System for controlling eccentricity of rolling mill

Claim 1

In an apparatus for controlling the eccentricity of a first roll of a rolling mill having upper and lower rolls, including a. rolling pressure sensing means (10) for directly sensing eccentricity of the roll, b. means including a first pulse generator (3) and a first counter (5) for sensing roll rotation, and c. means including a first pulse generator (3) driven by the roll and a first arithmetic unit (20) operable in synchronism with the pulses generated by said first pulse generator for providing factor signals (B and C) of the eccentricity and phase of the roll; the improvement which comprises d. means including a second arithmetic unit (22) for converting the factor signals into optimum factor signals (Bo and Co); e. means including eccentricity computer means (27), sensor means (8) responsive to the direction of rotation of the roll, and third arithmetic means (9) responsive to the slip angle between the upper and lower rolls for deriving corrected eccentricity and phase signals from said optimum factor signals; and f. means (11, 12, 13) responsive to said corrected eccentricity and phase signals for controlling the gap between the upper and lower rolls to correct the eccentricity of the roll by correcting the variation in thickness between said rolls, thereby to eliminate the variation in thickness of the rolled product caused by eccentricity of the roll.