Patent ID: 6240756
Filing Date: 2001-06-05
Classification: B21B

Abstract:
A path scheduling method for a tandem rolling mill having a plurality of mill stands to be controlled in conformity with a plurality of given conditions and a plurality of given constraints thereto to execute a given path schedule for a coil to be rolled by rolls of the plurality of mill stands to scheduled thicknesses at exit sides of the plurality of mill stands, with scheduled peripheral speeds of the rolls, the path scheduling method comprising the steps of:checking the plurality of mill stands each respectively for non-conformity with any of the plurality of given constraints;calculating correction amounts of normalized values of rolling forces of non-conforming mill stands, as necessary to meet any of the plurality of given constraints;correcting the normalized values by a maximal one of the correction amounts to provide corrected values as targets to be achieved at the non-confirming mill stands; andre-scheduling the given path schedule to achieve the targets by determining a plurality of re-scheduled thicknesses of the coil and a plurality of re-scheduled peripheral speeds of the rolls, both independently defining a mass flow of the coil to be constant at the plurality of mill stands.