JP2009113100A - Plate thickness controller of rolling mill, and plate thickness control method of rolling mill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure accuracy of a plate thickness at a final stand outlet by correcting an error of a mass flow estimated plate thickness generated in a transient situation such as acceleration or deceleration period of a rolling mill, through mass flow AGC in the continuous rolling mill. <P>SOLUTION: A first outlet side plate velocity is obtained by a first outlet side velocity computing portion 400, based on roll velocity at an inlet side of the rolling mill, an inlet side plate thickness, and an outlet side plate thickness immediately under a first rolling mill stand which is computed through a gage meter system, then using the first outlet side plate velocity, a second outlet side plate velocity, and the first outlet side plate thickness, the mass flow estimated plate thickness of a second rolling mill stand is obtained by a second mass flow plate thickness computing portion 601. After performing transfer processing of the gage meter plate thickness of the first rolling mill stand taking account of a delay time up to a plate thickness detector, an actual result of the plate thickness measured by the first outlet side plate thickness detector and the gage meter plate thickness are compared by a GM plate thickness correction computing portion 402 to obtain the error of the gage meter plate thickness. The mass flow estimated plate thickness of the second rolling mill stand is corrected by a second mass flow plate thickness correction computing portion 602. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rolling control device and a rolling control method for a continuous rolling mill that controls the thickness of a rolled sheet material.

  In recent years, with the development of speedometers using semiconductor lasers, mass flow AGC (Automatic) that detects the speed of the rolled sheet and determines the estimated thickness (mass flow estimated thickness) directly under the rolling mill to control the thickness Gauge Control) is popular.

  When mass flow AGC is applied to a continuous rolling mill, it is necessary to install an expensive plate thickness meter and plate speed meter in each stand, which is costly. Therefore, a method has been proposed in which the plate speed meter and the plate thickness meter are omitted, and the mass flow plate thickness is estimated by a model or estimation calculation.

  For example, the plate speed on the exit side of one stand can be calculated from the plate speed on the rolling mill entry side, the entry side plate thickness, and the gauge meter plate thickness. However, in these methods, an error in the mass flow estimation plate thickness occurs in a transient situation such as when the rolling mill is accelerated or decelerated, and there is a problem that the accuracy of the plate thickness cannot be ensured.

Based on these problems, the thickness meter installed on the exit side of the continuous rolling mill and the speed detectors installed on the entry side and exit side of the final stand are used directly below the second rolling mill from the last. A plate thickness calculation correction method has been proposed that corrects the calculated plate thickness value to improve the plate thickness calculation accuracy (see Patent Document 1). This is a technique for correcting the thickness calculation of the previous stand using a thickness gauge on the exit side of the rolling mill.
JP 2005-34893 A

  However, since the first stand outlet side thickness gauge 202 is installed at a position away from the first rolling mill stand 101 as in the technique shown in FIG. 1 described later, the mass flow thickness of the second rolling mill stand 102 is set. It cannot be used when calculating. This is because it is not possible to obtain the outlet side plate thickness directly below the first rolling mill stand 101.

  Therefore, an estimated plate thickness just below the first rolling mill stand 101 is obtained using some thickness measurement model such as a gauge meter method, and the second rolling mill stand is entered when calculating the mass flow plate thickness of the second rolling mill stand at the subsequent stage. Mass flow plate thickness calculation is performed as the side plate speed.

This plate thickness measurement model performs plate thickness measurement using the load Δp of the rolling mill stand and the roll gap S.
In that case, the problem that the error at the time of calculating the estimated thickness of the first rolling mill stand remains as a mass flow thickness estimation error after the second rolling mill stand in the subsequent stage occurs.

  Therefore, the present invention realizes a high-accuracy mass flow AGC while minimizing the number of installed plate thickness meters and plate speed meters, so that even if there is an error in the delivery side plate speed estimation, the mass flow plate thickness estimation error is reduced. It aims at preventing affecting the mass flow sheet thickness estimated value of the back | latter stage stand of a continuous rolling mill.

  In order to achieve the above object, the sheet thickness control device for a rolling mill stand according to the present invention is the final rolling (n: n ≧ 3) more than the first rolling mill stand, the second rolling mill stand, and the third rolling mill stand. A plate thickness control device for controlling a plate thickness of a continuous rolling mill stand that continuously rolls a plate material having a mill stand, the first plate speed installed in a roll on the first rolling mill stand entry side A detector, a first thickness detector installed on the entry side of the first rolling mill stand, a second thickness detector installed on the exit side of the first rolling mill stand, and a final rolling mill stand A third sheet thickness detector installed on the exit side of the rolling mill, and second to nth installed on the exit side of all rolling mill stands from the second rolling mill stand to the final (nth) rolling mill stand A plurality of plate speed detectors, the first pressure detected by the first plate speed detector The plate speed obtained from the roll speed on the machine stand entry side, the entry side plate thickness of the first rolling mill stand detected by the first sheet thickness detector, and directly below the first rolling mill stand measured by the gauge meter method. Based on the exit side plate thickness, the plate speed on the exit side of the first rolling mill stand is obtained, and the obtained exit side plate speed of the first rolling mill stand and the second rolling measured by the second plate speed detector. The mass flow estimated plate thickness of the third to n-th rolling mill stands is obtained from the plate speed on the outlet side of the mill stand and the first rolling mill stand outlet-side plate thickness measured by the second plate thickness detector. Yes.

