Automobile auxiliary frame welding system and welding method

Abstract

The invention relates to an automobile auxiliary frame welding system and a welding method.The welding system comprises a first welding workstation, a second welding workstation, a third welding workstation and a repair welding tool which are arranged in parallel, rotary tables are arranged in the first welding workstation, the second welding workstation and the third welding workstation, and two sets of position changing machines are arranged on the rotary tables; the position changing machine is connected with a workbench, and a clamping fixture is arranged on the workbench. Welding robots matched with the corresponding workbenches are arranged on the rotary tables, and lifting tools for lifting parts are distributed in the welding work stations. Automatic welding forming of the automobile auxiliary frame is achieved, manual repair welding is conducted after welding is conducted through the welding work station, the final finished product quality is guaranteed, meanwhile, auxiliary frame assembly welding and auxiliary frame part welding circulation in the same welding production line are achieved through cooperation of the positioner, the rotary table and the clamping clamp, the welding takt is reduced, and the production efficiency is improved. The welding efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile subframe production and processing, in particular to an automobile subframe welding system and a welding method. Background Art

[0002] The automobile subframe is an important part of the automobile body-in-white, used to carry the automobile engine and various bottom plate parts. The traditional automobile subframe production requires multiple assembly lines for welding and assembly, with a long production cycle and low efficiency. With the continuous popularization of automation technology, automated production lines are gradually being used in the field of automobile parts production to improve production efficiency and welding accuracy. In order to adapt to automated production, an automobile subframe welding system and welding method are designed and developed. Summary of the invention

[0003] In order to solve the above technical problems, the present invention proposes a welding system and a welding method for an automobile subframe. The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0004] An automobile subframe welding system comprises a first welding workstation, a second welding workstation, a third welding workstation and a repair welding tool arranged in parallel, wherein the first welding workstation, the second welding workstation and the third welding workstation are each provided with a turntable, the turntable is provided with two groups of No. 1 positioners, the No. 1 positioner is connected to a worktable, and the worktable is provided with a clamping fixture;

[0005] The turntable is provided with a welding robot cooperating with the corresponding workbench, and the welding workstation is provided with lifting equipment for lifting parts.

[0006] The clamping fixture on a workbench on one side of the third welding workstation includes a No. 1 clamp assembly installed on the workbench and used to fix the front subframe assembly, the workbench is provided with a No. 2 clamp assembly symmetrically distributed along the length direction of the workbench to fix the left and right front mounting brackets of the control arm, and the workbench is also provided with a No. 3 clamp assembly symmetrically distributed along the length direction of the workbench to enable the left and right front mounting bracket assemblies of the control arm to cooperate with the front subframe assembly.

[0007] The No. 2 clamp assembly includes a No. 1 positioning pin that passes through the front mounting bracket of the control arm and is mounted on the workbench, the No. 1 positioning pin is matched with a No. 1 limiting portion on the workbench to abut against the front mounting bracket of the control arm to limit the horizontal position of the front mounting bracket of the control arm, and a No. 1 pressure block that enables the self-locking nut to match the front mounting bracket of the control arm is distributed above the No. 1 positioning pin, and a No. 1 flip cylinder that drives the No. 1 pressure block to flip is provided on the workbench;

[0008] The No. 2 clamp assembly also includes a No. 1 pressure block that cooperates with the No. 1 limiting part to fix the horizontal position of the front mounting bracket of the control arm. The workbench is provided with a No. 1 cylinder that drives the No. 1 pressure block to move in the horizontal direction. The middle part of the No. 1 pressure block is provided with an avoidance groove for avoiding the No. 1 positioning pin.

[0009] The No. 3 clamp assembly includes a No. 2 positioning pin matched with the mounting holes on both sides of the front mounting bracket of the control arm, the No. 2 positioning pin is matched with a No. 2 cylinder installed on the workbench, the No. 2 positioning pin is hingedly installed at the end of the piston rod of the No. 2 cylinder, the No. 2 positioning pin is matched with a No. 2 pressure block, the No. 2 pressure block is matched with a No. 3 cylinder installed on the workbench, and the No. 2 pressure block is hingedly installed at the end of the piston rod of the No. 3 cylinder;

[0010] The No. 3 clamp assembly also includes a No. 1 load-bearing portion that is in contact with the inner surface of the control arm front mounting bracket to support the control arm front mounting bracket, and above the No. 1 load-bearing portion are two No. 3 pressure blocks that are distributed parallel to the length direction of the workbench to press the control arm front mounting bracket assembly to the front subframe, and the No. 3 pressure block is connected to a No. 2 flip cylinder installed on the workbench.

