Laser hybrid welding device capable of preventing workpiece deformation

Abstract

The invention discloses a laser hybrid welding device capable of preventing workpiece deformation, and relates to the field of laser welding. According to the technical scheme, the welding device comprises a welding table and a welding part arranged on the welding table, and is characterized by further comprising stabilizing parts symmetrically arranged on the two sides of the welding part and used for clamping the two ends of a workpiece, each stabilizing part comprises a first stabilizing arm and a second stabilizing arm which are oppositely arranged, and the first stabilizing arms and the second stabilizing arms are the same in structure; each clamping part comprises a supporting frame, a double-end lead screw rotationally connected to the supporting frame, guide rods arranged on the two sides of the double-end lead screw in parallel, a first motor used for driving the double-end lead screw and two clamping parts which are symmetrically arranged and are in threaded fit with the two ends of the double-end lead screw. The pressing force of each clamping point is controlled through the oil cylinder, the optimal clamping force can be preset according to the material and the wall thickness of the workpiece, the positioning stability is guaranteed, initial stress deformation of the workpiece caused by over-clamping is avoided, and deformation inducements are reduced.

Description

Technical Field

[0001] This invention relates to the field of laser welding, and more particularly to a laser composite welding device that can prevent workpiece deformation. Background Technology

[0002] Laser welding, with its advantages of high energy density, low heat input, small deformation, and fast welding speed, is widely used in precision welding fields such as pipe butt welding. However, when welding thin-walled pipes or tubular workpieces with a large length-to-diameter ratio, the workpiece itself is not rigid enough, and deformation is still easy to occur during clamping and welding. In the existing technology, rigid clamps are mostly used to fix the workpiece. Although they can ensure positioning accuracy, excessive clamping force can easily cause local indentation or internal stress in the workpiece. Under the combined action of welding heat input, the release of this internal stress can easily cause workpiece warping or weld joint misalignment, affecting the welding quality. In addition, traditional support mechanisms are mostly fixed and cannot adapt to workpieces of different diameters and the small deformation caused by thermal deformation during welding. They lack effective flexible support and follow-up capabilities. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a laser composite welding device that can prevent workpiece deformation in order to solve the above problems.

[0004] To achieve the above-mentioned technical objectives, the present invention provides a laser composite welding device that can prevent workpiece deformation: It includes a welding table and a welding part disposed on the welding table, characterized in that: it further includes stabilizing parts symmetrically disposed on both sides of the welding part for clamping both ends of the workpiece, the stabilizing parts including a first stabilizing arm and a second stabilizing arm disposed opposite to each other, the first stabilizing arm and the second stabilizing arm having the same structure; Each includes a support frame, a double-ended lead screw rotatably connected to the support frame, guide rods arranged parallel to both sides of the double-ended lead screw, a first motor for driving the double-ended lead screw, and two symmetrically arranged clamping parts that are threaded to both ends of the double-ended lead screw.

[0005] Preferably, the welding section includes a Y-axis slide, an X-axis slide, and a laser welding gun. The Y-axis slide is fixed on the welding table, the X-axis slide is fixed to the output section of the Y-axis slide, and the two slides are perpendicular to each other in space. The laser welding gun is installed on the output section of the X-axis slide.

[0006] Preferably, the threads at both ends of the double-ended lead screw have opposite directions of rotation.

[0007] Preferably, the clamping part includes a slide block slidably connected to the guide rod and threadedly connected to a double-ended lead screw, a support arm with one end hinged to the slide block, and a hydraulic cylinder fixed on the clamping seat. The output end of the hydraulic cylinder is hinged to the middle or far end of the support arm. The swing amplitude of the support arm is controlled by the extension and retraction of the hydraulic cylinder to adjust the clamping force of the clamping seat on the workpiece.

[0008] Preferably, the two clamping parts of the first stabilizing arm and the two clamping parts of the second stabilizing arm are arranged in a quadrilateral shape in space, together forming a four-point clamping and positioning of the tubular workpiece.

