| 摘要 |
PURPOSE:To eliminate the defect at the end part of a material and to enable continuous rolling by forming the rear end part of a preceding material and the front end part of a succeeding one into prescribed shapes by pressing for thickness reduction, and overlapping both end parts for carrying out pressure welding or pressure spot welding. CONSTITUTION:The rear end part 10a of a preceding material which is passing through a rolling mill 1 is straightly cut by a flying crop shear 4 and is pressed 11 to have a prescribed stepped part by the front end of a die 31 of a press forming machine 3. Next, the front end 10b of a succeeding material delivered from a mill 2 is straightly cut by the shear 4 and pressed 11 to have a prescribed stepped part by the rear end of the die 31. The stepped parts at both ends are overlapped and pressed by the flat surface part 31 of the die to make the thickness of the overlapped part equal to the sheet thickness of the material. At that time, the welding by a spot welder 311 of a die is applicable. Further, the stepped part may be formed into a meshed shape by biting a recessing part with a projecting part with each other. In this way, the continuous rolling is performed by preventing the generation of end part defects and reducing the amount of cut-off scraps. |
