A new approach on the determination of ease of machining by EDM processes
A new approach on the determination of ease of machining by EDM processes
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DOI：
10.1016/j.ijmachtools.2007.12.012
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发表时间：
2008-06-01
影响因子：
14
通讯作者：
Mitsui, Kimiyuki
中科院分区：
文献类型：
--
作者：
Mahardika, Muslim;Tsujimoto, Takayuki;Mitsui, Kimiyuki
最近，电火花加工（EDM）加工工件的难易程度由λ来确定。θ理论，它是工件的导热系数（λ）和熔点（θ）与加工时间的乘积。本文对加工不同工件材料所需的放电脉冲总能量进行了基础研究，提出了一种新的理论，称为λ .theta.rho理论，其中rho为工件的电阻率。不像。理论，理论包括了工件材料的电阻率，因为它涉及到电流转移来产生放电脉冲。通过对放电脉冲数的监测，还发现加工时间不能作为衡量加工难易程度的参数，因为它受到许多复杂因素的影响，如粘附、空化和短路。为了测量加工难易程度，引入了与加工复杂程度无关的参数；放电脉冲总能量、放电脉冲数、平均放电脉冲能量、放电脉冲密度、刀具电极磨损等。结果表明，λ .theta.rho理论中各参数的相关系数远高于λ。θ理论。因此，理论比理论要好。θ理论在确定电火花加工的容易程度。(c) 2008 Elsevier Ltd.版权所有。
Recently, the ease of machining a workpiece by electrical discharge machining (EDM) processes has been determined by lambda.theta theory, which is the product of the thermal conductivity (lambda) and melting point (theta) of the workpiece in relation to the machining time. This paper presents a fundamental study of the total energy of discharge pulses required to machine different workpiece materials, and a new theory, referred to as lambda.theta.rho theory, is proposed, where rho is the electrical resistivity of the workpiece. Unlike the lambda.theta theory, the lambda.theta.rho theory includes the electrical resistivity of the workpiece material, because it involves the electric current transfer to create the discharge pulse. Using discharge pulse count monitoring, it was also revealed that the machining time cannot be used as a parameter to measure the ease of machining, since it is affected by many complications such as adhesion, cavitations, and short-circuiting. Parameters that are independent of machining complications are introduced in order to measure the ease of machining; the total energy of discharge pulses, discharge pulse number, average discharge pulse energy, discharge pulse density, and tool electrode wear. The results show that the coefficient of correlation for each parameter from the lambda.theta.rho theory is much higher than the lambda.theta theory. Thus, the lambda.theta.rho theory is better than the lambda.theta theory in determining the ease of EDM processes. (c) 2008 Elsevier Ltd. All rights reserved.