Study on the Behavior of Rotating Material Around the Pass Line at Exit with Caliber-Rolling for Wire and Rod

Rolled metal wires and rods often exhibit tilting, the material is rotated around the pass line. When material is rolled with tilt at the entry side, torsion of the cross section occurs due to asymmetric deformation during rolling. Torsion may result in reduced shape accuracy and surface defects. In previous research, by comparing the tilt angle of specific points on the surface of the material (e.g., the corner point of a square cross section) at the entry(θs) with that at the exit(θe), tilting was evaluated as either restoration (θs > θe) or overturning (θs < θe). This revealed the influence of tilting by pass sequence (e.g., diamond-square, oval-round, square-oval), or rolling conditions (e.g., roll diameter, friction coefficient). On the other hand, it is known that metal rolled with tilting rotates after rolling. This is important because this rotation becomes the tilt angle at the entry to the next rolling. In this work, the rotation at the delivery side by metal rolled with tilting was investigated by both experiment and FE simulation and was considered in relation to asymmetric deformation behavior of the roll bite.