Study of surface integrity using the small area EDM process with a copper-tungsten electrode

Hwa Teng Lee, Fu Chuan Hsu, Tzu Yao Tai

研究成果: Article同行評審

112 引文 斯高帕斯(Scopus)

摘要

The present study performs the small area electro-discharge machining (EDM) process with a low wear-rate copper-tungsten electrode of diameter 1.5 mm to establish the influence of the EDM parameters on various aspects of the surface integrity of AISI 1045 carbon steel. The residual stress induced by the EDM process is measured using the Hole-Drilling Strain-Gage Method. The experimental results reveal that the values of material removal rate (MRR), surface roughness (SR), hole enlargement (HE), average white layer thickness (WLT), and induced residual stress tend to increase at higher values of pulse current and pulse-on duration. However, for an extended pulse-on duration, it is noted that the MRR, SR, and surface crack density all decrease. Furthermore, the results indicate that obvious cracks are always evident in thicker white layers. A smaller pulse current (i.e. 1 A) tends to increase the surface crack density, while a prolonged pulse-on duration (i.e. 23 μs) widens the opening degree of the surface crack, thereby reducing the surface crack density. The EDM hole drilling process induces a compressive residual stress within the workpiece. A linear relationship is identified between the maximum residual stress and the average white layer thickness. It is determined that the residual stress can be controlled effectively by specifying an appropriate pulse-on duration.

原文English
頁(從 - 到)346-356
頁數11
期刊Materials Science and Engineering A
364
發行號1-2
DOIs
出版狀態Published - 2004 1月 15

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)
  • 凝聚態物理學
  • 材料力學
  • 機械工業

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