| 摘要 |
PURPOSE:To prevent dulling at both ends of a rolled stock after rolling and to obtain a desired flat shape by steepening the roll gap change rate between the end of bite in and the end of bite back of a material to be rolled. CONSTITUTION:The roll gap change rate per unit time duration during rolling is gradually decreased from the end of bite in of the material to be rolled up to the end point of the roll gap change in the central part and the roll gap change rate is set at the max. rate at the end of bite in at the cross rolling, etc. The roll gap change rate is similarly gradually increased from the start point of the roll gap change in the central part up to the end of bite back and the roll gap change rate is set at the max. rate at the end of bite back. The thickness of the material to be rolled is, therefore, larger the nearer both ends in the longitudinal direction of the material to be rolled after cross rolling so that the dulling generated at both ends can be decreased. As a result, the width shape and crop shapes at the front and rear ends of the rolled stock after finish rolling are improved.
|
