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在铸钢生产中铸钢的液态收缩较大。铸件设置冒口的主要作用在于凝固期间液态金属对铸件“补缩”。普通冒口采用与铸型相同的造型材料,由于二者的传热性能是相同的,所以液态金属在冒口中维持时间较短,补缩效率很低。其缩孔体积仅占整个冒口体积的14％左右,其中10％左右用于补缩铸件。因而冒口的绝大部分金属被消耗掉,铸件工艺出品率一般只有50～65％,铸件内部也往往由于补缩能力差而出现缩孔、缩松等缺陷。提高冒口的补缩效率就是设法减少冒口的热损失,使冒口钢液维持一定时间的液体
Cast steel in the production of liquid steel shrink larger. The main role of casting set riser lies in the liquid metal during casting solidification “casting”. Ordinary riser using the same molding material with the mold, the heat transfer performance of the two are the same, so the liquid metal in the riser to maintain a shorter time, the low efficiency of feeding. The shrinkage volume of the riser only accounts for about 14% of the volume, of which about 10% for shrink casting. Therefore, the vast majority of riser metal is consumed, the casting process yield is generally only 50 to 65%, the casting internal often shrink shrinkage due to poor shrinkage and shrinkage and other defects. Increasing the efficiency of feeder riser is trying to reduce the riser’s heat loss, riser liquid to maintain a certain time of liquid