A method for rotary extrusion of non-anisotropic high-performance slab

Abstract

The present invention discloses a non-anisotropic high-performance slab rotary extrusion forming method, comprising an upper die assembly, a lower die assembly, and a rotating seat assembly; the upper die assembly comprises an upper die plate and a punch connected to the lower part of the upper die plate, and the lower end surface of the punch is provided with a cross-shaped groove; the lower die assembly comprises a split insert, a fixed platform, a support seat, and a concave die connected to the upper part of the support seat, the concave die is provided with an extrusion cavity, a fixed platform with a through hole in the middle is fixed to the bottom of the extrusion cavity, a split insert is placed above the fixed platform, the upper surface edge of the split insert forms a plurality of special-shaped grooves, the middle part of the upper surface forms a hollow channel, and the upper surface edge is inclined and concave to the middle part of the upper surface; the support seat is provided with an extrusion cavity, and a correction plate is provided at the top of the extrusion cavity, and a plate-shaped hole is provided in the middle of the correction plate; the lower part of the support seat is connected to the rotating seat assembly. The present invention increases the single-pass strain amount, improves the accumulated strain, and enhances the grain refinement effect of the deformed billet, so as to obtain a high-performance ultra-long slab at one time.

Description

Technical Field

[0001] The invention belongs to the technical field of metal plastic deformation, and in particular refers to a non-anisotropic high-performance plate blank rotary extrusion forming method. Background Art

[0002] With the rapid development of aerospace, automobile and national defense industries and the rapid consumption of the earth's oil resources, the demand for high-strength, tough and lightweight metal components is increasing. As an important raw material for metal components in the billet making stage, the performance of the slab itself is of great significance for the subsequent processing of metal components. The aspect ratio of the ultra-long slab is about 10-12, and the width-to-thickness ratio is about 4-5. The general slab plastic forming process is mainly rolling. The rolling process achieves a smaller ingot cross-section through the compression of the roller, which often requires multiple deformations, consumes a lot of energy, and shows a large performance difference between the rolling direction and the non-rolling direction. In the invention patent with application number CN201610843696.3, Zhang Zhimin et al. proposed a rotary extrusion forming method for hollow billets to form large aspect ratio inner ring ribs, which can meet the mechanical properties of components in all directions. The rotary extrusion process can significantly reduce the anisotropy of components and can be used to form cylindrical parts, cup-shaped parts and conical parts. However, there is no forming method for rotary extruded slabs on the market. Summary of the invention

[0003] The purpose of the present invention is to provide a non-anisotropic high-performance slab rotary extrusion forming method, increase the single-pass strain, improve the cumulative strain, enhance the grain refinement effect of the deformed billet, and obtain a high-performance ultra-long slab in one deformation.

[0004] To achieve the above object, the solution of the present invention is: a method for rotary extrusion of a non-anisotropic high-performance slab, comprising the following steps:

[0005] S1 Preparation before forming: Assemble the slab rotary extrusion forming die, which includes an upper die assembly, a lower die assembly, and a rotating seat assembly; the upper die assembly includes an upper die plate and a punch connected to the lower part of the upper die plate, and the lower end surface of the punch is provided with a cross-shaped groove; the lower die assembly includes a split insert, a fixed platform, a support seat, and a die connected to the upper part of the support seat, and the die is provided with an extrusion cavity for the fixed platform, the split insert, and the punch to be placed in cooperation, the fixed platform is fixed at the bottom of the extrusion cavity, and the middle of the fixed platform is provided with a cross-shaped groove; A through hole is provided, and a split insert is placed above the fixed platform. The split insert is composed of a left insert and a right insert. A plurality of special-shaped grooves are formed on the edge of the upper surface of the split insert, and a hollow channel is formed in the middle of the upper surface, and the edge of the upper surface is inclined and concave to the middle of the upper surface; a through-length extrusion cavity is coaxially provided below the extrusion cavity on the support seat, and a correction plate is provided on the top of the extrusion cavity, and a plate-shaped hole connected with the hollow channel and the through hole is provided in the middle of the correction plate, so that the slab can be suspended and extruded into the extrusion cavity; the lower part of the support seat is connected to the rotating seat assembly;

