Laser welding system and device capable of adjusting size of collimated light spots and using method of device

Abstract

The invention discloses a laser welding system and device capable of adjusting the size of collimated light spots and a using method of the device, and belongs to the technical field of laser welding reliability. Comprising a collimation light source which is used for emitting collimation laser; the posture adjusting laser galvanometer is arranged on an output light path of the collimation light source and used for steering the collimation laser emitted by the collimation light source; the laser reflection adjusting device is arranged on an output light path of the attitude adjusting laser galvanometer and used for reflecting the collimated laser output by the attitude adjusting laser galvanometer and outputting collimated laser with different powers; and the laser adjusting device is arranged on an output light path of the laser reflection adjusting device and used for adjusting the power of the collimated laser according to different welding requirements. According to the invention, accurate distribution of laser energy, accurate adjustment of light spot size and flexible control of laser power are realized. Therefore, the problem that the special inter-board connector for the power supply has the characteristic of array span non-equal-size welding spots but cannot be welded at one time is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of laser welding reliability, and in particular relates to a laser welding system and device with adjustable collimated spot size, and a method for using the device. Background Art

[0002] At present, laser welding technology has begun to be applied in the field of electronic assembly. Laser welding has the characteristics of non-contact heating, good thermal effect, uniform beam, and continuous laser energy. The laser beam is concentrated in a small area through the optical system, and the laser beam is used to directly irradiate the welding part. The welding part absorbs light energy and converts it into heat energy, so that the temperature rises to the welding temperature, causing the solder to melt and infiltrate. After the laser heating stops, the welding part cools, the solder solidifies, and an alloy layer is formed, thereby achieving the purpose of electrical connection. The current application of laser welding technology to complete the welding of inter-board connectors is mature, but it can only be used for inter-board connector solder joints of equal size, and the welding can be completed at one time. If the inter-board connector array for power supply has non-equal span solder joints, it is necessary to adjust the position of the laser mechanism multiple times and change the output spot size to adapt to the welding requirements of different solder joints. The above laser adjustment work means that the laser output energy, spot size, and laser structure need to be adjusted continuously during the welding process, which not only disrupts the normal production rhythm, but also introduces additional positioning errors for repeated adjustments, resulting in more equipment debugging time. Summary of the invention

[0003] The purpose of the present invention is to provide a laser welding system, device and method for using the collimated spot size that can be adjusted, which can output different laser energies under the same collimated laser emission power to achieve simultaneous welding of welds with different energy requirements; and can adjust the spot size of different welds with different energy requirements through a laser adjustment device to overcome the shortcomings of the prior art.

[0004] In order to achieve the above object, the present invention provides the following technical solutions: In a first aspect, the present invention provides a laser welding system with adjustable collimated spot size, comprising: A collimated light source, which is used to emit collimated laser light; The attitude-adjusting laser galvanometer is arranged on the output optical path of the collimated light source and is used to redirect the collimated laser emitted by the collimated light source; The laser reflection adjustment device is arranged on the output optical path of the attitude adjustment laser galvanometer, and is used to reflect the collimated laser output by the attitude adjustment laser galvanometer to output collimated lasers of different powers; The laser adjustment device is arranged on the output light path of the laser reflection adjustment device and is used to adjust the power of the collimated laser according to different welding requirements.

[0005] Furthermore, the laser reflection adjustment device includes a first-level rotating beam splitter module and a second-level rotating reflector module; the first-level rotating beam splitter module is located on the output optical path of the attitude adjustment laser galvanometer, and the second-level rotating reflector module is located on the output optical path of the first-level rotating beam splitter module; the first-level rotating beam splitter module reflects a part of the collimated laser output by the attitude adjustment laser galvanometer to the second-level rotating reflector module, and reflects the other part to the laser adjustment device.

[0006] Further, the laser adjustment device includes a first plano-concave lens moving module and a second plano-concave lens moving module; The first plano-concave lens moving module is arranged on the output optical path of the first-stage rotating beam splitter module, and the first plano-convex lens module is coaxially arranged on the output optical path of the first plano-concave lens moving module; the first plano-concave lens moving module is used to receive the collimated laser reflected by the first-stage rotating beam splitter module and adjust the power of the collimated laser with the first plano-convex lens module; The second plano-concave lens moving module is arranged on the output light path of the secondary rotating reflector module and a second plano-convex lens module is coaxially arranged on the output light path of the second plano-concave lens moving module; the second plano-concave lens moving module is used to receive the collimated laser reflected by the secondary rotating reflector module and adjust the power of the collimated laser with the second plano-convex lens module.

[0007] In a second aspect, the present invention provides a laser welding device with adjustable collimated spot size, comprising: A collimated light source, which is used to emit collimated laser light; The attitude-adjusting laser galvanometer is arranged on the output optical path of the collimated light source and is used to redirect the collimated laser emitted by the collimated light source; The laser reflection adjustment device is arranged on the output optical path of the attitude adjustment laser galvanometer, and is used to reflect the collimated laser output by the attitude adjustment laser galvanometer to output collimated lasers of different powers; The laser adjustment device is arranged on the output optical path of the laser reflection adjustment device, and is used to adjust the power of the collimated laser according to different welding requirements to form the required spot size.

[0008] Further, the laser reflection adjustment device includes a primary rotating beam splitter module and a secondary rotating reflector module; the primary rotating beam splitter module includes a plurality of beam splitters with different reflectivities and a frame, and the plurality of beam splitters are arranged on the surface of the frame in the form of an arc array, the primary rotating beam splitter module is provided with a window at a radially opposite position of the frame, and an inner circle dividing plate is provided at the upper end of the frame; the gear position of the primary rotating beam splitter module is rotated and adjusted along the axial direction, and the beam splitter transmits the laser incident from the posture adjustment laser galvanometer to the secondary rotating reflector module through the window in the radial direction; The secondary rotating reflector module includes a plurality of reflectors with different reflectivities and a shell; the shell is sleeved on the periphery of the frame, an outer ring dividing plate is arranged on the upper end of the shell, the shell and the frame are coaxially rotatably connected, and a plurality of reflectors are arranged in the form of an arc array on the inner surface of the shell on the same side of the window.

[0009] Furthermore, the laser adjustment device includes a first plano-concave lens module moving cavity and a second plano-concave lens module moving cavity, the first plano-concave lens module moving cavity is fixedly connected with a first laser range enlargement cavity below, and the first laser range enlargement cavity is fixedly connected with a first plano-convex lens module bearing cavity below; the second plano-concave lens module moving cavity is fixedly connected with a second laser range enlargement cavity below, and the second laser range enlargement cavity is fixedly connected with a second plano-convex lens module bearing cavity below.

[0010] Furthermore, a first plano-concave lens moving module is detachably provided in the moving cavity of the first plano-concave lens module, and a second plano-concave lens moving module is detachably provided in the moving cavity of the second plano-concave lens module; both the first plano-concave lens moving module and the second plano-concave lens moving module are driven by a motor to move in the corresponding moving cavity; a first plano-convex lens module is fixed in the bearing cavity of the first plano-convex lens module, and a second plano-convex lens module is fixed in the bearing cavity of the second plano-convex lens module.

[0011] Furthermore, the inner ring dividing plate is engraved with a gear position mark, and the outer ring dividing plate is engraved with a gear position mark.

[0012] Furthermore, the inner ring indexing plate and the outer ring indexing plate are connected by a rotating ratchet to achieve coaxial limited indexing rotation.

[0013] In a third aspect, the present invention provides a method for using a laser welding device with an adjustable collimated spot size, comprising the following steps: Step 1: According to the welding requirements of the first welding point, rotate the first-level rotating beam splitter module to reach the beam splitter with the reflectivity required for welding; Step 2: The first plano-concave lens moving module moves up and down along the first plano-concave lens module moving cavity to a position where the welding spot size required for the first welding point can be formed; Step 3: According to the welding requirements of the second welding point, the secondary rotating reflector module is rotated to a reflector with a reflectivity that meets the welding requirements; Step 4: The second plano-concave lens moving module moves up and down along the second plano-concave lens module moving cavity to a position where the welding spot size required for the second welding point can be formed; Step 5: Start the collimated light source and weld the first and second welding points; Step 6: Repeat steps 1 to 4 until all the welding points are completed.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a laser welding system with adjustable collimated spot size. A collimated light source emits collimated laser. A posture-adjusting laser galvanometer is arranged on the collimated light path to steer the collimated laser. The collimated laser output by the posture-adjusting laser galvanometer is reflected by a laser reflection adjustment device to output collimated lasers of different powers, so as to realize simultaneous welding of welds with different energy requirements. The laser adjustment device is used to adjust the power of the collimated laser for different welding requirements, so as to realize adjustment of the spot size under different energy requirements of different welds. Through the combined effects of the posture-adjusting laser galvanometer, the laser reflection adjustment device and the laser adjustment device, it is possible to realize precise distribution of laser energy, accurate adjustment of the spot size and flexible control of the laser power. This solves the problem that the power supply dedicated inter-board connector has the characteristics of unequally large array span welds, but cannot be welded at one time.

