Cold heading and friction welding composite forming process for hollow shaft and welding equipment

Abstract

The invention provides a cold heading and friction welding composite forming process for a hollow shaft and welding equipment. The cold heading and friction welding composite forming process comprises the following steps that S1, round steel hot punching is conducted; s2, sawing the pipe material; s3, straightening is carried out; s4, spheroidizing annealing of the round steel; s5, phosphorus saponification; s6, end cold heading; s7, friction welding is conducted; s8, isothermal normalizing is conducted; and S9, rough turning and boring. The invention further provides friction welding equipment for the hollow shaft, the friction welding equipment comprises a base, a support is fixedly installed on the base, the support is rotationally connected with a pipe material disc, a movable seat is further installed on the base, the top of the movable seat is rotationally connected with a shaft shoulder disc, a plurality of pipe material grooves are formed in the circumferential side wall of the pipe material disc, and the shaft shoulder disc is rotationally connected with the shaft shoulder disc. The top of the pipe tray is a feeding position, the rear side is a preheating position, and the bottom is a welding position. According to the technology, the hollow shaft is formed through the cold heading and friction welding composite technology, the formed structure comprises the through hole and the shaft shoulder, the material utilization rate is greatly increased, the manufacturing procedure is simplified, the cost is reduced, and meanwhile the follow-up machining allowance is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hollow motor shaft, and particularly relates to a cold heading and friction welding composite forming process and welding equipment for a hollow shaft. BACKGROUND

[0002] In recent years, new energy vehicles develop rapidly, and a motor shaft is one of core parts of a driving system of the new energy vehicles and has the functions of torque transmission and rotor fixation. The hollow motor shaft has many advantages such as light weight, good heat dissipation performance and small noise and vibration, and has gradually replaced the solid motor shaft to become a market mainstream.

[0003] The forming methods of the hollow motor shaft mainly include deep hole drilling, rotary swaging and cold extrusion. Such forming methods have disadvantages such as low material utilization rate, high equipment cost and short service life of tooling dies. In view of the problems existing in the hollow shaft forming process, the cold heading and friction welding composite process is adopted to form the hollow shaft. This method greatly improves the material utilization rate, simplifies the manufacturing process, reduces the cost, and at the same time reduces the subsequent machining allowance. SUMMARY

[0004] In view of the above problems, the present application provides a cold heading and friction welding composite forming process and welding equipment for a hollow shaft, which adopts the cold heading and friction welding composite process to form the hollow shaft. The formed structure includes a through hole and a shaft shoulder, which greatly improves the material utilization rate, simplifies the manufacturing process, reduces the cost, and at the same time reduces the subsequent machining allowance.

[0005] To solve the above problems, the technical scheme adopted by the present application is as follows: A cold heading and friction welding composite forming process for a hollow shaft, comprising the following steps: S1, hot piercing of round steel: the round steel adopts a hot piercing process to form a pipe blank with specific inner and outer diameter sizes; S2, pipe blank sawing: the pipe adopts a sawing process to be segmented into specific lengths; S3, straightening: the blank adopts a straightening process to improve the size accuracy and straightness; S4, round steel spheroidizing annealing: the round steel blank adopts a spheroidizing annealing process to improve the metal organization and reduce the hardness, facilitating subsequent cold heading; S5, phosphorus saponification: the blank adopts a phosphorus saponification process to reduce the friction between the blank and the die during the cold heading process; S6, cold heading of the end part: the round steel cold heading of the through hole and the shaft shoulder structure; S7, friction welding: the pipe blank and the end part of the shaft shoulder are friction welded by using a friction welding equipment; S8, isothermal normalizing: an isothermal normalizing process is adopted to release the internal stress of the cold heading and the friction welding and improve the organization; S9, rough turning and boring: rough turning of the outer circle and boring of the inner hole, removing the friction welding burr and the oxide skin of isothermal normalizing.

[0006] Preferably, the process parameters of S4 are: temperature 760±10℃, holding for 2-3h, furnace cooling to about 500℃, and then air cooling.

[0007] Preferably, the process parameters of S8 are: first normalizing temperature 930±10℃, holding for 1.5h, second isothermal temperature 600-650℃, holding for 2h, and then air cooling.

