JPH0230767B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a rolling control device that is equipped with a device that measures the thickness or width of a steel plate on the downstream side of a rolling mill, and uses this measurement signal to improve the dimensional accuracy of the steel plate. It is related to.

Conventionally, there has been a device of this type as shown in FIG. In the figure, 1 indicates a steel plate, and 2 indicates a rolling mill. The steel plate 1 is rolled by the rolling mill 2 while moving from the left to the right in FIG. The plate thickness measuring device 4 measures the thickness of the steel plate 1 immediately below it, compares it with a preset reference plate thickness signal, and outputs the deviation as a plate thickness deviation signal 5. Further, when the plate thickness deviation signal 5 is positive, that is, when the thickness of the steel plate 1 directly below the plate thickness measuring device 4 is thicker than the reference plate thickness, the plate thickness control device 6 performs a rolling drive to reduce the roll gap. A signal 7 is supplied to the reduction drive device 3. Conversely, when the plate thickness deviation signal 5 is negative, the steel plate 1
Since the thickness of the plate is too thin, a rolling drive signal 7 is sent to the rolling drive device 3 to increase the roll gap.

Since the conventional rolling control device is configured as described above, for example, even if the thickness of the steel plate 1 directly below the rolling mill 2 matches the reference plate thickness, the thickness of the steel plate 1 directly below the plate thickness measuring device 4 may change. If the plate thickness differs from the reference plate thickness, the plate thickness measuring device 4 outputs a positive or negative plate thickness deviation signal 5, and the rolling drive device 3 changes the roll gap so that the plate thickness deviates from the reference plate thickness. Put it away. In order to alleviate such inconveniences, it is necessary to reduce the control gain in the plate thickness control device 6, but in this case, there is a drawback that the control accuracy of the plate thickness does not improve.

This invention was made in order to eliminate the drawbacks of the conventional devices as described above, and it uses a measurement signal output by a device for measuring the thickness or width of a steel plate that has passed through a rolling mill, and the measurement signal of the steel plate at this measurement position. Rolling control that can improve the control accuracy of steel plate dimensions by extracting a control signal based on the correction amount signal received when a part is rolled in a rolling mill and controlling the roll gap using this control signal. The purpose is to provide equipment.

An embodiment of the present invention will be described below with reference to the drawings. In Figure 2, 1 is a steel plate, 2 is a rolling mill, 3
4 is a rolling drive device, and 4 is a plate thickness measuring device, and these elements are substantially the same as those shown in FIG. Reference numeral 8 denotes a steel plate speed measuring device, 10 a plate thickness correction amount storage device, and 12 a plate thickness control device which is a control signal generating device.

Next, the operation will be explained. Plate thickness control device 1
2 performs a rolling drive using a rolling drive signal 7 created based on the plate thickness deviation signal 5 sent from the plate thickness measuring device 4 and the plate thickness correction amount signal 11 sent from the plate thickness correction amount storage device 10. At the same time, the plate thickness correction amount signal 13 is supplied to the plate thickness correction amount storage device 10.

The plate thickness correction amount storage device 10 has n storage elements (n is an integer of 2 or more), and first stores the plate thickness correction amount signal 13 supplied from the plate thickness control device 12 in the first storage element. Then, using the steel plate speed signal 9 at predetermined intervals, as the steel plate 1 moves, the memory contents of the memory elements are sequentially transferred to the subsequent memory elements, and the contents are transferred to the first memory element. The stored plate thickness correction amount signal 13 is transferred to the n-th storage element at the time when the part being rolled by the rolling mill 2 at that time reaches directly below the plate thickness measuring device 4 as the steel plate 1 moves. Then, the stored contents are used as plate thickness correction amount signal 1.
It operates to output as 1. In other words, the plate thickness correction amount storage device 10 stores the plate thickness correction amount that the steel plate 1 has undergone directly below the rolling mill 2, and internally transfers the stored contents as the steel plate 1 moves, so that the corresponding part of the steel plate 1 At the timing when the plate reaches directly below the thickness measuring device 4, it is output as the plate thickness correction amount signal 11.

