| 摘要 |
PURPOSE:To stably control the sectional profile in a sheet rolling by determining an amount lapping a sheet width end part over a tapered part with a lateral flow coefficient in a rolling mill shifting working rolls having a tapered part each inversely. CONSTITUTION:The working rolls having a straight tapered part on one end of each long barrel are arranged in point symmetry and the working rolls are shifted inversely. In this case, the distribution of the lateral flow coefficients of a rolled sheet is required in advance and in this way the amount lapping the sheet width end part over the tapered part is limited to prevent the shear of the sheet and the sheet rupture by extreme middle waviness. The lateral flow coefficient is obtained by measuring the distribution of sheet thicknesses in the sheet width direction before and after the rolling and the distribution of the lengthwise elongation coefficient differences in the sheet width direction. Consequently, it is possible to control the sectional profile of the sheet without rupture and improve the yield. |
