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- Outline of Computer System for Cold Rolling Mills
- Hitachi has extensive experience in computer control for cold rolling mills. Hitachi can supply a mathematical model control system and information control system based the experience.
- Mathematical Model Setup Function for Cold Rolling Mills
- The setup function calculates an optimum reduction schedule. Motor power balance is the most important item to get maximum productivity and a good reduction schedule. The reduction schedule is automatically adjusted by self learning function to get better power balance. Adjustment of the reduction schedule is not necessary. This means a "maintenance free reduction schedule system".
- Dynamic Setup Function
- When the head end of a coil is passing through the first stand, actual data, such as entry thickness, rolling force and delivery thickness of the first stand, are gathered. The dynamic setup calculates setup values of succeeding stands again, according to the results of the self-learning function. This function shortens the off-gauge length. The dynamic setup calculates AGC (Automatic Gauge Control) parameters periodically. This increases AGC accuracy.
- Mill Pacing Control
- Mill pacing controls forecast time schedules of the entry facility, rolling mill, and delivery facility. This optimizes entry facility (Pickling) speed and rolling speed and minimizes the number of times of acceleration and deceleration. This realizes maximum productivity and stable rolling.
- Mathematical Model Tuning Tool and Packages
- Cold rolling mill systems have many mathematical models and model tuning is very important for startup of a hot rolling plant. Hitachi has many model tuning tools using statistic analysis methods.
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