| 摘要 |
PURPOSE:To obtain a cast roll for rolling which is improved in abrasion resistance particularly by fining of the texture in the layer on the surface in the body part of the roll to be used for rolling in the stage of casting the roll, by passing a cooling medium in the hollow part in a metal mold and cooling the metallic mold quickly from the inside. CONSTITUTION:A metal mold which consists of copper or the like and is formed internally with a hollow part is prepared in the above-described casting. In the stage of casting a roll, a cooling medium such as water is passed in said hollow part to cool the metal mold from the inside quickly. An essential requirement in this case is to cool the molten metal quickly at 6-20mm./sec cooling rate. Such cooling rate for the molten metal is attained suitably by 3-5kg/cm<2> cooling water pressure and 100-1,000l/sec flow rate when water is used as the cooling medium. As a result, the molten metal is quickly cooled and solidified without the decrease in the life of the metallic mold, by which the solidified texture, more particularly the carbide formed in the stage of solidification is fined densely and the cast roll for rolling having high resistance to abrasion is obtained. |
