基于改进型控制变量法的脉冲激光打孔研究  

Study on Pulse Laser Drilling Based on Improved Parameter Control Method

作　　者：李涛 夏凯波[1] 任乃飞[1] 高福强 张文[1] 田佳男 范永胜 Li Tao;Xia Kaibo;Ren Naifei;Gao Fuqiang;Zhang Wen;Tian Jianan;Fan Yongsheng(School of Mechanical Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China)

机构地区：[1]江苏大学机械工程学院,江苏镇江212013

出　　处：《激光与光电子学进展》2020年第19期167-175,共9页Laser & Optoelectronics Progress

基　　金：江苏省研究生科研创新计划项目(KYCX17-1763)。

摘　　要：使用毫秒脉冲激光精密打孔系统,在厚度为2 mm的镍基高温合金GH4037上进行通孔加工。针对传统控制变量法中通孔加工脉冲个数设定值过盈会造成诸多不利影响等问题,利用穿透检测技术建立脉冲个数阈值的数学模型,并使用基于此模型得到的改进型控制变量法研究了激光的离焦量、扩束比和脉冲重复频率对出入口孔径、锥度和打孔效率的影响。研究表明,当离焦量为-2~0 mm、扩束比为2~4、重复频率为45~85 Hz、辅助气体为氧气时能够得到较高的打孔效率,与传统控制变量法相比,打孔效率最高可提升89.09%。Via-hole processing was carried out in the 2 mm thick nickel-base superalloy GH4037 by the millisecond pulse laser precision drilling system.In order to solve the problem that the overflow of the set number of via-hole machining laser pulses in the traditional control variable method might cause many adverse effects,the mathematical model of the threshold number of laser pulses was established by the penetration detection technology.The influence of the defocusing amount,the beam expanding ratio and the pulse repetition frequency of the laser on the inlet and outlet aperture,the taper and the drilling efficiency was studied by the improved control variable method based on the mathematical model.The results indicated that when the defocusing amount was-2 mm to 0 mm,the beam expanding ratio was 2 to 4,the repetition frequency was 45 Hz to 85 Hz,and the auxiliary gas was oxygen,the drilling efficiency could be improved by 89.09%compared with the traditional control variable method.

关 键 词：激光光学 脉冲激光 冲击打孔 穿透检测 改进型控制变量法 

分 类 号：TN24[电子电信—物理电子学]