Modeling of Surface Roughness and The Role of Debris in Micro-EDM  

Oleh:

Kiran, M. P. S. Krishna ; Joshi, Suhas S.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Journal of Manufacturing Science and Engineering vol. 129 no. 2 (2007), page 265-273.
Topik: surface roughness; surface roughness; role of debris; micro - EDM

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ93.9 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

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 µ and (Rq) of the surface profile are evaluated after every spark. The model was further extended to capture the role of debris in micro - 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 micro - EDM validation experiments performed without and with the inclusion of artificial debris (iron particles) in the dielectric.

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