The present study establishes the optimum process condition for additive mixed electrical discharge machining of Al7075–5%B₄Cp metal matrix composite by performing experimental investigation. The suspension of chromium particles in a dielectric fluid is used as an additive. The input process parameters selected for experimentation are specifically pulse on-time, gap voltage, pulse off-time and peak current, for analysing their influence on wear of the tool along with surface roughness of the composite. Comparative study of the machined surface is done by analysing microstructures, cracks and recast layers formed at different settings of input parameters using a scanning electron microscope. Rise in amount of current and pulse on-time led to increased height of the recast layer generated on the surface of the machined workpiece. Furthermore, a confirmatory experiment was performed at the optimal setting. The result revealed an error of 5.5% and 7.5% between experimental and predicted value of tool wear rate and surface roughness.

本研究建立了Al7075–5%B ₄添加剂混合放电加工的最佳工艺条件Cp 金属基复合材料进行实验研究。铬颗粒在介电流体中的悬浮液用作添加剂。为实验选择的输入工艺参数具体是脉冲导通时间、间隙电压、脉冲关断时间和峰值电流，用于分析它们对工具磨损以及复合材料表面粗糙度的影响。加工表面的比较研究是通过使用扫描电子显微镜分析在不同输入参数设置下形成的微观结构、裂纹和重铸层来完成的。电流量和脉冲导通时间的增加导致加工工件表面上产生的重铸层的高度增加。此外，在最佳设置下进行了验证实验。结果显示误差为 5.5% 和 7。