CONTINUOUS ROLLING METHOD BY TANDEM MILL

摘要

PURPOSE:To make continuous rolling possible without the use of any large-sized loop cars in the stage of continuous rolling of strips with cold tandem mills by decelerating the rolling speeds of the mills considerably in the welding stage of rolled coils. CONSTITUTION:In the stage of continuous rolling of a strip with cold tandem mills consisting of the 1st stand ST1 - the 5th stand ST5, the outputs T1-T4 of the tension meters between the respective stands and the speeds of the main motors N1-N5 of the respective stands are inputted to a computer COMP. The control signals for correcting the speeds of the main motors N1-N5 are fed to said main motors and the control signals for correcting the screw-down positions to the screw-down position control systems S1-S5 of the respective stands. The actual deviations in thickness are detected with the X-ray thickness gages X1, X5 provided on the outlet sides of the 1st stand ST1 and the 5th stand ST5, and in accordance with these deviations, the motor speeds and screw-down positions of the stands are changed to drop the speeds during welding of the strip 1 down to about 5% of the rolling speeds, whereby the welding with a welding machine W and the shearing with a flying shear SH are made possible during continuous rolling without requiring any looper.