extrusion molding die

Abstract

This invention discloses an isothermal reverse extrusion molding die for a cylindrical part of a powder high-temperature alloy, comprising an upper die base, a lower die base, an upper die, and a reverse extrusion cylinder, and further comprising: an upper die pressure ring connected to the upper die base, the upper die pressure ring including an inner ring portion with balls disposed on the upper end face of the inner ring portion; the upper die including a flange and an upper die body, the flange fitting into the cavity formed by the upper end face of the inner ring portion and the lower end face of the upper die base, the upper die body penetrating the annular cavity of the inner ring portion and extending downward; an upper die core, the upper die core including an upper die core body and an upper die core connecting portion connected to each other, the upper die body having a downward-facing die core groove, the upper die core body fitting into the die core groove; the upper die and the upper die base correspondingly having a first channel and a second channel for the die core connecting portion to pass through and move up and down; the upper die base connected to the driving end of a first driving member, and the upper die core connecting portion connected to the driving end of a second driving member. This invention can prevent the upper die from shifting and reduce the difficulty of demolding.

Description

Technical Field

[0001] This invention relates to the field of thermoforming, and in particular to an isothermal reverse extrusion molding die for powder high-temperature alloy cylindrical parts. Background Technology

[0002] As modern aero-engines place increasingly higher demands on overall performance, such as thrust-to-weight ratio, reliability, weight reduction, and low fuel consumption, high-temperature alloys are increasingly being chosen for critical hot-end components operating in harsh environments and under complex stresses. The drum shaft, a key component connecting the compressor and high-pressure turbine within an aero-engine, withstands temperatures exceeding 600°C and high circumferential stresses, necessitating its fabrication using powder metallurgy superalloys. However, due to the high deformation resistance and narrow temperature window of powder metallurgy superalloys, isothermal reverse extrusion is typically used to form drum shaft forgings. This method leverages the temperature control stability advantages of isothermal forging technology and the low load of reverse extrusion forming.

[0003] However, in current isothermal reverse extrusion methods for cylindrical parts, the upper and lower dies are fixed to upper and lower die holders, respectively. After the first reverse extrusion is completed and the upper die is pulled out of the cylindrical part, the bolts fixing the upper die may loosen slightly due to the large demolding force. When the upper die is pressed down again to prepare for the second reverse extrusion, it is prone to misalignment, resulting in poor coaxiality, large wall thickness differences, and uneven microstructure of the cylindrical part. Furthermore, the cylindrical part may easily stick to the upper die, making demolding difficult. The former problem is not easily detected immediately, and readjusting the die at high temperatures is difficult, time-consuming, and labor-intensive, with minimal effect. The latter problem is usually addressed by repeatedly pressing and lifting the upper die, utilizing the friction of the reverse extrusion cylinder to achieve demolding. This leads to low-temperature, small deformation of the cylindrical part's end face, resulting in abnormally coarse grains.

[0004] Therefore, how to prevent the upper mold from shifting and how to reduce the difficulty of demolding are key issues that urgently need to be addressed by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to prevent the upper mold from shifting and to reduce the difficulty of demolding.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A powder high-temperature alloy cylindrical part isothermal reverse extrusion molding die includes an upper die base, a lower die base, an upper die, and a reverse extrusion cylinder, and further includes:

[0008] The upper mold pressure ring is connected to the upper mold base. The upper mold pressure ring includes an inner ring portion, and a ball is provided on the upper end face of the inner ring portion. The upper mold includes a flange and an upper mold body. The flange is adapted to fit into the cavity formed by the upper end face of the inner ring portion and the lower end face of the upper mold base, and the flange is placed on the ball. The upper mold body passes through the annular cavity of the inner ring portion and extends downward.

[0009] The upper mold core includes an upper mold core body and an upper mold core connecting part connected to each other. The upper mold core body is provided with a mold core groove with an opening facing downward. The upper mold core body is adapted to fit into the mold core groove. The upper mold and the upper mold base are respectively provided with a first channel and a second channel for the mold core connecting part to pass through and move up and down. The upper mold base is connected to the driving end of the first driving member, and the upper mold core connecting part is connected to the driving end of the second driving member.

