| 摘要 |
PURPOSE:To confine a shaping cutting only to a part required for laser cutting, to reduce time for laser cutting and to shorten time in the continuous rolling stage of hot rolled stock by confining the shape of shear cutting in order to efficiently execute the shaping cutting with a laser beam. CONSTITUTION:In this continuous rolling method by which the rear end part of a preceding rolled stock is butt-joined with the tip part of the succeeding rolled stock on the finishing inlet side in a rolling mill of a hot rolling device then the joined rolled stocks are continuously rolled, the end parts of the preceding stock and succeeding stock are cut into a curved shape with a curved blade shear having the radii R of curvature so that the max. gap between both materials is <=1/5 of bar thickness when the preceding stock 1a is butted on the succeeding stock 1b after cutting the rear end part of the preceding stock and the tip part of the succeeding stock. After that, both end parts in the direction of width are respectively formed by cutting the parts into the length of 4-10% of the entire width of bar with the laser beam, the preceding stock 1a is butted on the succeeding stock 1b and, the parts where are formed by cutting is joined by welding with the laser beam, then the hot rolled stock is pressure- welded and continuously rolled. |
