Automatic welding equipment and welding method for automobile bumper beam assembly

Abstract

The present invention relates to the technical field of automobile bumper beam assembly manufacturing, specifically to an automatic welding device and welding method for automobile bumper beam assembly, comprising a base, a fixture seat fixedly installed on the upper end surface of the base, a welding mechanical arm located in front of the fixture seat and symmetrical on the left and right, and a supporting mechanism arranged on the fixture seat. A comprehensive operation model of supporting, limiting and aligning is adopted to complete the rapid welding of the automobile bumper beam and the energy absorption box after integrated clamping and fixing. First, the position of the beam is accurately corrected by the pressure limiting and internal expansion of the upper and lower end surfaces of the beam to ensure the accurate alignment of the beam and the energy absorption box. At the same time, the trapezoidal structure support is used to enhance the overall stability, reduce vibration and deformation during welding, and avoid deformation caused by thermal stress, so as to achieve the uniformity and consistency of the welding seam through the mutual cooperation of the mechanisms, significantly improve the overall welding quality and strength, and improve the production efficiency of the automobile bumper beam assembly.

Description

Technical Field

[0001] The invention relates to the technical field of automobile bumper crossbeam assembly manufacturing, in particular to an automobile bumper crossbeam assembly automatic welding device and a welding method. Background Art

[0002] The automobile bumper beam assembly is one of the core structural components in the automobile bumper system. It is used to absorb and disperse collision energy to protect the safety of the automobile body and occupants. It is usually composed of a beam, an energy absorption box and related connecting parts. It is an important part of the automobile anti-collision system. In order to ensure that the automobile bumper beam assembly has good integrity and strength, it is necessary to weld the automobile bumper beam and the energy absorption box during the production process so that the automobile bumper beam assembly can effectively absorb and disperse collision energy, thereby improving the safety performance of the vehicle.

[0003] At present, there are the following shortcomings when welding automobile bumper beams and energy absorption boxes: 1. Before welding the automobile bumper beam, the bumper beam must be fixed first, and the traditional method usually requires the use of multiple clamping components to cooperate with each other to complete the fixing operation, but the adjustment of multiple clamping points increases production time and reduces production efficiency. At the same time, the consistency and accuracy of the clamping position are difficult to guarantee, which will affect the welding quality of the automobile bumper beam assembly; 2. After the fixture fixes the beam and the energy absorption box, each part of the fixture is independent of each other. Due to the lack of unified support and constraint of multiple fixtures, the fixtures cannot be accurately aligned, which affects the accuracy and quality of subsequent welding. In addition, independent fixtures cannot effectively resist vibration and mechanical shock during the welding process, which will cause the beam and the energy absorption box to shake easily, further affecting the subsequent welding quality. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an automatic welding device and a welding method for an automobile bumper beam assembly, which are achieved by the following specific technical means: an automatic welding device for an automobile bumper beam assembly, comprising a base, a fixture seat is fixedly installed on the upper end surface of the base, a welding robot arm is fixedly installed on the upper end surface of the base and is located in front of the fixture seat and is symmetrical on the left and right, and a supporting mechanism is arranged on the fixture seat; the supporting mechanism comprises a supporting part arranged on the fixture seat and used for limiting support of the bumper beam, and a supporting part used for limiting support of the left and right sides of the lower end surface of the beam.

[0005] The supporting part is provided with a limiting mechanism for cooperating with the supporting part to fit and fix the upper end surface of the beam; the limiting mechanism includes a pressing part arranged on the supporting part, a left-right symmetrical hinge rod is arranged between the pressing part and the supporting part, the pressing part is provided with an executing part and a cooperating part for providing power to the executing part, and the executing part is provided with a positioning part for implementing internal expansion of the beam hole groove to correct the position of the beam.

[0006] The supporting part is also provided with an alignment mechanism for supporting the energy absorption box; the alignment mechanism includes an alignment part arranged on the supporting part and used to cooperate with the pressing part to lock the position between the cross beam and the energy absorption box, and a locking part is arranged on the alignment part, and the locking part includes a locking horizontal plate placed on the clamp seat and used to lock the supporting part.

[0007] The supporting mechanism, the limiting mechanism and the alignment mechanism cooperate with each other to implement integrated clamping and fixing of the cross beam and the energy absorption box. The left-right symmetrical hinged rods and the locking cross plate provide trapezoidal support for the equipment.

[0008] As a preferred technical solution of the present invention, the supporting part includes a vertical plate, a supporting plate and a matching hole. The vertical plate is fixedly installed on the upper end surface of the clamp seat, and the supporting plate is fixedly installed on the front end surface of the vertical plate. A limit block for limiting the position of the cross beam is arranged on the front side of the upper end surface of the supporting plate, and a matching hole is opened through the rear side of the upper end surface of the supporting plate.

