Radial-shaft two-way extrusion forming method for disc-shaft integrated piece with abrupt-change section and large length-diameter ratio

Abstract

The invention relates to the field of forming methods of disc-shaft integrated parts with abrupt sections and large length-diameter ratios, in particular to a radial-shaft two-way extrusion forming method for disc-shaft integrated parts with abrupt sections and large length-diameter ratios. An extrusion rod, an extrusion cylinder and a disc forming die are preheated, coated with a lubricant and then mounted at fixed positions of a press; after the blank is heated and coated with a lubricant, the blank is transferred into an extrusion area, and an extrusion pad is placed on the blank to wait for extrusion; the extrusion rod moves towards the disc forming die along with the pressing machine moving cross beam, and radial-axis two-way combined extrusion forming is completed; and after extrusion is completed, the extrusion rod and the extrusion container move reversely, forging demolding is completed, and the disc-shaft integrated piece with the abrupt-change section and the large length-diameter ratio is obtained. According to the method, the optimized extrusion blank and the one-heating-number radial-axis two-way extrusion forming super-long shaft forge piece are adopted, efficiency is high, energy consumption is low, size precision is high, and performance consistency is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of forming methods for disc-shaft integrated pieces with large length-diameter ratio and cross-section mutation, in particular to a disc-shaft bidirectional extrusion forming method for disc-shaft integrated pieces with large length-diameter ratio and cross-section mutation. BACKGROUND

[0002] The disc-shaft integrated piece with large length-diameter ratio and cross-section mutation is a kind of forged piece different from ordinary pipe, cylinder and ring forgings, which is formed integrally with a disc and a shaft. The typical structural feature is large length and large diameter ratio of the disc to the shaft. Therefore, the forming process has problems such as required forming in multiple heating times, large equipment stroke, high difficulty in microstructure control, and difficulty in demolding after forming. The present application can be applied to the forming of disc-shaft integrated forgings, blade forging blanking and high-quality bolt forging.

[0003] The free forging / positive extrusion forming rod part + local upsetting forming head part is the closest prior art to the present application at the present stage. However, the prior art is to complete free forging length reduction or positive extrusion first, and then perform local upsetting deformation. The two deformation processes are implemented on different devices. This forming method divides the total deformation into two steps. Moreover, the free forging process has problems such as multiple heating times, low dimensional accuracy, large machining allowance, long production cycle, easy performance difference between different parts of the disc-shaft integrated forging, coarse microstructure in the critical deformation zone, and the like. The positive extrusion forming requires a high equipment stroke, about 3 times the length of the forging, and puts forward higher requirements for the stability and precision of the equipment operation. The local upsetting process involves local heating, which easily causes the forging to have a significant heat-affected zone, thereby causing differences in microstructure and performance. SUMMARY

[0004] In order to solve the above problems, the present application provides a disc-shaft bidirectional extrusion forming method for disc-shaft integrated pieces with large length-diameter ratio and cross-section mutation, which is formed in one heating time, eliminates the critical deformation zone, effectively controls the grain size, greatly reduces the requirement for the equipment stroke, reduces the heating times, shortens the production process, improves the production efficiency of the ultra-long shaft forging, the dimensional accuracy and the quality consistency.

[0005] The disc-shaft bidirectional extrusion forming method for disc-shaft integrated pieces with large length-diameter ratio and cross-section mutation provided by the present application comprises the following steps: Step 1: forging design, the ratio of the center thickness to the edge thickness of the disc part of the disc-shaft integrated piece with large length-diameter ratio and cross-section mutation is 1.5-3; The ratio of the disc diameter to the shaft diameter of the disc-shaft integrated piece with large length-diameter ratio and cross-section mutation is not less than 2; Step 2: the extrusion rod, the extrusion cylinder and the disc forming die are preheated, coated with a lubricant and then installed at the fixed position of the press; The preheating temperature of the extrusion rod, the extrusion cylinder and the disc forming die is 200-300℃, and the extrusion rod and the extrusion cylinder are hollow; Step 3: After the blank is heated and coated with lubricant, it is transferred to the extrusion area, which includes a disc forming area and a shaft forming area that are interconnected; The disc forming area is the hollow area of the extrusion cylinder and the area surrounded by the disc forming die at one end thereof, which is located at the bottom of the extrusion cylinder; The shaft forming area is formed by the hollow area of the extrusion cylinder and the hollow area of the extrusion rod, with the extrusion rod located directly above the blank; Wherein, the diameter of the blank D = (0.6~0.8) × (D1+D2); D1 is the diameter of the disc part of the disc-shaft integrated piece with a large length-diameter ratio of cross-section mutation, and D2 is the diameter of the shaft part of the disc-shaft integrated piece with a large length-diameter ratio of cross-section mutation; Step 4: Place the extrusion pad on the blank and wait for the extrusion to start; Step 5: Start extrusion, the extrusion rod moves with the press moving beam towards the disc forming die, completing the radial-axial two-way composite extrusion forming; Step 6: After extrusion is completed, the extrusion rod and the extrusion cylinder move in the opposite direction, completing the knockout of the forging, i.e. obtaining the disc-shaft integrated piece with a large length-diameter ratio of cross-section mutation.

