Research of lower tool electrode wear in simultaneous EDM and ECM

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• 作者：Qingfeng Yin ; ^{514054612@qq.com" class="auth_mail} ; ^{yyinqingfeng@163.com" class="auth_mail} ; Baorui Wang ^{wangbaoruixu@163.com" class="auth_mail} ; Yongbin Zhang ^{Fred110@sohu.com" class="auth_mail} ; Fang Ji ^{Jfang2004@sina.com" class="auth_mail} ; Guangmin Liu ^{lgm_zx@163.com" class="auth_mail}
• 关键词：Tool electrode wear ; Electrolyte ; Electro-deposition ; EDM
• 刊名：Journal of Materials Processing Technology
• 出版年：August, 2014
• 年：2014
• 卷：214
• 期：8
• 页码：1759-1768
• 全文大小：2789 K

文摘

Tool electrode wear is a key factor influencing shape accuracy in electrical discharge machining (EDM). In the process of drilling blind holes, wear constantly reduces the length of the tool electrode. As a result, when eroding down to a fixed depth, the real depth of the hole will be significantly smaller. The problems created by tool electrode wear become more complicated when machining complex three-dimensional micro-cavities. Performing electric discharge in deionized water can get less tool electrode wear compared with traditional EDM. However, this process causes excessive electrolytic-erosion and workpiece surface damage as slight electrical conductivity always exists in deionized water. In this manuscript, a new method to reduce the electrode wear and suppress excessive electrolytic-erosion is investigated. Electrolyte with a much higher conductivity than deionized water is utilized as machining fluid in the method, while electro-deposition is used to compensate for tool electrode wear in the processing. Besides, nanosecond voltage pulse and tool electrode with side-insulation are adopted to suppress excessive electrolytic-erosion. Experiment results show that this new method can reduce electrode wear and suppress excessive electrolytic-erosion effectively.