[0006] Then, the split insert and the punch are heated and evenly coated with an oil-based graphite lubricant, the blank is heated and placed on the split insert, the blank is evenly coated with an oil-based graphite lubricant, and then the blank and the split insert are placed in the extrusion cavity together;

[0007] S2 forming process: the punch moves vertically downward, exerting thrust on the blank so that the punch is in close contact with the surface of the blank, and the split insert installed on the fixed table is in a mold-closing state;

[0008] The S3 punch is pressed downward so that the cross groove on the punch and the special-shaped groove of the split insert are fully filled;

[0009] The S4 rotating seat assembly rotates, thereby driving the die and the split insert to rotate, realizing the rotation of the blank around its own central axis. At this time, the punch is fed synchronously. Due to the correction effect of the correction plate, the bending of the blank is corrected when it passes through the correction plate;

[0010] S5: The punch is fed to the specified position. At this time, except for part of the material head embedded in the split insert, the remaining material has been completely squeezed out;

[0011] S6 Forming is completed: the punch moves upward to eject the split insert together with the formed slab, and cuts off part of the slab head that was initially extruded as the final product, thus completing a rotary extrusion slab forming.

[0012] Furthermore, the upper surface and the lower surface of the die are respectively provided with a plurality of upper hanging holes and a lower hanging holes for taking out the formed slab, the left insert and the right insert are of symmetrical structure, the left insert is divided into two parts, the upper half of the left insert is a transition section, the lower half of the left insert is a straight section, the transition section is a smooth curved surface, and a plurality of grooves are provided on the curved surface, in step S6, the punch moves upward, and at the same time, the die together with the blank and the split insert are lifted out through the upper hanging holes on the upper surface of the die, after turning it over as a whole, it is lifted by the lower hanging holes on the lower surface of the die, and the split insert is ejected together with the formed slab by strong knocking, and then the left insert and the right insert are separated and the formed slab is taken out, and the part of the slab head initially extruded is cut off as the final product, thereby completing a rotary extrusion slab forming.

[0013] Furthermore, the fixing platform is symmetrically provided with two ejection holes along the through hole. In step S6, an ejector rod is placed into the ejection hole to eject the split insert together with the formed slab.

[0014] After adopting the above scheme, the gain effect of the present invention is that: the present invention can achieve uniform equivalent strain of super-long slabs, and is specially designed to add split inserts and correction plates. The special-shaped grooves on the upper surface of the split inserts and the cross-shaped grooves of the punches are rotated to improve the grain refinement of the billet during extrusion, and the cumulative strain is improved, so that the formed super-long slabs have excellent performance, and the comprehensive mechanical properties are uniform and greatly improved, avoiding the occurrence of cracking and fracture; the split inserts and correction plates are easy to maintain, and only the split inserts and correction plates need to be replaced to achieve the formation of slabs with different extrusion ratios and shapes and sizes. In addition, the full-length extrusion cavity ensures that the slabs are suspended under the action of gravity to form super-long slabs with high straightness, and the comprehensive mechanical properties along the length of the slabs are uniform and stable, eliminating anisotropy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0016] Figure 2 It is a front view structural schematic diagram of the present invention;

[0017] Figure 3 It is a half-section structure schematic diagram of the present invention;

[0018] Figure 4 It is a structural schematic diagram of the upper template of the present invention;

[0019] Figure 5 It is a structural schematic diagram of the upper part of the male mold of the present invention;

[0020] Figure 6 It is a schematic diagram of the structure of the key of the present invention;

[0021] Figure 7 It is a structural schematic diagram of the upper mold assembly of the present invention;

[0022] Figure 8 It is a structural schematic diagram of the male mold of the present invention;

[0023] Fig. 9 is a dimensional diagram of the cross-shaped groove of the present invention (an enlarged diagram of the cross-shaped groove);

[0024] Fig.10 It is a structural schematic diagram of the lower part of the concave mold of the present invention;

[0025] Fig.11 It is a schematic diagram of the top view of the split insert of the present invention;

[0026] Fig.12 yes Fig.11 Schematic cross-sectional view of AA in the figure;

[0027] Fig.13 yes Fig.11 A schematic cross-sectional view of the middle BB;

[0028] Fig.14 It is a structural schematic diagram of the left insert of the present invention;

[0029] Fig.15 It is a three-dimensional structural schematic diagram of the split insert of the present invention;

