铸造生产中一个最普遍的问题,就是对于铸件的“补缩”。铸件上方设置冒口就是为了解决这个问题。国内现行的铸造工艺一般采用普通型砂冒口套,保温效果差,铸件工艺出品率低(约50％左右),不仅造成大量的冒口金属重复熔炼,浪费大量能源,而且常因缩孔,缩松造成铸件报废。高碳钢铸件就尤为突出。如果用绝热材料作冒口衬套,就可以减少热量的散失,从而可以延缓冒口内金属的凝固。铸件凝固时,冒口内金属依然呈液态,可以不断地补充铸件的收缩,因 One of the most common problems in foundry production is the “shrinkage” of castings. Setting riser above the casting is to solve this problem. The current domestic casting process commonly used ordinary sand riser sets, thermal insulation is poor, casting technology production rate is low (about 50%), not only caused by a large number of riser metal melting repeatedly, wasting a lot of energy, and often due to shrinkage, shrinkage Song caused casting scrapped. High-carbon steel castings are particularly prominent. If the adiabatic material for riser bushing, you can reduce the heat loss, which can delay riser metal solidification. Casting solidification, riser metal is still liquid, you can continue to complement the shrinkage of castings, due to