A method for high frequency pulse current assisted forming of titanium-aluminum layered composite pipe

Abstract

The application provides a high-frequency pulse current assisted forming method of a titanium-aluminum layered composite pipe and belongs to the technical field of non-ferrous metal preparation. In view of the current requirement for lightweight of weapon equipment and pressure shell components, the problems of low cost of aluminum alloy and high strength and high price of titanium alloy are considered comprehensively, a plate blank is prepared through vacuum hot pressing, and the titanium-aluminum layered composite pipe is prepared through the method of current assisted stamping and strong power staggered spinning. In the preparation process, the material utilization rate is high, titanium and aluminum are heated through local micro current to generate coordinated plastic deformation in the stamping and spinning process, the grain coarsening of the plate is avoided, the titanium / aluminum interface is metallurgically combined, and the pipe forming is good. The preparation method is advanced and is a very ideal method for preparing a high-performance layered composite pipe.

Description

Technical Field

[0001] This invention belongs to the technical field of non-ferrous metal preparation, and specifically discloses a high-frequency pulse current-assisted forming method for titanium-aluminum layered composite tubes. Background Technology

[0002] Non-ferrous metal materials are lightweight and high-strength, and are widely used in aerospace, underwater equipment, and automobile manufacturing. However, in some specialized fields, single-metal materials can no longer meet the demands for lightweight and high strength. Layered composite materials, which combine the characteristics of component materials, represent the future direction of materials development.

[0003] Aluminum alloys are widely used in petrochemical, underwater equipment, and pressure vessel industries due to their advantages of being lightweight, high-strength, and inexpensive. However, as the pressure-bearing capacity of products increases, single aluminum alloy materials can no longer meet the requirements. Compared to aluminum alloys, titanium alloys have higher strength and corrosion resistance, but titanium alloys have a higher density and are more expensive. Combining aluminum and titanium alloys to create a titanium-aluminum layered composite pressure-bearing shell can combine lightweight properties with higher pressure-bearing capacity, while also improving the corrosion resistance of the shell.

[0004] However, due to the differences in physical and chemical properties between aluminum alloys and titanium alloys, it is difficult to coordinate plastic deformation during the spinning process of pipe sections, resulting in layer interface separation. Aluminum alloys deform while titanium alloys do not. Alternatively, due to material accumulation, the poor plastic deformation of titanium alloys during the stamping and spinning process can cause tearing, making it impossible to spin the pipe sections. Summary of the Invention

[0005] This invention provides a high-frequency pulsed current-assisted forming method for titanium-aluminum layered composite tubes. The method uses a vacuum hot pressing method to combine titanium alloy and aluminum alloy to obtain a multi-layered composite plate with a metallurgically bonded interface. After multiple drawing processes, a tube blank for spinning is prepared. The multi-layered titanium-aluminum layered composite tube is then spun into shape using a high-frequency pulsed current-assisted high-force staggered spinning method. Ultimately, this method can produce a lightweight, high-pressure-bearing, and highly corrosion-resistant layered composite material shell.

[0006] This invention provides a high-frequency pulsed current-assisted forming method for titanium-aluminum layered composite tubes, comprising the following steps;

[0007] S1, Preparation of titanium-aluminum layered composite plate

[0008] ①Assemble aluminum alloy plates and titanium alloy plates into blanks. The assembled blanks can be in two forms: aluminum / titanium / aluminum and titanium / aluminum / titanium.

[0009] ② The assembled titanium-aluminum laminated slab is placed in a vacuum hot press furnace for vacuum hot pressing. The hot pressing process is as follows: pressure 100MPa, hot pressing temperature 595±5℃, vacuum degree 10. -2 Below Pa, after holding for 2 hours, the furnace is cooled. When the furnace temperature drops below 100℃, the vacuum hot press furnace is opened and the titanium-aluminum layered composite plate obtained by vacuum hot pressing is taken out.

[0010] S2, Preparation of titanium-aluminum layered composite tube blank

[0011] ①Based on the dimensions of the annular positioning groove of the die in the high-frequency pulse current assisted stamping and drawing device, the titanium-aluminum layered composite plate is processed into a round plate;

[0012] ② Place the circular titanium-aluminum layered composite plate in the annular positioning groove of the die, turn on the pressure system of the high-frequency pulse current assisted stamping and drawing device, so that the punch of the stamping die contacts the titanium-aluminum layered composite plate, turn on the high-frequency pulse current, so that a current loop is formed between the high-frequency pulse power supply, the punch, the die and the titanium-aluminum layered composite plate, and perform high-frequency pulse current assisted stamping and drawing forming on the titanium-aluminum layered composite plate. The stamping speed is 2mm / min and the stamping temperature is 490±10℃.

[0013] ③ After stamping is completed, turn off the high-frequency pulse power supply and pressure system, remove the punch, and take out the stamped titanium-aluminum layered composite spun tube blank;

[0014] S3, Preparation of titanium-aluminum layered composite tubes

[0015] The titanium-aluminum layered composite tube blank is placed on the mandrel of a high-frequency pulse current assisted spinning machine. The mandrel and the spinning wheel are turned on, so that the spinning wheel contacts the titanium-aluminum layered composite tube blank. The high-frequency pulse power supply is turned on, so that a current loop is formed between the high-frequency pulse power supply, the spinning wheel, the titanium-aluminum layered composite tube blank and the mandrel. The titanium-aluminum layered composite tube blank is spun multiple times with high-frequency pulse current assisted spinning. The mandrel speed is 150 r / min, the feed ratio is 1:1, the thinning amount per pass is less than 10%, and the spinning temperature is 480±20℃. Finally, the thinning amount reaches 70%, and the titanium-aluminum layered composite tube is produced.