[0030] Fig.16 It is a schematic diagram of the top view of the structure of the concave mold and the fixing table in the assembled state of the present invention;

[0031] Fig.17 It is a structural schematic diagram of the support seat of the present invention;

[0032] Fig.18 It is a structural schematic diagram of the correction plate of the present invention;

[0033] Fig.19 It is a structural schematic diagram of the present invention in which the punch is placed and the blank is placed on the split insert;

[0034] Fig. 20 It is a schematic diagram showing that the special-shaped groove on the punch of the present invention is just fully filled;

[0035] Fig.21 It is a schematic diagram of the blank just passing through the correction plate during the rotary extrusion process of the present invention;

[0036] Fig. 22 A schematic diagram of the rotary extrusion completed in the present invention;

[0037] Fig.23 The stress distribution at the large groove of the slab after rotary extrusion of the present invention is completed;

[0038] Fig.24 The velocity field distribution of the slab after rotary extrusion of the present invention is completed;

[0039] Fig.25 The local velocity field distribution of the slab after the rotary extrusion of the present invention is completed;

[0040] Fig.26 It is the equivalent strain distribution of the slab after the rotary extrusion of the present invention.

[0041] Description of labels:

[0042] 1. Upper die assembly; 11. Upper die plate; 111. Upper bolt hole; 112. Upper keyway; 12. Punch; 121. Lower bolt hole; 122. Lower keyway; 13. Cross groove; 14. Key; 2. Lower die assembly; 21. Split insert; 211. Left insert; 212. Right insert; 213. Special-shaped groove; 2131. Small groove; 2132. Large groove; 214. Hollow channel; 215. Oblique rib groove; 22. Fixing platform; 221. Through hole; 222. Ejection hole; 23. Support Support seat; 231, straight hole; 232, extrusion cavity; 233, semicircular groove; 234, flange; 235, bolt hole; 236, groove; 24, die; 241, extrusion cavity; 242, boss; 243, oblique rib; 244, upper hanging hole; 245, lower hanging hole; 25, correction plate; 251, plate hole; 252; vertical rib; 3, rotating seat assembly; 31, rotating seat; 311, small bolt hole; 312, large bolt hole; 313, upper long groove; 314, lower long groove; 4, blank. DETAILED DESCRIPTION

[0043] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] The present invention relates to a slab rotary extrusion forming die, such as Figure 1 As shown, it includes an upper mold assembly 1, a lower mold assembly 2, and a rotating seat assembly 3.

[0045] The upper mold assembly 1 includes an upper mold plate 11 and a male mold 12 connected to the lower part of the upper mold plate 11. Figure 4 The upper mold plate 11 is a schematic diagram of the structure of the upper mold plate 11, which is fixedly installed on the lower part of the extruder (not shown in the figure). The upper mold plate 11 is provided with a plurality of upper bolt holes 111 and upper key grooves 112. The upper part of the punch 12 is provided with a plurality of lower bolt holes 121 and lower key grooves 122. The upper key grooves 112 and the lower key grooves 122 are connected by the following Figure 6 The key 14 shown is connected, and half of the key 14 is embedded in the upper key groove 112 and the lower key groove 122. The upper bolt hole 111 and the lower bolt hole 121 are connected by bolts, and the extruder drives the upper mold plate 11 and the punch 12 to perform axial feeding.

[0046] The upper mold assembly 1 after connection is as follows Figure 7 As shown, the lower end face of the punch 12 is provided with a cross-shaped groove 13 distributed vertically in the radial direction. The key dimensions of the cross-shaped groove 13 include the groove width, the groove height h, the groove slope α, and the upper fillet R1 and the lower fillet R2. The groove width l1 = 45 mm, the groove height h1 = 40 mm, the groove slope α = 45°, the upper fillet R1 = 9 mm, and the lower fillet R2 = 11 mm. In this case, by setting the parameters of the groove width l1, height h1 and slope α of the cross-shaped groove 13, it is possible to ensure that the ribs at the cross-shaped groove 13 are equivalent to the strength of the reinforcing ribs, so that they will not be forcefully ground flat by the blank 4, and can be embedded in the blank, so that the upper part of the blank only undergoes vertical feeding with the punch 12 without rotating.

