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Title: Simultaneous micro-EDM and micro-ECM in low-resistivity deionized water
Authors: Nguyen, M.D.
Rahman, M. 
Wong, Y.S. 
Keywords: Deionized water
Hybrid machining
Short pulses
Issue Date: Mar-2012
Source: Nguyen, M.D., Rahman, M., Wong, Y.S. (2012-03). Simultaneous micro-EDM and micro-ECM in low-resistivity deionized water. International Journal of Machine Tools and Manufacture 54-55 : 55-65. ScholarBank@NUS Repository.
Abstract: Micro-EDM and micro-ECM are two suitable machining processes for micro- and nano-fabrication. Each process alone has some undesirable effects which confine its capability. By appropriate combination of these two processes, the adverse effects can be significantly mitigated. However, micro-EDM operates in non-conductive dielectric fluid whereas micro-ECM employs conductive electrolyte. Because of two rather divergent requirements, micro-EDM and micro-ECM are usually used sequentially. By using low-resistivity deionized water, which exhibits both characteristics of a slightly conductive fluid and a dielectric fluid, this study aims to combine micro-EDM and micro-ECM in a unique hybrid machining process to achieve improved performance in both surface finish and machining accuracy. Through the analysis of material removal phenomenon in micro-EDM using low-resistivity deionized water, it is found that there is a conversion of material removal mechanism from mere micro-EDM to hybrid micro-EDM/ECM when low feedrate is applied. Arising from this observation, a novel hybrid machining process, named as simultaneous micro-EDM and micro-ECM (SEDCM), has been developed. Three key factors of SEDCM, namely low-resistivity deionized water, low feedrate and short voltage pulses, are identified. © 2011 Elsevier Ltd. All rights reserved.
Source Title: International Journal of Machine Tools and Manufacture
ISSN: 08906955
DOI: 10.1016/j.ijmachtools.2011.11.005
Appears in Collections:Staff Publications

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