[0016] In step S1, the surface of the aluminum alloy plate is cleaned with a 10 wt.% NaOH solution and the surface of the titanium alloy plate is cleaned with a 5 vol.% HF solution to remove impurities. After drying, the plates are assembled.

[0017] In step S2, the titanium-aluminum layered composite plate is processed into a round plate using electrical discharge machining.

[0018] The above-mentioned high-frequency pulsed current assisted forming method for titanium-aluminum layered composite tubes also includes S4, machining.

[0019] The titanium-aluminum layered composite tubes obtained by high-frequency pulsed current assisted spinning are machined to the predetermined size by turning.

[0020] In step S1, the vacuum hot press furnace includes a furnace cavity, a first hydraulic cylinder, a first oil inlet pipe, a first oil return pipe, a first hydraulic oil tank, a first hydraulic pump, a pressure head, an upper pressure block, a lower pad block, an exhaust valve, a resistance wire, a vacuum tube, a vacuum pump, a water cooling pipe, a water inlet pipe, a water outlet pipe, a water tank, a water pump, and a first control cabinet. The first hydraulic cylinder is installed at the top of the furnace cavity. Its oil inlet is connected to the oil outlet of the first hydraulic pump through the first oil inlet pipe, and its oil return port is connected to the first hydraulic oil tank through the first oil return pipe. The piston passes through the top of the furnace cavity and is connected to the pressure head. The oil inlet of the first hydraulic pump is connected to the first hydraulic oil tank. The following steps are described: A lower pad is placed inside the furnace cavity; a titanium-aluminum laminated slab is placed on the lower pad; an upper pressure block is placed on the titanium-aluminum laminated slab; and a pressure head presses the upper pressure block. An exhaust valve penetrates the furnace wall of the furnace cavity. A resistance wire is installed on the inner wall of the furnace cavity; the air inlet of the vacuum tube passes through the furnace wall of the furnace cavity; and the air outlet is connected to the vacuum pump. Water-cooled pipes are arranged around the furnace cavity; the water inlet is connected to the water pump outlet via an inlet pipe; the water outlet is connected to the water tank via an outlet pipe; and the water pump inlet is connected to the water tank. The first control cabinet controls the first hydraulic cylinder, resistance wire, vacuum pump, and water pump via first control line a and first control line b.

[0021] In step S2, the high-frequency pulse current assisted stamping and drawing device includes an upper support frame, a worktable, support columns, a sliding positioning frame, a second hydraulic cylinder, a second oil inlet pipe, a second oil return pipe, a second hydraulic oil tank, a second hydraulic pump, an insulating pad, a conductive pad, a conductive pad connecting wire, a high-frequency pulse power supply, a punch, a thermocouple, a lower support frame, an insulating ring, a die, a die connecting wire, and a second control cabinet; the upper support frame is located above the worktable; multiple support columns pass through the upper support frame and the worktable, connecting the upper support frame and the worktable as a whole; the sliding positioning frame is slidably sleeved on the multiple support columns, located between the upper support frame and the worktable; the second hydraulic cylinder is installed on the top of the upper support frame, its oil inlet is connected to the oil outlet of the second hydraulic pump through the second oil inlet pipe, and its oil return port is connected to the second hydraulic pump through the second oil return pipe. The second return oil pipe is connected to the second hydraulic oil tank; the piston passes through the upper support frame and is connected to the sliding positioning frame; the oil inlet of the second hydraulic pump is connected to the second hydraulic oil tank; an insulating pad is installed on the bottom surface of the sliding positioning frame; a conductive pad is installed on the bottom surface of the insulating pad and is connected to the high-frequency pulse power supply through the conductive pad connecting line; a punch is installed on the bottom surface of the conductive pad; a thermocouple is installed in the punch and connected to the conductive pad; a lower support frame is installed on the worktable and has a through hole; an insulating ring is installed in the through hole; a die is installed in the insulating ring and is connected to the high-frequency pulse power supply through the die connecting line; the second control cabinet controls the second hydraulic cylinder and the high-frequency pulse power supply through the second control line a and the second control line b; a circular titanium-aluminum layered composite plate is placed in the annular positioning groove of the die.

