采用无冒口铸造工艺获得需全部加工铣齿的100×100mm以上大断面健全铸件,国内尚无成熟的经验。为此在实际生产条件下,对重量500～4000kg、壁厚50～200mm的球铁件进行无冒口工艺试验,结果表明:工艺出品率在90％以上,并节约金属材料,简化工序,经济效益明显。我厂生产的球铁件,多数是断面80×80mm以上的铣齿蜗轮、水压机冲压模具、衬环类等铸件,重量为500～4000kg,要求内部组织致密,其牌号 The use of non-riser casting process to obtain all the milling teeth 100 × 100mm above the large cross-section sound castings, there is no mature experience. Therefore, under actual production conditions, the non-riser process test on ductile iron with the weight of 500 ~ 4000kg and the wall thickness of 50 ~ 200mm showed that the yield of the process was over 90%, the metal material was saved, the process was simplified, the economy Obvious benefits. I plant the production of ductile iron parts, most of the cross-section of 80 × 80mm milling gear, hydraulic press stamping die, lining ring and other castings, weighing 500 ~ 4000kg, requiring internal organization of dense, its grade