[0006] A radial-axial two-way extrusion forming method for a disc-shaft integrated piece with a large length-diameter ratio of cross-section mutation, comprising the following steps: Step 1: Forging design, the ratio of the center thickness to the edge thickness of the disc part of the disc-shaft integrated piece with a large length-diameter ratio of cross-section mutation is 1.5-3; The ratio of the diameter of the disc part to the outer diameter of the shaft part of the disc-shaft integrated piece with a large length-diameter ratio of cross-section mutation is not less than 2; Step 2: The extrusion rod, the extrusion cylinder, and the disc forming die are preheated and coated with lubricant before being installed at the fixed position of the press; the disc forming die includes a disc forming upper die and a disc forming lower die arranged oppositely; The preheating temperature of the extrusion rod, the extrusion cylinder, and the disc forming die is 200~300℃, and the extrusion cylinder is hollow; Step 3: After the blank is heated and coated with lubricant, it is transferred to the extrusion area, which includes a disc forming area and a shaft forming area that are interconnected; The disc forming area is the hollow area of the extrusion cylinder between the disc forming upper die and the disc forming lower die, the disc forming upper die is located above the blank, the disc forming upper die is located in the hollow area of the extrusion cylinder and matches the inner diameter of the extrusion cylinder; the disc forming lower die is below the extrusion cylinder; The shaft forming area is the area between the disc forming upper die, the disc forming lower die, and the extrusion rod; Wherein, the outer diameter of the blank D = (0.6~0.8) × (D1+D2); the inner diameter of the blank is the inner diameter of the shaft part of the disc-shaft integrated piece with a large length-diameter ratio of cross-section mutation; D1 is the diameter of the disc part of the cross-section mutation large aspect ratio disc-shaft integrated piece, and D2 is the diameter of the shaft part of the cross-section mutation large aspect ratio disc-shaft integrated piece; Step 4: placing the extrusion pad on the blank, and waiting for the extrusion to start; Step 5: starting extrusion, the extrusion rod moves with the press moving beam, and drives the disc forming upper die to move towards the disc forming lower die, to complete the radial-axial two-way composite extrusion forming; Step 6: after the extrusion is completed, the extrusion rod, the disc forming upper die and the extrusion cylinder are reversely moved, to complete the forging demolding, and the cross-section mutation large aspect ratio disc-shaft integrated piece is obtained.

[0007] Preferably, the disc forming lower die is provided with a shaft part protruding hole of the cross-section mutation large aspect ratio disc-shaft integrated piece at the center.

[0008] Preferably, the extrusion speed is 20-500 mm / s.

[0009] Preferably, the inner diameter of the extrusion cylinder is the same as the outer diameter of the blank.

[0010] Preferably, the extrusion pad is a lubricating glass powder prepared extrusion pad.

[0011] Preferably, the blank is a titanium alloy blank or a nickel-based alloy blank.

[0012] The extrusion blank and the one-time radial-axial two-way extrusion forming super-long shaft forging are adopted in the application, and the efficiency is high, the energy consumption is low, the size precision is high and the performance consistency is good.

[0013] The hollow extrusion rod reverse extrusion forming is adopted in the application, the requirement for equipment stroke is greatly reduced, and the equipment manufacturing cost and product production cost are reduced.

[0014] The forging is one-time formed in the application, the production process control risk is reduced, and the product batch stability is improved.

[0015] The one-time forming is adopted in the application, the problem of shaft part empty burning in the secondary heating process is solved, especially in the local critical deformation area, the grain size is small and uniform.