  In addition, in a preferred embodiment of the present invention, in the plate thickness control device for the rolling mill stand, in determining the mass flow estimated plate thickness of the final (n) rolling mill stand, the rolling mill stand is directly below the first rolling mill stand measured by a gauge meter method. Mass flow estimation plate thickness data is calculated based on the delay time for transferring the plate material from the position immediately below the first rolling mill stand to the second plate speed detector on the second rolling mill stand exit side. The third rolling mill stand calculated by the gauge meter method based on the mass flow estimated plate thickness directly under the second rolling mill stand where the transfer processing was performed, and the mass flow estimated plate thickness data of the rolling mill stand was transferred. The mass flow estimation plate thickness of the final (nth) rolling mill stand is obtained.

  Furthermore, a preferred embodiment of the present invention obtains a correction amount of the estimated mass flow plate thickness of the second rolling mill stand based on the error of the plate thickness immediately below the first rolling mill stand calculated by the gauge meter method. By correcting the estimated mass flow thickness of the second rolling mill stand, the estimated mass flow thickness of the third to final (nth) rolling mill stand is calculated from the corrected mass flow estimated thickness of the second rolling mill stand. It is characterized by seeking.

  The method for controlling the thickness of a rolling mill stand according to the present invention is a continuous plate having a final (n: n ≧ 3) rolling mill stand higher than the first rolling mill stand, the second rolling mill stand, and the third rolling mill stand. A thickness control method for controlling the thickness of a continuous rolling mill stand that performs the rolling process of the first rolling mill, a step of obtaining a plate speed for conveying a plate material from a roll speed on the first rolling mill stand entry side, A step of detecting a first plate thickness of the plate on the entry side of the stand, a step of detecting a second plate thickness of the plate on the exit side of the first rolling mill stand, and an entry side of the first rolling mill stand Calculating the plate speed on the outlet side of the first rolling mill stand from the first plate thickness of the first rolling mill stand and the plate speed on the inlet side of the first rolling mill stand; Detect gauge meter plate thickness by meter method A step of calculating a mass flow plate thickness of the first rolling mill stand by performing a correction operation on the detected gauge meter plate thickness based on the detected plate thickness on the outlet side of the first rolling mill stand; and Then, the mass flow plate thickness of the final stage (nth) rolling mill stand above the second rolling mill stand and the third rolling mill stand is obtained by the same procedure.

  According to the plate thickness control apparatus and control method for a rolling stand of the present invention, in a continuous rolling mill stand having a plurality of rolling mill stands, a rolling mill having an inlet side thickness gauge, an outlet side thickness gauge, and an inlet side sheet speed detecting means. Estimate the plate speed on the stand exit side using a gauge meter method, calculate the mass flow plate thickness of the subsequent rolling mill stand, measure the exit plate thickness with the exit side thickness meter, and based on the results, measure the mass flow plate of the subsequent stand I am trying to correct the thickness. Thereby, propagation of the mass flow plate thickness estimation error from the subsequent rolling mill stand to the subsequent rolling mill stand can be prevented, and highly accurate plate thickness control can be realized.

  In addition, the number of expensive plate speedometers can be reduced. In addition, even if a failure occurs in the thickness measuring instrument provided on the exit side of each stage of the rolling mill stand, the mass flow thickness can be obtained by calculation. It can be easily applied to.

  According to the present invention, the speed of the exit side of the first rolling mill stand is obtained by calculation, and the mass flow thickness calculation of the next rolling mill stand is performed using this calculated value. For this reason, even if there is no plate speedometer on the first rolling mill stand exit side, it is possible to improve the calculation of the plate thickness accuracy and mass flow estimation plate thickness accuracy on the next rolling mill stand exit side, There is an effect that the thickness accuracy on the exit side of the final stand can be improved.

  In addition, the error at the time of calculating the plate thickness by the gauge meter is corrected, and the mass flow calculation of the rolling mill stand after the next stage is sequentially performed using the corrected plate thickness. Therefore, the accuracy of the estimated mass flow thickness at the rolling mill stand after the next rolling mill stand is improved, and a thickness gauge is installed between the stand from the next rolling mill stand exit side to the final rolling mill stand entry side. There is no need to do so, and the cost can be reduced.

  For equipment with plate speed gauges and thickness gauges installed in all rolling mill stands, mass flow AGC is applied even if the plate speed gauge or thickness gauge after the next rolling mill stand fails. It becomes possible to do.

  First, before describing an embodiment of the present invention, a technique which is a premise of the present invention will be schematically described with reference to FIG.

FIG. 1 is a diagram for explaining a rolling control device and a control method of a rolling mill stand, which is a premise of the present invention.
FIG. 1 shows an example in which the plate speed on the exit side of the rolling mill stand is calculated from the plate speed on the entry side of the rolling mill stand, the plate thickness on the entry side, and the gauge meter plate thickness. That is, in the exit side speed calculation device 710 of the first rolling mill stand, if the rolling mill entry side plate thickness H ₁ , entry side plate speed V _1e and exit side plate thickness h ₁ can be detected, V _1o = (H ₁ / h ₁ ) The outgoing speed V _1o can be obtained from the mass flow equation of V _1e .

