Laser pressure welding system

Abstract

The invention provides a laser pressure welding system which relates to laser processing and comprises a rack, a laser welding head capable of being connected with a laser source is arranged on the rack, the output end of the laser welding head is connected with a hollow first connecting piece, and a copper nozzle is arranged at the end, away from the laser welding head, of the first connecting piece; the rack is further provided with a driving mechanism capable of driving the copper nozzle to move up and down so that the copper nozzle can be pressed on the upper surface of the workpiece. By the adoption of the structure, gaps of parts are eliminated through pressurization of the driving mechanism, and reliable gap elimination of high-rhythm machining is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to laser processing, in particular to a laser press welding system. BACKGROUND

[0002] As a kind of high-energy beam processing technology, laser welding has been widely used in the fields of automobile manufacturing, aerospace, etc. due to its high energy density, narrow heat-affected zone, small welding deformation and easy automation. Its process can be generally divided into two modes: heat conduction welding and deep penetration welding. When the laser power density is high enough, a weld with large depth-width ratio can be formed, significantly improving the welding efficiency and joint quality. However, this technology gradually exposes its inherent limitations in actual industrial application, especially in the current background of automobile industry emphasizing cost reduction and efficiency improvement. On the one hand, laser welding has extremely strict requirements on the assembly accuracy of workpieces. The welding position must be accurately within the focusing range of the laser beam, and the gap between the joints must be strictly controlled. Otherwise, defects such as uneven weld and incomplete fusion may occur due to beam deviation or uneven energy absorption, which may further cause quality problems such as water leakage of automobile body. On the other hand, the initial investment of laser welding system is huge, and the maintenance cost is high, which brings great pressure to the production cost control.

[0003] In the current manufacturing industry, the competition is increasingly fierce, and the automobile manufacturers generally implement cost reduction and efficiency improvement strategies. Under this background, the processing accuracy of many raw materials or stamped parts is difficult to continuously and stably meet the strict requirements of laser welding. To cope with the difficulties of high gap requirement between traditional laser welding and insufficient assembly accuracy, complex tooling or the introduction of weld tracking and real-time quality monitoring systems are usually required for compensation in the existing technology. However, these solutions often further increase the complexity and cost of the system, or still fail to fundamentally solve the problem of stable gap control under high production rate conditions.

[0004] Therefore, there is an urgent need for a new welding method that can effectively reduce the dependence on raw material processing accuracy while ensuring welding quality and being cost controllable. SUMMARY

[0005] To overcome the existing technical problems, the present application provides a laser press welding system which eliminates the gap between parts through a driving mechanism.

[0006] The present application adopts the following technical solutions.

[0007] A laser press welding system comprises a rack, a laser welding head connected with a laser source on the rack, a hollow first connecting piece connected with the output end of the laser welding head, a copper nozzle provided at the end of the first connecting piece away from the laser welding head, and a driving mechanism provided on the rack and capable of driving the copper nozzle to move up and down, so that the copper nozzle can be pressed on the upper surface of the workpiece.

[0008] As a further improvement of the present application, the frame is further provided with a pressing block below the copper nozzle, and the driving mechanism drives the copper nozzle to move downwards so that the copper nozzle and the pressing block abut against the upper and lower surfaces of the workpiece respectively.

[0009] As a further improvement of the present application, the copper nozzle is provided with a hollow second connecting piece between the copper nozzle and the first connecting piece, the first connecting piece is inserted into the second connecting piece, the second connecting piece is provided with a first air-permeable through hole, and the outer side wall of the first connecting piece and the inner side wall of the second connecting piece have an air-permeable channel in communication with the first air-permeable through hole.

[0010] As a further improvement of the present application, the first air-permeable through hole is located above the lower edge of the first connecting piece, so that the first connecting piece, the second connecting piece and the copper nozzle surround and cover the periphery of the laser path.

[0011] As a further improvement of the present application, the frame is provided with a sliding rail and sliding block assembly, and the laser welding head is connected to the sliding rail and sliding block assembly, so that the driving mechanism can drive the copper nozzle to move up and down.

[0012] As a further improvement of the present application, the output end of the driving mechanism is connected with a support plate, the support plate is connected with the laser welding head, the support plate is provided with a transition through hole, and the copper nozzle is detachably connected to the support plate and in communication with the transition through hole.

[0013] As a further improvement of the present application, the second connecting piece is provided with a second air-permeable through hole, and a dust removal device in communication with the second air-permeable through hole, so that the welding smoke can flow through the first air-permeable through hole, the air-permeable channel and the second air-permeable through hole to be discharged.

[0014] As a further improvement of the present application, the driving mechanism is a servo motor.

