自動車トランスミッション用1.5Cr-0.2Mo焼結合金鋼歯車の表面転造特性と荷重負荷能力

概要

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A spur gear of the 1.5Cr-0.2Mo sintered alloy steel having a density of 7.55 g/cm3 was surface rolled using a high precision CNC form rolling machine of two-roller dies transverse type. The rolling process was designed to get good surface densification and tight tolerances on the gear tooth profile. After rolling, carburized and quenching treatment were conducted. Pore distribution of the rolled gear tooth was investigated. Running tests were carried out to determine a failure mode and load bearing capacity of this P/M gears. The test results show that the feasibility of using transverse form rolling for this high density Cr-Mo P/M material to obtain high precision gears with enough durability to replace case-carburized wrought steel gears made of typical Cr-Mo alloyed steel.