JPH037445B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention provides a rolling mill for rolling a rolled material.
The present invention relates to a device for estimating the mill constant, which represents the rigidity of a rolling mill, and the plasticity coefficient, which represents the hardness with which a rolled material deforms.

The operation of a general rolling mill is shown in Figures 1 and 2. In Figure 1, 1 is the upper work roll of the rolling mill, 2 is the lower work roll of the same rolling mill, and 3 is the rolled material. . The thickness of the rolled material 3 before it is rolled in the rolling mill is H, the thickness after rolling is h, the rolling reaction force generated when it is rolled is F, and the top work when the rolling reaction force F is zero. Assuming that the gap between the roll 1 and the lower work roll 2 is S, the relationships between H, h, F and S are shown in FIG. In FIG. 2, a curve A shows that the gap between the upper work roll 1 and the lower work roll 2 increases as the rolling reaction force increases, and the slope M of the curve A is called the Mill constant. Curve B indicates that the thickness of the rolled material 3 decreases as the rolling reaction force increases, and the slope Q of curve B is referred to as the plasticity coefficient. Figure 2 shows that when the roll gap S and the plate thickness H before rolling are given, the rolling reaction force F and the plate thickness h after rolling are curved A.
This shows that it is determined by the intersection (balance point) of and curve B. As mentioned above, the mill constant M and the plasticity coefficient Q affect the plate thickness h of the rolled material 3 after rolling, and in order to improve the accuracy of the plate thickness h after rolling, the mill constant M and the plasticity coefficient Q are It is necessary to accurately grasp the size of the mill constant M and the plasticity coefficient Q in order to perform highly accurate automatic plate thickness control in the well-known automatic plate thickness control (AGC) etc. It is a well-known fact that it is necessary to

Moreover, the mill constant M and the plasticity coefficient Q change depending on various rolling conditions such as the diameter of each roll of the rolling mill, the thickness of the rolled material, the rolling reaction force during rolling, and the plate temperature when the rolled material is rolled. However, it is necessary to accurately grasp the mill constant M and plasticity coefficient Q in the actual rolling state, but conventionally there has been no device that can simultaneously estimate the mill constant M and plasticity coefficient Q in the rolling state.

The present invention has been made in view of the above points, and an object of the present invention is to provide a mill constant and plasticity coefficient estimating device that can simultaneously and accurately estimate the mill constant M and plasticity coefficient Q in a rolling state.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 3, 4a, 4b, 4c are rolling mills that continuously roll the rolled material 3;
3d is a rolled material portion located in front of or upstream of the rolling mill 4a, and 5 is a plate installed at the rear of the rolling mill 4c. A thickness measuring device that outputs the varying thickness of the rolled material 3 from the standard thickness (not shown) after rolling as a signal 6, 7 is the rolling machine 4
A plate thickness measuring device installed in front of a, which outputs the variable thickness of the rolled material 3 from the standard plate thickness (not shown) before rolling as a signal 8, 9a, 9b, 9c, 9
d measures the rolling material movement speed of each of the rolled material portions 3a, 3b, 3c, and 3d, and generates a rolling material movement speed signal 10.
The rolling material movement speed measuring devices 11a, 11b, 11c that output signals a, 10b, 10c, and 10d are rolling reaction force detectors 12a, 12b, and 12c that detect rolling reaction forces generated in the rolling mills 4a, 4b, and 4c, respectively. calculates the variation of the rolling reaction force signals outputted by the rolling reaction force detectors 11a, 11b, and 11c from each reference rolling reaction force signal (not shown) to obtain the rolling reaction force fluctuation signal 13.
What is output as a, 13b, 13c, 14
a, 14b, and 14c are signal storage/transfer devices;
The rolling reaction force fluctuation signals 14a, 14b, 14c are captured and stored at predetermined timings, and the moving speed signals 10a,
10b and 10c are used to transfer the stored signal within the device as the rolled material moves, and when the rolled material portion corresponding to the stored signal arrives at the rear rolling mill, it is output as signals 15a, 15b, and 15c. It is something. That is, the device 14a transmits the rolling reaction force fluctuation signal 13a generated when an arbitrary rolled material portion is rolled by the rolling mill 4a, as the rolled material portion moves between the rolling mill 4a and the rolling mill 4b.
When the corresponding part of the rolled material reaches the rolling mill 4b, it is output as a signal 15a and sent to the device 14.
b performs the same operation between rolling mills 4b and 4c, and device 14c operates between rolling mill 4c and plate thickness measuring device 5.
The same operation is performed between the two. 16a,
16b, 16c are devices for detecting gaps between upper and lower work rolls of rolling mills 4a, 4b, 4c, respectively; 17a, 1;
7b, 17c calculate the variation of the roll gap signal outputted by each device 16a, 16b, 16c from each standard roll gap signal (not shown) and output it as roll gap variation signal 18a, 18b, 18c, 19a, 19b , 19c, similarly to the storage/transfer devices 14a, 14b, 14c, transmit the roll gap fluctuation signals 18a, 18b, 18c in accordance with the movement of the rolled material to determine between the rolling mills 4a and 4b, between 4b and 4c, between 4c and the plate thickness. The signals 20a, 20b, 20 are stored and transferred between the measuring devices 5 and
It outputs c. 21a calculates the outlet side plate thickness variation directly below the rolling mill 4a using the following equation (1) using the rolling reaction force variation signal 13a, the roll gap variation signal 18a, and the estimated mill constant value Ma described later, and generates the outlet side plate thickness variation signal 22a. The outputs 21b and 21c operate similarly to the rolling mills 4b and 4c, respectively.

