Method and casting/rolling system for casting and rolling a continuous strand material

A method for operating a casting/rolling system for casting and rolling a continuous strand material, wherein the casting/rolling system comprises:

• a strand casting machine and a rolling line arranged downstream of the strand casting machine,
• wherein the strand casting machine is provided with a chill-mold;
• wherein the rolling line is provided with n roller frames, wherein n=1 through N, provided with respective drives for the roller frames, a pass sequence plan model and a drive controller for controlling the drives of the roller frames;
• and
• wherein the method comprises the following steps:
• controlling the drive for rollers of a first roller frame, wherein n=1, by the drive controller in response to a target value specification of the pass sequence plan model;
• wherein the strand casting machine is further provided with at least one strand guide arranged downstream of the chill-mold and upstream of the first roller frame with strand guide rollers and at least one drive for driving at least one of the strand guide rollers, a strand casting machine drive model and a strand guide roller drive controller, wherein control over the at least one drive of the at least one strand guide roller is performed via the strand guide roller drive controller in response to a target value specification of the strand casting machine drive model;
• wherein the pass sequence plan model sets as a target value specification a target rotational speed for the drive of the first roller frame, n=1, of the rolling line, the drive of the first roller frame of the rolling line being the only drive of the strand casting machine or rolling line having a set target rotational speed, and wherein the pass sequence plan model only sets as a target value specification a target torque for drives of roller frames of the rolling line only where n=2 through N, being downstream of the first roller frame;
• and
• the strand casting machine drive model sets as a target specification a target torque that is set in advance for the drive of the at least one driven strand guide roller, wherein the at least one driven strand guide roller is not provided a target rotational speed,
• wherein the detection of rotational speeds is omitted for the strand guide rollers and the rollers of the roller frames,
• wherein a thickness of the strand material at an exit of the strand guide and a casting speed are input as variables in the pass sequence model for determining a target torque Mi for drives of the rolling line where n=2 through N and the thickness of the strand material at the exit of the strand guide and the casting speed are input as variables in the strand casting machine drive model for determining a target torque Mn for the drive of the at least one driven strand guide roller.