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我厂 QY16汽车起重机卷扬机减速箱第一级减速齿轮(模数 m=4)。原设计小齿轮用20CrMnTi 钢渗碳淬火,大齿轮用 ZG55Ⅱ钢齿表面淬火(HRC45～50)。由于大齿轮直径大(φ434.8mm),采用100kW 高频全齿加热淬火后变形大,必须磨齿修正齿形才有可能达到精度要求;若采用调质处理,不能满足设计要求。为此试采用离子渗氮工艺。齿轮采用离子渗氮变形小,但由于渗层浅,只适用于中轻负荷零件。离子渗氮齿轮到底能承受多大负荷?它的承载能力和渗层深度关系如何?我们参照渗碳层深度的计算方法,确定渗氮层深度并进行生产性实验,初步得到满意结果。
I plant QY16 truck crane winch reducer first gear (modulus m = 4). The original design pinion with 20CrMnTi steel carburizing quenching, gear with ZG55 Ⅱ steel surface hardening (HRC45 ~ 50). As the large gear diameter (φ434.8mm), the use of 100kW high frequency full tooth heated quenching large deformation, grinding teeth must be modified before it is possible to achieve accuracy requirements; if quenched and tempered, can not meet the design requirements. For this reason the use of ion nitriding process. Gear with ion nitriding deformation is small, but the shallow layer, only for light load parts. What is the relationship between the carrying capacity and the depth of the infiltrated layer? We refer to the calculation method of the depth of the carburized layer to determine the depth of the nitrided layer and carry out the productive experiment, and get the satisfactory result initially.