△h=△F/Ma+△S Here, △h: Variation in plate thickness on exit side △F: Variation in rolling reaction force △S: Variation in roll gap... (1) 23 moves the rolled material in the same way as the storage/transfer device 14a. Using the speed signal 10d, the variable thickness signal 8 of the rolled material 3 before rolling is stored and transferred between the plate thickness measuring device 7 and the rolling mill 4a in accordance with the movement of the rolled material portion 3d,
It outputs the signal 24 after transfer. 25c
estimates the mill constant of the rolling mill 4c using the following method based on the transferred rolling reaction force variation signal 15c, the transferred roll gap variation signal 20c, and the rolled material variation signal 6 after rolling, and outputs the estimated value Mc. Similarly, 25b calculates the mill constant of the rolling mill 4b and the value of the rolled material in the rolling mill 4c using the rolling reaction force variation signals 15b and 13c, the roll gap variation signal 20b, and the exit plate thickness variation signal 22c of the rolling mill 4c. 25a is the one that estimates the plasticity coefficient and outputs each estimated value Mb, Qc, and 25a is the one that outputs the estimated mill constant Ma of the rolling mill 4a and the estimated value Qb of the plasticity coefficient of the rolled material in the rolling mill 4b in the same way as 25b. , 25d are the rolled material variation thickness signal 24 before rolling after transfer, the rolling reaction force variation signal 13a, and the rolling mill 4.
The rolling mill 4 uses the output side plate thickness variation signal 22a of
The estimated value Qa of the plasticity coefficient of the rolled material at point a is output.

The estimation devices 25a, 25b, 25c, 25 are as follows.
An example of an estimation method in d is shown.

Here, △hi: Variation in exit plate thickness of the i-th rolling mill (corresponding to signal 22) △Fi: Rolling reaction force variation in the i-th rolling mill (corresponding to signal 13) △Si: Roll gap variation in the i-th rolling mill (Signal 18
) △Hi: Variation in plate thickness at the entrance of the i-th rolling mill Mi: Mill constant of the i-th rolling mill Qi: Plasticity coefficient of the rolled material at the i-th rolling mill △Fi′: After transferring △Fi (signal 15 ) △Si': After transferring △Si (corresponds to signal 20) △hx: Variable thickness of rolled material after rolling (corresponds to signal 6) △Ho: Variable thickness of rolled material before rolling (corresponds to signal 8) (equivalent) △Ho′: After transferring △Ho (equivalent to signal 24) First, as a basic formula: △Hi=△Fi/Mi+△Si ……(2) △Fi=Qi (△Hi−△hi) …… (3) holds, and since △Hi=△h'(i-1)...(4), the following formula holds true for each rolling mill 4a, 4b, and 4c.

