METHOD FOR CONTROLLING HOT SIZING OF SEAMLESS STEEL TUBE

摘要

PROBLEM TO BE SOLVED: To provide a control method of hot sizing for finishing the outside diameter of a seamless steel tube into a complete round.;SOLUTION: The locally incomplete roundness is prevented by controlling the motor current value I and/or the number N of revolutions of a rotary sizer within the range of the formula, Tmin ≤ 0.985VI/N ≤ Tmax in the control method of the hot sizing of the seamless steel tube. In the formula, Tmax is a × (the outside diameter of a steel tube which is rolled with the rotary sizer) + b × (the thickness of the steel tube which is rolled with the rotary sizer) + c; Tmin is a constant; V is the voltage value of the motor of the rotary sizer; I is the current value of the motor of the rotary sizer; and N is the revolution of the motor of the rotary sizer.;COPYRIGHT: (C)2005,JPO&NCIPI