Tool clamp for projection welding of automobile stamping parts

Abstract

The utility model relates to a work fixture for projection welding of automobile stamping parts in the technical field of work fixtures. The work fixture comprises a longitudinal sliding table capable of sliding front and back, a transverse sliding table capable of sliding left and right and a rotatable clamping mechanism. U-shaped notches are formed in the middles of the longitudinal sliding table and the transverse sliding table, and the lower welding head penetrates out of the middles of the notches; longitudinal guide rails are arranged on the left side and the right side of the lower welding head. The longitudinal sliding table is slidably connected with the two longitudinal guide rails through longitudinal sliding blocks. Transverse guide rails are arranged on the left side and the right side of the U-shaped notch. The transverse sliding table is slidably connected with the two transverse guide rails through transverse sliding blocks. Two sets of clamping mechanisms are arranged on the transverse sliding table on the left side and the right side of the U-shaped notch, each clamping mechanism comprises an upper jaw block and a lower jaw block which can be opened, closed and clenched, and the two lower jaw blocks are rotatably arranged above the transverse sliding table. According to the tool clamp, the work of welding parts at different positions on the automobile stamping part can be completed at a time only by clamping the workpiece, operation is easy and convenient, the working efficiency is improved, the workpiece is clamped firmly, and the precision is high.

Description

Technical Field

[0001] This utility model belongs to the field of tooling and fixture technology, specifically relating to a tooling and fixture for projection welding of automotive stamping parts. Background Technology

[0002] Projection welding machines are resistance welding machines capable of simultaneous multi-point welding. Compared to traditional MIG welding and TIG welding machines, they offer advantages in terms of environmental friendliness and efficiency. Projection welding machines are commonly used for spot welding components such as screws and nuts onto automotive stampings. Traditional projection welding operations rely on manual handling of the automotive stampings, placing them on the machine for positioning and welding. This is labor-intensive and prone to human error, leading to inaccurate welding positions. To reduce manual labor and improve workpiece positioning stability and accuracy, projection welding machine fixtures were designed. However, existing fixtures have relatively simple structures and functions. Once a workpiece is clamped onto the machine, it cannot be moved. When welding components at different locations on the same automotive stamping, the workpiece must be removed from the fixture for adjustment or even flipping before being clamped again, which is cumbersome and hinders efficiency. Therefore, there is an urgent need to improve and refine the tooling fixtures for projection welding machines. Utility Model Content

[0003] In response to the above situation, this utility model provides a tooling fixture for projection welding of automotive stamping parts. After the workpiece to be welded is clamped and positioned, the welding of parts at different positions on the automotive stamping parts can be completed in one go.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A tooling fixture for projection welding of automotive stamping parts includes a projection welding machine, a work platform disposed in the middle of the projection welding machine, and a press head disposed above the work platform. A vertically arranged lower welding head is installed on the work platform, a lifting telescopic rod is disposed above the press head, and an upper welding head is installed below the telescopic end of the lifting telescopic rod. The work platform is also provided with a fixture assembly for clamping the workpiece to be welded. The fixture assembly includes a longitudinal slide that can slide back and forth above the work platform, a transverse slide that can slide left and right above the longitudinal slide, and a clamping mechanism that can be rotatably installed above the transverse slide.

[0006] Both the longitudinal slide and the transverse slide have U-shaped notches in the middle, and the upper part of the lower welding head can be movably protruded from the middle of the two U-shaped notches.

[0007] Two longitudinal guide rails extending in the front-to-back direction are fixedly installed on the working platforms on the left and right sides of the lower welding head. The bottom of the longitudinal slide is slidably connected to the two longitudinal guide rails through a longitudinal slider. Two transverse guide rails extending in the left-to-right direction are fixedly installed above the longitudinal slides on the left and right sides of the U-shaped notch. The bottom of the transverse slide is slidably connected to the two transverse guide rails through a transverse slider.

[0008] Two clamping mechanisms are respectively provided on the transverse slides on the left and right sides of the U-shaped notch, which are used to clamp the left and right edges of the workpiece to be welded. Each clamping mechanism includes an upper jaw block and a lower jaw block that can be opened and closed and clamped. The upper jaw block is detachably connected to the upper part of the lower jaw block. The two lower jaw blocks are rotatably connected to the upper part of the transverse slide through a rotating shaft and bearing.

