High-power galvanometer welding coaxial imaging achromatic system

Abstract

The utility model discloses a high-power galvanometer welding coaxial imaging achromatic system which comprises a high-power laser, an image collector, a reflector, a spectroscope, a galvanometer welding system, a light source and a working face. The high-power laser, the spectroscope, the galvanometer welding system, the light source and the working face are sequentially arranged in the laser propagation direction. The light source is located above the working face, the light source, the spectroscope reflector and the image collector are sequentially arranged in the direction of a reflection light path of the working face, and the light source is a 940 nm / 1050 nm annular light source. According to the coaxial imaging achromatic system for welding the high-power galvanometer, the imaging chromatic aberration is greatly reduced, so that a preset track is closer to an actual track of laser work, the time for correcting the track can be greatly shortened, and the accuracy is greatly improved. Meanwhile, the design of the high-power laser band achromatic field lens is simplified, the selection space of the lens material is increased, the quartz material can be considered, the tolerance power is increased, the consumption of the sapphire material is reduced, and the cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to a high-power galvanometer welding coaxial imaging achromatic system, belonging to the technical field of laser welding coaxial imaging achromatic technology. Background Art

[0002] Laser welding is an efficient and precise welding method that uses a high-energy-density laser beam as a heat source. Laser welding is one of the important aspects of the application of laser material processing technology. The welding process is a heat conduction type, that is, the laser radiation heats the surface of the workpiece, and the surface heat diffuses to the inside through heat conduction. By controlling the width, energy, peak power and repetition frequency of the laser pulse, the workpiece is melted to form a specific molten pool. Due to its unique advantages, it has been successfully applied to the precision welding of micro and small parts.

[0003] With kilowatt-level continuous CO 2 The success of laser welding experiments led to a breakthrough in laser welding technology in the early 1970s. 2 Laser welding forms a weld with deep penetration, which clearly indicates the formation of keyholes, and the deep penetration weld produced by laser welding is similar to that of electron beam welding. These early works using CO2 lasers for metal welding demonstrated the great potential of high-power continuous laser welding. In the aviation industry and many other applications, laser welding can achieve the connection of many types of materials, and laser welding generally has many advantages that cannot be matched by other fusion welding processes. In particular, laser welding can connect thin-plate alloy materials such as aluminum alloys that are difficult to weld in the aviation and automotive industries, and the deformation of the components is small and the joint quality is high. Another attractive application of laser processing is the use of the laser's ability to achieve localized small-area heating characteristics. This hot spot of the laser makes it very suitable for welding electronic devices such as printed circuit boards. The laser can produce a very high average temperature in a very small area on the electronic device, while the area outside the joint is basically unaffected.

[0004] The current industrial laser application field has increasingly higher requirements for the precision of imaging systems during laser welding. However, due to the large distance between the common working wavelength (such as 1070±10nm) and the imaging wavelength (such as 450±10nm), chromatic aberration will inevitably occur, resulting in a large gap between the trajectory marked by the red light and the laser welding trajectory, which seriously affects the welding effect.

[0005] Most current solutions are to design achromatic field mirrors to reduce the chromatic aberration between the working wavelength and the imaging wavelength. However, in reality, it is very difficult to design large-scale incident light spots and large-format achromatic field mirrors. The materials are single and expensive, the design cycle is long, and the use in high-power environments is limited. Summary of the invention

[0006] The utility model provides a high-power galvanometer welding coaxial imaging achromatic system, which effectively reduces the chromatic aberration between the working wavelength and the imaging wavelength, improves the welding effect, and simplifies the design of the achromatic field mirror.

[0007] In order to solve the above technical problems, the technical solutions adopted by the present utility model are as follows:

[0008] A high-power galvanometer welding coaxial imaging achromatic system, comprising a high-power laser, an image collector, a reflector, a beam splitter, a galvanometer welding system, a light source and a working surface;

[0009] A high-power laser, a beam splitter, a galvanometer welding system, a light source and a working surface are arranged in sequence along the propagation direction of the laser;

[0010] The light source is located above the working surface. The light source, the beam splitter reflector and the image collector are arranged in sequence along the direction of the reflected light path of the working surface. The light source is a 940nm / 1050nm annular light source.