[0047] The lower die assembly 2 includes a split insert 21, a fixed platform 22, a support seat 23, and a die 24 connected to the upper part of the support seat 23. The die 24 is provided with an extrusion cavity 241 for the fixed platform 22, the split insert 21, and the punch 12 to be placed in cooperation. The fixed platform 22 is fixed to the bottom of the extrusion cavity 241. A through hole 221 is provided in the middle of the fixed platform 22, and two ejection holes 222 are symmetrically provided along the through hole 221. The split insert 21 is placed above the fixed platform 22. The split insert 21 is composed of a left insert 211 and a right insert 212. A plurality of special-shaped grooves 213 are formed on the edge of the upper surface of the split insert 21, a hollow channel 214 is formed in the middle of the upper surface, and the edge of the upper surface is inclined and recessed to the middle of the upper surface; the support seat 23 is coaxially provided with a full-length extrusion cavity 232 below the extrusion cavity 241 and a correction plate 25 is arranged on the top of the extrusion cavity 232, and a plate-shaped hole 251 connected with the hollow channel 214 and the through hole 221 is opened in the middle of the correction plate 25, so that the slab can be suspended and extruded into the extrusion cavity 232; the lower part of the support seat 23 is connected to the rotating seat assembly 3.

[0048] like Fig.10 As shown, the lower surface of the die 24 has four bosses 242 evenly distributed along the circumference, and the bosses 242 match the straight holes 231 opened on the top of the support seat 23. The inner surface of the extrusion cavity 241 of the die 24 is provided with oblique ribs 243 for the split insert 21 to move downward and be inserted, and the inclination of the oblique ribs 243 is 5 to 7 degrees. The outer surface of the split insert 21 is provided with oblique rib grooves 215, and the shape of the oblique rib grooves 215 is consistent with the shape of the oblique ribs 243.

[0049] In order to facilitate the removal of the formed slab, the split insert 21 is as follows Fig.15 As shown, a split design is adopted, which is composed of a left insert 211 and a right insert 212. After the forming is completed, the split insert 21 and the slab are ejected as a whole, and then the split insert 21 is separated to obtain a formed slab; the left insert 211 and the right insert 212 are symmetrical structures, such as Fig.14 As shown, the left insert 211 is divided into two parts, the upper half of the left insert 211 is a transition section, and the lower half of the left insert 211 is a straight section. The height h1 of the transition section is 70 mm, and the height h2 of the straight section is 20 mm. The entrance position of the transition section is a circle with a diameter of 180 mm, and the exit position is a long shape with a length of H = 100 mm and a width of D = 25 mm. A smooth curved surface is used for transition between the transition section and the straight section, and a plurality of grooves are provided on the curved surface, such as Figure 12-13 As shown, the plurality of grooves include two small grooves 2131 and two large grooves 2132. The key parameters of the large groove 2132 include the first small pit depth d1 and width t1, the small protrusion height d2 and width t2, and the horizontal distance of the small protrusion from the outlet position. The first small pit depth d1 = 7mm, the small protrusion height d2 = 9mm, the first small pit width t1 = 10mm, the small protrusion width t2 = 16mm, and the horizontal distance of the small protrusion from the outlet position is 31mm. The key parameters of the small groove 2131 include the second small pit depth d3 and width t3, and the horizontal distance of the second small pit from the outlet position. The second small pit depth d3 = 4mm, the second small pit width t3 = 7mm, and the horizontal distance of the second small pit from the outlet position is 16mm. Specifically, the special-shaped groove 213 in this case includes a large groove 2132 and a small groove 2131. The split insert is equivalent to an extrusion cylinder. On the one hand, by adjusting the rotation speed of the die, the rotation strain of the blank can be controlled, the microstructure of the material can be improved, and the overall performance is greatly improved; on the other hand, the strain of each position of the slab after rotary extrusion is regulated to a certain extent, so that the strain difference between the edge and the middle of the slab after final forming is not large, and the anisotropy of the alloy is greatly improved. The groove setting on the curved surface of the split insert 21 can, on the one hand, clamp the blank, so that the lower part of the blank rotates with the split insert 21, and only the middle part undergoes rotational deformation. On the other hand, the strain state of the slab after forming can be regulated, so that the metal flow rate of each part of the blank during the rotary extrusion process is basically the same, the equivalent strain of each part is relatively uniform, and the overall performance is greatly improved.

