目前拖拉机液压悬挂装置所用的油泵齿輪,相当于7級精度(有些要求更高),材料为18CrMnTi,是一种带軸的移距齿輪。它的热处理特点是:全部齿輪表面(包括齿輪两端面)都要求渗碳淬火,致使淬火工序用高頻法难于进行,只得整体加热淬硬,因之在热处理后的变形較大,并很难加以控制,这就不得不在淬硬以后进行齿形的精整加工。过去在小量的試 At present, the oil pump gear used in the tractor hydraulic suspension device is equivalent to 7-level accuracy (some higher requirements), and the material is 18CrMnTi, which is a kind of shift gear with shaft. Its heat treatment features are: All gear surfaces (including the gear both ends) require carburizing and quenching, resulting in the quenching process difficult to use high-frequency method, only the overall heating hardened, so large deformation after heat treatment, and it is difficult To be controlled, this had to tooth profile finishing after hardened. In the past a small amount of test