[0015] As a further improvement of the present application, a gun cleaning device is further included, the gun cleaning device comprises a steel brush capable of being inserted into the copper nozzle and a pneumatic mechanism capable of driving the steel brush to rotate.

[0016] As a further improvement of the present application, the inner side wall of the second connecting piece is provided with a slope facing the air-permeable channel.

[0017] The present application has the following advantages: the driving mechanism is used to press and eliminate the gap between parts, so that reliable gap elimination for high rhythm processing is realized. The sealing connection of the copper nozzle, the first connecting piece and the second connecting piece realizes the sealing welding of the laser welding head, avoids the leakage of laser, eliminates the need for an additional laser room, and further reduces the complexity and cost of the system. The welding smoke can be discharged from the second connecting piece, and a special air duct design is used to prevent welding splashing. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0019] Figure 1 is a structural schematic diagram of a first embodiment of the present application; Figure 2 is a structural schematic diagram of another angle of the first embodiment of the present application; Figure 3 is a structural schematic diagram of a second embodiment of the present application; Figure 4 is a partial sectional view of the present application.

[0020] Explanation of reference signs: 1, rack; 11, first connecting piece; 12, copper nozzle; 13, pressing block; 14, driving mechanism; 2, laser welding head; 3, second connecting piece; 31, first air-permeable through hole; 32, second air-permeable through hole; 33, inclined surface; 4, air-permeable channel; 5, slide rail and slide block assembly; 6, support plate; 61, transition through hole. DETAILED DESCRIPTION

[0021] The drawings are only used for illustrative description and should not be understood as a limitation to the present application; in order to better illustrate the embodiments, some components in the drawings may be omitted, enlarged or reduced, and do not represent the actual product size.

[0022] For those skilled in the art, it is understandable that some known structures and their descriptions in the drawings may be omitted. The technical solutions of the present application will be further described below in combination with the drawings and embodiments.

[0023] Reference Figures 1 to 4 As can be seen, the present application proposes a laser pressure welding system, comprising: a rack 1, the rack 1 is provided with a laser welding head 2 capable of being connected with a laser source, the output end of the laser welding head 2 is connected with a hollow first connecting piece 11, the first connecting piece 11 is provided with a copper nozzle 12 at the end away from the laser welding head 2, and the rack 1 is further provided with a driving mechanism 14 capable of driving the copper nozzle 12 to move up and down, so that the copper nozzle 12 can be pressed on the upper surface of a workpiece.

[0024] The copper nozzle 12 is pressed on the upper surface of the workpiece by the driving mechanism 14, which can press and eliminate the gap between the parts, and realize reliable gap elimination of high rhythm processing. For the existing wire welding machine, they can only perform linear welding remotely. As one application scenario of the technical solution, it can be used when welding a white body.

[0025] As a specific example of the present application, the driving mechanism 14 is a servo motor, the approximate range of servo pressure is between 0-2000N, generally 2mm or so of workpiece can be through 1000N force completely flat, to achieve the effect of no gap. In the laser welding head 2 of the present application, according to the processing needs through the mirror drawing software to achieve two welding points at a time, the maximum distance of two welding points is 180mm, and further improve the welding efficiency.

[0026] With reference to Figure 1 and Figure 2 , the rack 1 is further provided with a pressing block 13 below the copper nozzle 12, and the driving mechanism 14 drives the copper nozzle 12 to move downward, so that the copper nozzle 12 and the pressing block 13 are respectively abutted on the upper and lower surfaces of the workpiece.

[0027] In this case, the workpiece can be pressed and compressed by the copper nozzle 12 and the pressing block 13 respectively, and further the gap between the parts is eliminated.

[0028] As a further improvement of the present application, the copper nozzle 12 and the first connecting piece 11 are provided with a hollow second connecting piece 3, the first connecting piece 11 is inserted into the second connecting piece 3, the second connecting piece 3 is provided with a first air-permeable through hole 31, and the outer side wall of the first connecting piece 11 and the inner side wall of the second connecting piece 3 have an air-permeable channel 4 in communication with the first air-permeable through hole 31.

[0029] Further, with reference to Figure 3 , the second connecting piece 3 is provided with a second air-permeable through hole 32, and a dust removal device in communication with the second air-permeable through hole 32, so that the welding fume can flow through the first air-permeable through hole 31, the air-permeable channel 4 and the second air-permeable through hole 32 to be discharged.

