イオン窒化粉末焼結ローラの面圧強さに及ぼす硬化層深さと相対曲率半径の影響

概要

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In order to obtain the fundamental data of surface failure and surface durability of ion-nitrided sintered powder metal gear, the sintered rollers, which had two kinds of diameters 30 and 60 mm, and three kinds of hardened depth, were fatigue-tested under a sliding-rolling contact condition. The failure mode of all rollers was spalling due to subsurface cracks propagating parallel to the roller surface. The surface durability of the roller increased as the relative radius of curvature decreased and the hardened depth increased. The experimental results were discussed by the amplitude of the ratio of shear stress to Vickers hardness. The minimum occurring depth of the spalling agreed almost with the depth of peak amplitude of the ratio of orthogonal shear stress to Vickers hardness. The occurring depth of spalling became deeper as the relative radius of curvature increased. The hardness distribution influenced greatly the surface durability of ion-nitrided sintered powder metal rollers.
一般社団法人日本機械学会の論文
1999-01-25