Fabrication of high aspect ratio micro-holes on 304 stainless steel via backside-water-assisted laser drilling

材料科学 制作 激光打孔 钻探 冲孔 圆度(物体) 激光器 过程(计算) 激光切割 复合材料 机械工程 光学 计算机科学 冶金 病理 工程类 替代医学 物理 操作系统 医学
作者
Hailong Zhang,Yang Mao,Min Kang,Chenbin Ma,Hao Li,Yongnian Zhang,Xingsheng Wang
出处
期刊:Optics and Lasers in Engineering [Elsevier BV]
卷期号:162: 107426-107426 被引量:15
标识
DOI:10.1016/j.optlaseng.2022.107426
摘要

Backside-water-assisted laser drilling (BWALD) is a viable and effective alternative of laser direct drilling (LDD) to fabricate micro-holes. However, it still has its own limitations, primarily due to the generated air bubbles and debris during the drilling process and the involvement of various processing parameters, especially when fabricating micro-holes with high aspect ratios on the non-transparent materials. In this study, a two-step processing strategy based on the sequence of punching through and modification was developed to fabricate the micro-holes on 304 stainless steel. Based on this strategy, two modification methods, namely single circle modification (SCM) and concentric circle modification (CCM), were proposed to amplify the advantages of BWALD during the modification process. Experiments testified that the two-step processing strategy was capable of reducing the taper and improving the roundness during BWALD process. Furthermore, a new strategy of using flowing water (backside-flowing-water-assisted laser drilling, BFWALD) was proposed to solve the problem that the generated air bubbles and debris prevent the water from penetrating the through-hole. It was found that the BFWALD could effectively improve the stability during the modification process and achieved the fabrication of micro-holes with an aspect ratio of 10:1 and a taper of only 0.38° successfully.
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