| 摘要 |
PURPOSE:To shorten the time requirement in threading the steel sheet through the rolling stand, and to remarkably improve the rolling efficiency, by previously determining the roll gap in which the finishing size of the steel sheet satisfies the common difference, and by threading the steel sheet through the roll gap kept at the maximum of above predetermined values. CONSTITUTION:The rolling line L, comprising plural cold rolling rolls 1, rolls the steel sheet 2; hereupon, the roll gap So of each roll 1 is preset by the controller 3 before feeding the steel sheet 2. The controller 3 is actuated by the CPU4 which prestores the values of formulas I, II, (a), (b), (c) and the specifications of the steel sheet 2. Besides, the draft percentage of each roll 1 is distributed so as to realize the uniform distribution of draft percentages or the uniform distribution of load factors, and the formula I is applied to the draft percentage of each roll 1. By thus widening the roll gap So of all rolls 1 to the possible maximum, the feeding speed of the steel sheet 2 can be remarkably increased, the rolling load of the roll 1 is lightened, and the steel sheet 2 can be beautifully finished. In the formulas, P is the rolling load, K is the mill stiffness, (h) is the aimed thickness of the steel sheet 2, and alpha is the correction factor. |