[0008] The application also provides a hollow shaft friction welding device, which comprises a base, a support fixedly installed on the base, a pipe material disc rotationally connected to the support, a moving seat installed on the base, a shaft shoulder disc rotationally connected to the top of the moving seat, a plurality of pipe material grooves for placing pipe materials arranged on the circumferential sidewall of the pipe material disc, a top of the pipe material disc as a feeding position, a rear side of the pipe material disc as a preheating position, and a bottom of the pipe material disc as a welding position, a positioning opening communicated with the pipe material grooves arranged on the right side of the pipe material disc, a clamping assembly installed in the positioning opening, a push plate installed on the left side of the pipe material disc corresponding to the feeding position and used for pushing the pipe material into the positioning opening, a first three-jaw chuck installed on the circumferential sidewall of the shaft shoulder disc and corresponding to the plurality of positioning openings, a preheating pipe installed between the pipe material disc and the shaft shoulder disc and corresponding to the preheating position, an electromagnetic chuck installed on the left side of the pipe material disc corresponding to the preheating position and used for pushing the end of the pipe material into the preheating pipe, a moving arm installed on the left side of the base, an inner supporting arm rotationally connected to the top of the moving arm, and an inner supporting mechanism installed on the inner supporting arm and used for supporting and abutting against the pipe material from the inside.

[0009] Preferably, the moving of the moving seat, the push plate, the electromagnetic chuck and the moving arm is realized through hydraulic cylinders.

[0010] Preferably, the pipe material disc and the shaft shoulder disc are driven to rotate through a driving shaft, and the driving shaft is rotationally connected to the moving seat and the support correspondingly.

[0011] Preferably, the clamping assembly is a second three-jaw chuck, the second three-jaw chuck is installed in the positioning opening, three-jaw ends of the second three-jaw chuck are rotationally connected to rollers abutting against the pipe material, a hydraulic oil pipe is installed at the center of the pipe material disc, one end of the hydraulic oil pipe in the pipe material disc is connected to the plurality of second three-jaw chucks through a plurality of branch pipes, one end of the hydraulic oil pipe in the shaft shoulder disc is connected to the plurality of first three-jaw chucks through a plurality of branch pipes, an electromagnetic valve is installed in each branch pipe, and the other end of the hydraulic oil pipe extends out of the driving shaft and is connected to a pump oil pipe through a rotary joint.

[0012] Preferably, the inner support mechanism comprises hydraulic expansion discs mounted at both ends of the inner support arm, a pair of the hydraulic expansion discs are provided with arc-shaped inner support plates at the corresponding expansion ends, the left end of the inner support arm is fixed with an end clamping seat, the side wall of the end clamping seat is fixed with a rotating shaft, the rotating shaft is rotatably connected to the moving arm, the hydraulic pipeline of the hydraulic expansion disc extends out of the rotating shaft and is connected to the pump oil pipe through a rotary joint.

[0013] Preferably, a motor is mounted on the moving arm, and the output end of the motor is connected to the rotating shaft through a belt pulley assembly.

[0014] Preferably, the inner bottom of the pipe groove is provided with a pair of telescopic grooves, the telescopic grooves are elastically connected with lifting seats through springs, the inner bottom of the telescopic grooves is provided with electromagnetic blocks, the bottom of the lifting seat is provided with magnetic blocks corresponding to the electromagnetic blocks, the left side of the pipe disc is provided with an electric head electrically connected with the corresponding electromagnetic blocks, and the support is provided with an electric seat corresponding to the electric head at the feeding position.

[0015] The beneficial effects of the present application are: 1. The hollow shaft is formed by adopting a cold heading and friction welding combined process, which improves material utilization; complex structures such as long through holes and shaft shoulders are formed, which reduces manufacturing cost; the blank size precision is high, and the subsequent machining allowance is reduced.

[0016] 2. By installing the pipe disc, the shaft shoulder disc, the feeding position, the preheating position and the welding position, the pipe is placed in the pipe groove at the feeding position, the shaft shoulder is clamped by the first three-jaw chuck, the push plate pushes one end of the pipe into the positioning port, the second three-jaw chuck is clamped, the corresponding end of the pipe is magnetically attracted by the electromagnetic chuck, the welding end of the pipe is pushed into the preheating pipe, the welding end of the corresponding shaft shoulder is brought into the preheating pipe by the moving seat, the welding end is preheated, after preheating, the welding position is turned to, the inner support arm is inserted into the pipe by the moving arm, the inner support mechanism supports the pipe from the inside, the motor is started, the rotating shaft is rotated by the belt pulley assembly, and finally the pipe is rotated at high speed by the inner support arm, the roller rolls, and the end is friction welded by the advancement of the moving arm and the moving seat. After welding, the second three-jaw chuck and the inner support mechanism release the pipe, the moving seat moves, the welded hollow motor shaft can be pulled out, the first three-jaw chuck is released, and the pipe can be discharged, which can realize a continuous and automatic welding process, and the preheating setting improves the welding efficiency.

