基于脉冲电源的金属电化学线切割工艺研究

Technological research of metal wire electrochemical cutting based on pulse power

为了提高金属电化学线切割精度,将脉冲电源应用到切割加工中,根据电化学加工原理,并以切割缝宽为切割效果的评价标准,建立了脉冲电源切割理论模型,得出了影响缝宽变化的工艺参数,主要有:电源的电压幅值、脉冲宽度、占空比和进给速度等。并在此基础上对参数进行了优化加工实验。研究结果表明,在保证加工稳定的条件下,通过降低电压、调小脉冲宽度和占空比的方法,加工出的切割缝宽比直流电源加工出的缝宽明显减小,该方法将有望直接用于小尺寸零件的加工。

Aiming at improving the machining precision and surface quality in metal wire electrochemical cutting,the pulse power was applied on cutting machine tool.A theory model based on the pulse power was established,whose evaluation criterion of cutting effects is the width of cutting width.Side width change was mainly affected by voltage,pulse width,duty cycle and feeding speed of tool cathode so on.The optimization of the parameters was tested.The experimental results show that the seam width which is processed by lowering the voltage,reduceing pulse width and turning down the duty cycle is smaller than DC power processing width.It is possible to apply this method into processing of small size parts.