[0022] In step S3, the high-frequency pulse current assisted spinning machine includes a housing, a mandrel, a mandrel fixing mechanism, a mandrel drive mechanism, a high-frequency pulse power supply, a clamping shaft, an insulating sleeve, a third hydraulic cylinder, a third hydraulic pump, a third hydraulic oil tank, a first spinning wheel, a second spinning wheel, a third spinning wheel, and a third control cabinet. The mandrel fixing mechanism is installed inside the housing; the mandrel drive mechanism is installed outside the housing; the mandrel is horizontally positioned inside the housing, with its input end connected to the mandrel drive mechanism via the mandrel fixing mechanism, and is driven to rotate by the mandrel drive mechanism. The mandrel is connected to the high-frequency pulse power supply via a mandrel connecting line; the clamping shaft is horizontally positioned inside the housing, at the same height as the mandrel, with its input end passing through the housing and connected to the third hydraulic cylinder, and its output end fitted with an insulating sleeve, and is driven to extend and retract laterally by the third hydraulic cylinder; the oil inlet of the third hydraulic cylinder is connected to the oil outlet of the third hydraulic pump via a third oil inlet pipe, and the oil return port is connected to the third hydraulic oil tank via a third oil return pipe; the third hydraulic... The pump's inlet is connected to the third hydraulic oil tank; the first, second, and third rotating wheels are all rotatably mounted inside the tank and can all move axially along the spindle. The first and second rotating wheels are located below the spindle, and the third rotating wheel is located above the spindle; the first, second, and third rotating wheels are respectively equipped with a first conductive slip ring, a second conductive slip ring, and a third conductive slip ring, which are connected to the high-frequency pulse power supply via first conductive slip ring connecting lines, second conductive slip ring connecting lines, and third conductive slip ring connecting lines, respectively; the third control cabinet controls the spindle drive mechanism, the third hydraulic cylinder, the first rotating wheel, the second rotating wheel, and the third rotating wheel via third control line a, and controls the high-frequency pulse power supply via third control line b; the titanium-aluminum layered composite tube blank is sleeved on the output end of the spindle and is pressed by the output end of the clamping shaft, with its outer wall in contact with the first, second, and third rotating wheels.

[0023] The present invention has the following beneficial effects.

[0024] This invention addresses the current demand for lightweight weaponry and pressure-bearing shell components. Considering the low cost and light weight of aluminum alloys versus the high cost and high strength of titanium alloys, it utilizes a vacuum hot-pressing process to create slabs, followed by current-assisted stamping and high-strength staggered spinning to fabricate titanium-aluminum layered composite tubes. This process boasts high material utilization; the titanium and aluminum undergo coordinated plastic deformation through localized micro-area current heating during stamping and spinning, preventing grain coarsening and growth in the slab; and metallurgical bonding occurs at the titanium / aluminum interface, resulting in well-formed tubes. This advanced manufacturing method is an ideal approach for producing high-performance layered composite tubes. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the vacuum hot pressing process for titanium-aluminum laminated slabs;

[0027] Figure 2 A schematic diagram of the stamping and drawing process for a circular titanium-aluminum layered composite plate;

[0028] Figure 3 A schematic diagram of the spinning process for titanium-aluminum layered composite tube blanks;

[0029] Figure 4 This is a microscopic morphology diagram of the titanium-aluminum interface.

[0030] The attached chart is listed below:

[0031] 1-Titanium-aluminum laminated slab blank; 2-Circular titanium-aluminum laminated composite plate; 3-Titanium-aluminum laminated composite tube blank.

[0032] 101-Furnace cavity, 102-First hydraulic cylinder, 103-Pressure head, 104-Outlet valve, 105-Upper pressure block, 106-Resistance wire, 107-Vacuum tube, 108-Vacuum pump, 109-First base, 110-Lower pad, 111-Water inlet pipe, 112-Water outlet pipe, 113-First control line a, 114-Water tank, 115-Water pump, 116-First hydraulic oil tank, 117-First control line b, 118-Pressure control Controller, 119-Temperature controller, 120-Vacuum pump controller, 121-First power switch, 122-First power switch indicator light, 123-Vacuum indicator light, 124-Temperature indicator light, 125-Pressure indicator light, 126-First display screen, 127-First control cabinet, 128-First hydraulic pump, 129-First pressure gauge a, 130-First pressure gauge b, 131-First oil inlet pipe, 132-First oil return pipe;

[0033] 201-Second hydraulic cylinder, 202-Upper support frame, 203-Sliding positioning frame, 204-Insulating pad, 205-Support column, 206-Workbench, 207-First terminal of die connection line, 208-Die connection line, 209-Second terminal of die connection line, 210-Second terminal of conductive pad connection line, 211-High-frequency pulse power supply, 212-Second control line b, 213-Second pressure gauge b, 214-Second pressure gauge a, 215-Second hydraulic oil tank, 216-Second control line a, 217-Frequency controller, 218-Frequency controller indicator light, 219-Voltage controller, 220-Voltage indicator light, 221-Current controller, 222-Current indicator light, 223-Second power supply Switch b, 224-Second power switch b indicator light, 225-Second display screen b, 226-Speed ​​controller, 227-Upper stroke controller, 228-Lower stroke controller, 229-Second power switch a, 230-Second power switch a indicator light, 231-Second control cabinet, 232-Lower stroke controller indicator light, 233-Upper stroke controller indicator light, 234-Speed ​​controller indicator light, 235-Second display screen a, 236-Lower support frame, 237-Insulating ring, 238-Die, 239-Punch, 240-Thermocouple, 241-Second oil return pipe, 242-Second oil inlet pipe, 243-Conductive pad connecting wire, 244-Conductive pad connecting wire first terminal, 245-Conductive pad;

