Isothermal backward extrusion forming die for powder high-temperature alloy cylindrical part

Abstract

The invention discloses a powder high-temperature alloy cylindrical part isothermal backward extrusion forming die which comprises an upper die base, a lower die base, an upper die and a backward extrusion cylinder and further comprises an upper die pressing ring, the upper die pressing ring is connected with the upper die base and comprises an inner ring part, balls are arranged on the upper end face of the inner ring part, and the upper die comprises a flange and an upper die body. The flange is arranged in a cavity defined by the upper end face of the inner ring part and the lower end face of the upper die base in a matched mode, and the upper die body penetrates through an annular cavity of the inner ring part and extends downwards. The upper die core comprises an upper die core body and an upper die core connecting part which are connected with each other, a die core groove with a downward opening is formed in the upper die body, the upper die core body is arranged in the die core groove in a matched mode, and the upper die and the upper die base are correspondingly provided with a first channel and a second channel for the die core connecting part to penetrate through and move up and down; the upper die base is connected with the driving end of the first driving piece, and the upper die core connecting part is connected with the driving end of the second driving piece. The upper mold can be prevented from being dislocated, and the demolding difficulty is reduced.

Description

Technical Field

[0001] The invention relates to the field of hot forming, in particular to an isothermal reverse extrusion forming die for a powder high-temperature alloy cylindrical part. Background Art

[0002] As modern aircraft engines have higher and higher requirements for overall performance such as thrust-to-weight ratio, reliability, weight reduction and low fuel consumption, more and more high-temperature alloys are chosen for key hot-end components with harsh service environments and complex stresses. The drum shaft is a key component connecting the compressor and the high-pressure turbine in the aircraft engine. It is subjected to high temperatures and high cyclic stresses above 600°C and must be made of powder high-temperature alloys. However, due to the high deformation resistance and narrow temperature window of powder high-temperature alloys, the isothermal reverse extrusion method is usually used to form the drum shaft forgings, while taking advantage of the temperature control stability of the isothermal forging technology and the low load of the reverse extrusion forming.

[0003] However, in the current isothermal back-extrusion method for cylindrical parts, the upper die and the lower die are fixed to the upper and lower die seats respectively. When the first back-extrusion is completed and the upper die pulls out the cylindrical part, the bolts fixing the upper die become slightly loose due to the large demoulding force. When the upper die is pressed down again to prepare for back-extrusion of the second part, the upper die is prone to dislocation, resulting in poor coaxiality, large wall thickness difference, and uneven structure of the cylindrical part, as well as the problem that the cylindrical part easily holds the upper die and is difficult to demould. The former problem is not easy to be discovered at the first time, and it is difficult to readjust the mold at high temperature, which is time-consuming and labor-intensive, and has little effect. The latter problem is usually achieved by repeatedly pressing down and lifting the upper die, and using the friction of the back-extrusion barrel to realize the demoulding of the upper die, which causes a small low-temperature deformation of the end face of the cylindrical part and produces abnormal coarse grains.

[0004] Therefore, how to prevent the upper mold from shifting and how to reduce the difficulty of demoulding are key issues that technical personnel in this field need to solve urgently. Summary of the invention

[0005] In view of this, an object of the present invention is to prevent the upper mold from being dislocated and to reduce the difficulty of demoulding.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A powder high-temperature alloy cylindrical isothermal reverse extrusion forming die, comprising an upper die seat, a lower die seat, an upper die and a reverse extrusion cylinder, and also comprising:

[0008] An upper die pressing ring, the upper die pressing ring is connected to the upper die seat, the upper die pressing ring comprises an inner ring portion, the upper end surface of the inner ring portion is provided with a ball, the upper die comprises a flange and an upper die body, the flange is adapted to fit in a cavity surrounded by the upper end surface of the inner ring portion and the lower end surface of the upper die seat, and the flange is placed on the ball, and the upper die body penetrates the annular cavity of the inner ring portion and extends downward;

[0009] An upper mold core, the upper mold core includes an upper mold core body and an upper mold core connecting part that are connected to each other, the upper mold body is provided with a core groove opening downward, the upper mold core body is adapted to be in the core groove, the upper mold and the upper mold base are correspondingly provided with a first channel and a second channel for the 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 surface of the upper mold core body is provided with a first positioning boss protruding downward, and the first positioning boss is adapted to the first positioning pit on the reverse extrusion blank.

