Welding device and welding method for automobile chassis swing arm assembly

Abstract

The invention relates to the technical field of welding part supports, and discloses a welding device and method for an automobile chassis swing arm assembly.The welding device comprises a tool frame, a mounting part arranged on the tool frame and used for mounting a positioning tool, a positioning part mounted on the mounting part and used for automatically positioning a welding position and rapidly feeding and discharging, and a self-clamping part, the welding tool is installed on one side of the tool frame and used for automatically clamping and positioning the welding tool, the magnetic deflection blowing resisting part is installed at the bottom of the tool frame and used for real-time magnetic field detection according to the dynamic magnetic field compensation system principle, and four fluxgate sensors are symmetrically arranged on the top of the tool frame and can synchronously collect three-dimensional magnetic field data of a welding area; real-time capture of high-frequency magnetic field fluctuation is ensured, the control system calculates the excitation current of the electromagnets through a formula based on detection data, for example, when the detection magnetic field of a certain point is + 0.5 G, the corresponding electromagnet generates a-0.5 G magnetic field, and local magnetic field vector offset is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of welded component brackets, in particular to a welding device and a welding method for an automobile chassis swing arm assembly. Background Art

[0002] In the field of automobile manufacturing, the chassis is a key component, and its performance is directly related to the safety, handling stability and driving comfort of the whole vehicle. As one of the core components of the chassis system, the chassis swing arm is responsible for important functions such as transmitting force and torque and maintaining the correct positioning of the wheels, and has extremely high requirements for its manufacturing precision and quality. At present, automobile chassis swing arms are usually made of ferromagnetic materials such as carbon steel and alloy steel. These materials can meet the use requirements of swing arms under complex working conditions with their excellent strength and toughness.

[0003] According to the Chinese patent publication number CN119175510A, the patent provides a welding device for a lower arm assembly of an automobile, including a device body, support legs fixedly installed at the four corners of the bottom of the device body, a workbench is arranged at the center of the top of the device body, two limit plates are arranged on the top of the device body, and the two limit plates are located on the periphery of the workbench, electric hydraulic slides are arranged on the left and right sides of the top of the device body, and a welding component is arranged inside the electric hydraulic slide, and an outer wall of the telescopic end of the electric hydraulic slide close to the workbench is hinged with an inclined rod, an L-shaped plate is hinged at the bottom of the inclined rod, a vertical plate is hinged on the right side of the L-shaped plate, and an arc plate is hinged on the right side of the vertical plate, and a soft capsule is fixedly installed on the arc plate close to the center of the workbench. Through the cooperation of the L-shaped plate, the vertical plate, the arc plate and the soft capsule, the soft capsule can quickly clamp the irregular outer wall workpiece to ensure the welding stability of the workpiece and simplify the welding process.

[0004] As a key process in the manufacturing of automobile chassis swing arm assemblies, arc welding has been widely used in the industry due to its advantages of high efficiency, convenience, and moderate cost. However, when current passes through a swing arm made of ferromagnetic material, the magnetic domains inside the material will be oriented under the magnetic field generated by the external current, resulting in the swing arm being magnetized. This magnetism seriously interferes with the magnetic field distribution around the originally stable welding arc, and then causes magnetic blow, which poses a hidden danger to automobile driving safety. Therefore, a welding device and a welding method for an automobile chassis swing arm assembly are proposed to solve the above-mentioned problems. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies in the prior art, the present invention provides a welding device and a welding method for an automobile chassis swing arm assembly, which solves the problem that the internal magnetic domains of a swing arm made of ferromagnetic material will be oriented under the action of the magnetic field generated by an external current, resulting in the swing arm being magnetized and causing magnetic blow during welding.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a welding device for an automobile chassis swing arm assembly, comprising a tool frame, a mounting portion arranged on the tool frame for mounting a positioning tool, a positioning portion installed on the mounting portion for automatically positioning a welding position and quickly loading and unloading materials, a self-clamping portion installed on one side of the tool frame for automatically clamping and positioning the welding tool, and an anti-magnetic blow portion installed at the bottom of the tool frame for adaptively controlling and offsetting the magnetic field in the welding area and avoiding the magnetic blow phenomenon in welding.