Here, the rolling mill entry side thickness H ₁ is determined by the first rolling mill entry side thickness gauge 201 of the stand. Further, the delivery side plate thickness h ₁ is obtained by the delivery side plate thickness meter 202 of the first rolling mill stand. The entry side speed V _1e is obtained by an entry side roll speed meter (not shown).

Hereinafter, the outline operation | movement is demonstrated about the rolling control apparatus and control method shown in FIG.
First, the plate thickness h _1GM immediately below the first rolling mill stand 101 is _obtained by, for example, a gauge meter type plate thickness meter. Then, in the first _delivery side plate speed estimation value device 715, from this plate thickness h _1GM , the entry side plate speed V _1e , the entry side plate thickness H ₁ and the exit side plate thickness h _i , the equation (H ₁ / h _1GM ) · V _1oGM of the 1st rolling mill stand 101 is _{calculated |} required by estimating an exit side plate speed by V _1e .

Then, the mass flow plate thickness h _2mf of the second rolling mill stand 101 is calculated by the second mass flow plate thickness calculator 711. The mass flow plate thickness h _2mf of the second rolling mill stand 101 is obtained by (V _1oGM / V _2o ) · H ₂ . Here, V _2o and H ₂ represent the plate speed on the exit side and the plate thickness on the entry side of the second rolling mill stand 102, respectively.

Here, as described above, in the second delivery side speed calculation device 710, the rolling mill entry side plate thickness H ₁ , the entry side plate using the actual plate thickness h ₁ detected by the first rolling mill stand exit side plate thickness meter 202. From the speed V _1e , the first rolling mill stand exit side plate speed actual measurement value V _1o is obtained by the formula (H ₁ / h ₁ ) · V _1e .

_Based on the error between this actual _delivery side plate speed V _1o and the _delivery side plate speed estimation value V _1oGM , the _delivery side plate speed estimation error corrector 720 _{obtains an} estimation error of the mass flow plate thickness of the second rolling mill stand. The mass flow plate thickness of the second rolling mill stand in the thickness transporter 721 is corrected.

That is, in the mass flow plate thickness transfer device 721, the mass flow plate thickness of the second rolling mill stand is determined, and the corrected mass flow plate thickness of the third rolling mill stand is obtained assuming that the plate material is transferred to the third rolling mill stand position. I have to. The third rolling mill stand mass flow plate thickness h _3mf is obtained by the formula V _3e / V _3o · h _2mf based on the mass flow plate thickness h _2mf of the second rolling mill stand 102. However, V _3e and V _3o are plate speeds on the entrance side and exit side of the third stand, respectively.
Thereby, in the 3rd rolling mill stand 103 or later, it becomes possible to control with an accurate mass flow plate thickness using the first rolling mill stand outlet side plate speed.

Based on the plate thickness control apparatus and method for a rolling mill stand as the premise of the present invention described above, an embodiment of the present invention will be described below with reference to FIGS.
FIG. 2 shows a configuration example of the continuous rolling mill of the three rolling mill stand according to the present embodiment.

Here, the arbitrary rolling mill stand in the continuous rolling mill is from the first rolling mill stand 101 to the third rolling mill stand 103, but the number of stages is not limited to three, and the n (n ≧ 3) Can be extended to a rolling mill stand.
And a plate speedometer is installed in the entrance side and exit side of the rolling mill stand after the 3rd rolling mill stand 103, and a plate speedometer is not installed in the entrance side and exit side of the 1st rolling mill stand 101. FIG.

  It is only necessary to install a total of three thickness gauges on the entrance and exit sides of the first rolling mill stand 101 and the exit side of the final stand. This is the minimum necessary number of continuous rolling mills.

The operation of the rolling mill stand thickness control device of the present invention will be described below.
First, the gauge meter plate thickness calculation unit 401 calculates the gauge meter plate thickness directly below the first rolling mill stand 101 using the formula 1 from the gap (rolling position) of the first rolling mill stand 101 and the rolling load.

  Next, the transfer processing device (B → C) 501 transfers sheet pressure data in consideration of the delay time from the position immediately below the first rolling mill stand 101 to the thickness gauge 202 provided on the first rolling mill stand exit side. To obtain the gauge meter plate thickness just below the plate thickness meter 202 on the outlet side of the first rolling mill stand. This transfer process takes into account the delay time associated with the transfer of the plate material from directly below the first rolling mill stand 101 (point B in the figure) to the position of the first plate thickness gauge 202 (point C in the figure). This is a process of correcting the plate thickness measured by the two plate thickness gauges to the plate thickness just below the first stand.

Next, in the GM (gauge meter) plate thickness correction calculation unit 402, the gauge meter plate thickness just below the first rolling mill stand 101 is compared with the actual measured value of the plate thickness measured by the plate thickness meter 202, and is shown in the following equation (2). Thus, the gauge meter plate thickness correction term ε is obtained. In Equation 2, h _x1 is a measured thickness value measured by the second thickness gauge 202, and h _{GM (Tracking)} is a value obtained by transferring the gauge meter plate thickness by the transfer processing device 501. Also, C ₁ is the integral time constant, rolling speed or may be a variable that is changed according to the transfer delay time.
Further, the GM plate thickness correction calculation unit 402 may be a first-order lag between the gauge meter plate thickness transferred by the transfer processing device 501 and the plate thickness actual measurement value.

