| 摘要 |
<p>PURPOSE:To decrease the thickened amount in tube end parts by quantifying the thickened amount in the tube end part and using the quantified value in the method for controlling the wall thickness in the tube end parts in a stretch reducer of a seamless steel tube manufacturing line or the like. CONSTITUTION:In wall-thickness control in the tube end part for decreasing the thickened part which is generated in the tube end part of a tube 1 which is rolled with a stretch reducer 2, the the wall thickness over the entire length of the tube 1 is measured with a hot thickness gage 7 which is provided just behind the stretch reducer 2. The thickened amount in the tube end part is quantified from the obtained wall-thickness distribution and, by using the quantified value, the correction amount of the number of revolutions of roll at each stand of the stretch reducer for adding proper tension to the tube end part and the number of stands to be corrected are automatically corrected.</p> |