[0017] 3. By installing the inner support mechanism, the inner support mechanism supports the pipe from the inside, and cooperates with the clamping of the external second three-jaw chuck, which can improve the clamping effect of the longer pipe and avoid end shaking during rotation. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The process flowchart of the present application is as follows: Figure 2 This is a schematic diagram of the pipe structure of the present invention; Figure 3 This is a schematic diagram of the shoulder structure of the present invention; Figure 4 This is a schematic diagram of the hollow motor shaft structure of the present invention; Figure 5 This is a schematic diagram of the friction welding equipment of the present invention; Figure 6 This is a left-side view of the tubular material tray proposed in this invention; Figure 7 for Figure 5 Enlarged schematic diagram of the structure at point A in the diagram; Figure 8 for Figure 5 Enlarged schematic diagram of the structure at point B in the diagram; Figure 9 This is a schematic diagram of the support state of the internal support mechanism proposed in this invention.

[0019] In the diagram: 1. Pipe tray, 2. Preheating pipe, 3. Shoulder plate, 4. Moving seat, 5. Drive shaft, 6. Hydraulic oil pipe, 7. Solenoid valve, 8. First three-jaw chuck, 9. Pipe groove, 10. Push plate, 11. Support, 12. Electrical connector, 13. Lifting seat, 14. Electromagnetic chuck, 15. Electrical connector, 16. Hydraulic expansion plate, 17. Inner support arm, 18. Arc-shaped inner support plate, 19. End seat, 20. Rotary shaft, 21. Pulley assembly, 22. Motor, 23. Base, 24. Positioning port, 25. Second three-jaw chuck, 26. Roller, 27. Electromagnetic block, 28. Magnetic block, 29. Telescopic groove, 30. Spring, 31. Moving arm, 32. Pipe, 33. Shoulder. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] Reference Figures 1-4 A composite forming process for cold heading and friction welding of hollow shafts includes the following steps: S1. Hot piercing of round steel: Round steel is formed into tubes with specific inner and outer diameters using a hot piercing process. S2, Pipe sawing: The pipe is cut into sections of specific lengths using a sawing process; S3. Straightening: The blank is straightened to improve dimensional accuracy and straightness. S4, round steel spheroidizing annealing: the round steel blank is subjected to spheroidizing annealing process to improve the metal structure and reduce the hardness, facilitating subsequent cold upsetting, the process parameters are: temperature 760±10℃, holding time 2-3h, furnace cooling to about 500℃, and then air cooling; S5, phosphorus saponification: the blank is subjected to phosphorus saponification process to reduce the friction between the blank and the die during cold upsetting; S6, cold upsetting end: the round steel cold upsetting through hole and the shaft shoulder structure; S7, friction welding: the tube material and the shaft shoulder end are subjected to friction welding by using a friction welding device; S8, isothermal normalizing: isothermal normalizing process is adopted to release the internal stress of cold upsetting and friction welding, improve the structure, the process parameters are: first normalizing temperature 930±10℃, holding time 1.5h, second isothermal temperature 600-650℃, holding time 2h, and then air cooling; S9, rough turning and boring: outer circle rough turning and inner hole boring are performed to remove the friction welding burr and the oxide skin of isothermal normalizing.

[0022] Referring to Figures 5-9 A hollow shaft friction welding device, comprising a base 23, a support 11 fixedly installed on the base 23, a tube material disc 1 rotationally connected to the support 11, a moving seat 4 also installed on the base 23, a shaft shoulder disc 3 corresponding to the tube material disc 1 rotationally connected to the top of the moving seat 4, a plurality of tube material grooves 9 for placing tube materials 32 are arranged on the circumferential side wall of the tube material disc 1, the top of the tube material disc 1 is a feeding position, the rear side is a preheating position, and the bottom is a welding position, the tube material disc 1 and the shaft shoulder disc 3 are both driven to rotate by a driving shaft 5, the driving shaft 5 is rotationally connected to the moving seat 4 and the support 11, and the continuous and automatic welding process can be realized.

