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过去几十年,用于汽车的粉末冶金零件不断增长,对零件性能的要求也越来越高。汽车用的变速器齿轮的形状复杂,按照齿轮质量要求(DIN,ISO,AGMA等)几何精度很高,按齿面与齿根的耐久性要求力学性能也很高。对于制造复杂形状零件,粉末冶金法对控制成本很有效。通过增加对齿的选择性致密化,在增加很少费用下就能满足精度与力学性能要求。由压制、烧结、碾压致密化及最后热处理组成的工艺路线,可评估用粉末冶金制造的变速器齿轮的可行性。在研究中所用的螺旋齿轮与正齿轮,对致密化及所得到的齿轮的质量与齿根疲劳都进行了试验。
Over the past few decades, the powder metallurgy parts used in automobiles have been increasing, and the requirements for the performance of parts have also been increasing. The shape of gearbox for automobile is complicated. According to the requirements of gear quality (DIN, ISO, AGMA, etc.), the geometrical precision is very high. The mechanical properties are also required by the durability of tooth surface and root. The powder metallurgy method is very effective at controlling costs for the manufacture of complex shaped parts. By increasing the selective densification of the teeth, accuracy and mechanical performance requirements can be met with little additional cost. The process route consisting of pressing, sintering, compacting and final heat treatment evaluates the feasibility of transmission gears made from powder metallurgy. The helical and spur gears used in the study were tested for densification and resultant gear quality and root fatigue.