Next, in the gauge meter plate thickness calculation unit 401, the gauge meter plate thickness correction term ε obtained by the GM plate thickness correction calculation unit 402 is added to the gauge meter plate thickness, and the corrected gauge meter plate thickness h _GM1 is obtained. Ask. Further, in the transfer processing apparatus (A → B) 500, an actual measured value of the inlet side thickness is obtained by the thickness gauge 201 on the first rolling mill stand entry side, and the first rolling mill is obtained from the first rolling mill stand entry side thickness gauge 201. Transfer processing in consideration of the delay time to the stand is performed, and the entry side plate thickness just below the first rolling mill stand 101 is obtained. Similarly to the transfer processing device (B → C) 501, the transfer processing in the transfer processing device (A → B) 500 is also performed in consideration of the plate material transfer time from point A to point B in the figure. This is a process of correcting the actual measurement value by.

Next, a plate speed V _1e on the entry side of the first rolling mill stand 101 is obtained by the entry side speed detection device 300. The plate speed V _{1e on the} entry side can be obtained from the peripheral speed of a roll in contact with the material to be rolled, called a bridle roll or a pinch roll.

Here, in the present embodiment, the plate speed V _1d on the exit side of the first rolling mill stand 101 is the plate speed V _1e on the entrance side of the first rolling mill stand, which is obtained as described above, directly below the first rolling mill stand 101. The first exit side speed calculation unit 400 obtains the entry side plate thickness H _{1e (Tracking)} and the gauge meter plate thickness h _GM1 corrected by the exit thickness meter 202 on the exit side of the first rolling mill stand 101 from Equation (3). Can do.

Next, in the transfer processing device (C → D) 502, the second thickness from the thickness meter 202 on the first rolling mill stand exit side is compared with the actual thickness measured on the thickness meter 202 on the first rolling mill stand exit side. Transfer processing in consideration of the delay time to the rolling mill stand 102 is performed to determine the entry side plate thickness h _{1d (Tracking)} immediately below the second rolling mill stand 102.

Next, in the second mass flow plate thickness calculator 601, the second rolling mill stand 102 entry-side plate thickness h _{1d (Tracking)} and the plate speed V _1d on the first rolling mill stand exit side obtained by the equation ₍ 2 ₎ , Using the plate speed V _2d on the second rolling mill stand outlet side measured by the plate speed meter 302 on the second rolling mill stand outlet side, the estimated mass flow thickness h _mf2 on the outlet side of the second rolling mill stand 102 is obtained.

However, the mass flow estimated plate thickness _hmf2 includes a component of an error Δε of the gauge meter plate thickness of the first rolling mill stand 101.
The error Δε of the gauge meter plate thickness of the first rolling mill stand 101 is determined when the part to be rolled that has been rolled by the first rolling mill stand 101 reaches directly below the plate thickness meter 202 on the first rolling mill stand exit side. It can be calculated by comparing the gauge meter plate thickness with the actual measured value h _x1 of the plate thickness meter 202 on the outlet side of the first rolling mill stand.

At this time, if the portion to be rolled of the first rolling mill stand 102 is at a distance L ₂ from the second rolling mill stand 102, the distance L ₂ is from the first rolling mill stand 101 to the first rolling mill stand exit side plate. From the distance L ₁ to the thickness gauge 202, the plate speed V _1d on the exit side of the first rolling mill stand 101, and the plate speed V _2d on the exit side of the second rolling mill stand 101, it can be obtained as shown in Equation 4.

Next, in the transfer processing apparatus (D → E) 503, the mass flow estimation plate thickness of the second rolling mill stand 102 is transferred in consideration of the delay time of the distance L ₂ , and the distance L from the second rolling mill stand 102 is determined. _The estimated mass flow thickness h _{mf2 (Tracking)} at point E of ₂ is obtained. Then, in the second mass flow plate thickness correction calculation unit 602, the corrected mass flow estimated plate thickness _hmf2c is obtained based on Formula 5.

Next, by the transfer processing device (E → F) 504, the corrected mass flow estimated plate thickness of the second rolling mill stand 102 is changed from the position (point E) of the second delivery side plate speed meter 302 to the third rolling mill stand 103. An accurate mass flow estimated plate thickness h _{mf2c (Tracking} ) in which a transfer process is performed in consideration of a delay time until immediately below (point F), and an error on the third rolling mill stand entry side immediately below the third rolling mill stand 103 is corrected. ₎ . Therefore, the corrected mass flow estimated plate thickness can be obtained in the stand subsequent to the third rolling mill stand 103.

FIG. 3 is an example of an embodiment in which the present invention is applied to a continuous rolling mill stand having five rolling mill stands.
In the present embodiment, a thickness gauge 200 is installed on the entry side of the first rolling mill stand 101 and a thickness gauge 201 is installed on the exit side. And the thickness gauge 205 is installed in the 5th (final) rolling mill stand delivery side, and a total of 3 thickness gauges are installed.

  The plate speedometer is installed on the exit side of each rolling mill stand from the second rolling mill stand to the fifth rolling mill stand. That is, the plate speedometer 302 is installed on the exit side of the second rolling mill stand 102, and similarly, the plate speedometers 303 to 305 are installed on the exit side of the third to fifth rolling mill stands 103 to 105, respectively. is set up.

