Automobile frame welding positioning clamp and welding process

Abstract

The invention discloses an automobile frame welding positioning clamp and a welding process, and relates to the field of automobile frame welding, the automobile frame welding positioning clamp comprises a welding table top, four inner clamping mechanisms are mounted on the top surface of the welding table top, end clamping mechanisms are arranged at one ends of two of the inner clamping mechanisms, and the end clamping mechanisms are arranged at the other ends of the two of the inner clamping mechanisms; and an outer clamping mechanism is arranged on one side of the inner clamping mechanism. The corresponding number of jacking and pressing mechanisms are selected according to the actual shape of the frame to be inserted into the mounting plate of the linear driving mechanism, and the positions of the jacking and pressing mechanisms are adjusted, so that a fourth air cylinder controls a pressing rod to be accurately pressed and contacted outside the frame to be fixed; through the arrangement of the four linear driving mechanisms, a user can conveniently install the jacking and pressing mechanism according to needs, the jacking and pressing mechanism can be conveniently and rapidly disassembled and assembled through the insertion connection design, the device can adapt to the size and shape changes of vehicle frames of different vehicle types, the vehicle frames are stably positioned and clamped, the universality of the device is improved, and the welding machining cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of automobile frame welding, in particular to an automobile frame welding positioning fixture and a welding process. Background Art

[0002] In the field of automobile manufacturing, the frame is one of the core components of the car, and its quality and precision directly affect the performance and safety of the car. The car frame is usually composed of multiple parts, which need to be connected together by welding to form a solid whole. In order to ensure the accuracy and quality of the car frame during the welding process, welding positioning fixtures came into being. The main function of the welding positioning fixture is to position and clamp the various parts of the frame during the welding process to ensure the position accuracy and dimensional accuracy of the welded joint.

[0003] With the continuous development and progress of the automobile industry, the structure and shape of automobile frames are becoming more and more complex. The frame sizes and shapes of different models are different. Existing fixtures can often only be designed for specific models, and are not very universal. It is difficult to adapt to the changes in frame sizes and shapes of different models, which increases production costs. Summary of the invention

[0004] The purpose of the present invention is to provide a welding positioning fixture and welding process for an automobile frame, so as to solve the problem that the structure and shape of the automobile frame proposed in the above background technology are becoming more and more complicated, the frame sizes and shapes of different models are different, and the existing fixtures can often only be designed for specific models, with low versatility, and it is difficult to adapt to the changes in frame sizes and shapes of different models, thereby increasing production costs.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a kind of automobile frame welding positioning fixture, comprising a welding table, the top surface of the welding table is installed with an inner clamping mechanism, four inner clamping mechanisms are provided, two of which are provided with end clamping mechanisms at one end, and an outer clamping mechanism is provided on one side of the inner clamping mechanism, and the end clamping mechanism and the outer clamping mechanism are both installed on the top surface of the welding table, and one side of the other two inner clamping mechanisms is provided with a positioning baffle, the positioning baffle is fixedly connected to the top surface of the welding table, an adjustment groove is opened through the top surface of the welding table, a linear drive mechanism is provided below the adjustment groove, the linear drive mechanism comprises a servo motor, a movable groove plate, a screw rod, a threaded sleeve block and a mounting plate, the mounting plate is movably connected to the inner wall of the adjustment groove, and a top clamping mechanism is installed on the top surface of the mounting plate The cam is fixedly connected to the bottom surface of the welding table, the servo motor is fixedly installed at one end of the movable slot plate, a slide groove is provided on the top surface of the movable slot plate, the screw rod is rotatably connected to the inner wall of the slide groove, one end of the screw rod is fixedly connected to the output shaft end of the servo motor, the threaded sleeve is threadedly sleeved on the outer wall of the screw rod, the outer wall of the threaded sleeve is movably connected to the inner wall of the slide groove, the top surface of the threaded sleeve is fixedly connected to the bottom surface of the mounting plate, the top pressing mechanism comprises a support plate, a connecting base and a plug-in rod, the plug-in rod is fixedly connected to the bottom surface of the connecting base, the connecting base is fixedly connected to the bottom surface of the support plate, the top surface of the mounting plate is provided with a rotating groove, the inner wall of the rotating groove is rotatably connected with a plug-in block, the top surface of the plug-in block is provided with a slot, and the mounting plate is plugged into the inner wall of the slot.

