Automobile sheet metal part welding mechanism

Abstract

The invention relates to the technical field of sheet metal part machining, and discloses an automobile sheet metal part welding mechanism which comprises a welding machine body, a workbench installed on the welding machine body, a positioning part installed on the workbench and used for conducting machining pre-positioning according to sheet metal parts of different sizes, and a linear motor installed on the side portion of the welding machine body and used for conducting machining pre-positioning according to the sheet metal parts of different sizes. The positioning part, the flattening part, the clamping part and the feeding part are matched with the machining part to work, the positioning part can conduct machining and pre-positioning according to sheet metal parts of different sizes, and the sheet metal parts are positioned to proper positions through cooperation of a front positioning arm, a rear positioning arm, a clamping arm and a positioning frame. According to the flattening part, the problems of dislocation and height difference of the sheet metal parts are solved through pressure provided by deformation of a torsional spring, and structures such as a support, a U-shaped plate, a first supporting arm, a rotating rod, a second supporting arm, a pressing rod and the torsional spring cooperate with one another, so that the situations of dislocation and height difference in the welding period of the two sheet metal parts can be effectively prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of sheet metal part processing, and specifically to a welding mechanism for automotive sheet metal parts. Background Technique

[0002] During the production process of automobiles, a large number of sheet metal parts need to be welded and assembled. The welding of automotive sheet metal parts is actually welding sheet metal parts onto sheet metal parts to achieve restoration, enclosure, superposition of sheet metal parts, etc., so as to synthesize complete sheet metal parts by this means.

[0003] According to Chinese Patent Publication No. CN214641335U, this patent provides a pair - positioning mechanism for welding automotive sheet metal parts, including a support platform, a pair - positioning member, a fixing plate, a positioning connecting member, a guiding slideway, and a stabilizing rod. The support platform is formed by horizontally and vertically arranged square tubes connected end to end to form a rectangular frame structure. A horizontal guiding slideway is provided on the support platform, and a stabilizing rod is connected to the bottom end of the guiding slideway. The pair - positioning member is arranged on the guiding slideway through a plurality of cooperating fixing plates and positioning connecting members, which ensures the pair - positioning during welding, ensures the accuracy of the workpiece, effectively improves the work efficiency, is easy to adjust, flexible and convenient. Among them, through the set of cooperating support platform, pair - positioning member, positioning connecting member, and guiding slideway, the effective fixation of automotive sheet metal is realized, so that the fitting degree of the welding edge is high, and the welding quality can be effectively guaranteed.

[0004] However, during the actual welding process of automotive sheet metal parts, there will be a shape difference between the welding surfaces of the two sheet metal parts, resulting in different heights, which causes welding misalignment. Therefore, it is necessary to repair by means of rework in the later stage, which will reduce the efficiency of the welded finished product and increase the working hours. When there is an included angle between the welding surfaces of the two sheet metal parts, it is difficult to achieve a good polishing effect on the solder joints of the included angle through edge grinding, further increasing the processing difficulty and reducing the quality of the finished product. Therefore, a welding mechanism for automotive sheet metal parts is proposed to solve the above - mentioned problems. Summary of the Invention

[0005] (I) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the present invention provides a welding mechanism for automotive sheet metal parts, which solves the problems that there will be a shape difference between the welding surfaces of sheet metal parts, resulting in different heights, causing welding misalignment, and it is difficult to achieve a good polishing effect on the solder joints of the included angle through edge grinding.

[0007] (II) Technical Solutions

[0008] To achieve the above object, the present invention provides the following technical solution: An automobile sheet metal welding mechanism, including a welding machine body, a workbench is installed on the welding machine body, a positioning part is installed on the workbench for pre-positioning according to sheet metal parts of different sizes, a linear motor is installed on the side of the welding machine body, a flattening part is installed on the linear motor for flattening and aligning the height difference of the welding surface of the sheet metal part, a clamping part is installed on the flattening part for secondarily clamping the sheet metal part, an equipment table is installed at the rear of the workbench, a six-axis robotic arm is installed on the equipment table, a processing part is installed on the six-axis robotic arm for polishing the welding points of the welding angle of the sheet metal part, and a feeding part is installed on the equipment table for adsorbing and pushing the matching sheet metal parts for feeding.

