| 摘要 |
PROBLEM TO BE SOLVED: To average and prolong service life of the roll by making wear in all calibers approximately equal to one another for the phenomenon in which the caliber of a thin diameter is most worn in a blooming rolling roll having a plurality of pieces of calibers for successively shaping into a round bar by rolling a rectangular continuous billet. SOLUTION: In calibers 2 composed of a first to a third square calibers the width of which is successively reduced on the outer periphery of one roll for successively blooming the cast billet 3 which is rectangular in the cross-sectional shape into a round bar 4, the blooming rolling roll 1 is constituted by arranging the second caliber 2b on the right side of the first caliber 2a, the third caliber 2c on the left side of the first caliber 2a one by one side by side, furthermore, two fourth octagonal calibers 2d the width of which is reduced and the diameters of which are thinned than those of the third caliber 3c on the left side of the third caliber 2c in parallel, and two fifth round calibers 2e the width of which is most reduced and the diameters of which are thinned on the left side of the fourth calibers 4d in parallel. COPYRIGHT: (C)2008,JPO&INPIT
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