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|Title:||Modeling of surface roughness and the role of debris in micro-EDM|
|Publisher:||ASME-AMER SOC MECHANICAL ENG|
|Citation:||JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME, 129(2), 265-273|
|Abstract:||Surface roughness is one of the important quality characteristic of a micromachined component. This paper presents a model to predict surface roughness of micro-EDmachined surfaces. The model is based on the configuration of a single-spark cavity formed as a function of process parameters. Assuming the normal distribution of surface heights, the mu and sigma (R-q) of the surface profile arc evaluated after every spark. The model was further extended to capture the role of debt-is in inicro-EDM in changing electric potential at the micropeaks on the cathode surfaces. The chemical kinetics approach was used to evaluate the change in plasma enthalpy and composition as a result of debris inclusion in the dielectric. The corresponding energy distribution between the electrodes was used to predict configuration of the single-spark cavity and the consequent surface roughness using the earlier surface roughness model. The modeling results were found to agree well with the inicro-EDM validation experiments performed without and with the inclusion of artificial debris (iron particles) in the dielectric.|
|Appears in Collections:||Article|
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