A cutting and welding device and method for coaxial optical path of material strip

Abstract

The present invention discloses a cutting and welding device and method for a material strip with a coaxial optical path, comprising a welding laser, a welding collimator arranged along the optical path of the welding laser; a cutting laser, a cutting collimator arranged along the optical path of the cutting laser; a conversion mechanism for switching between cutting and welding functions; a laser galvanometer for adjusting the position and motion trajectory of the laser spots output by the welding collimator and the cutting collimator; a beam combiner for combining the welding laser beam output by the welding collimator and the cutting laser beam output by the cutting collimator, and a focusing mirror for focusing the combined laser beam output by the beam combiner; the cutting laser beam output by the cutting collimator is coaxially output with the welding laser beam output by the welding collimator via the conversion mechanism. The present invention utilizes instantaneous high-temperature fusion technology to achieve short welding and repair times, low heat generation, and is capable of welding copper, stainless steel, or most metal alloys with a thickness of 0.05 mm or greater.

Description

Technical Field

[0001] The present invention relates to the technical field of laser cutting and welding, and in particular to a cutting and welding device and method for a material strip with a coaxial optical path. Background Art

[0002] During the connector processing process, a stamping die is needed to stamp the connector terminals. In order to speed up production efficiency and achieve mass production, the die is usually designed to be able to adapt to the structure of the assembly line. At the same time, the connector is designed in the form of a material strip. When the material strip passes through the die, a connector terminal can be formed in one stamping.

[0003] In the existing technology, since the connector has multiple terminal parts and component forming parts, the same position requires multiple stamping and cutting forming, or different positions require different stamping and cutting forming. Therefore, multiple product workshops and production lines need to be designed in production. When replacing the material reel, manual re-threading is required and the production equipment needs to be shut down, which seriously affects efficiency and production capacity. A large amount of discarded material strips also appear in the entire connector manufacturing process, causing serious waste. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology and provide a material strip cutting and welding device and method using a coaxial optical path, which can cut and weld the material strip through a coaxial optical path, and during the forming process of the material strip, there is no need to replace the production equipment, and the production equipment does not need to be shut down. At the same time, there is no need for manual re-threading, and discarded material strips can be spliced ​​and reused, thereby improving production efficiency and reducing material strip waste.

[0005] To achieve this purpose, the present invention designs a cutting and welding device with a coaxial optical path for a material strip, comprising a welding laser, a welding collimator arranged along the optical path of the welding laser; a cutting laser, a cutting collimator arranged along the optical path of the cutting laser; a conversion mechanism for converting cutting and welding functions; a laser galvanometer for adjusting the position and motion trajectory of the laser spots output by the welding collimator and the cutting collimator; a beam combiner for combining the welding laser beam output by the welding collimator and the cutting laser beam output by the cutting collimator, and a focusing mirror for focusing the combined laser output by the beam combiner; the cutting laser beam output by the cutting collimator is output coaxially with the welding laser beam output by the welding collimator through the conversion mechanism.

[0006] Furthermore, a coaxial image acquisition device and a temperature sensor are respectively provided on the optical path of the welding laser beam output by the welding collimator and the combined optical path of the welding laser beam output by the welding collimator and the cutting laser beam output by the cutting collimator.

[0007] Furthermore, at least one first beam splitter is arranged on the optical path of the welding laser beam output by the welding collimator, and at least one second beam splitter is arranged on the combined optical path of the welding laser beam output by the welding collimator and the cutting laser beam output by the cutting collimator, and the first beam splitter and the second beam splitter are both arranged at 45° to their respective optical paths.

[0008] Furthermore, the conversion mechanism includes a reflector arranged at 45° to the cutting laser beam output by the cutting collimator and a driving mechanism for driving the reflector to move back and forth so that the reflector enters or exits the optical path of the cutting laser beam output by the cutting collimator.

[0009] Furthermore, the reflector is arranged at the intersection of the optical path of the welding laser beam output by the welding collimator and the optical path of the cutting laser beam output by the cutting collimator.

[0010] Furthermore, the driving mechanism includes a cylinder.

[0011] Furthermore, a method for cutting and welding the coaxial optical path of the material strip is provided: the left and right material strips are fixed on the left and right fixtures respectively, the position of the left fixture is adjusted to the left cutting position, the cutting laser parameters are set, and the cutting laser is used to cut the left material strip; the position of the right fixture is adjusted to the right cutting position, the cutting laser parameters are set, and the cutting laser is used to cut the right material strip; the positions of the left and right fixtures are adjusted to the splicing position, the cutting laser is switched to the welding laser, the welding laser parameters are set, and the welding laser is used to laser splice the left and right material strips.