Next, when the tip of the steel plate 1 reaches a position directly below the plate thickness measuring device 4, a plate thickness deviation signal 5 is outputted from the plate thickness measuring device 4 and sent to the plate thickness control device 12.

For example, as shown in FIG. 3, the plate thickness control device 12 includes an adder 14, an integrator 15, and a multiplier 16.
If the plate thickness deviation signal 5 is Δh1, the plate thickness correction amount signal 11 is Δh2, the plate thickness correction amount signal 13 is Δh3, and the rolling drive signal 7 is ΔS, then the following formulas (1) to (3) are used. Perform the indicated operation.

Δhe=Δh1+Δh2−Δh3...(1) Δh3=Σ(Δhe)...(2) ΔS=G・Δh3...(3) Here, Δhe is the output signal of the adder 14, and G
is a conversion coefficient from a separately set plate thickness correction amount to a rolling drive amount.

Next, equations (1) to (3) will be explained. From the time the tip of the steel plate 1 begins to be rolled by the rolling mill 2 until the tip reaches directly below the plate thickness measuring device 4, Δh1
is not output, and in equations (1) to (3), Δh1=Δh2=Δh3=Δhe=ΔS=0 (4).

Next, when the tip of the steel plate 1 comes directly under the plate thickness measuring device 4, Δh1 is output. For example, if the measured plate thickness is thicker than the reference plate thickness, Δh1=Δh (>0). At this time, since the portion of the steel plate 1 directly below the plate thickness measuring device 4 had not undergone plate thickness correction at the rolling mill 2 position, Δh2=0. As mentioned above, since Δh3=0 at the first stage, from equation (1), Δhe=Δh (5). Therefore, from equations (2) and (3), Δh3=Δh...(6) ΔS=G・Δh3=G・Δh……(7). The rolling drive signal 7 is output according to this equation (7), and the rolling drive device 3 that receives this signal controls the roll gap of the rolling mill 2, so that the thickness of the steel plate 1 directly under the rolling mill 2 is increased by Δh. The thickness is adjusted to the standard plate thickness.

Here, if we consider after a short period of time has passed from the above-mentioned state, the part of the steel material directly under the plate thickness measuring device 4 has already undergone plate thickness correction directly under the rolling mill 2, so the new plate thickness deviation signal 5 The value of is Δh1=0...(10). Also, due to the operation of the plate thickness correction amount storage device 10, the plate thickness correction amount signal 11 becomes Δh2=Δh...(11), and from equation (6), Δh3=Δh, so (1)
In the formula, Δhe = Δh1 + Δh2 - Δh3 = 0 + Δh - Δh = 0 ...(12), and Δh3 maintains Δh, so ΔS does not change from equation (3), so the roll gap of rolling mill 2 is maintained. Therefore, the thickness of the steel plate 1 immediately below the rolling mill 2 is maintained at the reference thickness.

The above explanation is for an ideal state, but if there is an error in the conversion coefficient G from the thickness correction amount to the rolling drive amount in equation (3), the thickness deviation can be calculated in equation (10). Since signal 5 does not have Δh1=0, Δhe≠0 and Δhe occur in equation (12), and rolling drive signal 7 is corrected by equations (2) and (3), and the roll gap of rolling mill 2 is Therefore, the plate thickness of the steel material 1 directly under the rolling mill 2 is corrected to the reference plate thickness.

Furthermore, in the above configuration, Δhe in equation (1)
The conversion coefficient G in equation (3) can also be controlled by learning using the signal. For example, plate thickness correction signal 1
1=Δh2, the Δhe signal in equation (1) becomes Δhe=
If the amount of Δhe occurs, this means that even though the plate thickness has been corrected by the amount of Δh2 for the part of the steel material 1 directly under the plate thickness measuring device 4, the plate thickness needs to be further corrected by the amount of Δhe. means. Therefore, the newly learned transformation coefficient G′ is the original transformation coefficient G
For, G′/G=Δh2/Δh2−Δhe……(15) or G′=(1+Δhe/Δh2−Δhe)G……(16) However, when |Δh2−Δhe| is less than a minute amount, Let Δhe/Δh2−Δhe=0.

