| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.16 ( June 1987 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Development of Computer Control Techniques
for Tandem Mill with Grooved Rolls Kazushi Baba, Takashi Fujimoto, Kazuo Arai, Katsushi Fujioka, Junjiro Yamasaki, Teruyuki Nakanishi |
| Synopsis: Kawasaki Steel has recently developed computer control techniques for a 4-stand tandem mill with grooved rolls, which consists of set-up and dynamic control functions, as the billet mill in Mizushima Works. The essential part of the set-up control, with the main aim of controlling dimensions between bars, comprises sophisticated mathematical models to precisely predict such rolling parameters as material temperature, rolling force, and width spread. They are based on theoretical constructs and actual data from grooved rolling. For dynamic control to achieve uniform sectional dimensions along the length of the material, new sectional profile control techniques, utilizing roll gap control, has been developed, replacing the traditional tension control system. As hardware improvement, A.C. variable speed control systems were adopted in mill motors, among which all the main motors are digitally controlled. As the result, the dimensional accuracy of the product has been significantly improved in the mill. |
| TextiPDF: 10p./442kbj |