激光切割相对冲压及线切割工艺具有自由度大、加工效率高、不会影响铁心质量等优点,但由于残渣及切口粗糙问题一定程度上影响了激光切割硅钢片的质量和应用范围。通过采用在工件底部增设辅助侧吹喷嘴,控制熔渣流向,保证成品切割质量激光切割工艺,试验证明,合理控制工艺参量,可获得良好效果。利用有限元法进一步对工件底部气流状况进行了数值模拟,分析了流动过程中在不同的角度和流速下光斑移动和气流场变化的情况,初步确定工件底部侧吹气流以20°吹入的辅助侧吹工艺,为进一步合理控制熔渣流向获得光滑的精细切口提供了实践和理论依据。

Compared with the traditional blanking technology such as punching and linear cutting, the laser cutting technology has many advantages. For example, it has large freedom and high working efficiency. It will not cause such problems that will affect the quality of iron core as injuries of insulation, extrusion of edge, and so on. But during the laser cutting process, the generation of dross and the rough cutting edge limit its application. A new laser cutting technology is proposed which uses an additional nozzle under the workpiece to form lateral gas flow and control the flowing direction of the slag gas. The experiments prove that glossy and dross-free kerfs are obtained by controlling the technical parameters reasonably. The gas flow under the workpiece is simulated by finite element method (FEM). The variety of pneumatic fields when the additional nozzle is in different angle and flow velocity is analyzed, and the nozzle angle of 20° is preferred, which provide experimental and academic basis for controlling the flowing direction of the slag gas and achieving glossy kerfs.