[0015] The present invention provides a laser welding device with adjustable collimated spot size, comprising a collimated light source, a posture-adjustable laser galvanometer, a laser reflection adjustment device and a laser adjustment device, which can adapt to a variety of different welding requirements; Specifically, it includes a first plano-concave lens module moving cavity and a second plano-concave lens module moving cavity, and the first plano-concave lens moving module and the second plano-concave lens moving module therein. Since the first plano-concave lens module moving cavity and the second plano-concave lens module moving cavity can drive the plano-concave lens moving module therein to move in the cavity through a motor, and they work together with the first plano-convex lens module and the second plano-convex lens module respectively, the propagation characteristics of the light can be changed, thereby realizing precise adjustment of the spot size.

[0016] The primary rotating beam splitter module adopted by the present invention includes a plurality of beam splitters with different reflectivities arranged on the surface of a frame in the form of an arc array, and the inner ring dividing disk at the upper end of the frame is engraved with a gear mark, which can be rotated and adjusted along the axial direction. The operator can select a beam splitter with a suitable reflectivity by rotating the inner ring dividing disk according to different welding power requirements, and the beam splitter transmits the laser injected by the posture adjustment laser galvanometer to the secondary rotating reflector module through an opening in the radial direction; the plurality of reflectors with different reflectivities in the secondary rotating reflector module are arranged on the inner surface of the shell in the form of an arc array, and the shell and the frame of the primary rotating beam splitter module are coaxially rotatably connected, and an outer ring dividing disk is provided at the upper end of the shell, which is also engraved with a gear mark; according to different welding conditions, a suitable reflector can be selected by rotating the outer ring dividing disk, and the reflection of the laser transmitted from the primary rotating beam splitter module can be further adjusted; this design allows flexible distribution and reflection adjustment of laser energy, and beam splitters with different reflectivities can be selected according to welding requirements to achieve laser output of different powers, so that the device can cope with welding tasks with different power requirements.

[0017] Specifically, the modular design of the device can be equipped with a rotating reflector module and the number of rotating reflector modules can be increased according to actual welding requirements to achieve batch adjustment of different spot size requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of a laser welding system with adjustable collimated spot size in an embodiment of the present invention.

[0019] Figure 2 The figure is a schematic diagram of a laser welding device with adjustable collimated spot size in an embodiment of the present invention.

[0020] Figure 3 It is a half-section schematic diagram of a laser welding device with adjustable collimated spot size in an embodiment of the present invention.

[0021] Figure 4 Schematic diagram of a top view of a laser reflection adjustment device in an embodiment of the present invention.

[0022] Figure 5 It is a bottom view schematically showing the laser reflection adjustment device in an embodiment of the present invention.

[0023] Figure 6 Schematic diagram of a laser welding system that meets three different welding point requirements in an embodiment of the present invention.