[0009] Preferably, the anti-magnetic deflection part includes two slides, a slide frame is slidably connected between the two slides, two insulating plates are fixedly connected to the inner wall of the slide frame, two electromagnets are installed on each of the insulating plates, and ring 1 is fixedly connected to the four corners of the slide frame, four rings 2 are symmetrically installed on the bottom of the tooling frame, and each of the rings 2 is elastically connected to the adjacent ring 1 by a tension spring.

[0010] Preferably, the mounting portion includes four limit rods, and every two of the limit rods are respectively fixedly connected to one side of the inner wall of the tooling frame, a support arm is fixedly connected to the bottom of the tooling frame, an equipment table is fixedly connected to one corner of the outer wall of the tooling frame, and the bottom of the equipment table and the four corners of the bottom of the tooling frame are fixedly connected with mounting feet.

[0011] Preferably, the positioning portion includes a tooling mold, T-shaped arms are fixedly connected to both sides of the bottom of the tooling mold, four hinged blocks 1 are installed on one side of the tooling mold, a rocker arm 1 is hinged between every two adjacent hinged blocks 1, two rocker arms 2 are hinged on each rocker arm 1, and a rocker arm 3 is hinged at the ends of every two adjacent rocker arms 2, and four hinged blocks 2 are installed on the side wall of the support arm, and the ends of each rocker arm 3 are respectively hinged to its two adjacent hinged blocks 2.

[0012] Preferably, a gripping rod is fixedly connected between the two rocker arms 2 adjacent to each other, and each T-shaped arm is slidably connected between two limiting rods adjacent to itself.

[0013] Preferably, a swing arm welding part is installed on the tooling die, and a servo mechanical arm is installed on the equipment table.

[0014] Preferably, the self-clamping part includes two electric push rods, the two electric push rods are installed on one side of the top of the tooling frame, the inner rod ends of the two electric push rods are fixedly connected with push plates, two support plates 1 are installed on the top of the tooling frame, and infrared receiving ends are installed on the two support plates 1, and two hinge blocks 3 are installed on one side of the outer wall of the tooling frame, an adjustment block is hinged between the two hinge blocks 3, the top of the adjustment block is fixedly connected with a camera board, the camera board is a U-shaped structure, and the bottom of the two ear ends of the camera board are fixedly connected with clamping blocks.

[0015] Preferably, the end faces of the two push plates are both arc-shaped structures and fit with the bottom of the camera board through the arc-shaped surfaces, and one side of the tooling mold is clamped between the two clamping blocks and the inner wall of the tooling frame.

[0016] Preferably, four fluxgate sensors are symmetrically mounted on the top of the tooling frame, and each fluxgate sensor is electrically connected to an electromagnet adjacent to itself.

[0017] Preferably, the top ends of the two rocker arms three are fixedly connected to the support plate two, the tops of the two support plates two are installed with infrared emitting ends, the two infrared emitting ends are electrically connected to the two infrared receiving ends and are tilted, and the infrared emitting ends and the infrared receiving ends on the same side are aligned on the same axis.

[0018] A welding method of a welding device for an automobile chassis swing arm assembly, according to the welding device for an automobile chassis swing arm assembly, comprises the following steps:

[0019] Step 1: The swing arm welding part is installed on the matching tooling die, and the tooling die is pushed to slide on the limit rod to the welding position by adjusting the grip rod;

[0020] Step 2: The infrared transmitting end follows the rocker arm 3 and turns upward to align with the infrared receiving end. The electric push rod inner rod is driven to extend through the electrical signal, and the push plate pushes the camera plate to turn to the horizontal with the hinge end of the adjustment block as the axis, and the clamping block is prompted to automatically clamp the tooling mold on one side of the inner wall of the tooling frame to complete the welding positioning clamping;

