| 摘要 |
<p>PURPOSE:To control accurately a tension of material without being influenced by disturbance by controlling the tension of the material to be rolled between stands by measuring, at two different points between the stands, the speed of the material changing its speed in inverse proportion to its own cross-sectional area. CONSTITUTION:Non-contacting type speed measuring devices 4, 5, utilizing laser for instance, are disposed to each inlet and outlet of rolling mills arranged continuously. A ratio of the speed V1 of a material 1 to be rolled measured by the device 4 which is disposed to the outlet of a stand 2 on the upstream side and the speed V2 measured by the device 5 disposed to the inlet of a stand 3 on the downstream side is obtained. Then a control for making V2/V1 constant is performed by changing the rotational speed of a stand 3 roll basing on said ratio.</p> |