[0034] 301-Box housing, 302-Mandrel, 303-Mandrel fixing mechanism, 304-Mandrel drive mechanism, 305-Mandrel connecting wire, 306-Third conductive slip ring connecting wire, 307-Mandrel connecting wire terminal, 308-Conductive slip ring connecting wire terminal, 309-Second conductive slip ring connecting wire, 310-Third base, 311-First conductive slip ring connecting wire, 312-High frequency pulse power supply, 313-Third control line b, 314-Second support shaft, 315-Second conductive slip ring connecting wire terminal, 316-Second conductive slip ring, 317-Second rotating wheel, 318-First conductive slip ring connecting wire terminal, 319-First conductive slip ring, 320-First rotating wheel, 321-First support shaft, 322-First support frame, 323- Tightening shaft, 324-Third control line a, 325-Third hydraulic cylinder, 326-High frequency current controller, 327-High frequency voltage controller, 328-Spindle speed controller, 329-Roller feed controller, 330-Roller angle controller, 331-Third power switch, 332-Third power switch indicator light, 333-Roller angle indicator light, 334-Roller feed indicator light, 335-Spindle speed indicator light, 336-Third display screen, 337-High frequency voltage indicator light, 338-High frequency current indicator light, 339-Third control cabinet, 340-Insulating sleeve, 341-Third support frame, 342-Third support shaft, 343-Third roller, 344-Third conductive slip ring, 345-Third conductive slip ring connection terminal. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] This embodiment provides a high-frequency pulsed current-assisted forming method for titanium-aluminum layered composite tubes. It employs a vacuum hot pressing method to prepare multiple alternating titanium-aluminum laminates, forming a metallurgical bond between the titanium and aluminum interfaces. This improves the interfacial bonding performance of the titanium-aluminum tube section during spinning. The multi-layered titanium-aluminum laminates are drawn into a spun tube blank through multiple drawing processes. High-frequency pulsed current is applied during spinning to connect the spinning wheel, tube blank, and mandrel, forming a closed loop with the tube blank. This achieves localized heating at the contact points between the spinning wheel and the tube blank, improving the interfacial coordination and plastic deformation between the multi-layered titanium-aluminum alloys, increasing the interfacial bonding strength, and ultimately achieving the spinning forming of the multi-layered titanium-aluminum layered composite tube.

[0037] The chemical materials used are: titanium alloy plate, aluminum alloy plate, hydrofluoric acid, sodium hydroxide, deionized water, and sandpaper. The combined quantities are as follows: measured in pieces, grams, millimeters, and milliliters.

[0038]

[0039]

[0040] The method is as follows.

[0041] S1, Preparation of titanium-aluminum layered composite plate

[0042] ① Clean the surface of the aluminum alloy plate with a 10wt.% NaOH solution to remove impurities, and dry it for later use;

[0043] ② Clean the surface of the titanium alloy plate with a 5 vol.% HF solution to remove impurities, and dry it for later use;

[0044] ③Assemble aluminum alloy plates and titanium alloy plates into blanks. The assembled blanks can be in two forms: aluminum / titanium / aluminum and titanium / aluminum / titanium.

[0045] ④ Place the assembled titanium-aluminum laminated slab in a vacuum hot press furnace for vacuum hot pressing. The hot pressing process is as follows: pressure 100MPa, hot pressing temperature 595±5℃, vacuum degree 10. -2 Below Pa, after a holding time of 2 hours, the furnace is cooled. When the furnace temperature drops below 100℃, the vacuum hot press furnace is opened, and the titanium-aluminum laminated composite plate obtained by vacuum hot pressing is taken out. If two sets of titanium-aluminum laminated plates are vacuum hot pressed at the same time, graphite paper is placed between the two sets of titanium-aluminum laminated plates to prevent them from joining together during the vacuum hot pressing process.

[0046] S2, Preparation of titanium-aluminum layered composite tube blank

[0047] ①Based on the dimensions of the annular positioning groove of die 238 in the high-frequency pulse current assisted stamping and drawing device, the titanium-aluminum layered composite plate is processed into a round plate (the diameter is 80mm in this embodiment) by electrical discharge machining.

[0048] ② Place the circular titanium-aluminum layered composite plate 2 in the annular positioning groove of the die 238, turn on the pressure system of the high-frequency pulse current assisted stamping and drawing device, so that the punch 239 of the stamping die contacts the titanium-aluminum layered composite plate, turn on the high-frequency pulse current 211, so that a current loop is formed between the high-frequency pulse power supply 211, the punch 239, the die 238 and the titanium-aluminum layered composite plate, and perform high-frequency pulse current assisted stamping and drawing forming on the titanium-aluminum layered composite plate. The stamping speed is 2mm / min and the stamping temperature is 490±10℃.

[0049] ③ After stamping is completed, turn off the high-frequency pulse power supply 211 and the pressure system, remove the punch 239, and take out the stamped titanium-aluminum layered composite spun tube blank.

[0050] S3, Preparation of titanium-aluminum layered composite tubes

[0051] ① Place the titanium-aluminum layered composite tube blank 3 on the mandrel 302 of the high-frequency pulse current assisted spinning machine, turn on the mandrel 302 and the spinning wheel, so that the spinning wheel contacts the titanium-aluminum layered composite tube blank 3, turn on the high-frequency pulse power supply 312, so that a current loop is formed between the high-frequency pulse power supply 312, the spinning wheel, the titanium-aluminum layered composite tube blank 3 and the mandrel 302, and perform high-frequency pulse current assisted spinning on the titanium-aluminum layered composite tube blank 3 in multiple passes. The mandrel speed is 150 r / min, the feed ratio is 1:1, the thinning amount per pass is less than 10%, the spinning temperature is 480±20℃, and finally the thinning amount reaches 70%, and the titanium-aluminum layered composite tube is produced.

