| 摘要 |
<p>PURPOSE:To economically produce a shape steel for steel-made continuous wall having good rolled shape and quality and a horizontally asymmetric circu lar joints by setting a pass-schedule in a rough rolling process so as to satisfy a specific condition. CONSTITUTION:In the rough rolling process producing a rough rolled stock 21 having a horizontally asymmetric dog bone shape through a break-down mill BD, the asymmetricity of the rough rolled stock is increased successively to prevent the development of large warp. The pass schedule is specified and the ratio L1/L2 of L1 elongation rate of the short side of a flange per one pass to L2 elongation rate of the long side of the flange per one pass is made to be <=1.1 to suppress the warp. Succeedingly, the rough rolled stock is formed to almost a horizontally asymmetric H-beam through universal mills U1, U2 and edgers E1, E2 as the same way as the production of the approximately H-beam. Further, the flange parts are bent as an arc having the diameter larger than the product shape through a finishing mill F in a forming process, and formed to the circular joints to make the aimed product shape.</p> |
