CN113056337B

CN113056337B - Rolling equipment and rolling method

Info

Publication number: CN113056337B
Application number: CN201980076224.1A
Authority: CN
Inventors: 小村明宽; 佐古彰; 日浦正; 武口达; 木之濑亮平; 古元秀昭; 金森信弥
Original assignee: Primetals Technologies Japan Ltd
Current assignee: Primetals Technologies Japan Ltd
Priority date: 2019-01-25
Filing date: 2019-01-25
Publication date: 2023-11-28
Anticipated expiration: 2039-01-25
Also published as: EP3914402A1; WO2020152868A1; EP3914402A4; JP7091560B2; JP2022510464A; CN113056337A

Abstract

The rolling mill is provided with a plate wedge control device, and is controlled according to the load (P) _W ) And a drive side load (P) _D ) A plate width direction distribution of a plate load applied to a rolled material (5) is obtained, a rolled wedge is calculated based on the plate width direction distribution of the plate load and a plate width direction position of the rolled material (5) set by a rolled material position setting device, a work roll gap difference between a work side and a drive side of an upper and lower pair of work rolls (21, 31) for setting the rolled wedge to a predetermined value is calculated, and a drive side hydraulic cylinder (11D) and a work side hydraulic cylinder (11W) are controlled so as to be the calculated work roll gap difference.

Description

Rolling equipment and rolling method

Technical Field

The present invention relates to a rolling apparatus and a rolling method.

Background

As an example of a method for simultaneously controlling the warpage and wedge shape of a rolled material in hot rolling, patent document 1 describes the following: the rolling material which is rolled in the width direction by the vertical rolling mill is restrained by the inlet side guide and guided to the horizontal rolling mill, the wedge shape of the rolling material is corrected by performing one-side pressing adjustment on the horizontal rolling mill, and the warp of the rolling material is corrected by the outlet side guide, thereby controlling the warp and the wedge shape at the same time.

Patent document 2 describes the following: to calculate a rolling mill bounce amount (an element in calculating a thickness of a gauge by using a function requiring high responsiveness such as automatic thickness control in hot rolling) promptly and accurately, for example, before a rolling mill starts an AGC operation, an influence coefficient composed of rolling mill bounce parameters for estimating the rolling mill bounce amount conforming to a material condition thereof is calculated for each rolling material in advance by using other functions in other devices according to a force theory model before a fixed time when the rolling material is engaged in a rolling mill, and the rolling mill bounce amount is estimated promptly and accurately by using rolling mill bounce parameters in a linear expression after the rolling material reaches the rolling mill by using a transmission circuit at an appropriate timing.

Prior art literature

Patent literature

Patent document 1: japanese patent No. 3241566

Patent document 2: japanese patent No. 2878060

Disclosure of Invention

The technique described in patent document 1 can control the plate tilting and the wedge at the same time, but it is necessary to remove the differential load due to the temperature from the differential load (differential load) measured value of the roll section and extract the differential load due to the plate wedge. That is, it is necessary to separate the differential load due to the plate wedge and the temperature difference. For this purpose, a device for measuring the temperature is required. In addition, this technique is greatly affected by the accuracy of the thermometer measurement. For these reasons, it is very difficult to achieve high-precision work roll gap difference correction.

The technique described in patent document 2 can control the plate thickness, but does not describe details of the plate width direction distribution of the plate load or the side guides on the entrance side and the exit side. In addition, the influence of the rolling mill constant difference on the working side and the driving side is not considered. The plate thickness at the center of the plate is calculated, and the concept of calculating the plate thickness on the working side and the driving side is not adopted, but there is a disadvantage that the plate wedge after rolling cannot be easily calculated.

The present invention has been made in view of the above problems, and an object thereof is to provide a rolling facility and a rolling method capable of controlling a plate wedge with a simple structure.

