JP2667340B2 - Winding temperature control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding temperature control device for controlling a temperature at the time of winding a material to be rolled in a hot rolling line or the like.

[0002]

2. Description of the Related Art The winding temperature of a hot rolling line is controlled by measuring a finishing temperature, a sheet thickness, and a rolling speed of a material to be rolled, and formulating these factors theoretically or experimentally to calculate a cooling water amount. Calculate, control the cooling water according to the calculated value, measure the winding temperature, and correct the cooling water amount by feedback control according to the measured value. This type of temperature control has already been automated, and at present there is a strong demand for advanced control techniques to obtain high quality products. FIG. 3 is a block diagram showing a conventional winding temperature control device disclosed in, for example, Japanese Patent Publication No. 52-1385, wherein 1 is a rolled material, 2 is a final rolling mill, and 3 is a rolled material 1. Machine,
4 is a speed detector for the material 1 to be rolled, 5 is a speed monitoring device for monitoring the speed detected by the speed detector 4, 6 is a thickness detector for the material 1 to be rolled, and 7 is the finishing side of the material 1 to be rolled. A temperature detector for detecting the temperature, 8 a computing unit for correcting the cooling capacity of the material to be rolled 1 at a constant speed based on the detected speed, plate thickness, and temperature;
Numeral 9 designates an arithmetic unit for correcting the cooling capacity of the rolled material 1 during acceleration, and numeral 10 designates the rolled material 1 based on the detected speed, temperature, sheet thickness, target winding temperature and output signals of the arithmetic units 8 and 9. Is an operation control device for transmitting a cooling water amount control signal in accordance with an input signal from the calculation device 10, and 12 is a cooling device which is operated by the operation control device 11 to spray cooling water.

Next, the operation will be described. In this winding control device, the correction coefficient K in the cooling model of the cooling capacity Q according to the following equation at the time of constant speed and acceleration of the material 1 to be rolled is separated into K1 for acceleration and K2 for constant speed. Corrections are made on condition. Q = K1 · h · V · (a · FT−CT + b) + K2 (1) where K1, K2: correction coefficient h: plate thickness of rolled material V: speed of rolled material FT: finish Side temperature CT: Target winding temperature a, b: Constant

[0004] The material to be rolled 1 is rolled by the rolls of the final rolling mill 2, and while being wound on a coil by the winder 3, a constant speed is monitored by a speed monitoring device 5 based on a speed signal from a speed detector 4. Or the acceleration is determined, and the corresponding correction coefficient is subjected to learning operation using the arithmetic unit 8 during the constant speed and the arithmetic unit 9 during the acceleration, and the corrected coefficient is input to the calculation device 10,
The required cooling capacity is calculated by the calculation device 10, a water injection pattern is selected and given to the operation control device 11. In response to this, the operation control device 11 controls the cooling device 12 to spray a predetermined amount of injected water to the material 1 to be rolled.

[0005]

Since the conventional winding temperature control device is constructed as described above, since the speed detector 4 is used to detect the speed of the material 1 to be rolled, acceleration / deceleration is performed. There is a delay in water injection control when a spot occurs.
In particular, in order to facilitate passing when the tail end of the material to be rolled 1 passes through the rolling mill, deceleration is usually performed. However, the detection of this deceleration is delayed, and the material 1 already existing in the cooling zone is delayed due to the delay. Since the water injection amount control is performed on the premise that the water is accelerated, the water is cooled below the winding temperature target, and there is a problem that the quality of the tail end tens of meters deteriorates.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a winding temperature control device capable of controlling the temperature of the tail end of a material to be rolled to a target temperature.

[0007]

A winding temperature control apparatus according to the present invention includes first and second pulse counters for detecting rotation of each roller of a first rolling mill and a last rolling mill,
Based on the pulse output of each pulse counter, the timing at which the tail end comes off is predicted and calculated to control the water injection amount.

[0008]

According to the winding temperature control device of the present invention, the first pulse counter performs distance tracking of the pressure extension from the leading end ON, and the tail end position can be controlled by either the first or the second pulse counter. Predictive calculation detects when the tail end comes off in the more likely one, and at that timing,
The amount of water injected by deceleration is recalculated, and the amount of water injected by deceleration is controlled earlier than before.

[0009]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, parts corresponding to those in FIG. In FIG. 1, 13 is a first stage rolling mill, 14 is a first pulse counter coupled to rollers of the first stage rolling mill 13 to detect the length and speed of the material 1 to be rolled, and 15 is a roller of the last stage rolling mill 2. The combined second pulse counter 16 detects a length corresponding to the length of the cooling zone to be cooled by the cooling device 12 based on the pulse output of the second pulse counter 15 and generates a signal at regular intervals. A fixed length generator 17 for detecting the length of the material 1 to be rolled by the pulse output; and 18 detecting the speed of the material 1 to be rolled by the pulse output of the second pulse counter 15 Speed detector.