[0009] Preferably, the positioning part includes a front positioning arm and a rear positioning arm. The front positioning arm and the rear positioning arm are respectively installed on the front side and the rear side of the top of the workbench. At both ends of the top of the rear positioning arm, positioning sleeves are fixedly connected. On the side where the front positioning arm and the rear positioning arm are close to each other, sliding grooves are opened. Between the sliding grooves of the front positioning arm and the rear positioning arm, two clamping arms are slidably connected. On the outer walls of the two clamping arms, a positioning frame is slidably sleeved. The bottom of the outer wall of the positioning frame is attached to the top of the workbench.

[0010] Preferably, the flattening part includes a bracket. The bracket is installed on the moving end of the linear motor. A U-shaped plate is fixedly connected to the bracket. On both ear ends of the U-shaped plate, a first support arm is rotatably connected. Between the ends of the two first support arms, a rotating rod is rotatably connected. Two second support arms are fixedly connected to the rotating rod. At the ends of the two second support arms, a pressing rod is fixedly connected. Between each second support arm and the adjacent first support arm, a torsion spring is elastically connected.

[0011] Preferably, the clamping part includes two sliding sleeves. The ends of the two sliding sleeves are respectively rotatably connected to the two first support arms. The inner walls of the two first support arms are both slidably connected with sliding rods. At the ends of the two sliding rods, a resisting rod is fixedly connected. The resisting rod is attached to the top of the workbench. Between the inner wall of each resisting rod and the connected sliding sleeve, a spring is elastically connected. A connecting rod is fixedly connected between the outer walls of the two sliding sleeves. Hinge pieces are fixedly connected to both the connecting rod and the U-shaped plate. Between the hinge pieces on the connecting rod, the inner rod end of a first electric push rod is hinged. The outer rod end of the first electric push rod is hinged between the hinge pieces of the U-shaped plate.

[0012] Preferably, there are two linear motors, two flattening parts and two clamping parts respectively. The two linear motors are symmetrically installed on both sides of the welding machine body. The other flattening part and clamping part are installed on the other linear motor. The two flattening parts and the two clamping parts are symmetrically arranged with each other. The two ends of the positioning frame are respectively installed on the two brackets of the two flattening parts.

[0013] Preferably, the processing part includes a hanging frame, which is installed on the connecting flange of the end effector of the six-axis robotic arm. A welding torch is installed at the bottom of the hanging frame. A first motor is installed on the inner wall of the hanging frame. A second motor is installed on the output shaft of the first motor. A protective shell is installed at the output end of the second motor. A grinding head is fixedly connected to the output shaft of the second motor. The grinding head extends outside the protective shell. A touch rod is fixedly connected to the back of the outer wall of the protective shell. A push-button switch is installed on the front of the hanging frame.

[0014] Preferably, the loading part includes two mounting arms, which are symmetrically installed on both sides of the top of the equipment table. Electric push rods II are installed on both mounting arms. The inner rod ends of the two electric push rods II are fixedly connected with a cross beam. Two connecting pieces are fixedly connected to the middle of the front of the cross beam. The bottom ends of the two connecting pieces are fixedly connected with a suction cup seat. An external suction cup is installed on the front of the suction cup seat. A pipe orifice is installed on the back of the suction cup seat.

[0015] Preferably, the external suction cup is communicated between the suction cup seat and the pipe orifice. The outer rod ends of the two electric push rods II are respectively inserted into the inner walls of the two positioning sleeves.

[0016] Preferably, a vacuum pump is installed on one side of the top of the equipment table. A sheet metal piece is attached to the external suction cup, and the sheet metal piece is attached between the two clamping arms.

[0017] Preferably, an L-shaped sheet metal part corresponding to the sheet metal piece is arranged on the workbench. The L-shaped sheet metal part is attached between the two clamping arms, and the L-shaped sheet metal part is also attached to the positioning frame.