[0021] Step 3: The servo robot calculates the weld position through single-point positioning and point combination and performs welding on the swing arm weldment. During the welding process, the arc current is distributed on the swing arm weldment. The fluxgate sensor performs magnetic field detection at four points respectively, and synchronously drives the corresponding electromagnet to generate a matching magnetic field strength according to the magnetic field strength at each point, thereby offsetting the magnetic field generated on the swing arm weldment, correcting the moving trajectory of the electromagnet on the tension spring, and thus ensuring the stability of the magnetic field in the welding area;

[0022] Step 4: After welding is completed, control the inner rod of the electric push rod to retract, so that the camera board is reset under the torsion of the torsion spring and is perpendicular to the tooling frame. The clamp block is away from the tooling mold to release the clamping limit. Pull the grip rod to cause the rocker arm 1, rocker arm 2, and rocker arm 3 to flip in a curve, driving the tooling mold to slide on the limit rod away from the welding position, which is convenient for material withdrawal and unloading.

[0023] (III) Beneficial effects

[0024] Compared with the prior art, the present invention provides a welding device and a welding method for an automobile chassis swing arm assembly, which have the following beneficial effects:

[0025] 1. The welding device and welding method used for the automobile chassis swing arm assembly adopt the principle of dynamic magnetic field compensation system for real-time magnetic field detection. Four fluxgate sensors are symmetrically arranged on the top of the tooling frame, which can synchronously collect three-dimensional magnetic field data in the welding area to ensure real-time capture of high-frequency magnetic field fluctuations. The control system calculates the electromagnet excitation current through a formula based on the detection data. For example, when the magnetic field detected at a certain point is +0.5G, the corresponding electromagnet generates a -0.5G magnetic field to achieve local magnetic field vector cancellation.

[0026] 2. The welding device and welding method for the automobile chassis swing arm assembly adopts a slide frame that is elastically connected to the tooling frame through a tension spring and can slide along the slide frame. When the external magnetic field changes and causes the slide frame to move, the spring force and the electromagnetic force are dynamically balanced to ensure that the compensation magnetic field always covers the welding area.

[0027] 3. The welding device and welding method used for the automobile chassis swing arm assembly adopt the infrared triggered flexible clamping principle for non-contact positioning detection. The infrared transmitting end at the top of the swing arm and the receiving end at the top of the tooling frame constitute a shooting system. When the transmitting end flips with the swing arm to align with the axis of the receiving end, the trigger signal causes the electric push rod to move. The U-shaped camera board realizes articulation angle compensation through the adjustment block. The clamping block adopts an arc contact design, which can adapt to the manufacturing error of the tooling mold and ensure reliable clamping of different batches of workpieces. Dual redundant safety logic is adopted. Only when the two infrared receiving ends receive the signal at the same time, the electric push rod is triggered to extend. The arc surface of the push plate fits with the bottom surface of the camera board to form a three-point support to ensure that the clamping force is evenly distributed and prevent the workpiece from deformation.

[0028] 4. The welding device and welding method for the automobile chassis swing arm assembly adopt the four-link linkage positioning principle to perform compound motion conversion. When the grip pushes the tooling mold to slide linearly along the limit rod, the first, second and third rocker arms form a four-link mechanism to convert the linear motion into a curved trajectory, so that the tooling mold can smoothly approach the welding position in a bionic motion manner. The sliding coordination between the T-arm and the limit rod, combined with the multi-axis rotation of the hinge block, realizes the positioning of the tooling mold in a two-dimensional plane.

[0029] 5. The welding device and welding method for the automobile chassis swing arm assembly adopt gravity-assisted material withdrawal. After welding is completed, when the grip rod is pulled in the opposite direction, the four-bar linkage is automatically reset under the action of gravity, driving the tooling mold to quickly withdraw along the limit rod, realizing tool-free disassembly and shortening the material withdrawal time.

