Low-frequency high-pressure linear friction welding device and welding method

Abstract

The low-frequency high-pressure linear friction welding device comprises a machine body, one inner side wall of the machine body is connected with a vibration mechanism, the vibration mechanism is connected with a clamping unit, the inner bottom face of the machine body is connected with a guide rail, the guide rail is slidably connected with a sliding table, the inner bottom face of the machine body is further connected with supporting frames, and the guide rail is arranged between the supporting frames; the top of the supporting frame is connected with an upsetting mechanism, the upsetting mechanism is further connected to the top end of the sliding table, one end of the upsetting mechanism is arranged opposite to the clamping unit, the other end of the upsetting mechanism is connected with the inner wall of the machine body, the upsetting mechanism is further connected with an oil supply mechanism, and the oil supply mechanism is arranged close to the machine body. The invention further discloses a welding method of the low-frequency high-pressure linear friction welding device. According to the invention, the vibration part and the upsetting part can be effectively combined together.

Description

Technical Field

[0001] The present invention belongs to the technical field of solid-phase welding devices, specifically relates to a linear friction welding device with low frequency and high pressure, and also relates to a welding method for this device. Background Art

[0002] As a solid-phase welding method, in the process of linear friction welding, the welding surfaces of the workpieces to be welded perform linear reciprocating motion along a specific direction under the action of axial pressure. The heat generated by friction and plastic deformation makes the metal at the welding end face reach a high-temperature viscoplastic state. In this state, with the help of upsetting pressure, the combination between atoms is promoted to form a high-quality welded joint. Compared with traditional welding methods, the power required by linear friction welding equipment is only 20% of that of traditional methods, which can significantly reduce energy consumption. This welding technology has been widely used in fields such as aerospace, automobile manufacturing, and machinery manufacturing. In the field of material connection, linear friction welding can achieve high-quality connection of the same and dissimilar metal materials such as steel materials, aluminum alloys, titanium alloys, and superalloys. In addition to metal materials, linear friction welding equipment can also be applied to the welding of non-metal materials such as plastics. In terms of the design of the equipment structure, it covers the design of vibration mechanisms, upsetting mechanisms, fixtures, etc., and factors such as stability, rigidity, and centering need to be fully considered to meet different welding requirements.

[0003] In the research field of linear friction welding equipment, it is a common phenomenon that researchers often study the vibration part and the upsetting part separately. This research method makes it difficult to achieve an organic and efficient combination of the vibration part and the upsetting part in actual applications, greatly restricting the improvement of the overall performance of linear friction welding equipment and its wide application in industrial production. For example, the Chinese patent "A novel linear friction welding device" with the publication number CN110587115A uses a double-cam unit to achieve linear vibration and adjusts the up-and-down linear vibration amplitude of the workpiece to be welded through a planetary phase-changing unit, so as to control the welding vibration amplitude. However, its design concept and overall structure do not fundamentally solve the problem of the coordinated work of the vibration and upsetting parts, and still cannot achieve a high degree of integration and efficient cooperation between the two in the actual welding process. Summary of the Invention

[0004] The purpose of the present invention is to provide a linear friction welding device with low frequency and high pressure, which solves the problem that it is difficult to achieve an organic and efficient combination of the vibration part and the upsetting part of the handling robot in the existing linear friction welding equipment.

[0005] Another purpose of the present invention is to provide a welding method for the linear friction welding device with low frequency and high pressure.

[0006] The technical solution adopted by the present invention is: a linear friction welding device with low frequency and high pressure, including a machine body. A vibration mechanism is connected to an inner side wall of the machine body. The vibration mechanism is connected to a clamping unit. A guide rail is connected to the inner bottom surface of the machine body. A sliding table is slidably connected to the guide rail. A support frame is also connected to the inner bottom surface of the machine body. The guide rail is arranged between the support frames. The top forging mechanism is connected to the top of the support frame. The top forging mechanism is also connected to the top end of the sliding table. One end of the top forging mechanism is arranged opposite to the clamping unit. The other end of the top forging mechanism is connected to the inner wall of the machine body. The top forging mechanism is also connected to an oil supply mechanism, and the oil supply mechanism is arranged close to the machine body.

[0007] The characteristics of the present invention also lie in that The vibration mechanism includes a first box body and a second box body connected by bolts. One side of the first box body is connected to the inner wall of the machine body. Two end covers arranged side by side are connected to the inner bottom surface of the first box body. Bushings are connected to the surfaces of the two end covers. Thrust ball bearings are connected inside the bushings. The inner rings of the two thrust ball bearings are respectively connected to a driving shaft and a driven shaft. Cam wheels are connected to the shafts of the driving shaft and the driven shaft through lock nuts. Synchronous belt pulleys are connected to the shafts of the driving shaft and the driven shaft. A synchronous belt is connected between the two synchronous belt pulleys. A vibration unit is also connected to the inner bottom surface of the first box body. The vibration unit is connected to the clamping unit. The vibration unit is arranged between the two cam wheels. The bottom end of the driving shaft passes through the end cover and the bottom of the first box body and is connected to a reduction motor, and the reduction motor is connected to the inner bottom surface of the machine body.

[0008] The vibration unit includes a vibration support. The vibration support is arranged between the two cam wheels. The vibration support is connected to the side wall of the first box body. One end of the vibration support far from the first box body is connected to a fixing plate. A transmission component is connected to the plate surface of the fixing plate opposite to the first box body. The side of the fixing plate far from the first box body is connected to the clamping unit.