[0018] (III) Beneficial effects

[0019] Compared with the prior art, the present invention provides a welding mechanism for automobile sheet metal parts, which has the following beneficial effects:

[0020] 1. For this welding mechanism for automobile sheet metal parts, the positioning part, flattening part, clamping part and loading part cooperate with the processing part to work. The positioning part can perform pre-positioning for processing according to sheet metal parts of different sizes. Through the cooperation of the front positioning arm, rear positioning arm, clamping arms and positioning frame, the sheet metal parts are positioned to a suitable position. Compared with the traditional technology, in this case, the flattening part uses the deformation of the torsion spring to provide pressure to reset the dislocation and height difference problems of the sheet metal parts, and adaptively corrects and compresses the different heights on both sides of the special-shaped sheet metal parts. The structures such as its support, U-shaped plate, first support arm, rotating rod, second support arm, pressing rod and torsion spring cooperate with each other, and can effectively prevent the dislocation and height difference during the welding of the two sheet metal parts.

[0021] 2. The welding mechanism for automotive sheet metal parts uses the clamping part to provide power through the telescopic movement of the first electric push rod, causing the angle between the pressing rod and the resisting rod to change to adapt to sheet metal parts of different sizes, further improving the stability of the sheet metal parts during welding. The cooperation of components such as two sliding sleeves, sliding rods, resisting rods, connecting rods, the first electric push rod, and springs enhances the clamping effect on the sheet metal parts.

[0022] 3. The welding mechanism for automotive sheet metal parts has a processing part including a hanging frame, a welding torch, a first motor, a second motor, a protective shell, a grinding head, a contact rod, and a push button switch, etc. The first motor is used to control rotation, and the second motor provides a stable rotation speed. During the welding process, all components work together to efficiently complete welding and grinding tasks. The feeding part, through structures such as a vacuum pump, a mounting arm, a second electric push rod, a cross beam, a connecting piece, a suction cup seat, an external suction cup, and a pipe opening, etc., can autonomously position the sheet metal part onto a suitable welding surface, facilitating the feeding operation quickly and improving the overall processing efficiency.

[0023] 4. The welding mechanism for automotive sheet metal parts can effectively solve the problems of height difference and misalignment caused by material shape differences with the flattening part and the clamping part, making the welding of sheet metal parts more accurate. During the welding process, first, spot welding is performed on the inner angle, then the flattening part and the clamping part are used to make the end positions of the sheet metal parts flush, and then full spot welding is carried out to ensure firm welding and accurate position. When the processing part is in the state of the pressing rod being pressed, through the cooperation of the first motor and the second motor, the inner angle welds of L-shaped sheet metal parts and sheet metal pieces can be polished and ground, avoiding the problem of incomplete polishing and residual welds at the inner angle during later horizontal throwing, and further improving the quality of the finished product.

[0024] 5. The welding mechanism for automotive sheet metal parts works with the positioning part, flattening part, clamping part, and feeding part in cooperation with the processing part, with strong adaptability. It can achieve good positioning, clamping, and height difference compensation effects for sheet metal parts of different sizes and special-shaped sheet metal parts. There are two each of the linear motors, flattening parts, and clamping parts, which can adapt to different heights at both ends of the sheet metal part for anti-misalignment and clamping, and can meet the processing requirements of various sheet metal parts, providing great convenience for the welding of sheet metal parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the overall front-side axonometric view of a welding mechanism for automotive sheet metal parts proposed by the present invention;

[0026] Figure 2 is the overall rear-side axonometric view of a welding mechanism for automotive sheet metal parts proposed by the present invention;

[0027] Figure 3 is the structural schematic diagram of the positioning part of a welding mechanism for automotive sheet metal parts proposed by the present invention;

[0028] Figure 4Connection diagram of the positioning frame, flattening part and clamping part of a welding mechanism for automotive sheet metal parts proposed by the present invention;

[0029] Figure 5 Schematic structural diagram of the flattening part and clamping part of a welding mechanism for automotive sheet metal parts proposed by the present invention;

[0030] Figure 6 Connection diagram of the six-axis robotic arm and the processing part of a welding mechanism for automotive sheet metal parts proposed by the present invention;

[0031] Figure 7 Schematic structural diagram of the processing part of a welding mechanism for automotive sheet metal parts proposed by the present invention;

[0032] Figure 8 Front side axonometric view of the loading part of a welding mechanism for automotive sheet metal parts proposed by the present invention;

[0033] Figure 9 Rear side axonometric view of the loading part of a welding mechanism for automotive sheet metal parts proposed by the present invention.