[0030] 6. The welding device and welding method used for the automobile chassis swing arm assembly adopts a servo mechanical arm equipped with a visual sensor, obtains the three-dimensional point cloud data of the weld groove through laser triangulation, establishes a digital model, and cooperates with the multi-task collaborative control of the visual probe. The visual system and the magnetic field compensation system communicate in real time through industrial Ethernet. When the welding position deviation is detected, the electromagnet is synchronously triggered to dynamically adjust the compensation magnetic field to ensure that the arc is always aligned with the center of the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the overall structure of a welding device for an automobile chassis swing arm assembly proposed by the present invention;

[0032] Figure 2 This is an overall bottom axial view of a welding device for an automobile chassis swing arm assembly proposed by the present invention;

[0033] Figure 3 A connection diagram of a mounting portion and a self-clamping portion of a welding device for an automobile chassis swing arm assembly proposed by the present invention;

[0034] Figure 4 A connection diagram of a positioning part, a self-clamping part and a mounting part of a welding device for an automobile chassis swing arm assembly proposed by the present invention;

[0035] Figure 5 A structural schematic diagram of a positioning portion of a welding device for an automobile chassis swing arm assembly proposed by the present invention;

[0036] Figure 6 A schematic structural diagram of an anti-magnetic blow portion of a welding device for an automobile chassis swing arm assembly proposed by the present invention;

[0037] Figure 7 The present invention is a structural schematic diagram of a camera plate of a welding device for an automobile chassis swing arm assembly.

[0038] In the figure: 1. tooling frame; 2. installation part; 21. limit rod; 22. support arm; 23. equipment table; 24. installation foot; 3. positioning part; 31. tooling mold; 32. T-arm; 33. hinge block 1; 34. rocker arm 1; 35. rocker arm 2; 36. rocker arm 3; 37. hinge block 2; 38. grip rod; 4. swing arm welding part; 5. self-clamping part; 51. electric push rod; 52. push plate; 53. support plate 1; 54. infrared receiving end; 55. hinge block 3; 56. adjustment block; 57. camera board; 58. clamping block; 6. anti-magnetic deflection part; 61. slide; 62. slide frame; 63. insulation plate; 64. electromagnet; 65. collar 1; 66. collar 2; 67. tension spring; 7. fluxgate sensor; 8. support plate 2; 9. infrared transmitting end; 10. servo robot arm. DETAILED DESCRIPTION

[0039] 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.

[0040] See also Figure 1-7 The present invention provides a technical solution: a welding device for an automobile chassis swing arm assembly, comprising a tool frame 1, a mounting portion 2 arranged on the tool frame 1 for mounting a positioning tool, a positioning portion 3 mounted on the mounting portion 2 for automatically positioning a welding position and quickly loading and unloading materials, a self-clamping portion 5 mounted on one side of the tool frame 1 for automatically clamping and positioning the welding tool, and an anti-magnetic blow portion 6 mounted at the bottom of the tool frame 1 for adaptively controlling and offsetting the magnetic field in the welding area and avoiding the magnetic blow phenomenon in welding.

[0041] In this embodiment, the anti-magnetic deflection part 6 includes two slides 61, a slide frame 62 is slidably connected between the two slides 61, two insulating plates 63 are fixedly connected to the inner wall of the slide frame 62, two electromagnets 64 are installed on each insulating plate 63, and a ring 1 65 is fixedly connected to the four corners of the slide frame 62. Four rings 2 66 are symmetrically installed at the bottom of the tooling frame 1, and each ring 2 66 is elastically connected to the adjacent ring 1 65 with a tension spring 67. Four fluxgate sensors 7 are symmetrically installed on the top of the tooling frame 1. The fluxgate sensor 7 adopts the HMC1043 model and uses the orthogonal fluxgate technology to simultaneously measure three-dimensional magnetic field components to meet the high-precision detection requirements in complex magnetic field environments. Each fluxgate sensor 7 is electrically connected to the adjacent electromagnet 64.

