METHOD TO CONTROL SCHICKNESS FOR ROLLING MILL

摘要

Gage control apparatus and methods for tandem rolling mills are disclosed which are based on the low of constancy of mass flow. The apparatus and methods are attained by the discovery of the fact that the forward slip ratio of a mill stand varies as a linear function of the reduction ratio particularly when a plate material is rolled under relatively low tension. A ratio between thicknesses of the plate at the output and input sides of a particular stand of the tandem rolling mill and a ratio between circumferential speeds of rolls of the adjacent stands are used to calculate a thickness of the plate at the ouput or input side of each of the stands other than the particular stand. Each of the stands other than the particular stand is adjusted in its roll gap in accordance with a deviation of the calculated thickness from a desired thickness so as to cancel the deviation.