US 4,030,326 A · Gage control apparatus and method for tandem rolling mills

Abstract

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.

Claims15

Dependent claims

A gage control method for a tandem rolling mill including a plurality of individual mill stands one of which is determined as a particular stand, comprising steps of:

obtaining a thickness ratio between thicknesses of a plate to be rolled at the input and output sides of said particular stand by obtaining the thicknesses by detecting deviations of the thicknesses from desired thicknesses at the input and output sides of said particular stand,
obtaining a circumferential speed ratio between circumferential speeds of rolls of adjacent said mill stands by detecting the circumferential speeds of the rolls,
calculating a thickness of the plate at the output or input side of each of said stands other than said particular stand on the basis of said thickness ratio and said circumferential speed ratios,
obtaining a deviation of said calculated thickness from a desired thickness at the output or input side of each of said stands other than said particular stand, and
adjusting a screw-down position of each of said stands in dependence on said deviation.

2 more elements

A gage control apparatus for a tandem rolling mill including a plurality of individual mill stands one of which is determined as a particular stand, comprising:

means for detecting a deviation of a thickness of a plate to be rolled at least at the input or output side of said particular stand from desired thicknesses at said input and output sides,
means for obtaining the thicknesses of the plate at the input and output sides of said particular stand on the basis of said detection,
means for obtaining a thickness ratio between said thicknesses of the plate,
means for detecting a circumferential speed of a roll of each of said stands,
means for obtaining a circumferential speed ratio between the circumferential speeds of the rolls of adjacent said stands,
means for calculating a thickness of the plate at the output or input side of said stands other than said particular stand on the basis of said thickness ratio and said circumferential speed ratios,
means for obtaining a deviation of said calculated thickness from a desired thickness at the output or input side of each of said stands other than said particular stand, and
means provided in association with respective said stands for adjusting a screw-down position of each of said stands in dependence on said deviation.

5 more elements

Dependencies are inferred from the claim text.

Gage control apparatus and method for tandem rolling mills

Life of this patent

Gage control apparatus and method for tandem rolling mills

Life of this patent

Abstract

Claims15