[0052] ② After spinning is completed, turn off the high-frequency pulse power supply 312, remove the spinning wheel, and take off the spun titanium-aluminum layered composite tube.

[0053] S4, Machining

[0054] The titanium-aluminum layered composite tubes obtained by high-frequency pulsed current assisted spinning are machined to the predetermined size by turning.

[0055] S5, storage

[0056] The prepared titanium-aluminum layered composite tubes are packaged in soft material and stored in a clean, dry environment, protected from moisture, sunlight, and acid, alkali, and salt corrosion. The storage temperature is 20℃ and the relative humidity is ≤10%.

[0057] like Figure 4 As shown, titanium-aluminum laminates are prepared by vacuum hot pressing. The layered composite tube blank is formed by stamping and stretching and by high-strength staggered spinning with high-frequency pulsed current assistance. The formed tube blank and the titanium-aluminum interface are well bonded, achieving metallurgical bonding. No surface pores, microcracks, peeling, wrinkles or disconnection are generated. No peeling or tearing of the titanium-aluminum layer interface occurs during stamping and stretching and spinning. The two undergo coordinated plastic deformation, and the titanium-aluminum interface is metallurgically bonded.

[0058] The vacuum hot press furnace includes a furnace cavity 101, a first hydraulic cylinder 102, a first oil inlet pipe 131, a first oil return pipe 132, a first hydraulic oil tank 116, a first hydraulic pump 128, a pressure head 103, an upper pressure block 105, a lower pad block 110, an air outlet valve 104, a resistance wire 106, a vacuum tube 107, a vacuum pump 108, a water cooling pipe, a water inlet pipe 111, a water outlet pipe 112, a water tank 114, a water pump 115, a first base 109, and a first control cabinet 127.

[0059] The first hydraulic cylinder 102 is installed at the top of the furnace chamber 101. Its oil inlet is connected to the oil outlet of the first hydraulic pump 128 via the first oil inlet pipe 131, and its oil return port is connected to the first hydraulic oil tank 116 via the first oil return pipe 132. The piston passes through the top of the furnace chamber 101 and is connected to the pressure head 103. The oil inlet of the first hydraulic pump 128 is connected to the first hydraulic oil tank 116. A lower pad 110 is placed inside the furnace chamber 101. The titanium-aluminum laminated slab 1 is placed on the lower pad 110, and an upper pressure block 105 is placed on the titanium-aluminum laminated slab 1. The pressure head 103 presses the upper pressure block 105. An exhaust valve 104 passes through the furnace chamber. The furnace wall of the furnace cavity 101; the resistance wire 106 is installed on the inner wall of the furnace cavity 101; the air inlet of the vacuum tube 107 passes through the furnace wall of the furnace cavity 101, and the air outlet is connected to the vacuum pump 108; the water cooling pipe is arranged around the furnace cavity, the water inlet is connected to the water outlet of the water pump 115 through the water inlet pipe 111, the water outlet is connected to the water tank 114 through the water outlet pipe 112, and the water inlet of the water pump 115 is connected to the water tank 114; the first control cabinet 127 controls the first hydraulic cylinder 102, the resistance wire 106, the vacuum pump 108, and the water pump 115 through the first control line a113 and the first control line b117.

[0060] The furnace chamber 101 and the vacuum pump 108 are mounted on the first base 109.

[0061] The first hydraulic oil tank 116 is equipped with a first pressure gauge a129 and a first pressure gauge b130.

[0062] The first control cabinet 127 is equipped with a pressure controller 118, a temperature controller 119, a vacuum pump controller 120, a first power switch 121, a first power switch indicator light 122, a vacuum indicator light 123, a temperature indicator light 124, a pressure indicator light 125, and a first display screen 126.

[0063] The high-frequency pulse current assisted stamping and drawing device includes an upper support frame 202, a worktable 206, a support column 205, a sliding positioning frame 203, a second hydraulic cylinder 201, a second oil inlet pipe 242, a second oil return pipe 241, a second hydraulic oil tank 215, a second hydraulic pump, an insulating pad 204, a conductive pad 245, a conductive pad connecting wire 243, a high-frequency pulse power supply 211, a punch 239, a thermocouple 240, a lower support frame 236, an insulating ring 237, a die 238, a die connecting wire 208, and a second control cabinet 231.