[0034] In the figure: 1. Welding machine body; 2. Workbench; 3. Positioning part; 31. Front positioning arm; 32. Rear positioning arm; 33. Positioning sleeve; 34. Clamping arm; 35. Positioning frame; 4. Linear motor; 5. Flattening part; 51. Bracket; 52. U-shaped plate; 53. First support arm; 54. Rotating rod; 55. Second support arm; 56. Pressing rod; 57. Torsion spring; 6. Clamping part; 61. Sliding sleeve; 62. Sliding rod; 63. Resisting rod; 64. Connecting rod; 65. First electric push rod; 7. Equipment table; 8. Six-axis robotic arm; 9. Processing part; 91. Hanger; 92. Welding torch; 93. First motor; 94. Second motor; 95. Protective shell; 96. Grinding head; 97. Contact rod; 98. Button switch; 10. Loading part; 101. Mounting arm; 102. Second electric push rod; 103. Cross beam; 104. Connecting piece; 105. Suction cup seat; 106. External suction cup; 107. Pipe orifice; 11. Vacuum pump; 12. L-shaped sheet metal part; 13. Sheet metal piece. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Please refer to Figures 1-9, the present invention provides a technical solution: an automobile sheet metal part welding mechanism, including a welding machine body 1, whose model adopts the HW series laser welding machine product for welding operations of small automobile sheet metal parts. The workbench 2 of this case is installed on the welding machine body 1, and the positioning part 3 of this case is installed on the workbench 2 for pre-positioning according to sheet metal parts of different sizes. The linear motor 4 of this case is installed on the side of the welding machine body 1, and the flattening part 5 of this case is installed on the linear motor 4 for flattening and aligning the height difference of the welding surface of the sheet metal parts. The clamping part 6 of this case is installed on the flattening part 5 for secondarily clamping the sheet metal parts. The equipment table 7 of this case is installed at the rear side of the workbench 2, the six-axis robotic arm 8 is installed on the equipment table 7, and the processing part 9 of this case is installed on the six-axis robotic arm 8 for polishing the welding points of the welding angle of the sheet metal parts. The feeding part 10 of this case is installed on the equipment table 7 for adsorbing and pushing the matching sheet metal parts for feeding.

[0037] In the present invention, in order to adapt to sheet metal parts of different sizes for pre-positioning before processing, the positioning part 3 of this case includes a front positioning arm 31 and a rear positioning arm 32. The front positioning arm 31 and the rear positioning arm 32 are respectively installed on the front side and the rear side of the top of the workbench 2. Positioning sleeves 33 are fixedly connected to the top ends of both ends of the rear positioning arm 32. Sliding grooves are opened on the sides of the front positioning arm 31 and the rear positioning arm 32 that are close to each other. Two clamping arms 34 are slidably connected between the sliding grooves of the front positioning arm 31 and the rear positioning arm 32. A positioning frame 35 is slidably sleeved on the outer walls of the two clamping arms 34. The sheet metal parts are positioned to a suitable processing position by using the clamping arms 34 and the positioning frame 35. The bottom of the outer wall of the positioning frame 35 is attached to the top of the workbench 2.

[0038] In this embodiment, in order to prevent the dislocation and height difference of the two sheet metal parts during welding, the flattening part 5 of this case includes a bracket 51. The bracket 51 is installed on the moving end of the linear motor 4. A U-shaped plate 52 is fixedly connected to the bracket 51. A first support arm 53 is rotatably connected to each of the two ear ends of the U-shaped plate 52. A rotating rod 54 is rotatably connected between the ends of the two first support arms 53. Two second support arms 55 are fixedly connected to the rotating rod 54. A pressing rod 56 is fixedly connected to the ends of the two second support arms 55. A torsion spring 57 is elastically connected between each of the two second support arms 55 and the adjacent first support arm 51. The torsion spring 57 deforms to provide pressure to reset the dislocation and height difference problems of the sheet metal parts.