The present invention includes a plurality of means for solving the above problems, and provides a rolling mill including: a driving side hydraulic cylinder; a working-side hydraulic cylinder; a pair of upper and lower work rolls for rolling a rolling material by a downward pressure applied by the driving side hydraulic cylinder and the working side hydraulic cylinder; a driving side load detector for detecting a down force generated by the driving side hydraulic cylinder; a working side load detector for detecting a down force generated by the working side hydraulic cylinder; a rolling material position setting device for setting a plate width direction position of the rolling material introduced into the pair of upper and lower work rolls; and a plate wedge control device for adjusting the plate wedge of the rolled material after rolling, wherein the plate wedge control device is characterized by comprising: a plate wedge calculator that obtains a plate width direction distribution of a plate load applied to the rolling material from the load of the work side support portion and the load of the drive side support portion of the work roll detected by the drive side load detector and the work side load detector, and calculates a rolled plate wedge based on the obtained plate width direction distribution of the plate load and the plate width direction position of the rolling material set by the rolling material position setting device; a gap difference calculator for calculating a work roll gap difference between a work side and a drive side of the pair of upper and lower work rolls for setting the rolled plate wedge calculated by the plate wedge calculator to a predetermined value; and a gap difference controller that controls the driving side hydraulic cylinder and the work side hydraulic cylinder so as to become a work roll gap difference calculated by the gap difference calculator.

Effects of the invention

According to the invention, the wedge can be controlled by a simple structure. The problems, structures and effects other than those described above will be apparent from the following description of the embodiments.

Drawings

Fig. 1 is a diagram showing an example of a structure of a hot continuous rolling mill.

Fig. 2 is a diagram showing an example of the structure of a roughing mill and a heavy plate mill.

Fig. 3 is a plan view showing the structure of the plate wedge control device in embodiment 1 of the present invention.

Fig. 4 is a side view showing the structure of the plate wedge control device in embodiment 1.

Fig. 5 is a diagram illustrating the width direction distribution of the rolling load and the calculation method of the rolled wedge in the wedge control device in example 1.

Fig. 6 is a block diagram of the plate wedge control device in embodiment 1.

Fig. 7 is a graph showing the relationship between the work roll gap difference and the differential load in the case where the disturbance is the rolling front wedge under the conditions shown in table 1 of example 1.

Fig. 8 is a graph showing the relationship between the work roll gap difference and the rolled wedge plate in the case where the disturbance is the rolled wedge plate under the conditions shown in table 1 of example 1.

Fig. 9 is a graph showing the relationship between the work roll gap difference and the differential load in the case where the disturbance is the plate width direction temperature difference under the conditions shown in table 1 of example 1.

Fig. 10 is a graph showing the relationship between the work roll gap difference and the rolled sheet wedge in the case where the disturbance is the sheet width direction temperature difference under the conditions shown in table 1 of example 1.

Fig. 11 is a graph showing the relationship between the differential load and the roll gap difference correction amount on the working side and the driving side required to set the rolled wedge plate to 0 under the conditions shown in table 1 of example 1.

Fig. 12 is a graph showing the control result of the wedge plate in the test machine of example 1, and shows the relationship between the rolling distance from the start of the control and the differential load measurement value.

Fig. 13 is a graph showing the control result of the plate wedge in the test machine in example 1, and is a graph showing the relationship between the rolling distance from the start of control and the work roll gap difference correction amount.

Fig. 14 is a graph showing the control result of the plate wedge in the test machine in example 1, and is a graph showing the relationship between the rolling distance from the start of control and the target value and measured value of the plate wedge after rolling.

Fig. 15 is a graph showing a relationship between a calculated value and an actual measured value of a rolled wedge in the test machine in example 1.

Fig. 16 is a flowchart illustrating a control flow of the wedge in embodiment 1.

Fig. 17 is a plan view showing the structure of a plate wedge control device in embodiment 2 of the present invention.

Fig. 18 is a side view showing the structure of the plate wedge control device in embodiment 2.

Fig. 19 is a diagram showing a configuration for calculating rolling mill constants on the working side and the driving side of the rolling mill in example 2.