[0064] The upper support frame 202 is located above the workbench 206; multiple support columns 205 pass through the upper support frame 202 and the workbench 206, connecting them into one unit; a sliding positioning frame 203 is slidably sleeved on the multiple support columns 206, located between the upper support frame 202 and the workbench 206; a second hydraulic cylinder 201 is installed on the top of the upper support frame 202, its oil inlet is connected to the oil outlet of the second hydraulic pump through the second oil inlet pipe 242, and its oil return port is connected to the second hydraulic oil tank 215 through the second oil return pipe 241; the piston passes through the upper support frame 202 and is connected to the sliding positioning frame 203; the oil inlet of the second hydraulic pump is connected to the second hydraulic oil tank 215; an insulating pad 204 is installed. On the bottom surface of the sliding positioning frame 203; a conductive pad 245 is installed on the bottom surface of the insulating pad 204 and connected to the high-frequency pulse power supply 211 through the conductive pad connecting line 243; a punch 239 is installed on the bottom surface of the conductive pad 245; a thermocouple 240 is installed in the punch 239 and connected to the conductive pad 245; a lower support frame 236 is installed on the workbench 206 and has a through hole; an insulating ring 237 is installed in the through hole; a die 238 is installed in the insulating ring 237 and connected to the high-frequency pulse power supply 211 through the die connecting line 208; the second control cabinet 231 controls the second hydraulic cylinder 201 and the high-frequency pulse power supply 211 through the second control line a216 and the second control line b212.

[0065] The second hydraulic oil tank 215 is equipped with a second pressure gauge a214 and a second pressure gauge b213.

[0066] The conductive pad 245 is equipped with the first terminal 244 of the conductive pad connecting wire, and the high-frequency pulse power supply 211 is equipped with the second terminal 210 of the conductive pad connecting wire.

[0067] The die 238 is equipped with the first terminal 207 of the die connection wire, and the high-frequency pulse power supply 211 is equipped with the second terminal 209 of the die connection wire.

[0068] The second control cabinet 231 is equipped with a second display screen a235, a speed controller indicator light 234, an upper travel controller indicator light 233, a lower travel controller indicator light 232, a second power switch a indicator light 230, a second power switch a 229, a lower travel controller 228, an upper travel controller 227, a speed controller 226, a second display screen b225, a second power switch b indicator light 224, a second power switch b 223, a current indicator light 222, a current controller 221, a voltage indicator light 220, a voltage controller 219, a frequency modulation controller indicator light 218, and a frequency modulation indicator light 217.

[0069] The circular titanium-aluminum layered composite plate 2 is placed in the annular positioning groove of the concave mold 238.

[0070] The high-frequency pulse current assisted spinning machine includes a housing 301, a spindle 302, a spindle fixing mechanism 303, a spindle driving mechanism 304, a high-frequency pulse power supply 312, a clamping shaft 323, an insulating sleeve 340, a third hydraulic cylinder 325, a third hydraulic pump, a third hydraulic oil tank, a first spinning wheel 320, a second spinning wheel 317, a third spinning wheel 343, and a third control cabinet 339.

[0071] A spindle fixing mechanism 303 is installed inside the housing 301; a spindle driving mechanism 304 is installed outside the housing 301; a spindle 302 is horizontally arranged inside the housing 301, and its input end is connected to the spindle driving mechanism 304 through the spindle fixing mechanism 303, and is driven to rotate by the spindle driving mechanism 304; the spindle 302 is connected to a high-frequency pulse power supply 312 through a spindle connecting line 304; a clamping shaft 323 is horizontally arranged inside the housing 301, at the same height as the spindle 302, and its input end passes through the housing 301 and connects to the third... A hydraulic cylinder 325 is connected, and an insulating sleeve 340 is fitted on the output end. It is driven by the third hydraulic cylinder 325 to extend and retract laterally. The oil inlet of the third hydraulic cylinder 325 is connected to the oil outlet of the third hydraulic pump via a third oil inlet pipe, and the oil return port is connected to the third hydraulic oil tank via a third oil return pipe. The oil inlet of the third hydraulic pump is connected to the third hydraulic oil tank. The first rotating wheel 320, the second rotating wheel 317, and the third rotating wheel 343 are all rotatably mounted inside the housing 301 and can all move axially along the spindle. The second rotating wheel 317 is located below the spindle 302, and the third rotating wheel 343 is located above the spindle 302. A first conductive slip ring 319, a second conductive slip ring 316, and a third conductive slip ring 344 are respectively mounted on the first rotating wheel 320, the second rotating wheel 317, and the third rotating wheel 343. The first conductive slip ring 319, the second conductive slip ring 316, and the third conductive slip ring 344 are respectively connected by a first conductive slip ring connecting line 311, a second conductive slip ring connecting line 309, and a third conductive slip ring connecting line 306. It is connected to the high-frequency pulse power supply 312; the third control cabinet 339 controls the spindle drive mechanism 304, the third hydraulic cylinder 325, the first rotating wheel 320, the second rotating wheel 317, and the third rotating wheel 343 through the third control line a324, and controls the high-frequency pulse power supply 312 through the third control line b313; the titanium-aluminum layered composite tube blank 3 is sleeved on the output end of the spindle 302 and is pressed by the output end of the clamping shaft 323, and the outer wall is in contact with the first rotating wheel 320, the second rotating wheel 317, and the third rotating wheel 343.

[0072] The installation method of the rotating wheel is as follows: the first support frame 322 is installed vertically inside the housing 301, the first support shaft 321 is installed horizontally on the first support frame 322, and the first rotating wheel 320 is installed on the first support shaft 321; the second support shaft 314 is installed horizontally inside the housing 301, and the second rotating wheel 317 is installed on the second support shaft 314; the third support frame 341 is installed vertically inside the housing 301, the third support shaft 342 is installed horizontally on the third support frame 341, and the third rotating wheel 343 is installed on the third support shaft 342.

