JP2017042813A - Control method and control device of sizing press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control method and a control device of a sizing press capable of properly correcting opening of the sizing press, while reducing a measurement place of a plate width of a rolled material more than usual.SOLUTION: An actual value of a width control error of a rolled material and a press load of a sizing press is collected by the past N-time operation, and a least square method is applied to the collected actual value, and a relational expression of the width control error and the press load is determined, and a relational expression of an opening error and the press load of the sizing press is determined based on the determined relational expression. The press load in the sizing press is predicted, and an opening error corresponding to a prediction value of the press load is determined by using the relational expression of the opening error and the press load, and this is set as the prediction value of the opening error. Set opening of the calculated sizing press is corrected by the prediction value of the opening error.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a control method and control device for a sizing press that presses a steel slab in the width direction.

Patent Document 1 discloses a method for controlling the plate width of a rolled material by carrying out reduction control of a press slab width reduction device provided on the entry side of a roughing mill when performing continuous hot rolling. It is disclosed. In this method, the width of the rolled material is measured on the exit side of the rolling mill, and the press is performed based on the difference between the actually measured width value in the measurement and the target width value at the measurement position (hereinafter referred to as “width control error”). Correct the reduction setting value of the slab width reduction device.
The hot rolling line disclosed in Patent Document 2 includes a sizing press, an entry-side slab width meter, and an exit-side slab width meter. The sizing press has a pair of press dies arranged opposite to each other with a slab in between, and sequentially presses the slab with a pair of press dies in the longitudinal direction while conveying the slab. The opening of the sizing press is set via an opening setting driving device. The entry side slab width meter is installed on the entry side of the sizing press. The exit slab width meter is installed on the exit side of the sizing press.
In Patent Document 2, when the width of the slab 1 is pressed, a width press amount error is obtained by measuring the width press exit side slab width with an exit side slab width meter. The opening of the sizing press is corrected for the slab.

JP-A-62-40919 JP 2010-194601 A

  By the way, in patent document 2, since it is necessary to measure the plate | board width of a rolling material in the entrance side and exit side of a sizing press in order to determine the opening error of a sizing press, the cost of rolling equipment increases. End up. Also, on the entry side of the sizing press, it is often difficult to secure a space for installing the width meter.

  The present invention has been made in view of such circumstances, and its main purpose is to appropriately correct the opening of the sizing press while reducing the number of measurement points of the sheet width of the rolled material as compared with the conventional art. An object of the present invention is to provide a control method and control device for a sizing press that can be used.

  In order to solve the above-described problem, the sizing press control method according to one aspect of the present invention is the sizing press that presses the rolled material in the width direction based on the set opening, and the pressed rolled material. A method for controlling the sizing press in the case of horizontal rolling with a horizontal rolling mill, the step of predicting the press load in the sizing press, and the target of the sheet width when the rolled material is rolled in the past by the horizontal rolling mill Predicting the opening error of the sizing press corresponding to the predicted press load based on the relationship between the width control error that is the difference between the measured value and the press load in the sizing press; Determining a set value of the opening in the sizing press based on the opened opening error.

  In this aspect, the relationship between the width control error and the press load may be determined based on a plurality of actual values of the width control error and the press load.

  In the above aspect, in the step of determining the relationship between the width control error and the press load, when one coordinate axis of orthogonal coordinates is the width control error and the other coordinate axis is the press load, The relationship may be determined by applying a least square method to the actual value.

  Further, in the above aspect, the sizing press control method includes pressing the rolled material in the width direction with the sizing press set according to the determined set value of the opening, and the pressed rolling material is subjected to a horizontal rolling mill. Based on the actual value of the width control error when horizontal rolling is performed and the predicted value of the opening error obtained from the relationship between the opening error and the press load, the width control error and the press load You may further have the step which updates a relationship.

  In the above aspect, in the step of predicting the press load, the press load may be calculated based on a deformation resistance of the rolled material and a contact area of the rolled material with a die of the sizing press.

