脉冲能量及脉冲宽度对激光打孔物态转化的影响(英文)  

Influence of Laser Pulse Energy and Pulse Duration on Change of States in Laser Hole Drilling

作　　者：王学东[1] 张晓兵[1] 张晓鹏[1] 孙瑞峰[1] 

机构地区：[1]北京航空制造工程研究所高能束流加工技术国防科技重点实验室,北京100024

出　　处：《稀有金属材料与工程》2013年第S2期205-208,共4页Rare Metal Materials and Engineering

基　　金：NSFC(50824001)

摘　　要：基于脉冲激光制孔过程中复杂的能量、动量及质量传输及耦合过程及气、液、固及等离子体各物态之间的转化,研制了激光打孔多物态转化计算模型,能够对脉冲能量作用下的激光打孔动态过程进行数学描述,并通过实验验证了计算模型的正确性。对脉冲能量、脉冲宽度2个参数对再铸层及去除率的影响进行研究。结果表明,脉冲能量、脉冲宽度对再铸层及去除率具有重要影响,较低的脉冲能量和脉冲宽度有利于减少再铸层,但脉冲能量较低时去除率较低,而脉冲宽度对去除率的影响比较复杂,其原因是脉冲宽度变化导致峰值功率、脉冲作用时间同时变化,因此要综合考虑这2个因素的影响。A multi-physical-state calculation model was constructed based on the complicated transportation and coupling process of energy,momentum and mass.Through calculating the conversion between phases of gas,liquid,solid and plasma,this model could provide a mathematical depiction of dynamic process of pulsed laser holing with adequate accuracy,and the model was validated by experiments.The influence of pulse energy and pulse duration on the change of states during laser drilling was also studied.The results show that pulse energy and duration have a significant influence on the amount of recast material and removal rate.Low pulse energy and duration are helpful to reduce the amount of recast material,but lead to low removal rate.The influence of pulse duration on removal rate is complicated,because the changing of pulse duration lead to simultaneous varying of peak power and acting time of laser pulse.

关 键 词：激光打孔 再铸层 去除率 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]