[0011] A welding method using an automobile subframe welding system comprises the following steps:

[0012] Step 1: Set the upper and lower pieces of the left and right longitudinal beams on one side of the first welding workstation, and combine the rear front connecting plate of the subframe and the inner reinforcement plate of the rear suspension bracket and distribute them on the same side of the upper and lower pieces of the left and right longitudinal beams, and then fix them with a clamping fixture. The left and right longitudinal beams and the rear front connecting plate assembly of the subframe are obtained by welding the welding robot and the rotating worktable of the No. 1 positioner;

[0013] Step 2: The turntable rotates, and the rear lower sheet of the subframe is set in the middle of the other side of the first welding workstation, and the rear front connecting plate assembly of the subframe is matched with the rear lower sheet of the subframe. The front of the worktable is provided with left and right front collision bracket lower connecting plates and the rear suspension left bracket, and then fixed with a clamping fixture, and the welding robot and the No. 1 positioner rotating worktable are used for welding to obtain the rear lower sheet assembly of the subframe;

[0014] Step 3: Use a hoist to hoist the left and right longitudinal beam assemblies and the rear lower body of the sub-frame to the middle of one side of the second welding workstation and combine the left and right longitudinal beam assemblies and the rear lower body of the sub-frame. Bent arms are also provided on both sides of the workbench, and then fixed with a clamp. The sub-frame and the left and right bent arm assemblies are obtained by welding the welding robot and the No. 1 positioner rotating workbench;

[0015] Step 4: Lift the welded subframe with a hoist, and rotate the turntable 360 ​​degrees. The hoist places the subframe in the middle of the other side of the second welding workstation. Then, match the left and right bending arm assemblies, control arm mounting plates, and front collision bracket plates with the subframe, and fix them with a clamping fixture. The subframe frame is obtained by welding with the cooperation of the welding robot and the No. 1 positioner rotating worktable.

[0016] Step 5: Lift the subframe by the hoist and transport it to the third welding workstation. Place the subframe in the middle of the workbench on the other side of the third welding workstation by the hoist. Combine the rear suspension bracket assembly with the subframe and fix them with a clamp. Use the welding robot and the No. 1 positioner to rotate the workbench for welding.

[0017] Step 6: Lift the subframe with a hoist, then rotate the turntable 360 ​​degrees to place the subframe on the workbench on one side of the third welding workstation, match the left and right bracket assemblies of the front suspension with the subframe and fix them with a clamp, and weld them with the welding robot and the No. 1 positioner rotating worktable to obtain the subframe assembly;

[0018] Step 7: Lift the subframe assembly with a hoist and transport it to the repair welding fixture, and repair the subframe assembly by rotating the No. 2 positioner in the repair welding fixture and manual cooperation.

[0019] In the second step, the left and right longitudinal beam upper pieces are arranged in the workbench, and the longitudinal beam reinforcement plate is matched with the left and right longitudinal beam upper pieces, and then fixed with a clamping fixture, and the welding robot and the No. 1 positioner rotating workbench are used for welding;

[0020] In the second step, the steering gear sleeve is matched with the rear lower plate of the subframe through a clamping fixture. At the same time, the body mounting sleeve is matched with the lower connecting plates of the left and right front collision brackets through a clamping fixture, and then fixed with a clamp. The welding is carried out by the cooperation of the welding robot and the rotating worktable of the No. 1 positioner.

[0021] In the sixth step, the workbench is also equipped with a rear suspension bracket, a rear suspension bracket reinforcement plate and a front suspension left and right bracket, which are then fixed with a number of clamps and welded by the welding robot and the No. 1 positioner rotating workbench. After welding, the rear suspension bracket assembly is transferred to the workbench in the fifth step for welding with the subframe frame.