[0050] Since the length of the formed slab is very long and the straightness of the slab is high, considering the problem of difficulty in removing the slab after forming, if a conventional ejector rod structure is adopted, due to the limitation of the length of the slab, the ejector rod should be a slender rod with a large aspect ratio, which is very easy to bend or even break when subjected to a large extrusion pressure. For this reason, the present case adopts the form of an ejector hole 222 provided on the fixed table 22. After the rotary extrusion is completed, the die 24, the split insert 21 and the formed slab are hoisted out and turned over; specifically, the diameter of the ejector hole 222 is 40 mm, and the lateral distance from the through hole 221 is 20 mm. The length and width of the through hole 221 are both 10 to 15 mm longer than the length H and width D of the outlet position of the straight section.

[0051] In order to realize the flipping and material removal of the die 24, the split insert 21 and the formed slab, a plurality of upper hanging holes 244 and lower hanging holes 245 are opened on the upper and lower surfaces of the die 24 in this case. When removing the material, the ejector pin is placed in the ejection hole 222, and the split insert 21 and the formed slab are ejected together by the knocking of the ejector pin. Since the oblique rib 243 and the oblique rib groove 215 of the split insert 21 have a certain draft angle, it is easier to demold, which is conducive to the large-scale rotary extrusion production of slabs.

[0052] The rotating seat assembly 3 includes a rotating seat 31 and a rotating device (not shown in the figure). The connection method between the rotating seat 31 and the rotating device is the same as the connection method between the upper mold plate 11 and the punch 12, that is, the rotating seat 31 is provided with a plurality of large bolt holes 312 and a lower long groove 314, and the rotating device is provided with a plurality of bolt holes and an upper key groove correspondingly, and the lower long groove 314 and the upper key groove are connected by a Figure 6 The key 14 shown is connected, and half of the key 14 is embedded in the lower long groove 314 and the upper key groove. The rotating seat 31 is connected to the rotating device through the key 14 and a plurality of fastening bolts, and the rotating device drives the rotating table to rotate around its own central axis.

[0053] Fig.17The structure diagram of the support seat 23 is shown. The support seat 23 is a circular ring entity with a flange 234 and a height of 1200 mm. The edge of the flange 234 is provided with bolt holes 235 of the same size at a position corresponding to the rotating seat 31, and a groove 236 is provided at the bottom of the flange 234. The connection method between the support seat 23 and the rotating seat 31 is the same as the connection method between the upper template 11 and the punch 12, that is, the rotating seat 31 is provided with a plurality of small bolt holes 311 and an upper long groove 313, and half of the key 14 is embedded in the upper long groove 313 and the groove 236. The support seat 23 is detachably fixed on the rotating seat 31 by the key 14 and the fastening bolts, and the rotating seat 31 drives the support seat 23 to rotate around its own central axis, thereby rotating and extruding the blank. The slab is formed by rotary positive extrusion. Compared with traditional positive extrusion, the shear deformation during rotation is greatly enhanced, so that the performance is greatly improved and the anisotropy is greatly reduced. At the same time, the rotation device and the rotating seat 31, the rotating seat 31 and the supporting seat 23, and the punch 12 and the upper mold plate 11 are connected through keys to withstand the shear stress generated during rotation, and the bolts are only used to locate the mold position.

[0054] In addition, a semicircular groove 233 is provided on the top of the support seat 23 for the correction plate 25 to be placed therein, and a plurality of vertical ribs 252 are provided around the correction plate 25 to be clamped in the semicircular groove 233. The length and width of the plate-shaped hole 251 in the middle of the correction plate 25 are 0.5 mm longer than the length H and width D of the outlet position of the straight section on one side.

[0055] In this case, by designing a split insert 21 and a correction plate 25 with different extrusion sizes, there is no need to replace the remaining forming devices. Only the split insert 21 and the correction plate 25 need to be replaced to achieve slab forming with different extrusion ratios.

[0056] In addition, the equivalent strain in the high-performance slab forming process is controllable. Since the stroke is fixed, the grains can be refined by increasing the torsional strain by adjusting the rotation speed, and the performance is greatly improved. This process is completed in the extrusion cavity with a short stroke and does not require multiple deformation passes.