[0009] Preferably, it further includes a support part; the workpiece support part includes a car body slidably connected to the welding table via rollers with locking structure, a slide frame slidably connected to the car body, a reciprocating screw rotatably connected to the car body and threadedly connected to the slide frame, a second motor for driving the reciprocating screw, and a plurality of support rollers rotatably connected to the slide frame for supporting the workpiece.

[0010] Preferably, the number of support rollers is four, which are installed in a rectangular distribution at the four corners of the carriage, and their axial direction is parallel to the axial direction of the workpiece.

[0011] As can be seen from the above technical solutions, this application has the following beneficial effects: 1: By controlling the clamping force of each clamping point with hydraulic cylinders, the optimal clamping force can be preset according to the workpiece material and wall thickness, which not only ensures positioning stability, but also avoids the initial stress deformation of the workpiece due to over-clamping, thus reducing the causes of deformation. 2: The four-point clamping mechanism, consisting of the first and second stabilizing arms, can evenly distribute the clamping force, forcing the workpiece axis to automatically align, improving the coaxiality accuracy of butt welding, and ensuring the accuracy of the initial welding position from a mechanical structure perspective. 3: The workpiece support section adopts a combination of a horizontally movable carriage and a finely adjustable slide. The support roller can rotate with the workpiece, and its support position can be precisely adjusted, effectively compensating for the workpiece's slight bending and thermal deformation during the welding process, providing the workpiece with dynamic flexible support throughout the entire process. 4. The stabilizing unit can adapt to workpieces of different pipe diameters through a double-headed screw mechanism; the clamping, supporting and welding actions of the entire device can be coordinated and controlled by the control system, realizing an automated process from clamping to welding, which not only improves production efficiency, but also reduces the uncertainty caused by human intervention. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0013] Figure 1 A schematic diagram of the overall structure of a laser composite welding device that can prevent workpiece deformation provided by the present invention; Figure 2A schematic diagram of the overall structure of the stabilizing part of a laser composite welding device that can prevent workpiece deformation, provided by the present invention; Figure 3 A schematic diagram of the overall structure of the clamping part of a laser composite welding device that can prevent workpiece deformation, provided by the present invention; Figure 4 This is a schematic diagram of the overall structure of the workpiece support part of a laser composite welding device that can prevent workpiece deformation, provided by the present invention.

[0014] Figure descriptions: 10. Welding table; 20. Stabilizing part; 21. First stabilizing arm; 22. Second stabilizing arm; 221. Support frame; 222. Guide rod; 223. Double-ended lead screw; 224. First motor; 225. Clamping part; 2251. Slide; 2252. Support arm; 2253. Hydraulic cylinder; 2254. Clamping seat; 30. Workpiece support part; 31. Car body; 32. Slide; 33. Reciprocating lead screw; 34. Second motor; 35. Support roller; 40. Laser welding gun; 50. X-axis slide; 60. Y-axis slide. Detailed Implementation

[0015] The following description is exemplary in nature and is not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these figures, the same or similar reference numerals indicate the same or similar parts and features. The figures are merely schematic representations of the concept and principles of embodiments of this disclosure and do not necessarily show the specific dimensions and scale of the various embodiments of this disclosure. Certain details or structures of embodiments of this disclosure may be exaggerated in particular portions of certain figures.