[0024] In the figure, 1. collimated light source; 2. primary rotating beam splitter module; 2-1. beam splitter; 3. first plano-concave lens moving module; 4. first plano-convex lens module; 5. second plano-convex lens module; 6. second plano-concave lens moving module; 7. secondary rotating reflector module; 7-1. reflector; 8. attitude-adjusting laser galvanometer; 9. outer shell; 10-1. first plano-concave lens module moving cavity; 10-2. second plano-concave lens module moving cavity; 11-1. first laser range enlargement cavity; 11-2. second laser range enlargement cavity; 12-1. first plano-convex lens module bearing cavity; 12-2. second plano-convex lens module bearing cavity; 13. frame; 14. window; 15. outer ring dividing plate; 16. inner ring dividing plate. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] Example 1 See also Figure 1 The present invention provides a laser welding system with adjustable collimated spot size, comprising: Collimated light source, which is used to emit collimated laser and provide the initial laser source for the whole system; The attitude-adjusting laser galvanometer is arranged on the output optical path of the collimated light source and is used to steer the collimated laser emitted by the collimated light source; the steering angle of the attitude-adjusting laser galvanometer can be calibrated and fine-tuned, and the angle can also be deflected according to needs; the collimated laser enters the attitude-adjusting laser galvanometer, and the collimated laser is steered through the angle adjustment function of the attitude-adjusting laser galvanometer, so that the collimated laser can be transmitted according to the preset direction and angle; The laser reflection adjustment device is arranged on the output optical path of the attitude adjustment laser galvanometer, and is used to reflect the collimated laser output by the attitude adjustment laser galvanometer to output collimated lasers of different powers; For example, the laser reflection adjustment device includes a primary rotating beam splitter module and a secondary rotating reflector module, which can adjust the transmission path and power distribution of the laser; the primary rotating beam splitter module is located on the output optical path of the attitude adjustment laser galvanometer, and the secondary rotating reflector module is located on the output optical path of the primary rotating beam splitter module; the primary rotating beam splitter module reflects a part of the collimated laser output by the attitude adjustment laser galvanometer to the secondary rotating reflector module, and the other part is reflected to the laser adjustment device; The laser adjustment device is arranged on the output optical path of the laser reflection adjustment device, and is used to adjust the power of the collimated laser according to different welding requirements; the power of the collimated laser can be accurately adjusted according to different welding requirements.

[0028] The laser adjustment device includes a first plano-concave lens moving module and a second plano-concave lens moving module; For example, a first plano-concave lens moving module is arranged on the output light path of the first-stage rotating beam splitter module, and a first plano-convex lens module is coaxially arranged on the output light path of the first plano-concave lens moving module; the first plano-concave lens moving module is used to receive the collimated laser reflected by the first-stage rotating beam splitter module and adjust the power of the collimated laser with the first plano-convex lens module; The second plano-concave lens moving module is arranged on the output optical path of the secondary rotating reflector module, and the second plano-convex lens module is coaxially arranged on the output optical path of the second plano-concave lens moving module; the second plano-concave lens moving module is used to receive the collimated laser reflected by the secondary rotating reflector module and adjust the power of the collimated laser with the second plano-convex lens module. The first plano-concave lens moving module and the second plano-concave lens moving module cooperate with the first plano-convex lens module and the second plano-convex lens module respectively, and adjust the power of the collimated laser on different paths by adjusting the relative position or spacing between the lenses, so that the system can adjust the spot size under different energy requirements of different welding points.

[0029] Example 2 See also Figures 2 to 5 The present invention provides a laser welding device with adjustable collimated spot size, which uses the above-mentioned laser welding optical path system with adjustable collimated spot size, including: A collimated light source 1, the collimated light source 1 is used to emit collimated laser; The attitude adjustment laser galvanometer 8 is arranged on the output light path of the collimated light source 1 and is used to redirect the collimated laser emitted by the collimated light source 1; The laser reflection adjustment device is arranged on the output optical path of the attitude adjustment laser galvanometer 8, and is used to reflect the collimated laser output by the attitude adjustment laser galvanometer 8 to output collimated lasers of different powers; For example, the laser reflection adjustment device includes a primary rotating beam splitter module 2 and a secondary rotating reflector module 7. The primary rotating beam splitter module 2 is located below the posture adjustment laser galvanometer 8. The primary rotating beam splitter module 2 includes a plurality of beam splitters 2-1, and the reflectivities of these beam splitters 2-1 are different; Figure 4 As shown, five beam splitters 2-1 with different reflectivities are bonded and arranged in the form of an arc array on the surface of the frame 13, and a window 14 is provided on the radially opposite position of the frame 13 of the first-stage rotating beam splitter module 2; an inner ring dividing plate 14 is riveted on the upper end of the frame 13, and a gear position mark is engraved on the inner ring dividing plate 14, so that the first-stage rotating beam splitter module 2 can be rotated and adjusted along the axial direction according to the required gear position; the five beam splitters 2-1 with different reflectivities arranged on the first-stage rotating beam splitter module 2 can transmit the collimated laser injected by the attitude adjustment laser galvanometer 8 to the second-stage rotating reflector module 7 along the radial direction through the window 14 on the frame 13.

