Effect Of Cavitation Shotless Peening On Fatigue Strength Of Steel Gear

Author:  M. Seki, H. Soyama, M. Fujii, A. Yoshida
Source:  Conf Proc: ICSP-10 Tokyo, Japan 2008
Doc ID:  2008052
Year of Publication:  2008
Abstract:  
ABSTRACT The purpose of this study is to investigate the effect of cavitation shotless peening (CSP) on the rolling contact fatigue strength of steel gears. The casehardened steel rollers and gears treated by the CSP were fatigue-tested using a roller testing machine and a gear testing machine. The hardness and the compressive residual stress of the test rollers and gears were increased by the CSP. The work-hardened layer due to the CSP was in a range of a depth of about 0.5mm below the surface. While, the surface roughness of the peened rollers and gears was similar to that of the non-peened ones. In the fatigue tests, the rolling contact fatigue life of most peened rollers and gears was longer than that of the non-peened ones. This study revealed that the rolling contact fatigue strength of steel gears was improved by the increase in surface hardness due to the CSP. KEY WORDS Gear, Peening, Cavitation, Fatigue, Hardness