An automatic production line for automobile body steel-aluminum hybrid front longitudinal beams

Abstract

The present invention belongs to the technical field of automobile body parts production, and in particular relates to an automatic production line for a hybrid steel-aluminum front longitudinal beam of an automobile body. The production line includes a MIG welding station for the longitudinal beam body, a spot welding station for the front floor connecting to the inner panel, an FDS spotting station for the front floor connecting to the inner panel, a FDS repair welding station for the front floor connecting to the inner panel, a FDS repair welding station for the front floor connecting to the outer panel, an assembly spot welding station, an assembly spot welding repair welding station, and a product measurement and inspection station. The production line has a linear layout, with all manual on-line stations, robot on-line stations, and assembly product off-line stations located on the same side. Semi-finished products within the production line are transported and transferred using AGV carts and robots. The production line is equipped with a visual real-time gluing quality inspection and a production data acquisition and management system. The production line can produce both left and right front longitudinal beams in a mixed line. It can also realize the rapid switching of fixtures for other models or products outside the line and the production line changeover, further improving equipment utilization and reducing production line costs.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile body parts production, and relates to an automatic production line for a steel-aluminum hybrid front longitudinal beam of an automobile body. Background Art

[0002] The front longitudinal beam is a crucial component of the vehicle's lower engine compartment, carrying heavier components like the engine and battery. During a head-on collision, the left and right front longitudinal beams are the primary bearers of longitudinal forces, carrying approximately 70% of the force. Therefore, vehicle structural design requires that the front longitudinal beam be strong enough to support the weight of the vehicle body and key components, ensuring frame stability, while also possessing excellent energy absorption capabilities. This ensures that, in a head-on collision, the front section of the beam can deform to absorb energy, while maintaining a stable rear end to minimize cockpit deformation and protect occupants.

[0003] With the advancement of lightweight vehicle body technology, traditional carbon steel front longitudinal beams are gradually being replaced by steel-aluminum hybrid structures. These hybrid front longitudinal beams typically consist of a main longitudinal beam, a front floor panel connecting the outer and inner panels, and several smaller components connecting the cabin. The main longitudinal beam is constructed from aluminum alloy, while the remaining components are made of carbon steel. Joining techniques include steel spot welding, aluminum alloy arc welding, adhesive bonding, FDS (Fused Deformed Screws), stud welding, and riveting. Traditional carbon steel front longitudinal beams are mainly produced by resistance spot welding, with a single connection process. Robot workstations are generally used in production. If the production of steel-aluminum hybrid front longitudinal beams follows this model, many problems will arise. First, there are too many operators, and there are many types of connection processes for steel-aluminum hybrid front longitudinal beams. Each process must be completed in a separate workstation, and the workstation workpiece placement requires specialized personnel, so the number of operators increases significantly; secondly, production logistics are complex, and the production of steel-aluminum hybrid front longitudinal beams requires multiple processes. If the workstation model is used for production, a large amount of semi-finished product inventory will be generated, and logistics turnover will also occupy a lot of manpower and resources, and production organization will easily become chaotic; thirdly, product quality control is difficult, and discrete workstations cannot effectively collect process parameter information, which is prone to quality defects and difficult to trace data. Adding manual quality inspection of semi-finished products between processes will greatly increase costs; finally, the equipment investment and floor space are large, and the overall degree of production automation, informatization, intelligence and flexibility are relatively poor.

[0004] Through searching, we found the following patent documents related to this application, and their specific contents:

[0005] Chinese Patent Publication No.: CN110355577A discloses a flexible automatic production line for the left front longitudinal beam of an automobile, including a PLC control device, a zone one production line, a zone two production line, and a zone three production line; the zone one production line, the zone two production line, and the zone three production line are respectively provided with multiple loading stations, multiple welding stations, multiple handling stations, and unloading stations; the loading station is provided with a manual loading platform, the manual loading platform is provided with a fixture switching device with a loading detection sensor and a fixture storage device for placing several types of fixtures; the welding station is provided with a welding robot, a gripper storage rack for placing several types of grippers and a fixed welding gun; the handling station is provided with a handling robot; the zone one production line also includes a gluing station equipped with a gluing machine and a conveying station equipped with a conveyor belt; the zone three production line also includes an arc welding workbench equipped with an arc welding machine and a movable slide; it can be seen that the left and right parts of the automobile front longitudinal beam described in the invention are produced by separate production lines, resulting in a large workshop area and low equipment utilization. Summary of the Invention

