A positioning fixture for laser welding of automotive anti-collision pipes

Abstract

This utility model provides a positioning fixture for laser welding of automotive crash barrier tubes, relating to the field of fixture technology. The positioning fixture for laser welding of automotive crash barrier tubes includes: a base for supporting the automotive crash barrier tube; end face clamping mechanisms, one at each end of the base, for clamping the ends of the automotive crash barrier tube; multiple side clamping mechanisms, multiple on the base, for clamping the front and rear sides of the automotive crash barrier tube; and multiple adjustable pressing mechanisms, multiple on the base, each including a pressure plate for pressing the upper surface of the automotive crash barrier tube, and the pressure plate can adjust its angle according to the inclination of the upper surface of the automotive crash barrier tube. This application achieves full-circumferential positioning through the coordinated use of the end face clamping mechanism and the side clamping mechanism, eliminating movement during the welding process. The adaptive design of the pressure plate is compatible with crash barrier tubes with different cross-sectional inclination angles, achieving uniform distribution of clamping force, avoiding deformation caused by local stress concentration, and improving the accuracy of the laser welding trajectory.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, and more specifically, to a positioning fixture for laser welding of automotive anti-collision pipes. Background Technology

[0002] As a core component of vehicle body safety, the welding precision of automotive crash barriers directly determines their collision performance. In traditional laser welding processes, crash barriers with irregular cross-sections (such as trapezoidal or arc-shaped) and thin walls require six-degree-of-freedom constraints through fixtures. Existing technologies mainly employ a split-type positioning system: both ends are locked with mechanical chucks, the sides are radially clamped by cylinder-driven V-blocks, and the top is vertically pressed down by a rigid pressure bar.

[0003] While the above structure can achieve basic fixation, it has significant limitations: since the upper surface of the anti-collision tube often has a process tilt angle of 5°-15°, the rigid pressure bar cannot adapt to the angle change and can only apply pressure through point / line contact. This not only results in uneven distribution of clamping force, but also squeezes the tube wall, causing dent deformation and leading to an increased scrap rate. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a positioning fixture for laser welding of automotive anti-collision pipes.

[0005] This utility model provides a positioning fixture for laser welding of automotive anti-collision pipes, including: a base for supporting the automotive anti-collision pipe; An end-face clamping mechanism is provided at each end of the base to clamp the two ends of the vehicle anti-collision tube; Side clamping mechanisms, multiple of which are provided on the base, are used to clamp the front and rear sides of the vehicle anti-collision tube; An adjustable clamping mechanism is provided on the base, and the adjustable clamping mechanism includes a pressure plate. The pressure plate is used to clamp the upper surface of the car anti-collision tube, and the angle of the pressure plate can be adjusted according to the inclination of the upper surface of the car anti-collision tube.

[0006] Optionally, the adjustable clamping mechanism further includes a block and a third hydraulic cylinder, the third hydraulic cylinder being connected to the base, the output end of the third hydraulic cylinder being vertically upward and connected to the block, and the pressure plate being located on the lower surface of the block.

[0007] Optionally, the adjustable clamping mechanism further includes a positioning plate, an arc-shaped elastic plate, and a driving device. The positioning plate is connected to one side of the block, one end of the arc-shaped elastic plate is connected to the positioning plate, the other end of the arc-shaped elastic plate is connected to one end of the pressure plate, and the other end of the pressure plate is driven to the driving device so that the pressure plate rotates relative to the block.

[0008] Optionally, the adjustable clamping mechanism further includes a rubber pad connected to the lower surface of the pressure plate.

[0009] Optionally, the end face clamping mechanism includes a first hydraulic cylinder and a first clamping block, the first hydraulic cylinder being connected to the base, and the output end of the first hydraulic cylinder being connected to the first clamping block.

[0010] Optionally, the side-clamping mechanism includes a second hydraulic cylinder and a second clamping block, the second hydraulic cylinder being connected to the base, and the output end of the second hydraulic cylinder being connected to the second clamping block.

[0011] Optionally, the driving device is a cylinder, with the mounting end of the cylinder rotatably connected to the block body and the output end of the cylinder rotatably connected to the pressure plate.

[0012] The beneficial effects of this utility model positioning fixture for laser welding of automotive anti-collision tubes are as follows: The base serves as a basic support platform, with a V-groove or arc-shaped bracket on the upper part that matches the curvature of the anti-collision tube. The end face clamping mechanism is symmetrically arranged at both ends of the base, fixing the end position of the anti-collision tube by axial thrust. Multiple sets of side clamping mechanisms are evenly distributed along the length of the base, applying radial clamping force from the front and rear sides of the anti-collision tube. The base is made of high-strength steel to ensure rigidity. The end face clamping mechanism and the side clamping mechanism work together to restrict the X / Y / Z three-dimensional displacement of the automotive anti-collision tube to achieve full circumferential positioning, eliminate movement during the welding process, and the adaptive design of the pressure plate is compatible with anti-collision tubes with different cross-sectional inclination angles, achieving uniform distribution of clamping force, avoiding deformation caused by local stress concentration, and improving the accuracy of laser welding trajectory. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the positioning fixture for laser welding of automotive anti-collision pipes according to an embodiment of this utility model; Figure 2 This is a front view of a positioning fixture for laser welding of automotive anti-collision pipes according to an embodiment of this utility model; Figure 3 This is a schematic diagram of the adjustable clamping mechanism in the positioning fixture for laser welding of automotive anti-collision pipes according to an embodiment of this utility model.