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

[0012] Preferably, a ball groove is provided on the upper surface of the inner ring portion, the ball is rollably disposed in the ball groove, and a plurality of balls are disposed along the ball groove.

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

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

[0015] Preferably, it also includes a lower mold core, which includes a lower mold core body and a lower mold core connecting part, the lower mold core body is adapted to be inside the reverse extrusion cylinder, the upper end surface of the lower mold core body is in contact with the lower end surface of the reverse extrusion blank, and the lower mold base is provided with a third channel for the lower mold core connecting part to pass through and move up and down, and the lower mold core connecting part is connected to the driving end of the third driving member.

[0016] Preferably, the upper end surface of the lower mold core body is provided with a second positioning boss protruding upward, and the lower end surface of the reverse extrusion blank is provided with a second positioning pit adapted to the second positioning boss.

[0017] Preferably, it also includes an upper pad and a lower pad, the lower end surface of the upper die base is provided with an upper pad cavity adapted to the upper pad, and the upper die pressing ring is connected to the upper pad by bolts; the upper end surface of the lower die base is provided with a lower pad cavity adapted to the lower pad, and the back-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 is connected to the upper mold base, and the lower heating furnace is connected to the lower mold base. When the upper mold moves down to the lower stop position, the upper heating furnace and the lower heating furnace are in contact.

[0019] It can be seen from the above technical scheme that: during the demoulding process of the upper mold body, since the cylindrical part is pressed by the upper mold core, the upper mold body can be demoulded in one go. During the demoulding process of the upper mold core, since the friction between the upper mold body and the cylindrical part acts on the cylindrical part, the adhesion between the cylindrical part and the upper mold core can be broken, which is beneficial to the demoulding of the upper mold core. In addition, the bottom area of ​​the upper mold core is small, and the contact area with the cylindrical part is small, so the required demoulding force is small, which further ensures the successful demoulding of the upper mold core in one go. Since the demoulding force that the upper mold core needs to overcome during demoulding is small, the upper mold core is not easy to move, and the upper mold core and the reverse extrusion blank can maintain a high coaxiality. Therefore, the upper mold core can provide a high-precision guiding force for the upper mold body, thereby effectively ensuring the coaxiality of the upper mold body and the reverse extrusion blank, so that the upper mold can be prevented from moving. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

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

[0022] Figure 2 A top view of an upper mold ring disclosed in a specific embodiment of the present invention;

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

[0024] Figure 4 A cross-sectional view of a reverse extrusion blank disclosed in a specific embodiment of the present invention;

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

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

[0027] 1-upper die seat, 2-upper pad, 3-upper die, 4-upper die core, 5-reverse extrusion cylinder, 6-reverse extrusion blank, 7-lower die core, 8-lower pad, 9-lower die seat, 10-upper die pressure ring, 11-ball, 12-upper heating furnace, 13-lower heating furnace, 14-cylindrical part, 15-bolt, 16-groove, 17-first positioning pit, 18-first positioning boss, 19-second positioning boss, 20-second positioning pit. DETAILED DESCRIPTION

[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 to prevent the upper die from shifting and reduce the difficulty of demolding.

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

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

[0031] Among them, 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 11 is arranged on the upper end surface of the inner ring portion. The upper mold 3 includes an upper mold body and a flange, the flange is adapted to the cavity surrounded by the upper end surface of the inner ring portion and the lower end surface of the upper mold base 1, and the flange is placed on the ball 11. The upper mold body passes 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 connected to each other. A core groove with an opening facing downward is arranged on the upper mold body. The upper mold core body is adapted in the core groove. The upper mold 3 and the upper mold base 1 are correspondingly provided with a first channel and a second channel, and the upper mold connecting portion passes through the first channel and the second channel in sequence 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, the upper mold core 4 moves downward independently to press the reverse extrusion blank 6, and then the upper mold 3 is pressed downward under the drive of the upper mold base 1. Under the guidance of the upper mold core 4, the flange of the upper mold 3 moves on the ball 11 to ensure that the upper mold body is coaxial with the reverse extrusion blank 6. After the upper mold body contacts the reverse extrusion blank 6, it is pressed downward synchronously with the upper mold core 4 to complete the reverse extrusion molding of the cylindrical part 14. Even if the connection between the upper mold 3 and the upper mold base 1 is loose, the upper mold 3 can still be coaxial with the reverse extrusion blank 6 under the guidance of the upper mold core 4. After the reverse extrusion is completed, the upper mold core 4 first presses the bottom center of the cylindrical part 14 to keep it still, and the upper mold body moves upward under the drive of the upper mold base 1 to separate from the inner wall of the cylindrical part 14. After the upper mold body is demolded, the upper mold core 4 moves upward independently to separate from the cylindrical part 14.