[0009] As a preferred technical solution of the present invention, the support part also includes a first slide rail, a first bidirectional screw, a sliding seat and an irregular bracket. The upper end surface of the clamp seat is fixedly installed with the first slide rail located directly below the limit block, and the first bidirectional screw is installed through the first slide rail through a bearing. The upper end surface of the first slide rail is slidably installed with a sliding seat that is symmetrical on the left and right and threadedly connected to the first bidirectional screw, and the upper end surface of the sliding seat is fixedly installed with a front-to-back symmetrical irregular bracket, and a trapezoidal structure is formed between the upper end of the irregular bracket and the crossbeam.

[0010] As a preferred technical solution of the present invention, the lower pressure part includes a second slide rail, a T-shaped pressure plate, a pressure block and an alignment column. The front end surface of the vertical plate is fixedly installed with the second slide rail located above the supporting plate, and the front end surface of the second slide rail is slidably installed with a T-shaped pressure plate with a cavity inside. The left and right end surfaces of the T-shaped pressure plate are fixedly installed with pressure blocks through the arranged support rods, and the lower end surface of the T-shaped pressure plate is fixedly installed with an alignment column located in the matching hole, and the front side of the lower end surface of the alignment column is chamfered, the rear end surface of the sliding seat is hinged to the corresponding hinged rod by the arranged support seat, and the rear end surface of the transverse section of the T-shaped pressure plate is hinged to the corresponding upper end of the hinged rod by the arranged support seat.

[0011] As a preferred technical solution of the present invention, the execution part includes a limit slide groove, a second bidirectional screw and a limit slider. The lower end surface of the T-shaped pressure plate is penetrated by a left-right symmetrical limit slide groove. The T-shaped pressure plate is rotatably installed with a second bidirectional screw corresponding to the limit slide groove one by one through a bearing seat. The limit slide groove is slidably installed with a left-right symmetrical limit slider threadedly connected to the corresponding second bidirectional screw. The ends of the second bidirectional screws close to each other are fixedly sleeved with a first gear.

[0012] As a preferred technical solution of the present invention, the mating part includes a rack and a limit plate. The upper end surface of the T-shaped pressure plate is slidably installed with a rack that passes through its lower end surface and is symmetrical on the left and right. The rack is meshingly connected with the corresponding first gear. The front end surface of the vertical plate is fixedly installed with a limit plate located above the symmetrical rack by setting a support arm.

[0013] As a preferred technical solution of the present invention, the positioning portion includes an expansion rod, and the opposite ends of the left-right symmetrical limit sliding blocks on the same limit sliding groove are hinged with front-and-back symmetrical expansion rods through a torsion spring rod, and a rubber column is fixedly installed on one end of the expansion rod away from the corresponding limit sliding block.

[0014] As a preferred technical solution of the present invention, the alignment part includes an electric slide rail, a T-shaped carrier plate, a fixed seat, an insertion rod, a connecting plate and an electric push rod. The front end surface of the vertical plate is fixedly installed with an electric slide rail located below the supporting plate, the moving end of the electric slide rail is fixedly installed with a T-shaped carrier plate, the upper end surface of the transverse section of the T-shaped carrier plate is fixedly installed with a fixed seat which is symmetrical on the left and right and is used to implement limited support for the energy absorption box, a socket corresponding to the matching hole is provided on the T-shaped carrier plate, a left-right symmetrical positioning groove is provided at the front end of the alignment column, a plug rod which penetrates the front end surface of the socket and corresponds to the positioning groove one by one is slidably installed on the front end surface of the T-shaped carrier plate, the front ends of the left-right symmetrical plug rods are jointly fixedly installed with a connecting plate, a spring mounted on the plug rod is fixedly installed between the connecting plate and the front end surface of the T-shaped carrier plate, and an electric push rod with its output end facing the connecting plate is fixedly installed on the lower end surface of the T-shaped carrier plate.

[0015] As a preferred technical solution of the present invention, the locking part also includes a sliding column, a locking rod and a matching block. A left-right symmetrical sliding column is fixedly installed at the center of the upper end surface of the locking cross plate, and a supporting protrusion corresponding to the sliding column is fixedly installed on the rear end surface of the T-shaped carrier plate. The upper end of the sliding column slides through the corresponding supporting protrusion, and a limiting circular plate is fixedly installed on the upper end of the sliding column. Two locking rods located on the back sides of the left-right symmetrical sliding columns are fixedly installed on the upper end surface of the locking cross plate, and a matching block that is plugged into and cooperates with the corresponding locking rod is fixedly installed on the sliding seat.