[0009] The transmission component includes a bracket. One end of the bracket is connected to the fixing plate. A bearing is connected to the end of the bracket far from the fixing plate. The outer ring of the bearing is connected to a vibration wheel, and the vibration wheel contacts the cam wheel.

[0010] The numbers of the vibration supports and the brackets are both set to two. The two vibration supports are connected side by side to the inner wall of the first box body. The two vibration supports are arranged between the two brackets. The two vibration wheels are in one-to-one contact with the two cam wheels.

[0011] The clamping unit includes a first clamp. The first clamp is connected to the plate surface of the fixing plate. The first clamp is arranged opposite to the top forging mechanism.

[0012] The upsetting mechanism includes a rough forging oil cylinder. One end of the rough forging oil cylinder is connected to the inner wall of the machine body. The rough forging oil cylinder is connected to the oil supply mechanism. The cylinder body of the rough forging oil cylinder is connected to the support frame. A fine forging oil cylinder is connected inside the rough forging oil cylinder. An oil inlet is provided at the end of the fine forging oil cylinder arranged inside the rough forging oil cylinder. The piston rod of the fine forging oil cylinder is connected to the sliding table. A second fixture is connected to the end of the piston rod. The second fixture is arranged opposite to the first fixture.

[0013] The oil supply mechanism includes an oil tank. The oil tank is arranged close to one side of the machine body. An AC motor is connected to the top of the oil tank. The AC motor is connected to a vane pump. The vane pump is arranged inside the oil tank. The vane pump is connected to an oil filter through a pipeline. The top of the oil filter is connected to the top of the oil tank. An overflow valve and a three-position four-way solenoid valve are connected to the top of the oil tank. Both the overflow valve and the three-position four-way solenoid valve are connected to the oil filter through pipelines. The overflow valve is also connected to a return pipe. The end of the return pipe is arranged inside the oil tank. The three-position four-way solenoid valve is connected to the rough forging oil cylinder through a pipeline.

[0014] An accumulator is also connected to the top of the oil tank. The accumulator is connected to the three-position four-way solenoid valve, the overflow valve and the oil filter respectively through pipelines. A fan is connected to the side wall of the oil tank. An air filter is connected to the top of the oil tank. The air filter is arranged inside the oil tank.

[0015] Another technical solution adopted by the present invention is a welding method of a linear friction welding device with low frequency and high pressure, which is specifically implemented according to the following steps: Step 1. The first fixture and the second fixture respectively clamp the workpiece to be welded. The reduction motor is started to drive the driving shaft to rotate, and then drive the driven shaft to rotate. The cam rotates accordingly and collides with the vibration wheel to generate vibration, driving the workpiece to be welded to vibrate. Step 2. The oil in the oil tank is pumped into the rough forging oil cylinder, and the sliding table is pushed to slide along the guide rail through the fine forging oil cylinder. When the fine forging oil cylinder reaches the limit position, the oil enters the fine forging oil cylinder, and the sliding table is continuously pushed to slide by the piston rod until the welding position. Step 3. Welding operation is carried out after the two workpieces to be welded are in contact.

[0016] The beneficial effects of the present invention are: The linear friction welding device with low frequency and high pressure of the present invention clamps the workpieces to be welded by the vibration fixture and the upsetting fixture respectively. The workpiece is sent to the vibration fixture by the upsetting oil cylinder to make the welding surfaces of the workpieces to be welded in contact. Then, the vibration unit makes the vibration fixture vibrate up and down, so that the welding surfaces of the two workpieces to be welded generate plastic flow. Then, the position is adjusted by the vibration unit to align the welding surfaces of the two workpieces to be welded. Finally, pressure is applied by the upsetting oil cylinder, so that the two workpieces to be welded are welded together, effectively combining the vibration part and the upsetting part. Description of the Drawings

[0017] Figure 1It is a partial structural schematic diagram of the linear friction welding device with low frequency and high pressure of the present invention; Figure 2 It is a partial front view of the linear friction welding device with low frequency and high pressure of the present invention; Figure 3 It is a sectional view of the vibration mechanism in the linear friction welding device with low frequency and high pressure of the present invention; Figure 4 It is a structural schematic diagram of the vibration mechanism in the linear friction welding device with low frequency and high pressure of the present invention; Figure 5 It is a structural schematic diagram of the upsetting mechanism in the linear friction welding device with low frequency and high pressure of the present invention; Figure 6 It is a structural schematic diagram of the oil supply mechanism in the linear friction welding device with low frequency and high pressure of the present invention; Figure 7 It is a schematic diagram of the pipeline connection mechanism in the oil supply mechanism of the linear friction welding device with low frequency and high pressure of the present invention.

