Automatic thermal crown control of strip mill rolls

Abstract

Abstract A SYSTEM FOR CONTROLLING THERMAL CROWN OF STRIP MILL ROLLS. THICKNESS VARIATIONS OR OFF-FLATNESS OF THE ROLLED STRIP ARE SENSED AT A PLURALITY OF ZONES ACROSS THE STRIP, AS WELL AS EXCESSIVE BENDING FORCES AT THE ROLL JACKS. ZONES INSIDE THE EDGES OF THE STRIP ARE CONTROLLED PRIMARILY IN ACCORDANCE WITH THICKNESS VARIATIONS OR OFF-FLATNESS, WHILE ZONES OUTSIDE THE EDGES OF THE STRIP ARE CONTROLLED PRIMARILY IN ACCORDANCE WITH EXCESSIVE BENDING FORCES. ZONES AT THE EDGES OF THE STRIP ARE MANUALLY CONTROLLED. MANUAL AND AUTOMATIC CONTROL MAY BE CONCURRENTLY UTILIZED. PROVISION IS MADE TO ENSURE THAT COOLANT FLOWS ARE NOT CHANGED WITHIN A PREDETERMINED TIME FOLLOWING A PRECEDING CHANGE, EXCEPT FOR CHANGES IN ACCORDANCE WITH EXCESSIVE BENDING FORCES AT THE ROLL JACKS. THE DETECTION OF MAXIMUM AND MINIMUM STRIP THICKNESSES OR CONDITIONS OF OFF-FLATNESS FOR BOTH ZONES TO WHICH COOLANT IS BEING SUPPLIED AND ZONES TO WHICH NO COOLANT IS BEING SUPPLIED IS UTILIZED WITH COOLANT FLOWS BEING VARIED TO THESE PARTICULAR ZONES.

Inventors

• 👤 Olivio G Sivilotti

Bibliographic Details