[0011] The above system can effectively reduce the chromatic aberration between the working wavelength and the imaging wavelength, thereby improving the welding effect.

[0012] In order to prevent high exposure when high-power laser is turned on, the high-power galvanometer welding coaxial imaging achromatic system also includes a narrow-band filter, which is arranged between the reflector and the image collector. In this way, the rest of the band light beams can be screened out to avoid disturbing the imaging and damaging the digital CCD.

[0013] The above narrow band filter is a 940nm / 1050nm narrow band filter. "940nm / 1050nm" means 940nm and / or 1050nm. The setting of the 940nm / 1050nm narrow band filter can filter out the remaining band light beams to avoid disturbing the imaging and damaging the digital CCD.

[0014] The utility model selects 940nm / 1050nm imaging band, and needs a digital CCD capable of sensing infrared band to ensure imaging quality.

[0015] The above-mentioned beam splitter is a beam splitter of 940nm / 1050nm band, that is, the reflection surface of the beam splitter can reflect the laser band and transmit 940nm / 1050nm.

[0016] In order to simplify the optical path structure, the above-mentioned beam splitter forms an angle of 135° with the working surface.

[0017] The above-mentioned reflector is a broadband reflector.

[0018] In order to simplify the optical path structure, the reflecting surface of the reflector is at an angle of 135° to the working surface.

[0019] With the above system, the reflected light energy after the 940nm / 1050nm light source irradiates the working end face is finally transmitted to the digital CCD.

[0020] The utility model is based on 940nm / 1050nm band illumination imaging, which is close to the commonly used high-power laser band and can greatly reduce chromatic aberration. On this basis, the difficulty of further designing the achromatic field mirror of the 940nm / 1050nm band and the high-power laser band is also reduced. At the same time, the achromatic field mirror can also achieve an increase in format and an increase in the size of the incident light spot during design, greatly improving the application range of the field mirror. In addition, the conventional field mirror lens material is single and expensive. Using the 940nm / 1050nm band as the imaging band and further designing the field mirror can increase the lens material selection space and reduce costs.

[0021] The technologies not mentioned in this utility model are all referred to the prior art.

[0022] Compared with the existing technology, the high-power galvanometer welding coaxial imaging achromatic system of the utility model greatly reduces the imaging chromatic aberration, makes the predetermined trajectory closer to the actual trajectory of the laser work, can greatly shorten the time of trajectory correction, and greatly increase the accuracy. At the same time, it simplifies the design of the achromatic field mirror in the high-power laser band, increases the space for lens material selection, and can consider quartz material, increase the tolerance power, reduce the consumption of sapphire material, and greatly reduce the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the high-power galvanometer welding coaxial imaging achromatic system of the utility model;

[0024] In the figure, 1 is a high-power laser light source, 2 is an image collector, 3 is a narrow-band filter, 4 is a reflector, 5 is a spectroscope, 6 is a galvanometer welding system, 7 is a light source, and 8 is a working surface. DETAILED DESCRIPTION

[0025] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with embodiments, but the content of the present invention is not limited to the following embodiments.

[0026] Example 1

[0027] like Figure 1 As shown, a high-power galvanometer welding coaxial imaging achromatic system includes a high-power laser 1, an image collector 2, a narrow-band filter 3, a reflector 4, a beam splitter 5, a galvanometer welding system 6, a light source 7 and a working surface 8;

[0028] A high-power laser 1, a beam splitter 5, a galvanometer welding system 6, a light source 7 and a working surface 8 are arranged in sequence along the propagation direction of the laser;

[0029] The light source 7 is located above the working surface 8. The light source 7, the beam splitter 5, the reflector 4, the narrowband filter 3 and the image collector 2 are arranged in sequence along the direction of the reflected light path of the working surface 8. The light source 7 is a 940nm / 1050nm annular light source. The image collector 2 is a digital CCD camera; the beam splitter 5 is a 940nm / 1050nm band beam splitter, and the reflective surface of the beam splitter 5 is at an angle of 135° to the working surface 8; the reflector 4 is a wide-band reflector, and the reflective surface of the reflector 4 is at an angle of 135° to the working surface 8. The working wavelength of the high-power laser 1 is 1070±10nm, and the power is 3000w.