The entry side speed detection device 300 detects the entry side roll speed of the first rolling mill stand 101. And this detected speed is taken as the speed of the material 1 to be rolled on the first rolling mill stand 101 entry side. In addition, the first entrance side thickness gauge 200 measures the thickness on the entry side of the first rolling mill stand 101. In the transfer processing apparatus (A → B) 500, the sheet thickness data is transferred from the first entry side thickness gauge 200 (point A) to the first rolling mill stand 101 (point B) according to the entry side speed. And the entry side plate thickness H _{1e (Tracking)} directly under the first rolling mill stand 101 is obtained.

Further, in the first rolling mill stand 101, the gauge meter plate thickness h _GM1 is obtained from the load P and the roll gap S of the first rolling mill stand. And in the transfer processing device (B → C) 501, the first rolling mill stand exit side thickness gauge from the first rolling mill stand 101 (point B) according to the material speed of the rolled material on the exit side of the first rolling mill stand 101. Up to 201 (C point), the transfer process of the gauge meter plate thickness h _GM1 is performed.

The GM (gauge meter) plate thickness correction calculation unit 402 obtains the gauge meter plate thickness h _{GM1 (Tracking) for} which the transfer process has been performed and the measured value of the exit side plate thickness measured by the exit side plate thickness meter 201 of the first rolling mill stand. Compare and integrate the difference (or apply a first order lag). Thereby, the error ε of the gauge meter plate thickness is obtained. Then, the gauge meter plate thickness calculation unit 401 corrects the gauge meter plate thickness of the first rolling mill stand 101 based on the obtained error ε.

Next, in the first delivery side speed calculation unit 400, the corrected gauge meter plate thickness h _GM1 , the first rolling mill stand entry side plate thickness H _{1e (Tracking)} immediately below the first rolling mill stand 101, and the entry side speed results. From V _1e , the plate speed V _1d on the first rolling mill stand exit side is obtained.

  Here, in the correction of the gauge meter plate thickness by the GM plate thickness correction calculation unit 402, the delay time caused by the transfer time of the first exit side plate thickness gauge 201 from the first rolling mill stand 101 and the time of integration of the correction calculation device A delay time due to a constant or first-order delay occurs.

  Therefore, the gauge meter plate thickness can be increased during acceleration and deceleration, in transitional conditions such as plate width change of non-rolled material, surface quality fluctuation, hardness unevenness, friction fluctuation due to lateral shift of work roll and intermediate roll. An error Δε occurs.

As described above, the calculated value V _1d of the exit side plate speed of the first rolling mill stand 101 obtained from the gauge meter plate thickness includes an error Δε of the gauge meter plate thickness. When the error Δε of the gauge meter plate thickness occurs, the calculated value V _1d of the _delivery side plate thickness meter 201 of the first rolling mill stand 101 becomes h _x1 / (h _x1 + Δε) times the actual plate speed.

Therefore, the actual mass flow plate thickness h _mf2c is _Obtained by _multiplying the mass flow plate thickness h _mf2 of the second rolling mill stand 102 obtained by the 2 mass flow plate thickness computation unit 601 by (h _x1 + Δε) / h _x1 obtained by the second mass flow plate thickness correction computation unit 602. be able to.

Here, the distance from the first rolling mill stand 101 to the first exit side thickness gauge 201 L ₁ and _(m), to be rolled section 1 which is rolled in the first rolling mill stand 101 to the first exit side thickness gauge 201 Assuming that the material 1 rolled by the second rolling mill stand 102 advances by L ₂ (m) before reaching, from the speed on the first rolling mill stand exit side and the speed on the second rolling mill stand exit side, L ₂ can be obtained as L ₂ = L ₁ × V _2d / V _1d .

Therefore, in the transfer processing device (D → E) 503, the mass flow estimated plate thickness h _{mf2 (Tracking)} of the second rolling mill stand 102, which has been transferred from the second rolling mill stand 102 by L ₂ (m), An accurate mass flow plate thickness h _mf2c can be obtained by multiplying (h _x1 + Δε) / h _x1 by the second mass flow plate thickness correction calculation unit 602.

In the transfer processing device (E → F) 504, the corrected mass flow plate thickness h _mf2c is _moved from the second rolling mill stand 102 to the position L ₂ (m) (point E) and the third rolling mill stand 103 (point F). A transfer process is performed in consideration of the delay time until the entry side plate thickness of the third rolling mill stand is obtained. Further, the third mass flow plate thickness calculator 603 is calculated from the outlet plate speed of the second rolling mill stand measured by the second outlet plate speedometer 302 and the third rolling mill stand outlet side plate speed measured by the third outlet plate speedometer 303. Thus, the third stand mass flow estimated plate thickness h _mf3c can be accurately obtained.

The third rolling mill stand mass flow estimated plate thickness _{hmf3c thus} determined takes into account the delay time from the third rolling mill stand 103 to the fourth rolling mill stand 104 in the transfer processing device (F → G) 505. Thus, the entrance side plate thickness of the fourth rolling mill stand 104 is obtained. Then, in the fourth mass flow plate thickness calculator 604, the exit plate speed of the third rolling mill stand 103 measured by the third exit plate speed meter 303 and the fourth rolling mill stand 104 measured by the fourth exit plate speed meter 304. From the exit side plate speed, the estimated mass flow thickness _{mf4c of} the fourth rolling mill stand 104 is obtained.

