我厂生产的导向轮轮辋(见图1),过去一直用热滚工艺。工艺过程如下:下料→滚圆→焊接→加热→滚压→缩圆。由于金属薄板经高温加热后,板材变薄,结果质量、刚性均有降低,一次合格率只占50％,废品率高达10％。而且该工艺方法能耗高,环境污染严重,劳动强度大。1980年我们将工艺进行了改进,由 Our factory production of the guide wheel rim (see Figure 1), the past has been using hot rolling process. The process is as follows: blanking → spheronization → welding → heating → rolling → shrinking. As the metal sheet after high temperature heating, sheet metal thinning, resulting in lower quality and rigidity, a pass rate of only 50%, the rejection rate of up to 10%. And the high energy consumption of the process, serious environmental pollution, labor-intensive. In 1980 we improved the process, from