混粉电火花加工过切量研究

电火花加工工件的尺寸精度受过切量影响,而过切量的大小主要取决于放电间隙和电机损耗.为了获得更好的尺寸精度,实验研究了在相同工作环境下混粉电火花加工和常规电火花加工过切量的差别,利用三元线性回归方法分别建立了两种工作液中加工余量的经验公式,通过实验验证了其可信度.结果表明粉末的加入降低了加工余量对蜂值电流和脉冲宽度的敏感程度.

Study of overcut in powder mixed EDM

The dimensional accuracy of electrical discharge machining (EDM) is greatly influenced by the overcut resulting from the discharge gap and electrode wear. To obtain better dimensional accuracy, experiments in both conventional dielectric fluid and powder mixed dielectric fluid were carried out in the same conditions. Empirical formulas were achieved based on the experimental results by ternary linear regression method. The method was proved feasible by the further experimental data. It is concluded that the effect of peak current and pulse duration on the machining allowance is decreased owing to the powder suspending in working fluid.