[0022] The beneficial effects of the present invention are as follows: the present invention realizes the automatic welding forming of the automobile subframe, and after being welded at the welding workstation, manual welding is performed to ensure the quality of the final product. At the same time, through the cooperation of the positioner, the turntable and the clamping fixture, the welding of the subframe assembly and the welding of the various components of the subframe are realized in the same welding production line, and the welding cycle is reduced, thereby improving the welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0025] Figure 2 The first welding workstation of the present invention is a schematic diagram of the three-dimensional structure Figure 1 ;

[0026] Figure 3 The first welding workstation of the present invention is a schematic diagram of the three-dimensional structure Figure 2 ;

[0027] Figure 4 The three-dimensional structure of the second clamp assembly of the present invention is shown in FIG. Figure 1 ;

[0028] Figure 5 The three-dimensional structure of the second clamp assembly of the present invention is shown in FIG. Figure 2 ;

[0029] Figure 6 The three-dimensional structure of the clamp assembly No. 3 of the present invention is shown in FIG. Figure 1 ;

[0030] Figure 7 The structure of the clamp assembly No. 3 of the present invention is shown in FIG. Figure 2 ;

[0031] Figure 8 The partial three-dimensional structure of the welding tool of the present invention is shown in FIG. Figure 1 ;

[0032] Fig. 9 The partial three-dimensional structure of the welding tool of the present invention is shown in FIG. Figure 2 ;

[0033] Fig.10 It is a schematic diagram of the three-dimensional structure of the guide assembly of the present invention;

[0034] Fig.11 It is a schematic diagram of the lifting mechanism structure of the present invention;

[0035] Fig.12 It is a schematic diagram of the local structure of the lifting mechanism of the present invention.

[0036] As shown in the figure: 1. The first welding workstation; 2. The second welding workstation; 3. The third welding workstation; 4. The repair welding tool; 5. The turntable; 6. The first positioner; 7. The worktable; 8. The clamping fixture; 9. The first fixture assembly; 10. The second fixture assembly; 11. The third fixture assembly; 12. The welding robot; 13. The lifting device; 101. The first positioning pin; 102. The first limiting part; 103. The first pressure block; 104. The first turning cylinder; 105. The first pressure block; 106. The first cylinder; 107. The avoidance groove; 111. The second positioning pin; 112. The second cylinder; 113. The second pressure block; 114. The third cylinder; 115. No. 1 load-bearing part; 116, No. 3 pressure block; 117, No. 2 turning cylinder; 118, moving platform; 119, No. 5 cylinder; 41, frame; 42, No. 2 positioner; 43, No. 3 positioning pin; 44, No. 2 load-bearing part; 45, guide assembly; 46, lifting mechanism; 47, No. 4 cylinder; 48, No. 3 turning cylinder; 451, No. 4 positioning pin; 452, adapter plate; 453, sleeve; 454, guide rod; 455, spring; 461, lifting platform; 462, connecting column; 463, No. 4 pressure block; 464, reset spring; 465, limit groove; 467, guide plate; 468, No. 1 inclined plane; 469, No. 2 inclined plane. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be explained more clearly and completely below in conjunction with the drawings in the embodiments. Of course, the described embodiments are only a part of the present invention but not all of it. Based on this embodiment, other embodiments obtained by those skilled in the art without creative labor are all within the protection scope of the present invention.

[0038] like Figures 1 to 12 As shown, a welding system for a vehicle subframe comprises a first welding workstation 1, a second welding workstation 2, a third welding workstation 3, and a repair welding tool 4 arranged in parallel, wherein the first welding workstation 1, the second welding workstation 2, and the third welding workstation 3 are each provided with a turntable 5, and the turntable 5 is provided with two groups of No. 1 positioners 6, and the No. 1 positioner 6 is connected to a worktable 7, and the worktable 7 is provided with a clamping fixture 8;

[0039] The turntable 5 is provided with a welding robot 12 cooperating with the corresponding workbench, and the welding workstation is provided with lifting devices 13 for lifting parts.

[0040] The clamping fixture 8 on the workbench 7 on one side of the third welding workstation 3 includes a No. 1 clamp component 9 installed on the workbench 7 and used to fix the front subframe assembly, and the workbench 7 is provided with a No. 2 clamp component 10 symmetrically distributed along the length direction of the workbench 7 to fix the left and right front mounting brackets of the control arm, and the workbench 7 is also provided with a No. 3 clamp component 11 symmetrically distributed along the length direction of the workbench 7 to enable the left and right front mounting bracket assemblies of the control arm to cooperate with the front subframe assembly.

[0041] The second clamp assembly 10 includes a No. 1 positioning pin 101 that passes through the front mounting bracket of the control arm and is mounted on the workbench 7. The No. 1 positioning pin 101 is matched with a No. 1 limiting portion 102 on the workbench 7 to abut against the front mounting bracket of the control arm to limit the horizontal position of the front mounting bracket of the control arm. A No. 1 pressing block 103 is distributed above the No. 1 positioning pin 101 to make the self-locking nut match the front mounting bracket of the control arm. The workbench 7 is provided with a No. 1 turning cylinder 104 that drives the No. 1 pressing block 103 to turn over.