[0023] A positioning opening 24 is arranged on the right side of the tube material groove 9 in communication, a clamping assembly is installed in the positioning opening 24, the clamping assembly is a second three-jaw chuck 25, the second three-jaw chuck 25 is installed in the positioning opening 24, three-jaw ends of the second three-jaw chuck 25 are all rotationally connected to rollers 26 abutting against the tube material 32, a hydraulic oil pipe 6 is installed at the center of the tube material disc 1 and the shaft shoulder disc 3, one end of the hydraulic oil pipe 6 in the tube material disc 1 is connected to a plurality of second three-jaw chucks 25 through a plurality of branch pipes, one end of the hydraulic oil pipe 6 in the shaft shoulder disc 3 is connected to a plurality of first three-jaw chucks 8 through a plurality of branch pipes, an electromagnetic valve 7 is installed in each branch pipe, the other end of the hydraulic oil pipe 6 extends out of the driving shaft 5 and is connected to a pump oil pipe through a rotary joint, when the electromagnetic valve 7 in the corresponding branch pipe is opened, the oil supply or oil suction process of the corresponding first three-jaw chuck 8 and the second three-jaw chuck 25 can be realized, at this time, the hydraulic oil pipe 6 is in the oil supply or oil suction state, the rotary joint can realize the oil path conduction in the rotating state, and the clamping and releasing are realized in the oil supply or oil suction process.

[0024] The left side of the pipe material disc 1 is provided with a push plate 10 corresponding to the upper material position, which pushes the pipe material 32 into the positioning port 24. The hydraulic cylinder drives the push plate 10 to move, and the push plate 10 pushes one end of the pipe material 32 into the positioning port 24, realizing the feeding process.

[0025] The circumferential side wall of the shaft shoulder disc 3 is provided with a first three-jaw chuck 8 corresponding to the plurality of positioning ports 24, which clamps the shaft shoulder 33 through the first three-jaw chuck 8.

[0026] The preheating pipe 2 is installed between the pipe material disc 1 and the shaft shoulder disc 3 corresponding to the preheating position. The left side of the pipe material disc 1 is provided with an electromagnetic chuck 14 corresponding to the preheating position, which can push the end of the pipe material 32 into the preheating pipe 2. The electromagnetic chuck 14 can magnetically attract the pipe material 32, and the pipe material is pushed into the preheating pipe 2 by the hydraulic cylinder. The preheating pipe 2 adopts electromagnetic heating method to preheat the welding end and improve the welding efficiency.

[0027] The moving arm 31 is installed on the left side of the base 23. The top of the moving arm 31 is rotatably connected with an inner supporting arm 17. The inner supporting arm 17 is provided with an inner supporting mechanism which can support and abut the pipe material 32 from the inside. The inner supporting mechanism includes a pair of hydraulic expansion discs 16 installed at both ends of the inner supporting arm 17. The expansion ends of the pair of hydraulic expansion discs 16 are jointly provided with arc-shaped inner supporting plates 18. The left end of the inner supporting arm 17 is fixed with an end clamping seat 19. The side wall of the end clamping seat 19 is fixed with a rotating shaft 20 which is rotatably connected with the moving arm 31. The hydraulic pipeline of the hydraulic expansion disc 16 extends out of the rotating shaft and is connected with the pump oil pipe through a rotary joint. The moving arm 31 is provided with a motor 22. The output end of the motor 22 is connected with the rotating shaft 20 through a belt pulley assembly 21. The moving arm 31 drives the inner supporting arm 17 to insert into the pipe material 32. The inner supporting mechanism supports and abuts the pipe material 32 from the inside. The motor 22 is started to drive the rotating shaft 20 to rotate through the belt pulley assembly 21, and finally drives the pipe material 32 to rotate at high speed through the inner supporting arm 17. The roller 26 rolls, and the movement of the moving arm 31 and the moving seat 4 realizes the friction welding of the end.

[0028] The movement of the moving seat 4, the push plate 10, the electromagnetic chuck 14 and the moving arm 31 is realized by the hydraulic cylinder. After welding, the pipe material 32 is released by the second three-jaw chuck 25 and the inner supporting mechanism. The moving seat 4 moves, and the welded hollow motor shaft can be pulled out of the positioning port 24. The first three-jaw chuck 8 is released to realize the discharging.

