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以PMMA(有机玻璃)为试件,采用CCD拍摄到CO2激光气化切割前沿的照片。研究焦点位置、切割速度和激光功率对切割前沿形状和前沿深度的影响,并建立激光能量耦合模型。结果表明,由于前沿存在多次反射,使得切割深度增加。正离焦切割时,前沿吸收的总激光功率密度减小,切割深度减小;负离焦切割时,最大激光功率密度值的位置下移,使得前沿功率密度分布朝着深部推进,切割深度增加,若负离焦量过大,表面光斑直径和光程增加,更深位置的功率密度减小,切割深度减小;随着激光功率增加、切割速度减小,则前沿弯曲程度减小,被激光直接照射的前沿部位增长,前沿吸收激光功率密度增加,切割深度增加。
Take PMMA (plexiglass) as the sample, using CCD to photograph the cutting edge of CO2 laser gasification cutting. The influence of focus position, cutting speed and laser power on cutting front shape and leading edge depth was studied, and a laser energy coupling model was established. The results show that the depth of cut increases due to multiple reflections at the front. At the time of defocused cutting, the total laser power absorbed by the leading edge decreases and the depth of cut decreases. In the negative defocus cutting, the position of the maximum laser power density moves downwards, leading the front power density distribution to move deeper and the cutting depth increases , If the negative defocus amount is too large, the surface spot diameter and optical path increase, the deeper the power density decreases, the cutting depth decreases; with the laser power increases, the cutting speed decreases, the frontal bending decreases, the laser direct Radiation frontier growth, cutting edge absorption laser power density increases, cutting depth increases.