[0018] In the figure, 1. Machine body, 2. Vibration mechanism, 21. End cover, 22. Deep groove ball bearing, 23. Bush, 24. Thrust ball bearing, 25. Driven shaft, 26. Cam, 27. Locking nut, 28. Synchronous belt pulley, 29. Synchronous belt, 210. First box body, 211. Second box body, 212. Vibration wheel, 213. Bearing, 214. Bracket, 215. Vibration support, 216. Driving shaft, 217. Fixed plate, 218. Reducing motor, 3. Guide rail, 31. Oil tank, 32. Fan, 33. Accumulator, 34. Oil filter, 35. AC motor, 36. Flange, 37. Relief valve, 38. Three-position four-way solenoid valve, 39. Air filter, 4. Workpiece, 5. Second fixture, 6. Slide table, 7. Support frame, 8. Upsetting mechanism, 81. Piston rod, 82. Precision forging oil cylinder, 83. Piston, 84. Oil inlet, 85. Rough forging oil cylinder, 9. First fixture. Specific embodiments

[0019] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] The present invention provides a linear friction welding device with low frequency and high pressure, as Figure 1-2As shown in the figure, it includes a machine body 1. A vibration mechanism 2 is connected to an inner side wall of the machine body 1. The vibration mechanism 2 is connected to a clamping unit. A guide rail 3 is connected to the inner bottom surface of the machine body 1. A slide table 6 is slidably connected to the guide rail 3. A support frame 7 is also connected to the inner bottom surface of the machine body 1. The guide rail 3 is arranged between the support frames 7. A upsetting mechanism 8 is connected to the top of the support frame 7. The upsetting mechanism 8 is also connected to the top end of the slide table 6. One end of the upsetting mechanism 8 is arranged opposite to the clamping unit. The other end of the upsetting mechanism 8 is connected to the inner wall of the machine body 1. The upsetting mechanism 8 is also connected to an oil supply mechanism, and the oil supply mechanism is arranged close to the machine body 1. The clamping unit and the upsetting mechanism 8 respectively fix the workpieces 4 to be welded. The oil supply mechanism supplies oil to the upsetting mechanism 8, pushing the slide table 6 to slide leftward along the guide rail 3. When the two workpieces 4 approach and contact each other, the vibration mechanism 2 is started, and at the same time, with the upsetting force provided by the upsetting mechanism 8, low-temperature welding is performed on the contact surfaces of the two workpieces.

[0021] Embodiment 1 A linear friction welding device with low frequency and high pressure, including a machine body 1. A vibration mechanism 2 is connected to an inner side wall of the machine body 1. The vibration mechanism 2 is connected to a clamping unit. A guide rail 3 is connected to the inner bottom surface of the machine body 1. A slide table 6 is slidably connected to the guide rail 3. A support frame 7 is also connected to the inner bottom surface of the machine body 1. The guide rail 3 is arranged between the support frames 7. A upsetting mechanism 8 is connected to the top of the support frame 7. The upsetting mechanism 8 is also connected to the top end of the slide table 6. One end of the upsetting mechanism 8 is arranged opposite to the clamping unit. The other end of the upsetting mechanism 8 is connected to the inner wall of the machine body 1. The upsetting mechanism 8 is also connected to an oil supply mechanism, and the oil supply mechanism is arranged close to the machine body 1.

[0022] Such as Figure 3-4As shown in the figure, the vibration mechanism 2 includes a first box body 210 and a second box body 211 connected by bolts. One side of the first box body 210 is connected to the inner wall of the machine body 1. Two end covers 21 arranged side by side are connected to the inner bottom surface of the first box body 210. Bushings 23 are connected to the surfaces of the two end covers 21. Thrust ball bearings 24 are connected inside the bushings 23. The inner rings of the two thrust ball bearings 24 are respectively connected to a driving shaft 216 and a driven shaft 25. Cam 26 is connected to the shaft bodies of the driving shaft 216 and the driven shaft 25 through lock nuts 27. Synchronous belt pulleys 28 are connected to the shaft bodies of the driving shaft 216 and the driven shaft 25. A synchronous belt 29 is connected between the two synchronous belt pulleys 28. A vibration unit is also connected to the inner bottom surface of the first box body 210. The vibration unit is connected to the clamping unit. The vibration unit is arranged between the two cams 26. The bottom end of the driving shaft 216 passes through the end cover 21 and the bottom of the first box body 210 and is connected to a reduction motor 218. The reduction motor 218 is connected to the inner bottom surface of the machine body 1. A deep groove ball bearing 22 is also connected inside the bushing 23. The driving shaft 216 and the driven shaft 25 are respectively connected to the inner rings of the two deep groove ball bearings 22. The first box body 210 and the second box body 211 are connected into a complete box body. After the reduction motor 218 is started, it drives the driving shaft 216 to rotate. The driving shaft 216 drives the driven shaft 25 to rotate through the synchronous belt 29. The driving shaft 216 and the driven shaft 25 rotate simultaneously, respectively driving the cams 26 on their respective shaft bodies to rotate. The cross-section of the cam 26 is similar to an ellipse, and the installation angles of the two cams 26 are offset. During the rotation of the two cams 26, when one cam 26 contacts the vibration unit, the other cam 26 does not contact the vibration unit, and the vibration unit can be continuously collided to generate a vibration effect.

[0023] Embodiment 2 A linear friction welding device with low frequency and high pressure includes a machine body 1. A vibration mechanism 2 is connected to an inner side wall of the machine body 1. The vibration mechanism 2 is connected to a clamping unit. A guide rail 3 is connected to the inner bottom surface of the machine body 1. A slide table 6 is slidably connected to the guide rail 3. A support frame 7 is also connected to the inner bottom surface of the machine body 1. The guide rail 3 is arranged between the support frames 7. A upsetting mechanism 8 is connected to the top of the support frame 7. The upsetting mechanism 8 is also connected to the top end of the slide table 6. One end of the upsetting mechanism 8 is arranged opposite to the clamping unit. The other end of the upsetting mechanism 8 is connected to the inner wall of the machine body 1. The upsetting mechanism 8 is also connected to an oil supply mechanism. The oil supply mechanism is arranged close to the machine body 1.