It is possible to learn the conversion coefficient G as follows.

In the above embodiment, the steel plate speed signal 9 is obtained from the steel plate speed measuring device 8, but it may also be obtained from the rolling speed of the rolling mill 2 through arithmetic processing.

Although FIG. 2 shows the case where only one rolling mill 2 is used, the present invention can be similarly applied to a case where two or more rolling mills are used.

FIG. 4 shows the configuration when three rolling mills 2a, 2b, 2c are used, and each rolling mill has a rolling drive device 3a, 3b, 3c, a steel plate speed measuring device 8a, 8b, 8c, Plate thickness correction amount storage device 10
A, 10b, 10c, and a plate thickness or plate width measuring device 4 are provided downstream of the final rolling mill.
Further, between adjacent rolling mills, calculation devices 17a and 17 that perform predetermined calculations based on sheet thickness correction amount signals 13b and 13c output from the sheet thickness control device 12 are provided.
b is provided. As shown in FIG. 5, the arithmetic device 17a has a multiplier and an adder, and receives the signal 11a output from the plate thickness correction amount storage device 10a,
It operates to output a signal 18a obtained by adding the plate thickness correction amount signal 13b to the multiplication signal by a separately set coefficient Qa to the plate thickness correction amount storage device 10b. Here, the coefficient Qa is a conversion coefficient when the inlet side plate thickness is converted into the outlet side plate thickness in the rolling mill 2b. The other arithmetic unit 17b also performs similar operations based on signals 11b and 13c.

Next, to explain the operation, the plate thickness control device 12 controls the rolling drive devices 3a, 3b, 3c that change the roll gap of each rolling mill 2a, 2b, 2c.
, the reduction drive signals 7a, 7b, 7c are outputted, and the plate thickness correction amount storage devices 10a, 10b, 1
For 0c, plate thickness correction amount signals 13a, 13b, 1
Outputs 3c. Plate thickness correction amount storage device 10a, 1
0b, 10c are steel plate speed measuring devices 8a, 8b,
Steel plate speed signals 9a, 9b, 9c sent from 8c
internally transfers the memory contents of each memory element using
Plate thickness correction amount signal 11a, 1 at a predetermined timing
1b and 11c are output. For example, regarding the plate thickness correction amount storage device 10a, the plate thickness correction signal 13
When the part of the steel plate 1 corresponding to a reaches directly below the rolling mill 2b, the plate thickness correction amount signal 1 for that part
Output 1a.

On the other hand, the arithmetic unit 17a calculates the effect on the plate thickness correction amount by rolling the part of the steel plate 1 on the entry side of the rolling mill 2b by the rolling mill 2b.
By converting with Qa and adding the thickness correction amount newly applied to the steel plate 1 with respect to the rolling mill 2b to obtain the output signal 18a, this signal 18a indicates that the part of the steel plate 1 directly under the rolling mill 2b is being rolled. Machine 2
It shows the sum of the plate thickness correction amounts received by a and 2b. Since the plate thickness correction amount storage devices 10b, 10c and the calculation unit 17b also perform the same operations as described above, the plate thickness correction signal 11c supplied to the plate thickness control device 12 is transmitted to the rolling mills 2a, 2b, and 2c. This shows the total amount of plate thickness correction received.

Similarly to the above, the plate thickness control device 12 outputs the signal 5 as Δh1, the signal 11c as Δh2, the signals 13a, 13b,
13c respectively Δh3a, Δh3b, Δh3c, signal 7a,
When 7b and 7c are respectively ΔSa, ΔSb, and ΔSc,
The calculations shown in equations (17) to (23) below are performed.