[0042] The No. 2 clamp assembly 10 also includes a No. 1 pressure block 105 that cooperates with the No. 1 limiting portion 102 to fix the horizontal position of the control arm front mounting bracket. The workbench 7 is provided with a No. 1 cylinder 106 that drives the No. 1 pressure block 105 to move in the horizontal direction. The middle of the No. 1 pressure block 105 is provided with an avoidance groove 107 for avoiding the No. 1 positioning pin 101; the No. 2 clamp assembly 10 is used to tighten the control arm front mounting bracket and the self-locking nut and weld them through the welding robot 12 to form a control arm front mounting bracket assembly.

[0043] The first limiting part 102 is provided with two along the width direction of the workbench 7, and the first pressing block 105 is provided corresponding to the first limiting part 102, and the first pressing block 10 is driven by the first cylinder 106 to cooperate with the first limiting part 102 to fix the position of the front mounting bracket of the control arm;

[0044] The self-locking nut cooperates with the No. 1 positioning pin 101 for positioning, and the No. 1 pressure block 103 is driven by the No. 1 turning cylinder 104 to press the self-locking nut and the front mounting bracket of the control arm.

[0045] The No. 3 clamp assembly 11 includes a No. 2 positioning pin 111 matched with the mounting holes on both sides of the front mounting bracket of the control arm, the No. 2 positioning pin 111 is matched with a No. 2 cylinder 112 installed on the workbench 7, the No. 2 positioning pin 111 is hingedly installed at the end of the piston rod of the No. 2 cylinder 112, the No. 2 positioning pin 111 is matched with a No. 2 pressure block 113, the No. 2 pressure block 113 is matched with a No. 3 cylinder 114 installed on the workbench 7, and the No. 2 pressure block 113 is hingedly installed at the end of the piston rod of the No. 3 cylinder 114;

[0046] The No. 3 clamp assembly 11 also includes a No. 1 load-bearing portion 115 that is in contact with the inner surface of the control arm front mounting bracket to support the control arm front mounting bracket, and above the No. 1 load-bearing portion 115 are two No. 3 pressure blocks 116 that are distributed parallel to the length direction of the workbench 7 to press the control arm front mounting bracket assembly and the front subframe, and the No. 3 pressure blocks 116 are connected to a No. 2 flip cylinder 117 installed on the workbench 7; a moving platform 118 is slidably installed on the workbench 7, and the No. 2 flip cylinder 11 and the No. 3 cylinder 114 are both fixed on the moving platform 118, and a No. 5 cylinder 119 is provided on the workbench 7 to drive the moving platform 118 to slide.

[0047] After placing the control arm front mounting bracket assembly and cooperating with the No. 2 positioning pin 111, the No. 5 cylinder 119 drives the moving platform 118 to slide so that the control arm front mounting bracket assembly fits with the corresponding position of the front subframe, and the No. 2 cylinder 112 drives the No. 2 positioning pin 111 to cooperate with the mounting holes on both sides of the control arm front mounting bracket, and then the No. 3 cylinder 114 drives the No. 2 pressure block 113 to flip and cooperate with the No. 2 positioning pin 111 to fix the position of the control arm front mounting bracket assembly;

[0048] The No. 2 flip cylinder 117 drives the No. 3 pressing block 116 to flip and press the control arm front mounting bracket assembly and the front subframe tightly, and then the welding robot 12 welds the control arm front mounting bracket assembly to the front subframe.

[0049] The repair welding tool 4 includes a frame 41, and the frame 41 is equipped with a No. 2 positioner 42. The frame 41 is provided with a No. 3 positioning pin 43 that cooperates with the collision bracket assembly in the subframe for positioning and a No. 2 bearing part 44 that cooperates with the control arm mounting point. A guide component 45 that cooperates with the positioning holes of the lower sheet of the front subframe and the positioning holes of the bent arm to assist the lifting of the subframe is provided below the frame 41. Any one of the No. 3 positioning pin 43 and the No. 2 bearing part 44 is equipped with a No. 3 flip cylinder 48 that presses the subframe.

