不同工艺参数下超高功率激光切割304 不锈钢厚板断面质量研究

Research on Section Quality of 304 Stainless Steel Thick Plate Cut byUltra-High Power Laser Under Different Process Parameters

为探究厚板激光切割过程中工艺参数对切割断面质量的影响,使用奔腾激光自主研发的30000 W超高功率光纤激光切割机对40 mm厚304不锈钢进行四因素、五水平正交试验,分析残差结果,得到各工艺参数对切割断面指标(上下切缝宽度、垂直度以及上部、中部、下部板材粗糙度值)的影响规律。结果表明:上下表面切缝宽度影响主次为离焦量、辅助气压、激光功率、切割速度;垂直度影响主次为切割速度、离焦量、激光功率、辅助气压;粗糙度影响主次为激光功率、离焦量、辅助气压、切割速度。残差分析结果表明,超高功率激光切割40 mm厚304不锈钢优化工艺参数如下:激光功率为20000 W、切割速度为200 mm/min、辅助气压为18 bar、离焦量为+11 mm。

In order to explore the influence of technological parameters on the cutting section quality in the process of thick plate laser cutting,the 30000 W ultra-high power fiber laser cutting machine independently developed by Penta laser was used to carry out four factors and five levels orthogonal tests on 304 stainless steel with a thickness of 40 mm,and the residual results were analyzed.The influence law of each process parameter on the cutting section index(upper and lower slit width,perpendicularity and the roughness value of the upper,middle and lower plates)was obtained.The results show that the influence of slit width on the upper surface is defocus amount,auxiliary gas pressure,laser power,and cutting speed.The influence of perpendicularity is cutting speed,defocus amount,laser power,and auxiliary gas pressure.The primary and secondary effects of roughness are as follows laser power,defocus amount,auxiliary gas pressure,and cutting speed.The results of the residual analysis show that the optimized process parameters of ultra-high power laser cutting 304 stainless steel with 40 mm thickness are as follows laser power 20000 W,cutting speed 200 mm/min,auxiliary gas pressure 18 bar,and defocus amount+11 mm.