| 摘要 |
PURPOSE:To prevent a sheet to be rolled from generating camber by adjusting an angle of pass line to an optional angle, and to obtain a well finished product, by providing an adjusting device of pass line either to the outlet side or to the inlet one of an offset multistage rolling mill. CONSTITUTION:An angle formed between a tangent line touching at a contact point P and a horizontal line passing through the point P is previously calculated basing on the offset quantity of a small diametral work roll 2' from a large diametral work roll 2. Next, a piston rod of a cylinder 10 of a pass-line adjusting device 12 is stretched out to push a guide roll 8. And then, an angle between the horizontal line and a sheet to be rolled, i.e. pass line angle theta is made to approximately coincide with the angle between the tangent line and the horizontal line. When a sheet 6 is rolled in this way, rolling forces acting on both surfaces of the sheet 6 are equalized by the upper and lower work rolls 2, 2' made to have different diameters respectively and made to offset, therefore the sheet 6 is rolled without generating camber and lubrications at the upper and lower surface are equalized. |