[0050] The guide assembly 45 includes four positioning pins 451 respectively matched with the positioning holes of the lower plate body of the front sub-frame and the positioning holes of the bent arm, the four positioning pins 451 are connected with adapter plates 452, the adapter plates 452 are connected with sliding sleeves 453, the sliding sleeves 453 are matched with guide rods 454 installed at the bottom of the frame 41, and springs 455 are distributed between the sliding sleeves 453 and the guide rods 454. The bottom of the frame 41 is also provided with a lifting mechanism 46 to assist the four positioning pins 451 to rise; the lifting device 13 lifts the sub-frame as a whole After being hoisted to the top of the repair welding fixture 4, the sub-frame can be slowly lowered by the guide assembly 45, and the sub-frame can be driven to rise at a uniform speed by the lifting mechanism 46 to prevent the spring 455 from suddenly releasing the elastic force of the No. 3 flip cylinder 48 after it is reset, causing the sub-frame to shake in the repair welding fixture 4 and causing safety accidents such as the sub-frame detachment; at the same time, the existence of the No. 3 flip cylinder 48 will hinder manual operation when the hoist 13 descends to retrieve the sub-frame, so the guide assembly 45 is used to lift the sub-frame to reduce the influence of the No. 3 flip cylinder 48 on the hoisting of the sub-frame.

[0051] The lifting mechanism 46 includes a lifting platform 461, and also includes two connecting columns 462 connected to the sliding sleeve 453 and symmetrically arranged. The lifting platform 461 is provided with a limiting groove 465 that engages with the corresponding connecting column 462. Two No. 4 pressure blocks 463 that fix the corresponding connecting column 462 in the limiting groove 465 are slidably installed on the lifting platform 461. The lifting platform 461 is connected to a No. 4 cylinder 47 installed on the frame 41; after the sub-frame is placed and matched with the No. 4 positioning pin 451, the sliding sleeve 453 slides downward along the guide rod 454 under the action of the gravity of the sub-frame, driving the sub-frame to slowly descend, and at the same time At this time, the connecting column 462 and the first inclined surface 468 are in contact with each other to drive the fourth pressure block 463 to slide, so that the connecting column 462 enters the limiting groove 465, and then the reset spring 464 drives the fourth pressure block 463 to reset and press the connecting column 462; after the repair welding is completed, the fourth cylinder 47 drives the lifting platform 461 to rise, and drives the sliding sleeve 453 to rise at a uniform speed through the connecting column 462. When the guide wheel 456 cooperates with the second inclined surface 469 to drive the fourth pressure block 463 to move relative to each other, the connecting column 462 is separated from the limiting groove 465 under the final elastic force of the spring 455, and then the fourth cylinder 47 drives the lifting platform 461 to reset. The sub-frame is lifted to a certain height from the frame 41 through the fourth positioning pin 451 to prevent the main structure of the repair welding tool 4 from affecting the lifting and transportation of the sub-frame, which is convenient for robot or manual operation.

[0052] A return spring 464 is provided between the fourth pressing block 463, and a guide wheel 456 is provided on each of the fourth pressing blocks 463. A guide plate 467 is provided on the frame 41 to cooperate with the guide wheel 456 to enable the fourth pressing block 463 to move relative to each other;

[0053] The fourth pressing block 463 is provided with a first inclined surface 468 that abuts against the connecting column 462 , and the guide plate 467 is provided with a second inclined surface 469 that cooperates with the corresponding guide wheel 456 .

[0054] A welding method using an automobile subframe welding system comprises the following steps:

[0055] The first step: the upper and lower pieces of the left and right longitudinal beams are arranged on one side of the first welding workstation 1, and the rear front connecting plate of the subframe and the inner reinforcement plate of the rear suspension bracket are combined and distributed on the same side of the upper and lower pieces of the left and right longitudinal beams, and then fixed with a clamping fixture 8, and the left and right longitudinal beams and the rear front connecting plate assembly of the subframe are obtained by welding with the cooperation of the welding robot 12 and the rotating worktable 7 of the No. 1 positioner 6;

[0056] Step 2: The turntable 5 rotates, and the rear lower sheet of the sub-frame is set in the middle of the other side of the first welding workstation 1, and the rear front connecting plate assembly of the sub-frame is matched with the rear lower sheet of the sub-frame. The front part of the worktable is provided with the left and right front collision bracket lower connecting plates and the rear suspension left bracket, and then fixed with a clamping fixture 8, and the welding robot 12 and the first positioner 6 rotate the worktable 7 to cooperate with welding to obtain the rear lower sheet assembly of the sub-frame;

