浸炭硬化鋼ローラの転がり疲れ強さに及ぼすクラウニング半径の影響

概要

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This paper deals with the effect of crowning radius on the rolling contact fatigue strength of case-hardened steel roller. Three types of the rollers, which had crowning radii of 30 mm, 15 mm and 7.5 mm, were fatigue-tested under a sliding rolling contact condition. The rolling contact fatigue strength of the roller became higher as the crowning radius became smaller. The failure modes of the rollers with crowning radii of 15 mm and 7.5 mm were pitting and wear, while the failure mode of the roller with a radius of 30 mm was only pitting. The pitted depth of all rollers depended almost on the depth of the maximum amplitude of the ratio of principal shear stress to Vickers hardness. The rolling contact fatigue life of the rollers could be expressed using non-dimensional value p_<max>/(Λ・Hυ) independent of the crowning radius, where, p_<max>, and Λ and Hυ are the maximum Hertzian stress, specific film thickness and Vickers hardness, respectively.
一般社団法人日本機械学会の論文
1998-10-25