| 摘要 |
PURPOSE:To enable side edges of a thickness differenced plate to be continuously and correctly cut, by turning the thickness differenced plate so that its step differenced part is parallelly positioned to a crop shear and cutting the both side edges by a side shear. CONSTITUTION:A point end 1C of a thickness differenced plate 1 is cut by a crop shear 14 in a shear line 10, and the cutting method, lowering a pair of measuring rolls 16A, 16B to be brought into contact with a cut section 1D and advancing the thickness differenced plate 1 to a position where the both rolls reach a step differenced part 1A, measures distances L1, L2 from two points P1, P2, separately placed in the cut section 1D, to the step differenced part 1A. And a control unit 20, driving an aligning device 22 so as to obtain a relation where L1=L2, turns a side of the point P2 about the point P1 serving as the reference till the step differenced part 1A comes to be placed parallelly to the crop shear 14. Thereafter, the method cuts both side edges 1B of the thickness differenced plate 1 by a side shear 18 successively the leading and trailing edges 1D, 1E by the crop shear 14. |
