Automobile workpiece welding fixture

Abstract

The invention discloses an automobile workpiece welding fixture which is used for welding and positioning an automobile body cross beam stamping part and a stamping sheet metal part. The device comprises a base, a stand column, a clamping and positioning mechanism, a mounting beam, a fixed frame, a rotating frame, a pressing frame, a lifting mechanism and a bracket. The stand columns are fixedly installed on the two sides of the base, the top ends of the stand columns are provided with the clamping and positioning mechanisms, and transverse and longitudinal double positioning of the vehicle body cross beam stamping part is achieved in a two-end positioning mode in cooperation with the positioning columns, the clamping frames and the buckling claws. A fixing frame is arranged on the mounting beam, a front side bearing beam and a clamping and positioning mechanism jointly support a workpiece, a top rotating frame is driven by a lever type overturning air cylinder to drive a pressing frame to be matched with a bracket, a stamping sheet metal part is clamped, a welding part is exposed, and electric resistance welding operation is facilitated. The clamp is accurate in positioning, stable in clamping, convenient and fast to operate, capable of protecting workpieces, suitable for batch production and capable of improving the welding precision and efficiency.

Description

Technical Field

[0001] This invention relates to the field of automotive parts processing technology, and in particular to a welding fixture for automotive workpieces. Background Technology

[0002] In the production of automotive parts, welding the body crossbeam stamped parts to the stamped sheet metal parts is one of the key processes, and the welding accuracy directly affects the structural strength and assembly precision of the car body. Currently, existing welding fixtures suffer from problems such as inaccurate positioning, poor clamping stability, and cumbersome operation. On the one hand, the positioning of the body crossbeam stamped parts often uses unidirectional clamping, which is prone to offset and leads to welding misalignment. On the other hand, the fitting and positioning of the stamped sheet metal parts and the body crossbeam stamped parts is inconvenient, and the workpiece surface is easily damaged during clamping. Furthermore, the unreasonable structural design of the fixtures results in low workpiece clamping efficiency, affecting production cycle time.

[0003] Furthermore, the existing fixture's drive mechanism design is inadequate, with poor coordination in the opening and closing of the clamping frame, the raising and lowering of the jaws, and the flipping of the rotating frame. This leads to jamming and inaccurate positioning, failing to meet the welding precision and efficiency requirements of mass production. Therefore, a welding fixture for automotive workpieces that offers precise positioning, stable clamping, convenient operation, and strong adaptability is needed to address the shortcomings of the existing technology. Summary of the Invention

[0004] To address the technical problems existing in the background art, the present invention proposes a welding fixture for automotive workpieces.

[0005] The present invention proposes a welding fixture for automotive workpieces, including a base, on the top of both sides of the base, vertical columns are fixedly mounted, and the top of the two sets of columns are equipped with a clamping and positioning mechanism.

[0006] A horizontally arranged mounting beam is fixedly connected between the two sets of columns; a fixed frame is fixedly mounted on the mounting beam, and multiple sets of bearing beams are fixedly mounted on the front side of the fixed frame. Multiple sets of rotating frames are rotatably connected to the top of the fixed frame through a rotating shaft. The rotation of the rotating frame is achieved by a lever-type rotating cylinder. Horizontal frames are fixedly connected to both sides of the top of the rotating frame, and a downward pressure frame is fixedly connected to the free end of each set of horizontal frames.

[0007] The base has a fixed lifting mechanism in the middle, and a lifting beam is fixed at the top of the lifting mechanism. Multiple sets of support rods are vertically fixed to the top of the lifting beam, and each set of support rods is equipped with a bracket at the top. The number of each set of brackets is equal to the number of each set of lower pressure frames and they are arranged in a one-to-one correspondence. The load-bearing beam is used to support the vehicle body crossbeam stamping parts, and the bracket is used to support the stamped sheet metal parts.

[0008] Preferably, the clamping and positioning mechanism includes a mounting plate, a bearing plate on the upper part of the mounting plate, and a positioning post vertically connected to the top of the bearing plate; clamping frames are rotatably connected to both sides of the mounting plate via rotating shafts, and the opening and closing of the clamping frames are controlled by a pneumatic drive assembly, which includes a cylinder and a connecting rod. The cylinder body is hinged to the mounting plate, and the piston rod of the cylinder is hinged to the clamping frame. The extension and retraction of the cylinder piston rod drives the clamping frame to rotate around the rotating shaft, thereby achieving lateral clamping and positioning of the vehicle body crossbeam stamping part.

[0009] Preferably, the inner walls of both sets of clamping frames are vertically slidably connected with latches. The lifting and lowering of the latches is driven by a vertically arranged pneumatic telescopic cylinder. The pneumatic telescopic cylinder is fixedly mounted on the top of the clamping frame, and its piston rod is fixedly connected to the latches. The lifting and lowering of the latches is driven by the extension and retraction of the piston rod of the pneumatic telescopic cylinder, so that the latches cooperate with the bearing plate to realize the longitudinal clamping and positioning of the vehicle body crossbeam stamping part.

[0010] Preferably, the load-bearing beam and the two sets of load-bearing plates are located on the same horizontal plane, jointly supporting the vehicle body crossbeam stamping.

[0011] Preferably, the lifting mechanism is used to drive the bracket to lift the stamped sheet metal part upward, so that the stamped sheet metal part abuts against the lower side of the vehicle body crossbeam stamped part. The rotating frame can drive the crossbeam and the lower pressing frame to rotate, so that the lower pressing frame and the bracket cooperate to clamp and position the stamped sheet metal part.

[0012] Preferably, both ends of the vehicle body crossbeam stamping part are provided with through holes, which are used to be fitted onto the positioning post for positioning.

[0013] Preferably, a bracket is installed between the bottom of the mounting beam and the fixing frame.

[0014] Preferably, the lower side of the lower press frame is provided with an elastic pressure block or a wear-resistant positioning block for flexible contact and positioning with the stamped sheet metal part.

[0015] Preferably, the lower end face of the claw is provided with anti-slip embossing or a soft pad to improve clamping stability.

[0016] The anti-slip texture or soft pad on the lower end face of the clamping claw can improve clamping stability and prevent the stamped body beam from sliding; the elastic pressure block or wear-resistant positioning block on the lower side of the lower pressure frame can achieve flexible contact with the stamped sheet metal parts, avoid damage to the workpiece surface during clamping, ensure workpiece processing quality, and at the same time ensure firm clamping to prevent the workpiece from loosening during welding and affecting welding accuracy.

[0017] The automotive workpiece welding fixture proposed in this invention has the following beneficial effects:

[0018] The positioning is precise and reliable, and the positioning method is adapted to welding requirements. It adopts a two-end positioning method to position the body crossbeam stamping parts. Through the positioning columns, clamping frames and claws of two sets of clamping and positioning mechanisms, the body crossbeam stamping parts are positioned in both the lateral and longitudinal directions from both ends. This effectively avoids the displacement of the body crossbeam stamping parts during the welding process, ensuring the precise positioning of the body crossbeam stamping parts and providing a guarantee for the welding accuracy of subsequent stamped sheet metal parts and body crossbeam stamping parts. At the same time, the load-bearing beam and the load-bearing plate are located on the same horizontal plane, providing comprehensive support for the body crossbeam stamping parts, further improving positioning stability and avoiding uneven stress deformation of the body crossbeam stamping parts that may affect the welding quality.

[0019] The clamping mechanism is designed to facilitate welding operations. Through the cooperation of multiple rotating frames and corresponding pressing frames and brackets, each stamped sheet metal part is clamped and positioned synchronously. During the clamping process, the fit between the stamped sheet metal parts and the body beam stamped parts can be precisely controlled. At the same time, the welding parts of each stamped sheet metal part and the body beam stamped parts can be cleverly exposed, avoiding the clamping structure from obstructing the welding area. This provides sufficient space for the resistance welding mechanism to extend and weld, making it easier for the resistance welding mechanism to complete welding operations efficiently and accurately, reducing the difficulty of welding operations, and reducing problems such as welding misalignment and missed welds.

[0020] The rotating frame is driven by a lever-type rotating cylinder. The opening and closing of the clamping frame and the lifting and lowering of the claws are all pneumatically driven, with fast response and good coordination. It can quickly complete the synchronous clamping and positioning of the body beam stamping parts and multiple stamped sheet metal parts. The lifting mechanism drives the bracket to lift the stamped sheet metal parts, and cooperates with the rotating frame to achieve downward positioning. The whole process is highly automated, effectively improving production efficiency and adapting to the synchronous welding requirements of multiple stamped sheet metal parts and body beam stamping parts in mass production.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the clamping and positioning mechanism in this invention;

[0024] Figure 3 This is a structural schematic diagram of the vehicle body crossbeam stamping part and the stamped sheet metal part in this invention;

[0025] The following are the labels in the diagram: 1. Base; 2. Column; 3. Clamping and positioning mechanism; 301. Mounting plate; 302. Clamping frame; 303. Claw; 304. Bearing plate; 305. Positioning column; 4. Mounting beam; 5. Fixing frame; 501. Bearing beam; 502. Bracket; 601. Rotating frame; 602. Cross frame; 603. Lower pressure frame; 7. Lifting mechanism; 701. Lifting beam; 702. Support rod; 703. Lower bracket; 8. Body cross beam stamping part; 9. Stamped sheet metal part. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] like Figures 1-3 The illustrated automotive workpiece welding fixture includes a base 1, which serves as the mounting foundation for the entire fixture. The base 1 is made of high-strength cast iron to ensure the overall stability and load-bearing capacity of the fixture. Vertical columns 2 are bolted to the top of both sides of the base 1. The two sets of columns 2 are symmetrically arranged, and clamping and positioning mechanisms 3 are bolted to the top of each column for positioning and clamping both ends of the vehicle body crossbeam stamping part 8.

[0028] Two sets of uprights 2 are connected by a horizontally arranged mounting beam 4 by welding. The mounting beam 4 is made of rectangular steel pipe and has high structural strength. A fixing frame 5 is fixed to the mounting beam 4 by bolts. To improve the installation stability of the fixing frame 5, a bracket 502 is welded between the bottom of the mounting beam 4 and the fixing frame 5. The bracket 502 adopts a triangular support structure to further enhance the overall structural strength of the fixture. Multiple sets of load-bearing beams 501 are fixed to the front side of the fixing frame 5 by bolts. The load-bearing beams 501 are evenly distributed along the length of the fixing frame 5 and are used to support the vehicle body crossbeam stamping part 8.

[0029] The top of the fixed frame 5 is rotatably connected to multiple sets of rotating frames 601 via a rotating shaft. The number of rotating frames 601 matches the number of supporting beams 501. The rotation of the rotating frames 601 is achieved by a lever-type rotating cylinder. The cylinder body of the lever-type rotating cylinder is fixed to the side of the fixed frame 5, and its output end is connected to the rotating frame 601. Through the extension and retraction of the lever-type rotating cylinder, the rotating frame 601 is driven to rotate around the rotating shaft. Horizontal frames 602 are welded to both sides of the top of the rotating frame 601. The free end of each set of horizontal frames 602 is bolted to a lower pressure frame 603. The lower pressure frame 603 is set in a one-to-one correspondence with the bracket 703.

[0030] The middle part of the base 1 is fixed with a lifting mechanism 7 by bolts. The lifting mechanism 7 can be a lifting cylinder. The top of the lifting mechanism 7 is fixed with a lifting beam 701 by bolts. Multiple sets of support rods 702 are vertically welded to the top of the lifting beam 701. Each set of support rods 702 is equipped with a bracket 703 by bolts at the top. The number of each set of brackets 703 is equal to the number of each set of lower pressure frames 603 and they are set one-to-one. The brackets 703 are used to support the stamped sheet metal parts 9. The lower pressure frames 603 are used to cooperate with the brackets 703 to clamp and position the stamped sheet metal parts 9.

[0031] The clamping and positioning mechanism 3 includes a mounting plate 301, which is fixed to the top of the column 2 by bolts. The upper part of the mounting plate 301 is integrally formed with a bearing plate 304. A positioning post 305 is vertically welded to the top of the bearing plate 304. The diameter of the positioning post 305 is adapted to the through holes at both ends of the body crossbeam stamping part 8. Both ends of the body crossbeam stamping part 8 are provided with through holes, which are fitted onto the positioning post 305 to achieve the initial positioning of the body crossbeam stamping part 8.

[0032] The mounting plate 301 is rotatably connected to the two sides of the clamping frame 302 via a rotating shaft. The opening and closing of the clamping frame 302 is controlled by a pneumatic drive assembly, which includes a cylinder and a connecting rod. The cylinder body is hinged to the mounting plate 301 via a hinge seat, and the piston rod of the cylinder is hinged to the clamping frame 302 via a hinge pin. By extending and retracting the piston rod of the cylinder, the clamping frame 302 is driven to rotate around the rotating shaft, thereby achieving lateral clamping and positioning of the body crossbeam stamping part 8 and ensuring that the body crossbeam stamping part 8 does not shift in the lateral direction.

