| 摘要 |
<p>PURPOSE:To eliminate the variation of the wall thickness of a steel pipe by using a forward slip obtained by correcting a reference forward slip by a torque change, and outputting a control output gain used for changing a roll peripheral speed based on the deviation from an aimed value of tension, to correct the peripheral speed in controlling the rolling tension of a pipe material. CONSTITUTION:A pulse counter 24 which inputs a pulse signal 20 of the number of revolutions of a roll 14k, starts by a biting signal outputted from a load cell 22k and stops by a biting signal outputted from a load cell 22k+1 to output the integrated number of pulses C. An arithmetic device 26 obtains a forward slip fk by correcting the reference forward slip fok of a material 10 to be rolled, obtained from the number of pulses C, by using the veriation portion DELTAGk of a rolling torque to decide a control output gain (g) used for changing a roll peripheral speed Vrk in accordance with a tension deviation DELTAtauk. The control amount DELTAVrk of roll peripheral speed is outputted by using the gain (g), to correct the roll peripheral speed with the aid of a control device. Accordingly, the material 10 is rolled into the uniform wall thickness without causing the deviation of the biting tensions at the front and rear parts, to improve the finish yield.</p> |
