高负载粉末冶金齿轮选择性表面致密化

HIGHLY LOADED P/M GEARS PRODUCED BY SELECTIVE SURFACE DENSIFICATION

本文评述了当前高负载粉末冶金齿轮的发展状况。表明,经选择性表面致密化加工的粉末冶金钢齿轮,其齿的弯曲疲劳强度与接触疲劳强度都和常规钢的相应齿轮相同,完全可替代钢齿轮,如汽车变速器中的钢齿轮。特别是,描述了预成形件的设计与辗压后齿轮中的相应密度分布。最后,表明用选择性表面致密化制造的粉末冶金钢齿轮,既具有相应钢齿轮的使用性能,又具有巨大的节约生产成本的潜力。

This paper reviews the current development status of highly loaded P/M gears. It is shown that selective surface densified （SSD）P/M steel gears can sustain typical stresses in gears generated by the tooth and rolling contact fatigue at the tooth flank. Specifically, the design of the perform and the corresponding density distribution in the gear after rolling is described . Finlly ,it is shown that P/M gears manufactured by selective surface densification combine mechanical performance with a significant cost savings potential.