Fig. 20 is a diagram showing a rolling mill constant calculation method in example 2.

Fig. 21 is a flowchart illustrating a control flow of the wedge in embodiment 2.

Fig. 22 is a plan view showing the structure of a plate wedge control device in embodiment 3 of the present invention.

Fig. 23 is a side view showing the structure of the plate wedge control device in embodiment 3.

Fig. 24 is a flowchart illustrating a control flow of the wedge in embodiment 3.

Fig. 25 is a plan view showing the structure of a plate wedge control device in embodiment 4 of the present invention.

Fig. 26 is a side view showing the structure of the plate wedge control device in embodiment 4.

Fig. 27 is a block diagram of a plate wedge control device in embodiment 4.

Fig. 28 is a flowchart illustrating a control flow of the wedge in embodiment 4.

Fig. 29 is a plan view showing a structure of side guide positioning control in the plate wedge control device in embodiment 5 of the present invention.

Fig. 30 is a plan view showing the structure of a control plate wedge in the plate wedge control device according to embodiment 6 of the present invention.

Fig. 31 is a side view showing the structure of a plate wedge control device in example 6.

Fig. 32 is a diagram illustrating the width direction distribution of the rolling load and the calculation method of the rolled wedge in the wedge control device in example 6.

Fig. 33 is a flowchart illustrating a control flow of the wedge in embodiment 6.

Fig. 34 is a plan view showing a configuration for controlling the plate width direction of a rolled material, which is a modification of the plate wedge control device in example 6.

Detailed Description

Embodiments of the rolling apparatus and rolling method of the present invention are described below with reference to the drawings.

Example 1 >

Embodiment 1 of a rolling apparatus and a rolling method according to the present invention will be described with reference to fig. 1 to 16.

First, an outline of a rolling mill to which the present invention is preferably applied will be described with reference to fig. 1 and 2. Fig. 1 is a diagram showing an example of a structure of a general hot continuous rolling finishing mill, and fig. 2 is a diagram showing an example of a structure of a general roughing mill and a heavy plate mill.

The rolling mill shown in fig. 1 is a rolling mill commonly called a hot continuous rolling finishing mill, and includes: at least two or more horizontal rolling mills 1 for rolling a rolling material 5; an inlet side guide 2 which is disposed on the inlet side of the first horizontal rolling mill 1 and which sets the position in the plate width direction of the rolling material 5 introduced into the horizontal rolling mill 1; a hydraulic cylinder 6 for controlling the position of the entry side guide 2 in the plate width direction by a constant pressure; a plate wedge control device 40 for controlling the amount of hydraulic oil supplied to the hydraulic cylinder 11 in the first horizontal rolling mill 1; and a control device (not shown) for controlling the operations of various devices of the entire rolling mill, such as the amount of hydraulic oil supplied to the hydraulic cylinder 6.

The rolling mill shown in fig. 2 is a rolling mill commonly called a roughing mill or a heavy plate mill, and includes: a horizontal rolling mill 1 for rolling a rolling material 5; an entrance-side guide 2 disposed on the entrance side of the horizontal rolling mill 1 and an exit-side guide 3 disposed on the exit side for setting the position in the plate width direction of the rolled material 5 introduced into the horizontal rolling mill 1; a hydraulic cylinder 6A for controlling the position of the entry side guide 2 in the plate width direction by a constant pressure, and a hydraulic cylinder 6B for controlling the position of the entry side guide 3 in the plate width direction by a constant pressure; a plate wedge control device 41 for controlling the amount of oil supplied to the hydraulic cylinder 11 in the horizontal rolling mill 1; and a control device (not shown) for controlling the operations of various devices of the entire rolling mill, such as the amount of hydraulic oil supplied to the hydraulic cylinders 6A and 6B.