[0029] In addition, the inner bottom of the pipe material groove 9 is provided with a pair of telescopic grooves 29, and a lifting seat 13 is elastically connected in the telescopic groove 29 through a spring 30. The inner bottom of the telescopic groove 29 is provided with an electromagnetic block 27, and the bottom of the lifting seat 13 is provided with a magnetic block 28 corresponding to the electromagnetic block 27. The left side of the pipe material disc 1 is provided with an electric contact head 15 electrically connected with the corresponding electromagnetic block 27. The support 11 is provided with an electric contact seat 12 matched with the electric contact head 15 at the corresponding feeding position. When the feeding position is turned to, the electric contact head 15 is in contact with the electric contact seat 12, the circuit is conducted, the electromagnetic block 27 works, the magnetic block 28 repels the electromagnetic block 27 in the opposite surface with the same pole, the spring 30 is compressed under the magnetic repulsion force, the lifting seat 13 is pushed out of the telescopic groove 29, and the pipe material 32 is lifted to align the center with the center of the positioning port 24, so that the pipe material 32 is conveniently pushed into the positioning port 24. In other positions, the lifting seat 13 is shrunk in the telescopic groove 29.

[0030] In the feeding position, the pipe material 32 is placed in the pipe material groove 9, the shaft shoulder 33 is clamped through the first three-jaw chuck 8, the push plate 10 pushes one end of the pipe material 32 into the positioning port 24, and the corresponding end of the pipe material 32 is clamped through the second three-jaw chuck 25. When the preheating position is turned to, the pipe material 32 is magnetically attracted by the electromagnetic suction disc 14, the welding end of the pipe material 32 is pushed into the preheating pipe 2, the welding end of the corresponding shaft shoulder 33 is brought into the preheating pipe 2 by the moving seat 4, the welding end is preheated, and after preheating, the welding position is turned to. The inner supporting arm 17 is inserted into the pipe material 32 by the moving arm 31, the inner supporting mechanism supports the pipe material 32 from the inside, and the clamping effect of the second three-jaw chuck 25 outside can be improved. The effect of clamping the longer pipe material 32 is improved, and the end part is prevented from shaking during the rotating process. The motor 22 is started, the rotating shaft 20 is driven to rotate through the belt pulley assembly 21, and finally the pipe material 32 is driven to rotate at high speed through the inner supporting arm 17. The roller 26 rolls, and the end part is frictionally welded by the advance of the moving arm 31 and the moving seat 4. After welding, the pipe material 32 is released by the second three-jaw chuck 25 and the inner supporting mechanism, and the moving seat 4 is moved. The welded hollow motor shaft can be pulled out, the first three-jaw chuck 8 is released, and the pipe material can be discharged. The continuous and automatic welding process can be realized, and the preheating setting improves the welding efficiency. The above only describes the preferred embodiments of the present application and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A composite forming process for cold heading and friction welding of hollow shafts, characterized in that, Includes the following steps: S1. Hot piercing of round steel: Round steel is formed into tubes with specific inner and outer diameters using a hot piercing process. S2, Pipe sawing: The pipe is cut into sections of specific lengths using a sawing process; S3. Straightening: The billet is straightened to improve dimensional accuracy and straightness. S4. Spheroidizing Annealing of Round Steel: The round steel billet is spheroidized annealed to improve the metal structure and reduce the hardness, which facilitates subsequent cold heading. S5. Phosphate Saponification: The billet is treated with phosphate saponification to reduce the friction between the billet and the mold during cold heading. S6, Cold heading end: Cold heading through hole and shoulder structure for round steel; S7. Friction welding: Friction welding is performed on the tube and the shoulder end using friction welding equipment; S8. Isothermal normalizing: The isothermal normalizing process is used to release the internal stress of cold heading and friction welding and improve the microstructure. S9. Rough turning and boring: rough turning of the outer diameter and boring of the inner diameter to remove the oxide scale from friction welding burrs and isothermal normalizing.

2. The cold heading and friction welding composite forming process for hollow shafts according to claim 1, characterized in that, The process parameters for S4 are: temperature 760±10℃, holding temperature for 2-3 hours, cooling with the furnace to about 500℃, and then air cooling.