[0033] During demoulding of the upper mold body, since the cylindrical member 14 is pressed by the upper mold core 4, the upper mold body can be demoulded in one go. During demoulding of the upper mold core 4, since the friction between the upper mold body and the cylindrical member 14 acts on the cylindrical member 14, the adhesion between the cylindrical member 14 and the upper mold core 4 can be broken, thereby facilitating demoulding of the upper mold core 4. In addition, the bottom area of ​​the upper mold core 4 is small, and the contact area with the cylindrical member 14 is small, so the required demoulding force is small, further ensuring that the upper mold core 4 is successfully demoulded in one go. Since the demoulding force that the upper mold core 4 needs to overcome during demoulding is small, the upper mold core 4 is not easy to move, and the upper mold core 4 and the reverse extrusion blank 6 can maintain a high coaxiality. Therefore, the upper mold core 4 can provide a high-precision guiding force for the upper mold body, thereby effectively ensuring the coaxiality of the upper mold body and the reverse extrusion blank 6.

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

[0035] Furthermore, the first positioning boss 18 is set to be an inverted cone. The tip of the first positioning boss 18 faces downward. The first positioning pit 17 is correspondingly an inverted cone. During the downward movement of the upper core body, the tip of the first positioning boss 18 can easily enter the first positioning pit 17, thus forming a preliminary positioning. As the upper core body descends, the first positioning boss 18 continuously enters the first positioning pit 17. Due to the restraining effect of the first positioning pit 17, the first positioning boss 18 fine-tunes its position to be coaxial with the first positioning pit 17, thereby ensuring the coaxiality of the upper core body and the reverse extrusion blank 6.

[0036] The upper end surface of the inner ring of the upper die pressing ring 10 is provided with a ball groove, in which the ball 11 is rollably embedded, and a plurality of balls 11 are arranged along the ball groove. The ball groove constrains the ball 11 in the ball groove to prevent the ball 11 from escaping from the upper die pressing ring 10.

[0037] In a specific embodiment of the present invention, the ball groove is an annular groove, which is arranged around the center of the upper mold ring 10, or the annular groove is concentric with the upper mold ring 10. The annular groove can be a plurality of concentrically arranged annular grooves. The ball groove can also be a linear groove, which extends along the radial direction of the inner ring portion. There are multiple linear grooves, and the multiple linear grooves are radially distributed. The ball groove can also be an elliptical groove or other special-shaped grooves, which are not specifically limited by the present invention.

[0038] The upper die pressing ring 10 includes not only an inner ring portion but also 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 die seat 1 by bolts.

[0039] The isothermal reverse extrusion forming die of the powder high-temperature alloy cylindrical part 14 also includes a lower mold core 7, which includes a lower mold core 7 body and a lower mold core connecting part. The lower mold core 7 body is adapted to be inside the reverse extrusion cylinder 5 and is located at the bottom of the reverse extrusion cylinder 5. The upper end surface of the lower mold core 7 body contacts the lower end surface of the reverse extrusion blank 6. A third channel is provided on the lower mold base 9, and the third channel is for the lower mold core connecting part to pass through and move up and down therein. The lower mold core connecting part is connected to the driving end of the third driving member. When the cylindrical part 14 is demolded, the lower mold core 7 pushes the cylindrical part 14 upward to complete the demolding of the cylindrical part 14 and the reverse extrusion cylinder 5.

[0040] The present invention is provided with a hydraulic press, the upper crossbeam of the hydraulic press is the first driving member, which is used to drive the upper die seat 1 to move up and down independently. The upper ejection mechanism of the hydraulic press is the second driving member, which is used to drive the upper die core 4 to move up and down independently. The lower ejection mechanism of the hydraulic press is the third driving member, which is used to drive the lower die core 7 to move up and down.

[0041] The upper end surface of the lower mold core 7 body is provided with a second positioning boss 19 protruding upward, and the lower end surface of the reverse extrusion blank 6 is provided with a second positioning recess 20 adapted to the second positioning boss 19. When the reverse extrusion blank 6 is placed in the reverse extrusion cylinder 5, it is ensured that it is in contact with and centered with the lower mold core 7. When the reverse extrusion blank 6 is placed in the reverse extrusion cylinder 5, it is ensured that the second positioning boss 19 on the upper end surface of the lower mold core 7 body is placed in the second positioning recess 20 on the lower end surface of the reverse extrusion blank 6 to ensure that the reverse extrusion blank 6 is centered with the lower mold core 7.

