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微水射流导引激光束精密加工是一项世界性的前沿技术,综合了激光加工和水射流切割的优点,具有相当优异的加工性能。本文从工程热物理和流体力学基础出发对此过程中的流动现象进行分析,研究微水射流导引激光束精密打孔的动力学过程,采用有限体积法(Finite Volume Method)建立了描述其间物理过程的数值模型。对打孔过程中熔池内部的流动和传热进行了模拟和分析,得到了不同时刻熔池内的温度和流场分布,计算结果显示:孔刚形成时孔的传播速率要大于停滞区界面的传播速率;随着孔的加深,停滞区界面停止向孔的内部传播。
Micro-jet-guided laser beam precision machining is a worldwide cutting-edge technology that combines the advantages of laser machining with water jet cutting with exceptionally good processability. In this paper, the flow phenomena in this process are analyzed based on the engineering thermophysics and fluid mechanics. The dynamic process of micro-jet-guided laser beam precision drilling is studied. The finite volume method (FEM) Numerical model of the process. The flow and heat transfer inside the puddle during drilling are simulated and analyzed, and the temperature and flow field distribution in the puddle at different times are obtained. The calculated results show that the propagation velocity of the hole is larger than that of the stagnant zone Propagation rate; as the hole deepens, the dead-zone interface stops propagating to the inside of the hole.