[0024] The vibration mechanism 2 includes a first box body 210 and a second box body 211 connected by bolts. One side of the first box body 210 is connected to the inner wall of the machine body 1. Two end covers 21 arranged side by side are connected to the inner bottom surface of the first box body 210. Bushings 23 are connected to the surfaces of the two end covers 21. Thrust ball bearings 24 are connected inside the bushings 23. The inner rings of the two thrust ball bearings 24 are respectively connected to a driving shaft 216 and a driven shaft 25. Cam 26 is connected to the shaft bodies of the driving shaft 216 and the driven shaft 25 through lock nuts 27. Synchronous belt pulleys 28 are connected to the shaft bodies of the driving shaft 216 and the driven shaft 25. A synchronous belt 29 is connected between the two synchronous belt pulleys 28. A vibration unit is also connected to the inner bottom surface of the first box body 210. The vibration unit is connected to the clamping unit. The vibration unit is arranged between the two cams 26. The bottom end of the driving shaft 216 passes through the end cover 21 and the bottom of the first box body 210 and is connected to a reduction motor 218. The reduction motor 218 is connected to the inner bottom surface of the machine body 1.

[0025] The vibration unit includes a vibration support 215. The vibration support 215 is arranged between the two cams 26. The vibration support 215 is connected to the side wall of the first box body 210. One end of the vibration support 215 away from the first box body 210 is connected to a fixing plate 217. A transmission component is connected to the plate surface of the fixing plate 217 opposite to the first box body 210. The side of the fixing plate 217 away from the first box body 210 is connected to the clamping unit. A through hole is provided on the side wall of the second box body 211 to facilitate the vibration support 215 to pass through. The fixing plate 217 is arranged outside the second box body 211. During the rotation of the two cams 26, they cooperate with each other and continuously contact the transmission component.

[0026] Embodiment 3 A linear friction welding device with low frequency and high pressure includes a machine body 1. A vibration mechanism 2 is connected to one inner side wall of the machine body 1. The vibration mechanism 2 is connected to a clamping unit. A guide rail 3 is connected to the inner bottom surface of the machine body 1. A sliding table 6 is slidably connected to the guide rail 3. A support frame 7 is also connected to the inner bottom surface of the machine body 1. The guide rail 3 is arranged between the support frames 7. A upsetting mechanism 8 is connected to the top of the support frame 7. The upsetting mechanism 8 is also connected to the top end of the sliding table 6. One end of the upsetting mechanism 8 is arranged opposite to the clamping unit. The other end of the upsetting mechanism 8 is connected to the inner wall of the machine body 1. The upsetting mechanism 8 is also connected to an oil supply mechanism. The oil supply mechanism is arranged close to the machine body 1.

[0027] The vibration mechanism 2 includes a first box body 210 and a second box body 211 connected by bolts. One side of the first box body 210 is connected to the inner wall of the machine body 1. Two end covers 21 arranged side by side are connected to the inner bottom surface of the first box body 210. Bushings 23 are connected to the surfaces of the two end covers 21. Thrust ball bearings 24 are connected inside the bushings 23. The inner rings of the two thrust ball bearings 24 are respectively connected to a driving shaft 216 and a driven shaft 25. Cam 26 is connected to the shaft bodies of the driving shaft 216 and the driven shaft 25 through lock nuts 27. Synchronous belt pulleys 28 are connected to the shaft bodies of the driving shaft 216 and the driven shaft 25. A synchronous belt 29 is connected between the two synchronous belt pulleys 28. A vibration unit is also connected to the inner bottom surface of the first box body 210. The vibration unit is connected to the clamping unit. The vibration unit is arranged between the two cams 26. The bottom end of the driving shaft 216 passes through the end cover 21 and the bottom of the first box body 210 and is connected to a reduction motor 218. The reduction motor 218 is connected to the inner bottom surface of the machine body 1.

[0028] The vibration unit includes a vibration support 215. The vibration support 215 is arranged between the two cams 26. The vibration support 215 is connected to the side wall of the first box body 210. One end of the vibration support 215 away from the first box body 210 is connected to a fixing plate 217. A transmission component is connected to the plate surface of the fixing plate 217 opposite to the first box body 210. The side of the fixing plate 217 away from the first box body 210 is connected to the clamping unit.

[0029] The transmission component includes a bracket 214. One end of the bracket 214 is connected to the fixing plate 217. A bearing 213 is connected to the end of the bracket 214 away from the fixing plate 217. A vibration wheel 212 is connected to the outer ring of the bearing 213. The vibration wheel 212 contacts the cam 26.

[0030] The numbers of the vibration supports 215 and the brackets 214 are both set to two. The two vibration supports 215 are connected side by side to the inner wall of the first box body 210. The two vibration supports 215 are arranged between the two brackets 214. The two vibration wheels 212 are in one-to-one contact with the two cams 26. The two cams 26 are respectively in contact with the two vibration wheels 212. When one cam 26 contacts the vibration wheel 212, the other cam 26 is not in contact with the vibration wheel 212. When the cam 26 contacts and collides with the vibration wheel 212, the vibration wheel 212 transmits the collision force to the fixing plate 217 through the bracket 214. The fixing plate 217 drives the workpiece 4 to vibrate.