Δhe=Δh1+Δh2 −(Δh3c+Qb・Δh3b+Qb・Qa・Δh3a)
…(17) Δh3c=Σ(Kc・Δhe)……(18) Δh3b=Σ(Kb・Δhe)……(19) Δh3a=Σ(Ka・Δhe)……(20) ΔSc=Gc・Δh3c… ...(21) ΔSb=Gb・Δh3b ...(22) ΔSa=Ga・Δh3a ...(23) In the above equation (17), Qa is the arithmetic unit 17
It is the same as the coefficient Qa set in a, and Qb is a similar coefficient set in the arithmetic unit 17b.
Also, Gc, Gb, and Ga are the same as the coefficient G in equation (3), and Kc, Kb, and Ka are rolling mills 2c, 2
Indicates the distribution coefficient of the plate thickness correction amount to b and 2a, and is set to a value that satisfies the following equation (24).

Kc+Qb・Kb+Qb・Qa・Ka=1
...(24) The operation of the plate thickness control device 12 is basically the same as in the case of FIG. 2.

Further, in each of the above embodiments, the case where the thickness of the steel plate is controlled has been described, but the present invention can be similarly applied to the case where the plate width is controlled.

As described above, according to the present invention, the deviation signal output by the plate thickness or plate width measuring device and the plate thickness received when the steel plate portion directly under the plate thickness or plate width measuring device passes through the rolling mill. The control response speed is significantly improved compared to the conventional method, and the rolling drive signal for controlling the roll gap of the rolling mill is determined using High control accuracy can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a conventional rolling control device, FIG. 2 is a block diagram showing the configuration of a rolling control device according to an embodiment of the present invention, and FIG. 3 is a block diagram of the plate thickness control device. FIG. 4 is a block diagram of a rolling control device according to another embodiment, and FIG. 5 is a block diagram of its arithmetic circuit. 1... Steel plate, 2, 2a, 2b, 2c... Rolling machine,
3, 3a, 3b, 3c... Rolling down drive device, 4... Plate thickness measuring device, 5... Plate thickness deviation signal, 7, 7a, 7b,
7c... Rolling down drive signal, 8, 8a, 8b, 8c... Steel plate speed measuring device, 9, 9a, 9b, 9c... Steel plate speed signal, 10, 10a, 10b, 10c... Plate thickness correction amount storage device, 11, 11a, 11b, 11c...
Plate thickness correction amount signal, 12... Plate thickness control device, 13,
13a, 13b, 13c...Plate thickness correction signals. In addition,
The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A plate thickness or plate width measuring device that measures the plate thickness or plate width of a steel plate coming out of a rolling mill and generates a deviation signal from a reference value, and a plate directly below the plate thickness or plate width measuring device. a correction amount storage device that generates a signal indicating the amount of plate thickness or plate width correction applied to each part of the steel plate when it is rolled in the rolling mill at the timing when the steel plate reaches , and the deviation signal and the correction amount. In a rolling control device comprising a control signal generating device that generates a control signal for controlling a roll gap of the rolling mill based on a correction amount signal, the control signal generating device generates a control signal for controlling a roll gap of the rolling mill based on the correction amount signal and the deviation signal. an adder that subtracts the correction amount signal from the sum of the sum of A rolling control device comprising a multiplier. 2. A plurality of rolling mills are installed to sequentially roll the above-mentioned steel plate, and the above-mentioned plate thickness or plate width measuring device is installed on the downstream side of the final rolling mill, and there is no upstream side between the adjacent rolling mills. The plate thickness or plate width correction amount signal from the correction amount storage device of the rolling mill and the conversion coefficient for converting the plate thickness or plate width on the input side into the plate thickness or plate width on the output side in the downstream rolling mill. Claims characterized in that an arithmetic device is provided for outputting a total signal obtained by adding a plate thickness or plate width correction amount signal of a downstream rolling mill to a correction amount storage device of a downstream rolling mill. The rolling control device according to item 1. 3. The control signal generating device according to claim 1 or 2, wherein the control signal generating device has means for learning and changing a conversion coefficient from the plate thickness or plate width correction amount signal to the control signal. Rolling control device.