[0016] The disc part center thickness and the edge thickness ratio of the cross-section mutation large aspect ratio disc-shaft integrated piece is 1.5-3 in the application, which can effectively ensure the metal flow and realize reliable forming of the disc part.

[0017] The disc part diameter and the shaft part diameter ratio of the cross-section mutation large aspect ratio disc-shaft integrated piece is not less than 2 in the application, so that the disc part and the shaft part deformation ratio is basically the same, the disc part and the shaft part deformation is basically consistent, and the organization and performance consistency is improved.

[0018] The extrusion cylinder inner diameter and the blank outer diameter are the same in the application, so that the initial positioning of the blank is accurate, and plastic instability is avoided.

[0019] The extrusion speed is 20-500 mm / s, the contact time of the blank and the die is reduced, and the deformation resistance and friction caused by surface temperature drop are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the position relationship between the blank and the extrusion rod, the extrusion cylinder and the disc forming die before the extrusion of the present application.

[0021] Figure 2 It is a schematic diagram of a disc-shaft integrated part with large length-diameter ratio of cross-section mutation.

[0022] Figure 3 It is a comparison diagram of the initial (left) and the forming result (right) of GH4169 alloy extrusion forming.

[0023] Figure 4 It is a schematic diagram of the forming process of 1Cr11Ni2W2MoV heat-resistant steel.

[0024] Figure 5 It is a schematic diagram of the forming streamline and strain distribution result of 1Cr11Ni2W2MoV heat-resistant steel.

[0025] Figure 6 It is a comparison diagram of the initial (left) and the forming result (right) of titanium alloy hollow shaft extrusion forming.

[0026] Reference signs: 1-extrusion rod; 2-extrusion pad; 3-blank; 4-extrusion cylinder; 5-disc forming die. DETAILED DESCRIPTION

[0027] The present application is a disc-shaft integrated part with large length-diameter ratio of cross-section mutation bidirectional extrusion forming method, comprising the following steps: Step 1: forging design, the thickness ratio of the disc part center to the edge of the disc-shaft integrated part with large length-diameter ratio of cross-section mutation is 1.5-3; The diameter ratio of the disc part to the shaft part of the disc-shaft integrated part with large length-diameter ratio of cross-section mutation is not less than 2; Step 2: the extrusion rod 1, the extrusion cylinder 4 and the disc forming die 5 are installed in the fixed position of the press after preheating and coating lubricant; The preheating temperature of the extrusion rod 1, the extrusion cylinder 4 and the disc forming die 5 is 200-300℃, and the extrusion rod 1 and the extrusion cylinder 4 are hollow; Step 3: the blank 3 is heated and coated with lubricant, and then transferred to the extrusion area, which includes disc forming area and shaft forming area connected to each other; The disc forming area is the area surrounded by the hollow area of the extrusion cylinder 4 and the disc forming die 5 at one end towards the disc forming die 5, and the disc forming die 5 is located at the bottom of the extrusion cylinder 4; The shaft forming area is the hollow area of the extrusion cylinder 4 and the hollow area of the extrusion rod 1, and the extrusion rod 1 is located directly above the blank 3; Wherein, the diameter D of the blank 3 is (0.6~0.8)×(D1+D2); D1 is the diameter of the disc part of the disc-shaft integrated part with a large cross-section mutation and a large length-diameter ratio, and D2 is the diameter of the shaft part of the disc-shaft integrated part with a large cross-section mutation and a large length-diameter ratio; Step 4: Place the extrusion pad 2 on the blank 3 and wait for the extrusion to start; Step 5: Start extruding, move the extrusion rod 1 along with the press moving beam towards the disc forming die 5, and complete the radial-axial bidirectional composite extrusion forming; Step 6: After the extrusion is completed, move the extrusion rod 1 and the extrusion cylinder 4 in the reverse direction to complete the die release of the forging, and obtain the disc-shaft integrated part with a large cross-section mutation and a large length-diameter ratio.