[0031] The clamping unit includes a first clamp 9. The first clamp 9 is connected to the plate surface of the fixing plate 217. The first clamp 9 is arranged opposite to the upsetting mechanism 8. The first clamp 9 clamps the workpiece 4 to be welded.

[0032] Embodiment 4 A linear friction welding device with low frequency and high pressure, comprising a machine body 1. A vibration mechanism 2 is connected to an inner side wall of the machine body 1. The vibration mechanism 2 is connected to a clamping unit. A guide rail 3 is connected to the inner bottom surface of the machine body 1. A slide table 6 is slidably connected to the guide rail 3. A support frame 7 is further connected to the inner bottom surface of the machine body 1. The guide rail 3 is arranged between the support frames 7. A upsetting mechanism 8 is connected to the top of the support frame 7. The upsetting mechanism 8 is further connected to the top end of the slide table 6. One end of the upsetting mechanism 8 is arranged opposite to the clamping unit. The other end of the upsetting mechanism 8 is connected to the inner wall of the machine body 1. The upsetting mechanism 8 is further connected to an oil supply mechanism, and the oil supply mechanism is arranged close to the machine body 1.

[0033] The vibration mechanism 2 includes a first box body 210 and a second box body 211 connected by bolts. One side of the first box body 210 is connected to the inner wall of the machine body 1. Two end covers 21 arranged side by side are connected to the inner bottom surface of the first box body 210. Bushings 23 are connected to the surfaces of the two end covers 21. Thrust ball bearings 24 are connected inside the bushings 23. The inner rings of the two thrust ball bearings 24 are respectively connected to a driving shaft 216 and a driven shaft 25. Cam 26 is connected to the shaft bodies of the driving shaft 216 and the driven shaft 25 through lock nuts 27. Synchronous belt pulleys 28 are connected to the shaft bodies of the driving shaft 216 and the driven shaft 25. A synchronous belt 29 is connected between the two synchronous belt pulleys 28. A vibration unit is further connected to the inner bottom surface of the first box body 210. The vibration unit is connected to the clamping unit. The vibration unit is arranged between the two cams 26. The bottom end of the driving shaft 216 passes through the end cover 21 and the bottom of the first box body 210 and is connected to a reduction motor 218, and the reduction motor 218 is connected to the inner bottom surface of the machine body 1.

[0034] The vibration unit includes a vibration support 215. The vibration support 215 is arranged between the two cams 26. The vibration support 215 is connected to the side wall of the first box body 210. One end of the vibration support 215 away from the first box body 210 is connected to a fixing plate 217. A transmission component is connected to the plate surface of the fixing plate 217 opposite to the first box body 210. The side of the fixing plate 217 away from the first box body 210 is connected to the clamping unit.

[0035] The transmission component includes a bracket 214. One end of the bracket 214 is connected to the fixing plate 217. A bearing 213 is connected to the end of the bracket 214 away from the fixing plate 217. A vibration wheel 212 is connected to the outer ring of the bearing 213. The vibration wheel 212 contacts the cam 26.

[0036] The numbers of the vibration supports 215 and the brackets 214 are both set to two. The two vibration supports 215 are connected side by side to the inner wall of the first box body 210. The two vibration supports 215 are arranged between the two brackets 214. The two vibration wheels 212 are in one-to-one contact with the two cams 26.

[0037] The clamping unit includes a first clamp 9, the first clamp 9 is connected to the plate surface of the fixed plate 217, and the first clamp 9 is arranged opposite to the upsetting mechanism 8.

[0038] As Figure 5 shown, the upsetting mechanism 8 includes a rough upsetting oil cylinder 85. One end of the rough upsetting oil cylinder 85 is connected to the inner wall of the machine body 1. The rough upsetting oil cylinder 85 is connected to the oil supply mechanism. The cylinder body of the rough upsetting oil cylinder 85 is connected to the support frame 7. A fine upsetting oil cylinder 82 is connected inside the rough upsetting oil cylinder 85. An oil inlet 84 is provided at the end of the fine upsetting oil cylinder 82 arranged inside the rough upsetting oil cylinder 85. The piston rod 81 of the fine upsetting oil cylinder 82 is connected to the sliding table 6. A second clamp 5 is connected to the end of the piston rod 81. The second clamp 5 is arranged opposite to the first clamp 9. The stroke of the rough upsetting oil cylinder 85 is greater than that of the fine upsetting oil cylinder 82. When the hydraulic oil of the oil supply mechanism enters the cavity from the right side of the rough upsetting oil cylinder 85, due to the surface area difference between the left and right surfaces, the fine upsetting oil cylinder 82 is pushed to move quickly to the left, that is, the sliding table 6 is driven to slide to the left. When the fine upsetting oil cylinder 82 moves to the limit position, the oil outlet of the rough upsetting oil cylinder 85 stops discharging oil. Subsequently, oil is continuously supplied to the oil inlet of the rough upsetting oil cylinder 85. The oil liquid enters the fine upsetting oil cylinder 82 from the oil inlet 84 of the fine upsetting oil cylinder 82. Due to the pressure difference, the piston rod 81 of the piston 83 is pushed to continue moving to the left (the sliding table 6 moves to the left), so that the piston rod 81 reaches the specified position for welding, realizing hierarchical adjustment and hierarchical pressure application.