[0016] As a preferred technical solution of the present invention, the present invention also provides a welding method using the above-mentioned automobile bumper beam assembly automatic welding equipment. The specific welding method includes the following steps: S1: Preparation: Check whether the size and shape of the bumper beam and the energy absorption box meet the specifications, and clean the surface of the components.

[0017] S2: Positioning and fixing: The crossbeam and the energy absorption box are clamped and fixed in an integrated manner through the cooperation of the supporting mechanism, the limiting mechanism and the alignment mechanism.

[0018] S3: Welding: The bumper beam and the energy absorption box fixed in step S2 are welded by a welding robot.

[0019] S4: Allow to cool: After welding is completed, allow the welded area between the bumper beam and the energy absorption box to cool naturally.

[0020] S5: Inspection and finishing: Visually inspect the weld quality to see if there are defects such as pores and cracks. Grind and trim the weld if necessary to ensure a smooth surface.

[0021] Compared with the prior art, the present invention has the following beneficial effects: 1. The automatic welding equipment and method for the automobile bumper beam assembly, through the coordinated use of the supporting mechanism, the limiting mechanism and the alignment mechanism, adopts a comprehensive operation model of supporting, limiting and alignment to complete the rapid welding of the automobile bumper beam and the energy absorption box after integrated clamping and fixation. First, the position of the beam is accurately corrected by the pressure limiting and internal expansion of the upper and lower end surfaces of the beam to ensure the accurate alignment of the beam and the energy absorption box. At the same time, the trapezoidal structure support is used to enhance the overall stability, reduce vibration and deformation during welding, and evenly disperse stress to avoid deformation caused by thermal stress. Therefore, the uniformity and consistency of the welding seam are achieved through the mutual cooperation of the mechanisms, which significantly improves the overall welding quality and strength. At the same time, the operation process is simplified to improve the production efficiency of the automobile bumper beam assembly.

[0022] 2. The automatic welding equipment and method for the automobile bumper beam assembly can simultaneously implement pressure limiting on the upper and lower end surfaces of the bumper beam through the coordinated use of the supporting mechanism and the limiting mechanism to maintain the structural form of the bumper beam, and can provide additional support for the beam, enhance the overall stability of the beam, and avoid vibration and displacement during the welding process, thereby ensuring the uniformity and consistency of the welding seam, thereby improving the overall welding quality and strength.

[0023] 3. The automatic welding equipment and method for the automobile bumper beam assembly, through the setting of the limiting mechanism, implements internal expansion of the beam hole groove to correct the beam position during the fixing process, so as to accurately adjust the position of the beam and ensure that it is more accurately aligned with the energy absorption box, thereby improving the quality and strength of the weld. In addition, the internal expansion can evenly distribute the stress and avoid deformation of the bumper beam assembly due to thermal stress during the welding process.

[0024] 4. The automatic welding equipment and method for the automobile bumper beam assembly, through the coordinated use of the set limiting mechanism and the positioning mechanism, after the beam and the energy absorption box are fixed, the hinged rods and the locking cross plates on both sides provide trapezoidal support for subsequent welding. The trapezoidal support structure has higher stability and can effectively reduce vibration and deformation during welding. The trapezoidal support can more evenly disperse the stress generated during welding and reduce the risk of local stress concentration, thereby providing unified support and constraint for the fixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention when it is working.

[0026] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention.

[0027] Figure 3 It is a schematic diagram of a partial three-dimensional structure of the initial state of the present invention.

[0028] Figure 4 It is a schematic diagram of the three-dimensional structure of the supporting mechanism of the present invention.

[0029] Figure 5 It is a partial three-dimensional structural schematic diagram of the limiting mechanism of the present invention.

[0030] Figure 6 It is a bottom-up stereoscopic structural schematic diagram of the limiting mechanism of the present invention.

[0031] Figure 7 for Figure 5 Schematic diagram of the enlarged structure at point A in the middle.

[0032] Figure 8 It is a partial cross-sectional three-dimensional structural schematic diagram of the alignment mechanism of the present invention.

[0033] Fig. 9 It is a schematic diagram of the three-dimensional structure of the automobile bumper beam assembly.

