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Laser longitudinal drilling method based on out-of-focus control technology

A drilling method and control technology technology, applied in laser welding equipment, manufacturing tools, welding equipment and other directions, can solve the problems of affecting the airflow flow of the channel, unable to meet the demand, unable to improve the drilling efficiency of the vibration frequency of the galvanometer, etc., to improve the efficiency of drilling. Processing frequency, the effect of good diversion effect

Active Publication Date: 2020-10-30
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are two problems in the commonly used methods: on the one hand, since the vibration frequency of the vibrating mirror at home and abroad is about hundreds of Hz, to further improve the drilling efficiency, the vibration frequency of the vibrating mirror needs to be optimized, but the current vibrating mirror technology The demand cannot be met yet, that is, the drilling efficiency cannot be improved by increasing the vibration frequency of the galvanometer
On the other hand, the circular cutting method will produce textures perpendicular to the direction of the hole depth, which will affect the flow of air in the channel, and put forward higher requirements for the vibration accuracy of the galvanometer.

Method used

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  • Laser longitudinal drilling method based on out-of-focus control technology
  • Laser longitudinal drilling method based on out-of-focus control technology
  • Laser longitudinal drilling method based on out-of-focus control technology

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Effect test

Embodiment 1

[0020] Such as figure 1 As shown, a laser longitudinal drilling method based on defocus control technology, the laser is transmitted through the light guide optical path and then enters the focusing lens 5, the focusing lens 5 focuses the laser on the workpiece, completes the drilling, and at the same time, focuses on the workpiece The focal spot scans and moves along the Z direction reciprocatingly and along the XY plane to realize longitudinal fast scanning ring cutting.

[0021] Along the transmission direction of the laser light, the light guide optical path sequentially includes a wavefront controller 1, a two-dimensional reflection vibrating mirror one 2, a two-dimensional reflection vibrating mirror two 3 and a two-dimensional reflection vibrating mirror three 4, wherein the two-dimensional reflection vibrating mirror The mirror one 2 is arranged obliquely to change the transmission direction of the laser light, and the two-dimensional reflection vibrating mirror one 2 ...

Embodiment 2

[0024] The same part of this embodiment and Embodiment 1 will not be described again, the difference is:

[0025] Taking traditional Gaussian beam focusing processing as an example, set the wavelength of the laser as λ, the focal length of the focusing lens as f, the diameter of the incident beam as D, and the ideal Gaussian beam waist width for processing after focusing is ω 0 , satisfying ω 0 =2.44λf / D. According to the characteristics of the Gaussian beam, the Gaussian beam at the position z from the beam waist has a spherical wavefront, and the radius of curvature R of the wavefront satisfies, When presetting the out-of-focus wavefront, it is necessary to compensate a complementary wavefront, that is, a wavefront with a curvature radius of -R. When the required amount of defocus is That is, the girdle position z needs to be at The range of curvature radius of the preset out-of-focus wavefront can be obtained correspondingly. Rapidly changing the radius of curvature...

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Abstract

The invention relates to a laser longitudinal drilling method based on an out-of-focus control technology, and belongs to the technical field of laser drilling. After laser is transmitted through a light-guiding light path, the laser is injected into a focusing lens, the focusing lens focuses the laser to a workpiece to finish drilling, and a focal spot focused to the workpiece carries out reciprocating motion along a Z direction and moves along an X-Y plane. According to the laser longitudinal drilling method, an out-of-focus wavefront control technology is adopted to accelerate the focal spot to carry out the reciprocating motion along the Z direction, kHz wavefront regulation and control frequency is realized, longitudinal high-speed cutting is finished, and processing efficiency is improved. Meanwhile, the focal spot scans and moves by low frequency along the X-Y plane, laser movement gives priority to a hole depth direction, and a generated texture direction is along the hole depth direction so as to perform a good flow guiding effect than circular cutting scanning for a flow guiding type hole.

Description

technical field [0001] The invention belongs to the technical field of laser drilling, and in particular relates to a laser longitudinal drilling method based on defocus control technology. Background technique [0002] The commonly used methods of laser drilling include circular cutting and helical scanning, etc., through the vibrating mirror to achieve rapid rotation in the xy direction, layer-by-layer ring cutting, and the spatial movement of the lens or lens to realize the slow decline of the processing point in the z direction layer by layer, thereby completing laser drilling. [0003] At present, there are two problems in the commonly used methods: on the one hand, since the vibration frequency of the vibrating mirror at home and abroad is about hundreds of Hz, to further improve the drilling efficiency, the vibration frequency of the vibrating mirror needs to be optimized, but the current vibrating mirror technology The demand cannot be met yet, that is, the drilling ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/382B23K26/064B23K26/082
CPCB23K26/382B23K26/70
Inventor 孙喜博胡东霞黄晚晴王德恩张颖耿远超刘兰琴邓学伟王文义袁晓东
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS