B - Operations – Transporting – 21 – B
Patent
B - Operations, Transporting
21
B
341/42, 80/48
B21B 19/10 (2006.01) B21B 37/78 (2006.01)
Patent
CA 1180423
ABSTRACT OF THE DISCLOSURE A control method for screwing down rolls in a reeling mill wherein the desired amount of reduction in the wall thickness of a seamless pipe being rolled is determined for the longitudinal direction of the pipe from the outside diameter and average wall thickness of the pipe being supplied to the relling mill and the desired outside diameter of the pipe leaving the reeling mill, the actual amount of reduction in the wall thickness of the pipe being rolled is calculated for the longitudinal direction of the pipe from the temperature of the pipe being supplied to the reeling mill and the rolling torque of a rolling motor, and the degree of screwing down of the reeling rolls is controlled so that the actual amount of reduction in wall thickness is equal to said desired amount of reduction in wall thickness, as well as an apparatus for effecting this method. According to this method and apparatus, the torque of the rolling motor is measured continuously to detect the actual amount of reduction in the wall thickness of the pipe at particular times, and so, only one value is determined for the amount of correction of the gap between the two reeling rolls when the actual amount of reduction in wall thickness deviates from the desired amount of reduction in wall thickness. This achieves very reliable control operation - 1 - without hunting or delay effect. The control method of this invention takes into consideration the change in the temperature in the longitudinal direction of the pipe being supplied to the reeling rolls, so the pipe leaving the reeling mill has a uniform outside diameter in the longitudinal direction, and as a particular advantage, the outside diameter at both ends of the pipe can be controlled to become equal to the desired value. - 2 -
383839
Funyu Yutaka
Kanno Toyoji
Masuda Toshikazu
Sakurada Kazuyuki
Togashi Fusao
Kawasaki Steel Corporation
Riches Mckenzie & Herbert Llp
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