The mass flow estimated plate thickness _mf4c of the fourth rolling mill stand 104 is determined by the fifth rolling in consideration of the delay time from the fourth rolling mill stand 104 to the fifth rolling mill stand 105 in the transfer processing device (G → H) 506. Transfer processing to the machine stand 105 is performed, and the entry side plate thickness of the fifth rolling mill stand 105 is obtained. Then, in the fifth mass flow plate thickness calculator 605, the exit side plate speed of the fourth rolling mill 4 stand 104 measured by the fourth exit side plate speed meter 304 and the fifth rolling mill stand measured by the fifth exit side plate speed meter 305. From the _delivery side plate speed, the estimated mass flow thickness h _{mf5c of} the fifth rolling mill stand 105 is obtained.

Further, the estimated mass flow thickness h _mf5c of the fifth rolling mill stand 105 is a delay time from the fifth rolling mill stand 105 (point H) to the fifth outlet thickness gauge 205 in the transfer processing device (H → I) 507. Transfer processing is performed in consideration of Then, the fifth mass flow plate thickness correction calculation unit 606 compares the measured value of the delivery side plate thickness measured by the fifth delivery side plate thickness meter 205 to obtain the correction value η of the fifth stand mass flow plate thickness.

The mass flow plate thickness _hmf5c of the fifth rolling mill stand 105 is _corrected by the fifth mass flow plate thickness calculation unit 605 by the correction value η obtained by the fifth mass flow plate thickness correction calculation unit 606. For this reason, the first side of the first rolling mill stand 101 and the third side of the fifth rolling mill stand 102 are the inlet side thickness gauge 200, the outgoing side thickness gauge 201, and the fifth rolling mill stand 105. The final stage (fifth) rolling due to an error associated with the transfer of the material 1 to be rolled by disposing the four plate speedometers 302, 303, 304, 305 installed on the exit side to the 5-roller stand 105 The error in the estimated mass flow thickness of the machine stand 105 is corrected.

Next, the operation of this embodiment will be described in more detail based on the flowchart shown in FIG. 4 to FIG.
FIG. 4 is a flowchart showing the operation of the continuous rolling mill of the three rolling mill stand.
In FIG. 4, first, in the continuous rolling mill of the 3 rolling mill stand, the first inset side plate speed is detected (step S1). Specifically, the first stage entry side speed is determined by an entry side roll speed meter.

Next, first plate thickness detection is performed (step S2). Specifically, the detection of the first stage entry side thickness is obtained by the entry side thickness gauge 201 of the first rolling mill stand.
The first entry side plate thickness detected in step S2 is subjected to a transfer process in the transfer processing apparatus (A → B) 500 (step S3).

And gauge meter plate | board thickness calculation is performed (step S4). Specifically, the gauge meter plate thickness immediately below the first rolling mill stand 101 is calculated by the gauge meter plate thickness calculation unit 401 from the gap (the rolling position) of the first rolling mill stand and the rolling load.
The gauge meter plate thickness calculated in step S4 is transferred by the transfer processing device (B → C) 501 (step S5).

The plate thickness on the first unwinding side is measured by the plate thickness meter on the unloading side of the first rolling mill stand (step S6).
Here, the correction calculation of the gauge meter plate thickness calculated in step S4 is performed (step S7). Specifically, the GM (gauge meter) plate thickness correction calculation unit 402 obtains a correction term for the gauge meter plate thickness, and the gauge meter plate thickness calculation unit 401 obtains the gauge meter obtained by the GM plate thickness correction calculation unit 402. The correction term of the plate thickness is added to the gauge meter plate thickness, and the corrected gauge meter plate thickness is obtained.

  Then, the first stage exit side speed calculation is performed (step S8). Specifically, the plate speed on the entry side of the first rolling mill stand is obtained by the entry side speed detection device 300. The plate speed on the exit side of the first rolling mill stand is based on the first step-side plate speed detected in step S1, the first step-side plate thickness transferred in step S3, and the gauge meter plate thickness corrected in step S7. The first exit side speed calculation unit 400 can obtain this value.

Next, the thickness of the first delivery side measured in step S6 is transferred by the transfer processing device (C → D) 502 (step S9).
The delivery-side plate speed measured second by the plate-speed meter on the delivery side of the second rolling mill stand is detected (step S10).

  Then, the second stage mass flow plate thickness calculation is performed (step S11). Specifically, in the second mass flow thickness calculator 601, the first delivery side plate thickness transferred in step S9 and the first delivery side plate speed obtained in step S8, the second measured in step S10. The second stage mass flow estimated plate thickness is obtained using the step side plate speed.

The second stage mass flow plate thickness calculated in step S11 is transferred by the transfer processing device (D → E) 503 (step S12).
Then, a second mass flow plate thickness correction calculation is performed (step S13). Specifically, in the second mass flow plate thickness correction calculation unit 602, the second stage mass flow plate thickness transferred in step S12 is corrected using the correction term obtained in step S7, and the corrected mass flow estimation is performed. Thickness is required.

