论文部分内容阅读
为提高抽油机减速器齿轮铸件的机械性能，提出以Sn代替Mo作为合金元素，并通过试验确定了合理的Si、Cu、Sn的加入量。指出Si加入量应控制在1．9％－2．1％范围内，同时加入0．36％～0．9％的Cu和0．025％～0．07％的Sn，可保证球铁的强度和延伸率都满足QT700－2的要求。鉴于试件与实际铸件的表面硬度有一定的差值，为提高铸件表面硬度，进行了余热正火试验，并给出了铸件在铸型内的时间－冷却温度曲线。最后根据球铁化学成分的选择结果，进行了齿轮生产试验。
In order to improve the mechanical properties of the gear castings of the reducer, a new method was proposed, in which Sn was substituted for Mo as the alloying element, and reasonable amounts of Si, Cu and Sn were determined through experiments. It is pointed out that the amount of Si added should be controlled within the range of 1.9% -2.1%, with 0.36% ~ 0.9% Cu and 0.025% ~ 0.07% Sn added, The strength and elongation meet the QT700-2 requirements. In view of the difference between the surface hardness of the test piece and the actual cast piece, in order to improve the surface hardness of the cast piece, the afterheat normalizing test was conducted and the time-cooling temperature curve of the cast piece in the cast piece was given. Finally, according to the results of the selection of the chemical composition of ductile iron, the gear production test was carried out.