[0006] Preferably, a limit slot is provided on the inner wall of the rotating groove, a clamping block is fixedly connected to the outer wall of the plug-in block, and the clamping block is movably connected to the limit slot.

[0007] Preferably, a cylinder four is installed on the lower outer wall of the support plate, one end of the telescopic rod of the cylinder four passes through the outer wall of the support plate and is rotatably connected to a traction rod, and the top end of the traction rod is fixedly connected to a pressure rod.

[0008] Preferably, a movable connecting rod is rotatably connected to the middle inner wall of the traction rod, and a fixed connecting plate is fixedly connected to the upper outer wall of the support plate, and the fixed connecting plate is rotatably connected to one end of the movable connecting rod.

[0009] Preferably, the end clamp mechanism includes a mounting block, a cylinder 1 and a frame pressure block, the mounting block is fixedly mounted on the top surface of the welding table, the cylinder 1 is fixedly connected to the outer wall of the mounting block, and the frame pressure block is fixedly connected to one end of the telescopic rod of the cylinder 1.

[0010] Preferably, the external clamping mechanism comprises a second cylinder, one end of a telescopic rod of the second cylinder is fixedly connected to a pressure plate, and the bottom surface of the second cylinder is fixedly connected to the top surface of the welding table.

[0011] Preferably, the inner clamping mechanism comprises a bottom plate, a top surface of the bottom plate is provided with a connecting guide groove, and an inner wall of the connecting guide groove is installed with a cylinder three.

[0012] Preferably, one end of the telescopic rod of the cylinder three is fixedly connected to a limit block, and the bottom end of the limit block is movably connected to the inner wall of the connecting guide groove.

[0013] Preferably, an electric control box is provided on one side of the positioning baffle, and the electric control box is installed on the top surface of the welding table, and the four corners of the bottom surface of the welding table are fixedly connected with supporting feet.

[0014] A vehicle frame welding process comprises the following steps: S1. Clean the frame and preset welding parameters; S2, placing the frame member on the positioning baffle to limit the end position, and using the inner clamping mechanism on one side of the positioning baffle to clamp and fix the end; S3, then the remaining frame components are fixedly clamped on the welding table by using the end clamp mechanism, the outer clamp mechanism and the inner clamp mechanism in coordination, the position of the top pressing mechanism is adjusted by the linear drive mechanism, and the irregular edges of the frame are pressed and fixed by the top pressing mechanism; S4. After positioning and clamping of the various components of the frame, automatic welding operation is performed according to the welding sequence and welding parameters; S5. Clean and treat the surface impurities of the welded frame and perform non-destructive testing on the welded joints; S6. Finally, the welded frame is heat treated and the finished frame is subjected to a comprehensive quality inspection.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, a corresponding number of pressing mechanisms and mounting plates of the linear drive mechanism are selected for plug-in installation according to the actual shape of the frame, and the servo motor is controlled to drive the threaded sleeve to rotate and adjust the mounting plate to move and adjust the position in the adjustment groove, thereby adjusting the position of the pressing mechanism, so that the four control pressing rods of the cylinder are accurately pressed and fixed on the outside of the frame. The arrangement of four groups of linear drive mechanisms facilitates the user to install the pressing mechanism as needed, and the plug-in design facilitates the rapid disassembly and assembly of the pressing mechanism, so that the present invention can adapt to the changes in frame size and shape of different vehicle models, firmly position and clamp the frame, improve the versatility of the device, and reduce the welding processing cost.

[0016] 2. In the present invention, by rotating the plug-in block in the rotating groove and cooperating with the clamping block and the limit clamping groove, the top pressing mechanism can be rotated and adjusted after installation, the pressing direction of the pressure rod can be controlled, and precise clamping of irregular parts of the frame can be provided.