[0073] The high-frequency pulse power supply 312 is equipped with a spindle connection terminal 307 and a conductive slip ring connection terminal 308.

[0074] The first conductive slip ring 319, the second conductive slip ring 316, and the third conductive slip ring 344 are respectively equipped with the first conductive slip ring connection wire terminal 318, the second conductive slip ring connection wire terminal 315, and the third conductive slip ring connection wire terminal 345.

[0075] The third control cabinet 339 is equipped with a high-frequency current indicator 338, a high-frequency voltage indicator 337, a third display screen 336, a spindle speed indicator 335, a rotary wheel feed indicator 334, a rotary wheel angle indicator 333, a third power switch indicator 332, a third power switch 331, a rotary wheel angle controller 330, a rotary wheel feed controller 329, a spindle speed controller 328, a high-frequency voltage controller 327, and a high-frequency current controller 326.

[0076] Both the enclosure 301 and the third control cabinet 339 are mounted on the third base 310.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for high-frequency pulsed current-assisted forming of titanium-aluminum layered composite tubes, characterized in that, Includes the following steps; S1, Preparation of titanium-aluminum layered composite plate ①Assemble aluminum alloy plates and titanium alloy plates into blanks. The assembled blanks can be in two forms: aluminum / titanium / aluminum and titanium / aluminum / titanium. ② The assembled titanium-aluminum laminated slab is placed in a vacuum hot press furnace for vacuum hot pressing. The hot pressing process is as follows: pressure 100MPa, hot pressing temperature 595±5℃, vacuum degree 10. -2 Below Pa, after holding for 2 hours, the furnace is cooled. When the furnace temperature drops below 100℃, the vacuum hot press furnace is opened and the titanium-aluminum layered composite plate obtained by vacuum hot pressing is taken out. S2, Preparation of titanium-aluminum layered composite tube blank ①Based on the dimensions of the annular positioning groove of the die in the high-frequency pulse current assisted stamping and drawing device, the titanium-aluminum layered composite plate is processed into a round plate; ② Place the circular titanium-aluminum layered composite plate in the annular positioning groove of the die, turn on the pressure system of the high-frequency pulse current assisted stamping and drawing device, so that the punch of the stamping die contacts the titanium-aluminum layered composite plate, turn on the high-frequency pulse current, so that a current loop is formed between the high-frequency pulse power supply, the punch, the die and the titanium-aluminum layered composite plate, and perform high-frequency pulse current assisted stamping and drawing forming on the titanium-aluminum layered composite plate. The stamping speed is 2mm / min and the stamping temperature is 490±10℃. ③ After stamping is completed, turn off the high-frequency pulse power supply and pressure system, remove the punch, and take out the stamped titanium-aluminum layered composite spun tube blank; S3, Preparation of titanium-aluminum layered composite tubes The titanium-aluminum layered composite tube blank is placed on the mandrel of a high-frequency pulse current assisted spinning machine. The mandrel and the spinning wheel are turned on, so that the spinning wheel contacts the titanium-aluminum layered composite tube blank. The high-frequency pulse power supply is turned on, so that a current loop is formed between the high-frequency pulse power supply, the spinning wheel, the titanium-aluminum layered composite tube blank and the mandrel. The titanium-aluminum layered composite tube blank is spun multiple times with high-frequency pulse current assisted spinning. The mandrel speed is 150 r / min, the feed ratio is 1:1, the thinning amount per pass is less than 10%, and the spinning temperature is 480±20℃. Finally, the thinning amount reaches 70%, and the titanium-aluminum layered composite tube is produced.

2. The high-frequency pulse current-assisted forming method for titanium-aluminum layered composite tubes according to claim 1, characterized in that, In step S1, the surface of the aluminum alloy plate is cleaned with a 10 wt.% NaOH solution and the surface of the titanium alloy plate is cleaned with a 5 vol.% HF solution to remove impurities from the surface. After drying, the plates are assembled.

3. The high-frequency pulse current-assisted forming method for titanium-aluminum layered composite tubes according to claim 2, characterized in that, In step S2, the titanium-aluminum layered composite plate is processed into a round plate using electrical discharge machining.

4. The high-frequency pulse current-assisted forming method for titanium-aluminum layered composite tubes according to claim 3, characterized in that, Also includes S4, machining The titanium-aluminum layered composite tubes obtained by high-frequency pulsed current assisted spinning are machined to the predetermined size by turning.

