6mm碳钢板的激光切割性能

Performance of 6 mm Mild Steel Sheet Laser Cutting

采用2.0 kW六轴机器人光纤激光切割系统,研究了切割工艺参数对厚度6 mm的碳钢板的切口宽度、切口倾斜角度、切口表面粗糙度及切口微观状态的影响规律。研究结果表明,该系统的最佳切割工艺参数为切割速度约2.0 m/min、辅助气体压力14.7 N/cm2、聚焦镜焦距f=200 mm、激光光斑直径0.3 mm、离焦量范围+4^+5 mm、切割喷嘴直径0.8 mm。在最佳切割工艺参数下,切口宽度0.5~0.6 mm,切口倾斜角度0.2°~0.5°,切口表面挂渣很少,切割时切面的顶部和底部呈现不同的平整度而分成两个不同的部分,底部温度较高,氧化速度领先切割速度的差距大于顶部,所以平整度较差。与CO2激光切割相比,光纤激光切割的切口表面粗糙度略小,切割功率效率提高2.6倍。

A 2.0 kW six-axis robot fiber laser cutting system is used to study the impact of cutting process parameters on the kerf width, bevel angle, cutting surface roughness and incision microscopic state of 6 mm thick steel plate. The results show that the optimum cutting process parameters are cutting speed about 2.0 m/min, auxiliary gas pressure 14.7 N/cm2, focusing lens focal length f=200 mm, laser spot diameter 0.3 mm, defocusing amount ＋4~＋5 mm, cutting nozzles diameter 0.8 mm. Under the optimum cutting process parameters, the kerf width is 0.5~0.6 mm, the cutting tilt angle is 0.2°~0.5° and the cutting surface roughness is small. Cutting surface is divided into two different parts because of the top and bottom sections show different flatness. The temperature in the bottom is higher, the gap between oxidation rate and cutting rate is greater than that on the top, so the flatness is poor. Compared with CO2 laser cutting, fiber laser cutting surface roughness is better and the cutting power efficiency is increased by 2.6 times.