Reference numeral 19 denotes a first and second pulse counter 14,
A prediction computing unit for predicting the timing at which the tail end of the material to be rolled 1 passes through the final stage rolling mill 2 based on the pulse output of No. 15
0 is a speed pattern estimator that calculates the predicted passage timing of the cooling device 12 based on the detected length, speed, predicted timing, and the like of the material 1 to be rolled, 21 is the detected thickness and temperature of the material 1 to be rolled This is a control device that controls the valves of the cooling water nozzle group of the cooling device 12 based on the fixed length, the passage timing, and the like. The calculation control device is constituted by the above 16 to 21.

Next, the operation will be described. A cooling device 12 is installed in a section where the material 1 to be rolled out of the final rolling mill 2 travels, is divided into a cooling zone of a fixed length, and is provided for the material 1 to be rolled on the traveling section. Tracking is performed using this fixed length as a unit. The pulse output of the second pulse counter 15 linked to the rotation of the roll of the last rolling mill 2 is applied to a speed detector 18, a rolled material length measuring device 17, and a fixed length generator 16. The fixed length generator 16 generates a signal each time the material 1 to be rolled advances by the length of the cooling zone. Outputs of the speed detector 18 and the rolled material length measuring device 17 are applied to a speed pattern estimator 20. Each time the signal of the fixed length generator 16 is generated, the control device 21 is started. The control device 21 collects the output of the speed pattern estimator 20 and the predicted passage timing of the material 1 to be rolled through the cooling device 12 and the actual measurement values from the thickness detector 6 and the temperature detector 7,
Determine the optimal water injection amount when the material to be rolled 1 rolled by the final rolling mill 2 passes through a portion corresponding to the length of the cooling zone,
The valve provided in the cooling nozzle group of the cooling device 12 is opened and closed.

On the other hand, the last rolling mill 2 and the first rolling mill 13
First and second pulse counters 1 linked to the roll of
From the number of pulses of 4,15, the former increases the pressure from the tip,
The latter performs the tracking of the tail moving distance after passing through the position where the tail end is designated, the prediction calculation unit 19 provides the velocity pattern estimator 20 asking the timing of tail is decelerated. Based on the speed pattern estimated by the speed pattern estimator 20, the control device 21 recalculates the cooling pattern of the material 1 to be rolled at the present time when the portion corresponding to the cooling zone length passes through the cooling device 12. Determine the optimal water injection volume. In response, the cooling device 12 opens and closes a valve provided in the cooling nozzle group.

According to the above, as shown in FIG. 2, the speed pattern of the material to be rolled 1 is such that when the material to be rolled 1 passes through the last rolling mill 2, the first acceleration a is reached until it reaches the winder. performed, performs the second acceleration b to reach the maximum speed after reaching, rolled in while constant speed c, but not be decelerated and leaves the rolling mill there is a tail end, time or rolled length this tail escapes Can be predicted in advance, and it is possible to prevent overcooling of the tail end by sequentially tracking the deceleration point of the material 1 to be rolled and performing water injection amount control in consideration of deceleration before the start of deceleration. Becomes

[0014]

As described above, according to the present invention, the first and second pulse counters for detecting the rotation of the rollers of the first rolling mill and the rollers of the last rolling mill are provided, and the pulse output of each pulse counter is provided. It is configured to predict and calculate the timing when the tail end comes off based on the
Rather than controlling the amount of water injected due to deceleration after the rolled material exits the rolling mill, it predicts the deceleration after exiting before the exit, so excessive cooling at the tail end as in the past has been improved Therefore, there are effects such as improvement in quality and yield.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a speed pattern of a material to be rolled.

FIG. 3 is a configuration diagram showing a conventional winding temperature control device.

[Explanation of symbols]

 1 Rolled material 2 Final rolling mill 12 Cooling device 13 First rolling mill 14 First pulse counter 15 Second pulse counter 16 Constant length generator (calculation control device) 17 Rolled material length measuring device (calculation control device) Reference Signs List 18 speed detector (calculation control device) 19 prediction operation device (calculation control device) 20 speed pattern estimator (calculation control device) 21 control device (calculation control device)

Claims (1)

(57) [Claims] 1. A winding temperature control device for controlling the temperature of a material to be rolled by injecting cooling water from a cooling device to the material to be rolled out of a final rolling mill, A first pulse counter interlocked with the rotation of the roll, a second pulse counter interlocked with the rotation of the roll of the last rolling mill, a pulse output of the first and second pulse counters and a pulse output of the material to be rolled. Temperature, elongation of the material to be rolled or movement distance from a designated position is tracked based on the thickness of the material to be rolled, and the deceleration point of the material to be rolled is estimated in advance so that the material to be rolled is actually decelerated before being actually decelerated. And a calculation control device for calculating a water injection amount of the cooling water to the cooling device and controlling the cooling device in accordance with the calculated water injection amount.