During ausform finishing process of hardened gears, there is plastic displacement of metal on the tooth surface and the distortion of tooth profile.
在齿轮热滚挤加工中，轮齿上的金属在强制挤压力的作用下沿齿面产生塑性流动，使齿形发生变化。
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Therefore, the conventional heat treatment process after forging can be replaced by the new ausform hardening process, to save energy and improve production efficiency.