Casting method of metal mold centrifugal roll collar

The invention discloses a casting method of a metal type centrifugal roll collar, and belongs to the technical field of casting pouring, the outer layer is a wear-resistant layer, the inner layer is made of a low-carbon low-alloy steel material, and the casting method comprises the following steps: step 1, determining that chemical components of the inner layer, the outer layer and low-melting-point molten iron meet requirements; step 2, pouring outer-layer molten iron into a centrifugally rotating metal mold; thirdly, inner layer core molten iron is poured into a metal mold rotating centrifugally; 4, after the inner-layer molten iron is poured, a layer of low-melting-point molten iron is subjected to point pouring within a certain time; fifthly, a layer of low-melting-point molten iron is cast again within a certain time after the fourth step is finished; and step 6, normalizing and tempering the roll collar after all pouring. According to the method, after the inner-layer molten iron is poured, the low-melt