一、前言 钢的铸造性能较差,一般铸钢件不但要有较大的冒口,而且还要设置补贴以造成向着冒口的顺序凝固。这就使得铸钢件的出成率降低,而且金属补贴还要经氧气切割或机加工去掉从而消费了大黾的工时和能源,切割表面很不平整,加工时又对机床的寿命,精度和刀具都有较大的损害,所以用保温补贴取代金属补贴有较大的实际意义。为此,在研究保温冒口在 First, the preface Steel casting performance is poor, the general castings not only have a larger riser, but also set up subsidies to cause the order toward the riser solidification. This makes the casting rate of steel products reduced, and metal subsidies have to be cut by oxygen or machining to remove the big man of working hours and energy, the cutting surface is not smooth, processing and machine tool life, accuracy and Cutting tools have greater damage, so replacing the metal subsidies with thermal subsidies have greater practical significance. For this reason, studying insulation in the riser