[0012] Furthermore, the method of adjusting the position of the left jig to the left cutting position is: adjusting the plane position and height of the left jig so that the spot of the cutting laser is located at the starting cutting position of the left material strip and the spot size of the cutting laser is 100-700um; the method of adjusting the position of the right jig to the right cutting position is: adjusting the plane position and height of the right jig so that the spot of the cutting laser is located at the starting cutting position of the right material strip and the spot size of the cutting laser is 100-700um.

[0013] Furthermore, the setting of the cutting laser parameters includes setting the speed of the cutting laser to 1-500 mm / s.

[0014] Furthermore, setting the welding laser parameters includes setting the speed of the welding laser to 30-200 mm / s.

[0015] The beneficial effects of the present invention are as follows: the present invention combines laser with welding machine, and through instant high-temperature fusion technology, it has the functions of short welding and repairing time, low heat generation, and the ability to weld copper or stainless steel or most metal alloy materials with a thickness of more than 0.05mm, and has reliable scalability of welding process. The modular integrated welding and cutting jig can quickly switch welding for different products, and is suitable for welding and cutting of terminal strips in the fields of stamping, electroplating, secondary molding, secondary stamping and automatic assembly. The production line only needs to manually complete the replacement of the strip reel and insert the strip head of the replaced strip reel into the inlet of the material channel. There is no need for manual re-threading and shutdown of the production equipment, which solves the problem of troublesome operation of manual replacement of the strip reel. The discarded strips can also be spliced ​​for reuse, which greatly improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the device connection in the present invention;

[0017] Figure 2 Schematic diagram of the structure of the conversion mechanism in the present invention;

[0018] Among them, 101 is a welding laser, 102 is a welding collimator, 103 is a coaxial image acquisition device, 104 is a reflector, 105 is a second beam splitter, 106 is a temperature sensor, 107 is a laser galvanometer, 108 is a first beam splitter, 109 is a cutting laser, 110 is a cylinder, 111 is a cutting collimator, 112 is a beam combiner, 113 is a focusing lens, 114 is a left fixture, 115 is a right fixture, 116 is a left movable platform, and 117 is a right movable platform. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1The cutting and welding device with a coaxial optical path of the material strip shown includes a welding laser 101, a welding collimator 102 arranged along the optical path of the welding laser 101; a cutting laser 109, a cutting collimator 111 arranged along the optical path of the cutting laser 109; a conversion mechanism for converting cutting and welding functions; a laser galvanometer 107 for adjusting the position and motion trajectory of the laser spots output by the welding collimator 102 and the cutting collimator 111; a beam combining mirror 112 for combining the welding laser beam output by the welding collimator 102 and the cutting laser beam output by the cutting collimator 111, and a focusing mirror 113 for focusing the combined laser beam output by the beam combining mirror 112; the cutting laser beam output by the cutting collimator 111 is output coaxially with the welding laser beam output by the welding collimator 102 through the conversion mechanism. A coaxial image acquisition device 103 and a temperature sensor 106 are respectively provided on the optical path of the welding laser beam output by the welding collimator 102 and the optical path of the combined beam of the welding laser beam output by the welding collimator 102 and the cutting laser beam output by the cutting collimator 111. A first beam splitter 108 is provided on the optical path of the welding laser beam output by the welding collimator 102, and a second beam splitter 105 is provided on the optical path of the combined beam of the welding laser beam output by the welding collimator 102 and the cutting laser beam output by the cutting collimator 111. Both the first beam splitter 108 and the second beam splitter 105 are arranged at 45 degrees to their respective optical paths.

[0021] like Figure 2 As shown, the conversion mechanism includes a reflector 104 arranged at a 45° angle to the cutting laser beam output by the cutting collimator 111, and a cylinder 110 for driving the reflector 104 to move back and forth, so that the reflector 104 enters or exits the output of the cutting collimator 111. The reflector 104 is arranged at the intersection of the optical path of the welding laser beam output by the welding collimator 102 and the optical path of the cutting laser beam output by the cutting collimator 111.

[0022] In the present invention, welding laser 101 is a QCW fiber laser: a fiber laser with a peak energy of 800-1200 nm, an average power of 50-300 W, a peak power greater than 10 kW, a peak power of 50-3000 W, a maximum single pulse energy of 5-30 J, a beam quality M2 factor of 1.3 or less, and a pulse width of 1-30 ms. The output fiber core diameter is 200-800 μM, and the numerical aperture is 0.15-0.23.

[0023] The cutting laser 109 is a MOPA fiber laser: a fiber laser with peak energy, a wavelength of 800-1200nM, an average power of 50-300W, a peak power greater than 10KW, a beam quality M2 factor less than or equal to 1.2, a minimum pulse width of 1ns, and a maximum frequency of 6000KHZ.