3. The cold heading and friction welding composite forming process for hollow shafts according to claim 1, characterized in that, The process parameters for S8 are: first normalizing temperature 930±10℃, holding for 1.5h, second isothermal temperature 600-650℃, holding for 2h, followed by air cooling.

4. A friction welding device for hollow shafts, used to perform friction welding of the tube material and the shoulder end as described in claim 1, characterized in that, The device includes a base (23), on which a support (11) is fixedly installed. A pipe tray (1) is rotatably connected to the support (11). A movable seat (4) is also installed on the base (23). A shoulder plate (3) corresponding to the pipe tray (1) is rotatably connected to the top of the movable seat (4). The circumferential sidewall of the pipe tray (1) is provided with multiple pipe grooves (9) for placing pipes (32). The top of the pipe tray (1) is the loading position, the rear side is the preheating position, and the bottom is the welding position. A positioning port (24) is provided on the right side of the pipe groove (9). A clamping component is installed in the positioning port (24). A pipe tray (1) is installed on the left side corresponding to the loading position. There is a push plate (10) for pushing the tube (32) into the positioning port (24). The circumferential side wall of the shoulder plate (3) is equipped with a first three-jaw chuck (8) corresponding to the multiple positioning ports (24). A preheating tube (2) is installed at the preheating position between the tube plate (1) and the shoulder plate (3). An electromagnetic chuck (14) is installed on the left side of the tube plate (1) at the preheating position, which can push the end of the tube (32) into the preheating tube (2). A moving arm (31) is installed on the left side of the base (23). An inner support arm (17) is rotatably connected to the top of the moving arm (31). An inner support mechanism that can support and press the tube (32) from the inside is installed on the inner support arm (17).

5. The friction welding equipment for hollow shafts according to claim 4, characterized in that, The moving seat (4), push plate (10), electromagnetic chuck (14) and moving arm (31) are all driven by hydraulic cylinders.

6. The friction welding equipment for hollow shafts according to claim 4, characterized in that, The tube tray (1) and the shoulder tray (3) are both driven to rotate by the drive shaft (5), which is rotatably connected to the movable seat (4) and the support (11).

7. The friction welding equipment for hollow shafts according to claim 6, characterized in that, The clamping assembly is a second three-jaw chuck (25). The second three-jaw chuck (25) is installed in the positioning port (24). The three jaw ends of the second three-jaw chuck (25) are rotatably connected to rollers (26) that abut against the tube material (32). A hydraulic oil pipe (6) is installed at the center of the tube material plate (1) and the shoulder plate (3). One end of the hydraulic oil pipe (6) in the tube material plate (1) is connected to multiple second three-jaw chucks (25) through multiple branch pipes. One end of the hydraulic oil pipe (6) in the shoulder plate (3) is connected to multiple first three-jaw chucks (8) through multiple branch pipes. A solenoid valve (7) is installed in each branch pipe. The other end of the hydraulic oil pipe (6) extends out to the drive shaft (5) and is connected to the pump oil pipe through a rotary joint.

8. The friction welding equipment for hollow shafts according to claim 4, characterized in that, The inner support mechanism includes hydraulic expansion discs (16) installed at both ends of the inner support arm (17). The expansion ends of the pair of hydraulic expansion discs (16) are all equipped with arc-shaped inner support plates (18). An end bracket (19) is fixed to the left end of the inner support arm (17). A rotating shaft (20) is fixed to the side wall of the end bracket (19). The rotating shaft (20) is rotatably connected to the moving arm (31). The hydraulic pipeline of the hydraulic expansion disc (16) extends out of the rotating shaft and connects to the pump oil pipe through a rotary joint.

9. The friction welding equipment for hollow shafts according to claim 8, characterized in that, A motor (22) is installed on the movable arm (31), and the output end of the motor (22) is driven by the rotating shaft (20) through a pulley assembly (21).

10. The friction welding equipment for hollow shafts according to claim 4, characterized in that, The inner bottom of the tubular material trough (9) is provided with a pair of telescopic grooves (29). A support seat (13) is elastically connected to the telescopic groove (29) by a spring (30). An electromagnetic block (27) is installed at the inner bottom of the telescopic groove (29). A magnetic block (28) corresponding to the electromagnetic block (27) is installed at the bottom of the support seat (13). A connector (15) electrically connected to the corresponding electromagnetic block (27) is installed on the left side of the tubular material tray (1). A connector (12) adapted to the connector (15) is installed on the support (11) at the material loading position.

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