[0028] In one embodiment, a disc-shaft integrated part with a large cross-section mutation and a large length-diameter ratio is provided, and a radial-axial bidirectional extrusion forming method thereof comprises the following steps: Step 1: Forging design, the ratio of the disc center thickness to the disc edge thickness of the disc-shaft integrated part with a large cross-section mutation and a large length-diameter ratio is 1.5-3; The ratio of the disc diameter to the shaft outer diameter of the disc-shaft integrated part with a large cross-section mutation and a large length-diameter ratio is not less than 2; Step 2: The extrusion rod 1, the extrusion cylinder 4, and the disc forming die 5 are preheated and coated with lubricant and then installed in the fixed position of the press; the disc forming die 5 comprises a disc forming upper die and a disc forming lower die arranged oppositely; The preheating temperature of the extrusion rod 1, the extrusion cylinder 4, and the disc forming die 5 is 200-300℃, and the extrusion cylinder 4 is hollow; Step 3: After the blank 3 is heated and coated with lubricant, it is transferred to the extrusion area, the blank 3 is in a hollow columnar shape, and the extrusion area comprises a disc forming area and a shaft forming area which are interconnected; The disc forming area is the hollow area of the extrusion cylinder 4 between the disc forming upper die and the disc forming lower die, the disc forming upper die is located above the blank 3, the disc forming upper die is located in the hollow area of the extrusion cylinder 4 and matches the inner diameter of the extrusion cylinder 4, and the disc forming lower die is below the extrusion cylinder 4; The shaft forming area is the area between the disc forming upper die and the disc forming lower die and the extrusion rod 1; Wherein, the outer diameter D of the blank 3 is (0.6~0.8)×(D1+D2); and the inner diameter of the blank 3 is the inner diameter of the shaft part of the disc-shaft integrated part with a large cross-section mutation and a large length-diameter ratio; D1 is the diameter of the disc part of the disc-shaft integrated part with a large cross-section mutation and a large length-diameter ratio, and D2 is the diameter of the shaft part of the disc-shaft integrated part with a large cross-section mutation and a large length-diameter ratio; Step 4: Place the extrusion pad 2 on the blank 3 and wait for the extrusion to start; Step 5: After the extrusion starts, the extrusion rod 1 moves with the press moving beam, and the disc forming upper die moves towards the disc forming lower die, and the radial-axial two-way composite extrusion forming is completed; Step 6: After the extrusion is completed, the extrusion rod 1, the disc forming upper die and the extrusion cylinder 4 move reversely, the forging is demolded, and the disc shaft integrated piece with a section mutation large length-diameter ratio is obtained.

[0029] In one embodiment, a shaft part protruding hole of the disc shaft integrated piece with a section mutation large length-diameter ratio is arranged at the center of the disc forming lower die.

[0030] In one embodiment, the extrusion speed is 20-500 mm / s.

[0031] In one embodiment, the inner diameter of the extrusion cylinder 4 is the same as the outer diameter of the blank 3.

[0032] In one embodiment, the extrusion pad 2 is an extrusion pad 2 prepared from lubricating glass powder.

[0033] In one embodiment, the blank 3 is a titanium alloy blank 3 or a nickel-based alloy blank 3.

[0034] The present application is described below in conjunction with the drawings.

[0035] Embodiment 1: Radial-axial two-way extrusion forming of GH4169 alloy forming disc shaft integrated piece with section mutation large length-diameter ratio Step 1: Forging design, the thickness ratio of the disc part center to the edge of the disc shaft integrated piece with a section mutation large length-diameter ratio is 1.5-3. Step 2: The extrusion rod 1, the extrusion cylinder 4 and the disc forming die 5 are preheated and coated with lubricant, and then installed in the fixed position of the press, and the preheating temperature of the above devices is 200-300°C.

[0036] Step 3: After the blank 3 is heated and coated with lubricant, it is transferred to the inside of the extrusion cylinder 4, as shown in Figure 1 , the heating temperature is 1010°C; Step 4: Place the extrusion pad 2 and wait for the extrusion to start. Step 5: The extrusion rod 1 moves with the press moving beam, and the radial-axial two-way composite extrusion forming is completed, and the extrusion speed is 50 mm / s.

[0037] Step 6: The extrusion rod 1 and the extrusion cylinder 4 move reversely, and the forging is demolded. The comparison chart of the initial and the forming result of the GH4169 alloy extrusion forming is shown in Figure 3 .

[0038] Embodiment 2: Radial-axial two-way extrusion forming of 1Cr11Ni2W2MoV heat-resistant steel disc shaft integrated forging with section mutation large length-diameter ratio Step 1: forging design, the ratio of the center thickness to the edge thickness of the disc part of the cross-section mutation large aspect ratio disc-shaft integrated piece is 1.5-3; Step 2: the extrusion rod 1, the extrusion cylinder 4 and the disc forming die 5 are installed in the fixed position of the press after preheating and coating lubricant, the disc forming die 5 includes a disc forming upper die and a disc forming lower die arranged oppositely, and the preheating temperature of the extrusion rod 1, the extrusion cylinder 4 and the disc forming die 5 is 200-300 DEG C; the extrusion cylinder 4 is hollow; and the disc forming lower die is provided with a shaft part protruding hole of the cross-section mutation large aspect ratio disc-shaft integrated piece at the center.

