A titanium alloy arc-shaped thin-walled double-layer plate auxiliary forming annealing device and method

Abstract

The present invention discloses a titanium alloy circular arc thin-walled double-layer plate auxiliary forming annealing device and method, wherein the punch is fixed on the upper platform of the press, and the die is fixed on the lower platform of the press, and the movement of the punch is ensured to correspond to that of the die through the press; the punch, the punch insulating and heat-insulating layer and the punch auxiliary plate are connected in sequence from the inside to the outside, and the die, the die insulating and heat-insulating layer and the die auxiliary plate are connected in sequence from the inside to the outside. The titanium alloy circular arc thin-walled double-layer plate auxiliary forming annealing device and method solve the difficult problems of large springback and low forming precision in the bending forming of titanium and titanium alloy circular arc thin-walled components; realize rapid heating and heat preservation of titanium and titanium alloy circular arc thin-walled curved components, avoid the heating and cooling process of the forming mold, improve forming efficiency, extend the life of the mold, and reduce energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic forming of titanium alloy thin-walled components, and in particular provides a double-layer plate auxiliary forming annealing device and method for titanium alloy circular arc thin-walled components. Background Art

[0002] Titanium and its alloys have been widely used in aerospace and other fields due to their low density, high strength at room temperature and high temperatures, and good corrosion and oxidation resistance. For example, many large-scale arc-shaped sealing structures at the hot and cold ends of aircraft engines are used. However, titanium and its alloys have poor plastic deformation capacity at room temperature, high deformation resistance, and severe springback of formed parts. Especially for arc-shaped thin-walled components with small curvature, it is difficult to achieve precise forming of parts at room temperature through simple mold shape compensation. Moreover, after forming, the parts will also change in shape and size due to stress release at high temperature.

[0003] Therefore, existing titanium and titanium alloy arc-shaped thin-walled curved parts usually adopt the hot forming method, which can achieve precise forming of the shape and size of the parts on the one hand, and also make the parts have good thermal stability of shape and size on the other hand. However, in traditional hot forming, the mold and the forming plate blank are usually placed in a heating furnace, and the forming temperature is reached by heat radiation and heat conduction. Due to the high forming temperature of titanium alloy, the heating and cooling cycles are long, the production efficiency is low, the energy consumption is large, and the production cost is high. In addition, the forming mold is exposed to high temperature environment for a long time, which makes its surface prone to oxidation. The shedding of oxide scale will affect the surface quality of the formed part. The compressive stress repeatedly applied during the forming process can also easily cause the mold to creep deform, affecting the dimensional shape accuracy of the surface. These unfavorable factors will reduce the service life of the mold. In addition, when titanium alloy undergoes plastic deformation in a hot state, the work hardening phenomenon is weakened and the friction force increases, resulting in insufficient material flow and reduced uniformity of the wall thickness distribution of the formed part. For the current energy field assisted thermoforming process of thin-walled parts, due to the small wall thickness and low overall heat of the parts, the temperature of the parts drops rapidly after contact with the mold, the forming stress increases, and the springback increases. Especially for parts with small curvature, the forming accuracy is significantly reduced.

[0004] People are eager to obtain a double-layer plate auxiliary forming annealing device and method for titanium alloy circular arc thin-walled parts with excellent technical effects. Summary of the Invention

[0005] The purpose of the present invention is to provide a double-layer plate auxiliary forming annealing device and method for titanium alloy circular arc thin-walled parts with excellent technical effects. In view of the shortcomings of existing forming processes such as large springback and low forming accuracy in the cold forming process of large-sized titanium alloy circular arc bent parts, thinning of part wall thickness, high energy consumption and short mold life in traditional hot forming, and rapid cooling rate of thin-walled plate blank in contact with mold in current energy field assisted forming, a double-layer plate auxiliary forming annealing device and method for titanium alloy circular arc thin-walled parts are proposed to achieve efficient, high-quality and low-energy precision forming of large-sized titanium alloy circular arc bent parts.