[0017] 3. In the present invention, the support and limitation of the inner wall of the frame end is achieved by pushing the limit block by the third cylinder, and the frame pressure block is pushed by the first cylinder to clamp and fix the outer wall of the frame, and the pressure plate is pushed by the second cylinder to further clamp the side, thereby improving the clamping stability of the frame by the device, improving the stable clamping force, avoiding displacement of the frame during welding, and improving the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of a welding positioning fixture for an automobile frame of the present invention; Figure 2 It is a side structural schematic diagram of a welding positioning fixture for an automobile frame of the present invention; Figure 3 This is a structural schematic diagram of a linear drive mechanism of a welding positioning fixture for an automobile frame of the present invention; Figure 4 It is a partial structural schematic diagram of a welding positioning fixture for an automobile frame of the present invention; Figure 5 This is a schematic diagram of the internal structure of a movable slot plate of a welding positioning fixture for an automobile frame of the present invention; Figure 6 It is a structural schematic diagram of a top pressing mechanism and a mounting plate of a welding positioning fixture for an automobile frame of the present invention; Figure 7 The present invention is a schematic diagram of the internal structure of a mounting plate of a welding positioning fixture for an automobile frame.

[0019] In the figure: 1. welding table; 11. adjustment slot; 12. support foot; 2. end clamp mechanism; 21. mounting block; 22. cylinder 1; 23. frame pressure block; 3. outer clamp mechanism; 31. cylinder 2; 32. pressure plate; 4. inner clamp mechanism; 41. bottom plate; 42. cylinder 3; 43. limit block; 44. connecting guide groove; 5. top pressure mechanism; 51. support plate; 52. connecting base; 53. plug rod; 54 , cylinder four; 55, traction rod; 56, movable connecting rod; 57, pressure rod; 58, fixed connecting plate; 6, linear drive mechanism; 61, servo motor; 62, movable slot plate; 63, screw rod; 64, threaded sleeve block; 65, mounting plate; 651, plug-in block; 652, slot; 653, rotating slot; 654, limit card slot; 655, card block; 66, slide slot; 7, positioning baffle; 8, electric control box. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1: Reference Figure 1 - Figure 7 As shown: a welding positioning fixture for an automobile frame, comprising a welding table 1, an inner clamping mechanism 4 is installed on the top surface of the welding table 1, four inner clamping mechanisms 4 are provided, one end of two inner clamping mechanisms 4 are provided with an end clamping mechanism 2, one side of the inner clamping mechanism 4 is provided with an outer clamping mechanism 3, the end clamping mechanism 2 and the outer clamping mechanism 3 are both installed on the top surface of the welding table 1, and one side of the other two inner clamping mechanisms 4 is provided with a positioning baffle 7, the positioning baffle 7 is fixedly connected to the top surface of the welding table 1, an adjustment groove 11 is opened through the top surface of the welding table 1, a linear drive mechanism 6 is arranged below the adjustment groove 11, the linear drive mechanism 6 comprises a servo motor 61, a movable groove plate 62, a screw rod 63, a threaded sleeve block 64 and a mounting plate 65, the mounting plate 65 is movably connected to the inner wall of the adjustment groove 11, a top pressing mechanism 5 is installed on the top surface of the mounting plate 65, both ends of the movable groove plate 62 are fixedly connected to the bottom surface of the welding table 1, the servo motor 61 is fixedly installed at one end of the movable groove plate 62, and the movable The top surface of the groove plate 62 is provided with a slide groove 66, the screw rod 63 is rotatably connected to the inner wall of the slide groove 66, one end of the screw rod 63 is fixedly connected to the output shaft end of the servo motor 61, the threaded sleeve 64 is threadedly sleeved on the outer wall of the screw rod 63, the outer wall of the threaded sleeve 64 is movably connected to the inner wall of the slide groove 66, the top surface of the threaded sleeve 64 is fixedly connected to the bottom surface of the mounting plate 65, and the top pressing mechanism 5 includes a support plate 51, a connecting base 52 and a plug rod 53, and the plug rod 53 is fixedly connected to the connecting base 52 The bottom surface of the connecting base 52 is fixedly connected to the bottom surface of the supporting plate 51, the top surface of the mounting plate 65 is provided with a rotating groove 653, the inner wall of the rotating groove 653 is rotatably connected with a plug-in block 651, the top surface of the plug-in block 651 is provided with a slot 652, the mounting plate 65 is plugged into the inner wall of the slot 652, the inner wall of the rotating groove 653 is provided with a limiting card slot 654, the outer wall of the plug-in block 651 is fixedly connected with a card block 655, and the card block 655 and the limiting card slot 654 are movably connected.