Next, details of the plate wedge control device provided in the rolling mill according to the present embodiment will be described with reference to fig. 3 to 6. Fig. 3 is a plan view showing the structure of the plate wedge control device in this embodiment 1, and fig. 4 is a side view showing the structure of the plate wedge control device in this embodiment 1.

In the following description, a case where a plurality of horizontal rolling mills 1 as shown in fig. 1 are provided as rolling mills provided with the plate wedge control device will be described, but the case where the present invention is applied to the rolling mill as shown in fig. 2 and the case where the present invention is applied to the rolling mill as shown in fig. 1 are not particularly changed.

The plate wedge control device 40 according to the present embodiment shown in fig. 1 and 3 is a device for adjusting the plate wedge of the rolled material 5 after passing through the rolling facility shown in fig. 1 by rolling the rolled material 5 on the basis of the horizontal rolling mill 1 having the entrance side guide 2 provided on the upstream side and the uppermost stream of the horizontal rolling mill 1 provided on the downstream side.

As shown in fig. 4, the horizontal rolling mill 1 controlled by the plate wedge control device 40 of the present embodiment includes: a driving side hydraulic cylinder 11D; a working-side hydraulic cylinder 11W; an upper work roll 21 and a lower work roll 31 of a pair of upper and lower rolls for rolling the rolled material 5 by the downward pressure applied by the driving side hydraulic cylinder 11D and the working side hydraulic cylinder 11W; an upper backup roll 22 and a lower backup roll 32 for supporting the upper work roll 21 and the lower work roll 31; a driving-side load detector 10D that detects a down force generated based on the driving-side hydraulic cylinder 11D; and a work side load detector 10W that detects a down force generated by the work side hydraulic cylinder 11W.

The driving side hydraulic cylinder 11D and the working side hydraulic cylinder 11W are provided with a displacement meter inside, and are configured to be able to measure cylinder oil column positions.

The driving-side load detector 10D and the working-side load detector 10W are preferably load cells, but a known device configured to be capable of detecting a load can be applied. The driving side load P of the driving side load detector 10D and the working side load detector 10W _D And a working side load P _W The measurement result of (a) is outputted to the wedge calculator 7 of the wedge control device 40.

As shown in fig. 3 and 4, the plate wedge control device 40 includes a plate wedge operator 7, a work roll gap difference operator 8, and a work roll gap difference controller 9.

The plate wedge operator 7 calculates a driving side load P based on the driving side load P detected by the driving side load detector 10D _D And a work side load P detected by the work side load detector 10W _W The plate width direction distribution of the plate load applied to the rolled material 5 was obtained.

The plate wedge calculator 7 calculates a rolled plate wedge based on the obtained plate width direction distribution of the plate load and the plate width direction position of the rolled material 5 set by the rolled material position setting device.

In the present embodiment, the rolling material position setting device that sets the position in the plate width direction of the rolling material 5 introduced into the pair of upper and lower work rolls 21, 31 is the entrance side guide 2 provided on the entrance side of the upper and lower work rolls 21, 31. In the case of the rolling mill shown in fig. 1, since the rolled material 5 is restrained from the stand 2 and thereafter, it can be determined that the rolled material 5 is substantially free from meandering. In this embodiment, therefore, the center of the rolling material 5 in the width direction is set to be equal to the centers of the upper work rolls 21 and the lower work rolls 31 in the width direction by the entry side guide 2 and the following stands 2, and the rolling rear wedge is calculated.

In the case of the rolling mill shown in fig. 2, the rolling material position setting device is an entrance side guide 2 and an exit side guide 3 provided on either one of the entrance side and the exit side of the horizontal rolling mill 1.

The following describes details of a method for calculating the wedge of the rolled material 5 in the wedge calculator 7, with reference to fig. 5. Fig. 5 is a diagram illustrating a width direction distribution of a rolling load and a calculation method of a rolled wedge in the wedge control device in example 1.