[0033] Both sets of clamping frames 302 have vertically slidingly connected claws 303 on their inner walls. The lifting and lowering of the claws 303 is driven by a vertically arranged pneumatic telescopic cylinder. The pneumatic telescopic cylinder is fixed to the top of the clamping frame 302 by bolts, and its piston rod is fixed to the claws 303 by bolts. By extending and retracting the piston rod of the pneumatic telescopic cylinder, the claws 303 are driven to lift and lower, so that the claws 303 cooperate with the bearing plate 304 to achieve longitudinal clamping and positioning of the body crossbeam stamping part 8, further improving the positioning stability of the body crossbeam stamping part 8.

[0034] To ensure the stability of the body crossbeam stamping 8, the load-bearing beam 501 and the two sets of load-bearing plates 304 are located on the same horizontal plane, jointly supporting the body crossbeam stamping 8 and preventing the body crossbeam stamping 8 from deforming due to uneven stress.

[0035] To protect the workpiece surface from damage, the lower pressure frame 603 is equipped with an elastic pressure block or a wear-resistant positioning block by bolts on its lower side. The elastic pressure block can be made of rubber, and the wear-resistant positioning block can be made of polyurethane, to achieve flexible contact with the stamped sheet metal part 9 and improve clamping stability. The lower end face of the claw 303 is provided with anti-slip texture or soft pressure pad. The anti-slip texture can increase the friction between the claw 303 and the body beam stamped part 8, and the soft pressure pad can be made of silicone to prevent damage to the surface of the body beam stamped part 8 during clamping and further improve clamping stability.

[0036] In this embodiment, during operation:

[0037] 1. Workpiece loading: The two end through holes of the body crossbeam stamping part 8 are respectively fitted onto the positioning pins 305 of the two sets of clamping and positioning mechanisms 3, so that the bottom of the body crossbeam stamping part 8 rests on the bearing plate 304 and the bearing beam 501. The bearing plate 304 and the bearing beam 501 together support the body crossbeam stamping part 8; the stamped sheet metal parts 9 are placed on each set of brackets 703 respectively.

[0038] 2. Positioning and clamping of the body crossbeam stamping 8: Activate the cylinder of the pneumatic drive assembly. The piston rod of the cylinder extends and drives the clamping frame 302 to rotate around the pivot through the connecting rod. The two sets of clamping frames 302 move closer to each other and clamp the body crossbeam stamping 8 laterally from both sides. Then activate the pneumatic telescopic cylinder. The piston rod of the pneumatic telescopic cylinder extends and drives the latch 303 to move downward. The latch 303 cooperates with the bearing plate 304 to clamp the body crossbeam stamping 8 longitudinally, completing the positioning and clamping of the body crossbeam stamping 8.

[0039] 3. Positioning and clamping of stamped sheet metal part 9: Start the lifting mechanism 7, the piston rod of the lifting mechanism 7 extends, driving the lifting beam 701, support rod 702 and bracket 703 to move upward. The bracket 703 drives the stamped sheet metal part 9 to be lifted upward, so that the stamped sheet metal part 9 abuts against the lower side of the body crossbeam stamped part 8; then start the lever-type tilting cylinder, the lever-type tilting cylinder drives the rotating frame 601 to rotate around the rotating shaft. The rotating frame 601 drives the cross frame 602 and the lower pressure frame 603 to rotate downward. The lower pressure frame 603 cooperates with the bracket 703 to clamp and position the stamped sheet metal part 9.

[0040] 4. Welding operation: After all workpieces are positioned and clamped, start the resistance welding equipment to perform welding operation on the connection between the body beam stamping part 8 and the stamped sheet metal part 9.

[0041] 5. Workpiece Removal: After welding is completed, control the lever-type tilting cylinder, lifting mechanism 7, pneumatic telescopic cylinder and cylinder reset in sequence to release the clamping of the workpiece, remove the welded workpiece, and complete one welding operation.

[0042] The automotive workpiece welding fixture of the present invention is accurate in positioning, stable in clamping, and convenient in operation. It can effectively improve welding accuracy and production efficiency, protect the workpiece surface from damage, adapt to the needs of mass production, and solve many defects in the prior art.

