| 摘要 |
PURPOSE:To improve the rolling life of a roll and to manufacture the roll economically, by diffusion joining a rolling annular body, formed by sintered hard metal or high speed steel, etc. to a ring base body, formed by a low-carbon low-alloy steel consisting of a matrix of ferrite, under a hot hydrostatic pressure. CONSTITUTION:A composite roll 1 is constituted of rolling annular-bodies 2 having desired calibers, formed in its outer peripheral surface, and a ring base body 3 having the bodies 2, built in it by exposing their outer peripheral surfaces. The bodies 2 and the body 3 are diffusion joined together under a hot hydrostatic pressure. That is, the powder of high wear-resistant material to be formed into the annular body 2 for rolling, is press packed in the recessed grooves 4 formed along the outer peripheral surface of body 3, and is provided with canning treatment before HIP treatment, to obtain a composite ring stock 1', which is formed into a composite ring roll 1 by providing it with desired caliber work. In this way, a roll excellent in durability is economically manufactured. |
