| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.24 ( April 1991 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Automatic Flatness Control System in Tandem Cold Rolling Mill for Ultra-thin Gauge Strip Teruhiro Saito, Takeo Ohnishi, Tomio Komatsu, Sadayuki Miyoshi, Hideki Kitamura, Masanori Kitahama |
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Synopsis : In April 1988, a new flatness control system was installed at a 6 stand tandem cold rolling mill that produces mainly ultra-thin gauge steel sheets at the No.1 Cold Rolling Plant of Chiba Works. This new automatic flatness control consists of two actuators and a contact roll type sensor. The two actuators were specially selected for this system by the authors through accurate simulating analysis of the effect of flatness control. One was an increasing and decreasing work roll bender, and the other a selective zone-controlled roll coolant system which adjusts the distribution of the coolant flow along the strip width. This system has proved its excellent control over not only a simple shape (i.e. center buckle or edge wave) but also a complex shape such as quarter buckle. As a result, the maximum steepness of the strip has been reduced to less than 0.8%, with defects caused by bad flatness drastically decreased. |
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