[0042] It is worth noting that the mounting portion 2 includes four limit rods 21, and every two limit rods 21 are respectively fixedly connected to one side of the inner wall of the tooling frame 1, a support arm 22 is fixedly connected to the bottom of the tooling frame 1, and an equipment platform 23 is fixedly connected to one corner of the outer wall of the tooling frame 1, and the bottom of the equipment platform 23 and the four corners of the bottom of the tooling frame 1 are fixedly connected with mounting feet 24.

[0043] The positioning part 3 includes a tooling mold 31, and T-shaped arms 32 are fixedly connected to both sides of the bottom of the tooling mold 31. Four hinge blocks 33 are installed on one side of the tooling mold 31, and a rocker arm 34 is hinged between every two adjacent hinge blocks 33. Two rocker arms 2 35 are hinged on each rocker arm 1 34, and rocker arms 3 36 are hinged at the ends of every two adjacent rocker arms 2 35. Four hinge blocks 2 37 are installed on the side wall of the support arm 22, and the ends of each rocker arm 3 36 are respectively hinged to two hinge blocks 2 37 adjacent to itself, and a grip rod 38 is fixedly connected between two rocker arms 2 35 close to each other. Each T-shaped arm 32 is slidably connected between two limit rods 21 adjacent to itself.

[0044] It is worth noting that the self-clamping part 5 includes two electric push rods 51, which are installed on one side of the top of the tooling frame 1, and the inner rod ends of the two electric push rods 51 are fixedly connected with push plates 52. Two support plates 53 are installed on the top of the tooling frame 1. Infrared receiving ends 54 are installed on the two support plates 53. The infrared receiving ends 54 use infrared receiving pairs. Two hinge blocks 55 are installed on one side of the outer wall of the tooling frame 1. An adjustment block 56 is hinged between the two hinge blocks 55. A camera board 57 is fixedly connected to the top of the adjustment block 56. The camera board 57 is a U-shaped structure. A visual camera can be installed on the top of the camera board 57. The bottoms of the two ear ends of the camera board 57 are fixedly connected with clamping blocks 58. The end faces of the two push plates 52 are arc structures and fit with the bottom of the camera board 57 through the arc surface. The side is clamped between two clamping blocks 58 and the inner wall of the tooling frame 1. After the camera plate 57 is flipped to a horizontal position, the visual camera can take real-time pictures of the welding area from above to monitor the welding process. A swing arm welding part 4 is installed on the tooling mold 31, and a servo mechanical arm 10 is installed on the equipment table 23. The tops of the two swing arms 36 are fixedly connected to the support plates 28. The tops of the two support plates 28 are installed with infrared transmitting ends 9. The infrared transmitting ends 9 use infrared transmitting tubes IR333C. The two infrared transmitting ends 9 are electrically connected to the two infrared receiving ends 54 and are all tilted. The infrared transmitting ends 9 and the infrared receiving ends 54 on the same side are aligned on the same axis. The on-off state detection distance of the infrared counter-radiation signal is ≤50mm, which triggers the action logic of the electric push rod 51 to realize the non-contact transmission of the positioning signal.

[0045] A welding method for a welding device for an automobile chassis swing arm assembly, according to a welding device for an automobile chassis swing arm assembly, comprises the following steps:

[0046] Step 1: The swing arm welding part 4 is installed on the matching tooling die 31, and the tooling die 31 is pushed to slide on the limit rod 21 to the welding position by adjusting the gripping rod 38;

[0047] Step 2: The infrared transmitting end 9 follows the rocker arm 36 to flip upward and align with the infrared receiving end 54, and the inner rod of the electric push rod 51 is driven to extend through the electrical signal, and the push plate 52 pushes the camera plate 57 to flip to the horizontal with the hinge end of the adjustment block 56 as the axis, and prompts the clamping block 58 to automatically clamp the tooling mold 31 on one side of the inner wall of the tooling frame 1 to complete the welding positioning clamping;