  In the above aspect, in the step of predicting the press load, the actual value of the press load when the rolled material rolled by the horizontal rolling mill is pressed in the width direction by the sizing press is calculated as the predicted value of the press load. It is good.

  Further, the control device for the sizing press according to one aspect of the present invention presses the rolled material in the width direction based on the set opening by the sizing press, and the pressed rolling material is horizontally rolled by a horizontal rolling mill. A control device for controlling the sizing press, a press load predicting means for predicting a press load in the sizing press, and a target value of a sheet width when the rolled material is rolled in the past by the horizontal rolling mill The opening error of the sizing press corresponding to the press load predicted by the press load predicting means is predicted based on the relationship between the width control error which is the difference between the measured value and the press load in the sizing press. An opening error predicting means for performing the opening error prediction based on the opening error predicted by the opening error predicting means And a determining means for determining the set value of the definitive opening.

  ADVANTAGE OF THE INVENTION According to this invention, the opening degree of a sizing press can be correct | amended appropriately, reducing the measurement location of the plate width of a rolling material compared with the past.

The schematic diagram which shows the structure of the hot rolling line which concerns on embodiment. The perspective view which shows schematic structure of a sizing press. The block diagram which shows the structure of the control apparatus of the sizing press which concerns on embodiment. The flowchart which shows the procedure of control operation | movement of the sizing press by a control apparatus. The graph which shows distribution of the width control error of a rolling material. The graph which shows the relationship between an opening degree error and a press load. The graph which shows distribution of the width control error of the rolled material after improvement.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[Configuration of hot rolling line]
FIG. 1 is a schematic diagram showing a configuration of a hot rolling line according to the present embodiment. The hot rolling line 100 includes a heating furnace 200, a sizing press 300, rough rolling machines 400 and 401, and a finishing rolling machine 500.

  A transfer machine 210 is provided on the entrance side of the heating furnace 200. The transfer machine 210 is for transferring the continuously cast slag (rolled material) to the heating furnace 200, and includes a thermometer and a distance meter for measuring the width of the slag. The rolled material is supplied to the heating furnace 200 by the transfer machine 210 and heated by the heating furnace 200.

  The rolled material heated by the heating furnace 200 is supplied to the sizing press 300. The sizing press 300 presses the rolled material in the width direction.

  The rolled material pressed by the sizing press 300 is supplied to the roughing mills 400 and 401 and the finishing mill 500 which are horizontal rolling mills, and is rolled by the roughing mills 400 and 401 and the finishing mill 500.

  FIG. 2 is a perspective view showing a schematic configuration of the sizing press 300. The sizing press 300 includes a pair of press dies 301. The pair of press dies 301 are disposed apart from each other in the horizontal direction, and can approach and separate from each other. The rolling material 600 is supplied between the pair of pressing dies 301, and the pressing die 301 presses the rolling material 600 down from both sides. The sizing press 300 conveys the rolled material 600 in the longitudinal direction (arrow direction in the figure).

  In the sizing press 300, it is possible to set an opening that is a separation distance between the pair of press dies 301. The sizing press 300 presses the rolled material 600 according to the set opening. The width of the rolled material 600 after pressing is a size corresponding to the opening. Further, the sizing press 300 includes a pressure sensor, and can measure a press load when the rolled material 600 is pressed.

  When the rolled material 600 is rolled by the rough rolling machines 400 and 401 and the finish rolling machine 500, the width of the rolled material 600 is expanded. The sizing press 300 is for adjusting the width dimension of the rolled material 600 before rolling so that the width of the rolled material 600 after rolling becomes a target value.

  A measuring unit 410 that measures the width of the rolled material 600 is provided on the exit side of one rough rolling mill 401.

  A control device 700 is connected to the sizing press 300. The control device 700 is for controlling the sizing press 300. The control device 700 is connected to the measurement unit 410 and is configured to receive measurement values output from the measurement unit 410.

