Scale effects and a method for similarity evaluation in micro electrical discharge machining
Scale effects and a method for similarity evaluation in micro electrical discharge machining
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微细放电加工中的尺度效应和相似性评价方法
DOI：
10.3901/cjme.2016.0622.077
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发表时间：
2016-08
影响因子：
4.2
通讯作者：
Zhang Jianhua
中科院分区：
文献类型：
--
作者：
Liu Qingyu;Zhang Qinhe;Wang Kan;Zhu Guang;Fu Xiuzhuo;Zhang Jianhua
电火花加工是一种很有前途的非传统微细加工技术，在制造业有着广泛的应用前景。然而，微细电火花加工时会产生尺度效应，这就使得对微细电火花加工性能的预测和优化变得困难。提出了微细电火花加工中“尺度效应”的新概念，这种尺度效应可以反映微细电火花加工与常规宏细电火花加工加工性能的差异。提出了评价微细电火花加工尺度效应的相似理论。进行了单因素实验，讨论了相似差异和相似精度，并对实验结果进行了分析。结果表明，微细电火花加工的尺度效应输出结果不随放电参数的变化而线性变化。当电容或开路电压减小时，加工时间的相似精度值显著增加。结果表明，放电参数尺度越小，非几何相似程度对几何相似程度的偏差越大，说明放电能量越低的微细电火花加工系统的尺度效应越大。最大相似差为5.34，最大相似精度可达114.03。结果表明，相似精度比相似差更能反映尺度效应及其波动性。因此，相似理论适用于评价微细电火花加工的尺度效应。该研究对优化微细电火花加工参数，提高微细电火花加工性能具有一定的工程价值。
Electrical discharge machining(EDM) is a promising non-traditional micro machining technology that offers a vast array of applications in the manufacturing industry. However, scale effects occur when machining at the micro-scale, which can make it difficult to predict and optimize the machining performances of micro EDM. A new concept of “scale effects” in micro EDM is proposed, the scale effects can reveal the difference in machining performances between micro EDM and conventional macro EDM. Similarity theory is presented to evaluate the scale effects in micro EDM. Single factor experiments are conducted and the experimental results are analyzed by discussing the similarity difference and similarity precision. The results show that the output results of scale effects in micro EDM do not change linearly with discharge parameters. The values of similarity precision of machining time significantly increase when scaling-down the capacitance or open-circuit voltage. It is indicated that the lower the scale of the discharge parameter, the greater the deviation of non-geometrical similarity degree over geometrical similarity degree, which means that the micro EDM system with lower discharge energy experiences more scale effects. The largest similarity difference is 5.34 while the largest similarity precision can be as high as 114.03. It is suggested that the similarity precision is more effective in reflecting the scale effects and their fluctuation than similarity difference. Consequently, similarity theory is suitable for evaluating the scale effects in micro EDM. This proposed research offers engineering values for optimizing the machining parameters and improving the machining performances of micro EDM.
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DOI：
10.1016/j.procir.2013.03.081
发表时间：
2013
期刊：
Procedia CIRP
影响因子：
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作者：
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DOI：
10.1109/33.87318
发表时间：
1991-06
期刊：
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影响因子：
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