[0039] Step 3: the blank 3 is transferred to the inside of the extrusion cylinder 4 after being heated and coated with lubricant, and the heating temperature is 1050 DEG C; Step 3: place the extrusion pad 2 and wait for the extrusion to start; Step 4: the extrusion rod 1 moves with the moving beam of the press, drives the disc forming upper die to move towards the disc forming lower die, and the blank 3 is extruded, and the material flows to the area between the extrusion rod 1 and the disc forming upper die and the area between the extrusion rod 1 and the disc forming lower die to form the shaft part of the cross-section mutation large aspect ratio disc-shaft integrated piece; the material in the extrusion cylinder 4 between the disc forming upper die and the disc forming lower die is extruded to form the disc part of the cross-section mutation large aspect ratio disc-shaft integrated piece through the disc forming upper die towards the disc forming lower die, the radial-axial bidirectional composite extrusion forming is completed, the extrusion speed is 30 mm / s, and the forming process is shown in Figure 4 .

[0040] Step 6: the extrusion rod 1 and the extrusion cylinder 4 are sequentially moved backward, the forging is demoulded, and the forming streamline and strain distribution result of the 1Cr11Ni2W2MoV heat-resistant steel are shown in Figure 5 .

[0041] Example 3 Radial-axial bidirectional extrusion forming of Ti55531 alloy cross-section mutation large aspect ratio disc-shaft integrated forging Step 1: forging design, the ratio of the center thickness to the edge thickness of the disc part of the cross-section mutation large aspect ratio disc-shaft integrated piece is 1.5-3; Step 2: the extrusion rod 1, the extrusion cylinder 4 and the disc forming die 5 are installed in the fixed position of the press after preheating and coating lubricant, the preheating temperature of the above device is 200-300 DEG C; and the disc forming die 5 includes a disc forming upper die and a disc forming lower die arranged oppositely; Step 3: the blank 3 or the bar stock is transferred to the inside of the extrusion cylinder 4 after being heated and coated with lubricant, and the heating temperature is 820 DEG C; Step 3: place the extrusion pad 2 and wait for the extrusion to start; Step 4: the extrusion rod 1 moves with the moving beam of the press, drives the disc forming upper die to move towards the disc forming lower die, and the radial-axial bidirectional composite extrusion forming is completed, and the extrusion speed is 50 mm / s. Step 5: The extrusion rod 1 and the extrusion cylinder 4 are moved backward in turn, and the forging is demolded; the initial and the result of the titanium alloy hollow shaft extrusion forming are compared as shown in Figure 6 .

Claims

1. A radial-axial bidirectional extrusion forming method for a disc-shaft integrated part with a sudden change in cross section and a large aspect ratio, characterized in that: The following steps are involved: Step 1: Forging design: The ratio of the center thickness to the edge thickness of the disc of the disc-shaft integrated part with a sudden change in cross section and a large aspect ratio is 1.5-3; The ratio of the disc diameter to the shaft diameter of the disc-shaft integrated component with a sudden change in cross-section and a large aspect ratio shall not be less than 2; Step 2: The extrusion rod, extrusion cylinder, and disc forming die are preheated, coated with lubricant, and then installed in a fixed position on the press; The preheating temperature of the extrusion rod, extrusion cylinder and disc forming die is 200-300°C, and the extrusion rod and extrusion cylinder are both hollow; Step 3: After heating and coating the blank with lubricant, the blank is transferred to an extrusion area, which includes a disk forming area and a shaft forming area that are interconnected; The disc forming area is: the hollow area of ​​the extrusion cylinder and the area surrounded by the disc forming die at one end thereof, wherein the disc forming die is located at the bottom of the extrusion cylinder; The shaft forming area is formed by the hollow area of ​​the extrusion cylinder and the hollow area of ​​the extrusion rod being connected to each other, and the extrusion rod is located directly above the blank; Among them, the billet diameter D = (0.6~0.8) × (D1+D2); D1 is the diameter of the disc portion of the disc-shaft integrated component with a sudden change in cross section and a large aspect ratio, and D2 is the diameter of the shaft portion of the disc-shaft integrated component with a sudden change in cross section and a large aspect ratio; Step 4: Place the extrusion pad on the billet and wait for extrusion to begin; Step 5: Extrusion starts, and the extrusion rod moves toward the disc forming die along with the moving crossbeam of the press, completing the radial and axial bidirectional composite extrusion forming; Step 6: After the extrusion is completed, the extrusion rod and the extrusion cylinder move in opposite directions to complete the demoulding of the forging, and a disk-shaft integrated part with a sudden change in cross section and a large aspect ratio is obtained.