[0042] The molding die in the present invention also includes an upper pad and a lower pad 8. The lower end surface of the upper die base 1 is provided with an upper pad cavity, and the upper pad is placed in the upper pad cavity. The upper die pressure ring 10 is connected to the upper pad by bolts. The upper pad is used to support the upper die body, thereby preventing the upper die base 1 from being directly subjected to force. The upper end surface of the lower die base 9 is provided with a lower pad 8 cavity, and the lower pad 8 is arranged in the lower pad 8 cavity, and the back-extrusion cylinder 5 is connected to the lower pad 8 by bolts. The lower pad 8 is used to resist the extrusion force during the back extrusion of the upper die 3 and the upper die core 4, thereby preventing the lower die base 9 from being directly subjected to force.

[0043] The reverse extrusion forming die of the present invention further comprises an upper heating furnace 12 and a lower heating furnace 13, wherein the upper heating furnace 12 is connected to the upper die base 1, and the lower heating furnace 13 is connected to the lower die base 9. When the upper die 3 and the upper die core 4 reversely extrude and move downward to the lower stop position, the upper heating furnace 12 and the lower heating furnace 13 contact, and the upper heating furnace 12 and the lower heating furnace 13 enclose a closed space so as to heat the cylindrical member 14.

[0044] The isothermal reverse extrusion molding method of the powder high temperature alloy cylindrical part 14 includes:

[0045] Step 1: Preparation of fine-grained powder high-temperature alloy blanks

[0046] According to the outer diameter D0 of the cylindrical part 14, the outer diameter of the required powder high-temperature alloy fine-grained structure blank is determined as D0, and then the volume of the required blank is calculated according to the volume of the cylindrical part 14 + the process margin, and the height of the required powder high-temperature alloy fine-grained structure blank is calculated as H0 according to the equal volume principle. The high-temperature alloy powder is prepared into a fine-grained structure blank with a diameter of D0 and a height of H0 by using a jacket hot extrusion method or a jacket upsetting method, and the fine-grained structure is characterized by an average grain diameter of 2μm to 10μm;

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

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

[0049] Step 3: Back-extrusion billet 6 sand blowing

[0050] The entire surface of the reverse extrusion blank 6 is sandblasted by a sandblasting machine to remove the oil stains and other attachments on the surface, so that the surface is gray and rough.

[0051] Step 4: Apply lubricant

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

[0053] Step 5: Mold assembly and heating

[0054] Install the upper pad on the upper die base 1, assemble the flange of the upper die 3 on the inner ring of the upper die pressing ring 10, lock the upper die pressing ring 10 on the upper pad by bolts, and lock the upper heating furnace 12 on the upper die base 1 by bolts. Install the lower pad 8 on the lower die base 9, and lock the reverse extrusion cylinder 5 on the lower pad 8 by bolts. Set the lower die core 7 in the reverse extrusion cylinder 5, and the lower die core connection part passes through the lower pad 8 and the lower die base 9 in sequence. Lock the lower heating furnace 13 on the lower die base 9 by bolts. Place the assembled reverse extrusion forming mold on the workbench of the hydraulic press. The upper die base 1 is connected to the upper crossbeam of the hydraulic press, and the upper die core connection part is connected to the upper ejection mechanism of the hydraulic press. The lower die core connection 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℃, and the insulation time is 5~10h.

[0055] Step 6: Heating of reverse extrusion blank 6

[0056] The reverse extrusion billet 6 is placed in a special heating furnace for reverse extrusion billet for heating at a temperature of 1050°C to 1100°C. The holding time is calculated according to the following formula:

[0057] T=L×0.8min / mm, wherein: L is selected according to the smaller dimension of the diameter and height of the reverse extrusion billet 6.

[0058] Step 7: Transfer of reverse extrusion billet 6

[0059] After the reverse extrusion blank 6 is taken out of the furnace, the groove 16 on its upper end surface is filled with glass powder lubricant, but no glass powder lubricant is placed in the first positioning pit 17. Then the reverse extrusion blank 6 is placed in the reverse extrusion cylinder 5 at a temperature of 1050℃~1100℃, and is contacted and centered with the lower mold core 7. The upper mold 3 and the upper mold core 4 move downward, and stop when they are about to contact the reverse extrusion blank 6, and keep warm 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 extrusion blank 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 enclose a relatively closed space, thereby causing the glass powder lubricant in the groove 16 to melt into liquid.

