摘要
金属表面微结构加工精度是决定破裂膜片工作性能稳定的关键因素,直接影响发动机点火的成败。基于热传导方程建立破裂膜片表面微结构刻痕加工过程的光、热耦合仿真模型,通过理论分析和仿真计算微结构温度场,基于库伦爆炸原理研究飞秒激光加工表面刻痕微结构的成形机制,并分析激光脉冲参数对刻痕微结构成形的影响规律。结果表明,飞秒激光单脉冲烧蚀作用呈现非热熔态,加工热影响区小,随着脉冲能量持续作用,金属表面热累积的平衡温度逐渐升高,最终达到热累积平衡态。通过适当降低脉冲能量,同时保持能量值大于铝合金材料的烧蚀阈值,可显著减少加工剩余热量,有效预防加工中铝合金材料表面氧化;在保证加工效率的前提下,通过降低脉冲重复频率可减少热累积平衡温度,提高功能部件表面微结构的加工精度。
The machining precision of metal surface microstructure is crucial for the stability of functional components,which directly impacts the success of engine ignition.A simulation model of optical and thermal coupling during the processing of surface microstructure scratches on rupture discs based on the heat conduction equation was established.Through theoretical analysis and simulation calculation of the microstructure temperature field,the forming mechanism of surface microstructure scratches processed by femtosecond laser was studied based on the Coulomb explosion principle,and the influence of laser pulse parameters on the formation of microstructure scratches was analyzed.The result indicated that femtosecond laser single pulse ablation exhibits a non-hot melt state with a small processing heat affected zone.As the pulse energy continues to act,the equilibrium temperature of heat accumulation on the metal surface gradually increases and eventually reaches a state of heat accumulation equilibrium.By appropriately reducing the pulse energy while maintaining an energy value greater than the ablation threshold of aluminum alloy material,residual processing heat could be significantly reduced and surface oxidation of aluminum alloy material could be effectively prevented.Furthermore,by reducing the pulse repetition frequency while ensuring processing efficiency,the heat accumulation equilibrium temperature could be reduced,thereby improving the processing precision of rupture discs' surface microstructure.
作者
叶金鑫
徐世俊
刘晓
董丰波
孙立凡
YE Jinxin;XU Shijun;LIU Xiao;DONG Fengbo;SUN Lifan(Shanghai Aerospace Equipment Manufacturer Co.,Ltd.,Shanghai 200245,China)
出处
《电加工与模具》
北大核心
2025年第1期50-54,共5页
Electromachining & Mould
基金
国家重点研发计划项目(2022YFB4601700)。
关键词
飞秒激光
热积累
脉冲能量
脉冲频率
femtosecond laser
heat accumulation
pulse energy
pulse frequency