[0006] The titanium alloy circular arc thin-walled double-layer plate auxiliary forming annealing device includes: a hydraulic press, a side clamping device, a punch, a punch insulating and heat-insulating layer, a punch auxiliary plate, a die auxiliary plate, a die insulating and heat-insulating layer, a die, an electrode, a power supply, a temperature measuring thermocouple, a side clamping device insulating and heat-insulating layer and a side clamping device auxiliary plate; the thermocouple is inserted into the through hole of the die to measure the temperature of the slab, wherein the punch is fixed on the upper platform of the press, the side clamping device is connected to another vertically movable platform of the press, the side clamping device is installed on both sides of the punch, the side clamping device insulating and heat-insulating layer and the side clamping device auxiliary plate are installed on the surface of the side clamping device from the inside to the outside, and the die is fixed on the lower platform of the press. The platform is provided, and a press is used to ensure that the movement of the punch corresponds to that of the die; the punch, the punch insulating and heat-insulating layer and the punch auxiliary plate are connected in sequence from the inside to the outside, and the die, the die insulating and heat-insulating layer and the die auxiliary plate are connected in sequence from the inside to the outside, and a temperature measuring thermocouple is placed in the through hole of the die to measure the temperature of the formed slab in real time. The positive electrode and the negative electrode of the electrode are respectively located between the die insulating and heat-insulating layer and the die auxiliary plate on both sides of the die; the positive electrode and the negative electrode are electrically connected to the power supply, the positive electrode of the electrode is installed on one side of the die, and the negative electrode of the electrode is installed on the other side of the die. When power is turned on, the punch auxiliary plate, the die auxiliary plate and the formed slab form a current loop through the electrodes.

[0007] The material of the male mold insulation and heat insulation layer and the female mold insulation and heat insulation layer is ceramic material or asbestos gasket.

[0008] Preferably, the male auxiliary plate is a metal plate of approximately the same thickness as the male model surface, and the female auxiliary plate is a metal plate of approximately the same thickness as the female model surface.

[0009] The specific steps of the titanium alloy circular arc thin-walled double-layer plate auxiliary forming annealing method are as follows:

[0010] Step 1: cutting the formed slab into the shape and size to be processed;

[0011] Step 2: Treat the surfaces of the punch, die, and edge-holding device with an insulating and heat-insulating coating, with a thickness of the insulating and heat-insulating layer ranging from 5µm to 800µm.

[0012] Step 3: Install the punch on the upper platform of the hydraulic press and the die on the lower platform of the hydraulic press, ensuring that the centers of the punch and die are aligned; install the punch auxiliary plate and the die auxiliary plate on the punch surface and the die surface respectively;

[0013] Step 4: Install the edge holding device on another vertically movable platform of the hydraulic press, and install the auxiliary plate of the edge holding device on the surface of the edge holding device;

[0014] Step 5: Install the electrode between the die insulation layer and the die auxiliary plate;

[0015] Step 6: Connect the power supply and electrodes. The current range of the power supply is 0A~30000A.

[0016] Step 7: Place the titanium alloy forming slab on the die auxiliary plate, aligning its position with the punch and die.

[0017] Step 8: Start the hydraulic press, move the edge holding device downward, apply edge holding force to the formed slab, and bend the formed slab;

[0018] Step 9: The punch moves downward to form the slab at room temperature. Under the combined action of forming force and blank holding force, the punch auxiliary plate, the slab and the die auxiliary plate are tightly fitted together, while providing a pressing force between the electrode and the three-layer plate.

[0019] Step 10: Start the power supply, pass the current to heat the punch auxiliary plate, the forming plate blank and the die auxiliary plate to 600°C~900°C and then keep them warm;

[0020] Step 11: After keeping warm for 1-15 minutes, gradually reduce the current value until the value returns to zero and then turn off the power;

[0021] Step 12: Turn off the power switch, start the hydraulic press, lift the punch and the edge holding device, and take out the formed parts.

[0022] The described double-layer plate auxiliary forming annealing device and method for titanium alloy circular arc-shaped thin-walled parts addresses the shortcomings of existing forming technologies for existing titanium alloy circular arc-shaped uniform / non-uniform cross-section thin-walled components. It proposes utilizing the work hardening effect of cold forming to improve the uniformity of part wall thickness and extend mold life; utilizing the Joule heating effect of electric current to achieve rapid heating of the slab and reduce energy consumption; utilizing upper and lower auxiliary metal plates to achieve thermal insulation of the formed slab; and, in addition, the design of built-in electrodes in the mold also enables zero-residue processing of formed parts. The comprehensive utilization of the advantages of cold forming and electric current energy field-assisted hot forming, as well as the optimized design of the forming loading sequence and mold tooling structure, makes this patent creative and novel in the field of efficient, high-quality, low-energy precision forming of large-sized titanium alloy circular arc-shaped thin-walled components.