[0039] Example 5 A linear friction welding device with low frequency and high pressure includes a machine body 1. A vibration mechanism 2 is connected to an inner side wall of the machine body 1. The vibration mechanism 2 is connected to a clamping unit. A guide rail 3 is connected to the inner bottom surface of the machine body 1. A sliding table 6 is slidably connected to the guide rail 3. A support frame 7 is further connected to the inner bottom surface of the machine body 1. The guide rail 3 is arranged between the support frames 7. The top of the support frame 7 is connected to an upsetting mechanism 8. The upsetting mechanism 8 is further connected to the top end of the sliding table 6. One end of the upsetting mechanism 8 is arranged opposite to the clamping unit. The other end of the upsetting mechanism 8 is connected to the inner wall of the machine body 1. The upsetting mechanism 8 is further connected to an oil supply mechanism. The oil supply mechanism is arranged close to the machine body 1.

[0040] The vibration mechanism 2 includes a first box body 210 and a second box body 211 connected by bolts. One side of the first box body 210 is connected to the inner wall of the machine body 1. Two end covers 21 arranged side by side are connected to the inner bottom surface of the first box body 210. Bushings 23 are connected to the surfaces of the two end covers 21. Thrust ball bearings 24 are connected inside the bushings 23. The inner rings of the two thrust ball bearings 24 are respectively connected to a driving shaft 216 and a driven shaft 25. Cam 26 is connected to the shaft bodies of the driving shaft 216 and the driven shaft 25 through lock nuts 27. Synchronous belt pulleys 28 are connected to the shaft bodies of the driving shaft 216 and the driven shaft 25. A synchronous belt 29 is connected between the two synchronous belt pulleys 28. A vibration unit is also connected to the inner bottom surface of the first box body 210. The vibration unit is connected to the clamping unit. The vibration unit is arranged between the two cams 26. The bottom end of the driving shaft 216 passes through the end cover 21 and the bottom of the first box body 210 and is connected to a reduction motor 218. The reduction motor 218 is connected to the inner bottom surface of the machine body 1.

[0041] The vibration unit includes a vibration support 215. The vibration support 215 is arranged between the two cams 26. The vibration support 215 is connected to the side wall of the first box body 210. One end of the vibration support 215 away from the first box body 210 is connected to a fixing plate 217. A transmission component is connected to the plate surface of the fixing plate 217 opposite to the first box body 210. The side of the fixing plate 217 away from the first box body 210 is connected to the clamping unit.

[0042] The transmission component includes a bracket 214. One end of the bracket 214 is connected to the fixing plate 217. A bearing 213 is connected to the end of the bracket 214 away from the fixing plate 217. A vibration wheel 212 is connected to the outer ring of the bearing 213. The vibration wheel 212 contacts the cam 26.

[0043] The numbers of the vibration supports 215 and the brackets 214 are both set to two. The two vibration supports 215 are connected side by side to the inner wall of the first box body 210. The two vibration supports 215 are arranged between the two brackets 214. The two vibration wheels 212 are in one-to-one contact with the two cams 26.

[0044] The clamping unit includes a first clamp 9. The first clamp 9 is connected to the plate surface of the fixing plate 217. The first clamp 9 is arranged opposite to the upsetting mechanism 8.

[0045] The upsetting mechanism 8 includes a rough forging oil cylinder 85. One end of the rough forging oil cylinder 85 is connected to the inner wall of the machine body 1. The rough forging oil cylinder 85 is connected to the oil supply mechanism. The cylinder body of the rough forging oil cylinder 85 is connected to the support frame 7. A fine forging oil cylinder 82 is connected inside the rough forging oil cylinder 85. An oil inlet 84 is opened at the end of the fine forging oil cylinder 82 arranged inside the rough forging oil cylinder 85. The piston rod 81 of the fine forging oil cylinder 82 is connected to the sliding table 6. The end of the piston rod 81 is connected to a second clamp 5. The second clamp 5 is arranged opposite to the first clamp 9.

[0046] Such asFigure 6-7 As shown in Figure 6-7 , the oil supply mechanism includes an oil tank 31, which is arranged close to one side of the machine body 1. An AC motor 35 is connected to the top of the oil tank 31. The AC motor 35 is connected with a vane pump. The vane pump is arranged in the oil tank 31. The vane pump is connected with an oil filter 34 through a pipeline. The top of the oil filter 34 is connected to the top of the oil tank 31. An overflow valve 37 and a three-position four-way solenoid valve 38 are connected to the top of the oil tank 31. Both the overflow valve 37 and the three-position four-way solenoid valve 38 are connected to the oil filter 34 through pipelines. The overflow valve 37 is also connected with a return pipe, and the end of the return pipe is arranged in the oil tank 31. The three-position four-way solenoid valve 38 is connected to the rough forging oil cylinder 85 through a pipeline. The vane pump is connected to the oil tank 31 through a flange 36. After the AC motor 35 is started, it drives the vane pump to operate. The vane pump is connected with a suction pipe and starts to suck oil from the oil tank 31. After the oil fluid is pumped into the oil filter 34 by the vane pump for filtration, it is controlled by the three-position four-way solenoid valve 38 to switch, and then enters the rough forging oil cylinder 85 to provide pressure for it.

