JPS5447852A - Rolling method for bloom by universal blooming mill - Google Patents

Abstract

PURPOSE:To roll the ingot into the bloom at high yield, by reducing the number of times of material turning and the number of pass, employing the universal rolling mill whose horizontal roll is provided with the caliber. CONSTITUTION:The initial breadth reduction is roughly given to the ingot by the smoothe first rolling face 3a, 3b, of the horizontal roll 1a, 1b, and then, the descaling is carried out. After 90 degrees turning the material, the reduction in the directions of thickness and breadth are simultaneously postively given to the material by the first rolling face 3a, 3b, of the horizontal roll and by the vertical roll 2a, 3b. Next, at the stage where the thickness and breadth of the material become nearly equal to the aimed values by above stated rolling works, the materials is 90 degrees turned, and the reforming reduction is given to the material by the second rolling face 4a, 4b, and the third rolling face 5a, 5b, which are all provided with calibers, of the horizontal roll 1a, 1b. In the last stage, one pass of the finish rolling is made, and the bloom with the specified dimension is obtained.