[0034] In the figure: 1, base; 2, fixture seat; 3, welding robot arm; 4, supporting mechanism; 41, supporting part; 411, vertical plate; 412, supporting plate; 413, matching hole; 42, supporting part; 421, first slide rail; 422, first bidirectional screw; 423, slide seat; 424, special bracket; 425, hinge rod; 5, limiting mechanism; 51, pressing part; 511, second slide rail; 512, T-type pressure plate; 513, pressing block; 514, alignment column; 52, execution part; 5 21. Limiting slide groove; 522. Second bidirectional screw rod; 523. Limiting slider; 53. Matching part; 531. Rack; 532. Limiting plate; 54. Positioning part; 541. Expansion rod; 6. Alignment mechanism; 61. Alignment part; 611. Electric slide rail; 612. T-type carrier plate; 613. Fixed seat; 614. Insertion rod; 615. Connecting plate; 616. Electric push rod; 62. Locking part; 621. Sliding column; 622. Locking cross plate; 623. Locking rod; 624. Matching block. DETAILED DESCRIPTION

[0035] 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 described embodiments 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.

[0036] See also Figure 1 and Figure 2 An automatic welding device for an automobile bumper beam assembly includes a base 1, a fixture seat 2 is fixedly installed on the upper end surface of the base 1, a welding robot arm 3 is fixedly installed on the upper end surface of the base 1 and is located in front of the fixture seat 2 and is symmetrical on the left and right, and a supporting mechanism 4 is arranged on the fixture seat 2; the supporting mechanism 4 includes a supporting part 41 arranged on the fixture seat 2 and used for limiting the support of the bumper beam, and a supporting part 42 used for limiting the support of the left and right sides of the lower end surface of the beam.

[0037] See also Figure 1 , Figure 2 , Figure 3 and Figure 5 The supporting part 41 is provided with a limiting mechanism 5 for cooperating with the supporting part 42 to fit and fix the upper end surface of the beam; the limiting mechanism 5 includes a pressing part 51 arranged on the supporting part 41, a left-right symmetrical hinge rod 425 is arranged between the pressing part 51 and the supporting part 42, the pressing part 51 is provided with an executing part 52 and a matching part 53 for providing power to the executing part 52, and the executing part 52 is provided with a positioning part 54 for implementing internal expansion of the beam hole groove to correct the position of the beam.

[0038] See also Figure 1 , Figure 2 and Figure 8 The supporting portion 41 is also provided with an alignment mechanism 6 for supporting the energy absorbing box; the alignment mechanism 6 includes an alignment portion 61 arranged on the supporting portion 41 and used to cooperate with the pressing portion 51 to lock the position between the cross beam and the energy absorbing box, and a locking portion 62 is arranged on the alignment portion 61, and the locking portion 62 includes a locking horizontal plate 622 placed on the clamp seat 2 and used to lock the supporting portion 42.

[0039] The supporting mechanism 4, the limiting mechanism 5 and the alignment mechanism 6 cooperate with each other to implement integrated clamping and fixing of the cross beam and the energy absorption box, and the left-right symmetrical hinge rod 425 and the locking cross plate 622 provide trapezoidal support for the equipment.

[0040] See also Figure 2 , Figure 3 and Figure 4 The supporting part 41 includes a vertical plate 411, a supporting plate 412 and a matching hole 413. The vertical plate 411 is fixedly installed on the upper end surface of the clamp seat 2, and the supporting plate 412 is fixedly installed on the front end surface of the vertical plate 411. A limiting block for limiting the cross beam is arranged on the front side of the upper end surface of the supporting plate 412, and a matching hole 413 is opened through the rear side of the upper end surface of the supporting plate 412.

[0041] See also Figure 2 , Figure 3 and Figure 4 The support portion 42 also includes a first slide rail 421, a first bidirectional screw 422, a slide seat 423 and an irregular bracket 424. The upper end surface of the clamp seat 2 is fixedly installed with the first slide rail 421 located directly below the limit block. The first bidirectional screw 422 is installed through the first slide rail 421 through a bearing. The upper end surface of the first slide rail 421 is slidably installed with a slide seat 423 that is symmetrical left and right and threadedly connected to the first bidirectional screw 422. The upper end surface of the slide seat 423 is fixedly installed with an irregular bracket 424 that is symmetrical front and back. A trapezoidal structure is formed between the upper end of the irregular bracket 424 and the crossbeam.

[0042] See also Figure 2 , Figure 4 , Figure 5 and Figure 6The lower pressing part 51 includes a second slide rail 511, a T-shaped pressure plate 512, a pressure block 513 and an alignment column 514. The front end surface of the vertical plate 411 is fixedly installed with the second slide rail 511 located above the supporting plate 412, and the front end surface of the second slide rail 511 is slidably installed with a T-shaped pressure plate 512 with a cavity inside. The left and right end surfaces of the T-shaped pressure plate 512 are fixedly installed with pressure blocks 513 through the provided support rods. The lower end surface of the T-shaped pressure plate 512 is fixedly installed with an alignment column 514 located in the matching hole 413, and the front side of the lower end surface of the alignment column 514 is chamfered. The rear end surface of the slide seat 423 is hinged to the corresponding hinge rod 425 by providing a support seat, and the rear end surface of the transverse section of the T-shaped pressure plate 512 is hinged to the corresponding upper end of the hinge rod 425 by providing a support seat.