5. The high-frequency pulse current-assisted forming method for titanium-aluminum layered composite tubes according to claim 1, characterized in that, In step S1, the vacuum hot press furnace includes a furnace cavity, a first hydraulic cylinder, a first oil inlet pipe, a first oil return pipe, a first hydraulic oil tank, a first hydraulic pump, a pressure head, an upper pressure block, a lower pad block, an air outlet valve, a resistance wire, a vacuum tube, a vacuum pump, a water cooling pipe, a water inlet pipe, a water outlet pipe, a water tank, a water pump, and a first control cabinet. The first hydraulic cylinder is installed at the top of the furnace cavity. The oil inlet is connected to the oil outlet of the first hydraulic pump through the first oil inlet pipe, and the oil return port is connected to the first hydraulic oil tank through the first oil return pipe. The piston passes through the top of the furnace cavity and is connected to the pressure head. The inlet of the first hydraulic pump is connected to the first hydraulic oil tank; The lower pad block is placed inside the furnace cavity, the titanium-aluminum laminated slab is placed on the lower pad block, the upper pressure block is placed on the titanium-aluminum laminated slab, and the pressure head presses the upper pressure block. The vent valve penetrates the furnace wall of the furnace cavity; The resistance wire is installed on the inner wall of the furnace cavity. The vacuum tube's inlet passes through the furnace wall of the furnace chamber, and its outlet is connected to the vacuum pump. Water-cooled pipes are arranged around the furnace cavity. The water inlet is connected to the water pump outlet through the water inlet pipe, the water outlet is connected to the water tank through the water outlet pipe, and the water pump inlet is connected to the water tank. The first control cabinet controls the first hydraulic cylinder, resistance wire, vacuum pump, and water pump via the first control line a and the first control line b.

6. The high-frequency pulse current-assisted forming method for titanium-aluminum layered composite tubes according to claim 1, characterized in that, In step S2, the high-frequency pulse current assisted stamping and drawing device includes an upper support frame, a worktable, a support column, a sliding positioning frame, a second hydraulic cylinder, a second oil inlet pipe, a second oil return pipe, a second hydraulic oil tank, a second hydraulic pump, an insulating pad, a conductive pad, a conductive pad connecting wire, a high-frequency pulse power supply, a punch, a thermocouple, a lower support frame, an insulating ring, a die, a die connecting wire, and a second control cabinet. The upper support frame is located above the workbench; Multiple support columns pass through the upper support frame and the worktable, connecting the upper support frame and the worktable into one unit; The sliding positioning frame is slidably mounted on multiple support columns and is located between the upper support frame and the worktable; The second hydraulic cylinder is installed on the top of the upper support frame. The oil inlet is connected to the oil outlet of the second hydraulic pump through the second oil inlet pipe, and the oil return port is connected to the second hydraulic oil tank through the second oil return pipe. The piston passes through the upper support frame and is connected to the sliding positioning frame. The inlet of the second hydraulic pump is connected to the second hydraulic oil tank; An insulating pad is installed on the bottom surface of the sliding positioning frame; The conductive pad is installed on the bottom surface of the insulating pad and is connected to the high-frequency pulse power supply through the conductive pad connecting wire; The punch is installed on the bottom surface of the conductive pad; The thermocouple is installed in the punch and connected to the conductive pad. The lower support frame is mounted on the workbench and has through holes; The insulating ring is installed inside the through hole; The die is installed inside the insulating ring and connected to the high-frequency pulse power supply via a die connection wire. The second control cabinet controls the second hydraulic cylinder and the high-frequency pulse power supply via the second control line a and the second control line b. A circular titanium-aluminum layered composite plate is placed in the annular positioning groove of the concave mold.

7. The high-frequency pulse current-assisted forming method for titanium-aluminum layered composite tubes according to claim 1, characterized in that, In step S3, the high-frequency pulse current assisted spinning machine includes a housing, a mandrel, a mandrel fixing mechanism, a mandrel driving mechanism, a high-frequency pulse power supply, a clamping shaft, an insulating sleeve, a third hydraulic cylinder, a third hydraulic pump, a third hydraulic oil tank, a first spinning wheel, a second spinning wheel, a third spinning wheel, and a third control cabinet. The spindle fixing mechanism is installed inside the housing; The spindle drive mechanism is mounted outside the housing; The spindle is horizontally arranged inside the housing. The input end is connected to the spindle drive mechanism through the spindle fixing mechanism and is driven to rotate by the spindle drive mechanism. The spindle is connected to the high-frequency pulse power supply through the spindle connecting wire. The clamping shaft is horizontally installed inside the housing, at the same height as the spindle. The input end passes through the housing and is connected to the third hydraulic cylinder. The output end is fitted with an insulating sleeve and is driven by the third hydraulic cylinder to extend and retract laterally. The oil inlet of the third hydraulic cylinder is connected to the oil outlet of the third hydraulic pump through the third oil inlet pipe, and the oil return port is connected to the third hydraulic oil tank through the third oil return pipe. The inlet of the third hydraulic pump is connected to the third hydraulic oil tank; The first, second, and third rotating wheels are all rotatably mounted inside the housing and can all move along the spindle axis. The first and second rotating wheels are located below the spindle, and the third rotating wheel is located above the spindle. The first, second, and third rotating wheels are respectively equipped with a first conductive slip ring, a second conductive slip ring, and a third conductive slip ring. The first, second, and third conductive slip rings are respectively connected to a high-frequency pulse power supply through a first conductive slip ring connecting wire, a second conductive slip ring connecting wire, and a third conductive slip ring connecting wire. The third control cabinet controls the spindle drive mechanism, the third hydraulic cylinder, the first rotating wheel, the second rotating wheel, and the third rotating wheel via the third control line a, and controls the high-frequency pulse power supply via the third control line b. The titanium-aluminum layered composite tube blank is sleeved on the output end of the mandrel and is tightened by the output end of the clamping shaft. The outer wall is in contact with the first, second, and third rotating wheels.

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