| 摘要 |
<p>PURPOSE:To reduce the thick part developed at a tube end, at the time of a reducing rolling to a tube stock by using a stretch reducer. CONSTITUTION:Vibration meters 25 are arranged to No. 1-No. 4 rolling mill stands in a stretch reducer, respectively and by the signal of the set vibration meter 25, the timings of rolling start and rolling end of the tube stock 28 are detected. From the timings of the rolling start and rolling end, changing timings of the rotating speed of caliver rolls built in No. 5-No. 26 rolling mill stands are calculated to control the rotating speed of the caliver rolls in No. 5-No. 26 rolling mill stands.</p> |