[0006] The present invention aims to address the deficiencies of the existing technology and provides an automatic production line for automobile body steel-aluminum hybrid front longitudinal beams, which can produce left and right front longitudinal beams in a mixed line and is compatible with the production of similar workpieces for different models, greatly improving equipment utilization.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] An automatic production line for automobile body steel-aluminum hybrid front longitudinal beams, including

[0009] The longitudinal beam body MIG welding station, which is connected to the front floor inner panel FDS point fixed station, uses an AGV car to transfer the longitudinal beam body parts semi-finished products, including laser coding equipment for coding the longitudinal beam body workpiece and scanning equipment for scanning and recording;

[0010] The front floor connecting inner panel spot welding station, which is connected to the front floor connecting inner panel FDS point fixing station, uses a transfer handling robot to transfer workpieces. It includes a first spot welding handling robot, a first automatic glue extrusion system, and a second servo turntable for manual pick-up and placement and spot welding operations;

[0011] The front floor inner panel FDS point-fixing station and the front floor inner panel FDS repair welding station are connected by the first seven-axis handling robot for workpiece transfer, including the left front longitudinal beam, the right front longitudinal beam and two sets of welding fixtures. The working area of ​​the first seven-axis handling robot is equipped with a manual riveting station and three sets of loading slides;

[0012] The front floor is connected to the inner panel FDS repair welding station. The second seven-axis handling robot is used to transfer workpieces to the front floor connection outer panel FDS station. It includes a second FDS robot and two sets of welding fixtures for FDS repair welding operations.

[0013] The front floor is connected to the outer panel FDS station, which is connected to the assembly spot welding station through the third spot welding handling robot for workpiece transfer, including two third FDS robots and the third servo turntable;

[0014] The assembly spot welding station, the assembly spot welding and repair welding station, and the product measurement and inspection station are used to transfer workpieces through an eight-axis spot welding handling robot, including a third spot welding handling robot for spot welding operations;

[0015] The assembly spot welding and repair welding station, which, together with the assembly spot welding station and the product measurement and inspection station, transfers workpieces via an eight-axis spot welding handling robot. The eight-axis spot welding handling robot comprises a fourth servo turntable and a first fixed spot welding clamp. The fourth servo turntable is equipped with a nut plate connecting the front floor to the outer plate.

[0016] The product measurement and inspection station, which, together with the assembly spot welding station and the assembly spot welding repair station, transfers workpieces through an eight-axis spot welding handling robot, includes a set of visual measurement robots, two sets of product offline slides, and two sets of visual measurement fixtures, wherein the visual measurement fixtures are fixedly installed on the ground.

[0017] Moreover, the fixtures at each workstation are equipped with guiding, positioning and fixing mechanisms for switching fixtures of other products, and each workstation is located on the same side of the production line.

[0018] Furthermore, the first automatic glue extrusion system, the second automatic glue extrusion system and the third automatic glue extrusion system are all provided with a servo quantitative mechanism and a real-time visual detection system for alarming quality defects generated during the gluing process.

[0019] Moreover, when the product measurement and inspection station is operating, the visual measurement robot automatically takes pictures and then the visual system measures key dimensions.

[0020] Moreover, the laser coding equipment codes the product and scans the code at the longitudinal beam body MIG welding station, the first seven-axis handling robot and the longitudinal beam body parts loading station.

[0021] Moreover, the automatic production line of the automobile body steel-aluminum hybrid front longitudinal beam is also provided with a data acquisition and management system for identifying product information based on the scanned code information and associating the data uploaded by the production equipment.

[0022] Moreover, the defective products generated during the gluing, FDS and other processes are placed by the first handling robot, the second handling robot and the eight-axis spot welding handling robot to the nearest defective product unloading station for unloading, and the products that need to be repaired are also unloaded from the corresponding defective product unloading station.

[0023] Moreover, the spot welding tongs held by the first spot welding transport robot, the third spot welding transport robot and the eight-axis spot welding transport robot are all equipped with a parts gripper mechanism for grabbing the workpiece for transporting, gluing, spot welding and repair welding operations.

[0024] Moreover, the gripping mechanisms all adopt a polyhedron structure for being compatible with gripping a variety of parts and semi-finished workpieces.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The automobile front longitudinal beam product involved in the automatic production line of the automobile body steel-aluminum hybrid front longitudinal beam described in the present invention is a lightweight body structure, and the material is a mixture of carbon steel and aluminum alloy. In addition to the same metal connection processes such as carbon steel spot welding and aluminum alloy arc welding, it also includes steel and aluminum dissimilar materials connection processes. Different from the traditional single material structure product single process production line, it further improves the production quality.