[0023] The double-layer plate auxiliary forming annealing device and method for titanium alloy arc-shaped thin-walled parts solves the difficult problems of large springback and low forming precision in the bending forming of titanium and titanium alloy arc-shaped thin-walled components; realizes rapid heating and heat preservation of titanium and titanium alloy arc-shaped thin-walled curved components, avoids the heating and cooling process of the forming mold, improves the forming efficiency, extends the mold life, and reduces energy consumption; utilizes the phenomenon of work hardening of titanium alloy formed at room temperature to promote the flow of materials in the forming process, and improves the uniformity of wall thickness distribution of traditional hot-formed parts; the built-in electrode design avoids the wear of soft copper electrodes and extends the service life of the forming device; realizes the electrode clamping of complex cross-section thin-walled curved components with little or no margin; avoids the rapid cooling phenomenon caused by the high-temperature forming slab contacting the forming mold, and realizes uniform distribution of the forming slab temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0025] Figure 1 It is a schematic diagram of the relative position relationship between the forming device and the formed slab;

[0026] Figure 2 yes Figure 1 Schematic cross-section of the AA section;

[0027] Figure 3 It is a structural schematic diagram of the forming device when forming is completed;

[0028] Figure 4 yes Figure 3 Schematic cross-sectional view of section AA.

[0029] Among them, 1. edge holding device; 2. punch; 3. punch insulation and heat insulation layer; 4. punch auxiliary plate; 5. forming plate; 6. die auxiliary plate; 7. die insulation and heat insulation layer; 8. die; 9. electrode; 10. power supply; 11. temperature measuring thermocouple; 12. edge holding device insulation and heat insulation layer; 13. edge holding device auxiliary plate. DETAILED DESCRIPTION

[0030] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only for the purpose of explaining the present invention and are not to be construed as limiting the present invention in any way. Based on the teachings of the present invention, a skilled person can conceive of any possible variations based on the present invention, and such variations should be considered to fall within the scope of the present invention.

[0031] Example 1

[0032] The titanium alloy arc-shaped thin-walled double-layer plate auxiliary forming annealing device includes: a hydraulic press, a side clamping device 1, a punch 2, a punch insulating and heat-insulating layer 3, a punch auxiliary plate 4, a die auxiliary plate 6, a die insulating and heat-insulating layer 7, a die 8, an electrode 9, a power supply 10, a temperature measuring thermocouple 11, a side clamping device insulating and heat-insulating layer 12 and a side clamping device auxiliary plate 13; the thermocouple is inserted into the through hole of the die to measure the temperature of the slab, wherein the punch 2 is fixed on the upper platform of the press, the side clamping device 1 is connected to another vertically moving platform of the press, the side clamping device 1 is installed on both sides of the punch 2, the side clamping device insulating and heat-insulating layer 12 and the side clamping device auxiliary plate 13 are installed on the surface of the side clamping device from the inside to the outside, and the die 8 is fixed on the lower platform of the press. The platform is configured to be a stationary platform, and a press is used to ensure that the movement of the punch corresponds to that of the die; the punch 2, the punch insulating and heat-insulating layer 3 and the punch auxiliary plate 4 are connected in sequence from the inside to the outside, and the die 8, the die insulating and heat-insulating layer 7 and the die auxiliary plate 6 are connected in sequence from the inside to the outside. A temperature measuring thermocouple 11 is placed in the through hole of the die 8 to measure the temperature of the formed slab 5 in real time. The positive electrode and the negative electrode of the electrode 9 are respectively located between the die insulating and heat-insulating layer 7 and the die auxiliary plate 6 on both sides of the die 8; the positive electrode and the negative electrode are electrically connected to the power supply 10, the positive electrode of the electrode 9 is installed on one side of the die 8, and the negative electrode of the electrode 9 is installed on the other side of the die 8. When power is turned on, the punch auxiliary plate 4, the die auxiliary plate 6 and the formed slab 5 all form a current loop through the electrode 9.

[0033] The male mold insulation and heat insulation layer 3 and the female mold insulation and heat insulation layer 7 are made of ceramic material or asbestos gasket.

[0034] Preferably, the punch auxiliary plate 4 is a metal plate of approximately the same thickness as the punch 2 , and the die auxiliary plate 6 is a metal plate of approximately the same thickness as the die 8 .

