Patent ID: 8127580

Claim:
A method for levelling a flat product in strip or sheet form in a levelling machine, the method comprising the following steps: providing a fixed support stand, providing two levelling trains with parallel rollers respectively positioned above and below said strip or sheet, providing devices for adjusting an intermesh of the rolls, providing motorization means for transmitting torques to the levelling rolls, providing means for at least global measurement of the torques transmitted to the levelling rolls by the motorization means, providing a pre-adjustment device giving at least one velocity reference value for the motorization means of the levelling rolls and for an electric torque value required for plastic deformation of the product, measuring at least the global value of the torques transmitted to the levelling rolls, determining a real value of the torques used for plastic deformation of the product, comparing the determined real value with the torque reference value given by the pre-adjustment model, and acting on the adjusting devices to adjust the intermesh of the levelling rolls to maintain the determined torque value used for plastic deformation of the product equal to the reference value given by the model.