Paper Title:
Research of Mechanism of Chipping in Step Tapping of Superalloy Based on Wavelet Analysis
  Abstract

Stepping tapping is a new tapping mode for Nickel-based superalloy GH4169. Longer life of tap and higher machining efficiency can be obtained. But chipping of tap is very prevalent. In this paper, the mechanism of chipping in step tapping is investigated. Based on the wavelet analysis of the signals of tapping torque, the load applied to the tap in every stage of the period of motion is studied. It is found that chipping is prone to occur at the moment when the rotating direction of tap shifts from forward to backward, which is caused by the too large and rapidly changed tensile stress on cutting edge. The excessive wear of cutting edge results in the too large tensile stress. To reduce the wear, the backward rotating angle of tap should be selected to be smaller than 100°.

  Info
Periodical
Materials Science Forum (Volumes 532-533)
Edited by
Chengyu Jiang, Geng Liu, Dinghua Zhang and Xipeng Xu
Pages
153-156
DOI
10.4028/www.scientific.net/MSF.532-533.153
Citation
F. Q. Han, G. J. Li, X. S. Pang, Z. Z. Li, D. Y. Zhang, "Research of Mechanism of Chipping in Step Tapping of Superalloy Based on Wavelet Analysis", Materials Science Forum, Vols. 532-533, pp. 153-156, 2006
Online since
December 2006
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$32.00
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