[0009] Furthermore, a follower rack extending in the front-to-back direction is fixedly installed on one side of the bottom of the longitudinal slide table, a drive motor is provided above the work platform, a drive gear is installed on the conveyor shaft of the drive motor, and the drive gear meshes with the follower rack.

[0010] Furthermore, a push-pull telescopic rod extending in the left-right direction is provided on one side of the transverse slide. The bottom outer wall of the push-pull telescopic rod is fixedly connected to the upper part of the longitudinal slide, and the telescopic end of the push-pull telescopic rod is connected to the transverse slide.

[0011] Furthermore, the upper jaw block and the lower jaw block are respectively provided with upper and lower biting lips for cooperating and biting the workpiece to be welded on the side close to the workpiece to be welded. The connection between the upper jaw block and the lower jaw block is a wedge-shaped surface that can slide and contact. A threaded hole is vertically opened on the lower jaw block, and a locking screw is screwed above the threaded hole. A T-shaped long through hole extending in the left and right direction is opened in the middle of the upper jaw block, and the upper part of the locking screw moves through the T-shaped long through hole.

[0012] Furthermore, the lower jaw block has a protruding connecting part fixed to one end away from the workpiece to be welded. The connecting part is connected to the rotating shaft by connecting screws. The two ends of the rotating shaft are rotatably mounted above the transverse slide table by two bearings, both of which are vertical spherical bearings with seats.

[0013] Furthermore, a rotating gear is fixedly installed on the outer side of the shaft between the two bearings, and a push-pull rack extending in the front-to-back direction is fixedly installed on the transverse slide. The top of the push-pull rack meshes with the rotating gear. By driving the rotating gear to rotate through the push-pull rack, the angle of the shaft and the workpiece to be welded can be flipped. The bottom of the push-pull rack is slidably mounted above the transverse slide through a grooved guide rail. One end of the push-pull rack is connected to the telescopic end of a drive telescopic rod, and the bottom of the drive telescopic rod is fixedly connected to the transverse slide.

[0014] Preferably, the lifting telescopic rod is a hydraulic cylinder used to drive the upper welding head to move up and down; the push-pull telescopic rod and the drive telescopic rod are both servo electric cylinders, the push-pull telescopic rod is used to drive the transverse slide to move left and right, and the drive telescopic rod is used to drive the rotating shaft and the workpiece to be welded to roll and flip; the drive motor is a servo motor used to realize the longitudinal slide to slide back and forth.

[0015] This utility model also includes other components that enable its normal use, all of which are conventional means in the field. In addition, devices or components not limited in this utility model, such as projection welding machine and its working platform, pressure head, upper welding head, lower welding head, etc., all adopt the prior art in the field.

[0016] The beneficial effects of this utility model are as follows:

[0017] This tooling fixture for projection welding of automotive stamping parts can complete the welding of different parts on automotive stamping parts in one go after the workpiece to be welded is clamped and positioned. It is simple and convenient to operate, which helps to improve the efficiency of welding work. Moreover, the workpiece is clamped and fixed very firmly, and the positioning accuracy of the welding position of the parts is also effectively improved. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the projection welding machine and tooling fixture in the embodiment;

[0019] Figure 2 for Figure 1 A schematic diagram of the tooling fixtures in section A;

[0020] Figure 3 for Figure 2 A schematic diagram of the follower rack and drive gear along the BB direction;

[0021] Figure 4 for Figure 2 A schematic diagram of the transverse and longitudinal slides along the CC direction;

[0022] Figure 5 for Figure 2 A schematic diagram of the push-pull rack and rotating gear along the DD direction. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0024] It should be noted that the terms "up," "down," "front," "back," "left," "right," "inner," and "outer," which indicate directions or positional relationships, are based on the attached drawings and are used only for ease of description.

[0025] Example

[0026] like Figure 1-5 As shown, a tooling fixture for projection welding of automotive stamping parts includes a projection welding machine 1, a working platform 2 disposed in the middle of the projection welding machine, and a press head 3 disposed above the working platform. A vertically arranged lower welding head 4 is installed on the working platform. A lifting telescopic rod 5 is disposed above the press head. An upper welding head 6 is installed below the telescopic end of the lifting telescopic rod. The working platform is also provided with a fixture assembly for clamping the workpiece 33 to be welded. The fixture assembly includes a longitudinal slide 7 that can slide back and forth above the working platform, a transverse slide 8 that can slide left and right above the longitudinal slide, and a clamping mechanism that can be rotatably installed above the transverse slide.

