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基于自适应镜的可变圆光斑激光熔覆光学系统

Laser Cladding Optical System with Variable Circular Light Spot Based on Adaptive Mirror

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摘要

为实现不等壁厚复杂零件的激光增材制造,设计开发了一种基于自适应镜的可变圆光斑激光熔覆光学系统。系统由反射式抛物准直镜、反射式自适应镜和反射式抛物聚焦镜等组成。通过气压比例阀调节自适应镜腔内气压,改变自适应镜表面曲率半径,使光束以不同程度的会聚角或发散角入射到反射式抛物聚焦镜,从而改变作用在工件表面的激光光斑大小。建立了基于自适应镜变斑光学系统的物理模型,通过Matlab和Zemax软件仿真分析了自适应镜焦距的变化范围、反射式抛物准直镜与反射式抛物聚焦镜的焦距和位置,以及光纤激光光源参数等对系统变斑特性的影响。采用6 kW光纤激光器,按照变光斑、变功率、等速度、等功率密度的方案进行激光熔覆工艺实验,实现了壁厚由3 mm渐变到8 mm的椭圆形工件的激光熔覆增材制造。

Abstract

In order to realize the laser additive manufacturing of complex parts with unequal wall thickness, a variable circular spot laser cladding optical system based on adaptive mirror is proposed. The system consists of reflective parabolic collimating mirror, reflective adaptive mirror and reflective parabolic focusing mirror. The air pressure proportional valve is used to adjust the gas pressure in the adaptive mirror cavity, to change the radius of curvature of the adaptive mirror surface, and make the beam incident on the reflective parabolic focusing mirror at different convergence angles or divergence angles, so as to change the spot size acting on the surface of the workpiece. Physical model is established based on adaptive mirror variable spot optical system, and using Matlab and Zemax softwares, the effects of the range of the adaptive mirror focal length, the focal length and position of the reflective parabolic collimating mirror and the reflective parabolic focusing mirror, and the parameters of the fiber laser source on the variable spot characteristics of the system are analyzed. A 6 kW fiber laser is used to carry out cladding experiment according to the scheme of variable spot, variable power, constant speed and constant power density, and an elliptical workpiece with a wall thickness of 3-8 mm is realized.

Newport宣传-MKS新实验室计划
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中图分类号:TN249

DOI:10.3788/CJL202047.0302007

所属栏目:激光制造

基金项目:国家重点研发计划、国家自然科学基金;

收稿日期:2019-09-27

修改稿日期:2019-10-28

网络出版日期:2020-03-01

作者单位    点击查看

秦应雄:华中科技大学光学与电子信息学院激光加工国家工程研究中心, 湖北 武汉 430074
张怀智:华中科技大学光学与电子信息学院激光加工国家工程研究中心, 湖北 武汉 430074
昌思怡:华中科技大学光学与电子信息学院激光加工国家工程研究中心, 湖北 武汉 430074
潘新宇:华中科技大学光学与电子信息学院激光加工国家工程研究中心, 湖北 武汉 430074
唐霞辉:华中科技大学光学与电子信息学院激光加工国家工程研究中心, 湖北 武汉 430074

联系人作者:秦应雄(qyx@hust.edu.cn)

备注:国家重点研发计划、国家自然科学基金;

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引用该论文

Qin Yingxiong,Zhang Huaizhi,Chang Siyi,Pan Xinyu,Tang Xiahui. Laser Cladding Optical System with Variable Circular Light Spot Based on Adaptive Mirror[J]. Chinese Journal of Lasers, 2020, 47(3): 0302007

秦应雄,张怀智,昌思怡,潘新宇,唐霞辉. 基于自适应镜的可变圆光斑激光熔覆光学系统[J]. 中国激光, 2020, 47(3): 0302007

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