中文摘要：

为提高缝阵天线薄板的激光切割质量,介绍了一种基于气熔比控制的激光精密切割方法。在Nd∶YAG脉冲激光切割系统上,试验研究了气熔比对激光切割0.5 mm厚6063铝合金薄板质量的影响,即气熔比对切口宽度、切口表面质量、重铸层和挂渣的影响。对气熔比分别为2.62,3.06和4.11的3组试件进行检测与观察,发现提高气熔比,可减小重铸层、增大切口表面光滑区、改善激光切割质量。试验获得切口顶部宽度为0.2 mm,底部无挂渣,重铸层厚度为2.03μm,切口表面光滑区比例占切口的40%。结果表明,研究气熔比可深化对激光加工机理的认识,有效地提高铝合金薄板激光切割质量。

英文摘要：

To improve the laser cut quality of slot array antenna sheet,a new method of laser precision cutting is presented based on vaporization-melt ratio controlled method.The cutting qualities of 6063 aluminum sheets of 0.5 mm in thickness are researched which are cut on a Nd∶YAG pulse laser cutting system,and the effects of vaporization-melt ratio on kerf width,recast layer,kerf sides,and adhering slag are studied as well.Observation on samples of different vaporization-melt ratios（2.62,3.06,4.11） shows that high vaporization-melt ratio can improve laser cut quality with decreasing recast layer and increasing the smooth zone of kerf sides.The cut kerfs of 0.2 mm in width on the top,no adhering slag on the bottom,recast layer of 2.03 μm in thickness,and percentage of the smooth zone 40% out of whole thickness are obtained by experiment.The research on vaporization-melt ratio provides the deeper understanding of mechanism of laser cutting,and improves laser cut quality effectively.