Paper Title:
Improvement of Inner Surface for Machine Parts by Shot Peening
  Abstract

Shot peening process of inner surface of machine parts in which rebound shots collide with the inner surface was investigated. The jig used for rebound shot peening has the surface with a slope to the inner surface of machine parts, and the collision direction of shots was vertical to the inner surface. In this process, a compressed air type shot peening machine was employed. The influence of processing conditions was evaluated by the distributions of hardness, residual stress and surface roughness in the test pieces of pipes and coiled springs. The effect of shot peening increases with the increase of shots collision energy. A stress peening process for inner surface of coiled springs using rebound shots was also performed. The coiled spring was provided higher compressive residual stresses. The results of a fatigue test showed that the fatigue life of the spring was improved. The compressive residual stress reduces the tensile stress of coiled spring. It was found that the present process was suitable for improving the inner surface of machine parts.

  Info
Periodical
Materials Science Forum (Volumes 449-452)
Edited by
S.-G. Kang and T. Kobayashi
Pages
345-348
DOI
10.4028/www.scientific.net/MSF.449-452.345
Citation
Y. Harada, S. Maki, K. Mori, L. Wang, "Improvement of Inner Surface for Machine Parts by Shot Peening", Materials Science Forum, Vols. 449-452, pp. 345-348, 2004
Online since
March 2004
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Price
$32.00
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