| 摘要 |
PURPOSE:To prevent generation of bottlenecks at a web part by equally distributing a necessary excess thickness to four corners of a web end section of a rolled stock so that ridge lines of the excess thickness are combination of plural arcs having different curvatures. CONSTITUTION:To find a limit value Wc1 of a width spreading amount of a web parallel part based on various prerequisites, a spread amount to be shared by an excess thickness is found by subtracting the limit value Wc1 from a target spread amount W and a necessary excess thickness amount is found based on the sharing spread amount and a web thickness of a product. The amount Wc1 is found based on relations between a web parallel part length l, a web thickness tw, a temp. distribution of a rolled stock, and a roll cross angle. The temp. distribution and the roll cross angle are determined by operating conditions of rolling. By finding the amount Wc1, the necessary excess thickness is found based on a relation of the target web spread amount W and a web thickness tw1 after rolling by tilted rolls. The found necessary min. excess thickness amount is equally distributed to four corners of a web end section. |