[0027] Both the longitudinal slide and the transverse slide have a U-shaped notch 9 in the middle, and the upper part of the lower welding head can be movably protruded from the middle of the two U-shaped notches.

[0028] Two longitudinal guide rails 10 extending in the front-to-back direction are fixedly installed on the working platforms on the left and right sides of the lower welding head. The bottom of the longitudinal slide is slidably connected to the two longitudinal guide rails through a longitudinal slider 11. Two transverse guide rails 12 extending in the left-to-right direction are fixedly installed above the longitudinal slides on the left and right sides of the U-shaped notch. The bottom of the transverse slide is slidably connected to the two transverse guide rails through a transverse slider 13.

[0029] Two clamping mechanisms are respectively provided on the transverse slides on the left and right sides of the U-shaped notch, for clamping the left and right edges of the workpiece to be welded. Each clamping mechanism includes an upper jaw block 14 and a lower jaw block 15 that can be opened and closed and clamped. The upper jaw block is detachably connected to the upper part of the lower jaw block. The two lower jaw blocks are rotatably connected to the upper part of the transverse slide through a rotating shaft 16 and a bearing 17.

[0030] A follower rack 18 extending in the front-to-back direction is fixedly installed on one side of the bottom of the longitudinal slide table. A drive motor 19 is provided above the work platform. A drive gear 20 is installed on the conveyor shaft of the drive motor. The drive gear meshes with the follower rack.

[0031] A push-pull telescopic rod 21 extending in the left-right direction is provided on one side of the transverse slide. The bottom outer wall of the push-pull telescopic rod is fixedly connected to the upper part of the longitudinal slide, and the telescopic end of the push-pull telescopic rod is connected to the transverse slide.

[0032] The upper and lower jaw blocks are respectively provided with upper biting lips 22 and lower biting lips 23 on the side near the workpiece to be welded, for engaging and clamping the workpiece. The connection between the upper and lower jaw blocks is a wedge-shaped surface 24 that can slide. The lower jaw block has a vertically threaded hole, and a locking screw 25 is screwed above the threaded hole. The upper jaw block has a T-shaped through hole 26 extending in the left-right direction in the middle. The upper part of the locking screw moves through the T-shaped through hole. The locking screw is an internal hexagon screw. The T-shaped through hole is a vertical through hole with a T-shaped countersunk groove at the top. The head of the locking screw is recessed into the T-shaped countersunk groove, and the lower end of the locking screw is screwed into the threaded hole. As the locking screws are gradually tightened, relative sliding will occur between the wedge-shaped surfaces of the upper jaw block and the lower jaw block. The upper jaw block will gradually slide down, and the locking screws will continue to be tightened until the upper and lower jaw lips engage and clamp the left and right edges of the workpiece to be welded. The workpiece to be welded can then be clamped.

[0033] The lower jaw block has a protruding connecting part 27 fixedly connected to one end away from the workpiece to be welded. The connecting part is connected to the rotating shaft by a connecting screw 28. The two ends of the rotating shaft are rotatably mounted above the transverse slide table by two bearings. The bearings are all vertical spherical bearings with seats.

[0034] A rotating gear 29 is fixedly installed on the outer side of the shaft between the two bearings. A push-pull rack 30 extending in the front-back direction is fixedly installed on the transverse slide. The top of the push-pull rack meshes with the rotating gear. By driving the rotating gear to rotate through the push-pull rack, the angle of the shaft and the workpiece to be welded can be flipped. The bottom of the push-pull rack is slidably mounted above the transverse slide through a grooved guide rail 31. One end of the push-pull rack is connected to the telescopic end of the drive telescopic rod 32. The bottom of the drive telescopic rod is fixedly connected to the transverse slide.

[0035] The lifting telescopic rod is a hydraulic cylinder used to drive the upper welding head to move up and down; the push-pull telescopic rod and the drive telescopic rod are both servo electric cylinders. The push-pull telescopic rod can achieve precise positioning of the horizontal slide table's left and right translation position, and the drive telescopic rod can precisely control the rotation angle of the rotating shaft and the workpiece to be welded; the drive motor is a servo motor, which drives the drive gear to rotate and then drives the follower rack to move back and forth, achieving precise positioning of the longitudinal slide table's sliding position in the front and back directions.