[0043] During the specific work, when welding the automobile bumper beam assembly, the beam is first placed in the limit block on the support plate 412 to provide support and limit for the beam, and then the external motor fixedly installed on the first slide rail 421 is started to rotate the first bidirectional screw 422 to move the slide 423 to both sides on the first slide rail 421 synchronously. When the slide 423 reaches both sides of the beam with the corresponding special-shaped bracket 424, the upper end of the special-shaped bracket 424 will support the arc-shaped part of the beam from the lower end.

[0044] During the synchronous approach of the slide 423, the slide 423 will pull the T-shaped pressure plate 512 downward through the corresponding hinge rod 425, and the second slide rail 511 will limit the moving direction of the T-shaped pressure plate 512. When the special bracket 424 moves to the arc-shaped part of the beam, the lower end surface of the T-shaped pressure plate 512 fits with the upper end surface of the beam. At this time, the external motor can be stopped, and the pressure blocks 513 on both sides will press the arc-shaped part of the beam from the upper end, so that the upper and lower end surfaces of the bumper beam can be simultaneously pressed and limited, maintaining the structural form of the bumper beam, and enhancing the overall stability of the beam, avoiding vibration and displacement during welding, thereby ensuring the uniformity and consistency of the weld.

[0045] When the T-shaped pressing plate 512 descends, the alignment post 514 will be brought through the matching hole 413. After the crossbeam is fixed, the position of the alignment post 514 is also fixed.

[0046] See also Figure 5 , Figure 6 and Figure 7The actuator 52 includes a limiting groove 521, a second bidirectional screw 522 and a limiting slider 523. The lower end surface of the T-shaped pressure plate 512 is penetrated with a left-right symmetrical limiting groove 521. The T-shaped pressure plate 512 is rotatably installed with a second bidirectional screw 522 corresponding to the limiting groove 521 through a bearing seat. The limiting groove 521 is slidably installed with a left-right symmetrical limiting slider 523 threadedly connected to the corresponding second bidirectional screw 522. The ends of the second bidirectional screws 522 that are close to each other are fixedly sleeved with a first gear.

[0047] See also Figure 2 , Figure 3 , Figure 5 and Figure 7 The mating portion 53 includes a rack 531 and a limit plate 532. The upper end surface of the T-shaped pressure plate 512 is slidably mounted with a rack 531 that passes through its lower end surface and is symmetrical on the left and right. The rack 531 is meshed and connected with the corresponding first gear. The front end surface of the vertical plate 411 is fixedly mounted with a limit plate 532 located above the symmetrical rack 531 by setting a support arm.

[0048] See also Figure 5 and Figure 6 The positioning portion 54 includes an expansion rod 541. The opposite ends of the left-right symmetrical limit sliders 523 on the same limit slide groove 521 are hinged with front-to-back symmetrical expansion rods 541 through a set torsion spring rod. A rubber column is fixedly installed on one end of the expansion rod 541 away from the corresponding limit slider 523.

[0049] When the T-shaped pressure plate 512 is in contact with the cross beam, the T-shaped pressure plate 512 will move with the expansion rod 541 into the cross beam hole groove, and the lower end of the rack 531 will first contact the upper end surface of the cross beam. At this time, the rack 531 cannot move downward any further, so that when the T-shaped pressure plate 512 continues to move downward with the second bidirectional screw rod 522, the rack 531 cooperates with the first gear to rotate the second bidirectional screw rod 522, so that the two limit sliders 523 in the same limit slide groove 521 move away synchronously. At the same time, the limit slider 523 will bring the front and rear symmetrical expansion rods 541 to contact the inner side wall of the cross beam hole groove first, and in the process of the limit slider 523 moving to both sides, the expansion rod 541 will rotate with the torsion spring rod as the center point. When the T-shaped pressure plate 512 is in contact with the cross beam, the rubber column on the expansion rod 541 will rest on the diagonal of the cross beam hole groove, so as to correct the position of the cross beam by implementing internal expansion of the cross beam hole groove, and accurately adjust the position of the cross beam.

