| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.1 ( September 1980 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Flatness and Profile Control in Hot and Cold Rolling of Steel Strip
Ikuo Yarita, Kunio Kitamura, Kenji Kataoka, Kichizaemon Nakagawa |
| Synopsis : One of the most important and principal qualities required of hot- and cold-rolled steel strip is good flatness and profile. Practical and theoretical studies into control systems on flatness and profile of the strip and their applications in full scale four-high mills have led to the following conclusions and to the establishment of control method. (1) A hot-rolled strip having such uniformed internal property as that from continuously cast steel is desirable to get a cold rolled strip with good flatness. And a hot-rolled strip having convex crown of 30-60Κ without surface abnormalities leading to ridge (so-called high spot) is suitable to get a good flatness and profile of cold-rolled strip. Furthermore, some cold rolling conditions are discussed in order to optimize work-roll camber, rolling schedule and roll bending force in cold rolling. (2) In hot rolling process, the crown control method using on-line draft distribution change among finishing trains and the edge drop improvement method by the use of trapezoid-cambered work roll have been developed successfully. |
| TextiPDF: 10p./466kbj |