| 摘要 |
PURPOSE:To improve the productivity of a shape steel by conducting electric power and heating the drawing-out raw material to a specific temp., hot-rolling into a hoop material having spread width of the shape steel and forming a projecting line at one side and successively, continuing a bending process and a finish-rolling process with forming rolls. CONSTITUTION:A wire rod wound in coil-shape is used to the raw material 12 and this raw material is drawn out and heated to 900-1100 deg.C by conducting the electric power. The raw material 12 is hot-rolled into the hoop material 24 having spread width of the shape steel and forming the projecting line at the one side on the bent line. The hoop material 24 is bent at a prescribed angle in the bent line while forming the projecting line to the outside with the forming roll 26 and successively, the process for finish-rolling the bent material is continued. By this method, the wire rod wound in the coil-shape is used as the raw material, the weight of the raw material is increased, and the rolling yield and productivity are improved. Further, as the shape steel is continuously manufactured by form-rolling the hoop material, on which the projecting line is formed by with a strong pressure working, with the forming roll, the excellent productivity is obtd. |