[0057] The present invention provides a non-anisotropic high-performance slab rotary extrusion forming method, comprising the following steps:

[0058] S1: Preparation before forming: Assemble the rotating seat 31 assembly and the support seat 23 according to the above-mentioned installation relationship, then put the correction plate 25 into the semicircular groove 233, then install the die 24 on the support seat 23, heat the split insert 21 and the punch 12, evenly apply oil-based graphite lubricant, heat the blank 4 and put it on the split insert 21, and evenly apply oil-based graphite lubricant on the blank 4, and then put the blank 4 and the split insert 21 into the extrusion cavity 241 together;

[0059] S2: Forming process: Fig.19 As shown, the extruder drives the punch 12 to move vertically downward, exerting a thrust on the blank 4 so that it is in close contact with the surface of the blank 4, and the split insert 21 mounted on the fixed platform 22 is in a mold-closing state;

[0060] S3: Fig. 20 As shown, the punch 12 is extruded downward, the extrusion distance is 25 mm, and the extrusion speed is 0.6 mm / s, so that the cross groove on the punch 12 and the small groove and the large groove of the split insert 21 are filled fully;

[0061] S4: Fig.21 As shown, the rotating device (not shown in the figure) is started, which can drive the rotating seat 31 and the supporting seat 23 to rotate, thereby driving the die 24 and the split insert 21 to rotate, and realizing the rotation of the blank 4 around its own central axis. The rotation speed is 0.0667rad / s. At this time, the punch 12 is fed synchronously, and the extrusion speed is 1mm / s. Due to the correction effect of the correction plate 25, the curvature of the blank 4 is corrected when the blank 4 passes through the correction plate 25;

[0062] S5: Fig. 22 As shown, the punch 12 is fed to the specified position, at which point, except for a portion of the material head being embedded in the split insert 21, the remaining material has been completely extruded;

[0063] S6: Forming is completed: the punch 12 moves upward together with the extruder (not shown in the figure), and at the same time, the die 24 together with the blank 4 and the split insert 21 are lifted out through the upper lifting hole 244 on the upper surface of the die 24, and after being completely turned over, it is lifted by the lower lifting hole 245 on the lower surface of the die 24, and the ejector rod is placed in the ejection hole 222. By strong knocking, the split insert 21 is ejected together with the formed slab, and then the left insert 211 and the right insert 212 are separated and the formed slab is taken out, and the initial extruded part of the slab 4 is cut off as the final product, thereby completing a rotary extrusion slab forming.

[0064] The specific dimensions of the above process were brought into the Deform-3D finite element software to conduct a simulation analysis of the ultra-long high-performance slab rotary extrusion, which further verified that the present invention can achieve more uniform equivalent strain. Fig.23 As shown in the figure, the stress in the large groove of the slab after rotary extrusion can be regulated, avoiding the appearance of "stress dead zone"; Fig.24 and 25 As shown in the figure, the velocity fields at the edge and middle of the slab after rotary extrusion, as well as the upper, middle and lower parts, are relatively uniform, indicating good forming. Fig.26As shown in the figure, the equivalent strain of the slab after rotary extrusion is relatively uniform at the edge and middle, and except for the initial head, the strain of the upper and middle parts is relatively uniform, and the average equivalent strain reaches 5.2, achieving a large plastic deformation. Different specifications of slabs can be prepared by simply replacing the split insert and the correction plate, reducing the processing cost.

[0065] The above description is only a preferred embodiment of the present invention and is not a limitation on the design of this case. Any equivalent changes made based on the design key of this case shall fall within the protection scope of this case.