[0057] Step 3: The left and right longitudinal beam assemblies and the rear lower plate of the auxiliary frame are hoisted to the middle of one side of the second welding workstation 2 by the hoist 13 and the left and right longitudinal beam assemblies and the rear lower plate of the auxiliary frame are combined. The workbench 7 is also provided with curved arms on both sides, and then fixed with a clamping fixture 8. The welding robot 12 and the first positioner 6 rotate the workbench 7 to cooperate with welding to obtain the auxiliary frame and the left and right curved arm assemblies;

[0058] Step 4: Lift the welded sub-frame by the lifting device 13, and rotate the turntable 360 ​​degrees at the same time. The lifting device 13 places the sub-frame in the middle of the other side of the second welding workstation 2, and then match the left and right bending arm assemblies, the control arm mounting sheet, and the front collision bracket sheet with the sub-frame, and then fix them with the clamping fixture 8. The sub-frame frame is obtained by welding with the cooperation of the welding robot 12 and the rotating worktable 7 of the No. 1 positioner 6;

[0059] Step 5: Lift the subframe by the hoist 13 and transport it to the third welding workstation 3, place the subframe in the middle of the workbench on the other side of the third welding workstation 3 by the hoist 13, combine the rear suspension bracket assembly with the subframe, and then fix them with the clamping fixture 8, and weld by the welding robot 12 and the No. 1 positioner 6 rotating workbench 7;

[0060] Step 6: Lift the sub-frame by the lifting device 13, then rotate the turntable 360 ​​degrees to place the sub-frame on the workbench on one side of the third welding workstation 3, match the left and right bracket assemblies of the front suspension with the sub-frame and fix them with the clamping fixture 8, and weld them by the welding robot 12 and the rotating workbench 7 of the No. 1 positioner 6 to obtain the sub-frame assembly;

[0061] Step 7: Lift the sub-frame assembly by the lifting device 13 and transport it to the repair welding fixture 4, and repair welding the sub-frame assembly by rotating the second positioner 42 in the repair welding fixture 4 and manually cooperating.

[0062] 9. The automobile subframe welding method according to claim 8 is characterized in that: in the second step, the workbench 7 is provided with left and right longitudinal beam upper pieces, and the longitudinal beam reinforcement plate is matched with the left and right longitudinal beam upper pieces, and then fixed with a clamping fixture 8, and the welding robot 12 and the first positioner 6 rotate the workbench 7 to cooperate with welding;

[0063] In the second step, the steering gear sleeve is matched with the rear lower plate of the subframe through the clamping fixture 8, and the body mounting sleeve is matched with the lower connecting plates of the left and right front collision brackets through the clamping fixture 8, and then fixed with the clamping fixture 8, and welded by the welding robot 12 and the rotating workbench 7 of the No. 1 positioner 6.

[0064] In the sixth step, the workbench 7 is also provided with a rear suspension bracket, a rear suspension bracket reinforcement plate and a front suspension left and right bracket, which are then fixed with a number of clamps 8, and the welding robot 12 and the No. 1 positioner 6 rotate the workbench 7 to cooperate in welding; after the welding is completed, the rear suspension bracket assembly is transferred to the workbench 7 in the fifth step for welding with the subframe frame.

[0065] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An automobile subframe welding system, characterized in that: The invention comprises a first welding workstation (1), a second welding workstation (2), a third welding workstation (3), and a repair welding tool (4) which are arranged in parallel. The first welding workstation (1), the second welding workstation (2), and the third welding workstation (3) are each provided with a turntable (5). The turntable (5) is provided with two groups of No. 1 positioners (6). The No. 1 positioners (6) are connected to a worktable (7). The worktable (7) is provided with a clamping fixture (8). The turntable is provided with a welding robot (12) that cooperates with the corresponding workbench, and the welding workstation is provided with lifting tools (13) for lifting parts.

2. The automobile subframe welding system according to claim 1, characterized in that: The clamping fixture (8) on the workbench (7) on one side of the third welding workstation (3) comprises a first clamp assembly (9) mounted on the workbench (7) and used to fix the front subframe assembly, a second clamp assembly (10) symmetrically distributed along the length direction of the workbench (7) for fixing the left and right front mounting brackets of the control arm is provided on the workbench (7), and a third clamp assembly (11) symmetrically distributed along the length direction of the workbench (7) for matching the left and right front mounting bracket assemblies of the control arm with the front subframe assembly is also provided on the workbench (7).