[0030] The first air-permeable through hole 31, the air-permeable channel 4 and the second air-permeable through hole 32 form a special air duct design, so that the welding fume can be discharged from the second air-permeable through hole 32 during welding. It should be noted that the dust removal device can also be communicated with the first air-permeable through hole 31. Of course, if the dust removal device is not needed, the second air-permeable through hole 32 can also be closed, as shown in Figure 3 Further, the present application also has a gun cleaning device, which comprises a steel brush capable of being inserted into the copper nozzle 12 and a pneumatic mechanism for driving the steel brush to rotate.

[0031] As a further improvement of the present application, the first air passage 31 is located above the lower edge of the first connecting piece 11, so that the first connecting piece 11, the second connecting piece 3 and the copper nozzle 12 are covered along the circumferential side of the laser path. In combination with the copper nozzle 12 and the pressing block 13 abutting on the upper and lower surfaces of the workpiece respectively, the entire laser welding process is free of laser leakage. Even if the first air passage 31 is provided, the laser cannot leak from the first air passage 31 due to the blocking of the side wall of the first connecting piece 11, thereby eliminating the need for an expensive and cumbersome laser room, greatly reducing the complexity and cost of the system.

[0032] As a further improvement of the present application, the rack 1 is provided with a slide rail and slide block assembly 5, and the laser welding head 2 is connected to the slide rail and slide block assembly 5, so that the driving mechanism 14 can drive the copper nozzle 12 to move up and down.

[0033] As a further improvement of the present application, the output end of the driving mechanism 14 is connected with a support plate 6, the support plate 6 is connected with the laser welding head 2, the support plate 6 is provided with a transition passage 61, and the copper nozzle 12 is detachably connected to the support plate 6 and communicates with the transition passage 61. In this way, when the driving mechanism 14 drives the support plate 6 to move downward, the laser welding head 2 and the copper nozzle 12 are also driven to move downward.

[0034] As a further improvement of the present application, the inner side wall of the second connecting piece 3 is provided with a slope 33 facing the air passage 4. The slope 33 provides a guiding effect.

[0035] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. Based on the above description, those skilled in the art can make other different forms of changes or modifications. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A laser pressure welding system, characterized in that, include: A frame (1) is provided on which a laser welding head (2) is connected to a laser source. The output end of the laser welding head (2) is connected to a hollow first connector (11). The first connector (11) has a copper nozzle (12) at one end away from the laser welding head (2). The frame (1) is also provided with a drive mechanism (14) that can drive the copper nozzle (12) to move up and down, so that the copper nozzle (12) can be pressed against the upper surface of the workpiece.

2. The laser pressure welding system according to claim 1, characterized in that, The frame (1) is also provided with a pressure block (13) located below the copper nozzle (12). When the driving mechanism (14) drives the copper nozzle (12) to move downward, the copper nozzle (12) and the pressure block (13) can respectively abut against the upper and lower surfaces of the workpiece.

3. The laser pressure welding system according to claim 1, characterized in that, A hollow second connector (3) is provided between the copper nozzle (12) and the first connector (11). The first connector (11) is inserted into the second connector (3). The second connector (3) is provided with a first vent hole (31). The outer side wall of the first connector (11) and the inner side wall of the second connector (3) have a venting channel (4) communicating with the first vent hole (31).

4. The laser pressure welding system according to claim 3, characterized in that, The first vent hole (31) is located above the lower edge of the first connector (11) so that the first connector (11), the second connector (3) and the copper nozzle (12) surround and cover the periphery of the laser path.

5. A laser pressure welding system according to claim 1, characterized in that, The frame (1) is provided with a slide rail slider assembly (5), and the laser welding head (2) is connected to the slide rail slider assembly (5) so that the drive mechanism (14) can drive the copper nozzle (12) to move up and down.

6. The laser pressure welding system according to claim 1, characterized in that, The output end of the drive mechanism (14) is connected to a support plate (6), the support plate (6) is connected to the laser welding head (2), the support plate (6) is provided with a transition through hole (61), and the copper nozzle (12) is detachably connected to the support plate (6) and communicates with the transition through hole (61).

7. A laser pressure welding system according to claim 3, characterized in that, The second connector (3) is provided with a second vent hole (32) and a dust removal device connected to the second vent hole (32) so that welding fumes can flow through the first vent hole (31), the vent channel (4) and the second vent hole (32) and be discharged.

8. The laser pressure welding system according to claim 1, characterized in that, The drive mechanism (14) is a servo motor.

9. A laser pressure welding system according to claim 1, characterized in that, It also includes a gun cleaning device, which includes a steel brush that can be inserted into the copper nozzle (12) and a pneumatic mechanism that can drive the steel brush to rotate.

10. A laser pressure welding system according to claim 3, characterized in that, The inner wall of the second connector (3) is provided with an inclined surface (33) facing the ventilation channel (4).

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