[0050] When the fixation of the crossbeam is released, the slide seats 423 on both sides approach each other synchronously to move the T-shaped pressure plate 512 upward, and the T-shaped pressure plate 512 will move the expansion rod 541 away from the crossbeam hole groove. At the same time, during the upward movement of the T-shaped pressure plate 512, the rack 531 will remain motionless due to its own gravity, and when the T-shaped pressure plate 512 contacts the upper end of the rack 531, it will move upward synchronously with the rack 531 again. If the rack 531 moves upward synchronously due to the friction between the first gear and the second bidirectional screw 522, the T-shaped pressure plate 512 will bring the upper end of the rack 531 to contact the limit plate 532, thereby pushing the rack 531 downward and rotating the second bidirectional screw 522 in the opposite direction, thereby resetting the limit slider 523. At this time, the squeezing of the expansion rod 541 disappears, so that the expansion rod 541 is reset under the action of the torsion spring rod.

[0051] See also Figure 2 , Figure 3 and Figure 8 The alignment part 61 includes an electric slide rail 611, a T-shaped carrier plate 612, a fixed seat 613, a plug rod 614, a connecting plate 615 and an electric push rod 616. The front end surface of the vertical plate 411 is fixedly installed with an electric slide rail 611 located below the supporting plate 412. The moving end of the electric slide rail 611 is fixedly installed with a T-shaped carrier plate 612. The upper end surface of the transverse section of the T-shaped carrier plate 612 is fixedly installed with a fixed seat 613 that is symmetrical on both sides and used to implement limited support for the energy absorption box. The T-shaped carrier plate 612 is provided with a fixed seat 613 that matches the fixed seat 613. The socket corresponding to the hole 413 and the front end of the alignment column 514 are provided with left-right symmetrical positioning grooves, and the front end surface of the T-shaped carrier 612 is slidably installed with an insertion rod 614 that penetrates the front end surface of the socket and corresponds to the positioning groove one by one, and the front ends of the left-right symmetrical insertion rods 614 are jointly fixedly installed with a connecting plate 615, and a spring mounted on the insertion rod 614 is fixedly installed between the connecting plate 615 and the front end surface of the T-shaped carrier 612, and an electric push rod 616 with the output end facing the connecting plate 615 is fixedly installed on the lower end surface of the T-shaped carrier 612.

[0052] See also Figure 2 , Figure 3 , Figure 4 and Figure 8 The locking portion 62 also includes a sliding column 621, a locking rod 623 and a matching block 624. A sliding column 621 that is symmetrical on both sides is fixedly installed at the center of the upper end surface of the locking cross plate 622. A supporting protrusion that corresponds to the sliding column 621 is fixedly installed on the rear end surface of the T-shaped carrier plate 612. The upper end of the sliding column 621 slides through the corresponding supporting protrusion. A limited circular plate is fixedly installed on the upper end of the sliding column 621. Two locking rods 623 that are respectively located on the back sides of the sliding columns 621 that are symmetrical on both sides are fixedly installed on the upper end surface of the locking cross plate 622. A matching block 624 that is plugged in and out with the corresponding locking rod 623 is fixedly installed on the sliding seat 423.

[0053] During the specific work, after the fixation of the crossbeam is completed, the energy absorption boxes on both sides are placed on the fixing seat 613 respectively, and the limit blocks set on the upper end surface of the fixing seat 613 limit the energy absorption boxes, and then the electric slide rail 611 is started to move it with the T-shaped carrier plate 612 upward, so that the energy absorption boxes on both sides are lifted upward and aligned with the crossbeam. In this process, the jack on the T-shaped carrier plate 612 will pass through the alignment column 514, and the insertion rod 614 will always fit the front end surface of the alignment column 514 under the action of the spring. When the insertion rod 614 reaches the positioning groove of the alignment column 514, the insertion rod 614 will be inserted into the positioning groove, thereby locking the position of the T-shaped carrier plate 612 through the T-shaped pressure plate 512, thereby locking the position of the energy absorption box, thereby determining the position of the energy absorption box and the crossbeam, and fixing the crossbeam and the energy absorption box, and then the connection between the two can be welded by the welding robot arm 3.

[0054] During the upward movement of the T-shaped carrier 612, the supporting protrusion will first slide a certain distance relative to the sliding column 621. When the supporting protrusion contacts the limiting circular plate at the upper end of the sliding column 621, it will move upward with the locking cross plate 622 and insert the locking rod 623 into the matching block 624 of the sliding seat 423, so as to lock the sliding seats 423 on both sides. At this time, the hinged rods 425 and the locking cross plates 622 on both sides provide trapezoidal support for subsequent welding to reduce vibration and deformation during welding, thereby providing unified support and constraint for the fixture.

[0055] When the lock between the T-shaped carrier plate 612 and the T-shaped pressure plate 512 is released, the electric push rod 616 is activated to extend and push the connecting plate 615 forward, thereby pulling the insertion rod 614 out of the positioning groove, and the T-shaped carrier plate 612 can move up and down again.