[0024] Welding collimator 102 and cutting collimator 111: A device that adjusts the divergent laser light output from the optical fiber into nearly parallel light.

[0025] The coaxial image acquisition device 103 is a conventional imaging device that focuses the weld spot image obtained by the second beam splitter 105, the first beam splitter 108, the laser galvanometer 107 and the focusing mirror 113 onto the target surface for image acquisition.

[0026] The first beam splitter 108 is a 45° beam splitter lens that can transmit 1064 nm infrared laser light at 0° and reflect 635 nm visible light at 45°.

[0027] The second beam splitter 105 is a 45° beam splitter lens that can transmit 1064 nm infrared laser light at 0° and reflect 635 nm visible light at 45°.

[0028] Temperature sensor 106: A temperature measuring device that uses infrared radiation energy of an object to focus the infrared radiation energy of the solder joint received by the second beam splitter 105, laser galvanometer 107, and focusing mirror 113 to measure the temperature of the solder joint.

[0029] Laser galvanometer 107: Also known as a laser scanner, it consists of an XY optical scanning head, which is composed of an electronic drive amplifier and an optical reflector. Signals from a computer controller drive the optical scanning head through the drive amplifier circuit, thereby controlling the deflection of the laser beam in the XY plane.

[0030] Focusing mirror 113: a lens that focuses the combined laser beam output by the laser galvanometer 107 and works near the focal plane of the objective lens.

[0031] The coaxial optical path cutting and welding method designed in this invention can be used to process copper strips with a thickness of 0.05 mm or greater. The operation method is as follows: First, adjust the optical system so that the laser focus is the processing surface, the laser spot power density is 104-106 W / cm2, and the MOPA and QCW laser spot is 100-700 μm. Then, follow the steps below to process:

[0032] Step 1: Fix the left and right fixtures on the left and right movable platforms. At the upper left position, align the 0.05mm thick copper strip on the left with the positioning pin, and insert the fixture cover to press the strip.

[0033] Step 2: Use computer control board and integrated laser cutting and welding software to adjust the mobile platform and lifting platform to test the position where the laser spot is the smallest when the laser is the strongest. The laser spot is 100-700um.

[0034] Step 3: Adjust the cutting coordinates in the integrated software according to the product size, and the mobile platform drives the left fixture 114 to the left cutting position so that the laser can accurately act on the processing position of the left copper strip.

[0035] Step 4: Prepare the cutting pattern in the integrated software according to the strip size, set the MOPA laser parameters to laser power 100W, laser pulse width 1-5ms, frequency 1-200HZ, laser times 1-10 times, and adjust the laser galvanometer 107 to make the laser speed 1-500mm / s.

[0036] Step 5: Trigger the laser. Under the action of infrared laser radiation, the cutting of the left strip is completed, and the left fixture 114 retreats to the upper left material position.

[0037] Step 6: Repeat the second, third, fourth and fifth actions of the left material strip on the right side to complete the cutting of the right material strip. The right jig 115 strip stops at the right cutting position.

[0038] Step 7: The left movable platform 116 feeds the left cut strip to the right cutting position to complete the splicing of the left and right strips.

[0039] Step 8: According to the splicing size of the left and right material strips, make the welding pattern in the integrated software, set the QCW laser parameters to laser power 150W, laser pulse width 1-5ms, frequency 1-30HZ, laser times 1-10 times, and adjust the laser galvanometer 107 to make the laser speed 30-200mm / s.

[0040] Step 9: Switch QCW to welding laser, trigger the laser, and perform laser processing on the left and right strips under the action of infrared laser radiation to achieve high-quality fine micro-welding of non-ferrous metal strips.

[0041] Step 10: Turn off the laser, allow the strip to cool, and form a solder joint. The mobile platform remains stationary during the laser emission process. There is no spatter on the solder joint surface.

[0042] Step 11: If there are multiple strips, the mobile platform repeats the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth actions.

[0043] When using traditional cutting and laser welding methods for copper materials thinner than 0.1mm, stainless steel and most other metal alloys can curl during the mechanical cutting process, affecting weld precision and strength. However, the coaxial cutting and welding optical path of the present invention is capable of cutting copper materials thicker than 0.05mm, stainless steel, and most other metal alloys. This not only solves the curling problem of traditional cutting tools, but also significantly improves the quality and efficiency of the welding process. The MOPA infrared laser parameters include a wavelength of 800-1200nm, an average power of 50-300W, a peak power greater than 10kW, a beam quality M2 factor less than or equal to 1.2, a minimum pulse width of 1ns, and a maximum frequency of 6000kHz. The light energy generated by the MOPA infrared laser is easily absorbed by highly reflective materials, making it easy to cut copper materials thicker than 0.05mm, stainless steel, and most other metal alloys by adjusting the laser parameters. Furthermore, the QCW fiber infrared laser easily allows for precise control of the laser radiation energy by controlling the pulse width and repetition rate, making it suitable for welding terminal strips in fields such as stamping, electroplating, secondary molding, secondary stamping, and automated assembly. It improves production efficiency and reduces scrap, making it the first choice for high-end material strips.

