JPS6049807A - Device for controlling temperature of rolling material - Google Patents

Abstract

PURPOSE:To bring the temperature of a rolling material closer to a target one and to improve the quality of a product by feedforward controlling a cooling device of rolling material basing on the information of the temperature measured at the inlet side of a mill. CONSTITUTION:The temperature of a rolling material 5 is measured by a thermometer 6 provided to the inlet of a mill stand 1, and the information of temperature change is inputted to a feedforward control device 7. The device 7 outputs a command for changing the flow rate of cooling water by using the deviation between the measured temperature and a target one inputted previously as a controlled variable for bringing the deviation closer to the target temperature to a cooling device 3. By this mechanism, the device 3 can bed controlled till the limit of its capacity, and the highly accurate control temperature can be performed in conformity with the running of the material 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rolled material temperature control device that controls the temperature at the finish exit side of a rolled material in a steel hot rolling plant to approach a target temperature.

(Prior art) Conventionally, the one shown in Fig. 1 has been known as a kerosene seed device.In the figure, (1) is a finish rolling mill stand that is arranged in plurality in the rolling path, and (2) is a finishing mill stand. (8) is a cooling device installed at the exit side of the finishing rolling mill stand (1), such as a spray cooling device, and (4) is a cooling device installed on the exit side of the finishing rolling mill stand (1). The deviation amount proportional integrator (4), which is a quantity proportional integrator, calculates the deviation between the set target temperature and the measured temperature of the rolled material (5) measured by the finishing outlet side thermometer (2). The amount is outputted to the cooling device 1i (Ill) as a control amount to control the amount of cooling water from this cooling device (8).

In the apparatus having the above configuration, the temperature of the rolled material (5) to be rolled in the rolling mill (1) is measured using the finishing outlet side thermometer (2), and the deviation amount between this temperature and the target temperature is calculated by the deviation proportional integral. The integrator (4) issues a command to change the amount of cooling water as a controlled variable to the cooling device (8). Based on this command, the cooling device (81) increases or decreases the amount of pressure of the cooling water. , the amount of cooling water is changed to control the degree of hardness A on the rolling side (6) so that it approaches the target temperature.

However, in such equipment, the rolled material (δ
) and the cooling position directly below the spray nozzle of the cooling device (8) for controlling the temperature on the rolling side (5) are different from each other.
) Due to the feedback control that controls the cooling device (8) based on the measured temperature at change(
Although a slight effect was seen on thermal rundown (temperature change from the rolling tip temperature to the wet ash at the tail end of the rolled material), there was almost no effect on temperature changes within the rolled material (temperature skid). There are very few flaws that can't be solved.

[Summary of the invention]

The present invention was made in order to eliminate the drawbacks of the conventional products as described above, and it measures the temperature of the rolled material at the inlet side of the rolling mill and shifts the measured information in accordance with the running of the rolled material. It is an object of the present invention to provide a temperature control device for a vine-rolled material that performs highly accurate temperature control through feedforward control.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on FIG. 2. (5) is a finishing inlet side thermometer attached to the inlet side of the first rolling mill (1), and (7) is a finishing inlet side thermometer (6
) An output control device for feedforward control that controls the cooling device (3) so that the temperature of the rolled material (1) approaches the target temperature by using the deviation between the temperature information obtained in (1) and the target temperature as a control output amount. (hereinafter referred to as a feedforward device). In other words, in the embodiment shown in FIG.
) is provided on the inlet side of the rolling mill stand (1), whereas the cooling device i (8) is provided forward of the temperature side (6) in the rolling progress direction. A configuration in which the temperature measurement position and the cooling position of the material (5) are different, and the cooling device (8) is feedforward controlled by the feedforward device (7) to bring the temperature of the rolled material (5) closer to the target temperature. It becomes.

In such equipment, the temperature of the rolled material (5) is actually measured with the finishing inlet side thermometer 6), and this temperature change information is input to the feedforward device (TE), and the temperature change is inputted to the feedforward device (TE). The temperature change information f is shifted to just below the spray of the cooling device W (8) with the movement of the rolled material (5), and further synchronized with the running of the rolled material (5), from the feed forward device (1) in advance. As a control amount that brings the deviation from the input target temperature closer to the target temperature,
By giving a command to change the amount of cooling water to the spray cooling device (8), it is possible to control temperature changes at a relatively fast frequency to the limit of the cooling capacity of the cooling device (8). It goes without saying that the effects can be further enhanced by combining the configuration of the above embodiment with conventional monitor-like control.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to control the control amount of the pool for cooling the rolled material in synchronization with the actual temperature change of the rolled material, and also to reduce the response delay of the control system, that is, by providing a reference, the actual spray can be controlled. Taking into account the time delay before injection, it is also possible to output a control amount to cool the area slightly earlier than directly below the cooling device, which has the effect of providing a highly efficient device.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional rolled material temperature control device, Fig. 2 is a block diagram of a rolled material temperature control device showing an embodiment of the present invention, and Fig. 6 is a characteristic showing the temperature change of the rolled material. It is a diagram. (1)...Rolling mill (2), (6)...Thermometer (8)...
- Cooling device (7): Feedforward control device In the drawings, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa

Claims (1)

[Claims] a temperature measuring device that measures the temperature state of the rolled material at the entrance side of the rolling stand; a cooling device that is provided in front of the temperature measuring device in the rolling direction to cool the rolled material; and a cooling device that cools the rolled material based on the temperature measured by the temperature measuring device. A rolled material temperature control device comprising: a feedforward control device that controls the cooling device to bring the temperature of the rolled material close to a target temperature.