管径和光斑影响激光切割开始瞬间吸收率的分析

Theoretical Analysis of the Effects of Pipe Diameter and Laser Beam Diameter on the Initial Instantaneous Absorptivity of Laser Cutting

从理论上研究了曲率半径 (管径 )和激光光斑直径对 30 4不锈钢管材和板材激光切割时开始瞬间吸收率的影响。结果表明 ,当激光光斑直径d与物体外表面的管径 (曲率半径 )D之比大于 0 86 6时 ,它们对激光切割开始瞬间吸收率的影响不能忽略 ,且随着管径 (曲率半径 )的减小或激光光斑直径的增大 。

The effects of curvature radius(pipe diameter) and laser beam diameter on the initial instantaneous absorptivity of laser cutting for 304 stainless steel pipe and plate were investigated theoretically. The theoretical analysis showed that the pipe diameter D and the laser beam diameter d had important effect on the initial instantaneous absorptivity of laser cutting as the ratio of d to D is bigger than 0.866, and the initial instantaneous absorptivity of laser cutting increases with the pipe diameter (curvature radius) decreases or the laser beam diameter increases.