[0010] Preferably, the bottom end face of the upper mold core body is provided with a downwardly protruding first positioning boss, which is adapted to the first positioning recess on the reverse extrusion blank.

[0011] Preferably, the first positioning boss is an inverted cone shape.

[0012] Preferably, the upper surface of the inner ring is provided with a ball groove, the balls are rotatably disposed in the ball groove, and there are multiple balls disposed along the ball groove.

[0013] Preferably, the ball groove is an annular groove, which is arranged around the center of the upper molding ring; or the ball groove is a straight groove extending radially along the inner ring, and there are multiple straight grooves, which are radially distributed.

[0014] Preferably, the upper mold pressing ring further includes an outer ring portion, which is connected to the outer diameter side of the inner ring portion and is located above the inner ring portion. The outer ring portion is connected to the upper mold base by bolts.

[0015] Preferably, it further includes a lower die core, the lower die core including a lower die core body and a lower die core connecting part, the lower die core body being adapted to the inside of the reverse extrusion cylinder, the upper end face of the lower die core body contacting the lower end face of the reverse extrusion blank, the lower die base being provided with a third channel for the lower die core connecting part to pass through and move up and down, and the lower die core connecting part being connected to the driving end of the third driving member.

[0016] Preferably, the upper end face of the lower die core body is provided with an upwardly protruding second positioning boss, and the lower end face of the reverse extrusion blank is provided with a second positioning recess that matches the second positioning boss.

[0017] Preferably, it further includes an upper pad and a lower pad, wherein the lower end face of the upper mold base is provided with an upper pad cavity adapted to the upper pad, and the upper mold pressure ring is connected to the upper pad by bolts; the upper end face of the lower mold base is provided with a lower pad cavity adapted to the lower pad, and the reverse extrusion cylinder is connected to the lower pad by bolts.

[0018] Preferably, it also includes an upper heating furnace and a lower heating furnace, the upper heating furnace being connected to the upper mold base and the lower heating furnace being connected to the lower mold base, wherein the upper heating furnace and the lower heating furnace come into contact when the upper mold moves down to the lower stop position.

[0019] As can be seen from the above technical solution, during the demolding process of the upper mold body, the cylindrical part is pressed down by the upper mold core, thus allowing the upper mold body to be demolded in one go. During the demolding process of the upper mold core, the friction between the upper mold body and the cylindrical part acts on the cylindrical part, breaking the adhesive force between the cylindrical part and the upper mold core, thereby facilitating the demolding of the upper mold core. In addition, the lower bottom area of ​​the upper mold core and the smaller contact area with the cylindrical part result in a smaller demolding force, further ensuring successful demolding of the upper mold core in one go. Because the demolding force that the upper mold core needs to overcome during demolding is small, the upper mold core is less prone to misalignment, and the upper mold core and the reverse extrusion blank can maintain a high degree of coaxiality. Therefore, the upper mold core can provide a high-precision guiding force for the upper mold body, effectively ensuring the coaxiality of the upper mold body and the reverse extrusion blank, thus preventing misalignment of the upper mold. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is an assembly diagram of the isothermal reverse extrusion molding die for a high-temperature alloy powder cylindrical part disclosed in a specific embodiment of the present invention;

[0022] Figure 2 This is a top view of the upper molded ring disclosed in a specific embodiment of the present invention;

[0023] Figure 3 for Figure 2 Sectional view along the middle AA direction;

[0024] Figure 4 This is a cross-sectional view of the reverse-extruded billet disclosed in a specific embodiment of the present invention;

[0025] Figure 5 This is a cross-sectional view of a cylindrical component disclosed in a specific embodiment of the present invention.