[0014] Explanation of reference numerals in the attached drawings: 1. Base; 2. End face clamping mechanism; 21. First hydraulic cylinder; 22. First clamping block; 3. Side clamping mechanism; 31. Second hydraulic cylinder; 32. Second clamping block; 4. Adjustable pressing mechanism; 41. Block; 42. Third hydraulic cylinder; 43. Pressure plate; 44. Positioning plate; 45. Arc-shaped elastic plate; 46. Rubber pad; 47. Cylinder; 100. Automobile anti-collision pipe. Detailed Implementation

[0015] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0016] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] In the description of this specification, the references to terms such as "embodiment," "one embodiment," "some implementations," "exemplary," and "one implementation," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or implementation of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0018] The terms "first," "second," etc., 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.

[0019] Combination Figure 1 , Figure 2 and Figure 3 As shown, this utility model embodiment provides a positioning fixture for laser welding of automotive anti-collision pipes, including: a base 1 for supporting the automotive anti-collision pipe 100; an end face clamping mechanism 2, one at each end of the base 1, for clamping the two ends of the automotive anti-collision pipe 100; a side clamping mechanism 3, multiple on the base 1, for clamping the front and rear sides of the automotive anti-collision pipe 100; and an adjustable pressing mechanism 4, multiple on the base 1, the adjustable pressing mechanism 4 including a pressure plate 43, the pressure plate 43 for pressing the upper surface of the automotive anti-collision pipe 100, and the pressure plate 43 can adjust the angle according to the inclination of the upper surface of the automotive anti-collision pipe 100.

[0020] In this optional embodiment, the base 1 serves as a basic support platform, with a V-groove or arc-shaped bracket on the upper part that matches the curvature of the car anti-collision tube 100. The end face clamping mechanism 2 is symmetrically arranged at both ends of the base 1, and the end position of the car anti-collision tube 100 is fixed by axial thrust. Multiple sets of side clamping mechanisms 3 are evenly distributed along the length of the base 1, and radial clamping force is applied from the front and rear sides of the car anti-collision tube 100. The base 1 is made of high-strength steel to ensure rigidity. The end face clamping mechanism 2 and the side clamping mechanism 3 work together to restrict the X / Y / Z three-dimensional displacement of the car anti-collision tube 100 to achieve full circumferential positioning, eliminate the movement during the welding process, and the adaptive design of the pressure plate 43 is compatible with anti-collision tubes with different cross-sectional inclination angles. It achieves uniform distribution of clamping force, avoids deformation caused by local stress concentration, and improves the accuracy of laser welding trajectory.

[0021] Optionally, the adjustable clamping mechanism 4 also includes a block 41 and a third hydraulic cylinder 42. The third hydraulic cylinder 42 is connected to the base 1, and the output end of the third hydraulic cylinder 42 is vertically upward and connected to the block 41. The pressure plate 43 is located on the lower surface of the block 41.

[0022] Optionally, the adjustable clamping mechanism 4 also includes a positioning plate 44, an arc-shaped elastic plate 45, and a driving device. The positioning plate 44 is connected to one side of the block 41, one end of the arc-shaped elastic plate 45 is connected to the positioning plate 44, the other end of the arc-shaped elastic plate 45 is connected to one end of the pressure plate 43, and the other end of the pressure plate 43 is driven to be connected to the driving device so that the pressure plate 43 rotates relative to the block 41.

[0023] In this optional embodiment, the positioning plate 44 is vertically fixed to the side of the block 41 as the installation reference for the arc-shaped elastic plate 45. One end of the arc-shaped elastic plate 45 is fixed to the positioning plate 44, and the other end is connected to the pressure plate 43 to form an elastic hinge. The driving device (e.g., an electric actuator) is hinged to the block 41 and the pressure plate 43 at both ends to provide rotational driving force, so that when the cylinder 47 extends and retracts, it pushes the pressure plate 43 to rotate around the elastic deformation point of the arc-shaped elastic plate 45. The arc-shaped elastic plate 45 is made of spring steel, and the cylinder 47 provides active angle adjustment force, so that the pressure plate 43 can fit against the upper surface of the car anti-collision tube 100 in real time, thus broadening the scope of application.

