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采用紫铜工具电极,在峰值电流为4-24A、脉冲宽度为25-200μs、加工电压为80-200V的电参数范围内,综合应用因子试验和正交试验方法,对难加工材料4Cr5MoVSi进行了电火花加工试验。在进行电加工基础特征规律分析的基础上,考查了电参数对加工速度、双边侧面放电间隙、电极损耗的影响,并对电火花加工机理进行了分析。研究结果表明:采用紫铜电极电火花加工4Cr5MoVSi,在本试验范围内,峰值电流Ip与脉冲宽度ti、加工电压U、脉冲间隔t0存在一定的交互作用;与其它三个因素相比,峰值电流对加工速度、电极损耗、双边侧面放电间隙的影响更显著;随脉冲宽度和加工电压的增大,电极损耗逐渐减小。
Using copper tool electrode, in the range of electric parameters of peak current of 4-24A, pulse width of 25-200μs and processing voltage of 80-200V, the refractory material 4Cr5MoVSi was electrified by comprehensive application of factor test and orthogonal test method Spark processing test. Based on the analysis of the basic characteristics of electrical processing, the influence of electrical parameters on machining speed, bilateral discharge gap and electrode loss was investigated. The EDM mechanism was also analyzed. The results show that there is a certain interaction between the peak current Ip and the pulse width ti, the processing voltage U and the pulse interval t0 in this experimental range. The sparking process of 4Cr5MoVSi by the copper electrode shows that there is a certain interaction between the peak current Ip and the three other factors The influence of processing speed, electrode loss and bilateral side discharge gap is more significant. With the increase of pulse width and processing voltage, the electrode loss gradually decreases.