[0044] The above description is only a preferred embodiment of the present invention and does not limit the structure of the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A cutting and welding device for a material strip with a coaxial optical path, comprising a welding laser (101), a welding collimator (102) arranged along the optical path of the welding laser (101); a cutting laser (109), and a cutting collimator (111) arranged along the optical path of the cutting laser (109), characterized in that: It also includes a conversion mechanism for converting cutting and welding functions; a laser galvanometer (107) for adjusting the laser spot position and motion trajectory output by the welding collimator (102) and the cutting collimator (111); a beam combining mirror (112) for combining the welding laser beam output by the welding collimator (102) and the cutting laser beam output by the cutting collimator (111); and a focusing mirror (113) for focusing the combined laser beam output by the beam combining mirror (112); the cutting laser beam output by the cutting collimator (111) is coaxially output with the welding laser beam output by the welding collimator (102) through the conversion mechanism; the conversion mechanism includes a reflector (104) arranged at 45 degrees to the cutting laser beam output by the cutting collimator (111) and a focusing mirror (113) for driving the cutting collimator (111). A driving mechanism for causing the reflector (104) to reciprocate and forcing the reflector (104) to enter or exit the optical path of the cutting laser beam output by the cutting collimator (111); the reflector (104) is arranged at the intersection of the optical path of the welding laser beam output by the welding collimator (102) and the optical path of the cutting laser beam output by the cutting collimator (111); the driving mechanism includes a cylinder (110); the left and right material strips are respectively fixed on the left and right jigs, which are respectively fixed on the left and right moving platforms; the left moving platform drives the left jig (114) to the left cutting position to complete the cutting of the left material strip; the right moving platform drives the right jig (115) to the right cutting position to complete the cutting of the right material strip; the left moving platform (116) feeds the cut material strip on the left to the right cutting position to complete the splicing of the left and right material strips.

2. The cutting and welding device for a coaxial optical path of a material strip according to claim 1, characterized in that: A coaxial image acquisition device (103) and a temperature sensor (106) are respectively provided on the optical path of the welding laser beam output by the welding collimator (102) and the combined optical path of the welding laser beam output by the welding collimator (102) and the cutting laser beam output by the cutting collimator (111).

3. The cutting and welding device for a coaxial optical path of a material strip according to claim 1, characterized in that: At least one first beam splitter (108) is provided on the optical path of the welding laser beam output by the welding collimator (102), and at least one second beam splitter (105) is provided on the combined optical path of the welding laser beam output by the welding collimator (102) and the cutting laser beam output by the cutting collimator (111), wherein the first beam splitter (108) and the second beam splitter (105) are both arranged at 45 degrees to their respective optical paths.

4. A method for cutting and welding a material strip coaxial optical path based on the material strip coaxial optical path cutting and welding device according to any one of claims 1 to 3, characterized in that: The left and right material strips are fixed on the left and right jigs respectively, the position of the left jig (114) is adjusted to the left cutting position, the cutting laser parameters are set, and the cutting laser (109) cuts the left material strip; the position of the right jig (115) is adjusted to the right cutting position, the cutting laser parameters are set, and the cutting laser (109) cuts the right material strip; the positions of the left and right jigs are adjusted to the splicing position, the cutting laser (109) is switched to the welding laser (101), the welding laser parameters are set, and the welding laser (101) performs laser splicing on the left and right material strips; the adjustment of the left jig (114 ) position to the left cutting position is: adjusting the plane position and height of the left jig (114) so ​​that the light spot of the cutting laser (109) is located at the starting cutting position of the left material strip and the light spot size of the cutting laser (109) is 100-700um; the method of adjusting the position of the right jig (115) to the right cutting position is: adjusting the plane position and height of the right jig (115) so that the light spot of the cutting laser (109) is located at the starting cutting position of the right material strip and the light spot size of the cutting laser (109) is 100-700um.

5. The method for cutting and welding a material strip with a coaxial optical path according to claim 4, wherein: The setting of the cutting laser parameters includes setting the speed of the cutting laser to 1-500 mm / s.

6. The method for cutting and welding a material strip coaxial optical path according to claim 4, wherein: The setting of the welding laser parameters includes setting the speed of the welding laser to 30-200 mm / s.

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