[0030] The secondary rotating reflector module 7 includes a plurality of reflectors 7-1 with different reflectivities and a shell 9; the shell 9 is sleeved on the periphery of the frame 13, an outer ring dividing plate 15 is provided on the upper end of the shell 9, the shell 9 and the frame 13 are coaxially rotatably connected, and a plurality of reflectors 7-1 are arranged in the form of an arc array on the inner surface of the shell 9 on the same side of the window 14.

[0031] like Figure 5 As shown, the shell 9 of the secondary rotating mirror module 7 is sleeved on the outer periphery of the frame 9, and the secondary rotating mirror module 7 includes five reflectors 7-1 with different reflectivities. An outer ring dividing plate 15 is riveted to the upper end of the shell 9 and a gear position mark is engraved on the outer ring dividing plate 15. The outer ring dividing plate 15 is connected to the inner ring dividing plate 16 through a rotating ratchet to realize coaxial limited indexing rotation.

[0032] The equipment operator can select the gear position of the inner ring dividing disk 14 on the first-level rotating beam splitter module 2 according to the different laser welding powers required for different welding points, so that the beam splitter 2-1 with the required reflectivity is coaxial with the collimated laser transmitted by the attitude adjustment laser galvanometer 8. One of the beam splitters 2-1 on the selected first-level rotating beam splitter module 2 reflects a part of the collimated laser through the window 14 to the second-level rotating reflector module 7, and reflects the other part to the laser adjustment device.

[0033] The laser adjustment device is arranged on the output optical path of the laser reflection adjustment device, and is used to adjust the power of the collimated laser according to different welding requirements to form the required spot size; For example, the laser adjustment device includes a first plano-concave lens module moving cavity 10-1 and a second plano-concave lens module moving cavity 10-2, a first laser range amplification cavity 11-1 is fixedly connected below the first plano-concave lens module moving cavity 10-1, and a first plano-convex lens module bearing cavity 12-1 is fixedly connected below the first laser range amplification cavity 11-1; a first plano-concave lens moving module 3 is detachably arranged in the first plano-concave lens module moving cavity 10-1, and the first plano-concave lens moving module 3 can be moved up and down in the first plano-concave lens module moving cavity 10-1 by a motor, and the first plano-convex lens module A first plano-convex lens module 4 is fixed in the group bearing cavity 12-1; a second laser range enlargement cavity 11-2 is fixedly connected to the lower part of the second plano-concave lens module movable cavity 10-2, a second plano-convex lens module bearing cavity 12-2 is fixedly connected to the lower part of the second laser range enlargement cavity 11-2, a second plano-concave lens movable module 6 is detachably arranged in the second plano-concave lens module movable cavity 10-2, the second plano-concave lens movable module 6 can be moved up and down in the second plano-concave lens module movable cavity 10-2 by a motor, and a second plano-convex lens module 5 is fixed in the second plano-convex lens module bearing cavity 12-2.

[0034] The collimated laser reflected by the first-stage rotating beam splitter module 2 to the laser adjustment device is received by the first plano-concave lens module movable cavity 10-1. When the collimated laser enters the first plano-concave lens module movable cavity 10-1, the motor drives the first plano-concave lens movable module 3 to move up and down in the first plano-concave lens module movable cavity 10-1, and the relative distance between the first plano-concave lens movable module 3 and the first plano-convex lens module 4 changes. Combined with the first laser range amplification cavity 11-1, it is amplified into scattered laser, and then converges into the parallel laser required for the welding point again through the second plano-convex lens module 4, thereby changing the power and spot size of the collimated laser of this line.

[0035] The collimated laser reflected by the primary rotating beam splitter module 2 to the secondary rotating reflector module 7 is received by the second plano-concave lens module moving cavity 10-2. When the collimated laser enters the second plano-concave lens module moving cavity 10-2, the motor drives the second plano-concave lens moving module 6 to move up and down in the second plano-concave lens module moving cavity 10-2. The relative distance between the second plano-concave lens moving module 6 and the second plano-convex lens module 5 changes, and is amplified into scattered laser light in combination with the second laser range amplification cavity 11-2. After passing through the second plano-convex lens module 5, it converges again into the parallel laser light required for the welding point, thereby changing the power and spot size of the collimated laser light of the line. Thus, the laser adjustment device outputs two different laser energies.