[0043] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A welding fixture for automotive workpieces, characterized in that, Includes a base (1), with vertical columns (2) fixedly mounted on the top of both sides of the base (1), and clamping and positioning mechanisms (3) assembled at the top of the two sets of columns (2). A horizontally arranged mounting beam (4) is fixedly connected between the two sets of columns (2); a fixed frame (5) is fixedly mounted on the mounting beam (4), and multiple sets of bearing beams (501) are fixedly mounted on the front side of the fixed frame (5). Multiple sets of rotating frames (601) are rotatably connected to the top of the fixed frame (5) through a rotating shaft. The rotation of the rotating frame (601) is achieved by a lever-type rotating cylinder. A cross frame (602) is fixedly connected to both sides of the top of the rotating frame (601), and a lower pressure frame (603) is fixedly connected to the free end of each set of cross frames (602). The base (1) is fixedly equipped with a lifting mechanism (7) in the middle, and a lifting beam (701) is fixedly equipped at the top of the lifting mechanism (7). The top of the lifting beam (701) is vertically connected to multiple sets of support rods (702), and each set of support rods (702) is equipped with a bracket (703) at the top. The number of each set of brackets (703) is equal to that of each set of lower pressure brackets (603) and they are set in a one-to-one correspondence. The bearing beam (501) is used to support the vehicle body crossbeam stamping part (8), and the bracket (703) is used to support the stamped sheet metal part (9).

2. The automotive workpiece welding fixture according to claim 1, characterized in that, The clamping and positioning mechanism (3) includes a mounting plate (301), a bearing plate (304) is provided on the upper part of the mounting plate (301), and a positioning column (305) is vertically connected to the top of the bearing plate (304); the two sides of the mounting plate (301) are rotatably connected to a clamping frame (302) through a rotating shaft. The opening and closing of the clamping frame (302) is controlled by a pneumatic drive assembly. The pneumatic drive assembly includes a cylinder and a connecting rod. The cylinder body is hinged to the mounting plate (301), and the piston rod of the cylinder is hinged to the clamping frame (302). The clamping frame (302) is driven to rotate around the rotating shaft by the extension and retraction of the piston rod of the cylinder, thereby realizing the lateral clamping and positioning of the body beam stamping part (8).

3. The automotive workpiece welding fixture according to claim 1, characterized in that, Both sets of clamping frames (302) have vertically slidingly connected claws (303) on their inner walls. The lifting and lowering of the claws (303) is driven by a vertically arranged pneumatic telescopic cylinder. The pneumatic telescopic cylinder is fixedly mounted on the top of the clamping frame (302), and its piston rod is fixedly connected to the claws (303). The lifting and lowering of the claws (303) is driven by the extension and retraction of the piston rod of the pneumatic telescopic cylinder, so that the claws (303) cooperate with the bearing plate (304) to realize the longitudinal clamping and positioning of the vehicle body crossbeam stamping part (8).

4. The automotive workpiece welding fixture according to claim 1, characterized in that, The load-bearing beam (501) and the two sets of load-bearing plates (304) are located on the same horizontal plane and jointly support the vehicle body crossbeam stamping (8).

5. The automotive workpiece welding fixture according to claim 1, characterized in that, The lifting mechanism (7) is used to drive the bracket (703) to lift the stamped sheet metal part (9) upward, so that the stamped sheet metal part (9) rests against the lower side of the body crossbeam stamped part (8). The rotating frame (601) can drive the cross frame (602) and the lower pressing frame (603) to rotate, so that the lower pressing frame (603) and the bracket (703) cooperate to clamp and position the stamped sheet metal part (9).

6. The automotive workpiece welding fixture according to claim 2, characterized in that, Both ends of the vehicle body crossbeam stamping part (8) are provided with through holes, which are used to be fitted onto the positioning post (305) for positioning.

7. The automotive workpiece welding fixture according to claim 1, characterized in that, A bracket (502) is installed between the bottom of the mounting beam (4) and the fixing frame (5).

8. The automotive workpiece welding fixture according to claim 1, characterized in that, The lower side of the pressure frame (603) is provided with an elastic pressure block or a wear-resistant positioning block for flexible contact and positioning with the stamped sheet metal part (9).

9. The automotive workpiece welding fixture according to claim 3, characterized in that, The lower end face of the latch (303) is provided with anti-slip embossing or soft padding to improve clamping stability.

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