Next, the corrected second stage mass flow plate thickness calculated in step S13 is transferred by the transfer processing device (E → F) 504 (step S14).
The 3rd stage exit side plate speed measured with the plate speedometer of the 3rd stage rolling mill stand exit side is detected (step S15).

  Then, a third stage mass flow plate thickness correction calculation is performed (step S16). Specifically, in the third mass flow plate thickness correction calculation unit 603, the third stage mass flow estimated plate thickness is obtained using the corrected second stage mass flow plate thickness transferred in step S14.

The above description is the operation in the case of a three-roller stand, but is not limited to this, and can be applied to the case of a K (> 3) -stage mill.
The operation of the K (> 3) stage rolling mill stand will be described below.
FIG. 5 is a flowchart showing the operation of the K (> 3) stage rolling mill stand. FIG. 5 is a continuation of the operation of FIG.

In FIG. 5, it is determined whether there are three or more next stages (step S21). Next, it is determined whether the speedometer on the exit side of the corresponding stand K stage is unusable (step S22). It is determined whether the exit side thickness gauge of the corresponding stand K stage can be used (step S23).
When the next stage is three or more stages, the K-stage outlet-side speedometer cannot be used, and the K-stage outlet-side thickness gauge can be used, the K + 1 stage outlet-side mass flow plate thickness is corrected.

  First, calculate the K-stage gauge meter plate thickness, calculate the K-stage exit side plate speed from the K-stage gauge meter plate thickness, K-stage entry side speed, and K-stage entry side plate thickness, and calculate the K + 1 stage exit-side mass flow plate thickness. (Step S24).

  The K-stage gauge meter plate thickness is transferred to the K-stage outlet-side thickness gauge (step S25), and the K-stage outlet-side thickness gauge is detected by the K-stage outlet-side thickness gauge (step S26).

The K-stage outlet side plate thickness is compared with the transferred K-stage gauge meter plate thickness, and the K + 1 stage outlet-side mass flow plate thickness is corrected.
If the next stage is less than three stages, the K-stage exit-side speedometer can be used, and if the K-stage exit-side thickness gauge is not available or cannot be used, the process is terminated.

As described above, in the embodiment of the present invention, since the accurate mass flow estimated plate thickness can be obtained by the third rolling mill stand 103, the accurate mass flow plate thickness is subsequently obtained from the fourth to the final rolling mill stand. It becomes possible.
And since the measurement precision of mass flow estimation board thickness improves, the precision of board thickness control can be raised. As a result, the plate thickness accuracy on the exit side of the final rolling mill stand is improved.

  In this embodiment, the error of the gauge meter plate thickness of the first rolling mill stand 101 is calculated and the mass flow estimated plate thickness of the third rolling mill stand 103 is corrected. Not only, but the gauge meter plate thickness is calculated at an arbitrary rolling mill stand after the second rolling mill stand 102, and the mass flow estimated plate thickness is corrected at the rolling mill stand at the second stage of the rolling mill stand. It is also possible to improve accuracy. The plate thickness control device and the control method of the present invention are applicable to a rolling mill system having three or more rolling mill stands.

  FIG. 6 compares the estimated mass flow thicknesses with and without plate thickness correction according to the embodiment of the present invention. FIG. 6A shows a case with correction, and FIG. 6B shows a case without correction. The solid lines are the mass flow estimated plate thickness deviations 611 and 613, and the broken lines are the measured values (actual results) 610 and 612 of the plate thickness deviations measured by the plate thickness meter.

  In the case of no plate thickness correction shown in FIG. 6B, the difference between the mass flow estimated plate thickness deviation 611 and the plate thickness deviation record 610 is large, and the difference between the mass flow estimated plate thickness deviation 611 and the plate thickness deviation record 610 is 5 μm or more. It has become.

  In the case of plate thickness correction shown in FIG. 6A, the error between the mass flow estimated plate thickness deviation 613 and the plate thickness deviation record 612 is within 3 μm, and the mass flow estimated plate thickness deviation 613 is It almost matches.

  The present invention can be applied to a continuous rolling mill using three or more rolling mill stands. However, the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention. Needless to say.

It is a figure for demonstrating the rolling control apparatus and control method of a rolling mill stand used as the premise of this invention. It is a figure which shows the structural example of the continuous rolling mill of the 3 rolling mill stand by one embodiment of this invention. It is a figure which shows the embodiment of the continuous rolling mill stand of 5 rolling mill stands. It is a flowchart which shows operation | movement of a 3 rolling mill stand. It is a flowchart which shows operation | movement of the rolling mill stand of K (> 3) stage. FIG. 6A shows a comparison of estimated mass flow thicknesses with and without mass flow plate thickness correction, FIG. 6A shows correction, and FIG. 6B shows no correction.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 ... 1st rolling mill stand, 102 ... 2nd rolling mill stand, 103 ... 3rd rolling mill stand, 201 ... 1st entrance side plate thickness meter, 202 ... 1st exit side plate thickness meter, 302 ... 2nd exit side plate speed meter , 303... Third exit side plate speed meter, 300... Entrance side speed detection device, 400... First exit side speed calculation unit, 401 ... Gauge meter plate thickness calculation unit, 402 ... GM plate thickness correction calculation unit, 500. Part (A → B), 501... Transfer processing part (B → C), 502... Transfer processing part (C → D), 503... Transfer processing part (D → E), 504. , 601... Second mass flow plate thickness calculator, 602... Second mass flow plate thickness correction calculator, 603.