[0036] Specifically, during daily maintenance, the first plano-convex lens module 4 and the second plano-convex lens module 5 can be removed from the first plano-convex lens module bearing cavity 12-1 and the second plano-convex lens module bearing cavity 12-2, and the excess dust that has penetrated into the first laser range amplification cavity 11-1 and the second laser range amplification cavity 11-2 can be cleaned. See also Figure 6 In some preferred embodiments of the present invention, if there are future design requirements for three or more welds of different sizes and different energy requirements that require laser welding, the secondary rotating reflector module is changed to a secondary rotating beam splitter module on the basis of the present invention, and a tertiary rotating reflector module is added, still in the arc-window-coaxial arrangement. Take three welds of different sizes and different energy requirements as an example. The primary rotating beam splitter module divides the incident laser into two paths. The first path transmits the laser, and completes the welding of the first group of welds through the moving cavity of the plano-concave lens module and the laser range amplification cavity; the second path reflects the laser and enters the secondary rotating beam splitter module.

[0037] The secondary rotating beam splitter module can divide the incident laser into two paths. The first path is the transmitted laser, which completes the welding of the second group of welding points through the moving cavity of the plano-concave lens module and the laser range amplification cavity; the second path is the reflected laser that enters the tertiary rotating reflector module.

[0038] The three-stage rotating reflector module transfers the incident laser through the plano-concave lens module moving cavity and the laser range amplification cavity to complete the welding of the third group of welding points. After that, the structural iteration is carried out, and the output power of the collimated laser is increased in time to meet the welding needs of more non-uniform welding points.

[0039] Example 3 The present invention provides a method for using a laser welding device with adjustable collimated spot size, comprising the following steps: Step 1: According to the welding requirements of the first welding point, rotate the first-level rotating beam splitter module to reach the beam splitter with the reflectivity required for welding; Step 2: The first plano-concave lens moving module moves up and down along the first plano-concave lens module moving cavity to a position where the welding spot size required for the first welding point can be formed; Step 3: According to the welding requirements of the second welding point, the secondary rotating reflector module is rotated to a reflector with a reflectivity that meets the welding requirements; Step 4: The second plano-concave lens moving module moves up and down along the second plano-concave lens module moving cavity to a position where the welding spot size required for the second welding point can be formed; Step 5: Start the collimated light source and weld the first and second welding points. Step 6: Repeat steps 1 to 4 until all the welding points are completed.

[0040] For example, a laser welding device with adjustable collimated spot size according to the present invention is loaded on a certain type of laser welding equipment with a gantry motion mechanism, the collimated light source 1 of the present invention is docked with the laser generator of the laser welding equipment, the housing 9 is connected to the rotation angle controller of the laser welding equipment, the first plano-concave lens moving module 3 and the second plano-concave lens moving module 6 are respectively connected to the displacement controller of the laser welding equipment in the first plano-concave lens module moving cavity 10-1 and the second plano-concave lens module moving cavity 10-2, the power supply dedicated inter-board connector waiting for welding is placed on the guide rail of the equipment, the industry-common CCD recognition MARK technology is used to complete the alignment, and the programming of the array non-uniform welding point welding parameters is completed according to industry experience: spot size, laser power requirement.

[0041] Step 1: According to the process requirements of the welding point of the product A to be welded: spot size, laser power, the first-level rotating beam splitter module 2 responds to the command of the equipment rotation angle controller and rotates to the beam splitter 2-1 with the reflectivity required by the process; Step 2: The first plano-concave lens moving module 3 responds to the instruction of the device displacement controller and moves along the first plano-concave lens module moving cavity 10-1 to a position where the A welding point can form the required spot size; Step 3: According to the process requirements of the welding point of the product B to be welded: spot size, laser power, the secondary rotating reflector module 7 responds to the command of the equipment rotation angle controller and rotates to the reflector 7-1 with the reflectivity required by the process; Step 4: The second plano-concave lens moving module 6 responds to the instruction of the device displacement controller and moves along the second plano-concave lens module moving cavity 10-2 to a position where the B welding point has the required spot size; Among them, steps one, two, three and four are automatically executed in parallel by the process parameter-driven equipment controller in actual production.

