| 摘要 |
PURPOSE:To prevent biting defects and to surely hold a sufficient percentage reduction by specifying a friction coefficient of the roll surface in a non-driven vertical rolling mill. CONSTITUTION:A continuous rolling mill 10 is composed of driven horizontal mills 1, 3, 5, 7 and non-driven vertical mills 2, 4, 6. A rolled stock 20 heated to a required temp. by a heating furnace is hot rolled by the mill 10. In that case, by bringing a friction coefficient of the roll surface of the mills 2, 4, 6 to be >=0.45, biting defects of the stock 20 are prevented, and by bringing a biting angle of the stock 20 to be larger, a sufficient percentage reduction is kept even in the mills 2, 4, 6. As the result, the total equipment scale is reduced. |
