我厂生产的东方红—40型拖拉机后轮辋(如图1所示),原来是用传统的工艺方法二道工序滚压成形的。国内同类型轮式拖拉机轮辋的生产工艺也都是采用二道工序滚压成形,横截面复杂的轮辋也有用三道工序滚压而成 I plant the production of Dongfanghong-40 tractor rear rim (shown in Figure 1), the original is the traditional method of rolling two processes forming. The same type of domestic wheeled tractor wheel rim production process is also used two rolling process, the cross-section of the complex rim is also useful to roll three processes