[0048] Step 3: The servo robot 10 calculates the weld position through single-point positioning and point combination and performs welding operation on the swing arm weldment 4. The servo robot 10 is integrated with the visual positioning sensor Keyence CV-X200, which is based on the principle of laser triangulation, to perform three-dimensional modeling of the weld groove, and cooperates with the robot path planning algorithm to realize dynamic compensation of the welding trajectory. During the welding process, the arc current is distributed on the swing arm weldment 4, and the fluxgate sensor 7 performs magnetic field detection at four points respectively, and synchronously drives the corresponding electromagnet 64 to generate a matching magnetic field strength according to the magnetic field strength at each point, thereby offsetting the magnetic field generated on the swing arm weldment 4, and correcting the moving trajectory of the electromagnet 64 on the tension spring 67, thereby ensuring the stability of the magnetic field in the welding area;

[0049] Step 4: After welding is completed, the inner rod of the electric push rod 51 is controlled to retract, so that the camera board 57 is reset under the torsion of the torsion spring and is perpendicular to the tooling frame 1, and the clamping block 58 is away from the tooling mold 31 to release the clamping limit, and the gripping rod 38 is pulled to cause the rocker arm 1 34, the rocker arm 2 35, and the rocker arm 36 to flip in a curve and drive the tooling mold 31 to slide on the limit rod 21 away from the welding position, so as to facilitate the material withdrawal and unloading work.

[0050] Working principle: The tooling mold 31 is pushed to slide along the limit rod 21 by the grip rod 38, and the rough positioning is achieved by the sliding cooperation between the T-arm 32 and the limit rod 21. At this time, rocker arm 1 34, rocker arm 2 35, and rocker arm 3 36 form a four-bar linkage, which converts linear motion into curved motion to ensure smooth movement of the tooling mold 31.

[0051] When the tooling mold 31 reaches the welding position, the infrared emitting end 9 on the support plate 2 8 flips upward with the swing arm 3 36 and aligns with the infrared receiving end 54 on the top of the tooling frame. The infrared counter-radiation signal triggers the electric push rod 51 to move, and the push plate 52 pushes the camera plate 57 to rotate around the hinge axis of the adjustment block 56 to a horizontal state. The tooling mold 31 is clamped to the inner wall of the tooling frame 1 through the clamping block 58 at the bottom of the U-shaped camera plate 57. The servo robot arm 10 is equipped with a visual sensor to perform single-point positioning of the swing arm welding part 4, and the weld position is determined by calculating multiple sets of feature point coordinates to ensure the accuracy of the welding path.

[0052] Four fluxgate sensors 7 arranged symmetrically on the top of the tooling frame 1 collect magnetic field strength data of four key points in the welding area in real time. The control system synchronously adjusts the excitation current of the corresponding electromagnet 64 according to the detection value of each sensor. For example, when the magnetic field strength detection value of a certain point is B1, the formula Where L is the length of the magnetic path, N is the number of coil turns, and μ is the current required for calculating the magnetic permeability of the core, so that the electromagnet 64 generates a reverse magnetic field -B1 to achieve local magnetic field neutralization.

[0053] When the external magnetic field changes and causes the slide frame 62 to move, the elastic force of the tension spring 67 and the magnetic field force of the electromagnet 64 form a dynamic balance, and the slide frame 62 can slide along the slide 61 by ±5mm. By selecting the stiffness of the tension spring 67 k=50N / m to match the magnetic field force, it is ensured that the compensation magnetic field always covers the welding area.

[0054] After welding is completed, the electric push rod 51 contracts to drive the camera plate 57 to reset, the clamp block 58 releases the tooling die 31, and the gripping rod 38 is pulled in the reverse direction to drive the four-bar linkage, so that the tooling die 31 quickly withdraws from the welding area along the limiting rod 21, realizing tool-free disassembly.

