| 摘要 |
PROBLEM TO BE SOLVED: To provide a workroll for cold rolling capable of realizing stable and long hour continuous rolling by upgrading hardness of the inside of the workroll outer layer for cold rolling and by maintaining safe wear resistance till the discarding diameter after rolling use. SOLUTION: In the compound workroll manufacturing method for cold rolling that is manufactured after the outer layer composed of HIS system materials is formed around the core material composed of cast steel or forged steel by continuous tinkering buildup method, is (low frequency progressive induction) heated with heating coils provided in the up and down direction of the low frequency progressive induction heating device and is water-hardened and then, tempered, the compound workroll manufacturing method for cold rolling and the workroll characterized by the feature that, at the time of the low frequency progressive induction heating, controlling is executed so that the input power P1 by the heating coil in the upper stage is smaller P1 <P2 than the input power P2 in the lower stage, and also the inside temperature in the outer layer is so designed as to be higher than the surface temperature of the outer layer and then, water hardening is performed and high temperature tempering at 500-600 deg.C is executed.
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