[0035] The specific steps of the titanium alloy circular arc thin-walled double-layer plate auxiliary forming annealing method are as follows:

[0036] Step 1: cutting the formed slab 5 into the shape and size to be processed;

[0037] Step 2: Apply insulation and heat insulation coating to the surface of the punch 2, the die 8 and the edge holding device 1, with the thickness of the insulation and heat insulation layer being between 5µm and 800µm;

[0038] Step 3: Install the punch 2 on the upper platform of the hydraulic press and the die 8 on the lower platform of the hydraulic press, ensuring that the centers of the punch 2 and the die 8 are aligned; install the punch auxiliary plate 4 and the die auxiliary plate 6 on the surface of the punch 2 and the surface of the die 8 respectively;

[0039] Step 4: Install the edge holding device 1 on another vertically movable platform of the hydraulic press, and install the edge holding device auxiliary plate 13 on the surface of the edge holding device 1;

[0040] Step 5: Install the electrode 9 between the die insulation layer 7 and the die auxiliary plate 6;

[0041] Step 6: Connect the power supply 10 and the electrode 9. The current value of the power supply 10 ranges from 0A to 30000A.

[0042] Step 7: Place the titanium alloy forming slab 5 on the die 8, aligning its position with the punch 2 and the die 8;

[0043] Step 8: Start the hydraulic press, and the edge holding device 1 moves downward to apply edge holding force to the formed slab 5, causing the formed slab 5 to bend and deform;

[0044] Step 9: The punch 2 moves downward to form the forming slab 5 at room temperature. Under the combined action of the forming force and the blank holding force, the punch auxiliary plate 4, the forming slab 5 and the die auxiliary plate 6 are tightly fitted together, while providing a pressing force between the electrode and the three-layer plate.

[0045] Step 10: Start the power supply 10, pass the current to heat the punch auxiliary plate 4, the forming plate 5 and the die auxiliary plate 6 to 600°C to 900°C and then keep them warm;

[0046] Step 11: After keeping warm for 1-15 minutes, gradually reduce the current value until the value returns to zero and then turn off the power 10;

[0047] Step 12: Turn off the power 10, start the hydraulic press, lift the punch 2 and the edge holding device 1, and take out the formed part.

[0048] Example 2

[0049] The specific steps of the titanium alloy circular arc thin-walled double-layer plate auxiliary forming annealing method are as follows:

[0050] Step 1: cutting the formed slab 5 into the shape and size to be processed;

[0051] Step 2: Apply insulation and heat insulation coating to the surface of the punch 2, the die 8 and the edge holding device 1, with the thickness of the insulation and heat insulation layer being 5µm to 50µm;

[0052] Step 3: Install the punch 2 on the upper platform of the hydraulic press and the die 8 on the lower platform of the hydraulic press, ensuring that the centers of the punch 2 and the die 8 are aligned; install the punch auxiliary plate 4 and the die auxiliary plate 6 on the surface of the punch 2 and the surface of the die 8 respectively;

[0053] Step 4: Install the edge holding device 1 on another vertically movable platform of the hydraulic press, and install the edge holding device auxiliary plate 13 on the surface of the edge holding device 1;

[0054] Step 5: Install the electrode 9 between the die insulation layer 7 and the die auxiliary plate 6;

[0055] Step 6: Connect the power supply 10 and the electrode 9. The current value of the power supply 10 ranges from 0A to 30000A.

[0056] Step 7: Place the titanium alloy forming slab 5 on the die auxiliary plate 6, and align its position with the punch 2 and the die 8;

[0057] Step 8: Start the hydraulic press, and the edge holding device 1 moves downward to apply edge holding force to the formed slab 5, causing the formed slab 5 to bend and deform;

[0058] Step 9: The punch 2 moves downward to form the forming slab 5 at room temperature. Under the combined action of the forming force and the blank holding force, the punch auxiliary plate 4, the forming slab 5 and the die auxiliary plate 6 are tightly fitted together, while providing a pressing force between the electrode and the three-layer plate.

[0059] Step 10: Start the power supply 10, pass the current to heat the punch auxiliary plate 4, the forming plate 5 and the die auxiliary plate 6 to 600°C to 900°C and then keep them warm;

[0060] Step 11: After keeping warm for 1-15 minutes, gradually reduce the current value until the value returns to zero and then turn off the power 10;

[0061] Step 12: Turn off the power 10, start the hydraulic press, lift the punch 2 and the edge holding device 1, and take out the formed part.