[0026] The names of the components are as follows:

[0027] 1-Upper mold base, 2-Upper pad, 3-Upper mold, 4-Upper mold core, 5-Reverse extrusion cylinder, 6-Reverse extrusion blank, 7-Lower mold core, 8-Lower pad, 9-Lower mold base, 10-Upper mold pressure ring, 11-Ball, 12-Upper heating furnace, 13-Lower heating furnace, 14-Cylindrical part, 15-Bolt, 16-Groove, 17-First positioning recess, 18-First positioning boss, 19-Second positioning boss, 20-Second positioning recess. Detailed Implementation

[0028] In view of this, the core of the present invention is to design an isothermal reverse extrusion molding die for powder high-temperature alloy cylindrical parts, so as to prevent the upper die from shifting and reduce the difficulty of demolding.

[0029] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Please refer to the attached document. Figure 1 -Appendix Figure 5 The present invention discloses an isothermal reverse extrusion forming die for a powder high-temperature alloy cylindrical part 14, including an upper die base 1, a lower die base 9, an upper die 3 and an extrusion cylinder, and in particular, it also includes an upper die pressure ring 10 and an upper die core 4.

[0031] The upper mold pressure ring 10 is connected to the upper mold base 1. The upper mold pressure ring 10 includes an inner ring portion, and a ball bearing 11 is provided on the upper end face of the inner ring portion. The upper mold 3 includes an upper mold body and a flange. The flange is adapted to fit within the cavity formed by the upper end face of the inner ring portion and the lower end face of the upper mold base 1, and the flange is placed on the ball bearing 11. The upper mold body penetrates through the annular cavity of the inner ring portion and extends downward. The upper mold core 4 includes an upper mold core body and an upper mold core connecting portion that are connected to each other. The upper mold body is provided with a mold core groove with its opening facing downward. The upper mold core body is adapted to fit within the mold core groove. The upper mold 3 and the upper mold base 1 are respectively provided with a first channel and a second channel, and the upper mold connecting portion passes through the first channel and the second channel sequentially from bottom to top. The upper mold base 1 is connected to the driving end of the first driving member, and the upper mold core connecting portion is connected to the driving end of the second driving member.

[0032] During the reverse extrusion process, the upper die core 4 independently moves downward to press down on the reverse extrusion blank 6. Then, the upper die 3, driven by the upper die base 1, presses downward. Under the guidance of the upper die core 4, the flange of the upper die 3 moves in alignment on the ball bearings 11 to ensure that the upper die body is coaxial with the reverse extrusion blank 6. After the upper die body contacts the reverse extrusion blank 6, it presses downward synchronously with the upper die core 4 to complete the reverse extrusion forming of the cylindrical part 14. Even if the connection between the upper die 3 and the upper die base 1 becomes loose, the upper die 3 can still be coaxial with the reverse extrusion blank 6 under the guidance of the upper die core 4. After the reverse extrusion is completed, the upper die core 4 first presses down on the bottom center of the cylindrical part 14 and remains stationary. The upper die body moves upward under the drive of the upper die base 1, separating from the inner wall of the cylindrical part 14. After the upper die body is demolded, the upper die core 4 then moves upward independently to detach from the cylindrical part 14.

[0033] During the demolding process of the upper mold body, the cylindrical part 14 is pressed down by the upper mold core 4, allowing the upper mold body to be demolded in one go. During the demolding process of the upper mold core 4, the friction between the upper mold body and the cylindrical part 14 acts on the cylindrical part 14, breaking the adhesive force between the cylindrical part 14 and the upper mold core 4, thus facilitating the demolding of the upper mold core 4. In addition, the lower bottom area of ​​the upper mold core 4 and the smaller contact area with the cylindrical part 14 result in a smaller demolding force, further ensuring the successful demolding of the upper mold core 4 in one go. Because the demolding force that the upper mold core 4 needs to overcome during demolding is small, the upper mold core 4 is less prone to misalignment, and the upper mold core 4 and the reverse extrusion blank 6 can maintain a high degree of coaxiality. Therefore, the upper mold core 4 can provide a high-precision guiding force for the upper mold body, effectively ensuring the coaxiality of the upper mold body and the reverse extrusion blank 6.