[0030] The high-power laser light source 1 emits laser to the beam splitter 5, which then reflects the laser into the galvanometer welding system 6 (WLD-1070-D30-C150-F330) and propagates to the working surface 8 to complete welding; at this time, the 940nm / 1050nm ring light source emits an imaging light source to the working surface 8 and reflects back to the galvanometer welding system 6, and then passes through the beam splitter 5 and the reflector 4, and the stray light is filtered out by the 940nm / 1050nm narrow-band filter 3, leaving only the imaging light source, and finally enters the digital CCD for imaging.

[0031] In the existing galvanometer welding system, a 450nm light source is used as the imaging light source. In actual use, the deviation between the 2mm weld track and the track marked by the red light is 1.6mm, that is, the chromatic aberration coefficient is 0.8, and the deviation is very obvious.

[0032] In the high-power galvanometer welding coaxial imaging achromatic system of this example, if the imaging light source adopts a 940nm ring light source, the deviation between the 2mm weld of the welding track and the track marked by the red light is 0.24mm, that is, the chromatic aberration coefficient is 0.12. It can be seen that the galvanometer welding system using a 940nm imaging light source can reduce the chromatic aberration to one-sixth of 450nm, greatly reducing the calibration time and difficulty. If the imaging light source adopts a 1050nm ring light source, the deviation between the 2mm weld of the welding track and the track marked by the red light is 0.1mm, that is, the chromatic aberration coefficient is 0.05. It can be seen that the galvanometer welding system using a 1050nm imaging light source can reduce the chromatic aberration to one-sixteenth of 450nm. The chromatic aberration at this time is significantly reduced and it is difficult for the human eye to detect. On this basis, calibrating the track also becomes easier.

Claims

1. A high-power galvanometer welding coaxial imaging achromatic system, characterized by: It comprises a high-power laser (1), an image collector (2), a reflector (4), a beam splitter (5), a galvanometer welding system (6), a light source (7) and a working surface (8); A high-power laser (1), a beam splitter (5), a galvanometer welding system (6), a light source (7) and a working surface (8) are arranged in sequence along the propagation direction of the laser; The light source (7) is located above the working surface (8); the light source (7), the beam splitter (5), the reflector (4) and the image collector (2) are arranged in sequence along the direction of the reflected light path of the working surface (8); the light source (7) is a 940nm / 1050nm annular light source.

2. The high-power galvanometer welding coaxial imaging achromatic system according to claim 1, characterized in that: It also comprises a narrowband filter (3), which is arranged between the reflector (4) and the image collector (2).

3. The high-power galvanometer welding coaxial imaging achromatic system as claimed in claim 2, characterized in that: The narrowband filter (3) is a 940nm / 1050nm narrowband filter.

4. The high-power galvanometer welding coaxial imaging achromatic system according to any one of claims 1 to 3, characterized in that: The image collector (2) is a digital CCD camera.

5. The high-power galvanometer welding coaxial imaging achromatic system according to any one of claims 1 to 3, characterized in that: Spectrometer (5) 40nm / 1050nm band spectrometer.

6. The high-power galvanometer welding coaxial imaging achromatic system according to any one of claims 1 to 3, characterized in that: The reflection surface of the beam splitter (5) and the working surface (8) form an angle of 135°.

7. The high-power galvanometer welding coaxial imaging achromatic system according to any one of claims 1 to 3, characterized in that: The reflector (4) is a wide-band reflector.

8. The high-power galvanometer welding coaxial imaging achromatic system according to any one of claims 1 to 3, characterized in that: The reflecting surface of the reflecting mirror (4) forms an angle of 45° with the working surface (8).

9. The high-power galvanometer welding coaxial imaging achromatic system according to any one of claims 1 to 3, characterized in that: The operating wavelength of the high power laser (1) is 1070±10nm.

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