Variable thickness part-length control method of differential thickness steel plate

摘要

PURPOSE:To provide a simple and highly precise method by which the length of a variable thickness part is kept constant without being influenced by the change of rolling conditions such as a rolling load. CONSTITUTION:In manufacturing a differential thickness plate 2 by a hot rolling process, the rolling speed at the time of pass for the differential thickness rolling is set based on an idle running distance from the arrival at a differential thickness point P to the actual change of a roll gap, on the releasing speed of the roll gap and on the releasing quantity of the roll gap; a differential thickness rolling is thereby performed; the roll gap is made larger simultaneously with the arrival at the differential thickness point P; and also the rotation of the rolling roll is stopped. As a result, the length of the differential thickness part is able to be kept constant.