2. A radial-axial bidirectional extrusion forming method for a disc-shaft integrated part with a sudden change in cross section and a large aspect ratio, characterized in that: The following steps are involved: Step 1: Forging design: The ratio of the center thickness to the edge thickness of the disc of the disc-shaft integrated part with a sudden change in cross section and a large aspect ratio is 1.5-3; The ratio of the disc diameter to the shaft outer diameter of the disc-shaft integrated component with a sudden change in cross-section and a large aspect ratio shall not be less than 2; Step 2: After preheating and applying lubricant, the extrusion rod, extrusion cylinder, and disc forming die are installed in a fixed position of the press; the disc forming die includes a disc forming upper die and a disc forming lower die arranged opposite to each other; The preheating temperature of the extrusion rod, extrusion cylinder and disc forming die is 200-300°C, and the extrusion cylinder is hollow; Step 3: After heating and coating the blank with lubricant, the blank is transferred to an extrusion area. The blank is in a hollow cylindrical shape. The extrusion area includes a disk forming area and a shaft forming area that are interconnected. The disc forming area is: the hollow area of ​​the extrusion barrel between the disc forming upper die and the disc forming lower die, the disc forming upper die is located above the blank, the disc forming upper die is located in the hollow area of ​​the extrusion barrel and matches the inner diameter of the extrusion barrel; the disc forming lower die is below the extrusion barrel; The shaft forming area is the area between the disc forming upper film and the disc forming lower die and the extrusion rod; Among them, the outer diameter of the blank D = (0.6~0.8) × (D1+D2); the inner diameter of the blank is the inner diameter of the shaft part of the disc-shaft integrated part with a sudden change in cross section and a large aspect ratio; D1 is the diameter of the disc portion of the disc-shaft integrated component with a sudden change in cross section and a large aspect ratio, and D2 is the diameter of the shaft portion of the disc-shaft integrated component with a sudden change in cross section and a large aspect ratio; Step 4: Place the extrusion pad on the billet and wait for extrusion to begin; Step 5: Extrusion starts, and the extrusion rod moves along with the moving crossbeam of the press, driving the disc forming upper die to move toward the disc forming lower die, completing the radial and axial bidirectional composite extrusion forming; Step 6: After the extrusion is completed, the extrusion rod, the disc forming upper die and the extrusion barrel move in the opposite direction to complete the demoulding of the forging, thus obtaining a disc-shaft integrated part with a sudden change in cross section and a large aspect ratio.

3. A radial-axial bidirectional extrusion forming method for a disc-shaft integrated component with a sudden change in cross-section and a large aspect ratio as described in claim 1 or 2, characterized in that: A shaft extension hole of a disc-shaft integrated part with a sudden change in cross section and a large aspect ratio is provided at the center of the disc-forming lower die.

4. A radial-axial bidirectional extrusion forming method for a disc-shaft integrated component with a sudden change in cross-section and a large aspect ratio as described in claim 1 or 2, characterized in that: Extrusion speed 20~500mm / s.

5. A radial-axial bidirectional extrusion forming method for a disc-shaft integrated component with a sudden change in cross-section and a large aspect ratio as described in claim 1 or 2, characterized in that: The inner diameter of the extrusion cylinder is the same as the outer diameter of the billet.

6. A radial-axial bidirectional extrusion forming method for a disc-shaft integrated component with a sudden change in cross-section and a large aspect ratio as described in claim 1 or 2, characterized in that: The squeeze pad is a squeeze pad made of lubricating glass powder.

7. A radial-axial bidirectional extrusion forming method for a disk-shaft integrated component with a sudden change in cross-section and a large aspect ratio as described in claim 1 or 2, characterized in that: The blank is a titanium alloy blank or a nickel-based alloy blank.

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