[0016] For examples, see Figure 1 and Figure 4 A laser composite welding device that can prevent workpiece deformation is mainly used for butt welding of tubular workpieces such as pipe A and pipe B; it includes a horizontally set welding table 10 as the basic platform of the entire device. The welding table 10 is equipped with a welding section for performing welding operations. The welding section consists of a Y-axis slide 60, an X-axis slide 50, and a laser welding gun 40. The Y-axis slide 60 is fixed to the welding table 10 by bolts, and its slider can move linearly along the Y-axis direction. The X-axis slide 50 is fixedly installed on the slider of the Y-axis slide 60 through its base, and its slider can move perpendicular to the Y-axis along the X-axis direction. The laser welding gun 40 is finally installed on the slider of the X-axis slide 50. By controlling the coordinated movement of the X-axis slide 50 and the Y-axis slide 60, the laser welding gun 40 can be driven to reach any specified position in the horizontal plane to adapt to the circumferential welding path of workpieces with different diameters. Furthermore, stabilizing parts 20 are symmetrically arranged on the left and right sides of the welding section. The two sets of stabilizing parts 20 are used to clamp the ends of the pipes A and B to be connected, respectively. Each set of stabilizing parts 20 consists of a first stabilizing arm 21 and a second stabilizing arm 22 arranged opposite to each other. Taking the second stabilizing arm 22 as an example, its support frame 221 is fixed to the welding table 10 by bolts. A double-ended lead screw 223 is rotatably connected to the support frame 221 through bearings. The two ends of the double-ended lead screw 223 are machined with threads in opposite directions. On both sides of the double-ended lead screw 223, two smooth guide rods 222 are fixed in parallel. The first motor 224 is fixed to the support frame 221 through a motor base. Its output shaft is connected to one end of the double-ended lead screw 223 through a coupling to drive it to rotate forward and backward. Specifically, the slide 2251 of each clamping part 225 simultaneously slides with two guide rods 222 and engages with the threaded section of the double-ended lead screw 223. When the first motor 224 drives the double-ended lead screw 223 to rotate, the two slides 2251 will move synchronously towards or away from each other, thereby adjusting the distance between the two clamping parts 225 to accommodate pipes of different diameters. A support arm 2252 is hinged to the slide 2251, and a clamping seat 2254 adapted to the curvature of the outer wall of the pipe is installed at the distal end of the support arm 2252. The hydraulic cylinder 2253... The cylinder body is hinged to the slide block 2251 or a fixed fulcrum, and the end of its piston rod is hinged to the middle of the support arm 2252. By precisely controlling the pressure and stroke of the oil cylinder 2253, the support arm 2252 can be driven to swing, so that the clamping seat 2254 presses against the outer wall of the pipe with a set force. This design makes the clamping force controllable and adjustable, realizing "rigid positioning and flexible clamping", effectively preventing clamping deformation. The four clamping points on the first stabilizing arm 21 and the second stabilizing arm 22 work together to form a stable quadrilateral clamping area.

[0017] Furthermore, the welding table 10 is equipped with a workpiece support 30, which is located directly below the workpiece and is used to support the pipe. The workpiece support 30 includes a carriage 31, and the bottom of the carriage 31 is equipped with universal wheels or track wheels with locking function, which can be pushed along the surface of the welding table 10 to a suitable position and then locked. A slide 32 is provided on the carriage 31, and the slide 32 and the carriage 31 are slidably connected through a linear guide pair. A reciprocating screw 33 is rotatably connected to the carriage 31 through a bearing seat and is threadedly engaged with a nut at the bottom of the slide 32. A second motor 34 is fixed to the carriage 31 and is used to drive the reciprocating screw 33 to rotate, thereby driving the slide 32 and its components to make fine adjustments along the workpiece axis. A support roller 35 is installed at each of the four corners of the slide 32 through a bearing seat. The axis of the support roller 35 is parallel to the axis of the workpiece and can rotate freely, so as to support the workpiece without affecting the rotational movement of the workpiece, which facilitates the rotational welding of the pipe.

[0018] It is worth mentioning that this embodiment also includes a control system electrically connected to the first motor 224, the second motor 34, the hydraulic cylinder 2253, the Y-axis slide 60, the X-axis slide 50, and the laser welding gun 40. The control system is based on a PLC to achieve automatic operation. The control system is used to coordinate and control the clamping, supporting, and welding actions. The welding program built into the control system is written by those skilled in the art according to the actual situation, and will not be elaborated on here.