[0056] See also Figures 1 to 9 The present invention also provides a welding method using the above-mentioned automobile bumper beam assembly automatic welding equipment. The specific welding method includes the following steps: S1: Preparation: Check whether the size and shape of the bumper beam and the energy absorption box meet the specifications, and clean the surface of the components.

[0057] S2: Positioning and fixing: first place the cross beam in the limit block on the support plate 412, and use the support part 42 and the pressing part 51 to synchronously implement the pressure limit on the upper and lower end surfaces of the bumper cross beam, and use the limiting mechanism 5 to expand the cross beam hole groove internally to correct the cross beam position, and accurately adjust the position of the cross beam, thereby completing the fixation of the cross beam.

[0058] Then, the energy absorption boxes on both sides are placed on the fixed seat 613 respectively, and the electric slide rail 611 is started to move it with the T-shaped carrier 612, and the position of the T-shaped carrier 612 is locked by the T-shaped pressure plate 512, so as to lock the position of the energy absorption box, thereby determining the position of the energy absorption box and the beam, and fixing the beam and the energy absorption box, and then the connection between the two can be welded by the welding robot arm 3.

[0059] The supporting mechanism 4, the limiting mechanism 5 and the alignment mechanism 6 cooperate with each other to clamp and fix the crossbeam and the energy absorption box in an integrated manner.

[0060] S3: Welding: The bumper beam and the energy absorption box fixed in step S2 are welded by the welding robot arm 3.

[0061] S4: Allow to cool: After welding is completed, allow the welded area between the bumper beam and the energy absorption box to cool naturally.

[0062] S5: Inspection and finishing: Visually inspect the weld quality to see if there are defects such as pores and cracks. Grind and trim the weld if necessary to ensure a smooth surface.

[0063] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic welding device for automobile bumper beam assembly, comprising a base, characterized in that: The upper end surface of the base is fixedly mounted with a fixture seat, the upper end surface of the base is fixedly mounted with a welding mechanical arm located in front of the fixture seat and symmetrical to the left and right, and a supporting mechanism is arranged on the fixture seat; The supporting mechanism includes a supporting part arranged on the fixture seat and used for implementing position limiting support on the bumper beam, and a supporting part used for implementing position limiting support on the left and right sides of the lower end surface of the beam; The supporting part is provided with a limiting mechanism for cooperating with the supporting part to fit and fix the upper end surface of the beam; The limiting mechanism comprises a pressing part arranged on the supporting part, a left-right symmetrical hinge rod is arranged between the pressing part and the supporting part, an execution part and a matching part for providing power to the execution part are arranged on the pressing part, and a positioning part for implementing internal expansion of the beam hole groove to correct the position of the beam is arranged on the execution part; The supporting part is also provided with a positioning mechanism for supporting the energy absorbing box; The alignment mechanism includes an alignment part arranged on the supporting part and used to cooperate with the pressing part to lock the position between the cross beam and the energy absorption box, and a locking part is arranged on the alignment part, and the locking part includes a locking horizontal plate placed on the clamp seat and used to lock the supporting part; The supporting mechanism, the limiting mechanism and the alignment mechanism cooperate with each other to implement integrated clamping and fixing of the cross beam and the energy absorption box. The left-right symmetrical hinged rods and the locking cross plate provide trapezoidal support for the equipment.

2. The automatic welding equipment for automobile bumper beam assembly according to claim 1 is characterized in that: The supporting part includes a vertical plate, a supporting plate and a matching hole. The vertical plate is fixedly installed on the upper end surface of the clamp seat, and the supporting plate is fixedly installed on the front end surface of the vertical plate. A limiting block for limiting the crossbeam is arranged on the front side of the upper end surface of the supporting plate, and a matching hole is opened through the rear side of the upper end surface of the supporting plate.

3. The automatic welding equipment for automobile bumper beam assembly according to claim 2 is characterized in that: The support part also includes a first slide rail, a first bidirectional screw, a slide seat and an irregular bracket. The upper end surface of the clamp seat is fixedly installed with the first slide rail located directly below the limit block. The first bidirectional screw is installed through the first slide rail through a bearing. The upper end surface of the first slide rail is slidably installed with a slide seat that is symmetrical left and right and threadedly connected to the first bidirectional screw. The upper end surface of the slide seat is fixedly installed with a front-to-back symmetrical irregular bracket. The upper end of the irregular bracket and the crossbeam form a trapezoidal structure.

