Analysis of Explosive Load on Wire Surface Generated by Discharge of Wire EDM

H. Obara, M. Nakase, T. Ohsumi, M. Hatano
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Abstract

In this study, the explosive load acting on a wire surface generated by discharges at the rough cut and the finish cut of wire EDM is investigated. The hydrodynamic explosion process in the water-filled gap from each discharge is numerically analyzed using the adiabatic bubble expansion model, and the impulsive load acting on the wire surface is calculated. The distribution formula of the discharge number on the wire surface is derived and the total load acting on the wire generated by continuous discharges is estimated. The analyzed results are compared with the experimental results and also with those derived from the simple model, assuming that the impulsive load of each discharge is constant and acts normally on the wire surface. Results show that the influence of the skimmed depth on the wire deflection at the finish cut is explained by the numerically analyz.ed results but not by those of the simple modeL
电火花放电对线材表面产生的爆炸载荷分析
本文研究了电火花线切割粗切和精切时放电对线材表面产生的爆炸载荷。采用绝热气泡膨胀模型,数值分析了每次放电充水间隙内的水动力爆炸过程,计算了作用在导线表面的脉冲载荷。推导了导线表面放电次数的分布公式,并估计了连续放电对导线产生的总载荷。将分析结果与实验结果进行了比较,并与假设每次放电的脉冲载荷恒定并正常作用于导线表面的简单模型的结果进行了比较。结果表明,通过数值分析可以解释略削深度对精切线材挠度的影响。而不是简单模型的结果
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