[0022] In this embodiment, the frame assembly is placed on the inner clamping mechanism 4, the inner clamping mechanism 4 is controlled to push the inner side of the frame to cooperate with the end clamping mechanism 2 to clamp the end of the frame, and then the outer clamping mechanism 3 is used to further limit the side of the frame. According to the actual shape of the frame, the user selects a corresponding number of top pressing mechanisms 5 and the mounting plate 65 of the linear drive mechanism 6 for plug-in installation, and controls the servo motor 61 to drive the threaded sleeve block 64 to rotate and adjust the mounting plate 65 to move and adjust the position in the adjustment groove 11, thereby adjusting the position of the top pressing mechanism 5, so that the cylinder 4 54 controls the pressure rod 57 to accurately press The touch is fixed on the outside of the frame. The arrangement of four sets of linear drive mechanisms 6 makes it convenient for users to install the pressing mechanism 5 according to their needs. The plug-in design facilitates quick disassembly and assembly of the pressing mechanism 5, so that the present invention can adapt to the changes in frame size and shape of different models, firmly position and clamp the frame, and improve the versatility of the device. Through the rotation of the plug-in block 651 in the rotating groove 653, the card connection between the clamping block 655 and the limiting clamping groove 654 is coordinated, so that the pressing mechanism 5 can be rotated and adjusted after installation, and the pressing contact direction of the pressure rod 57 is controlled, so as to provide precise clamping of irregular parts of the frame.

[0023] Embodiment 2: Figure 1 - Figure 7 As shown, a cylinder 4 54 is installed on the lower outer wall of the support plate 51, one end of the telescopic rod of the cylinder 4 54 penetrates the outer wall of the support plate 51 and is rotatably connected to a traction rod 55, the top of the traction rod 55 is fixedly connected to a pressure rod 57, and the middle inner wall of the traction rod 55 is rotatably connected to a movable connecting rod 56, and the upper outer wall of the support plate 51 is fixedly connected to a fixed connecting plate 58, and the fixed connecting plate 58 is rotatably connected to one end of the movable connecting rod 56. The end clamping mechanism 2 includes a mounting block 21, a cylinder 1 22 and a frame pressing block 23, the mounting block 21 is fixedly installed on the top surface of the welding table 1, the cylinder 1 22 is fixedly connected to the outer wall of the mounting block 21, and the frame pressing block 23 is fixedly connected to At one end of the telescopic rod of cylinder one 22, the external clamping mechanism 3 includes cylinder two 31, one end of the telescopic rod of cylinder two 31 is fixedly connected with a pressure plate 32, the bottom surface of cylinder two 31 is fixedly connected with the top surface of the welding table 1, the internal clamping mechanism 4 includes a bottom plate 41, the top surface of the bottom plate 41 is provided with a connecting guide groove 44, the inner wall of the connecting guide groove 44 is installed with cylinder three 42, one end of the telescopic rod of cylinder three 42 is fixedly connected with a limit block 43, the bottom end of the limit block 43 is movably connected to the inner wall of the connecting guide groove 44, an electric control box 8 is arranged on one side of the positioning baffle 7, the electric control box 8 is installed on the top surface of the welding table 1, and the four corners of the bottom surface of the welding table 1 are fixedly connected with support feet 12.

[0024] In this embodiment, the bottom end of the traction rod 55 is pulled by the cylinder 4 54, and the limit pulling of the movable connecting rod 56 is cooperated to make the pressure rod 57 pressed down and contact with the surface of the frame, so as to firmly clamp the top of the frame, and the limit block 43 is pushed by the cylinder 3 42 to realize the support and limit of the inner wall of the frame end, and the frame pressure block 23 is pushed by the cylinder 1 22 to clamp and fix the outer wall of the frame, and the pressure plate 32 is pushed by the cylinder 2 31 to further clamp the side, thereby improving the clamping stability of the frame by the device, improving the stable clamping force, avoiding the displacement of the frame during welding, and improving the welding quality. Through the setting of the electric control box 8, it is convenient for the user to operate and control the various components of the device.