[0060] Step 8: Anti-extrusion

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

[0062] Step 9: Demolding of the cylindrical part 14

[0063] When the reverse extrusion is completed, the upper mold core 4 first presses 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 to separate from the cylindrical part 14. Finally, the lower mold core 7 pushes the cylindrical part 14 upward to complete the demolding of the cylindrical part 14 and the reverse extrusion cylinder 5. The entire reverse extrusion process is completed.

[0064] Step 10: Slow cooling of the cylindrical part 14

[0065] The cylindrical part 14 obtained in step nine is taken to a drying area by a robot and covered with aluminum silicate fiber felt for slow cooling, with a cooling rate of ≤50°C / h.

[0066] In the description of the present invention, it should be noted that the terms "upper", "lower", "bottom", "horizontal", "center", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0067] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An isothermal reverse extrusion forming die for a powder high-temperature alloy cylindrical part, 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: An upper die pressing ring (10), the upper die pressing ring (10) is connected to the upper die seat (1), the upper die pressing ring (10) comprises an inner ring portion, the upper end surface of the inner ring portion is provided with a ball (11), the upper die (3) comprises a flange and an upper die body, the flange is adapted to fit in a cavity enclosed by the upper end surface of the inner ring portion and the lower end surface of the upper die seat (1), and the flange is placed on the ball (11), and the upper die body passes through the annular cavity of the inner ring portion and extends downward; An upper mold core (4), the upper mold core (4) comprises an upper mold core body and an upper mold core connecting part which are connected to each other, the upper mold body is provided with a mold core groove with an opening facing downward, the upper mold core body is adapted to be in the mold core groove, the upper mold (3) and the upper mold base (1) are correspondingly 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.

2. The isothermal reverse extrusion forming die for powder high temperature alloy cylindrical parts according to claim 1, characterized in that: The bottom end surface of the upper mold core body is provided with a first positioning boss (18) protruding downward, and the first positioning boss (18) is adapted to the first positioning recess (17) on the reverse extrusion blank (6).

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

4. The isothermal reverse extrusion forming die for powder high temperature alloy cylindrical parts according to claim 1, characterized in that: A ball groove is provided on the upper surface of the inner ring portion, the ball (11) is rollably arranged in the ball groove, and the ball (11) is a plurality of balls arranged along the ball groove.

5. The isothermal reverse extrusion forming die for powder high temperature alloy cylindrical parts according to claim 4, characterized in that: The ball groove is an annular groove, which is arranged around the center of the upper mold ring (10); or the ball groove is a linear groove extending radially along the inner ring portion, and there are multiple linear grooves, which are distributed radially.

6. The isothermal reverse extrusion forming die for powder high temperature alloy cylindrical parts according to claim 4, characterized in that: The upper die pressing 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 die seat (1) via bolts.

7. The isothermal reverse extrusion forming die for powder high temperature alloy cylindrical parts according to claim 2, characterized in that: It also includes a lower mold core (7), the lower mold core (7) includes a lower mold core body and a lower mold core connecting part, the lower mold core body is adapted to be inside the reverse extrusion cylinder (5), the upper end surface of the lower mold core body is in contact with the lower end surface of the reverse extrusion blank (6), and the lower mold base (9) is provided with a third channel for the lower mold core connecting part to pass through and move up and down, and the lower mold core connecting part is connected to the driving end of the third driving member.

8. The isothermal reverse extrusion forming die for powder high temperature alloy cylindrical parts according to claim 7, characterized in that: The upper end surface of the lower mold core body is provided with a second positioning boss (19) protruding upward, and the lower end surface of the reverse extrusion blank (6) is provided with a second positioning recess (20) adapted to the second positioning boss (19).

9. 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), wherein the lower end surface of the upper die seat (1) is provided with an upper pad cavity adapted to the upper pad (2), and the upper die pressing ring (10) is connected to the upper pad (2) by bolts; the upper end surface of the lower die seat (9) is provided with a lower pad cavity adapted to the lower pad (8), and the reverse extrusion cylinder (5) is connected to the lower pad (8) by bolts.

10. 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 heating furnace (12) and a lower heating furnace (13), wherein 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), and when the upper mold (3) moves down to the lower stop position, the upper heating furnace (12) and the lower heating furnace (13) are in contact.

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