A new laser welding straight line welding positioning device

Abstract

This invention discloses a novel laser-welded linear welding positioning device, relating to the field of laser welding technology for automotive sheet metal. It includes a pressure rod, with sliding mechanisms on both the left and right sides of the pressure rod's outer surface. Through the cooperation of a fastening bolt, spring, and pressure rod, this invention allows for fine-tuning according to the workpiece thickness. Regardless of whether a thick or thin plate is selected as the positioning reference surface, the device achieves rapid and reliable positioning. Its unique stop design, combined with the base plate reference surface, forms a combined positioning system. This avoids the welding scrap problem caused by the second plate exceeding the reference edge due to differences in plate thickness in traditional welding, and significantly improves the repeatability of the welding process and the quality of the weld seam. The cooperation of the pressure rod and sliding mechanisms allows the device to move flexibly along the workpiece surface, thereby achieving rapid positioning of weld seams at different locations, ensuring efficient and stable positioning, and significantly improving the adaptability and efficiency of welding operations.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology for automotive sheet metal, and specifically to a novel laser welding linear welding positioning device. Background Technology

[0002] Laser-guided linear welding (TWB) is a key welding technology in modern precision manufacturing. It uses a high-energy-density laser beam as a heat source to fuse two or more metal sheets (supporting combinations of the same / different materials, same / different thicknesses, and coated / uncoated materials) along a pre-set straight trajectory. This technology, with its core characteristics of "straight welds, no lap overlap, and direct post-weld processing," is widely used in components such as A / B / C pillars, sill beams, floor longitudinal beams, side panels, and door ring assemblies, achieving optimized designs by "thickening strong areas and thinning weak areas." This not only helps reduce vehicle weight, lower fuel and energy consumption, but also improves the vehicle's load-bearing capacity and deformation resistance during collisions. Therefore, this technology requires a positioning device.

[0003] The existing technology has the following problems: Conventional linear laser welding positioning typically uses a thick substrate as a positioning reference. However, substrate positioning has significant limitations when welding large components such as door rings, especially when involving welding combinations of different thicknesses. Door rings, as closed ring structures, require 2 to 3 welds to achieve a seal, and are usually composed of 3 to 5 different thicknesses of sheet metal. It is difficult to ensure that each weld uses a thicker plate for positioning. Figure 3 If a thick plate is used for positioning in weld seam one, then only a thin plate can be used as the positioning reference for weld seam two. During the process of the thin plate being positioned and the second plate being tightly fitted, the second plate often exceeds the reference edge due to the thinness of the positioning plate, resulting in positioning failure and ultimately causing the welded parts to be scrapped.

[0004] Therefore, we need a new type of laser-assisted linear welding positioning device to solve the above problems. Summary of the Invention

[0005] This invention provides a novel laser-welded linear welding positioning device to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A novel laser-welded linear welding positioning device includes a pressure rod. Sliding mechanisms are provided on both the left and right sides of the outer surface of the pressure rod. The two sliding mechanisms have identical structures and each includes a square sleeve. An L-shaped handle is fixedly connected to the front and rear of the upper surface of the square sleeve. The interior of the square sleeve is slidably connected to the outer surface of the pressure rod. A fastening bolt is threaded through the front of the upper surface of the square sleeve. A rotating head is fixedly connected to the upper end of the fastening bolt, and the lower end of the fastening bolt contacts and presses against the surface of the pressure rod. A mounting block is fixedly connected to the front of the square sleeve. A connecting rod, a spring, a circular ring, and a stop block are provided on the lower surface of the mounting block.

[0007] A further improvement of the technical solution of the present invention is that: the outer surface of the connecting rod slides through the interior of the mounting block, and an anti-detachment ring is fixedly connected above the outer surface of the connecting rod, with the lower surface of the anti-detachment ring corresponding to the upper surface of the mounting block.

[0008] A further improvement of the technical solution of the present invention is that: the outer surface of the connecting rod is sleeved with the inside of the spring, and the upper end of the spring is fixedly connected to the lower surface of the mounting block.

[0009] A further improvement of the technical solution of the present invention is that: the lower end of the spring contacts and corresponds to the upper surface of the circular ring, and the lower part of the outer surface of the connecting rod is connected to the internal thread of the circular ring.