Claims (6)

Thickness of a continuous rolling mill stand that has a final (n: n ≧ 3) rolling mill stand that is higher than the first rolling mill stand, the second rolling mill stand, and the third rolling mill stand, and that performs continuous rolling of the plate material. A plate thickness control device for controlling
A first plate speed detector installed on the first rolling mill stand entry side;
A first plate thickness detector installed on the entry side of the first rolling mill stand;
A second sheet thickness detector installed on the exit side of the first rolling mill stand;
A third thickness detector installed on the exit side of the final rolling mill stand;
A plurality of second to nth plate speed detectors installed on the exit side of all rolling mill stands from the second rolling mill stand to the final (nth) rolling mill stand;
With
The plate speed obtained from the plate speed detector on the first rolling mill stand entry side detected by the first plate speed detector and the first rolling mill stand detected by the first plate thickness detector. Based on the inlet side plate thickness and the outlet side plate thickness directly below the first rolling mill stand measured by the gauge meter method, the plate speed on the outlet side of the first rolling mill stand is obtained,
The obtained exit side plate speed of the first rolling mill stand, the exit side plate speed of the second rolling mill stand measured by the second plate speed detector, and the second plate thickness detection. A plate thickness control device for a rolling mill stand, characterized in that a mass flow estimation plate thickness of the third to n-th rolling mill stands is obtained from the first rolling mill stand exit side plate thickness measured by a mill. In the plate | board thickness control apparatus of the rolling mill stand of Claim 1,
In determining the estimated mass flow thickness of the final (nth) rolling mill stand,
Mass flow estimated plate thickness data of the plate thickness immediately below the first rolling mill stand measured by the gauge meter method, from directly below the first rolling mill stand to the second plate speed detector on the exit side of the second rolling mill stand. In consideration of the delay time for the transfer of the plate material, mass transfer estimated sheet thickness data transfer processing of the second rolling mill stand,
The estimated mass flow thickness of the final (nth) rolling mill stand above the third rolling mill stand calculated by the gauge meter method based on the estimated mass flow thickness immediately below the second rolling mill stand that has performed the transfer process. A sheet thickness control device for a rolling mill. In the plate thickness control apparatus of the rolling mill stand according to claim 2,
Based on the error of the plate thickness just below the first rolling mill stand calculated by the gauge meter method, a correction for the mass flow estimated plate thickness of the second rolling mill stand is obtained,
The corrected mass plate thickness of the second rolling mill stand is corrected by the correction amount, and the third to final (nth) rolling mill stand is determined based on the corrected mass flow estimated plate thickness of the second rolling mill stand. An apparatus for controlling the thickness of a rolling mill, characterized in that an estimated mass flow thickness is obtained. The thickness of the continuous rolling mill stand that has a final (n: n ≧ 3) rolling mill stand that is equal to or higher than the first rolling mill stand, the second rolling mill stand, and the third rolling mill stand, and performs continuous rolling of the plate material. In the plate thickness control method to control,
From the roll speed on the first rolling mill stand entry side, obtaining a plate speed for conveying the plate material;
Detecting a first plate thickness of the plate on the entry side of the first rolling mill stand;
Detecting a second plate thickness of the plate on the exit side of the first rolling mill stand;
Calculating a plate speed on the exit side of the first rolling mill stand from the first plate thickness on the entry side of the first rolling mill stand and the plate speed on the entry side of the first rolling mill stand; ,
Detecting the thickness of the gauge immediately below the first rolling mill stand by a gauge meter method;
Calculating the mass flow plate thickness of the first rolling mill stand by performing a correction operation on the detected gauge meter plate thickness based on the detected plate thickness on the outlet side of the first rolling mill stand; and ,
Thereafter, the mass flow plate thickness of the final (nth) rolling mill stand above the second rolling mill stand and the third rolling mill stand is obtained by a similar procedure. In the thickness control method of the rolling mill stand according to claim 4,
The mass flow estimation plate thickness data of the plate thickness just below the first rolling mill stand measured by the gauge meter method is obtained from the plate material from directly below the first rolling mill stand to a predetermined position on the exit side of the second rolling mill stand. In consideration of the delay time for the transfer, the step of transferring the mass flow estimated plate thickness data of the second rolling mill stand;
The estimated mass flow thickness of the final (nth) rolling mill stand above the third rolling mill stand calculated by the gauge meter method based on the estimated mass flow thickness immediately below the second rolling mill stand that has performed the transfer process. A method for controlling the thickness of a rolling mill stand, further comprising the step of: In the sheet thickness control method of the rolling mill stand according to claim 5,
Based on the error of the plate thickness just under the first rolling mill stand calculated by the gauge meter method, obtaining a correction for the mass flow estimated plate thickness of the second rolling mill stand;
The corrected mass plate thickness of the second rolling mill stand is corrected by the correction amount, and the third to final (nth) rolling mill stand is determined based on the corrected mass flow estimated plate thickness of the second rolling mill stand. A plate thickness control method for a rolling mill stand, further comprising the step of obtaining a mass flow estimation plate thickness.

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