[Configuration of control device]
FIG. 3 is a block diagram showing the configuration of the control device for the sizing press according to the present embodiment. The control device 700 is realized by a computer 701. As illustrated in FIG. 3, the computer 701 includes a main body 710, an input unit 720, and a display unit 730. The main body 710 includes a CPU 711, ROM 712, RAM 713, hard disk 715, reading device 714, input / output interface 716, image output interface 717, and communication interface 718.

  The CPU 711 can execute a computer program loaded in the RAM 713. Then, when the CPU 711 executes a press control program 740 that is a computer program for controlling the sizing press 300, the computer 701 functions as the control device 700. The press control program 740 controls the opening degree of the sizing press 300 and enables the width of the rolled material 600 after rolling to be controlled.

[Operation of control device]
Hereinafter, the control operation of the sizing press 300 by the control device 700 will be described. FIG. 4 is a flowchart showing the procedure of the control operation of the sizing press 300 by the control device 700.

  First, the CPU 711 of the control device 700 initializes a variable n (step S101). n indicates what number the rolled material 600 to be rolled is rolled by the hot rolling line 100. That is, n is the number of operations of the hot rolling line 100. The initial value of n is 1. Note that n is reset to 1 when the press die 301 of the sizing press 300 is replaced.

Next, the CPU 711 calculates a set opening degree of the sizing press 300 (step S102). In this process, the amount of enlargement of the width of the rolled material (so-called width return amount) after the rolled material 600 passes through the rough rolling mills 400 and 401 is estimated so that the rolled material 600 has a predetermined width, and sizing is performed. The press amount of the rolled material 600 by the press 300, that is, the opening degree W _SP ^cal (n) is calculated.

ここで、α（Ｔ）は、圧延材における室温（例えば、２０℃）からＴ℃までの平均線膨張係数を、ＷｍＲＴは、室温での圧延材６００の幅を、Ｗｍは、移載機２１０での圧延材６００の実測幅を、Ｔｍは、移載機２１０での実測幅Ｗｍを測定したときの圧延材６００の温度を、ＴＳは、加熱炉２００の出側における圧延材６００の温度を、それぞれ示している。 For the calculation of the opening degree W _SP ^cal (n), the width WS of the rolled material 600 on the outlet side of the heating furnace 200 (that is, the inlet side of the sizing press 300) is used. The width WS can be estimated by the following equation, for example.

Here, α (T) is the average linear expansion coefficient from room temperature (for example, 20 ° C.) to T ° C. in the rolled material, WmRT is the width of the rolled material 600 at room temperature, and Wm is the transfer machine 210. , Tm is the temperature of the rolled material 600 when the measured width Wm of the transfer machine 210 is measured, and TS is the temperature of the rolled material 600 on the exit side of the heating furnace 200. , Respectively.

  Next, the CPU 711 determines whether n is a predetermined value N or less (step S103). N is the minimum number of rolling records necessary for predicting the opening error of the sizing press 300 (the number of rolled materials rolled in the past by the rolling line 100), and is 10, for example.

  When n is N or less (YES in step S103), CPU 711 determines the set opening calculated in step S102 as the opening command value of sizing press 300 (step S104). The control device 700 gives the opening command value to the sizing press 300 and controls the sizing press 300. Thereby, the sizing press 300 presses the rolled material 600 with the commanded opening degree.

  The rolled material 600 pressed at the commanded opening degree is horizontally rolled by rough rolling machines 400 and 401. The measuring unit 410 measures the width of the rolled material 600. Further, the sizing press 300 measures a press load when the rolled material 600 is pressed. The control device 700 receives the measured value of the width of the rolled material 600 after rolling from the measuring unit 410 and receives the measured value of the press load from the sizing press 300.

ここで、ＷＲ２^ａｃｔ（ｎ）は、測定部４１０によって得られたｎ番目の圧延材６００の幅の測定値を示し、ＷＲ２^ｃａｌ（ｎ）は、ｎ番目の圧延材６００の幅の目標値を示す。 The CPU 711 calculates the width control error δWR2 (n) of the rolled material 600 after the horizontal rolling by the rough rolling mill 401 by the following formula (step S105).

