Impact of main drive system of 5Â m wide and heavy plate mill on screw-down load deviation

Universal couplings cause additional moments on the sleeve shaft of work roll. The problem becomes more obvious in the wide and heavy plate mill due to the large tilt angle and the great rolling torque, which may affect the deflection of roll system and the screw-down load deviation. Aiming at the structural characteristics of the drive system of a 5000 mm wide and heavy plate mill, additional moment models acting on the work roll are established, and the influence coefficients of the additional moment of the main drive system are obtained according to Mohr integral method. The screw-down load deviation affected by the additional moment is calculated based on the influence function method. Results show that the additional moment of the work roll drive end has little effect on the screw-down load deviation. And the fluctuation period of the additional moment is 180° with the input shaft rotating. The additional moment enlarges with the tilting angle increasing. If the tilt angle is equal to 4.82°, the vertical additional moment is about 8.5% of the output torque of motor shaft, while the horizontal additional moment is about 4.2% of that.