[0034] The bottom end face of the upper die core body is provided with a downward protruding first positioning boss 18, which is adapted to the first positioning recess 17 on the reverse extrusion blank 6. When the upper die core 4 moves downward independently during reverse extrusion, the first positioning boss 18 of the upper die core body first enters the first positioning recess 17, thereby positioning the upper die core body and ensuring the coaxiality of the upper die core body and the reverse extrusion blank 6.

[0035] Furthermore, the first positioning boss 18 is configured as an inverted cone shape, with its tip pointing downwards. The first positioning recess 17 is correspondingly also an inverted cone shape. During the downward movement of the upper die core body, the tip of the first positioning boss 18 easily enters the first positioning recess 17, thus achieving initial positioning. As the upper die core body moves downwards, the first positioning boss 18 continuously enters the first positioning recess 17. Due to the constraint of the first positioning recess 17, the first positioning boss 18 finely adjusts its position to be coaxial with the first positioning recess 17, thereby ensuring the coaxiality of the upper die core body and the reverse extrusion blank 6.

[0036] The upper end face of the inner ring of the upper molding ring 10 is provided with a ball groove, and the balls 11 are rotatably embedded in the ball groove. There are multiple balls 11 arranged along the ball groove. The ball groove constrains the balls 11 in the ball groove to prevent the balls 11 from falling out of the upper molding ring 10.

[0037] In one specific embodiment of the present invention, the ball groove is an annular groove, which is arranged around the center of the upper molding ring 10, or in other words, the annular groove is concentric with the upper molding ring 10. Multiple annular grooves can be arranged concentrically. The ball groove can also be a straight groove, extending radially along the inner ring portion. Multiple straight grooves can be arranged radially. The ball groove can also be an elliptical groove or other irregularly shaped grooves; the present invention does not specifically limit this.

[0038] The upper mold pressure ring 10 includes an inner ring portion and an outer ring portion. The outer ring portion is connected to the outer diameter side of the inner ring portion and is located above the inner ring portion. The outer ring portion is connected to the upper mold base 1 by bolts.

[0039] The isothermal reverse extrusion molding die for the powder high-temperature alloy cylindrical part 14 also includes a lower die core 7, which comprises a lower die core 7 body and a lower die core connecting part. The lower die core 7 body is adapted to the reverse extrusion cylinder 5 and is located at the bottom of the reverse extrusion cylinder 5. The upper end face of the lower die core 7 body contacts the lower end face of the reverse extrusion blank 6. A third channel is provided on the lower die base 9, through which the lower die core connecting part passes and moves up and down. The lower die core connecting part is connected to the driving end of the third driving member. When the cylindrical part 14 is demolded, the lower die core 7 pushes the cylindrical part 14 upward, completing the demolding of the cylindrical part 14 from the reverse extrusion cylinder 5.

[0040] This invention includes a hydraulic press. The upper crossbeam of the hydraulic press serves as the first driving component, used to drive the upper mold base 1 to move independently up and down. The upper ejection mechanism of the hydraulic press serves as the second driving component, used to drive the upper mold core 4 to move independently up and down. The lower ejection mechanism of the hydraulic press serves as the third driving component, used to drive the lower mold core 7 to move up and down.

[0041] The upper end face of the lower die core 7 body is provided with an upwardly protruding second positioning boss 19, and the lower end face of the reverse extrusion blank 6 is provided with a second positioning recess 20 that matches the second positioning boss 19. When the reverse extrusion blank 6 is placed into the reverse extrusion cylinder 5, it is ensured to contact and be centered with the lower die core 7. When the reverse extrusion blank 6 is placed into the reverse extrusion cylinder 5, ensuring that the second positioning boss 19 on the upper end face of the lower die core 7 body is placed within the second positioning recess 20 on the lower end face of the reverse extrusion blank 6 is sufficient to ensure that the reverse extrusion blank 6 and the lower die core 7 are centered.

