普通的铸钢件和球铁件的冒口,朴缩效率只有14～20％,铸件工艺出品率一般在50～70％左右,消耗钢水多,成本高。几年来,我们用蜂窝煤型热保温冒口取代普通冒口,经生产验证,表明在保证铸件质量的前提下,冒口补缩效率可达50％左右,工艺出品率提高20％～23％,冒口体积缩小65％～75％。每吨铸件成本下降约30％,经济效益明显。现将试验情况简介如下: Ordinary castings and ductile iron riser, simple shrink efficiency of only 14 to 20%, castings production rate is generally 50 to 70%, consumption of molten steel, high cost. Over the past few years, we use honeycomb thermal insulation riser instead of ordinary riser, the production verified that casting quality assurance under the premise of riser shrinkage efficiency of up to about 50%, craft production rate increased by 20% to 23% Riser volume reduced 65% to 75%. Casting costs per ton down about 30%, significant economic benefits. Now the experimental situation is as follows: