电火花线切割加工参数对高碳马氏体不锈钢变质层的影响

摘要

The surface damage of material from wire electrical discharge machining (WEDM) directly influences the quality and efficiency of whole process. The rule of the affected layer on high-carbon martensitic stainless steel by the pulse current parameters and wire speed of WEDM were studied. The experimental results show that the affected layer is formed on the cutting surface influenced by the instantaneous high temperature of the pulse current and rapid cooling of the cycle liquid. Among all the process parameters of the WEDM ,duration and peak current are not only the main part of the input energy,but also the main factor of the affected layer. By contrast the influence from the gap of pulse width and wire speed is much less.%电火花线切割加工对材料造成的表面损伤直接影响加工质量和效率。研究了往复走丝电火花线切割加工脉冲电流参数和走丝速度等对高碳马氏体不锈钢表面变质层的影响规律。实验结果表明：材料切割表面在脉冲电流下加热至极高温度和冷却液迅速冷却的共同作用下形成熔态激冷的变质层。在电火花线切割加工的诸多工艺参数中，脉冲电流的放电时间为输入能量的主要部分，也是造成材料表面变质的主要因素，而脉冲间隙宽度、走丝速度等因素对表面变质层的影响并不显著。