Abstract: A rolling mill shape control apparatus for a flat material comprises a thermal crown calculator which calculates a thermal crown magnitude in a widthwise direction of rolls as based on rolling history information after a change in vertical spacing of the rolls, a roll wear calculator which calculates a wear magnitude of the rolls as based on rolling history information after the rearrangement of the rolls, an optimum rolling temperature distribution calculator which calculates an optimum rolling temperature distribution in a widthwise direction of the flat material on the basis of the calculated results of both the thermal crown calculator and the roll wear calculator and a reference bending force corresponding to maximum bending correction, a thermometer which detects a widthwise temperature distribution of the flat material, a heating/cooling device which can separately heat/cool a plurality of parts of the flat material divided in the widthwise direction thereof, and a heating/cooling controller which comp

Abstract: In heating control method of a heat furnace, three non-linear models, model to calculate furnace temperature based on the fuel flow rate by unsteady heat balance system, model to estimate furnace wall temperature distribution based on the furnace temperature and model to estimate material temperature based on the furnace temperature, are used, linearization is performed by perturbation simulation to vary the flow rate stepwise and the optimization to minimize the fuel flow rate is performed and the optimum furnace temperature per each material is determined, and the mixed combustion ratio of plural fuels obtained by dividing total calorific value of each fuel by total calorific value of all fuels and the furnace temperature setting value are calculated using the optimum furnace temperature per material and then set.

Abstract: A shape control apparatus for producing rolled products from flat material comprising a plurality of rolls for shaping the material. Temperatures at a plurality of points, including a widthwise center of the material lying on an incoming side of the rolls, are detected to determine a widthwise temperature distribution. A rolling history of the number of products rolled and time interval between rolling of products, and the rolling weight are taken into consideration to determine a thermal crown magnitude and a roll wear magnitude for the rolls. An optimum bending force for controlling the rolls is determined based on calculated results of the thermal crown magnitude, the roll wear magnitude, and the load distribution of the rolls.

Abstract: A method of controlling the rolling efficiency in a continuous hot rolling process including the steps of inputting a total weight of and the time intervals of slabs already extracted from a heating furnace in a period from the present time up to any previous time, a total weight and a forecast furnace residence time of slabs charged in the heating furnace and a total weight of any number of slabs to be charged, and calculating the desired rolling efficiency of the slabs to be charged to thereby control the overall average rolling efficiency to a predetermined value. With such a method, the total weight of the slabs to be rolled in a unit time is maintained to a predetermined value.

Abstract: An apparatus for controlling the temperature of a material being rolled into a rod in a rod rolling line having a continuous rolling mill with a first thermometer located at an inlet thereof, a plurality of water cooling units located at an outlet thereof and having an adjustable cooling water flow rate, and a laying head for winding the rod, the laying head having a second thermometer located at an outlet thereof. The apparatus comprises an arithmetic device for computing the rate of flow of cooling water based on a rolling schedule for the continuous rolling mill, an expected temperature at an inlet of the continuous rolling mill, and a target temperature at the laying head, and a control device responsive to a result of computation by the arithmetic device for controlling the rate of flow of cooling water.

Abstract: In controlling furnace temperature, a desired temperature profile of a slab in a direction along its movement through a furnace is calculated by using an expression for total fuel flow as a function of slab temperature and minimizing the total fuel flow. The present slab temperature is calculated by using the distribution of present gas temperatures in the furnace. The heating of the furnace is adjusted based on the temperature difference between the present slab temperature and a desired temperature.

Abstract: A control method comprises predetermining a or presuming a fuel flow rate for each of three control zones of a continuous slab reheating furnace, predicting each slab temperature after a plurality of time intervals from the presumed fuel flow rate, and controlling the fuel flow rate for each zone so as to minimize the sum of the differences between the predicted temperatures and corresponding objective temperature rise curves for all the slabs. Alternatively, the method may comprise sensing flow rates of the fuel and air for each zone at time intervals .DELTA.t, calculating the temperature profile within the furnace and then the temperature of each slab at the present time point from the sensed flow rates, repeating the calculations with the calculated slab temperature and any presumed fuel flow rate for each zone to predict the temperature profile within the furnace and each slab temperature after .DELTA.

Abstract: For each of three control zones in a furnace, a computer calculates, at time intervals .DELTA.t, the heat input to slabs from the actual flow rates of the fuel and air and other stored data through the use of the equation of the thermal equilibrium and then determining the heat input to each slab by apportioning the calculated heat input among the slabs according to its heat content before the .DELTA.t. Subsequently, the computer estimates the fuel flow rate after the time interval .DELTA.t from a difference between the calculated heat input and an objective heat input and then determining the fuel flow rate through the use of the equation of the thermal equilibrium. For each control zone, a fuel regulator controls the fuel flow rate in response to the estimated flow rate while an air regulator controls an air flow rate in response to an optimum air ratio as determined by the estimated flow rate.