ALGORITHMS FOR SPEED AND STRETCH CONTROL OF THE MAIN DRIVES OF A STRETCH-REDUCING TUBE MILL

This paper shows the drive solution, the speed references calculation and the automatic control of all speeds range for the assembly of the 24 stands belonging to a stretch-reducing mill for seamless pipes. The correlation between the speed control and the stretching control of the rolled pipe is also shown. The experimental results are real data associated to the most recent project that has been executed at a seamless pipe plant in Poland and China.