旋转气流控制激光切割硅钢新技术

针对目前激光切割工艺的缺点，提出采用氧辅助激光切割以降低所需激光切割功率，通过在工件底部加设旋风除渣器，形成旋转气流控制熔渣流向以去除熔渣的激光切割硅钢新技术。采用CO2激光器，对0.5 mm厚度硅钢片进行切割试验，试验结果表明，通过旋转气流主动控制，当气流处于层流状态时，可在较低激光切割功率时获得光滑的精细切口。利用有限元法对工件底部气流状况进行数值模拟，验证了旋转气流的工作规律，能为合理控制熔渣流向提供理论依据。

New Technology of Laser Cutting Silicon Steel Controlled by Rotating Gas Flow

In order to avoid the demerits of currently main laser cutting technology, a novel method of laser cutting silicon steel by using a cyclone slag separator put under the workpiece that will form rotating gas flow to control the direction of the flowing slag gas is presented. Laser cutting of 0.5 mm silicon steel sheet with CO2 laser is experimentally studied. The experiments prove that glossy and dross-free cutting kerfs can be obtained under lower laser cutting power when the gas flow is laminar flow in the tube controlled by rotating gas flow. The gas flow acting under the workpiece is simulated by finite element method (FEM). The operating law of the rotating gas flow is verified by ANSYS, which provide academic basis for controlling the flowing direction of the slag gas reasonably.