First, the plate wedge operator 7 receives the driving side load P in the driving side supporting portion from the driving side load detector 10D _D And receives the work side load P in the work side support portion from the work side load detector 10W _W According to the input of the driving side load P _D Load on working side P _W The plate width direction distribution of the plate load applied to the rolled material 5 as shown in fig. 5 was obtained.

Here, the force balance in the up-down direction in the rolled material 5 has a relationship of the following expression (1).

[ formula 1 ]

In the expression (1), P _D Is the driving side load detection value (kN), P _W Is the work side load detection value (kN), W is the plate width (mm), p of the rolled material 5 _d Is the rolling load per unit width (kN/mm), p, at the end of the drive side plate _w Is the rolling load per unit width (kN/mm) at the end of the working side plate.

In addition, the torque balance at the center in the width direction of the rolling mill in fig. 5, that is, at point a, has the relationship of expression (2) shown below.

[ formula 2 ]

In the expression (2), p (x) is a rolling load plate width direction distribution (kN/mm) per unit width, L is a working side to driving side inter-cylinder distance (mm), and x is a plate width direction position (mm) of the rolled material 5.

Here, the rolling load equation (linear distribution) per unit width of the rolled material 5 is a relationship of equation (3) shown below, and the limit range of x is a relationship of equation (4) shown below.

[ formula 3 ]

[ formula 4 ]

Based on the expression (2) calculated by substituting the relation between the expression (3) and the expression (4) and the expression (1), the rolling load p per unit width at the end of the driving side plate is calculated _d The rolling load p per unit width at the end of the working side plate can be expressed as the following expression (5) _w Can be expressed as the following expression (6).

[ formula 5 ]

[ formula 6 ]

From the formulas (5) and (6), the plate width direction distribution of the plate load can be obtained.

Next, the plate wedge calculator 7 applies the plate width direction distribution of the obtained plate load, analyzes the elastic deformation of the roll portion, and calculates the plate wedge after rolling.

In this analysis of the elastic deformation of the roll portion, the rolling back plate wedge is calculated in consideration of bending and shear deformation, flat deformation, and rigid displacement of WR and BUR shaft ends of WR (upper work roll 21 and lower work roll 31) and BUR (upper backup roll 22 and lower backup roll 32).

At this time, the unknowns (f (x, 1), y) shown in fig. 5 are calculated using the following equation (7) as a matrix operation equation, which is composed of (1) the balance equation of forces in the up-down direction of WR and BUR, (2) the torque balance equation of WR and BUR, and (3) the displacement continuity of the contact portion of WR and BUR ₁ ，y ₂ )。

[ formula 7 ]

In fig. 5 and expression (7), f (i, 1) is the load distribution between rolls, y ₁ 、y ₂ Is the displacement of the two ends of the roll shaft in the up-down direction, which is described as y ₁ (1)、y ₂ (1)、y ₁ (2)、y ₂ (2). Further, y1 represents a work roll, y2 represents a backup roll, (1) represents a work side, and (2) represents a drive side. In addition, a (i, j), c (1, i), c (2, i), c (3,i), c (4, i), b ₁ (i)、b ₂ (i) Representing the coefficient of influence.

From the roll deformation amount including the axial deflection amount and the flattening amount of the upper and lower work rolls and the upper and lower backup rolls calculated using the above expression (7), the surface profile (surface profile) between the rolled material 5, the upper work roll 21, and the lower work roll 31 is calculated.

From the obtained surface shape, a rolled plate wedge Δh (=drive side plate thickness h) is obtained _d Plate thickness h of working side _w ). At this time, the evaluation position of the plate thickness of the rolled material 5 can be arbitrarily determined, and it is generally desirable to set the position to be 25mm from the plate end.

Returning to fig. 3 and 4, the work roll gap difference calculator 8 calculates the gap difference between the upper work roll 21 and the lower work roll 31 on the work side and the drive side required to set the rolled plate wedge calculated by the plate wedge calculator 7 to a predetermined value.

The work roll gap difference controller 9 controls the driving side hydraulic cylinder 11D and the working side hydraulic cylinder 11W so as to be the work roll gap difference calculated by the work roll gap difference calculator 8.