[0039] In order to further improve the stability of the sheet metal parts during welding, the clamping part 6 of this case includes two sliding sleeves 61. The end parts of the two sliding sleeves 61 are respectively rotatably connected to the two first support arms 53. The inner walls of the two first support arms 53 are both slidably connected with sliding rods 62. The end parts of the two sliding rods 62 are fixedly connected with abutting rods 63. The abutting rods 63 are in contact with the top of the workbench 2. A spring is elastically connected between each abutting rod 63 and the inner wall of the connected sliding sleeve 61. A connecting rod 64 is fixedly connected between the outer walls of the two sliding sleeves 61. Hinge pieces are fixedly connected to both the connecting rod 64 and the U-shaped plate 52. The inner rod end of the first electric push rod 65 is hinged between the hinge pieces on the connecting rod 64. The outer rod end of the first electric push rod 65 is hinged between the hinge pieces of the U-shaped plate 52. The first electric push rod 65 is used to provide power by telescoping, so as to change the angle between the pressing rod 56 and the abutting rod 63 to adapt to sheet metal parts of different sizes.

[0040] In order to further improve the adaptability to special-shaped sheet metal parts, there are two linear motors 4, two flattening parts 5 and two clamping parts 6 in this case. The flattening parts 5 and clamping parts 6 on both sides can be used to adapt to different heights at both ends of the sheet metal parts to prevent misalignment and clamping. The two linear motors 4 are symmetrically installed on both sides of the welding machine body 1. Another flattening part 5 and clamping part 6 are installed on another linear motor 4. The two flattening parts 5 and the two clamping parts 6 are symmetrically arranged with each other. The two ends of the positioning frame 35 are respectively installed on the two brackets 51 in the two flattening parts 5.

[0041] It should be noted that in order to further improve the efficiency of welding processing, the processing part 9 of this case includes a hanging frame 91. The hanging frame 91 is installed on the end effector connection flange of the six-axis robotic arm 8. A welding torch 92 is installed at the bottom of the hanging frame 91. A first motor 93 is installed on the inner wall of the hanging frame 91. The first motor 93 uses the same model qddlite-ne30-36 brushless servo motor as the six-axis robotic arm 8 for controlling rotation. A second motor 94 is installed on the output shaft of the first motor 93. The second motor 94 uses a common 3-10w permanent magnet DC motor to provide a relatively stable rotational speed. A protective shell 95 is installed at the output end of the second motor 94. A grinding head 96 is fixedly connected to the output shaft of the second motor 94. The grinding head 96 extends outside the protective shell 95. The protective shell 95 plays a certain protective role for the grinding head 96. A contact rod 97 is fixedly connected to the back of the outer wall of the protective shell 95. A button switch 98 is installed on the front of the hanging frame 91.

[0042] It should be noted that in order to enable the sheet metal parts to be self-positioned on the appropriate welding surface, the loading part 10 of this case includes two mounting arms 101. The two mounting arms 101 are symmetrically mounted on both sides of the top of the equipment table 7. Electric push rods II 102 are mounted on both mounting arms 101. The inner rod ends of the two electric push rods II 102 are fixedly connected with a cross beam 103. The middle part of the front of the cross beam 103 is fixedly connected with two connecting pieces 104. The bottom ends of the two connecting pieces 104 are fixedly connected with a suction cup seat 105. An external suction cup 106 is mounted on the front of the suction cup seat 105. A pipe orifice 107 is mounted on the back of the suction cup seat 105. The external suction cup 106 is communicated through the suction cup seat 105 and the pipe orifice 107. The outer rod ends of the two electric push rods II 102 are respectively inserted into the inner walls of two positioning sleeves 33. A vacuum pump 11 is mounted on one side of the top of the equipment table 7. The vacuum pump 11 and the pipe orifice 107 can be connected through pipelines, so as to generate strong suction force on the external suction cup 106 by suction. A sheet metal piece 13 is attached to the external suction cup 106. The sheet metal piece 13 is attached between two clamping arms 34. An L-shaped sheet metal part 12 corresponding to the sheet metal piece 13 is arranged on the workbench 2. The L-shaped sheet metal part 12 is attached between two clamping arms 34. The L-shaped sheet metal part 12 is also attached to a positioning frame 35.