[0047] An accumulator 33 is also connected to the top of the oil tank 31. The accumulator 33 is connected to the three-position four-way solenoid valve 38, the overflow valve 37 and the oil filter 34 respectively through pipelines. A fan 32 is connected to the side wall of the oil tank 31. An air filter 39 is connected to the top of the oil tank 31. The air filter 39 is arranged inside the oil tank 31. When the oil fluid pressure is insufficient, the oil fluid flowing out of the oil filter 34 enters the accumulator 33 for pressurization, is controlled by the three-position four-way solenoid valve 38 to switch, and then enters the rough forging oil cylinder 85. When the pressure of the accumulator 33 is too high after pressurization and exceeds the set value of the overflow valve 37, the overflow valve 37 opens, and the oil fluid flows into the oil tank 31 through the return pipe. The air filter 39 balances the air pressure and filters the air when the oil tank 31 sucks oil, and the fan 32 assists in heat dissipation to ensure that the oil fluid temperature is appropriate.

[0048] Example 6 The welding method of the linear friction welding device with low frequency and high pressure is specifically implemented according to the following steps: Step 1. The first fixture 9 and the second fixture 5 respectively clamp the workpiece 4 to be welded. The reduction motor is started to drive the driving shaft 216 to rotate, and then drive the driven shaft 25 to rotate. The cam 26 rotates accordingly and collides with the vibration wheel 212 to generate vibration, driving the workpiece 4 to be welded to vibrate; Step 2. The oil fluid in the oil tank 31 is pumped into the rough forging oil cylinder 85, and the sliding table 6 is pushed along the guide rail 3 by the precision forging oil cylinder 82. When the precision forging oil cylinder 82 reaches the limit position, the oil fluid enters the precision forging oil cylinder 82, and the sliding table 6 is continuously pushed by the piston rod 81 to slide until the welding position; Step 3. After the two workpieces 4 to be welded come into contact, welding operation is carried out.

[0049] The working principle of the linear friction welding device with low frequency and high pressure of the present invention is as follows: The first fixture 9 and the second fixture 5 respectively clamp the workpiece 4 to be welded. The hydraulic oil controlled by the three-position four-way solenoid valve 38 enters the cavity from the right side of the rough forging oil cylinder 85. Due to the surface area difference between the left and right surfaces, it pushes the fine forging oil cylinder 82 to move quickly to the left, that is, drives the slide table 6 to slide to the left. When the fine forging oil cylinder 82 moves to the limit position, the oil outlet of the rough forging oil cylinder 85 stops discharging oil. Subsequently, oil is continuously supplied to the oil inlet of the rough forging oil cylinder 85. The oil fluid enters the fine forging oil cylinder 82 from the oil inlet 84 of the fine forging oil cylinder 82. Due to the pressure difference, it pushes the piston rod 81 of the piston 83 to continue moving to the left (the slide table 6 moves to the left), so that the workpiece 4 clamped by the second fixture 5 contacts the workpiece 4 clamped by the first fixture 9. After the reduction motor 218 is started, it drives the main shaft 216 to rotate. The main shaft 216 drives the driven shaft 25 to rotate through the synchronous belt 29. The main shaft 216 and the driven shaft 25 rotate simultaneously, respectively driving the cams 26 on their respective shafts to rotate. The two cams 26 cooperate to continuously collide with the vibration wheel 212. The vibration wheel 212 transmits the collision force to the fixed plate 217 through the bracket 214. The fixed plate 217 drives the workpiece 4 to vibrate. Then, with the upsetting force provided by the oil cylinder, the contact surfaces of the two workpieces 4 are subjected to low-temperature welding.

[0050] The linear friction welding device with low frequency and high pressure of the present invention clamps the workpieces to be welded by the vibration fixture and the upsetting fixture respectively, sends the workpiece to the vibration fixture through the upsetting oil cylinder so that the welding surfaces of the workpieces to be welded are in contact, then makes the vibration fixture vibrate up and down through the vibration unit, so that the welding surfaces of the two workpieces to be welded generate plastic flow, then adjusts the position through the vibration unit to align the welding surfaces of the two workpieces to be welded, and finally applies pressure through the upsetting oil cylinder, so that the two workpieces to be welded are welded together, thus effectively combining the vibration part and the upsetting part together.

Claims

1. A linear friction welding device with low frequency and high pressure, characterized in that, It includes a machine body (1), a vibration mechanism (2) is connected to an inner side wall of the machine body (1), the vibration mechanism (2) is connected to a clamping unit, a guide rail (3) is connected to the inner bottom surface of the machine body (1), a slide table (6) is slidably connected to the guide rail (3), a support frame (7) is further connected to the inner bottom surface of the machine body (1), the guide rail (3) is arranged between the support frames (7), a upsetting mechanism (8) is connected to the top of the support frame (7), the upsetting mechanism (8) is further connected to the top end of the slide table (6), one end of the upsetting mechanism (8) is arranged opposite to the clamping unit, the other end of the upsetting mechanism (8) is connected to the inner wall of the machine body (1), and the upsetting mechanism (8) is further connected to an oil supply mechanism, and the oil supply mechanism is arranged close to the machine body (1).