The following describes a method of calculating the work roll gap difference in the work roll gap difference calculator 8 and details of control of the driving side hydraulic cylinder 11D and the working side hydraulic cylinder 11W in the work roll gap difference controller 9, with reference to fig. 6. Fig. 6 is a block diagram of the plate wedge control device in this embodiment 1.

In the work roll gap difference calculator 8, the wedge Δh (=drive side plate thickness h) on the work roll exit side calculated by the wedge calculator 7 is calculated _d Plate thickness h of working side _w ) With the desired plate wedge (out-side plate wedge target value deltah _ref ) Multiplying the deviation of (C) by an influence coefficient K including the plate wedge transfer rate (strip wedge transfer ratio) _s Further, a normal PID (Proportional-Integral-Differential) control is applied to calculate a work roll gap difference correction amount (a stroke difference between cylinder positions on the work side and the drive side). Then, the work roll gap difference calculator 8 outputs the calculated work roll gap difference correction amount to the work roll gap difference controller 9.

Here, the influence coefficient K _s Is to repair from the plate wedgeThe coefficient of conversion of the positive amount to the work roll gap difference correction amount can be provided by the following expression (8).

[ formula 8 ]

Here, in expression (8), ζ is a plate wedge transfer rate (-) at the plate end position, L is a working-side to driving-side cylinder distance (mm) similar to expression (2), and W is a plate width (mm).

In addition, the desired plate wedge (side plate wedge output target value Δh _ref ) The values are set by various methods, such as values input from a control device at a higher stage of the wedge control devices 40 and 41, and values input by an operator using an input device (not shown) of the wedge control devices 40 and 41.

The work roll gap difference controller 9 controls the oil column positions of the driving side hydraulic cylinder 11D and the working side hydraulic cylinder 11W so that the work roll gap difference correction amount calculated by the work roll gap difference calculator 8 can be obtained. For example, the calculated work roll gap difference correction amount is 1/2, and 1/2 of the work roll gap difference correction amount is subtracted from the driving side hydraulic cylinder 11D, and 1/2 of the work roll gap difference correction amount is added to the working side hydraulic cylinder 11W.

The control of the present embodiment described above is based on the following findings, which are first clarified by the present inventors, as will be described below: even if there is a wedge before rolling of the rolled material 5, even if there is a temperature difference in the plate width direction, the differential load is measured irrespective of these disturbances, and the work roll gap difference correction amount for setting the wedge to a predetermined amount is determined.

The following describes, with reference to fig. 7 to 15, the processes up to the control of the plate wedge control devices 40 and 41 according to the present invention (based on the derivation of the work roll gap difference correction amount by the plate wedge arithmetic unit 7 and the work roll gap difference arithmetic unit 8).

Fig. 7 is a graph showing the relationship between the work roll gap difference and the differential load in the case where the disturbance is the rolling front wedge under the conditions shown in table 1, and fig. 8 is a graph showing the relationship between the work roll gap difference and the rolling rear wedge in the case where the disturbance is the rolling front wedge under the conditions shown in table 1 of example 1. Fig. 9 is a graph showing the relationship between the work roll gap difference and the differential load in the case where the disturbance is the plate width direction temperature difference under the conditions shown in table 1 of the present example 1, and fig. 10 is a graph showing the relationship between the work roll gap difference and the rolled wedge. Fig. 11 is a graph showing the relationship between the differential load and the roll gap difference correction amount between the working side and the driving side for which the wedge plate after rolling is set to 0 under the conditions shown in table 1 in example 1.

