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Evaluation of scale effect of micro electrical discharge machining system

机译：微放电加工系统的尺度效应评估

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摘要

Micro electrical discharge machining (EDM) is generally regarded as the application of conventional EDM in micro scale. The energy transfer characteristic and material removal mechanism of micro EDM are differ from that of macro EDM due to the miniaturization of tool electrode and discharge energy. The unexpected machining performance can be attributed to the so-called scale effect. In this study, the similarity theory was used to quantitatively evaluate the scale effect and the effectiveness of this evaluation method was established. In this method, greater similarity precision means more significant scale effect. Tool electrode diameter, capacitance, and open circuit voltage were adopted as factors in orthogonal experiment to explore the scale effect caused by the miniaturization of tool electrode and discharge energy. The single factor scale effect and system scale effect of EDM are evaluated based on orthogonal experiment. Scale effect with different degree is presented in terms of material removal rate (MRR), relative tool wear ratio (RTWR), and overcut (OC). The machining type is transferred from macro EDM to micro EDM as a result of the decrease of machining parameters. A positive scale effect is produced and open circuit voltage is the most important factor for the scale effect of EDM.
机译：微放电加工（EDM）通常被认为是常规的EDM的应用。由于工具电极的小型化和放电能量的增加，微型电火花加工的能量转移特性和材料去除机理与宏观电火花加工不同。出乎意料的加工性能可归因于所谓的氧化皮效应。在这项研究中，使用相似性理论对规模效应进行定量评估，并建立了该评估方法的有效性。在这种方法中，更高的相似度精度意味着更大的比例效应。在正交试验中，以工具电极直径，电容和开路电压为因素，探讨了工具电极小型化和放电能量所引起的尺度效应。基于正交试验，对电火花加工的单因子尺度效应和系统尺度效应进行了评价。根据材料去除率（MRR），相对刀具磨损率（RTWR）和超切削（OC），显示了不同程度的氧化皮效应。由于减少了加工参数，加工类型从宏EDM转换为微型EDM。产生正比例效应，开路电压是EDM比例效应最重要的因素。

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  • 来源
    《Journal of Manufacturing Processes》 |2019年第2期|174-178|共5页
  • 作者

    Wang Kan; Zhang Qinhe; Zhang Jianhua;

  • 作者单位

    Shandong Univ, Associated Engn Res Ctr Mech & Mechatron Equipmen, Weihai City 264209, Peoples R China;

    Shandong Univ, Sch Mech Engn, Minist Educ, Key Lab High Efficiency & Clean Mech Manufacture, Jinan 250061, Shandong, Peoples R China|Shandong Univ, Natl Demonstrat Ctr Expt Mech Engn Educ, Jinan, Shandong, Peoples R China;

    Shandong Univ, Sch Mech Engn, Minist Educ, Key Lab High Efficiency & Clean Mech Manufacture, Jinan 250061, Shandong, Peoples R China|Shandong Univ, Natl Demonstrat Ctr Expt Mech Engn Educ, Jinan, Shandong, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Micro electrical discharge machining; Scale effect; Similarity precision; Material removal rate; Relative tool wear ratio;

    机译：微放电加工;尺度效应;相似精度;去除率;相对磨损率;

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