2. The linear friction welding device with low frequency and high pressure according to claim 1, characterized in that The vibration mechanism (2) includes a first box body (210) and a second box body (211) connected by bolts. One side of the first box body (210) is connected to the inner wall of the machine body (1). Two end covers (21) arranged side by side are connected to the inner bottom surface of the first box body (210). Bushings (23) are connected to the surfaces of the two end covers (21). Thrust ball bearings (24) are connected inside the bushings (23). The inner rings of the two thrust ball bearings (24) are respectively connected to a driving shaft (216) and a driven shaft (25). Cam (26) are connected to the shafts of the driving shaft (216) and the driven shaft (25) through lock nuts (27). Synchronous belt wheels (28) are connected to the shafts of the driving shaft (216) and the driven shaft (25). A synchronous belt (29) is connected between the two synchronous belt wheels (28). A vibration unit is further connected to the inner bottom surface of the first box body (210). The vibration unit is connected to the clamping unit. The vibration unit is arranged between the two cams (26). The bottom end of the driving shaft (216) passes through the end cover (21) and the bottom of the first box body (210) and is connected to a reduction motor (218). The reduction motor (218) is connected to the inner bottom surface of the machine body (1).

3. The linear friction welding device with low frequency and high pressure according to claim 2, characterized in that, The vibration unit includes a vibration support (215). The vibration support (215) is arranged between the two cams (26). The vibration support (215) is connected to the side wall of the first box body (210). One end of the vibration support (215) away from the first box body (210) is connected to a fixing plate (217). A transmission component is connected to the plate surface of the fixing plate (217) opposite to the first box body (210). The side of the fixing plate (217) away from the first box body (210) is connected to the clamping unit.

4. The linear friction welding device with low frequency and high pressure according to claim 3, characterized in that, The transmission component includes a bracket (214). One end of the bracket (214) is connected to the fixing plate (217). A bearing (213) is connected to the end of the bracket (214) away from the fixing plate (217). A vibration wheel (212) is connected to the outer ring of the bearing (213). The vibration wheel (212) contacts the cam (26).

5. The linear friction welding device with low frequency and high pressure according to claim 3, characterized in that, The number of the vibration supports (215) and the brackets (214) is both set to two. The two vibration supports (215) are connected in parallel to the inner wall of the first box body (210). The two vibration supports (215) are arranged between the two brackets (214). The two vibration wheels (212) are in one-to-one contact with the two cams (26).

6. The linear friction welding device with low frequency and high pressure according to claim 3, characterized in that, The clamping unit includes a first clamp (9). The first clamp (9) is connected to the plate surface of the fixing plate (217). The first clamp (9) is arranged opposite to the upsetting mechanism (8).

7. The linear friction welding device with low frequency and high pressure according to claim 6, characterized in that, The upsetting mechanism (8) includes a rough forging oil cylinder (85). One end of the rough forging oil cylinder (85) is connected to the inner wall of the machine body (1). The rough forging oil cylinder (85) is connected to an oil supply mechanism. The cylinder body of the rough forging oil cylinder (85) is connected to the support frame (7). A fine forging oil cylinder (82) is connected inside the rough forging oil cylinder (85). An oil inlet (84) is arranged at the end of the fine forging oil cylinder (82) arranged inside the rough forging oil cylinder (85). The piston rod (81) of the fine forging oil cylinder (82) is connected to the sliding table (6). The end of the piston rod (81) is connected to a second clamp (5). The second clamp (5) is arranged opposite to the first clamp (9).

8. The linear friction welding device with low frequency and high pressure according to claim 7, characterized in that, The oil supply mechanism includes an oil tank (31). The oil tank (31) is arranged on one side close to the machine body (1). An AC motor (35) is connected to the top of the oil tank (31). The AC motor (35) is connected with a vane pump. The vane pump is arranged inside the oil tank (31). The vane pump is connected with an oil filter (34) through a pipeline. The top of the oil filter (34) is connected to the top of the oil tank (31). An overflow valve (37) and a three-position four-way solenoid valve (38) are connected to the top of the oil tank (31). The overflow valve (37) and the three-position four-way solenoid valve (38) are both connected to the oil filter (34) through pipelines. The overflow valve (37) is also connected with a return pipe. The end of the return pipe is arranged inside the oil tank (31). The three-position four-way solenoid valve (38) is connected to the rough forging oil cylinder (85) through a pipeline.

9. The linear friction welding device with low frequency and high pressure according to claim 8, characterized in that, An accumulator (33) is also connected to the top of the oil tank (31). The accumulator (33) is connected to the three-position four-way solenoid valve (38), the overflow valve (37) and the oil filter (34) through pipelines respectively. A fan (32) is connected to the side wall of the oil tank (31). An air filter (39) is connected to the top of the oil tank (31). The air filter (39) is arranged inside the oil tank (31).

10. The welding method of the linear friction welding device with low frequency and high pressure according to any one of claims 1-9, characterized in that, Specifically, it is implemented according to the following steps: Step 1. The first clamp (9) and the second clamp (5) respectively clamp the workpiece to be welded (4). Start the reduction motor to drive the rotation of the driving shaft (216), and then drive the rotation of the driven shaft (25). The cam (26) rotates accordingly, collides with the vibration wheel (212) to generate vibration, and drives the workpiece to be welded (4) to vibrate; Step 2. The oil in the fuel tank (31) is pumped into the rough forging oil cylinder (85), and the sliding table (6) is pushed along the guide rail (3) by the finish forging oil cylinder (82). After the finish forging oil cylinder (82) reaches the limit position, the oil enters the finish forging oil cylinder (82), and the sliding table (6) is continuously pushed by the piston rod (81) until the welding position is reached; Step 3. After the two workpieces to be welded (4) come into contact, welding operations are carried out.

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