Control device and control method of hot rolling mill
A technology of a control device and a control method, which is applied in the direction of temperature control, etc., can solve the problems such as the inability to correspond to the conveying speed of the cooling bed and the change of the cooling start time.
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Embodiment 1
[0041] Refer to the following figure 1 An example of the present invention will be described. The hot rolling mill control device 100 of this embodiment receives various signals from the controlled object 150 and outputs a control signal to the controlled object 150 .
[0042] The control object 150 of this embodiment is a hot rolling mill, and a steel plate f called a slab f0 extracted from a heating furnace 151 at a temperature of about 1200° C. and a thickness of about 220 mm is rolled by a rough rolling mill 152 into a slab of about 25 to 40 mm. The steel plate f called the rough profile f1 is further rolled into a thin steel plate f2 of about 1 to 25 mm by the finish rolling mill 153, cooled to the target temperature by the coil cooling device 154 and coiled by the coiler 155 to form Steel coils for rolled products.
[0043] The finishing mill 153 includes six rolling stands 156 , and each rolling stand 156 has a work roll 157 for controlling the thickness of the rough ...
Embodiment 2
[0113] refer to Figure 14 Other embodiments of the present invention will be described. With respect to said embodiment 1, this embodiment is characterized in that the standard material factor value table 112a is used instead of the standard speed-standard finishing temperature table 112 of the embodiment 1. Other structures are the same as in Embodiment 1. exist Figure 15 An example of the structure of the standard material factor value table 112a is shown. In this example, a value obtained by adding a constant value to the common logarithm of the Z parameter for each steel type is stored as a standard material factor value. In addition, the factor shown in the figure is an example, as long as the Z parameter range effective in hot rolling is 10 8 ~10 16 Among them, the function of Z corresponding to 1:1 can be used as an appropriate standard material factor. Compared with Embodiment 1, this embodiment has the advantage that specification of standard conditions is sim...
Embodiment 3
[0115] refer to Figure 16 Another embodiment of the present invention will be described. Figure 16 An example in which the controlled object 150 is provided with the heating device 187 for heating the steel plate f ( f1 ) between the heat retention device 181 and the finish rolling mill entrance thermometer 164 is shown.
[0116] exist Figure 16 In the control object 150, the heating device 187 is configured so that the target heating temperature changes according to the command value of the hot rolling mill control device 100. , the command value of the target heating temperature mode (hereinafter referred to as heating mode) of the heating device 187 is also calculated in addition to the command values of the soaking time mode, the injection pressure mode, and the opening and closing mode. Moreover, the dynamic control unit 120 includes a heating device control unit 125, and the heating device control unit 125 uses the detected temperatures from the roughing mill exit...
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