A special arc welding fixture to prevent welding deformation

Abstract

This utility model provides a special arc welding fixture for preventing welding deformation, including a base mounting plate, a workpiece positioning device and a workpiece clamping device mounted on the base mounting plate. The workpiece positioning device includes a part mounting plate mounted on the base mounting plate, at least two positioning pins mounted on the part mounting plate, and multiple support blocks. The workpiece clamping device includes a cylinder seat mounted on the base mounting plate, a tilting cylinder mounted on the cylinder seat, a pressure arm mounted on the tilting cylinder, and a clamping block mounted below the pressure arm. By setting the positioning pins and support blocks on the part mounting plate, the workpiece can be placed on the support blocks, and the positioning pins can be inserted into the positioning holes of the workpiece. Then, the workpiece clamping device clamps the workpiece on both sides of the welding position, thereby effectively preventing the workpiece from deforming during welding.

Description

Technical Field

[0001] This utility model relates to the field of welding fixture technology, and in particular to a special arc welding fixture for preventing welding deformation. Background Technology

[0002] In the welding workstation's workflow, the welding fixture is securely mounted on the worktable, serving as a key device for accurately positioning and reliably securing the workpiece to be welded. Once the workpiece is precisely placed on the welding fixture, the welding robot executes the welding operation according to a preset program.

[0003] However, the workpieces handled by the current fixture are narrow, long, thin plates with a through-slot in the middle. During the welding process, a square tube needs to be welded to the middle of the workpiece. Since welding is a localized, rapid heating and cooling process, after the square tube is welded, the workpiece experiences uneven heating, resulting in a significant change in its internal stress distribution. This redistribution of internal stress leads to severe heat-induced deformation and bending of the workpiece, greatly affecting the welding quality and dimensional accuracy, and causing numerous adverse effects on subsequent machining, assembly, and workpiece performance. Utility Model Content

[0004] The purpose of this invention is to provide a special arc welding fixture to prevent welding deformation, thereby solving the technical problem of workpiece bending due to heat during welding, which affects the welding quality.

[0005] To solve the above-mentioned technical problems, this utility model provides a special arc welding fixture for preventing welding deformation, including a base mounting plate, a workpiece positioning device and a workpiece clamping device disposed on the base mounting plate. The workpiece positioning device includes a part mounting plate disposed on the base mounting plate, at least two positioning pins disposed on the part mounting plate, and multiple support blocks. The workpiece clamping device includes a cylinder seat disposed on the base mounting plate, a tilting cylinder disposed on the cylinder seat, a pressure arm disposed on the tilting cylinder, and a clamping block disposed below the pressure arm.

[0006] In the preferred embodiment, the two ends of the part mounting plate extend to the outside of the base mounting plate, and five support blocks are provided, one of which is located in the middle of the part mounting plate, and the other four are symmetrically distributed on both sides of the middle support block. There are two sets of workpiece clamping devices, and the clamping positions of the two sets of workpiece clamping devices are distributed on both sides of the middle support block.

[0007] In a preferred embodiment, a limiting block is provided above the cylinder seat, and a guide groove matching the pressure arm is provided above the limiting block.

[0008] In a preferred embodiment, grooves matching the through groove in the middle of the workpiece are provided on both sides of the lower end of the clamping block.

[0009] In a preferred embodiment, an adjusting shim for adjusting the height of the support block is provided below the base mounting plate, and the number of adjusting shims below the middle support block is less than the number of adjusting shims below the support blocks on both sides.

[0010] The beneficial effects of this invention are as follows: By setting positioning pins and support blocks on the part mounting plate, the workpiece can be placed on the support block, and the positioning pins can be inserted into the positioning holes of the workpiece. Then, the workpiece is clamped on both sides of the welding position using a workpiece clamping device, effectively preventing deformation of the workpiece during welding. Furthermore, by setting the part mounting plate, the workpiece can be pre-installed on the part mounting plate, and then the part mounting plate with the workpiece can be quickly installed onto the base mounting plate. This shortens the workpiece changeover time, thereby improving the welding efficiency of the welding robot. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a front view structural diagram of an embodiment of the present utility model; Figure 2 This is a side view of an embodiment of the present invention; Figure 3 This is a structural diagram of the guide groove according to an embodiment of the present invention; Figure 4 This is a structural diagram of the clamping block according to an embodiment of the present invention.

[0012] Reference numerals: 1. Base mounting plate; 2. Part mounting plate; 3. Tilting cylinder; 4. Clamping block; 41. Groove; 5. Support block; 6. Cylinder seat; 7. Adjusting shim; 8. Positioning pin; 9. Pressure arm; 10. Limiting block; 101. Guide groove. Detailed Implementation

[0013] In the description of this invention, it should be understood that if terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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 limiting this invention.

[0014] Example 1: Please see Figures 1-4As shown, the present application provides a technical solution: a special arc welding fixture for preventing welding deformation, including a base mounting plate 1, a workpiece positioning device and a workpiece clamping device disposed on the base mounting plate 1. The workpiece positioning device includes a part mounting plate 2 disposed on the base mounting plate 1, at least two positioning pins 8 disposed on the part mounting plate 2, and a plurality of support blocks 5. The workpiece clamping device includes a cylinder seat 6 disposed on the base mounting plate 1, a tilting cylinder 3 disposed on the cylinder seat 6, a pressure arm 9 disposed on the tilting cylinder 3, and a clamping block 4 disposed below the pressure arm 9.

