往复走丝双级张力控制系统设计及切割研究  

Design and Cutting Research of Dual-stage Tension Control System of HSWEDM

作　　者：张志浩 刘志东[1] 邓聪 张翼 张旭东 王晅 ZHANG Zhihao;LIU Zhidong;DENG Cong;ZHANG Yi;ZHANG Xudong;WANG Xuan(College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Hangzhou Hua Fang CNC Machine Tools Co.,Ltd.,Hangzhou 310024,China)

机构地区：[1]南京航空航天大学机电学院,江苏南京210016 [2]杭州华方数控机床有限公司,浙江杭州310024

出　　处：《电加工与模具》2023年第3期20-25,共6页Electromachining & Mould

基　　金：国家自然科学基金项目(51975290)。

摘　　要：针对传统重锤张力机构对电极丝张力变化响应速度低、无法准确调整电极丝张力等问题,设计了一种由弹簧张力和电机张力机构组合而成的双级张力控制系统,以分别响应电极丝张力的高频和低频变化。针对系统涉及的弹簧和电机张力分配问题,引入张力灵敏度概念。结果表明:当张力灵敏度为0.05 N时,电极丝张力较为平稳;通过200 mm厚度工件多次切割试验,在相同加工参数条件下,双级张力控制系统与电机张力机构相比,工件的腰鼓度误差降低了31%、表面粗糙度值降低了28%,说明双级张力控制系统可有效调节电极丝张力的高、低频变化,从而提高工件加工精度和表面质量。Aiming at the low response speed of the traditional hammer tension mechanism to the changing speed of the wire tension,the problems of the electrode wire tension cannot be accurately adjusted,the limitations of the hammer tension mechanism are analyzed,and it is improved to the motor tension mechanism.Combined with spring tension and motor tension mechanism to respond to the high frequency and low frequency changes of the electrode wire tension.Aiming at the distribution of spring and motor tension involved in the system,the concept of tension sensitivity is introduced.The test shows that when the tension sensitivity is 0.05 N,the wire tension is relatively stable.Through the 200 mm thickness workpiece cutting test.The dual-stage tension control system is compared with the motor tension system under the same processing parameters,and the workpiece drum-shaped inaccuracy is reduced by 31%,and the surface roughness reduces 28%,indicating that the double-stage tension control system can effectively adjust the high and low frequency changes of the wire tension,thereby improving the processing accuracy and surface quality.

关 键 词：电火花线切割加工 张力控制 双级张力 张力灵敏度 多次切割 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]