[0062] Example 3

[0063] The specific steps of the titanium alloy circular arc thin-walled double-layer plate auxiliary forming annealing method are as follows:

[0064] Step 1: cutting the formed slab 5 into the shape and size to be processed;

[0065] Step 2: Insulation and heat insulation coating is applied to the surface of the punch 2, the die 8 and the edge holding device 1, and the thickness of the insulation layer is 700µm~800µm;

[0066] Step 3: Install the punch 2 on the upper platform of the hydraulic press and the die 8 on the lower platform of the hydraulic press, ensuring that the centers of the punch 2 and the die 8 are aligned; install the punch auxiliary plate 4 and the die auxiliary plate 6 on the surface of the punch 2 and the surface of the die 8 respectively;

[0067] Step 4: Install the edge holding device 1 on another vertically movable platform of the hydraulic press, and install the edge holding device auxiliary plate 13 on the surface of the edge holding device 1;

[0068] Step 5: Install the electrode 9 between the die insulation layer 7 and the die auxiliary plate 6;

[0069] Step 6: Connect the power supply 10 and the electrode 9. The current value of the power supply 10 ranges from 0A to 30000A.

[0070] Step 7: Place the titanium alloy forming slab 5 on the die auxiliary plate 6, and align its position with the punch 2 and the die 8;

[0071] Step 8: Start the hydraulic press, and the edge holding device 1 moves downward to apply edge holding force to the formed slab 5, causing the formed slab 5 to bend and deform;

[0072] Step 9: The punch 2 moves downward to form the forming slab 5 at room temperature. Under the combined action of the forming force and the blank holding force, the punch auxiliary plate 4, the forming slab 5 and the die auxiliary plate 6 are tightly fitted together, while providing a pressing force between the electrode and the three-layer plate.

[0073] Step 10: Start the power supply 10, pass current to heat the punch auxiliary plate 4, the forming plate 5 and the die auxiliary plate 6 to 800°C to 900°C and then keep them warm;

[0074] Step 11: After keeping warm for 1-15 minutes, gradually reduce the current value until the value returns to zero and then turn off the power 10;

[0075] Step 12: Turn off the power 10, start the hydraulic press, lift the punch 2 and the edge holding device 1, and take out the formed part.

[0076] Example 4

[0077] The specific steps of the titanium alloy circular arc thin-walled double-layer plate auxiliary forming annealing method are as follows:

[0078] Step 1: cutting the formed slab 5 into the shape and size to be processed;

[0079] Step 2: Insulation and heat insulation coating is applied to the surface of the punch 2, the die 8 and the edge holding device 1, and the thickness of the insulation and heat insulation layer is 100µm~300µm;

[0080] Step 3: Install the punch 2 on the upper platform of the hydraulic press and the die 8 on the lower platform of the hydraulic press, ensuring that the centers of the punch 2 and the die 8 are aligned; install the punch auxiliary plate 4 and the die auxiliary plate 6 on the surface of the punch 2 and the surface of the die 8 respectively;

[0081] Step 4: Install the edge holding device 1 on another vertically movable platform of the hydraulic press, and install the edge holding device auxiliary plate 13 on the surface of the edge holding device 1;

[0082] Step 5: Install the electrode 9 between the die insulation layer 7 and the die auxiliary plate 6;

[0083] Step 6: Connect the power supply 10 and the electrode 9. The current value of the power supply 10 ranges from 0A to 30000A.

[0084] Step 7: Place the titanium alloy forming slab 5 on the die auxiliary plate 6, and align its position with the punch 2 and the die 8;

[0085] Step 8: Start the hydraulic press, and the edge holding device 1 moves downward to apply edge holding force to the formed slab 5, causing the formed slab 5 to bend and deform;

[0086] Step 9: The punch 2 moves downward to form the forming slab 5 at room temperature. Under the combined action of the forming force and the blank holding force, the punch auxiliary plate 4, the forming slab 5 and the die auxiliary plate 6 are tightly fitted together, while providing a pressing force between the electrode and the three-layer plate.

[0087] Step 10: Start the power supply 10, pass the current to heat the male auxiliary plate 4, the forming plate 5 and the female auxiliary plate 6 to 700°C to 800°C and then keep them warm;

[0088] Step 11: After keeping warm for 1-15 minutes, gradually reduce the current value until the value returns to zero and then turn off the power 10;

[0089] Step 12: Turn off the power 10, start the hydraulic press, lift the punch 2 and the edge holding device 1, and take out the formed part.