[0043] Working principle: The L-shaped sheet metal part 12 and the sheet metal piece 13 are two special-shaped sheet metal parts of the same specification. During welding, both sides of the L-shaped sheet metal part 12 need to be welded through the sheet metal piece 13. First, place the L-shaped sheet metal part 12 on the workbench 2, and use the two clamping arms 34 to slide between the front positioning arm 31 and the rear positioning arm 32 to locate and find the two end faces of the L-shaped sheet metal part 12, so as to perform limit. Then, through the synchronous movement of the two linear motors 4, the two brackets 51 are driven to drive the positioning frame 35 to slide on the clamping arms 34, so as to locate and find the side of the L-shaped sheet metal part 12 for fitting. At this time, the two end faces and one side of the L-shaped sheet metal part 12 are all stably limited, and the remaining side is used for welding work.

[0044] The vacuum pump 11 is connected to the pipe orifice 107 through a pipeline. Negative pressure passes through the suction cup seat 105 to the external suction cup 106 to adsorb the sheet metal piece 13. The sheet metal piece 13 has the same specification as the L-shaped sheet metal part 12. Therefore, the two end faces of the sheet metal piece 13 are also attached between the two clamping arms 34 at this time. At this time, the electric push rod II 102 extends to push the cross beam 103, and drives the suction cup seat 105 to move through the connecting piece 104, so as to push the sheet metal piece 13 to move towards the L-shaped sheet metal part 12 and contact. At this time, the inner angles of the sheet metal piece 13 and the L-shaped sheet metal part 12 are aligned. Use the six-axis robotic arm 8 to drive the welding torch 92 to perform a spot weld on the position of the two fitted inner angles, so as to weld the sheet metal piece 13 and the L-shaped sheet metal part 12 together.

[0045] Since only the inner included angle is welded at this time, the sheet metal piece 13 is not stable on the L-shaped sheet metal part 12, and there will still be problems such as dislocation and height difference caused by material shape difference. It is necessary to use the electric push rods 65 on both sides to extend and push the connecting rod 64, and promote the curve flipping of the sliding sleeve 61, thereby driving the curve flipping of the first support arm 53, promoting the lowering of the pressure rod 56 to reduce the included angle with the abutting rod 63. The abutting rod 63 then pushes the sliding rod 62 to always fit and move along the workbench 2 through the elastic force of the spring. When the abutting rod 63 abuts against the clamping arm 34, it provides a clamping force for the clamping arm 34, thereby improving the stability between the L-shaped sheet metal part 12 and the sheet metal piece 13. According to the different heights at both ends of the current L-shaped sheet metal part 12, the electric push rod 65 continues to advance, causing the sliding rod 62 to slide into the sliding sleeve 61 under force. At the same time, the height of the pressure rod 56 continues to decrease until the pressure rod 56 presses on the upper surfaces of the ends of the sheet metal piece 13 and the L-shaped sheet metal part 12, thereby making the positions of the two ends of the sheet metal piece 13 and the L-shaped sheet metal part 12 flush, avoiding the problems of height difference and dislocation. After the pressure rod 56 completes the pressing, the welding torch 92 performs spot welding in sequence along the inner included angle in the X-axis and Z-axis directions, promoting the stable welding of the sheet metal piece 13 on the L-shaped sheet metal part 12. Compared with the traditional technology, different from only being able to press a single sheet metal part as a whole under the traditional pressing structure, this case can adaptively correct and press the different heights on both sides of the special-shaped sheet metal part, and can independently respond to different special-shaped part structures to adaptively adjust the pressing force and angle, making the pressing process more flexible and reliable.

