METHOD FOR COMPENSATING TENSION BETWEEN STANDS OF HOT FINISH ROLLING MILL

摘要

PURPOSE: A method for compensating tension between stands of hot finish rolling mill is provided to improve threadability and quality of rolling strip by setting and compensating target value of unit tension of the rolling strip passing through each stands of the finish rolling mill correspondingly to actual tensions. CONSTITUTION: In a method for compensating tension of a rolling strip between each stands of finish rolling mill, the method comprises first step of reading set values such as steel types, sizes and rolling data of strip from SCC (supervisory computer control) and judging whether all stands are in the metal in state or not through a load sensor installed at each stands; second step of calculating a unit tension average value between each stands using actual current results of looper driving system, set up values such as steel types and sizes from the SCC and rolling data required for calculating tension between the stands; third step of calculating unit tension compensation values respectively in cases that the unit tension average value (σ*) is greater than or less than a tension setting value impressed from the SCC as much as a certain value (α); and fourth step of outputting tension compensation value calculated in the third step and tension setting value compensated according to the calculated tension compensation value to the SCC, thereby impressing the outputted tension compensation value and tension setting value to looper current controller for controlling the looper driving system.