Improvement of wire electrical discharge machining efficiency in machining polycrystalline silicon with auxiliary-pulse voltage supply

Po Huai Yu, Yang Xin Lin, Hsiang Kuo Lee, Chao Chuang Mai, Biing Hwa Yan

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

This study proposes a novel pulse voltage configuration, auxiliary-pulse voltage, for wire electrical discharge machining (WEDM) of polycrystalline silicon (polysilicon) used in solar cell production. It is developed with the objectives of reducing material waste due to the large kerf loss as well as achieving greater efficiency and better quality compared with conventional machining approaches. Experimental results show that compared with conventional-pulse voltage supply, the auxiliary-pulse voltage mode can avoid delay in electrical discharge during pulse-on time. Enhanced frequency of effective discharge for machining would increase machining speed, which would in turn reduce machining groove width, and obtain better surface roughness. In addition, parameters of significant influence on machining characteristics were examined with the Taguchi method, and the optimal combination levels of machining parameters were determined. In sum, our findings reveal that WEDM with auxiliary-pulse voltage supply is an effective approach to machining polysilicon with good quality and high efficiency achieved.

Original languageEnglish
Pages (from-to)991-1001
Number of pages11
JournalInternational Journal of Advanced Manufacturing Technology
Volume57
Issue number9-12
DOIs
StatePublished - Dec 2011

Keywords

  • Auxiliary-pulse voltage
  • Polysilicon
  • Solar cell
  • Taguchi method
  • Wire electrical discharge machining (WEDM)

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