Here, WR2 ^act (n) indicates a measured value of the width of the n-th rolled material 600 obtained by the measuring unit 410, and WR2 ^cal (n) indicates a target value of the width of the n-th rolled material 600. Show.

  The CPU 711 associates the calculated width control error δWR2 (n) with the press load received from the sizing press 300, and stores them in the hard disk 715 as the actual value (step S106).

  In the hot rolling line 100, the rolling process of the rolled material 600 is completed. When the new rolled material 600 is not rolled (YES in step S107), the CPU 711 ends the process.

  When rolling new rolled material 600 (NO in step S107), CPU 711 increments n by 1 (step S108), and returns the process to step S102. The next continuously rolled material 600 is supplied to the hot rolling line 100 and rolling is started again.

By repeating the processes in steps S101 to S108, the operation assuming that the width control error is 0 is performed on the N rolled material 600. Thereby, a set δWR2 [1 to N] of width control errors in the latest N rolled materials 600 and a set δP _SP ^act [1 to N of measured values of the press load of the sizing press 300 in the latest N rolled materials 600. ] Is recorded.

  When n is larger than N in step S103 (NO in step S103), the CPU 711 predicts the press load of the sizing press 300 (step S109).

ここで、Ｐ_ＳＰは、サイジングプレス３００のプレス荷重を、ｋ_ｆｍは、圧延材６００の平均変形抵抗を、Ｑは、補正項を、Ｓは、圧延材６００におけるプレス金型３１０との接触面積をそれぞれ示している。 The following formula can be used to predict the press load.

_Here, the contact area of the _{P SP} is press load of sizing press _{300, k fm} is the mean deformation resistance of the rolled material 600, Q is a correction term, S is a press die 310 in the rolling member 600 Respectively.

  In addition, the measured value of the press load in the vicinity of the front end portion of the rolled material 600 is calculated.

  Next, the CPU 711 calculates the offset error a (n−1) of the sizing press 300 and the load proportional constant b (n−1) used to calculate the deflection due to the press load based on the actual value stored in the hard disk 715. Is calculated (step S110).

  Here, the offset error a (n−1) and the load proportional constant b (n−1) will be described. FIG. 5 is a graph showing the distribution of the width control error of the rolled material 600. In FIG. 5, the vertical axis represents the width control error, and the horizontal axis represents the press load in the sizing press 300.

As shown in FIG. 5, when the press load is zero, the width control error is an offset error a (n−1). As the press load increases, the width control error increases approximately linearly (so-called deflection error). Therefore, the control device 700 approximates the relationship between the press load and the width control error using the following method of least squares to determine the offset error a (n−1) and the load proportional constant b (n−1). To do.

  The relationship between the press load and the width control error can be approximated by a multidimensional curve instead of a straight line.

Next, the CPU 711 creates a relational expression between the opening degree error and the press load based on the expression indicating the relation between the press load and the width control error determined in Step S110 (Step S111). In this step S111, it is considered that the opening degree error is equal to the width control error. That is, among the relational expressions between the press load and the width control error, the relational expression between the opening degree error and the press load is created by replacing the width control error with the opening degree error. The following equation shows the relational expression between the created opening degree error and the press load.

上式において、Ｗ_ＳＰはサイジングプレス３００の出側での圧延材６００の幅を、ΔＷＲ２は粗圧延機４００，４０１の水平圧延による幅戻り量をそれぞれ示す。ΔＷＲ２は、サイジングプレス３００の圧下量等に基づいて算出される（幅戻り予測式）。 Here, the reason why the opening degree error and the width control error can be regarded as equal will be described. The plate width predicted value WR2 ^cal of horizontal rolling is given by the following equation.