4. The automatic welding equipment for automobile bumper beam assembly according to claim 3 is characterized in that: The downward pressure part includes a second slide rail, a T-shaped pressure plate, a pressure block and an alignment column. The front end surface of the vertical plate is fixedly installed with a second slide rail located above the supporting plate. The front end surface of the second slide rail is slidably installed with a T-shaped pressure plate with a cavity inside. The left and right end surfaces of the T-shaped pressure plate are fixedly installed with pressure blocks through the arranged support rods. The lower end surface of the T-shaped pressure plate is fixedly installed with an alignment column located in the matching hole. The front side of the lower end surface of the alignment column is chamfered. The rear end surface of the sliding seat is hinged to the corresponding hinged rod through the arranged support seat. The rear end surface of the transverse section of the T-shaped pressure plate is hinged to the corresponding upper end of the hinged rod through the arranged support seat.

5. The automatic welding equipment for automobile bumper beam assembly according to claim 4 is characterized in that: The actuator includes a limiting groove, a second bidirectional screw and a limiting slider. The lower end surface of the T-shaped pressure plate is penetrated by a left-right symmetrical limiting groove. A second bidirectional screw corresponding to the limiting groove is rotatably installed in the T-shaped pressure plate through a bearing seat. A left-right symmetrical limiting slider threadedly connected to the corresponding second bidirectional screw is slidably installed in the limiting groove. The ends of the second bidirectional screws close to each other are fixedly sleeved with a first gear.

6. The automatic welding equipment for automobile bumper beam assembly according to claim 5 is characterized in that: The mating part includes a rack and a limit plate. The upper end surface of the T-shaped pressure plate is slidably mounted with a rack that passes through its lower end surface and is symmetrical on the left and right. The rack is meshed and connected with the corresponding first gear. The front end surface of the vertical plate is fixedly mounted with a limit plate located above the symmetrical rack by setting a support arm.

7. The automatic welding equipment for automobile bumper beam assembly according to claim 5 is characterized in that: The positioning part includes an expansion rod. The opposite ends of the left-right symmetrical limit sliders on the same limit slide groove are hinged with front-to-back symmetrical expansion rods through a torsion spring rod. A rubber column is fixedly installed at one end of the expansion rod away from the corresponding limit slider.

8. The automatic welding equipment for automobile bumper beam assembly according to claim 4 is characterized in that: The alignment part includes an electric slide rail, a T-shaped carrier plate, a fixed seat, an insertion rod, a connecting plate and an electric push rod. The front end surface of the vertical plate is fixedly installed with an electric slide rail located below the supporting plate, the moving end of the electric slide rail is fixedly installed with a T-shaped carrier plate, the upper end surface of the transverse section of the T-shaped carrier plate is fixedly installed with a fixed seat which is symmetrical on the left and right and is used to implement limited support for the energy absorption box, a socket corresponding to the matching hole is provided on the T-shaped carrier plate, a left-right symmetrical positioning groove is provided on the front end of the alignment column, a plug rod which penetrates the front end surface of the socket and corresponds to the positioning groove one by one is slidably installed on the front end surface of the T-shaped carrier plate, the front ends of the left-right symmetrical plug rods are jointly fixedly installed with a connecting plate, a spring mounted on the plug rod is fixedly installed between the connecting plate and the front end surface of the T-shaped carrier plate, and an electric push rod with the output end facing the connecting plate is fixedly installed on the lower end surface of the T-shaped carrier plate.

9. The automatic welding equipment for automobile bumper beam assembly according to claim 8 is characterized in that: The locking part also includes a sliding column, a locking rod and a matching block. A sliding column symmetrically installed on the left and right is fixedly installed at the center of the upper end surface of the locking cross plate. A supporting protrusion corresponding to the sliding column is fixedly installed on the rear end surface of the T-shaped carrier plate. The upper end of the sliding column slides through the corresponding supporting protrusion. A limiting circular plate is fixedly installed on the upper end of the sliding column. Two locking rods located on the back sides of the left and right symmetrical sliding columns are fixedly installed on the upper end surface of the locking cross plate. A matching block that is plugged in and matched with the corresponding locking rod is fixedly installed on the sliding seat.

10. An automatic welding method for automobile bumper beam assembly, which is completed by using the automatic welding equipment for automobile bumper beam assembly as claimed in claim 1, characterized in that: The specific welding method includes the following steps: S1: Preparation: Check whether the size and shape of the bumper beam and energy absorption box meet the specifications, and clean the surface of the components; S2: Positioning and fixing: The crossbeam and the energy absorption box are clamped and fixed in an integrated manner through the cooperation of the supporting mechanism, the limiting mechanism and the alignment mechanism; S3: welding: welding the bumper beam and the energy absorption box fixed in step S2 by a welding robot arm; S4: Cooling: After welding is completed, let the welding part between the bumper beam and the energy absorption box cool naturally; S5: Inspection and finishing: Visually inspect the weld quality to see if there are pores or cracks. Grind and finish the weld if necessary to ensure a smooth surface.

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