[0027] The automatic production line for the steel-aluminum hybrid front longitudinal beams of automobile bodies described in the present invention integrates the left and right front longitudinal beams into one production line, and can also be compatible with the production of similar products of different models, with higher flexibility. At the same time, it reduces the use of floor space and further improves the utilization rate of equipment.

[0028] The automatic production line for the steel-aluminum hybrid front longitudinal beam of an automobile body described in the present invention is equipped with a product measurement and inspection station at the last station, which uses machine vision measurement to inspect the key external dimensions of the product, the position and size of the holes, the type and quantity of standard parts, etc., further achieving 100% full inspection of the product and improving measurement efficiency.

[0029] During the gluing process, FDS process and spot welding process of the present invention, if an abnormality occurs in the equipment, a fault alarm signal will be automatically sent to the PLC system and process parameter information will be uploaded. The PLC system controls the handling robot to grab the workpiece from the faulty workstation and place it on the nearest product offline slide. The defective product fault information and rework suggestions are manually queried through the all-in-one machine. The reworked workpiece is manually placed back to the defective product offline workstation. After grabbing the workpiece, the handling robot scans the QR code to confirm the workpiece information and queries its fault information. According to the preset reworked workpiece re-online program, the production process is continued from the correct workstation, further improving the utilization rate of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall structure of an automatic production line for a steel-aluminum hybrid front longitudinal beam of an automobile body according to the present invention;

[0031] Figure 2 This is a schematic diagram of the front station structure of the front longitudinal beam automatic production line of the present invention;

[0032] Figure 3This is a schematic diagram of the structure of the middle station of the automatic production line for the front longitudinal beam of the present invention;

[0033] Figure 4 This is a schematic diagram of the rear station structure of the front longitudinal beam automatic production line of the present invention;

[0034] Among them: 1-automobile body front longitudinal beam automatic production line, 2-longitudinal beam body MIG welding station, 201-laser coding equipment, 202-bar scanning equipment, 203-first servo turntable, 204-welding robot, 205-stud welding station, 3-front floor connected to the inner panel spot welding station, 301-spot welding handling robot, 302-second servo turntable, 303-first automatic glue extrusion system, 4-front floor connected to the inner panel FDS point positioning station, 401-first FDS robot, 5-front floor connected to the inner panel FDS repair welding station, 501-second FDS robot, 6-front floor connected to the outer panel FDS station, 601-third FDS robot, 602-third servo turntable, 7-assembly spot welding Workstation, 701-the third spot welding handling robot, 8-assembly spot welding and repair welding station, 801-eight-axis spot welding handling robot, 802-the fourth servo turntable, 803-the first fixed spot welding clamp, 9-product measurement and inspection station, 901-visual measurement robot, 902-product offline slide, 10-AGV trolley, 11-transfer handling robot, 1101-the second fixed spot welding clamp, 12-seven-axis handling robot, 1201-the first product online slide, 1202-manual riveting station, 1203-the second automatic glue extrusion system, 13-the second seven-axis handling robot, 1301-the second product online slide, 1302-the third automatic glue extrusion system, 1303-manual stud welding station. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0036] like Figure 1-4 The present invention provides a technical solution: an automatic production line for the front longitudinal beam of a steel-aluminum hybrid automobile body, comprising

[0037] The longitudinal beam body MIG welding station 2, which is connected to the front floor inner panel FDS point positioning station 4, transfers the longitudinal beam body parts semi-finished products through the AGV car 10, including the laser coding equipment 201 for coding the longitudinal beam body workpiece and the scanning equipment 202 for scanning and recording the code;

[0038] The front floor panel spot welding station 3 is used to transfer workpieces to the front floor panel FDS spot welding station 4 via a transfer robot 11. The station includes a spot welding transfer robot 301, a first automatic glue extrusion system 303, and a second servo turntable 302 for manual pick-up and placement of parts and spot welding operations.