3. The automobile subframe welding system according to claim 2, characterized in that: The second clamp assembly (10) comprises a No. 1 positioning pin (101) penetrating the front mounting bracket of the control arm and mounted on the workbench (7); the No. 1 positioning pin (101) is matched with a No. 1 limiting portion (102) on the workbench (7) for abutting against the front mounting bracket of the control arm to limit the horizontal position of the front mounting bracket of the control arm; a No. 1 pressing block (103) is distributed above the No. 1 positioning pin (101) for making the self-locking nut match the front mounting bracket of the control arm; and a No. 1 turning cylinder (104) for driving the No. 1 pressing block (103) to turn over is provided on the workbench (7); The No. 2 clamp assembly (10) also includes a No. 1 pressure block (105) that cooperates with the No. 1 limiting portion (102) to fix the horizontal position of the front mounting bracket of the control arm, and the workbench (7) is provided with a No. 1 cylinder (106) that drives the No. 1 pressure block (105) to move in the horizontal direction, and the middle of the No. 1 pressure block (105) is provided with an avoidance groove (107) that avoids the No. 1 positioning pin (101).

4. The automobile subframe welding system according to claim 3, characterized in that: The No. 3 clamp assembly (11) includes a No. 2 positioning pin (111) matched with the mounting holes on both sides of the front mounting bracket of the control arm, the No. 2 positioning pin (111) is matched with a No. 2 cylinder (112) installed on the workbench (7), the No. 2 positioning pin (111) is hingedly installed on the end of the piston rod of the No. 2 cylinder (112), the No. 2 positioning pin (111) is matched with a No. 2 pressure block (113), the No. 2 pressure block (113) is matched with a No. 3 cylinder (114) installed on the workbench (7), and the No. 2 pressure block (113) is hingedly installed on the end of the piston rod of the No. 3 cylinder (114); The No. 3 clamp assembly (11) also includes a No. 1 bearing portion (115) which is fitted with the inner surface of the control arm front mounting bracket to support the control arm front mounting bracket, and above the No. 1 bearing portion (115) are two No. 3 pressing blocks (116) which are distributed in parallel along the length direction of the workbench (7) to press the control arm front mounting bracket assembly and the front subframe, and the No. 3 pressing block (116) is connected to a No. 2 turning cylinder (117) installed on the workbench (7).

5. The automobile subframe welding system according to claim 1, characterized in that: The repair welding tool (4) comprises a frame (41), the frame (41) is matched with a No. 2 positioner (42), the frame (41) is provided with a No. 3 positioning pin (43) matched with the collision bracket assembly in the sub-frame for positioning and a No. 2 bearing part (44) matched with the control arm mounting point, the frame (41) is provided with a guide assembly (45) respectively matched with the front sub-frame lower plate positioning hole and the bending arm positioning hole to assist the sub-frame in lifting and lowering, and any one of the No. 3 positioning pin (43) and the No. 2 bearing part (44) is matched with a No. 3 turning cylinder (48) for pressing the sub-frame.

6. The automobile subframe welding system according to claim 5, characterized in that: The guide assembly (45) includes four positioning pins (451) respectively matched with the positioning holes of the lower plate of the front subframe and the positioning holes of the bent arm, the four positioning pins (451) are connected with adapter plates (452), the adapter plates (452) are connected with sliding sleeves (453), the sliding sleeves (453) are matched with guide rods (454) installed at the bottom of the frame (41), springs (455) are distributed between the sliding sleeves (453) and the guide rods (454), and a lifting mechanism (46) for assisting the four positioning pins (451) to rise is also provided at the bottom of the frame (41).

7. The automobile subframe welding system according to claim 6, characterized in that: The lifting mechanism (46) includes a lifting platform (461), and also includes two connecting columns (462) connected to the sliding sleeve (453) and symmetrically arranged. The lifting platform (461) is provided with a limiting groove (465) engaged with the corresponding connecting column (462). Two No. 4 pressure blocks (463) are slidably installed on the lifting platform (461) to fix the corresponding connecting column (462) in the limiting groove (465). The lifting platform (461) is connected to a No. 4 cylinder (47) installed on the frame (41); A return spring (464) is provided between the fourth pressing blocks (463), a guide wheel (456) is provided on each of the fourth pressing blocks (463), and a guide plate (467) is provided on the frame (41) to cooperate with the guide wheel (456) to enable the fourth pressing block (463) to move relative to each other; The fourth pressing block (463) is provided with a first inclined surface (468) that abuts against the connecting column (462), and the guide plate (467) is provided with a second inclined surface (469) that cooperates with the corresponding guide wheel (456).