[0010] A further improvement of the technical solution of the present invention is that the lower end of the connecting rod is fixedly connected to the upper surface of the stop block.

[0011] A further improvement of the technical solution of the present invention is that the lower surface of the stop is a planar structure or a structure with anti-slip texture, so as to improve the stability and friction when in contact with the substrate.

[0012] A further improvement of the technical solution of the present invention is that an anti-loosening structure is provided between the fastening bolt and the square sleeve to prevent loosening under vibration conditions.

[0013] A further improvement of the technical solution of the present invention is that: the outer surface of the pressure rod is provided with scale markings to indicate the position of the sliding mechanism, so as to enable quick adjustment and repeated positioning.

[0014] A further improvement of the technical solution of the present invention is that a guide fit structure is provided between the square sleeve and the pressure rod to improve the stability of the sliding process and reduce shaking.

[0015] A further improvement of the technical solution of the present invention is that the spring is a compression spring or a disc spring, used to provide an adjustable elastic clamping force according to different workpiece thicknesses.

[0016] Due to the adoption of the above technical solution, the technical progress achieved by this invention compared to the prior art is as follows: 1. This invention provides a novel laser-welded linear welding positioning device. Through the cooperation of fastening bolts, springs, and pressure rods, it can be finely adjusted according to the thickness of the workpiece. Regardless of whether a thick or thin plate is selected as the positioning reference surface, the device can achieve fast and reliable positioning. Its unique stop block design and the base plate reference surface form a combined positioning system, which not only avoids the welding scrap problem caused by the second plate crossing the reference edge due to the difference in plate thickness in traditional welding, but also significantly improves the repeatability of the welding process and the quality of the joint.

[0017] 2. This invention provides a novel laser-welded linear welding positioning device. Through the cooperation of a pressure rod and a sliding mechanism, the device can move flexibly along the surface of the workpiece, thereby achieving rapid positioning of welds at different positions, ensuring efficient and stable positioning, and significantly improving the adaptability and efficiency of welding operations. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the sliding mechanism structure of the present invention; Figure 3 This is a schematic diagram of the cross-section of two weld seams in the laser-welded door ring of the present invention; Figure 4 This is a top view of the two weld seams of the door ring laser welding according to the present invention.

[0019] In the diagram: 1. Pressure rod; 2. Sliding mechanism; 21. Square sleeve; 22. L-shaped handle; 23. Fastening bolt; 24. Rotating head; 25. Mounting block; 26. Connecting rod; 27. Spring; 28. Circular ring; 29. ​​Stop block; 210. Anti-detachment ring; 3. Base plate one; 4. Base plate three; 5. Base plate two; 6. Base plate four; 7. Weld one; 8. Weld two. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] Example 1: As Figures 1 to 4 As shown, the present invention provides a novel laser welding linear welding positioning device, including a pressure rod 1. The pressure rod 1 is used to support the sliding mechanisms 2 on both sides, providing a stable mounting and sliding carrier for the sliding mechanisms 2. Sliding mechanisms 2 are provided on both the left and right sides of the outer surface of the pressure rod 1. The two sliding mechanisms 2 have the same structure and are used to correspond to the position of the weld. In addition, the number of sliding mechanisms 2 can be increased according to the actual situation.

[0022] The lower surfaces of the stops 29 in the two sliding mechanisms 2 are respectively provided with substrates, which include substrate 3, substrate 5, substrate 4, and substrate 6. A weld 7 is formed between substrate 3 and substrate 4, and a weld 8 is formed between substrate 5 and substrate 6. Substrate 3 in weld 7 is in contact with the stop 29 in the left sliding mechanism 2 of the pressure rod 1, and substrate 5 in weld 8 is in contact with the stop 29 in the right sliding mechanism 2 of the pressure rod 1.