[0042] The molding die of this invention also includes an upper pad and a lower pad 8. An upper pad cavity is provided on the lower end face of the upper die holder 1, and the upper pad is placed within the upper pad cavity. The upper die pressure ring 10 is bolted to the upper pad. The upper pad supports the upper die body, thereby preventing the upper die holder 1 from being directly subjected to force. A lower pad cavity is provided on the upper end face of the lower die holder 9, and the lower pad 8 is placed within the lower pad cavity. The counter-extrusion cylinder 5 is bolted to the lower pad 8. The lower pad 8 resists the extrusion force during the counter-extrusion of the upper die 3 and the upper die core 4, thereby preventing the lower die holder 9 from being directly subjected to force.

[0043] The reverse extrusion molding die of this invention also includes an upper heating furnace 12 and a lower heating furnace 13. The upper heating furnace 12 is connected to the upper mold base 1, and the lower heating furnace 13 is connected to the lower mold base 9. When the upper mold 3 and the upper mold core 4 reverse extrude and move downward to the lower stop position, the upper heating furnace 12 and the lower heating furnace 13 come into contact, forming a closed space to facilitate heating of the cylindrical part 14.

[0044] The isothermal reverse extrusion forming method for powder high-temperature alloy cylindrical parts 14 includes:

[0045] Step 1: Preparation of fine-grained powder superalloy blanks

[0046] The outer diameter D0 of the required fine-grained powder superalloy billet is determined based on the outer diameter D0 of the cylindrical part 14. The volume of the required billet is then calculated based on the volume of the cylindrical part 14 plus the process allowance. The height H0 of the required fine-grained powder superalloy billet is calculated according to the principle of equal volume. The superalloy powder is then prepared into a fine-grained billet with a diameter D0 and a height H0 using either a hot extrusion method or a upset method. The fine-grained structure is characterized by an average grain diameter of 2 μm to 10 μm.

[0047] Step 2: Processing the reverse extrusion billet 6

[0048] The diameter of the fine-grained powder high-temperature alloy blank obtained in step one is reduced by 1-3 mm on one side, that is, the diameter is processed to D0-(1-3) mm. Then, a groove 16 and a first positioning recess 17 are machined at the center of the upper end face of the reverse extrusion blank 6. The inner diameter of the groove 16 is the same as the inner diameter of the cylindrical part 14 and the outer diameter of the working zone of the upper die 3. The depth of the groove 16 is 1 / 30 to 1 / 20 of the depth of the cylindrical part 14. The first positioning recess 17 is engaged with the first positioning boss 18 of the upper die core 4. Then, a second positioning recess 20 is machined at the center of the lower end face of the fine-grained powder high-temperature alloy blank. The second positioning recess 20 is engaged with the second positioning boss 19 on the lower die core 7.

[0049] Step 3: Sandblasting of the reverse-extruded billet 6

[0050] The entire surface of the reverse extrusion billet 6 is sandblasted using a sandblasting machine to remove oil and other contaminants, resulting in a gray, textured surface.

[0051] Step 4: Apply lubricant

[0052] Preheat the surface of the reverse extrusion blank 6 to 80-150°C, and apply a layer of special glass lubricant evenly to the entire surface of the reverse extrusion blank 6 by spraying or brushing. The thickness of the lubricant layer is 0.1-0.3 mm.

