| 摘要 |
PROBLEM TO BE SOLVED: To obtain a good coiled shape of a coil by compensating torque for accelerating/decelerating the part of a steel strip where is on the outlet side of the final stand of a finishing mill during the period in a state where the steel strip under rolling with the finishing mill is wound around the shaft of the mandrel of a coiler and not wound around the shaft of the mandrel of the coiler with the mandrel of the coiler. SOLUTION: The value ofαis determined by the equation I (α: the reference value of acceleration/deceleration, VR: the speed of the rolling roll at the final stand of the finishing mill for the steel strip, dVR/dt: the time-derivation of speed, f: the forward slip; f>1, df/dt: the time-derivation of the forward slip, t: the time). The necessary torque THRT of the mandrel of the coiler is determined by the equation II (M: the weight of the part of the steel strip where is on the outlet side of the final stand of the finishing mill and not coiled with the mandrel of the coiler, D: the diameter of the part of the steel strip where is wound around the shaft of the mandrel of the coiler) and compensated. By compensating the acceleration of the part of the steel strip where is not into the coil, the variation of coiling tension is reduced.
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