6kW大功率光纤激光器切割6mm不锈钢工艺.pdf

学兔兔 焊接现场 机械制造文摘——焊接分册 6 kW大功率光纤激光器切割6 mm不锈钢工艺 王威，上媛媛， 王旭友。 雷振， 林尚扬 (哈尔滨焊接研究所，黑龙江 哈尔滨 150080) 摘要：采用6 kW光纤激光器切割6 mm不锈钢，分析了不同的激光切割工艺参数，如激光功率、切割速度、切割气体种类 及压力、焦点位置以及激光倾斜角度对切割质量的影响。以切缝背部的挂渣情况作为评判切缝质量的标准，结果表明：增 大切割气体压力可以降低底部挂渣以及粗糙度，但是压力达到一定程度后，挂渣和粗糙度没有明显变化；在切割厚板时， 焦点位置位于工件的下部并且越靠近底表面，效果越好；光束入射倾角超过25。，切割质量变差，甚至切不透。通过大量的 切割工艺试验得到在切割气体为N ，激光功率为3．3 kW，切割速度为2．0 m／min，离焦量为一4 mm，气体压力为1．7 MPa， 喷嘴到工件表面距离为1．0 mm时，切割质量最佳。 关键词：光纤激光；激光切割；不锈钢 中图分类号：G485 Cutting process of 6 mm stainless steel plate with a 6 kW fiber laser Wang Wei，Shang Yuanyuan，Wang Xuyou，Lei Zhen，Lin Shangyang (Harbin Welding Institute，Harbin 1 50080，China) Abstract：Gas assisted laser cutting of 6 mm stainless steel plate was performed with a 6 kW fiber laser．The effects ot’laser pow— er，cutting speed，assist gas and pressure，focal point position and angle on the cutting performance and qu~ity were investigated． The dross of cut surface was investigated to evaluate cutting quality．The result showed that the increment of gas pressure could re— duce the dross at the bottom of the plate，but when the gas pressure be reached a certain de~ee，the dross and roughness didn’t reduce significantly．The focus position was located in the subsurface the plate when the thick plate was cut，and the better quality can be obtained．If the laser incident angle was more than 25。，cutting quality deteriorated and even can’t be completely cut through the plate．A large number of tests indicated that the best cutting quality was achieved when assisted gas was N2，laser pow— er was 3．3 kW，cutting speed was 2．0 m／min，defocus amount was一4 mm，assisted gas pressure was 1．7 MPa，and di