[0053] Step 5: Mold assembly and heating

[0054] Install an upper pad on the upper mold base 1, assemble the flange of the upper mold 3 onto the inner ring of the upper mold pressure ring 10, and lock the upper mold pressure ring 10 onto the upper pad with bolts. Then, lock the upper heating furnace 12 onto the upper mold base 1 with bolts. Install a lower pad 8 on the lower mold base 9, and lock the reverse extrusion cylinder 5 onto the lower pad 8 with bolts. Place a lower mold core 7 inside the reverse extrusion cylinder 5, with the lower mold core connecting part passing through the lower pad 8 and the lower mold base 9 in sequence. Lock the lower heating furnace 13 onto the lower mold base 9 with bolts. Place the assembled reverse extrusion molding die onto the worktable of the hydraulic press. The upper mold base 1 is connected to the upper crossbeam of the hydraulic press, and the upper mold core connecting part is connected to the upper ejection mechanism of the hydraulic press. The lower mold core connecting part is connected to the lower ejection mechanism of the hydraulic press. After assembly, power is supplied to the upper heating furnace 12 and the lower heating furnace 13, and the heating temperature is set to 1050℃~1100℃ with a holding time of 5~10 hours.

[0055] Step 6: Heating the reverse-extruded billet 6

[0056] The reverse-extruded billet 6 is placed in a dedicated heating furnace for reverse-extruded billets and heated to a temperature of 1050℃~1100℃. The holding time is calculated using the following formula:

[0057] T = L × 0.8 min / mm Where: L is selected as the smaller of the diameter and height of the reverse extrusion blank 6.

[0058] Step 7: Transfer of the reverse-extruded billet 6

[0059] After the reverse-extruded billet 6 exits the furnace, glass powder lubricant is placed in the groove 16 on its upper end face, but no glass powder lubricant is placed in the first positioning recess 17. The reverse-extruded billet 6 is then placed into the reverse-extruded cylinder 5 at a temperature of 1050℃~1100℃, and it contacts and centers with the lower mold core 7. The upper mold 3 and the upper mold core 4 move downwards and stop when they are about to contact the reverse-extruded billet 6, and are held at that temperature for 1~3 minutes. The upper mold 3 and the upper heating furnace 12 move with the upper mold base 1. When the upper mold 3 and the upper mold core 4 are about to contact the reverse-extruded billet 6, the distance between the upper heating furnace 12 and the lower heating furnace 13 is small, and the upper heating furnace 12 and the lower heating furnace 13 form a relatively closed space, thereby causing the glass powder lubricant in the groove 16 to melt into a liquid state.

[0060] Step 8: Reverse Extrusion

[0061] The upper die core 4 independently descends to press down on the reverse extrusion blank 6, and the upper die core 4 and the reverse extrusion blank 6 cooperate through the first positioning boss 18 and the first positioning recess 17 to ensure coaxiality. Then, the floating upper die 3 is pressed downward under the drive of the upper die base 1, and through the guiding action of the upper die core 4 and the auxiliary action of the ball bearing 11, the upper die 3 and the reverse extrusion blank 6 are made coaxial. After the upper die 3 contacts the reverse extrusion blank 6, it presses down synchronously with the upper die core 4 to complete the reverse extrusion forming of the cylindrical part 14. Since the groove 16 is provided with liquid glass powder lubricant, the liquid glass powder lubricant plays a uniform lubricating role during the reverse extrusion process of the upper die 3 and the upper die core 4.

[0062] Step 9: Demolding of cylindrical part 14

[0063] After the reverse extrusion is completed, the upper mold core 4 presses down on the bottom center of the cylindrical part 14 and keeps it still. The upper mold 3 moves upward under the drive of the upper mold base 1 and separates from the inner wall of the cylindrical part 14. After the upper mold 3 is demolded, the upper mold core 4 moves upward independently and separates from the cylindrical part 14. Finally, the lower mold core 7 pushes the cylindrical part 14 upward, completing the demolding of the cylindrical part 14 from the reverse extrusion cylinder 5. The entire reverse extrusion process ends.

[0064] Step 10: Slow cooling of cylindrical component 14

[0065] The cylindrical part 14 obtained in step nine is taken by a robotic arm and placed in a drying area to be covered with aluminum silicate fiber felt for slow cooling at a rate of ≤50℃ / h.

