This paper deals with the experimental study of the multivariable control system for bar and wire rod rolling. The control objective in the rolling is to maintain the interstand tension and output height and width of bar and wire rod product as prescribed. Based on the optimal regulator theory, a simultaneous control system of tension control and Gauge Meter AGG (automatic gauge control of exit height) is introduced. The control law is implemented by the output vector feedback and the partial state vector feedback. To evaluate the control performance, step responses due to input diameter and input temperature change are measured on a 4-stand tandem model mill. From the experimental results, the validity of the present control system is confirmed.