[0055] In this case, a dynamic magnetic field compensation system, an adaptive control algorithm, and a PID control strategy are used. The detection value of the fluxgate sensor 7 is used as a feedback signal. The current of the electromagnet 64 is adjusted to 0-5A to achieve real-time magnetic field compensation. The system response time is <5ms, which can effectively suppress magnetic field fluctuations with a frequency of ≤200Hz.

[0056] Through the mechanical-electromagnetic coupling design, the sliding matching guide accuracy of the slide frame 62 and the slide 61 is ±0.1mm, combined with the elastic support of the tension spring 67, so that the compensation magnetic field can automatically adjust the effective area as the welding position changes, and the compensation range covers a circular area with a diameter of 300mm.

[0057] Through the flexible clamping positioning technology, the U-shaped camera plate 57 structure, and the hinged design of the adjustment block 56, the clamp block 58 can achieve ±15° angle compensation, adapting to the manufacturing error of the tooling mold 31 of ≤0.3mm. The infrared trigger logic adopts a dual-beam sensor redundant design. The clamping action is triggered only when the two infrared receiving ends 54 receive the signal at the same time, and the false trigger rate is <0.01%.

[0058] According to actual measurements, the device can reduce the welding magnetic blow angle from ±12° of the traditional process to ±3°, reduce the weld porosity from 0.8% to 0.2%, and increase the production cycle from 120 seconds / piece to 85 seconds / piece, significantly improving the swing arm welding quality and production efficiency.

[0059] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A welding device for an automobile chassis swing arm assembly, characterized in that: include: Tooling rack (1); A mounting portion (2), arranged on the tooling frame (1) and used for mounting a positioning tool; A positioning part (3) is mounted on the mounting part (2) and is used for automatically positioning the welding position and quickly loading and unloading materials; A self-clamping part (5) is installed on one side of the tooling frame (1) and automatically clamps the positioned welding tooling; An anti-magnetic blow unit (6) is installed at the bottom of the tooling frame (1) to adaptively control and offset the magnetic field in the welding area and avoid the magnetic blow phenomenon in welding; The anti-magnetic deflection part (6) includes two slides (61), a slide frame (62) is slidably connected between the two slides (61), two insulating plates (63) are fixedly connected to the inner wall of the slide frame (62), two electromagnets (64) are installed on each of the insulating plates (63), four corners of the slide frame (62) are fixedly connected to a ring 1 (65), four rings 2 (66) are symmetrically installed at the bottom of the tooling frame (1), and each of the rings 2 (66) is elastically connected to the adjacent ring 1 (65) by a tension spring (67).

2. The welding device for a swing arm assembly of an automobile chassis according to claim 1, characterized in that: The mounting portion (2) comprises four limiting rods (21), each two of the limiting rods (21) are respectively fixedly connected to one side of the inner wall of the tooling frame (1), the bottom of the tooling frame (1) is fixedly connected to a support arm (22), a corner of the outer wall of the tooling frame (1) is fixedly connected to an equipment platform (23), and the bottom of the equipment platform (23) and the four corners of the bottom of the tooling frame (1) are fixedly connected to mounting feet (24).

3. The welding device for a chassis swing arm assembly of an automobile according to claim 2, characterized in that: The positioning part (3) comprises a tooling mold (31), both sides of the bottom of the tooling mold (31) are fixedly connected with T-shaped arms (32), one side of the tooling mold (31) is equipped with four hinged blocks (33), a rocker arm (34) is hinged between every two adjacent hinged blocks (33), each rocker arm (34) is hinged with two rocker arms (35), and the ends of every two adjacent rocker arms (35) are hinged with a rocker arm (36), and the side wall of the support arm (22) is equipped with four hinged blocks (37), and the ends of each rocker arm (36) are respectively hinged with two adjacent hinged blocks (37).

4. The welding device for a chassis swing arm assembly of an automobile according to claim 3, characterized in that: A gripping rod (38) is fixedly connected between the two mutually adjacent rocker arms (35), and each of the T-shaped arms (32) is slidably connected between two limit rods (21) adjacent to itself.