[0066] In the description of this invention, it should be noted that the terms "upper", "lower", "bottom", "horizontal", "center", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0067] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0068] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A powder high-temperature alloy cylindrical isothermal reverse extrusion molding die, comprising an upper die base (1), a lower die base (9), an upper die (3), and a reverse extrusion cylinder (5), characterized in that, Also includes: The upper die pressure ring (10) is connected to the upper die base (1). The upper die pressure ring (10) includes an inner ring portion. The upper end face of the inner ring portion is provided with a ball (11). The upper surface of the inner ring portion is provided with a ball groove. The ball (11) is rotatably disposed in the ball groove. The ball (11) is a plurality of balls disposed along the ball groove. The upper die (3) includes a flange and an upper die body. The flange is adapted to the cavity formed by the upper end face of the inner ring portion and the lower end face of the upper die base (1). The flange is placed on the ball (11). The upper die body penetrates the annular cavity of the inner ring portion and extends downward. The bottom end face of the upper die core body is provided with a downward protruding first positioning boss (18). The first positioning boss (18) is adapted to the first positioning recess (17) on the reverse extrusion blank (6). The upper mold core (4) includes an upper mold core body and an upper mold core connecting part connected to each other. The upper mold core body is provided with a mold core groove with an opening facing downward. The upper mold core body is adapted to the mold core groove. The upper mold (3) and the upper mold base (1) are respectively provided with a first channel and a second channel for the mold core connecting part to pass through and move up and down. The upper mold base (1) is connected to the driving end of the first driving member, and the upper mold core connecting part is connected to the driving end of the second driving member. The lower die core (7) includes a lower die core body and a lower die core connecting part. The lower die core body is adapted to the inside of the reverse extrusion cylinder (5). The upper end face of the lower die core body is in contact with the lower end face of the reverse extrusion blank (6). The lower die base (9) is provided with a third channel for the lower die core connecting part to pass through and move up and down. The lower die core connecting part is connected to the driving end of the third driving member.

2. The isothermal reverse extrusion forming die for powder high-temperature alloy cylindrical parts according to claim 1, characterized in that, The first positioning boss (18) is an inverted cone shape.

3. The isothermal reverse extrusion molding die for powder high-temperature alloy cylindrical parts according to claim 1, characterized in that, The ball groove is an annular groove, which is arranged around the center of the upper molding ring (10); or the ball groove is a straight groove extending radially along the inner ring, and there are multiple straight grooves, which are radially distributed.

4. The isothermal reverse extrusion forming die for powder high-temperature alloy cylindrical parts according to claim 1, characterized in that, The upper molding ring (10) also includes an outer ring portion, which is connected to the outer diameter side of the inner ring portion and is located above the inner ring portion. The outer ring portion is connected to the upper mold base (1) by bolts.

5. The isothermal reverse extrusion forming die for powder high-temperature alloy cylindrical parts according to claim 1, characterized in that, The upper end face of the lower die core body is provided with an upwardly protruding second positioning boss (19), and the lower end face of the reverse extrusion blank (6) is provided with a second positioning recess (20) that matches the second positioning boss (19).

6. The isothermal reverse extrusion forming die for powder high-temperature alloy cylindrical parts according to claim 1, characterized in that, It also includes an upper pad (2) and a lower pad (8). The lower end face of the upper mold base (1) is provided with an upper pad cavity that is adapted to the upper pad (2). The upper mold pressure ring (10) is connected to the upper pad (2) by bolts. The upper end face of the lower mold base (9) is provided with a lower pad cavity that is adapted to the lower pad (8). The reverse extrusion cylinder (5) is connected to the lower pad (8) by bolts.

7. The isothermal reverse extrusion molding die for powder high-temperature alloy cylindrical parts according to claim 1, characterized in that, It also includes an upper heating furnace (12) and a lower heating furnace (13). The upper heating furnace (12) is connected to the upper mold base (1), and the lower heating furnace (13) is connected to the lower mold base (9). When the upper mold (3) moves down to the lower stop position, the upper heating furnace (12) and the lower heating furnace (13) come into contact.

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