JPS5639119A - Operating method for leveler - Google Patents

Abstract

PURPOSE: To make the set point of the rolling reduction to be substantially unchangeable, and to prevent the camber from changing on the run-out side, by changing the rolling reduction in the direction opposite to the direction of the change of crowning, at the same time as the set point of the crowning is changed.

CONSTITUTION: When the leveler is under the condition of "Manual operation ON", the fine adjustment factor α specific to the material to be straightened is set in the leveler; in which, α is included in the formula ΔA=α×ΔC, for deciding the correction ΔA of the rolling reduction against the change ΔC of the crown. Next, the material is passed the leveler, and the initial values of the rolling reduction, the crown, the tilt, are set in the leveler. After that, the leveling operation is carried out under the condition "Automatic operation ON". When the distortion of the material changes, the crowing is manually adjusted, and at the same time, the rolling reduction is automatically changed opposite to the direction of the crowing operation as much as the amount of substantial influence of the crowing on the rolling reduction, depending on the presetted fine adjustment factor α. As a result of this automatic correction function, the set point of the rolling reduction becomes substantially unchangeable, so that the fluctuation of the quality can be dissolved.

COPYRIGHT: (C)1981,JPO&Japio