△hx＝△h′c＝△F′c／Mc＋△S′c ……(5) △Fc／Qc＝△Hc−△hc ＝△h′b−△hc ＝△F′b／Mb＋△S ′b−△hc ……(6) Similarly, △Fb／Qb＝△F′a／Ma＋△S′a−△hb ……(7) △Fa／Qa＝△H′o−△ha ……( 8) Equations (5), (6), (7), and (8) above are transformed and written in matrix formation, (−△F′c)・(1/Mc)=(△S′c− △hx) ……(9) (△Fc, −△F′b)・( ^1/QC _1Mb ) = (△S′b−△hc) ……(10) (△Fb, −△F′a)・( ^1/QC _1Ma ) = (△S′a−△hb) ……(11) (△Fa)・(1/Qa)=(△H′o−△ha) ……(12) Here, for example To explain in equation (10), the signal amounts △Fc, △Fb′, △Sb′,
If Δhc is collected at the same time and collected n times, the following formula (13) holds true.

It is well known that the most accurate estimated values of 1/Qc and 1/Mb can be obtained from the following equations (14) to (16) based on the above equation (13).

here 〓T・=△Fc ¹ , △Fc ² ..., △Fcn −△Fb′ ¹ , −△Fb′ ² ..., −△Fb′n ... (16) Here, △Sb′ is the signal 20b, and △hc is signal 22
c and ΔFc correspond to the signal 13c, and ΔFb' corresponds to the signal 15b, respectively, and the calculations of equations (14) to (16) are performed by the device 25b.

Estimates of (1/Mc), (1/Qb, 1/Ma), and (1/Qa) can be obtained in the same manner for the above equations (9), (11), and (12), respectively. Note that (13) above
In Equation (16), we have shown a method to obtain the estimated value (1/Qc, 1/Mb) as an n-order matrix, but by using a matrix sequential calculation method, we can change the order of the matrix to n-th order. Although it is also possible to calculate without increasing the number, this method is omitted here.

By the above method, the estimation devices 25a, 25b,
At 25c and 25d, Ma, Qb, Mb,
Qc, Mc, Qa, the mill constant M of all rolling mills, and the plasticity coefficient Q of the rolled material in all rolling mills can be estimated.

In the above embodiment, the plate thickness measuring device 7 was installed to measure the fluctuating thickness of the rolled material before rolling. It may also be possible to indirectly measure the variation in the thickness of the rolled material (the variation in the thickness of the exit side directly under the rolling mill) in the case where there is no such method.

In addition, if the plate thickness measuring device 7 or equivalent is not installed, the plasticity coefficient Qa of the rolled material in the rolling mill 4a cannot be estimated, but all the mill constants Ma,
Mb, Mc and other plasticity coefficients Qb, Qc can be estimated and have sufficient effects.

In addition, although the rolling material moving speed measurement device 9a to 9d is shown to measure the moving speed of the rolled material in front or behind each rolling mill 4a to 4c, the measuring device 9a to 9d is installed to measure the moving speed of the rolled material in each rolling mill. The work roll is equipped with a device that detects the rotational speed of the work roll, and the detection signal and the advancing rate or backward rate of the rolling material speed for each rolling mill are used to determine the rolling material moving speed on the exit side or entry side of each rolling mill. It may also be measured indirectly.

Moreover, in the devices 21a, 21b, 21c,
According to the above formula (1), the thickness variation (△
h), device 2 is used as the Mill constant M.
Estimated Mill constant values estimated by 5a, 25b, 25c
Although Ma, Mb, and Mc are shown as being used, separately set values may be used instead of estimated values as the Mill constants.

Furthermore, although the above embodiments have been shown using three rolling mills, the same method can be applied even if there is only one rolling mill, two rolling mills, or four or more rolling mills.

Furthermore, in the embodiment described above, the case is related to the thickness (plate thickness) direction of the rolled material, but the case may be related to the width (plate width) direction of the rolled material, and the same effects as in the embodiment described above can be obtained.