[0025] Embodiment 3: This embodiment provides a vehicle frame welding process, comprising the following steps: Step 1: Clean the frame and preset welding parameters; Step 2: Place the frame member on the positioning baffle 7 to limit the end position, and use the inner clamping mechanism 4 on one side of the positioning baffle 7 to clamp and fix the end; Step 3: Then, the remaining frame components are fixedly clamped on the welding table 1 by using the end clamping mechanism 2, the outer clamping mechanism 3 and the inner clamping mechanism 4 in cooperation with each other, and the position of the pressing mechanism 5 is adjusted by the linear drive mechanism 6, and the irregular edges of the frame are pressed and fixed by the pressing mechanism 5; Step 4: After positioning and clamping the various components of the frame, perform automatic welding operations according to the welding sequence and welding parameters; Step 5: Clean and treat the surface impurities of the welded frame and perform non-destructive testing on the welded joints; Step 6. Finally, heat treat the welded frame and conduct a comprehensive quality inspection on the finished frame.

[0026] The use method and working principle of the device are as follows: by placing the frame assembly on the inner clamping mechanism 4, the cylinder three 42 pushes the limit block 43 to achieve the support and limit of the inner wall of the frame end, the cylinder one 22 pushes the frame pressure block 23 to clamp and fix the outer wall of the frame, and the cylinder two 31 is used to push the pressure plate 32 to further clamp the side, thereby improving the clamping stability of the frame by the device, improving the stable clamping force, avoiding the displacement of the frame during the welding process, and improving the welding quality. According to the actual shape change of the frame, the corresponding number of top pressing mechanisms 5 and the mounting plate 65 of the linear drive mechanism 6 are selected for plug-in installation, and the servo motor 61 is controlled to drive the threaded sleeve block 64 to rotate and adjust the mounting plate 6 The position of the pressing mechanism 5 is adjusted by moving the position in the adjusting groove 11, so that the cylinder 54 controls the pressing rod 57 to accurately press and fix the pressing rod 57 on the outside of the frame. The four sets of linear drive mechanisms 6 are provided to facilitate the user to install the pressing mechanism 5 according to the needs. The plug-in design facilitates the quick disassembly and assembly of the pressing mechanism 5, so that the present invention can adapt to the changes in the frame size and shape of different models, and firmly position and clamp the frame. The plug-in block 651 rotates in the rotating groove 653, and the clamping between the clamping block 655 and the limiting clamping groove 654 is matched, so that the pressing mechanism 5 can be rotated and adjusted after installation, and the pressing direction of the pressing rod 57 is controlled, so as to provide accurate clamping of irregular parts of the frame.

[0027] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A welding positioning fixture for an automobile frame, comprising a welding table (1), characterized in that: The top surface of the welding table (1) is provided with an inner clamping mechanism (4), and four inner clamping mechanisms (4) are provided, wherein one end of two of the inner clamping mechanisms (4) is provided with an end clamping mechanism (2), and one side of the inner clamping mechanism (4) is provided with an outer clamping mechanism (3), and the end clamping mechanism (2) and the outer clamping mechanism (3) are both installed on the top surface of the welding table (1), and one side of the other two inner clamping mechanisms (4) is provided with a positioning baffle (7), and the positioning baffle (7) is fixedly connected to the top surface of the welding table (1). ) is provided with an adjustment groove (11) through the top surface thereof, a linear drive mechanism (6) is arranged below the adjustment groove (11), the linear drive mechanism (6) comprises a servo motor (61), a movable groove plate (62), a screw rod (63), a threaded sleeve block (64) and a mounting plate (65), the mounting plate (65) is movably connected to the inner wall of the adjustment groove (11), a top pressing mechanism (5) is installed on the top surface of the mounting plate (65), two ends of the movable groove plate (62) are fixedly connected to the bottom surface of the welding table (1), the servo motor (61) is fixedly mounted on one end of the movable groove plate (62), the top surface of the movable groove plate (62) is provided with a slide groove (66), the screw rod (63) is rotatably connected to the inner wall of the slide groove (66), one end of the screw rod (63) is fixedly connected to the output shaft end of the servo motor (61), the threaded sleeve (64) is threadedly sleeved on the outer wall of the screw rod (63), the outer wall of the threaded sleeve (64) is movably connected to the inner wall of the slide groove (66), the top surface of the threaded sleeve (64) is fixedly connected to the bottom surface of the mounting plate (65), and the top pressure The mechanism (5) comprises a support plate (51), a connecting base (52) and an insertion rod (53); the insertion rod (53) is fixedly connected to the bottom surface of the connecting base (52); the connecting base (52) is fixedly connected to the bottom surface of the support plate (51); a rotation groove (653) is provided on the top surface of the mounting plate (65); a plug-in block (651) is rotatably connected to the inner wall of the rotation groove (653); a slot (652) is provided on the top surface of the plug-in block (651); and the mounting plate (65) is plugged into the inner wall of the slot (652).

