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不同脉宽纳秒激光致铝材损伤特性与打孔机理

Damage threshold and drilling mechanism of aluminum plate by nanosecond laser with different pulse widths

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摘要

为了获得纳秒激光脉宽对铝材的损伤特性, 给纳秒激光金属加工的脉宽选择提供依据, 采用面积推算法, 利用光学显微镜、扫描电镜、表面轮廓仪等仪器, 测试了37种脉宽纳秒激光(脉宽10ns~520ns, 波长1064nm)对铝材的损伤阈值。研究了脉宽不变时激光脉冲数目对铝板的损伤规律, 揭示了不同脉宽纳秒激光对铝板打孔的作用机理。结果表明, 单脉冲损伤阈值与纳秒激光脉宽的平方根成线性关系。当脉冲个数增加时, 材料的损蚀阈值呈现下降趋势; 铝板打孔时, 纳秒激光的脉宽越窄, 对铝的损伤阈值越低; 打孔过程中蒸发过程占主导, 孔内壁烧蚀熔融物越少, 孔圆度越好, 孔口喷溅物越少, 打孔质量越高。该结果可为纳秒激光金属加工的脉宽选择提供参考。

Abstract

In order to get the damage features of nanosecond laser pulse width to aluminium and provided the basis for choosing proper pulse width in the processing of metals by nanosecond laser, by using the area calculation method and instruments (optical microscope, scanning electron microscope and surface profiler), the damage thresholds of 37 kinds of nanosecond laser (pulse width of 10ns~520ns, wavelength of 1064nm) on aluminium were obtained. The effects of laser pulse number on damage thresholds of aluminium were analyzed with constant pulse width. The function mechanism of nanosecond laser pulse width on the quality of drilling holes in aluminium was also revealed. The results show that the damage threshold of single pulse is linearly related to the square root of laser pulse width of nanosecond laser. The damage threshold of aluminium decreases with the increase of the number of pulse width. The narrower the pulse width of nanosecond laser is, the higher the damage threshold to aluminium is. Evaporation process occupies the leading position during the drilling process. Furthermore, the less the melted thing on the inner wall of hole is, the better the circular degree of hole will be. The less the spraying materials in the orifice is, the higher the quality of drilling will be. The results provide the guide for choosing proper pulse width in the processing of metals with nanosecond laser.

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中图分类号:TG665

DOI:10.7510/jgjs.issn.1001-3806.2017.03.024

所属栏目:激光与光电子技术应用

基金项目:湖北省教育厅科技研究计划资助项目(B2016051;Q20151408);国家科技支撑计划资助项目(2015BAF20B03);湖北省高等学校优秀中青年科技创新团队计划资助项目(610112052); 东北大学轧制技术与连轧自动化国家重点实验室开放课题基金资助项目(2016001)

收稿日期:2016-04-25

修改稿日期:2016-07-06

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作者单位    点击查看

娄德元:湖北工业大学 机械工程学院, 武汉 430068
熊 厚:湖北工业大学 机械工程学院, 武汉 430068
伍义刚:湖北工业大学 机械工程学院, 武汉 430068
翟中生:湖北工业大学 机械工程学院, 武汉 430068
陈 列:湖北工业大学 机械工程学院, 武汉 430068
戚得众:湖北工业大学 机械工程学院, 武汉 430068
杨奇彪:湖北工业大学 机械工程学院, 武汉 430068
刘 顿:湖北工业大学 机械工程学院, 武汉 430068

联系人作者:娄德元(Loudeyuan@mail.hbut.edu.cn)

备注:娄德元(1979-), 男, 博士, 现从事激光加工的研究。

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引用该论文

LOU Deyuan,XIONG Hou,WU Yigang,ZHAI Zhongsheng,CHEN Lie,QI Dezhong,YANG Qibiao,LIU Dun. Damage threshold and drilling mechanism of aluminum plate by nanosecond laser with different pulse widths[J]. Laser Technology, 2017, 41(3): 427-432

娄德元,熊 厚,伍义刚,翟中生,陈 列,戚得众,杨奇彪,刘 顿. 不同脉宽纳秒激光致铝材损伤特性与打孔机理[J]. 激光技术, 2017, 41(3): 427-432

被引情况

【1】明兴祖,申警卫,金磊,明瑞. 脉冲激光精微烧蚀合金钢表面热影响研究. 应用激光, 2020, 40(1): 42-49

【2】明兴祖,申警卫,金磊,明瑞. 脉冲激光精微烧蚀合金钢表面热影响研究. 应用激光, 2020, 40(1): 42-49

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