As described above, according to the present invention, it is possible to accurately estimate the mill constant of each rolling mill and the plasticity coefficient of the rolled material in each rolling mill in the rolling state of the rolled material, which has not been possible in the past. It is possible to improve the accuracy of the plate thickness or width of the rolled material, and it is also possible to improve the accuracy of control such as automatic plate thickness control or automatic plate width control.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams explaining the operation of a rolling mill, and FIG. 3 is a configuration diagram showing a device for estimating the mill constant of a rolling mill and the plasticity coefficient of a rolled material according to an embodiment of the present invention. . In the figure, 1 is an upper work roll, 2 is a lower work roll, 3, 3a, 3b, 3c, 3d are rolled materials or rolled material parts, 4a, 4b, 4c are rolling machines, 5,
7 is a plate thickness measuring device, 6 and 8 are variable thickness signals, 9a, 9
b, 9c, 9d are rolling material movement speed measuring devices, 10
a, 10b, 10c, 10d are rolling material movement speed signals, 11a, 11b, 11c are rolling reaction force detectors,
12a, 12b, 12c are rolling reaction force fluctuation calculation devices; 13a, 13b, 13c are rolling reaction force fluctuation signals; 14a, 14b, 14c, 19a, 19b,
19c, 23 are storage/transfer devices, 15a, 15
b, 15c are rolling reaction force fluctuation signals after transfer, 16
a, 16b, 16c are roll gap detectors, 17
a, 17b, 17c are roll gap variation calculation devices;
18a, 18b, 18c are roll gap fluctuation signals;
20a, 20b, 20c are roll gap variation signals after transfer, 21a, 21b, 21c are outlet side plate thickness variation calculation devices, 22a, 22b, 22c are outlet side plate thickness variation signals, 24 are variation thickness signals after transfer, 25a, 2
5b, 25c, 25d are estimation devices; in the figure,
The same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. In a device in which a rolled material is rolled by two or more consecutive rolling mills, a device for detecting fluctuations in rolling reaction force of the i-th rolling mill and outputting a signal of the fluctuation; A device that detects a variation in the roll gap of the i-th rolling mill and outputs the variation signal, and a device that stores the rolling reaction force variation signal and the roll gap variation signal, and detects the corresponding detected portion of the rolled material at the (i+1)th rolling mill. a storage device that outputs the stored rolling reaction force fluctuation signal and roll gap fluctuation signal at the timing of arrival at the location of the rolling mill;
1) A device that detects fluctuations in the rolling reaction force of the th rolling mill and outputs a fluctuation signal thereof, and a device that calculates fluctuations in the thickness of the exit side directly under the (i+1)th rolling mill and outputs a fluctuation signal of the thickness of the sheet directly under the rolling mill. a rolling reaction force variation signal, a roll gap variation signal, a rolling reaction force variation signal of the (i+1)th rolling mill, and a plate thickness variation signal on the outlet side immediately below the (i+1)th rolling mill outputted by the storage device; The mill constant of the i-th rolling mill and the (i-th
+1) A device for estimating a rolling mill constant and a plasticity coefficient of a rolled material, including a device for estimating a plasticity coefficient of a rolled material in a rolling mill. 2. In a device in which a rolled material is rolled in the width direction by two or more consecutive rolling mills, a device for detecting fluctuations in the rolling reaction force of the i-th rolling mill and outputting a signal of the fluctuation; A device that detects fluctuations in the roll gap of a rolling mill and outputs a fluctuation signal thereof, and a device that stores the rolling reaction force fluctuation signal and roll gap fluctuation signal and detects the corresponding detected portion of the rolled material of the (i+1)th rolling mill. a storage device that outputs the stored rolling reaction force fluctuation signal and roll gap fluctuation signal at the timing of arrival at the position;
1) A device that detects fluctuations in the rolling reaction force of the th rolling mill and outputs a fluctuation signal thereof, and a device that calculates fluctuations in the width of the exit side strip directly below the (i+1)th rolling mill and outputs a fluctuation signal of the width of the strip directly below the rolling mill. a rolling reaction force variation signal, a roll gap variation signal, a rolling reaction force variation signal of the (i+1)th rolling mill, and an exit side plate width variation signal immediately below the (i+1)th rolling mill outputted by the storage device; The mill constant of the i-th rolling mill and the (i-th
+1) A device for estimating a rolling mill constant and a plasticity coefficient of a rolled material, including a device for estimating a plasticity coefficient of a rolled material in a rolling mill.