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Title: Simultaneous Micro-EDM and Micro-ECM in Low-resistivity Deionized Water
Keywords: micro-EDM, micro-ECM, hybrid machining, deionzied water, short pulses, error compensation
Issue Date: 22-Mar-2013
Citation: NGUYEN MINH DANG (2013-03-22). Simultaneous Micro-EDM and Micro-ECM in Low-resistivity Deionized Water. ScholarBank@NUS Repository.
Abstract: This thesis presents the Simultaneous Micro-EDM and Micro-ECM (SEDCM) that provides significantly improved surface integrity by removing the defective material layer generated by discharge craters from the machined surface. The concurrent occurrence of electrochemical reaction and electrical discharge is attained by exploiting partially deionized water with appropriate process control. Firstly, the material removal phenomenon of micro-EDM in deionized water and the effectiveness of short voltage pulses in localizing material dissolution have been investigated, from which the mechanism of SEDCM is proposed. Secondly, an analytical model has been proposed to predict the thickness of material layer further dissolved by electrochemical reaction in SEDCM drilling and to identify the critical conditions for transitions of micro-EDM/SEDCM/micro-ECM milling. Finally, a post-processing approach to generate tool paths for fabrication of 3D intricate micro-shapes is presented and geometric models are introduced to account for the effect of electrode corner radius on the profile error. This study is potential for applying in fabrication of micro-molds and dies which entail both good surface finish and high dimensional accuracy.
Appears in Collections:Ph.D Theses (Open)

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