[0042] Step 5: The laser generator of the laser welding equipment is started to weld the welding points A and B; It should be noted that when the collimated laser is incident on the collimated light source 1 for the first time, the laser collimation is calibrated by the attitude-adjusting laser galvanometer 8 . If the collimated laser is not incident on the collimated light source 1 for the first time, there is no need to adjust the attitude-adjusting laser galvanometer 8 .

[0043] Step 6: Repeat steps 1 to 4 to complete the welding of the non-uniform solder joints of the typical power connector array.

[0044] Specific process in the production link: The collimated light source 1 outputs a collimated laser of a certain power, and the collimated laser is divided into two paths at the primary rotating beam splitter module 2. The first path transmits the primary rotating beam splitter module 2, and the parallel laser passes through the first plano-concave lens moving module 3, is amplified into scattered laser in the first laser range amplification cavity 11-1, and then converges again into the parallel laser required for the A welding point through the first plano-convex lens module 4, and its coverage range is the spot size required for the A welding point. The second path is reflected from the primary rotating beam splitter module 2, and the parallel laser is reflected to the secondary rotating reflector module 7 through the window 14, and then passes through the reflector 7-1 on it that is parallel to the primary rotating beam splitter module 2, and the parallel laser is incident on the second plano-concave lens moving module 6, and is amplified into scattered laser in the second laser range amplification cavity 11-2, and then converges again into the parallel laser required for the B welding point through the second plano-convex lens module 5, and its coverage range is the spot size required for the B welding point.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A laser welding system with adjustable collimated spot size, characterized in that: include: A collimated light source, which is used to emit collimated laser light; The attitude-adjusting laser galvanometer is arranged on the output optical path of the collimated light source and is used to redirect the collimated laser emitted by the collimated light source; The laser reflection adjustment device is arranged on the output optical path of the attitude adjustment laser galvanometer, and is used to reflect the collimated laser output by the attitude adjustment laser galvanometer to output collimated lasers of different powers; The laser adjustment device is arranged on the output light path of the laser reflection adjustment device and is used to adjust the power of the collimated laser according to different welding requirements.

2. The laser welding system with adjustable collimated spot size according to claim 1, characterized in that: The laser reflection adjustment device includes a primary rotating beam splitter module and a secondary rotating reflector module; the primary rotating beam splitter module is located on the output optical path of the attitude adjustment laser galvanometer, and the secondary rotating reflector module is located on the output optical path of the primary rotating beam splitter module; the primary rotating beam splitter module reflects a part of the collimated laser output by the attitude adjustment laser galvanometer to the secondary rotating reflector module, and reflects the other part to the laser adjustment device.

3. The laser welding system with adjustable collimated spot size according to claim 1, characterized in that: The laser adjustment device comprises a first plano-concave lens moving module and a second plano-concave lens moving module; The first plano-concave lens moving module is arranged on the output optical path of the first-stage rotating beam splitter module, and the first plano-convex lens module is coaxially arranged on the output optical path of the first plano-concave lens moving module; the first plano-concave lens moving module is used to receive the collimated laser reflected by the first-stage rotating beam splitter module and adjust the power of the collimated laser with the first plano-convex lens module; The second plano-concave lens moving module is arranged on the output light path of the secondary rotating reflector module, and a second plano-convex lens module is coaxially arranged on the output light path of the second plano-concave lens moving module; The second plano-concave lens moving module is used to receive the collimated laser reflected by the secondary rotating reflector module and to adjust the power of the collimated laser with the second plano-convex lens module.

4. A laser welding device with adjustable collimated spot size, characterized in that: The laser welding optical path system with adjustable collimated spot size as described in any one of claims 1 to 3 comprises: A collimated light source (1), the collimated light source (1) is used to emit collimated laser light; An attitude-adjusting laser galvanometer (8) is arranged on an output light path of the collimated light source (1) and is used to deflect the collimated laser light emitted by the collimated light source (1); A laser reflection adjustment device is arranged on the output light path of the attitude adjustment laser galvanometer (8) and is used to reflect the collimated laser output by the attitude adjustment laser galvanometer (8) to output collimated lasers of different powers; The laser adjustment device is arranged on the output optical path of the laser reflection adjustment device, and is used to adjust the power of the collimated laser according to different welding requirements to form the required spot size.