In the above _{equation, W SP} is the width of the strip 600 on the outlet side of the sizing press 300, ΔWR2 denotes the width return amount by the horizontal rolling rough rolling mill 400 and 401, respectively. ΔWR2 is calculated based on the amount of reduction of the sizing press 300 (width return prediction formula).

このうち、水平圧延前の幅の誤差については、サイジングプレス３００の開度にδｘの変化があるとすると、サイジングプレス３００による圧延材６００のプレス後の幅、つまり水平圧延前の幅にδｘの変化を生じる。これは水平圧延後の幅にもおおむねδｘの変化を生じると近似できる。 The width control error in horizontal rolling can be classified into an error in width of the rolled material 600 before horizontal rolling and an error in width return amount ΔWR2 due to horizontal rolling. That is, it is expressed as the following equation.

Among these, regarding the error of the width before horizontal rolling, if there is a change of δx in the opening of the sizing press 300, the width after pressing the rolled material 600 by the sizing press 300, that is, the width before horizontal rolling is δx. Make a change. This can be approximated by causing a change in δx in the width after horizontal rolling.

  On the other hand, regarding the error of the width return amount ΔWR2, ΔWR2 is strongly influenced by the cross-sectional shape (bulge shape) of the rolled material 600 after being pressed. However, since the reduction amount of the sizing press 300 is on the order of several hundred millimeters, even if an opening change δx of several millimeters occurs, the influence on the sectional shape of the rolled material 600 itself is small. Therefore, the opening degree change δx of the sizing press 300 has little influence on the width return amount ΔWR2 after horizontal rolling.

  In summary, the width control error after horizontal rolling when the sizing press 300 has an opening error is mainly due to the width error of the rolled material 600 before horizontal rolling, and the width return amount ΔWR2 in horizontal rolling. , I.e., δ (ΔWR2) is small and can be ignored. That is, if there is a width return prediction formula with a certain degree of accuracy, the width control error in horizontal rolling may be regarded as the sizing press opening error as it is.

  Next, the CPU 711 obtains an opening error corresponding to the predicted value of the press load obtained in step S109 by using the relational expression (1) between the above opening degree error and the press load. An opening error is predicted (step S112).

FIG. 6 is a graph showing the relationship between the opening degree error and the press load. As shown in the figure, the opening degree error δW _SP ^cal (n) corresponds to the predicted value P _SP ^cal (n) of the press load. In step S112, such δW _SP ^cal (n) is obtained as a predicted value of the opening degree error.

Next, the CPU 711 determines the opening command value W _SP ^set (n) of the sizing press 300 by the following equation (step S113).

The control device 700 gives the opening command value to the sizing press 300 and controls the sizing press 300. Thereby, the sizing press 300 presses the rolled material 600 with the commanded opening degree. As shown in the above equation (2), the set value W _SP ^cal (n) of the opening of the sizing press 300 is set to an opening error δW _SP ^cal (n) regarded as equal to the width control error δWR2 (n). By correcting, the opening command value W _SP ^set (n) is determined. For this reason, the width control error is suppressed, and the accuracy of the width dimension of the rolled material 600 after rolling is improved.

  In addition, since a relational expression between the width control error and the press load is determined in consideration of a so-called deflection error, which is a change in the width control error accompanying a change in the press load, an opening created based on this relational expression is determined. By using the relational expression between the degree error and the press load, the opening degree of the sizing press 300 can be controlled so as to suppress the deflection error. The deflection error is caused by the pressing force from the rolled material to the sizing press 300, and the deflection error increases as the press load of the sizing press 300 increases. Therefore, by determining the relational expression as described above, the opening of the sizing press can be accurately controlled even when the press load varies greatly depending on the rolled material.

  The rolled material 600 pressed at the commanded opening degree is horizontally rolled by rough rolling machines 400 and 401. The measuring unit 410 measures the width of the rolled material 600. Further, the sizing press 300 measures a press load when the rolled material 600 is pressed. The control device 700 receives the measured value of the width of the rolled material 600 after rolling from the measuring unit 410 and receives the measured value of the press load from the sizing press 300.

