| 摘要 |
PURPOSE:To form the projection by the caliber exactly into the aimed shape and size, by specifying the elongation of flange per one pass of several passes in the early stage to be larger than specified times the elongation of web, by specifying the elongation of flange per one pass in the latter stage to be smaller than specified times the elongation of web, and by specifying the elongation of flange per one pass in the latter stage to be smaller than a specified value. CONSTITUTION:One of a couple of projections formed in the recess part at side edges of the flange of H-beam type sheet pile, etc., is roll formed by calibers of the horizontal roll and the vertical roll of a universal rolling mill through several passes. Hereupon, the pass schedule is arranged as follows; the elongation of flange per one pass of several passes in the early stange is specified to be larger than 1.03 times elongation of the web, and the elongation of flange per one pass in the latter stage is specified to be smaller than 1.03 times elongation of the web, and besides, the elongation of flange per one pass in the latter stage is limited to <=1.15. |
