| 摘要 |
PURPOSE:To heat only the body part of a large-sized backup roll by induction heating even if said roll is large in size by performing both treatments of stress relief annealing prior to hardening and heating for hardening by heating inductively only the body part of the roll. CONSTITUTION:Only the body part of a roll having, for example, 1,300mm. body diameter and 1,400mm. body length is inductively heated in the case of rehardening said roll, by which the temp. in the shaft part can be maintained low and the roll deformation is decreased even if the heating time increases as shown in the figure. More specifically, the twist in the bearing part can be suppressed within the permissible size in the stage of producing a new roll. The rehardening of the large-sized backup roll is thus made possible and the roll consumption is improved. |
