| 摘要 |
PROBLEM TO BE SOLVED: To provide a grooved rolling roll group or the like by which defective entry at the fourth stand and roll slip are effectively prevented. SOLUTION: This grooved rolling roll group is the grooved rolling roll group which is used for a mandrel mill in each stand of which a plurality of grooved rolling rolls R are arranged and the distance S2 between the center O' of curvature of the groove bottom profile of the grooved rolling roll R arranged in the second stand and the center O of the groove and the distance S4 between the center O' of curvature of the groove bottom profile of the grooved rolling roll R arranged in the fourth stand and the center O of the groove are set so as to satisfy formula (1). S2×0.40< S4< S2×0.60. COPYRIGHT: (C)2006,JPO&NCIPI
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