塞盖零件材料为杜拉铝Ly12,我厂原工艺采用棒料切断后车出环形槽及内外圆,再铣成椭圆形法兰盘等工序。劳动强度大,生产率低,切削余量大,材料消耗多,质量也不稳定。1974年我厂冷挤压组分析该零件可进行冷挤成形,材料选用3.5～4毫米厚的Ly12板 Seagull parts material for the Du Lvalu Ly12, I used to cut off the original factory car out of the annular groove and the inner and outer circle, then milling into oval flange and other processes. Labor intensity, low productivity, large cutting allowance, material consumption, quality is not stable. In 1974, our factory cold extrusion group analysis of the parts can be cold extrusion, the material selection 3.5 ~ 4 mm thick Ly12 plate