[0024] Furthermore, the adjustable clamping mechanism 4 also includes a rubber pad 46, which is connected to the lower surface of the pressure plate 43.

[0025] In this optional embodiment, the rubber pad 46 can be fixed to the lower surface of the pressure plate 43 by adhesive or slot, and the rubber pad 46 can be made of oil-resistant nitrile rubber with anti-slip texture added to the surface. The rubber pad 46 increases the coefficient of friction and can compensate for the slight unevenness of the upper surface of the car anti-collision tube 100, thereby improving the uniformity of pressing.

[0026] Optionally, the end face clamping mechanism 2 includes a first hydraulic cylinder 21 and a first clamping block 22. The first hydraulic cylinder 21 is connected to the base 1, and the output end of the first hydraulic cylinder 21 is connected to the first clamping block 22.

[0027] In this optional embodiment, the two first clamping blocks 22 can provide high-rigidity axial restraint to both ends of the anti-collision tube 100, thereby improving the stability of the anti-collision tube 100 during welding and thus improving the welding quality.

[0028] Furthermore, the side clamping mechanism 3 includes a second hydraulic cylinder 31 and a second clamping block 32. The second hydraulic cylinder 31 is connected to the base 1, and the output end of the second hydraulic cylinder 31 is connected to the second clamping block 32.

[0029] In this optional embodiment, multiple sets of side clamping mechanisms 3 are arranged in an alternating pattern. The surface of the second clamping block 32 can be coated with a hard alloy layer to enhance wear resistance. The two sides of the vehicle anti-collision tube 100 are clamped synchronously by multiple sets of side clamping mechanisms 3 to improve the stability during laser welding.

[0030] Optionally, the driving device is a cylinder 47, the mounting end of the cylinder 47 is rotatably connected inside the block 41, and the output end of the cylinder 47 is rotatably connected to the pressure plate 43.

[0031] In this optional embodiment, the cylinder 47 is hinged to the inner cavity of the block 41 via a pin, and the piston rod (output end of the cylinder 47) can be connected to the upper surface of the pressure plate 43 via a ball joint.

[0032] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A positioning fixture for laser welding of automotive anti-collision pipes, characterized in that, include: Base (1), used to support the car crash tube (100); An end face clamping mechanism (2) is provided at each end of the base (1) for clamping the two ends of the vehicle anti-collision tube (100); Side abutment mechanism (3), multiple of which are provided on the base (1), for abutting the front and rear sides of the vehicle anti-collision tube (100); An adjustable clamping mechanism (4) is provided on the base (1) in multiple ways. The adjustable clamping mechanism (4) includes a pressure plate (43). The pressure plate (43) is used to clamp the upper surface of the car anti-collision tube (100), and the pressure plate (43) can adjust the angle according to the inclination of the upper surface of the car anti-collision tube (100).

2. The positioning jig for laser welding of automobile bumper beam according to claim 1, wherein The adjustable clamping mechanism (4) also includes a block (41) and a third hydraulic cylinder (42). The third hydraulic cylinder (42) is connected to the base (1). The output end of the third hydraulic cylinder (42) is vertically upward and connected to the block (41). The pressure plate (43) is located on the lower surface of the block (41).

3. The positioning fixture for laser welding of automobile bumper beam according to claim 2, wherein, The adjustable clamping mechanism (4) further includes a positioning plate (44), an arc-shaped elastic plate (45), and a driving device. The positioning plate (44) is connected to one side of the block (41). One end of the arc-shaped elastic plate (45) is connected to the positioning plate (44), and the other end of the arc-shaped elastic plate (45) is connected to one end of the pressure plate (43). The other end of the pressure plate (43) is driven to be connected to the driving device so that the pressure plate (43) rotates relative to the block (41).

4. The positioning jig for laser welding of automobile bumper beam according to claim 3, wherein The adjustable clamping mechanism (4) also includes a rubber pad (46) connected to the lower surface of the pressure plate (43).

5. The positioning fixture for laser welding of automobile bumper beam according to claim 4, wherein, The end face clamping mechanism (2) includes a first hydraulic cylinder (21) and a first clamping block (22). The first hydraulic cylinder (21) is connected to the base (1), and the output end of the first hydraulic cylinder (21) is connected to the first clamping block (22).

6. The positioning fixture for laser welding of automobile bumper beam according to claim 5, wherein, The side clamping mechanism (3) includes a second hydraulic cylinder (31) and a second clamping block (32). The second hydraulic cylinder (31) is connected to the base (1), and the output end of the second hydraulic cylinder (31) is connected to the second clamping block (32).

7. The positioning fixture for laser welding of automobile bumper beam according to claim 6, wherein The driving device is a cylinder (47), the mounting end of the cylinder (47) is rotatably connected inside the block (41), and the output end of the cylinder (47) is rotatably connected to the pressure plate (43).

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