[0023] Example 2: Figures 1 to 4 As shown, both sliding mechanisms 2 include a square sleeve 21. An L-shaped handle 22 is fixedly connected to the front and rear of the upper surface of the square sleeve 21. The L-shaped handle 22 is designed for easy gripping by personnel to adjust the position of the sliding mechanism 2. The interior of the square sleeve 21 is slidably connected to the outer surface of the pressure rod 1, allowing the square sleeve 21 to slide smoothly along the pressure rod 1. A fastening bolt 23 is threaded through the front of the upper surface of the square sleeve 21. The fastening bolt 23 is used to lock the position of the square sleeve. A rotating head 24 is fixedly connected to the upper end of the fastening bolt 23. The rotating head 24 is designed for easy gripping and rotation of the fastening bolt 24. The lower end of the fastening bolt 23 contacts and presses against the surface of the pressure rod 1. A mounting block 25 is fixedly connected to the front of the square sleeve 21. The mounting block 25 is used to install components such as the connecting rod 26 and the spring 27. The lower surface of the mounting block 25 is provided with the connecting rod 26, the spring 27, the circular ring 28, and the stop block 29.

[0024] The outer surface of the connecting rod 26 slides through the interior of the mounting block 25, allowing the connecting rod 26 to slide up and down along the mounting block 25. An anti-detachment ring 210 is fixedly connected above the outer surface of the connecting rod 26, with its lower surface corresponding to the upper surface of the mounting block 25. This anti-detachment ring limits the travel of the connecting rod 26 and prevents it from detaching from the mounting block 25 when sliding downwards. The outer surface of the connecting rod 26 is sleeved inside the spring 27, and the upper end of the spring 27 is fixedly connected to the lower surface of the mounting block 25. The extension and retraction of the spring 27 corrects the thickness difference of the substrate, ensuring… The continuity of the positioning surface ensures stable and effective positioning. The lower end of the spring 27 contacts the upper surface of the circular ring 28, which bears the elastic force of the spring 27. The lower outer surface of the connecting rod 26 is connected to the internal thread of the circular ring 28. The threaded connection facilitates the adjustment of the position of the circular ring 28, thereby adjusting the elastic force of the spring 27. The lower end of the connecting rod 26 is fixedly connected to the upper surface of the stop block 29, which is a pressing component that directly contacts the workpiece and is used to directly press the workpiece surface to achieve workpiece positioning for subsequent welding.

[0025] Example 3: In this example, the novel laser-welded linear welding positioning device is applied to the continuous linear welding of multi-thickness composite plates, and is particularly suitable for door ring-type structures with multiple weld seams and significant thickness differences. Specifically, three steel plates of different thicknesses are selected as the welding objects, with the first substrate having a thickness of 1.8mm, the second substrate having a thickness of 1.2mm, and the third substrate having a thickness of 0.8mm, corresponding to the splicing requirements of different weld seam areas.

[0026] During use, first, the pressure rod 1 is installed on the tooling base of the welding equipment, so that the pressure rod 1 is arranged parallel to the welding path. Then, according to the location of each weld, two or more sliding mechanisms 2 are moved along the pressure rod 1 to the corresponding area. After pushing the square sleeve 21 to the target position by the L-shaped handle 22, the fastening bolt 23 is rotated to press its lower end against the surface of the pressure rod 1, thereby achieving quick locking of the sliding mechanism 2.

[0027] Subsequently, based on the thickness difference of the plates at each welding location, the relative position of the connecting rod 26 and the circular ring 28 is adjusted. By rotating the circular ring 28, its axial position on the connecting rod 26 is changed, thereby pre-adjusting the compression of the spring 27. This ensures that the spring 27 can provide appropriate elastic compensation force when contacting substrates of different thicknesses. Specifically, for thicker substrate areas, the pre-compression of the spring 27 is appropriately reduced to keep the stop 29 flush with the substrate surface; for thinner substrate areas, the pre-compression of the spring 27 is appropriately increased to allow the stop 29 to compensate for downward displacement, thus ensuring that all positioning surfaces form a uniform reference plane.

[0028] After the device is adjusted, each substrate is placed sequentially on the welding fixture, and the first substrate's contact block 29 forms a combined positioning surface with the reference surface. Under the downward pressure applied by the pressure rod 1, the block 29, through the connecting rod 26, drives the spring 27 to undergo elastic deformation, ensuring that the block 29 remains in close contact with the substrate surface. Subsequently, the second substrate is pushed against the combined positioning surface along the positioning direction. Because the block 29 compensates for the height difference caused by the thickness difference, the second substrate will not cross the positioning boundary, thus effectively avoiding the boundary crossing problem that easily occurs during traditional thin plate positioning.