As described above, the width control error of the rolled material 600 is improved. FIG. 7 is a graph showing the distribution of width control error after improvement. The width control error is reduced to δWR2 ^RES (n) shown in FIG. Hereinafter, the improved width control error is referred to as a width prediction residual of the rolled material 600 after rolling. The CPU 711 calculates a width prediction residual δWR2 ^RES (n) from the measured value WR2 ^act (n) of the width of the rolled material 600 after rolling and the set value WR2 ^set (n) of the width of the rolled material 600 ( Step S114).

Since the width control error of the rolled material 600 is improved, if this is used as it is as the actual value, the correction amount of the opening set value is reduced, and the control of the width of the rolled material 600 is deteriorated. The improvement of the width control error is brought about by correcting the opening degree set value with the opening degree error which is regarded as being equal to the predicted value of the width control error. Accordingly, an error obtained by adding an opening degree error to the improved width control error can be said to be an original width control error in the case of no improvement. Therefore, the CPU 711 calculates a width control error δWR2 ′ (n) when the opening degree set value is not corrected by the following equation (step S115).

  By the above equation (3), the actual value of the width control error is corrected by the predicted value of the opening degree error.

  The CPU 711 stores the calculated width control error δWR2 ′ (n) and the press load received from the sizing press 300 in the hard disk 715 as actual values (step S116). In determining the relational expression between the width control error and the press load after the next time (step S110), the corrected actual value of the width control error is used and the relational expression is updated. That is, the relational expression between the width control error and the press load is updated based on the actual value (width prediction residual) of the width control error and the opening degree error. Since it is possible to accurately estimate the width control error when the opening set value is not corrected by the width prediction residual and the opening error, by accumulating the estimated width control error as the actual value, The accuracy of the relational expression between the width control error and the press load can be maintained. In addition, since the relational expression between the opening degree error and the press load is created in step S111 based on the relational expression between the width control error and the press load updated in this way, the influence due to the improvement of the width control error is affected. It is possible to maintain the prediction accuracy of the opening degree error without receiving it. In addition, an increase in the amount of accumulated result values improves the learning effect of opening degree error prediction and improves prediction accuracy.

  In the hot rolling line 100, the rolling process of the rolled material 600 is completed. When the new rolled material 600 is not rolled (YES in step S107), the CPU 711 ends the process.

  When rolling new rolled material 600 (NO in step S107), CPU 711 increments n by 1 (step S108), and returns the process to step S102. The next continuously rolled material 600 is supplied to the hot rolling line 100 and rolling is started again.

  With the control operation as described above, the opening error is predicted by the press load of the sizing press 300, and the opening command value of the sizing press 300 is determined so as to eliminate the opening error, which is one of the rolling conditions. The plate width of the rolled material can be controlled with high accuracy in accordance with the press load.

In the hot rolling line 100, since it is not necessary to provide a measurement unit for measuring the plate width on the entry side of the sizing press in order to determine the opening error of the sizing press 300, the equipment cost can be suppressed. . Moreover, even if it is the hot rolling line 100 in which it is difficult to ensure the installation space of the measurement part as described above on the entry side of the sizing press 300, the opening degree can be appropriately controlled.
Furthermore, in the method for controlling the opening of the sizing press 300 according to the present embodiment, the opening of the sizing press 300 can be set more appropriately because the influence of the deflection error of the sizing press is taken into account.

  Moreover, in order to determine the formula showing the relationship between the opening degree error and the press load based on the actual value of N or more, the formula reflects the tendency of the rolling operation of the hot rolling line 100. Can accurately predict the opening error.

(Other embodiments)
In the above embodiment, by adding the predicted value of the opening error to the width prediction residual, the actual value of the width control error is corrected, and the relational expression between the opening error and the press load is updated. Although described, it is not limited to this. It is good also as a structure used without updating the relational expression of the opening degree error produced based on N results value, and a press load.

