イオン窒化粉末焼結ローラの面圧強さに関する研究 : 粉末粒子径の影響ならびに面圧強さと硬さの関係

概要

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In order to evaluate the surface durability of ion-nitrided sintered powder metal rollers, the influence of particle diameter on the surface durabilities of the sintered rollers was investigated under a sliding-rolling contact condition. The failure mode of the rollers was spalling due to subsurface cracks. The surface durability of the roller became higher as the particle diameter became smaller. The spalling failure depth agreed almost with the depth where the amplitude A(τ_<yz>/Hν) of the ratio of orthogonal shear stress to Vickers hardness became peak. The surface durability was evaluated using the amplitude A(τ_<yz>) of the shear stress and the hardness Hν at the peak amplitude of A(τ_<yz>/Hν). The relationship between A(τ_<yz>) and Hν of the sintered rollers and gears having medium pore distribution was given by an equation A(τ_<yz>)=0.174Hν^<1.13>. However, the relationship of the sintered rollers and gears having different pore distribution did not conform to the above equation. Therefore, it could be said that the surface durability of the sintered roller depended on the pore distribution.
一般社団法人日本機械学会の論文
2001-06-25