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Mechanism of Attaining High Strength Sintered and Surface-rolled Gear and Merits of Its Application in Automotive Field
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机译：Mechanism of Attaining High Strength Sintered and Surface-rolled Gear and Merits of Its Application in Automotive Field
With the aim of expanding the application to automobiles, a study was conducted to determine the applicability of sintered parts to transmission gears that require high fatigue strength. Recent studies have reported that sintered and surface-rolled gears based on pre-alloyed steel powder can achieve fatigue strength equal to or higher than that of conventional wrought steel gears, but the mechanism that enables the former to achieve a fatigue strength higher than that of the latter has not been fully clarified. Hence, Kobe Steel has investigated the factors that may bring higher fatigue strength to sintered and surface-rolled gears in comparison with wrought steel and found that it is attributable to their highly compressive residual stress. Also studied were the advantages of applying sintered and surface-rolled gears. By optimizing the surface-rolling conditions so as to improve the tooth profile accuracy, the same contact pressure fatigue strength as that of the ground product can be obtained without any grinding, suggesting the possibility of eliminating the grinding process.
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