[0046] In the state where the pressure rod 56 is pressed, at this time, the L-shaped sheet metal part 12 and the sheet metal piece 13 are the most stable under force. By controlling the first motor 93 to drive the second motor 94 to rotate downward by ninety degrees, the protective shell 95 is made parallel to the hanger 91. At this time, the contact rod 97 contacts and presses the push button switch 98, thereby turning on the second motor 94 and driving the grinding head 96 to rotate. The grinding head 96 is used to polish and grind the inner included angle welding points of the L-shaped sheet metal part 12 and the sheet metal piece 13, avoiding the problem of incomplete polishing and residual welding points at the inner included angle during later horizontal throwing, and further improving the quality of the finished product.

[0047] After the soldering points at the inner included angle are polished, the first motor 93 resets and rotates by ninety degrees, making the protective shell 95 perpendicular to the hanging bracket 91. The contact rod 97 automatically moves away from the push-button switch 98, thus turning off the second motor 94 and stopping the rotation of the grinding head 96. After this step is completed, the first electric push rod 65 resets, prompting the pressing rod 56 to move away from the L-shaped sheet metal part 12, and at the same time prompting the abutting rod 63 to move away from the clamping arm 34. At this time, the L-shaped sheet metal part 12 remains in a stable state under the thrust of the suction cup seat 105 through the sheet metal piece 13. Since the edges of the L-shaped sheet metal part 12 and the sheet metal piece 13 are already fixed by spot welding at this time, the welding torch 92 is used to perform spot welding on the outer included angle where the L-shaped sheet metal part 12 and the sheet metal piece 13 were originally pressed, completing the final welding operation. Compared with the traditional technology, this case can perform automated welding and synchronous pressing work on two matching special-shaped sheet metal parts, without the need for manual holding of the sheet metal parts for calibration and splicing, further improving the processing efficiency, and having higher processing safety and matching degree.

[0048] This case uses the positioning part 3, the flattening part 5, the clamping part 6 and the feeding part 10 to cooperate with the processing part 9 for welding and grinding. The processing logic is strong, reducing the height difference and misalignment problems caused by the shape difference of the materials, making the quality of the processed sheet metal parts higher. At the same time, the device in this case has strong adaptability and can achieve good positioning, clamping and height difference compensation effects for sheet metal parts of different sizes and special-shaped sheet metal parts, providing convenience for sheet metal welding. Compared with the traditional technology, this case does not need to repair the welding surface of the sheet metal parts through multiple reworks, and can achieve complete welding and polishing work at one time, improving the processing efficiency. At the same time, by using reasonable program operations, it can directly polish and repair the soldering points at the welding included angle of the sheet metal parts, reducing the processing difficulty and alleviating the burden of manual rework.

[0049] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

Claims

1. An automobile sheet metal part welding mechanism, characterized in that, Comprising: The welding machine body (1); The workbench (2), which is installed on the welding machine body (1); The positioning part (3), which is installed on the workbench (2) and is used for pre-positioning according to sheet metal parts of different sizes; The positioning part (3) includes a front positioning arm (31) and a rear positioning arm (32). The front positioning arm (31) and the rear positioning arm (32) are respectively installed on the front side and the rear side of the top of the workbench (2). At both ends of the top of the rear positioning arm (32), positioning sleeves (33) are fixedly connected. On the side where the front positioning arm (31) and the rear positioning arm (32) are close to each other, sliding grooves are provided. Between the sliding grooves of the front positioning arm (31) and the rear positioning arm (32), two clamping arms (34) are slidably connected. On the outer walls of the two clamping arms (34), a positioning frame (35) is slidably sleeved. The bottom of the outer wall of the positioning frame (35) is in contact with the top of the workbench (2); The linear motor (4), which is installed on the side of the welding machine body (1); The flattening part (5), which is installed on the linear motor (4) and is used for flattening and aligning the height difference of the welding surface of the sheet metal part; The flattening part (5) includes a bracket (51). The bracket (51) is installed on the moving end of the linear motor (4). A U-shaped plate (52) is fixedly connected to the bracket (51). On both ear ends of the U-shaped plate (52), a first support arm (53) is rotatably connected. Between the ends of the two first support arms (53), a rotating rod (54) is rotatably connected. On the rotating rod (54), two second support arms (55) are fixedly connected. At the ends of the two second support arms (55), a pressing rod (56) is fixedly connected. Between each second support arm (55) and the adjacent first support arm (53), a torsion spring (57) is elastically connected; The clamping part (6), which is installed on the flattening part (5) and is used for clamping the sheet metal part secondly; The clamping part (6) includes two sliding sleeves (61). The ends of the two sliding sleeves (61) are respectively rotatably connected to the two first support arms (53). On the inner walls of the two first support arms (53), sliding rods (62) are slidably connected. At the ends of the two sliding rods (62), a resisting rod (63) is fixedly connected. The resisting rod (63) is in contact with the top of the workbench (2). Between the inner wall of each resisting rod (63) and the connected sliding sleeve (61), a spring is elastically connected. Between the outer walls of the two sliding sleeves (61), a connecting rod (64) is fixedly connected. On the connecting rod (64) and the U-shaped plate (52), hinge pieces are fixedly connected. Between the hinge pieces on the connecting rod (64), the inner rod end of an electric push rod one (65) is hinged. The outer rod end of the electric push rod one (65) is hinged between the hinge pieces of the U-shaped plate (52) The equipment table (7), which is installed at the rear of the workbench (2); The six-axis robotic arm (8), which is installed on the equipment table (7); The processing part (9), which is installed on the six-axis robotic arm (8) and is used for polishing the welding points of the welding angle of the sheet metal part; The loading part (10), which is installed on the equipment table (7) and is used for adsorbing and pushing the matching sheet metal parts for loading.

