A Comparison in Laser Precision Drilling of Stainless Steel 304 with Nanosecond and Picosecond Laser Pulses

作     者：ZHANG Hongyu DI Jianke ZHOU Ming YAN Yu 

作者机构：State Key Laboratory of Tribology Tsinghua University Center for Photon Manufacturing Science and Technology Jiangsu University Corrosion and Protection Center Beijing University of Science and Technology 

出 版 物：《Chinese Journal of Mechanical Engineering》 (中国机械工程学报（英文版）)

年 卷 期：2014年第27卷第5期

页      面：972-977页

核心收录：

学科分类：08[工学] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：Supported by National Basic Research Program of China(Grant No.2011CB013004) National Natural Science Foundation of China(Grant No.51005130) Research Fund of State Key Laboratory of Tribology,Tsinghua University(Grant no.SKLT12B06) 

主　　题：laser drilling nanosecond laser picosecond laser helical drilling recast layer 

摘      要：Precision drilling with picosecond laser has been advocated to significantly improve the quality of micro-holes with reduced recast layer thickness and almost no heat affected ***,a detailed comparison between nanosecond and picosecond laser drilling techniques has rarely been reported in previous *** the present study,a series of micro-holes are manufactured on stainless steel 304 using a nanosecond and a picosecond laser drilling system,*** quality of the micro-holes,e.g.,recast layer,micro-crack,circularity,and conicity,etc,is evaluated by employing an optical microscope,an optical interferometer,and a scanning electron ***,the micro-structure of the samples between the edges of the micro-holes and the parent material is compared following etching *** researching results show that a great amount of spattering material accumulated at the entrance ends of the nanosecond laser drilled *** formation of a recast layer with a thickness of;5μm is detected on the side walls,associated with initiation of *** phenomenon is also observed and the circularity of the micro-holes is rather *** regard to the micro-holes drilled by picosecond laser,the entrance ends,the exit ends,and the side walls are quite smooth without accumulation of spattering material,formation of recast layer and *** circularity of the micro-holes is fairly good without observation of tapering ***,there is no obvious difference as for the micro-structure between the edges of the micro-holes and the parent *** study proposes a picosecond laser helical drilling technique which can be used for effective manufacturing of high quality micro-holes.