8. A welding method using the automobile subframe welding system according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: The first step is to arrange the upper and lower plates of the left and right longitudinal beams on one side of the first welding workstation (1), and to combine and distribute the rear front connecting plate of the subframe and the inner reinforcement plate of the rear suspension bracket on the same side of the upper and lower plates of the left and right longitudinal beams, and then fix them with a clamping fixture (8), and to weld the left and right longitudinal beams and the rear front connecting plate assembly of the subframe by the cooperation of a welding robot (12) and a No. 1 positioner (6) and a rotating workbench (7); Step 2: The turntable (5) is rotated, and the rear lower plate of the sub-frame is arranged in the middle of the other side of the first welding workstation (1), and the rear front connecting plate assembly of the sub-frame is matched with the rear lower plate of the sub-frame. The front part of the worktable is provided with left and right front collision bracket lower connecting plates and a rear suspension left bracket, and then fixed with a clamping fixture (8). The welding robot (12) and the first positioner (6) rotate the worktable (7) to cooperate for welding, and the rear lower plate assembly of the sub-frame is obtained; Step 3: The left and right longitudinal beam assemblies and the rear lower plate of the auxiliary frame are hoisted to the middle of one side of the second welding workstation (2) by means of a hoist (13) and the left and right longitudinal beam assemblies and the rear lower plate of the auxiliary frame are combined. The worktable (7) is also provided with curved arms on both sides and then fixed with a clamping fixture (8). The welding robot (12) and the first positioner (6) rotate the worktable (7) to cooperate in welding to obtain the auxiliary frame and the left and right curved arm assemblies; Step 4: The welded sub-frame is lifted by the lifting device (13), and the turntable is rotated 360 degrees at the same time. The lifting device (13) places the sub-frame in the middle of the other side of the second welding workstation (2), and then the left and right bending arm assemblies, the control arm mounting sheet, and the front collision bracket sheet are matched with the sub-frame, and then fixed with a clamping fixture (8), and the sub-frame frame is obtained by welding through the cooperation of the welding robot (12) and the first positioner (6) rotating worktable (7); Step 5: The sub-frame is lifted by the lifting device (13) and transported to the third welding workstation (3), and the sub-frame is placed in the middle of the workbench on the other side of the third welding workstation (3) by the lifting device (13), and the rear suspension bracket assembly is combined with the sub-frame, and then fixed by the clamping fixture (8), and the welding robot (12) and the first positioner (6) rotate the workbench (7) to perform welding; Step 6: Lift the sub-frame by the lifting device (13), then rotate the turntable 360 ​​degrees to place the sub-frame on a workbench on one side of the third welding workstation (3), match the left and right bracket assemblies of the front suspension with the sub-frame and fix them with a clamping fixture (8), and weld by the welding robot (12) and the first positioner (6) rotating worktable (7) to obtain the sub-frame assembly; Step 7: The auxiliary frame assembly is lifted by the lifting device (13) and transported to the repair welding fixture (4), and the auxiliary frame assembly is repair welded by rotating the second positioner (42) in the repair welding fixture (4) and manually cooperating.

9. The welding method according to claim 8, characterized in that: In the second step, the workbench (7) is provided with left and right longitudinal beam upper pieces, and the longitudinal beam reinforcement plate is matched with the left and right longitudinal beam upper pieces, and then fixed with a clamping fixture (8), and the welding robot (12) and the first positioner (6) rotate the workbench (7) to cooperate with welding; In the second step, the steering gear sleeve is matched with the rear lower plate of the auxiliary frame by means of a clamping fixture (8), and at the same time, the vehicle body mounting sleeve is matched with the lower connecting plates of the left and right front collision brackets by means of a clamping fixture (8), and then fixed by means of the clamping fixture (8), and welding is performed by means of the welding robot (12) and the rotating workbench (7) of the first positioner (6).

10. The welding method according to claim 8, characterized in that: In the sixth step, a rear suspension bracket, a rear suspension bracket reinforcement plate and left and right front suspension brackets are also arranged on the workbench (7), and then fixed by a plurality of clamping fixtures (8). The welding robot (12) and the first positioner (6) rotate the workbench (7) to cooperate in welding. After the welding is completed, the rear suspension bracket assembly is transferred to the workbench (7) in the fifth step for welding with the subframe frame.

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