长脉冲激光脉冲串对铝合金打孔的研究

发布时间：2018-03-06 05:33

本文选题：长脉冲激光　切入点：脉冲串　出处：《长春理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文对长脉冲激光脉冲串条件下,铝合金材料打孔的温升与熔蚀过程进行了理论和实验的研究,从而得到了不同激光参数对打孔的影响规律。在理论研究方面,对脉冲串激光打孔机理进行学习和研究,根据经典热传导基本原理,建立了长脉冲激光脉冲串打孔温升模型;在流体力学方程的基础上,采用热焓-孔隙法和气体动力学法完整地描述了熔化和气化两阶段相变,从而建立了长脉冲激光脉冲串打孔熔蚀模型。在理论模型的基础上建立了长脉冲激光脉冲串针对铝合金材料打孔的仿真模型并完成了相关仿真研究。得到了不同能量密度、脉冲个数、脉冲频率条件下,小孔中心温度、深度和纵宽比的变化规律。在实验研究方面,开展了长脉冲激光脉冲串条件下对铝合金材料打孔的温升实验和熔蚀实验,得到了不同能量密度、脉冲个数、脉冲频率条件下,小孔中心温度、深度和纵宽比的变化规律,并分析了其原因。对比仿真和实验结果,发现二者在规律上符合度较好。通过对长脉冲激光脉冲串打孔理论和实验的研究,可以看出:长脉冲激光脉冲串对铝合金打孔时,小孔质量随着能量密度、脉冲个数和脉冲频率的增加逐渐变好,但随着脉冲频率的增加,打孔速率降低。本文研究结果为长脉冲激光脉冲串打孔的工艺改进,提供参考。
[Abstract]:In this paper, the temperature rise and melting process of aluminum alloy materials are studied theoretically and experimentally under the condition of long pulse laser pulse train, and the influence of different laser parameters on drilling is obtained. Based on the basic principle of classical heat conduction, the temperature rise model of long pulse laser pulse string drilling is established, which is based on the hydrodynamic equation, the mechanism of pulse string laser drilling is studied and studied, and based on the basic principle of classical heat conduction, the temperature rise model of long pulse laser pulse string drilling is established. The two-stage phase transition of melting and gasification is described by enthalpy pore method and gas dynamics method. On the basis of theoretical model, the simulation model of long pulse laser pulse string drilling for aluminum alloy material was established, and the related simulation research was completed, and different energy density was obtained. Under the condition of pulse number, pulse frequency, temperature, depth and ratio of longitudinal-width of the hole, the temperature rise experiment and corrosion experiment of aluminum alloy material under the condition of long pulse laser pulse train were carried out. The variation rules of the center temperature, depth and ratio of longitudinal width of the hole under different energy density, pulse number and pulse frequency are obtained, and the reasons are analyzed, and the results of simulation and experiment are compared. It is found that both of them are consistent with each other in law. Through the research on the theory and experiment of long pulse laser pulse string drilling, it can be seen that when long pulse laser pulse string punches the aluminum alloy, the hole quality increases with the energy density. The number of pulses and the pulse frequency increase gradually, but with the increase of the pulse frequency, the drilling rate decreases. The results of this paper provide a reference for the improvement of the drilling process of the long pulse laser pulse string.
【学位授予单位】：长春理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG665;TN249

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