六立方米空压机连杆材质为球墨铸铁。为了避免在热节上产生缩松,原来在连杆的大、小头上都设置了冒口(图1(左))。这样,增加了切割冒口的工序,同时热处理变形严重,废品率高。为了防止热处理变形,我们改进了工艺,只在连杆的小头上设置一边冒口(图1(右)), Six cubic meters of air compressor connecting rod material is ductile iron. In order to avoid shrinkage in the hot section, the original large and small heads are set in the connecting rod riser (Figure 1 (left)). In this way, the process of cutting the riser is increased, meanwhile the heat treatment is seriously deformed and the rejection rate is high. In order to prevent the deformation of the heat treatment, we improved the process, setting only the riser on the small head of the connecting rod (Figure 1 (right)),