  In the above embodiment, the configuration in which the control device 700 determines the relationship between the opening degree error and the press load has been described, but the present invention is not limited to this. The configuration may be such that the user determines a relational expression approximate to the actual value of the opening degree error and the press load, and the controller 700 uses this to predict the opening degree error.

  In the above embodiment, the least square method is applied to a plurality of actual values of the width control error and the press load, and the configuration for determining the relationship between the width control error and the press load has been described. It is not limited to this. A known supplemental method such as spline interpolation or Lagrangian interpolation may be applied to a plurality of actual values of the width control error and the press load to determine the relationship between the width control error and the press load.

  In the above embodiment, the configuration in which the opening degree of the sizing press 300 is controlled by the control device 700 configured by the computer 701 has been described. However, the present invention is not limited to this. The control device 700 can also be realized by an embedded control board for executing the opening control of the sizing press 300. In this case, a computer program for controlling the sizing press 300 may be stored in a non-volatile semiconductor memory, and the computer program may be executed by an embedded processor, or part or all of the control functions of the sizing press 300 May be realized by ASIC (Application Specific Integrated Circuit) or FPGA (Field Programmable Gate Array).

  The sizing press control method and control apparatus of the present invention are useful as a sizing press control method and control apparatus for pressing a steel slab in the width direction.

DESCRIPTION OF SYMBOLS 100 Hot rolling line 200 Heating furnace 300 Sizing press 400,401 Rough rolling mill 410 Measuring part 500 Finishing rolling mill 600 Rolled material 700 Control apparatus 711 CPU
715 hard disk

Claims (7)

A sizing press is a method for controlling the sizing press in a case where a rolled material is pressed in the width direction based on a set opening, and the pressed rolled material is horizontally rolled by a horizontal rolling mill,
Predicting a press load in the sizing press;
The press predicted based on the relationship between the width control error, which is the difference between the target value and the measured value of the sheet width when the rolled material is rolled by the horizontal rolling machine in the past, and the press load in the sizing press. Predicting an opening error of the sizing press corresponding to a load;
Determining a set value of the opening in the sizing press based on the predicted opening error;
A sizing press control method. The relationship between the width control error and the press load is determined based on a plurality of actual values of the width control error and the press load.
The sizing press control method according to claim 1. In the step of determining the relationship between the width control error and the press load, when one coordinate axis of orthogonal coordinates is set as the width control error and the other coordinate axis is set as the press load, the minimum is obtained with respect to the plurality of actual values. Determine the relationship by applying a square method,
The sizing press control method according to claim 2. The actual value of the width control error when the rolled material is pressed in the width direction by the sizing press set by the set value of the determined opening, and the pressed rolled material is horizontally rolled by a horizontal rolling mill. The step of updating the relationship between the width control error and the press load based on the predicted value of the opening error obtained from the relationship between the opening error and the press load.
The control method of the sizing press of Claim 2 or 3. In the step of predicting the press load, the press load is calculated based on the deformation resistance of the rolled material and the contact area of the rolled material with the die of the sizing press.
The method for controlling a sizing press according to any one of claims 1 to 4. In the step of predicting the press load, the actual value of the press load when the rolled material being rolled by the horizontal rolling mill is pressed in the width direction by the sizing press is used as the predicted value of the press load.
The method for controlling a sizing press according to any one of claims 1 to 4. A control device for controlling the sizing press when the rolled material is pressed in the width direction based on the set opening by a sizing press, and the pressed rolled material is horizontally rolled by a horizontal rolling mill,
A press load predicting means for predicting a press load in the sizing press;
Based on the relationship between the width control error, which is the difference between the target value and the measured value of the sheet width when the rolled material is rolled by the horizontal rolling machine in the past, and the press load in the sizing press, the press load prediction means An opening error predicting means for predicting an opening error of the sizing press corresponding to the press load predicted by
Determining means for determining a set value of the opening in the sizing press based on the opening error predicted by the opening error predicting means;
A sizing press control device.

Images