2. The automobile frame welding positioning fixture according to claim 1, characterized in that: The inner wall of the rotating groove (653) is provided with a limit clamping groove (654), and the outer wall of the plug-in block (651) is fixedly connected with a clamping block (655), and the clamping block (655) is movably clamped with the limit clamping groove (654).

3. The automobile frame welding positioning fixture according to claim 1, characterized in that: A cylinder four (54) is installed on the lower outer wall of the support plate (51), one end of the telescopic rod of the cylinder four (54) passes through the outer wall of the support plate (51) and is rotatably connected to a traction rod (55), and the top end of the traction rod (55) is fixedly connected to a pressure rod (57).

4. The automobile frame welding positioning fixture according to claim 3, characterized in that: A movable connecting rod (56) is rotatably connected to the middle inner wall of the traction rod (55), and a fixed connecting plate (58) is fixedly connected to the upper outer wall of the support plate (51). The fixed connecting plate (58) is rotatably connected to one end of the movable connecting rod (56).

5. The automobile frame welding positioning fixture according to claim 1, characterized in that: The end clamp mechanism (2) comprises a mounting block (21), a cylinder one (22) and a frame pressing block (23); the mounting block (21) is fixedly mounted on the top surface of the welding table (1); the cylinder one (22) is fixedly connected to the outer wall of the mounting block (21); and the frame pressing block (23) is fixedly connected to one end of the telescopic rod of the cylinder one (22).

6. The automobile frame welding positioning fixture according to claim 1, characterized in that: The external clamping mechanism (3) comprises a second cylinder (31), one end of a telescopic rod of the second cylinder (31) is fixedly connected to a pressing plate (32), and the bottom surface of the second cylinder (31) is fixedly connected to the top surface of the welding table (1).

7. The automobile frame welding positioning fixture according to claim 1, characterized in that: The inner clamping mechanism (4) comprises a bottom plate (41), a top surface of the bottom plate (41) is provided with a connecting guide groove (44), and an inner wall of the connecting guide groove (44) is provided with a cylinder three (42).

8. The automobile frame welding positioning fixture according to claim 7, characterized in that: One end of the telescopic rod of the cylinder three (42) is fixedly connected to a limit block (43), and the bottom end of the limit block (43) is movably connected to the inner wall of the connecting guide groove (44).

9. The automobile frame welding positioning fixture according to claim 7, characterized in that: An electric control box (8) is provided on one side of the positioning baffle (7), and the electric control box (8) is mounted on the top surface of the welding table (1), and support feet (12) are fixedly connected to the four corners of the bottom surface of the welding table (1).

10. A welding process for an automobile frame, characterized in that: Using the automobile frame welding positioning fixture according to any one of claims 1 to 9 comprises the following steps: S1. Clean the frame and preset welding parameters; S2, placing the vehicle frame component on the positioning baffle (7) to limit the end position, and using the inner clamping mechanism (4) on one side of the positioning baffle (7) to clamp and fix the end; S3, then using the end clamping mechanism (2), the outer clamping mechanism (3) and the inner clamping mechanism (4) in coordination to fix and clamp the remaining vehicle frame components on the welding table (1), adjusting the position of the top pressing mechanism (5) through the linear drive mechanism (6), and using the top pressing mechanism (5) to press and fix the irregular edge of the vehicle frame; S4. After positioning and clamping of the various components of the frame, automatic welding operation is performed according to the welding sequence and welding parameters; S5. Clean and treat the surface impurities of the welded frame and perform non-destructive testing on the welded joints; S6. Finally, the welded frame is heat treated and the finished frame is subjected to a comprehensive quality inspection.

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