[0039] The front floor inner panel FDS point-fixing station 4 and the front floor inner panel FDS repair welding station 5 are transferred by a first seven-axis handling robot 12, including the left front longitudinal beam, the right front longitudinal beam, and two sets of welding fixtures. The working area of ​​the first seven-axis handling robot 12 is equipped with a manual riveting station 1202 and three sets of loading slides 1201;

[0040] The front floor is connected to the inner panel FDS repair welding station 5, which is connected to the front floor outer panel FDS station 6 through the second seven-axis handling robot 13 for workpiece transfer, including a second FDS robot 501 and two sets of welding fixtures for FDS repair welding operations;

[0041] The front floor is connected to the outer panel FDS station 6, which is connected to the assembly spot welding station 7 by the third spot welding transfer robot 701, including two third FDS robots 601 and a third servo turntable 602;

[0042] The assembly spot welding station 7, which, together with the assembly spot welding and repair welding station 8 and the product measurement and inspection station 9, is transported by an eight-axis spot welding transfer robot 801, including a third spot welding transfer robot 701 for performing spot welding operations;

[0043] The assembly spot welding and repair welding station 8, which, together with the assembly spot welding station 7 and the product measurement and inspection station 9, transfers workpieces via an eight-axis spot welding handling robot 801, comprises the eight-axis spot welding handling robot 801, a fourth servo turntable 802, and a first fixed spot welding clamp 803. The fourth servo turntable 802 is equipped with a nut plate for connecting the front floor to the outer panel.

[0044] The product measurement and inspection station 9, which, together with the assembly spot welding station 7 and the assembly spot welding repair station 8, transfers workpieces through an eight-axis spot welding handling robot 801, includes a set of visual measurement robots 901, two sets of product offline slides 902, and two sets of visual measurement fixtures, wherein the visual measurement fixtures are fixedly installed on the ground. Example

[0045] like Figure 1The figure shows a schematic diagram of the structure of an automatic production line for front longitudinal beams of an automobile body according to the present embodiment. The automatic production line 1 for front longitudinal beams of an automobile body can produce two products, the left and right front longitudinal beam assemblies, on a mixed line. The front longitudinal beam assembly has many components and production processes. In order to improve production efficiency, the workstations of the automatic production line 1 for front longitudinal beams of an automobile body are arranged linearly. Each process unit is provided with two workstations, each equipped with a set of fixtures corresponding to the left and right assembly products, and the robot works alternately between the two workstations. Therefore, the automatic production line 1 for front longitudinal beams of an automobile body alternates the production of left and right front longitudinal beam assemblies. All the single-product loading and assembly product unloading stations of the automatic production line 1 for front longitudinal beams of an automobile body are located on the same side of the production line, including 3 manual loading stations, 5 robot loading stations, and 2 automatic product unloading stations.

[0046] The automated production line 1 for front longitudinal beams of automobile bodies, laid out from right to left, includes stations 2 for MIG welding of the main beam, 3 for spot welding of the front floor panel connecting to the inner panel, 4 for FDS spotting of the front floor panel connecting to the inner panel, 5 for FDS repair welding of the front floor panel connecting to the inner panel, 6 for FDS repair welding of the front floor panel connecting to the outer panel, 7 for assembly spot welding, 8 for assembly spot welding and repair welding, and 9 for product measurement and inspection. This system automatically completes various processes for the steel-aluminum hybrid front longitudinal beam, including aluminum alloy arc welding, sub-component steel spot welding, damping adhesive application, FDS connection of steel and aluminum materials, structural adhesive application, assembly steel spot welding, and visual measurement and inspection.

[0047] In this embodiment of the present invention, semi-finished longitudinal beam body parts are transported between the longitudinal beam body MIG welding station 2 and the front floor inner panel FDS spot welding station 4 via an AGV trolley 10. A transfer robot 11 is used to transport workpieces between the front floor inner panel spot welding station 3 and the front floor inner panel FDS spot welding station 4. A seven-axis transfer robot 12 is used to transport workpieces between the front floor inner panel FDS spot welding station 4 and the front floor inner panel FDS repair welding station 5. A seven-axis transfer robot 13 is used to transport workpieces between the front floor inner panel FDS repair welding station 5 and the front floor outer panel FDS station 6. A spot welding transfer robot 701 is used to transport workpieces between the front floor outer panel FDS station 6 and the assembly spot welding station 7. An eight-axis spot welding transfer robot 801 is used to transport workpieces between the assembly spot welding station 7, the assembly spot welding repair welding station 8, and the product measurement and inspection station 9. This eliminates the need for manual long-distance workpiece transport on the production line, further achieving the goal of increased automation.

