RELATION BETWEEN CAMBER AND WEDGE IN FLAT ROLLING UNDER RESTRICTIONS OF LATERAL MOVEMENT

In hot strip rolling, the curvature of the camber varies longitudinally along the strip, and seems to be caused by restriction of the lateral movement of the strip. Rough rolling is carried out under restriction of the lateral movement by edgers, and finish rolling is carried out under the restriction by front and/or back tensions. The relations between wedge and camber in flat rolling restricted by edgers and rolling tensions were investigated by laboratory rolling tests and analyses. In the middle portion of a strip where edge rolling and flat rolling are conducted simultaneously, the curvature of the camber is noticeably smaller than that in the head portion of the strip. In the finish train, the ratio of camber strain change to wedge strain change in the middle portion of a strip, where both front and back tensions are applied, is the smallest. But the flatness of the strip becomes distorted. It seems very difficult to reduce both camber and wedge simultaneously. Therefore, the camber and the wedge should be mainly controlled in the rougher train within a certain small level.