[0036] The technical solution of this utility model is not limited to the specific embodiments described above. Without departing from the scope and spirit of the described embodiments, many modifications and changes will be obvious to those skilled in the art. Any technical modifications made within the spirit and principles of this utility model shall fall within the protection scope of this utility model.

Claims

1. A tooling fixture for projection welding of an automobile stamping, comprising a projection welding machine, a work platform arranged in the middle of the projection welding machine, and a press head arranged above the work platform, wherein a lower welding head is arranged vertically on the work platform, a lifting telescopic rod is arranged above the press head, and an upper welding head is arranged at the lower end of the lifting telescopic rod. The work platform is further provided with a clamp assembly for clamping the workpiece to be welded, the clamp assembly comprising a longitudinal sliding table slidably arranged above the work platform in the front-rear direction and a transverse sliding table slidably arranged above the longitudinal sliding table in the left-right direction, and a clamping mechanism rotatably mounted above the transverse sliding table; U-shaped notches are formed in the middle of the longitudinal sliding table and the transverse sliding table, and the upper part of the lower welding head is movably inserted into the middle of the two U-shaped notches; two longitudinal rails extending in the front-rear direction are fixedly arranged on the work platform on the left and right sides of the lower welding head, and the bottom of the longitudinal sliding table is slidably connected with the two longitudinal rails through longitudinal sliding blocks; two transverse rails extending in the left-right direction are fixedly arranged above the longitudinal sliding table on the left and right sides of the U-shaped notch, and the bottom of the transverse sliding table is slidably connected with the two transverse rails through transverse sliding blocks; two sets of clamping mechanisms are arranged on the transverse sliding table on the left and right sides of the U-shaped notch, respectively, for clamping the left and right side edges of the workpiece to be welded, each set of the clamping mechanism comprising an upper jaw block and a lower jaw block which can be opened and closed to tightly clamp, the upper jaw block being detachably connected above the lower jaw block, and the two lower jaw blocks being rotatably connected above the transverse sliding table through shafts and bearings, respectively.

2. A tooling fixture for projection welding of an automotive stamping according to claim 1, characterized in that: The bottom side of the longitudinal sliding table is fixedly provided with a follow-up rack extending in the front-rear direction, and a driving motor is arranged above the work platform, a driving gear being mounted on the transmission shaft of the driving motor and engaged with the follow-up rack.

3. The tooling fixture of claim 1, wherein: One side of the transverse sliding table is provided with a push-pull telescopic rod extending in the left-right direction, the bottom outer wall of the push-pull telescopic rod being fixedly connected above the longitudinal sliding table, and the telescopic end of the push-pull telescopic rod being connected with the transverse sliding table.

4. The tooling fixture of claim 1, wherein: The side of the upper jaw block and the lower jaw block close to the workpiece to be welded is correspondingly provided with an upper clamping lip and a lower clamping lip for clamping the workpiece to be welded, the joint between the upper jaw block and the lower jaw block being a wedge surface in slidable contact, a threaded hole being vertically formed in the lower jaw block, a locking screw being screwed above the threaded hole, and a T-shaped long through hole extending in the left-right direction being formed in the middle of the upper jaw block, the upper part of the locking screw being movably inserted into the T-shaped long through hole.

5. A tooling fixture for projection welding of an automotive stamping according to claim 4, characterized in that: The end of the lower jaw block away from the workpiece to be welded is fixedly connected with a protruding connecting part, the connecting part being connected with the shaft through a connecting screw, both ends of the shaft being rotatably arranged above the transverse sliding table through two bearings, and the bearings being vertical outer spherical surface bearing with a seat.

6. A tooling fixture for projection welding of an automotive stamping according to claim 5, characterized in that: A rotating gear is fixedly arranged on the shaft between the two bearings, a push-pull rack extending in the front-rear direction is fixedly mounted on the transverse sliding table, the top of the push-pull rack is engaged with the rotating gear, the bottom of the push-pull rack is slidably arranged above the transverse sliding table through a groove-shaped guide rail, one end of the push-pull rack is connected with a driving telescopic rod, and the bottom of the driving telescopic rod is fixedly connected with the transverse sliding table.

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