[0015] Using the above structure, the workpiece can be placed on the support block 5, and the positioning pin 8 is inserted into the positioning hole of the workpiece, thus achieving workpiece positioning. In actual use, positioning pins are also set on the base mounting plate 1, and matching positioning cards are set on the part mounting plate 2, so that the part mounting plate 2 can be quickly positioned and installed on the base mounting plate 1. By setting the part mounting plate 2, the workpiece can be pre-positioned and installed on the part mounting plate 2 on the outside of the welding position, and then the part mounting plate 2 can be installed on the base mounting plate 1. The main reason for this setting is that the time to install the workpiece onto the part mounting plate 2 is much longer than the time to install the part mounting plate 2 onto the base mounting plate 1. By installing the workpiece onto the part mounting plate 2 first, only the part mounting plate 2 needs to be quickly switched during welding, which can improve the efficiency of robot welding.

[0016] In the preferred embodiment, the two ends of the part mounting plate 2 extend to the outside of the base mounting plate 1. Five support blocks 5 are provided, one of which is located in the middle of the part mounting plate 2, and the other four are symmetrically distributed on both sides of the middle support block 5. Two sets of workpiece clamping devices are provided, and the clamping positions of the two sets of workpiece clamping devices are distributed on both sides of the middle support block 5.

[0017] With the above structure, the part mounting plate 2 extends to the outside of the base mounting plate 1, which makes it convenient to grab and place the base mounting plate 1 from the extended part. The extended part of the part mounting plate 2 can serve as a point of force for grabbing the part mounting plate 2. At the same time, it ensures that the welding position of the workpiece should be above the middle support block 5. In this way, the supports on both sides of the workpiece can be arranged symmetrically, which can keep the deformation position of the workpiece consistent and facilitate the subsequent design of the structure to correct the workpiece deformation.

[0018] In a preferred embodiment, a limiting block 10 is provided above the cylinder seat 6, and a guide groove 101 matching the pressure arm 9 is provided above the limiting block 10.

[0019] With the above structure, the guide groove 101 can guide and limit the pressure arm 9, thereby ensuring that the position of the clamping block 4 will not change when it is clamped, thus preventing the workpiece from deforming during welding.

[0020] In a preferred embodiment, grooves 41 matching the through groove in the middle of the workpiece are provided on both sides of the lower end of the clamping block 4.

[0021] With the above structure, the grooves 41 on both sides can be locked onto the edge of the workpiece through groove, and the part of the groove 41 that is locked into the workpiece through groove can play a role in limiting the workpiece to the left and right.

[0022] Example 2: Further explanation in conjunction with Example 1; This embodiment is a further optimized design based on Embodiment 1. Repeated content will not be described here; only the differences from Embodiment 1 will be described. These differences are as follows: In a preferred embodiment, an adjusting shim 7 for adjusting the height of the support block 5 is provided below the base component mounting plate 21. The number of adjusting shims 7 below the middle support block 5 is less than the number of adjusting shims below the support blocks 5 on both sides.

[0023] Using the above structure, the adjusting shim 7 is a standard 1mm thick shim. The installation height of the support block 5 can be adjusted by setting the number of stacked adjusting shims 7. Since the clamping device cannot completely prevent the workpiece from deforming upwards during actual welding, we make the workpiece deform in the opposite direction to the welding deformation before welding. After welding, the superposition of workpiece deformations will return it to its normal size. Specifically, the installation height of the support block 5 is adjusted by setting adjusting shims 7 under the support block 5. Since the square tube is welded in the middle of the workpiece, the deformation in the middle of the workpiece is the greatest. At this time, we can set the installation position of the support block 5 in the middle to be the lowest. Thus, the number of adjusting shims 7 under the support block 5 in the middle position should be less than the number of shims under the support blocks 5 on both sides. The workpiece will deform downwards under its own weight and the action of the clamping device, so the workpiece will produce a deformation in the opposite direction to the deformation after welding.

[0024] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A special arc welding fixture for preventing welding deformation, characterized in that: The device includes a base mounting plate (1), a workpiece positioning device and a workpiece clamping device disposed on the base mounting plate (1). The workpiece positioning device includes a part mounting plate (2) disposed on the base mounting plate (1), at least two positioning pins (8) disposed on the part mounting plate (2), and multiple support blocks (5). The workpiece clamping device includes a cylinder seat (6) disposed on the base mounting plate (1), a tilting cylinder (3) disposed on the cylinder seat (6), a pressure arm (9) disposed on the tilting cylinder (3), and a clamping block (4) disposed below the pressure arm (9).

2. The special arc welding fixture for preventing welding deformation according to claim 1, characterized in that: The two ends of the part mounting plate (2) extend to the outside of the base mounting plate (1). There are five support blocks (5), one of which is located in the middle of the part mounting plate (2), and the other four are symmetrically distributed on both sides of the middle support block (5). There are two sets of workpiece clamping devices, and the clamping positions of the two sets of workpiece clamping devices are distributed on both sides of the middle support block (5).

3. A special arc welding fixture for preventing welding deformation according to claim 1, characterized in that: A limiting block (10) is provided above the cylinder seat (6), and a guide groove (101) matching the pressure arm (9) is provided above the limiting block (10).

4. A special arc welding fixture for preventing welding deformation according to claim 1, characterized in that: The clamping block (4) has grooves (41) on both sides of its lower end that match the through groove in the middle of the workpiece.

5. A special arc welding fixture for preventing welding deformation according to claim 1, characterized in that: Below the base mounting plate (1), there is also an adjustment shim (7) for adjusting the height of the support block (5). The number of adjustment shims (7) below the middle support block (5) is less than the number of adjustment shims below the support blocks (5) on both sides.

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