| 摘要 |
PURPOSE:To extremely effectively control the size, shape, etc., of the U-shaped sheet pile, by causing a speed unbalance between the successively arranged rolling mills, and by giving a tension in the rolling direction, at rolling the U-shaped sheet pile using a two-high rolling mill. CONSTITUTION:The material (a) is heated by the heating furnace F and is continuously rolled in each of rolling mills 1, 2, 3, S1, S2, S3, S4. For example, between the rolling mills S1 and S2, the rotational speed of the rolling mill S2 is kept constant (about 2.7m/s), and the rotational speed of the rolling mill S1 is varied. Until the speed unbalance is up to about 6%, as the speed unbalance increases, the thickness of only the hooked shoulder part is straightly reduced, leaving other parts in about same thickness and about same shape. As a result, the thickness of the hooked shoulder part can be controlled to an extent of 0.5mm.. |