5. The laser welding device with adjustable collimated spot size according to claim 4, characterized in that: The laser reflection adjustment device comprises a primary rotating beam splitter module (2) and a secondary rotating reflector module (7); the primary rotating beam splitter module (2) comprises a plurality of beam splitters (2-1) with different reflectivities and a frame (13), and the plurality of beam splitters (2-1) are arranged on the surface of the frame (13) in the form of an arc array, the primary rotating beam splitter module (2) is provided with a window (14) at a radially opposite position of the frame (13), and an inner ring dividing plate (14) is provided at the upper end of the frame (13); the gear position of the primary rotating beam splitter module (2) is rotated and adjusted along the axial direction, and the beam splitter (2-1) transmits the laser light emitted by the posture adjustment laser galvanometer (8) to the secondary rotating reflector module (7) through the window (14) in the radial direction; The secondary rotating reflector module (7) comprises a plurality of reflectors (7-1) with different reflectivities and a housing (9); the housing (9) is sleeved on the periphery of a frame (13); an outer ring indexing plate (15) is provided at the upper end of the housing (9); the housing (9) and the frame (13) are coaxially rotatably connected; and the plurality of reflectors (7-1) are arranged in the form of an arc array on the inner surface of the housing (9) on the same side of the window (14).

6. The laser welding device with adjustable collimated spot size according to claim 5, characterized in that: The laser adjustment device comprises a first plano-concave lens module moving cavity (10-1) and a second plano-concave lens module moving cavity (10-2); a first laser range amplification cavity (11-1) is fixedly connected below the first plano-concave lens module moving cavity (10-1); a first plano-convex lens module bearing cavity (12-1) is fixedly connected below the first laser range amplification cavity (11-1); a second laser range amplification cavity (11-2) is fixedly connected below the second plano-concave lens module moving cavity (10-2); a second plano-convex lens module bearing cavity (12-2) is fixedly connected below the second laser range amplification cavity (11-2).

7. The laser welding device with adjustable collimated spot size according to claim 5, characterized in that: A first plano-concave lens moving module (3) is detachably arranged in the first plano-concave lens module moving cavity (10-1), and a second plano-concave lens moving module (6) is detachably arranged in the second plano-concave lens module moving cavity (10-2); both the first plano-concave lens moving module (3) and the second plano-concave lens moving module (6) are driven by a motor to move in the corresponding moving cavity; a first plano-convex lens module (4) is fixed in the first plano-convex lens module bearing cavity (12-1), and a second plano-convex lens module (5) is fixed in the second plano-convex lens module bearing cavity (12-2).

8. The laser welding device with adjustable collimated spot size according to claim 5, characterized in that: The inner ring dividing plate (16) is engraved with a gear position mark, and the outer ring dividing plate (15) is engraved with a gear position mark.

9. The laser welding device with adjustable collimated spot size according to claim 5, characterized in that: The inner ring indexing disc (16) and the outer ring indexing disc (15) are connected via a rotating ratchet to achieve coaxial limited indexing rotation.

10. A method for using the laser welding device with adjustable collimated spot size as claimed in any one of claims 4 to 9, characterized in that: The following steps are involved: Step 1: according to the welding requirements of the first welding point, the first-stage rotating beam splitter module (2) is rotated until the beam splitter (2-1) reaches the reflectivity required for welding; Step 2: the first plano-concave lens moving module (3) moves up and down along the first plano-concave lens module moving cavity (10-1) to a position where a welding spot size required for forming the first welding point to be welded can be formed; Step 3: according to the welding requirements of the second welding point, the secondary rotating reflector module (7) is rotated until the reflector (7-1) reaches the reflectivity required for welding; Step 4: the second plano-concave lens moving module (6) moves up and down along the second plano-concave lens module moving cavity (10-2) to a position where a welding spot size required for forming the second welding point to be welded can be formed; Step 5: The collimated light source (1) is started to weld the first and second welding points; Step 6: Repeat steps 1 to 4 until all the welding points are completed.

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