[0029] During continuous multi-weld processing, the sliding mechanism 2 can be quickly moved to the next weld position and re-locked by loosening the fastening bolt 23, without the need for complete disassembly of the device, greatly improving the equipment adjustment efficiency. At the same time, the anti-detachment ring 210 limits the stroke of the connecting rod 26, ensuring structural stability and reliability during frequent adjustments, and preventing detachment.

[0030] Through the above-described structure and adjustment method, this embodiment can achieve the construction and stable positioning of a unified reference surface in complex welding scenarios with multiple thicknesses and weld seams, effectively improving weld straightness, splicing accuracy and welding consistency, and significantly reducing the rework rate caused by positioning deviation.

[0031] Working principle: First, fix substrate 1 3 and substrate 2 5 onto the tooling of the laser welding equipment. Align the pressure rod 1 and sliding mechanism 2 with the required positions on the workpiece, and adjust the position of the sliding mechanism 2. After the position is adjusted, rotate the fastening bolt 23 to lock it. Then, apply pressure to the pressure rod 1, and the stop 29 presses down on the substrate. The positioning surface of the stop 29 is flush with the positioning surface of the substrate, forming a new positioning surface. Then, the second substrate moves closer to the positioning surface. Since the stop 29 increases the height of the positioning surface, the second substrate will not pass through the positioning surface, thus increasing the positioning stability.

[0032] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A novel laser-welded linear welding positioning device, comprising a pressure rod (1), characterized in that: Sliding mechanisms (2) are provided on both the left and right sides of the outer surface of the pressure rod (1). The two sliding mechanisms (2) have the same structure. Both sliding mechanisms (2) include a square sleeve (21). An L-shaped handle (22) is fixedly connected to the front and rear of the upper surface of the square sleeve (21). The interior of the square sleeve (21) is slidably connected to the outer surface of the pressure rod (1). A fastening bolt (23) is threaded through the front of the upper surface of the square sleeve (21). A rotating head (24) is fixedly connected to the upper end of the fastening bolt (23). The lower end of the fastening bolt (23) is in contact with and pressed against the surface of the pressure rod (1). An installation block (25) is fixedly connected to the front of the square sleeve (21). A connecting rod (26), a spring (27), a circular ring (28), and a stop block (29) are provided on the lower surface of the installation block (25).

2. The novel laser-welded linear welding positioning device according to claim 1, characterized in that: The outer surface of the connecting rod (26) slides through the interior of the mounting block (25). An anti-detachment ring (210) is fixedly connected above the outer surface of the connecting rod (26). The lower surface of the anti-detachment ring (210) contacts and corresponds to the upper surface of the mounting block (25).

3. The novel laser-welded linear welding positioning device according to claim 1, characterized in that: The outer surface of the connecting rod (26) is sleeved with the inside of the spring (27), and the upper end of the spring (27) is fixedly connected to the lower surface of the mounting block (25).

4. The novel laser-welded linear welding positioning device according to claim 1, characterized in that: The lower end of the spring (27) contacts the upper surface of the circular ring (28), and the lower part of the outer surface of the connecting rod (26) is threadedly connected to the inner surface of the circular ring (28).

5. A novel laser-welded linear welding positioning device according to claim 1, characterized in that: The lower end of the connecting rod (26) is fixedly connected to the upper surface of the stop (29).

6. The novel laser-welded linear welding positioning device according to claim 1, characterized in that: The lower surface of the stop (29) is a planar structure or a structure with anti-slip texture to improve stability and friction when in contact with the substrate.

7. A novel laser-welded linear welding positioning device according to claim 1, characterized in that: An anti-loosening structure is provided between the fastening bolt (23) and the square sleeve (21) to prevent loosening under vibration conditions.

8. A novel laser-welded linear welding positioning device according to claim 1, characterized in that: The outer surface of the pressure rod (1) is provided with scale markings to indicate the position of the sliding mechanism (2) so as to enable quick adjustment and repeated positioning.

9. A novel laser-welded linear welding positioning device according to claim 1, characterized in that: A guide fit structure is provided between the square sleeve (21) and the pressure rod (1) to improve the stability of the sliding process and reduce shaking.

10. A novel laser-welded linear welding positioning device according to claim 1, characterized in that: The spring (27) is a compression spring or a disc spring, used to provide an adjustable elastic clamping force according to different workpiece thicknesses.

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