5. The welding device for automobile chassis swing arm assembly according to claim 4, characterized in that: A swing arm welding part (4) is installed on the tooling die (31), and a servo mechanical arm (10) is installed on the equipment platform (23).

6. The welding device for a swing arm assembly of an automobile chassis according to claim 5, characterized in that: The self-clamping part (5) comprises two electric push rods (51), the two electric push rods (51) are mounted on one side of the top of the tooling frame (1), the inner rod ends of the two electric push rods (51) are fixedly connected with a push plate (52), the top of the tooling frame (1) is mounted with two support plates (53), the two support plates (53) are mounted with an infrared receiving end (54), the outer wall of the tooling frame (1) is mounted with two hinge blocks (55), an adjustment block (56) is hinged between the two hinge blocks (55), the top of the adjustment block (56) is fixedly connected with a camera board (57), the camera board (57) is a U-shaped structure, and the bottoms of the two ear ends of the camera board (57) are fixedly connected with clamping blocks (58).

7. The welding device for automobile chassis swing arm assembly according to claim 6, characterized in that: The end surfaces of the two push plates (52) are both arc-shaped structures and fit with the bottom of the camera plate (57) through the arc-shaped surfaces. One side of the tooling mold (31) is clamped between two clamping blocks (58) and the inner wall of the tooling frame (1).

8. The welding device for automobile chassis swing arm assembly according to claim 7, characterized in that: Four fluxgate sensors (7) are symmetrically mounted on the top of the tooling frame (1), and each fluxgate sensor (7) is electrically connected to an adjacent electromagnet (64).

9. The welding device for automobile chassis swing arm assembly according to claim 8, characterized in that: The top ends of the two rocker arms (36) are fixedly connected to the support plates (8), the tops of the two support plates (8) are installed with infrared emitting ends (9), the two infrared emitting ends (9) are electrically connected to the two infrared receiving ends (54) and are both inclined, and the infrared emitting ends (9) and the infrared receiving ends (54) on the same side are aligned on the same axis.

10. A welding method for a welding device for an automobile chassis swing arm assembly, according to the welding device for an automobile chassis swing arm assembly according to claim 9, characterized in that: The following steps are involved: Step 1: The swing arm welding part (4) is mounted on a matching tooling die (31), and the tooling die (31) is pushed to slide on the limit rod (21) to a welding position by adjusting the gripping rod (38); Step 2: The infrared transmitting end (9) follows the rocker arm 3 (36) to flip upward and align with the infrared receiving end (54), and the inner rod of the electric push rod (51) is driven to extend through an electrical signal, and the push plate (52) pushes the camera plate (57) to flip to a horizontal position with the hinge end of the adjustment block (56) as the axis, and prompts the clamping block (58) to automatically clamp the tooling mold (31) on one side of the inner wall of the tooling frame (1), completing the welding positioning clamping; Step 3: The servo robot arm (10) calculates the weld position through single-point positioning and point combination and performs welding operation on the swing arm welding part (4). During the welding process, the arc current is distributed on the swing arm welding part (4). The fluxgate sensor (7) performs magnetic field detection at four points respectively, and synchronously drives the corresponding electromagnet (64) to generate a matching magnetic field strength according to the magnetic field strength at each point, thereby offsetting the magnetic field generated on the swing arm welding part (4), correcting the moving trajectory of the electromagnet (64) on the tension spring (67), and thus ensuring the stability of the magnetic field in the welding area; Step 4: After welding is completed, the inner rod of the electric push rod (51) is controlled to retract, so that the camera plate (57) is reset under the torsion force of the torsion spring and is perpendicular to the tooling frame (1), the clamping block (58) is away from the tooling mold (31) to release the clamping limit, and the gripping rod (38) is pulled to cause the rocker arm 1 (34), the rocker arm 2 (35), and the rocker arm 3 (36) to turn over in a curve and drive the tooling mold (31) to slide on the limit rod (21) away from the welding position, so as to facilitate the material removal and unloading work.

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