Claims

1. A method for rotary extrusion of a non-anisotropic high-performance slab, characterized in that: The following steps are involved: S1 Preparation before forming: Assemble the slab rotary extrusion forming die, which includes an upper die assembly, a lower die assembly, and a rotating seat assembly; the upper die assembly includes an upper die plate and a punch connected to the lower part of the upper die plate, and the lower end surface of the punch is provided with a cross-shaped groove; the lower die assembly includes a split insert, a fixed platform, a support seat, and a concave die connected to the upper part of the support seat, and the concave die is provided with an extrusion cavity for the fixed platform, the split insert, and the punch to be matched and placed, the fixed platform is fixed at the bottom of the extrusion cavity, and a through hole is provided in the middle of the fixed platform, and a fixed A split insert is placed above the table, the split insert is composed of a left insert and a right insert, a plurality of special-shaped grooves are formed on the edge of the upper surface of the split insert, a hollow channel is formed in the middle of the upper surface, and the edge of the upper surface is inclined and concave to the middle of the upper surface, and the special-shaped grooves include large grooves and small grooves; the support seat is coaxially provided with a full-length extrusion cavity below the extrusion cavity and a correction plate is arranged on the top of the extrusion cavity, and a plate-shaped hole connected with the hollow channel and the through hole is opened in the middle of the correction plate, so that the slab can be suspended and extruded into the extrusion cavity; the lower part of the support seat is connected to the rotating seat assembly; Then, the split insert and the punch are heated and evenly coated with an oil-based graphite lubricant, the blank is heated and placed on the split insert, the blank is evenly coated with an oil-based graphite lubricant, and then the blank and the split insert are placed in the extrusion cavity together; The cross-shaped groove includes a groove width l1, a groove height h1, a groove slope α, an upper fillet R1 and a lower fillet R2, wherein the groove width l1=45 mm, the groove height h1=40 mm, the groove slope α=45°, the upper fillet R1=9 mm, and the lower fillet R2=11 mm; The left insert and the right insert are symmetrical structures, the upper half of the left insert is a transition section, and the lower half of the left insert is a straight section. The height of the transition section is 70 mm, and the height of the straight section is 20 mm. The entrance position of the transition section is a circle with a diameter of 180 mm, and the exit position is a long shape with a length of H=100 mm and a width of D=25 mm. The large groove includes a first small pit depth d1 and width t1, a small protrusion height d2 and width t2, and a horizontal distance between the small protrusion and the outlet position, the first small pit depth d1=7mm, the small protrusion height d2=9mm, the first small pit width t1=10mm, the small protrusion width t2=16mm, and the horizontal distance between the small protrusion and the outlet position is 31mm; The small groove includes a second small pit depth d3 and a width t3, and a horizontal distance between the second small pit and the outlet position, the second small pit depth d3=4mm, the second small pit width t3=7mm, and the horizontal distance between the second small pit and the outlet position is 16mm; S2 forming process: the punch moves vertically downward, exerting thrust on the blank so that the punch is in close contact with the surface of the blank, and the split insert installed on the fixed table is in a mold-closed state; The S3 punch is pressed downward so that the cross-shaped groove on the punch and the special-shaped groove on the split insert are fully filled; The S4 rotating seat assembly rotates, thereby driving the die and the split insert to rotate, realizing the rotation of the blank around its own central axis. At this time, the punch is fed synchronously. Due to the correction effect of the correction plate, the bending of the blank is corrected when it passes through the correction plate; S5: The punch is fed to the specified position. At this time, except for part of the material head embedded in the split insert, the remaining material has been completely squeezed out; S6 Forming is completed: the punch moves upward to eject the split insert together with the formed slab, and cuts off part of the slab head that was initially extruded as the final product, thus completing a rotary extrusion slab forming.

2. A method for rotary extrusion of a non-anisotropic high-performance slab as claimed in claim 1, characterized in that: The upper surface and the lower surface of the die are respectively provided with a plurality of upper hanging holes and a lower hanging holes for taking out the formed slab. The left insert and the right insert are symmetrical structures. The left insert is divided into two parts. The upper half of the left insert is a transition section, and the lower half of the left insert is a straight section. The transition section is a smooth curved surface, and a plurality of grooves are opened on the curved surface. In step S6, the punch moves upward, and at the same time, the die is lifted out together with the blank and the split insert through the upper hanging holes on the upper surface of the die. After turning it over, it is lifted by the lower hanging holes on the lower surface of the die. The split insert is ejected together with the formed slab by strong knocking, and then the left insert and the right insert are separated and the formed slab is taken out, and the part of the slab head initially extruded is cut off as the final product, thereby completing a rotary extrusion slab forming.

3. A method for rotary extrusion of a non-anisotropic high-performance slab as claimed in claim 1 or 2, characterized in that: The fixing platform is symmetrically provided with two ejection holes along the through hole. In step S6, an ejector rod is placed into the ejection hole to eject the split insert together with the formed slab.

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