[0019] Working principle: During operation, pipes A and B are first placed between the stabilizing parts 20 and initially supported by the support rollers 35 of the workpiece support part 30. The position of the car body 31 is then adjusted and locked. Then, the second motor 34 finely adjusts the slide 32 to make the support roller 35 accurately support the workpiece docking point. The first motor 224 is started to make the four clamping parts 225 approach and contact the outer wall of the workpiece. Subsequently, the control system controls the action of each oil cylinder 2253 according to the preset pressure value to achieve four-point flexible constant force clamping. Finally, the welding program is started, and the laser welding gun 40 performs welding under the drive of the slide table. The workpiece is stable throughout the process, effectively avoiding deformation.

[0020] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A laser composite welding device that can prevent workpiece deformation, characterized in that, The welding device comprises a welding table (10) and a welding part arranged on the welding table (10), characterized in that the welding device further comprises stable parts (20) symmetrically arranged on both sides of the welding part for clamping two ends of a workpiece, the stable part (20) comprises a first stable arm (21) and a second stable arm (22) arranged oppositely, and the first stable arm (21) and the second stable arm (22) are identical in structure. Both the welding device and the stable part comprise a support frame (221), a double-head screw rod (223) rotatably connected to the support frame (221), guide rods (222) arranged in parallel on both sides of the double-head screw rod (223), a first motor (224) for driving the double-head screw rod (223), and two clamping parts (225) symmetrically arranged and threadedly matched with both ends of the double-head screw rod (223).

2. The laser composite welding apparatus capable of preventing deformation of a workpiece according to claim 1, wherein The welding part comprises a Y-axis sliding table (60), an X-axis sliding table (50), and a laser welding gun (40), the Y-axis sliding table (60) is fixed to the welding table (10), the X-axis sliding table (50) is fixed to an output part of the Y-axis sliding table (60) and the spatial orientations of the two are perpendicular to each other, and the laser welding gun (40) is installed on an output part of the X-axis sliding table (50).

3. The laser composite welding apparatus capable of preventing the deformation of a workpiece according to claim 1, wherein The thread directions of both ends of the double-head screw rod (223) are opposite.

4. The laser composite welding apparatus capable of preventing the deformation of a workpiece according to claim 1, wherein The clamping part (225) comprises a sliding seat (2251) slidably connected with the guide rod (222) and threadedly connected with the double-head screw rod (223), a support arm (2252) hingedly connected at one end with the sliding seat (2251), and an oil cylinder (2253) fixed to a clamping seat (2254), an output end of the oil cylinder (2253) is hingedly connected with a middle part or a distal end of the support arm (2252), and the swinging amplitude of the support arm (2252) is controlled by the extension and retraction of the oil cylinder (2253) to adjust the pressing force of the clamping seat (2254) on the workpiece.

5. The laser composite welding apparatus capable of preventing the deformation of a workpiece according to claim 1, wherein The two clamping parts (225) of the first stable arm (21) and the two clamping parts (225) of the second stable arm (22) are distributed in a quadrilateral in space, and together constitute four-point clamping positioning of the tubular workpiece.

6. The laser composite welding apparatus capable of preventing the deformation of a workpiece according to claim 1, wherein The welding device further comprises a support part (30), the workpiece support part (30) comprises a vehicle body (31) slidably connected to the welding table (10) through a roller with a locking structure, a sliding frame (32) slidably connected to the vehicle body (31), a reciprocating screw rod (33) rotatably connected to the vehicle body (31) and threadedly connected with the sliding frame (32), a second motor (34) for driving the reciprocating screw rod (33), and a plurality of support rollers (35) rotatably connected to the sliding frame (32) for supporting the workpiece.

7. The laser composite welding apparatus capable of preventing the workpiece from being deformed according to claim 6, wherein The number of the support rollers (35) is four, which are installed in a rectangular distribution at the four corners of the sliding frame (32), and the axial directions of the support rollers (35) are parallel to the axial direction of the workpiece.

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