2. The welding mechanism for an automotive sheet metal part according to claim 1, characterized in that: The number of the linear motors (4), flattening parts (5) and clamping parts (6) is two each. The two linear motors (4) are symmetrically installed on both sides of the welding machine body (1), and the other flattening part (5) and clamping part (6) are installed on the other linear motor (4). The two flattening parts (5) and the two clamping parts (6) are symmetrically arranged with each other. The two ends of the positioning frame (35) are respectively installed on two brackets (51) of the two flattening parts (5).

3. The welding mechanism for an automotive sheet metal part according to claim 1, characterized in that: The processing part (9) includes a hanging frame (91). The hanging frame (91) is installed on the end effector connection flange of the six-axis robotic arm (8). A welding torch (92) is installed at the bottom of the hanging frame (91). A first motor (93) is installed on the inner wall of the hanging frame (91). A second motor (94) is installed on the output shaft of the first motor (93). A protective shell (95) is installed at the output end of the second motor (94). A grinding head (96) is fixedly connected to the output shaft of the second motor (94). The grinding head (96) extends out of the protective shell (95). A touch rod (97) is fixedly connected to the back of the outer wall of the protective shell (95). A push button switch (98) is installed on the front of the hanging frame (91).

4. The welding mechanism for an automotive sheet metal part according to claim 3, characterized in that: The feeding part (10) includes two mounting arms (101). The two mounting arms (101) are symmetrically installed on both sides of the top of the equipment table (7). Electric push rods two (102) are installed on the two mounting arms (101). The inner rod ends of the two electric push rods two (102) are fixedly connected with a cross beam (103). Two connecting pieces (104) are fixedly connected to the middle of the front of the cross beam (103). The bottom ends of the two connecting pieces (104) are fixedly connected with a suction cup seat (105). An external suction cup (106) is installed on the front of the suction cup seat (105). A pipe orifice (107) is installed on the back of the suction cup seat (105). The external suction cup (106) is communicated with the pipe orifice (107) through the suction cup seat (105). The outer rod ends of the two electric push rods two (102) are respectively inserted into the inner walls of the two positioning sleeves (33).

5. The welding mechanism for an automotive sheet metal part according to claim 4, characterized in that: A vacuum pump (11) is installed on one side of the top of the equipment table (7). A sheet metal piece (13) is attached to the external suction cup (106). The sheet metal piece (13) is attached between the two clamping arms (34).

6. The welding mechanism for an automotive sheet metal part according to claim 5, characterized in that: An L-shaped sheet metal part (12) corresponding to the sheet metal piece (13) is arranged on the workbench (2). The L-shaped sheet metal part (12) is attached between the two clamping arms (34). The L-shaped sheet metal part (12) is also attached to the positioning frame (35).

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