中国激光, 2008, 35 (11): 1853, 网络出版: 2008-11-17   

一种大功率激光加工用新型宽带光斑成形抛物面镜

Novel Kind of Wide-Band Shaping Parabolic Mirror for High Power Laser Processing
作者单位
1 华中科技大学光电子科学与工程学院,湖北 武汉 430074
2 华中科技大学温州先进制造技术研究院,浙江 温州 325003
摘要
介绍了一种大功率激光加工用新型宽带光斑成形抛物面镜的设计原理和实验结果。根据几何光学原理,采用光线追迹的方法对该抛物面镜的光斑进行分析,证明通过抛物面镜反射聚焦后,能够将原始圆形激光束整形为光强分布均匀的窄条形光斑。并利用该新型抛物面镜及横流CO2激光器,对45#钢进行了激光相变硬化研究,测量了淬火带尺寸和淬硬层深度,并对硬化层形貌及其金相组织进行了观察和分析。结果表明,当激光器输出功率为3 kW,窄条光斑长度12 mm,扫描速度15 mm/s时,该45#钢淬硬层硬度值可达540~580 HV0.3,是非淬硬层的3.5~4倍。淬硬层深度约为1 mm,单道淬火宽度10 mm以上,硬化层分布均匀。
Abstract
The design principle and experiment result of a novel kind of wide-band shaping parabolic mirror for high power laser processing are introduced. According to the geometrical optics, the focusing spot of this parabolic mirror is studied by ray tracking. It is demonstrated that after being focused by this parabolic mirror, the original circular laser beam could be shaped into the narrow strip with uniform distribution of light intensity. The laser hardening is carried out for 45# steel using crosscurrent CO2 laser and the parabolic mirror, the laser hardening band size and hardened depth are tested, then the hardened layer shape and microstructure in the hardened layer are observed and analyzed. The results show that the micro hardness is 3.5~4 times as high as the unquenched area which reaches 540~580 HV0.3, when the laser output power is 3 kW, the length of the strip spot is 12 mm and the scanning speed is 15 mm/s . The hardened depth is approximately 1 mm, the single quenching width is larger than 10 mm , and the hardened layer is well-distributed.

罗曦, 陈培锋, 王英, 熊文策. 一种大功率激光加工用新型宽带光斑成形抛物面镜[J]. 中国激光, 2008, 35(11): 1853. Luo Xi, Chen Peifeng, Wang Ying, Xiong Wence. Novel Kind of Wide-Band Shaping Parabolic Mirror for High Power Laser Processing[J]. Chinese Journal of Lasers, 2008, 35(11): 1853.

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