[0048] In an embodiment of the present invention, the welding robot 204, the third spot welding handling robot 701 and the eight-axis spot welding handling robot 801 are all equipped with spot welding clamp integrated product grippers, which can not only complete spot welding operations but also grab workpieces for handling, gluing and repair welding, thereby further achieving the purpose of improving efficiency.

[0049] In this embodiment of the present invention, the first, second, and third servo turntables 203, 302, and 602 all feature two-station configurations capable of ±180° horizontal rotation. Workpiece loading and unloading, as well as robot operation, can occur simultaneously on both sides of the turntables, further improving efficiency. Each station is equipped with a guide and positioning mechanism and a rapid energy switching unit, enabling quick and easy replacement of fixtures for other vehicle models, further enhancing flexibility.

[0050] In the embodiment of the present invention, all the floor-standing clamps are installed on the quick-setting positioning mechanism, so as to facilitate the rapid replacement of clamps for other types of vehicles, thereby further achieving the purpose of improving flexibility.

[0051] In an embodiment of the present invention, the first automatic glue extrusion system 303, the second automatic glue extrusion system 1203 and the third automatic glue extrusion system 1302 are all equipped with servo quantitative mechanisms and real-time visual detection systems, which automatically alarm for quality defects occurring during the gluing process, avoiding the transmission of related problems to subsequent processes, and further achieving the purpose of improving automation and intelligence.

[0052] In the embodiment of the present invention, the workflow of the automatic production line for the steel-aluminum hybrid front longitudinal beam of the automobile body is as follows:

[0053] First, a laser coding device 201 manually codes the main part of the aluminum alloy front longitudinal beam. After scanning the code with a barcode scanner 202 to log in the product information, the part is manually installed on the fixture of the first servo turntable 203. After the welding robot 204 completes MIG welding, the workpiece is manually placed on the AGV 10, which transports it to the manual riveting station 1202. After the manual riveting is completed, the main longitudinal beam part and the cabin connection parts are installed on the first product launch slide 1201. The first seven-axis handling robot 12 then scans the workpiece with the barcode scanner 202 to confirm the information. Then, the second automatic glue extrusion system 1203 applies glue before the workpiece is installed on the fixture of the front floor inner panel FDS point-setting station 4.

[0054] Simultaneously with the above process, a new workpiece is manually mounted on the fixture of the second servo turntable 302 at the front floor panel spot welding station 3. Once the turntable is rotated into position, the spot welding handling robot 301 grabs the workpiece and performs repair welding with the second fixed spot welding clamp 1101. After the repair welding is complete, the workpiece is mounted on the fixture of the front floor panel FDS spot welding station 4, completing the automatic part loading process at this station. The first FDS robot 401 performs the FDS operation. After completion, the first seven-axis handling robot 12 grabs the workpiece and mounts it directly on the fixture of the front floor panel FDS repair welding station 5, where the second FDS robot 501 performs the FDS repair welding. After the second seven-axis handling robot 13 finishes grabbing the workpiece, it first cooperates with the third automatic glue extrusion system 1302 to apply glue, and then installs it on the fixture of the third servo turntable 602 of the front floor connecting outer panel FDS station 6, and then grabs the front floor connecting outer panel parts and cabin connecting small parts from the second product online slide 1301 and installs them on the fixture of the third servo turntable 602 to complete the automatic loading.

[0055] The stud welding process on the part is completed at manual stud welding station 1303. After the fixture of the third servo turntable 602 automatically loads the part, the turntable rotates into position, and two third FDS robots 601 perform FDS operations simultaneously. Subsequently, the third spot welding handling robot 701 grabs the workpiece and installs it on the fixture of the assembly spot welding station 7 to complete the spot welding. The eight-axis spot welding handling robot 801 grabs the workpiece after spot welding and first cooperates with the first fixed spot welding clamp 803 to repair welds in specific locations. It then installs the workpiece on the fixture of the fourth servo turntable 802 of the assembly spot welding repair station 8. Before the robot loads the part, the two small parts connecting the front floor inner panel have been manually installed. The spot welding at this station is completed by the eight-axis spot welding handling robot 801. After completion, the eight-axis spot welding handling robot 801 grabs and installs it on the fixture of the product measurement and inspection station 9. The visual measurement robot 901 performs photo measurement and inspection. Qualified products are lifted by the product off-line slide 902 and moved to the manual pickup position to complete the product off-line.

[0056] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simpler modifications, and these simple modifications all fall within the scope of protection of the present invention.

[0057] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not separately describe various possible combinations.

[0058] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An automatic production line for automobile body steel-aluminum hybrid front longitudinal beams, characterized in that: include The longitudinal beam body MIG welding station (2) is connected to the front floor inner plate FDS point fixing station (4) and transfers the longitudinal beam body parts semi-finished products through the AGV trolley (10), including a laser coding device (201) for coding the longitudinal beam body workpiece and a code scanning device (202) for scanning and recording the code; A front floor connecting inner panel spot welding station (3) is used to transfer workpieces with a front floor connecting inner panel FDS spot fixing station (4) via a transfer handling robot (11), comprising a first spot welding handling robot (301), a first automatic glue squeezing system (303), and a second servo turntable (302) for manually placing and picking parts and performing spot welding operations; A front floor connecting inner panel FDS point-fixing station (4) and a front floor connecting inner panel FDS repair welding station (5) are used to transfer workpieces via a first seven-axis handling robot (12), including a left front longitudinal beam, a right front longitudinal beam, and two sets of welding fixtures, wherein a manual riveting station (1202) and three sets of loading slides (1201) are provided in the working area of ​​the first seven-axis handling robot (12); The front floor is connected to the inner plate FDS repair welding station (5), which is connected to the front floor outer plate FDS station (6) through a second seven-axis handling robot (13) for workpiece transfer, including a second FDS robot (501) for performing FDS repair welding operations and two sets of welding fixtures; The front floor is connected to the outer panel FDS station (6), which is used to transfer workpieces with the assembly spot welding station (7) through a third spot welding handling robot (701), including two third FDS robots (601) and a third servo turntable (602); An assembly spot welding station (7), an assembly spot welding repair station (8), and a product measurement and inspection station (9) are used to transfer workpieces via an eight-axis spot welding handling robot (801), including a third spot welding handling robot (701) for performing spot welding operations; an assembly spot welding and repairing station (8), which, together with the assembly spot welding station (7) and the product measuring and inspection station (9), performs workpiece transfer via an eight-axis spot welding handling robot (801), comprising the eight-axis spot welding handling robot (801), a fourth servo turntable (802), and a first fixed spot welding clamp (803), wherein a front floor connecting outer plate nut plate is mounted on the fourth servo turntable (802); The product measurement and inspection station (9) is used to transfer workpieces with the assembly spot welding station (7) and the assembly spot welding repair station (8) through an eight-axis spot welding handling robot (801), and includes a set of visual measurement robots (901), two sets of product offline slides (902) and two sets of visual measurement fixtures, wherein the visual measurement fixtures are fixedly installed on the ground.

2. The automatic production line for automobile body steel-aluminum hybrid front longitudinal beams according to claim 1 is characterized in that: The fixtures at each workstation are equipped with guiding, positioning and fixing mechanisms for switching fixtures for other products, and each workstation is located on the same side of the production line.

3. The automatic production line for automobile body steel-aluminum hybrid front longitudinal beams according to claim 1 is characterized in that: The first automatic glue extrusion system, the second automatic glue extrusion system and the third automatic glue extrusion system are all provided with a servo quantitative mechanism and a real-time visual detection system for alarming quality defects generated during the glue coating process.

4. The automatic production line for automobile body steel-aluminum hybrid front longitudinal beams according to claim 3 is characterized in that: When the product measurement and inspection station is operating, the visual measurement robot automatically takes pictures and then the visual system measures key dimensions.

5. The automatic production line for automobile body steel-aluminum hybrid front longitudinal beams according to claim 1 is characterized in that: The laser coding equipment codes the product and scans the code at the longitudinal beam body MIG welding station, the first seven-axis handling robot and the longitudinal beam body part loading station.

6. The automatic production line for automobile body steel-aluminum hybrid front longitudinal beams according to claim 5, characterized in that: The automatic production line for the steel-aluminum hybrid front longitudinal beam of the automobile body is also provided with a data acquisition and management system for identifying product information based on the scanned code information and associating the data uploaded by the production equipment.

7. The automatic production line for automobile body steel-aluminum hybrid front longitudinal beams according to claim 1, characterized in that: The spot welding tongs held by the first spot welding transport robot, the third spot welding transport robot and the eight-axis spot welding transport robot are all equipped with part gripper mechanisms for grabbing the workpiece for transporting, gluing, spot welding and repair welding operations.

8. The automatic production line for automobile body steel-aluminum hybrid front longitudinal beams according to claim 7, characterized in that: The gripping mechanisms all adopt a polyhedron structure for being compatible with gripping a variety of parts and semi-finished workpieces.

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