1前言为了提高产品的市场竞争能力，近两年来，我们对后桥壳加工工艺进行了研究和改进，并将改进后的工艺用干生产实践，产生了显著的社会经济效益。2后桥壳的工艺改进在原工艺中，后桥壳琵琶包槽型横截面的宽度为80mm，见图1，而桥壳加工后，桥壳中心至加强环端面的距离是52mm 1 Introduction In order to improve the market competitiveness of products, the past two years, we have carried out research and improvement of the rear axle shell processing technology, and the improved process with dry production practices, had a significant social and economic benefits. 2 rear axle shell process improvements In the original process, rear axle shell pipa package groove cross-sectional width of 80mm, shown in Figure 1, and the bridge shell processing, the center of the bridge shell to strengthen the end ring distance is 52mm