Claims

1. A titanium alloy arc-shaped thin-walled double-layer plate auxiliary forming annealing device, characterized by: The titanium alloy arc-shaped thin-walled double-layer plate auxiliary forming annealing device comprises: a hydraulic press, a side pressing device (1), a punch (2), a punch insulation and heat insulation layer (3), a punch auxiliary plate (4), a die auxiliary plate (6), a die insulation and heat insulation layer (7), a die (8), an electrode (9), a power supply (10), a temperature measuring thermocouple (11), a side pressing device insulation and heat insulation layer (12) and a side pressing device auxiliary plate (13); wherein, the punch (2) is fixed on the upper platform of the press, the side pressing device (1) is connected to another vertically movable platform of the press, the side pressing device (1) is installed on both sides of the punch (2), the side pressing device insulation and heat insulation layer (12) and the side pressing device auxiliary plate (13) are arranged from the inside to the outside according to the above. The die (8) is mounted on the surface of the edge pressing device, and the die (8) is fixed on the lower platform of the press. The punch (2), the punch insulation layer (3) and the punch auxiliary plate (4) are connected in sequence from the inside to the outside. The die (8), the die insulation layer (7) and the die auxiliary plate (6) are connected in sequence from the inside to the outside. The temperature measuring thermocouple (11) is placed in the through hole of the die (8). The positive electrode and the negative electrode of the electrode (9) are respectively located between the die insulation layer (7) and the die auxiliary plate (6) on both sides of the die (8); the positive electrode and the negative electrode of the electrode (9) are electrically connected to the power supply (10), and the punch auxiliary plate (4), the die auxiliary plate (6) and the forming plate blank (5) all form a current loop through the electrode (9).

2. The titanium alloy arc-shaped thin-walled double-layer plate auxiliary forming annealing device according to claim 1, characterized in that: The punch auxiliary plate (4) is a metal plate of equal thickness and the same shape as the punch (2), and the die auxiliary plate (6) is a metal plate of equal thickness and the same shape as the die (8).

3. An annealing method for the titanium alloy arc-shaped thin-walled double-layer plate auxiliary forming annealing device according to claim 1, characterized in that: The specific steps of the titanium alloy circular arc thin-walled double-layer plate auxiliary forming annealing method are as follows: Step 1: cutting the formed slab (5) into the shape and size to be processed; Step 2: applying an insulating and heat-insulating coating to the surfaces of the punch (2), the die (8) and the edge-holding device (1), wherein the thickness of the insulating and heat-insulating layer is 5 μm to 800 μm; Step 3: Install the punch (2) on the upper platform of the hydraulic press and install the die (8) on the lower platform of the hydraulic press, ensuring that the center positions of the punch (2) and the die (8) are aligned; The male die auxiliary plate (4) and the female die auxiliary plate (6) are respectively mounted on the surface of the male die (2) and the surface of the female die (8); Step 4: Install the edge pressing device (1) on another vertically movable platform of the hydraulic press, and install the edge pressing device auxiliary plate (13) on the surface of the edge pressing device (1); Step 5: Install the electrode (9) between the die insulation layer (7) and the die auxiliary plate (6); Step 6: Connect the power supply (10) and the electrode (9), wherein the current value of the power supply (10) ranges from 0A to 30000A; Step 7: placing the titanium alloy forming slab (5) on the die auxiliary plate (6) so that its position is aligned with the punch (2) and the die (8); Step 8: Start the hydraulic press, and the edge holding device (1) moves downward to apply edge holding force to the formed slab (5), thereby causing the formed slab (5) to bend and deform; Step 9: The punch (2) moves downward to form the forming blank (5) at room temperature. Under the combined action of the forming force and the blank holding force, the punch auxiliary plate (4), the forming blank (5) and the die auxiliary plate (6) are tightly fitted together, while providing a pressing force between the electrode and the three-layer plate. Step 10: Start the power supply (10), and heat the male die auxiliary plate (4), the forming plate blank (5), and the female die auxiliary plate (6) to 600° C. to 900° C. through electric current, and then keep the temperature constant; Step 11: Keep warm for 1 to 15 minutes, then gradually reduce the current value until it returns to zero, and then turn off the power (10); Step 12: Turn off the power supply (10), start the hydraulic press, lift the punch (2) and the edge holding device (1), and take out the formed part.

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