Flatness Control of Complex Buckling in 12-High Cluster Mill Using One-End Tapered Work Roll Shifting Method - Advanced Control of Strip Flatness in Hard Steel Rolling I

摘要

A newly developed technology for controlling flatness of rolled strips in a 12-high cluster mill is described in this paper. For rolling hard materials such as stainless steel strips, a cluster-type mill with small-diameter work rolls (WRs) has been used generally. The small diameter WR is easy to bend and the strip flatness tends to get worse, so the 12-high cluster mill has many actuators for controlling strip flatness. For higher flatness control capability, a new actuating function is expected to control complex flatness patterns in addition to those existing actuators. Based on numerical analysis and laboratory experiments, it was found that a tapered WR shifting method is effective for expanding the capability of controlling strip flatness, particularly for complex flatness patterns of combined edge buckle and center buckle. To adjust the relative position between the strip and the WR taper area, newly developed equipment for shifting WR in the lateral direction was installed. The effect of this technology is confirmed in the actual 12-high cluster mill.