First, the inventors found the relationship between differential load (working side-driving side) (kN) and working side and driving side work roll gap difference (driving side pressing: positive) (mm) and the relationship between rolled plate wedge (working side plate thickness: positive) (mm) and driving side work roll gap difference (driving side pressing: positive) (mm) after rolling under conditions of plate width 1750mm, plate thickness of entry side 30mm, pressing rate 40%, work roll diameter 835mm×roll length 2180mm, support roll diameter 1550mm×roll length 2160mm, and rolling mill constant (total of working side and driving side) 5880kN/mm, as shown in table 1, where the plate wedge ratio (= (driving side plate thickness-working side plate thickness)/central plate thickness×100) was changed to 0%, 1% (driving side: thick), 2% (driving side: thick). The relationship of differential load to work roll gap difference is shown in fig. 7, and the relationship of rolled plate wedge to work roll gap difference is shown in fig. 8.

[ Table 1 ]

As a result, as shown in fig. 7, the load on the driving side increases and the differential load increases as the work roll gap difference increases, regardless of the plate wedge ratio, but the differential load increases as the plate wedge ratio increases even if the work roll gap difference is the same.

As shown in fig. 8, it is clear that the plate wedge increases as the work roll gap difference increases, regardless of the plate wedge ratio, so that the plate thickness on the work side increases. It is also known that in order to set the plate wedge to 0 after rolling, the work roll gap difference may be set to 0mm when the plate wedge ratio is 0%, the work roll gap difference may be set to about 0.9mm when the plate wedge ratio is 1%, and the work roll gap difference may be set to about 1.7 to 1.8mm when the plate wedge ratio is 2%.

Next, the inventors found that the deformation resistance ratio (= (driving side deformation resistance-working side deformation resistance)/central deformation resistance+1.0) was changed to 1.0, 1.3 (driving side: large), and 1.5 (driving side: large) by assuming that there was a temperature difference in the sheet width direction under the conditions shown in table 1, the relationship of the differential load (working side-driving side) (kN) with respect to the working side and driving side work roll gap difference (driving side pressing-down: positive) (mm), and the relationship of the rolled sheet wedge (working side sheet thickness pressing-down: positive) (mm) with respect to the working side and driving side work roll gap difference (driving side pressing-down: positive) (mm) were obtained. The relationship of differential load to work roll gap difference is shown in fig. 9, and the relationship of rolled plate wedge to work roll gap difference is shown in fig. 10.

As a result, as shown in fig. 9, as in the case of changing the wedge ratio, the load on the driving side increases and the differential load increases as the work roll gap difference increases, and as the deformation resistance ratio increases, the differential load increases even if the work roll gap difference is the same.

As shown in fig. 10, it is clear that the plate thickness on the working side increases as the work roll gap difference increases, regardless of the deformation resistance ratio. It is also known that in order to set the wedge after rolling to 0, the work roll gap difference may be set to 0mm when the deformation resistance ratio is 1.0, the work roll gap difference may be set to about 0.5mm when the deformation resistance ratio is 1.3, and the work roll gap difference may be set to about 0.9 to 1.0mm when the deformation resistance ratio is 1.5.

The relationships of fig. 7 to 10 are assembled into a relationship. Fig. 11 shows a relationship between a work-side and drive-side work roll gap difference correction amount (drive-side pressing: positive) (mm) with respect to a differential load detection value (work-side-drive-side) (kN) of a rolling front wedge and a widthwise temperature difference (deformation resistance difference).

As a result, as shown in fig. 11, the following relationship is known: the correction amount of the work roll gap difference can be obtained for the differential load detection value, regardless of whether or not the rolling front wedge and the widthwise temperature difference (deformation resistance difference) are different.

Therefore, in the rolling mill for locally deforming the structure shown in fig. 6, the following control experiments were actually performed under the conditions shown in table 2: after the start of the rolling control, a wedge is calculated from the differential load measurement value, and a work roll gap difference correction amount is outputted so that the calculated wedge becomes a target value. The results are shown in fig. 12 to 15.

[ Table 2 ]

Fig. 12 is a graph showing the control results of the wedges in the test machine under the conditions shown in table 2, and is a graph showing the relationship between the actual measurement value (driving side-working side) (kN) of the differential load and the rolling distance (mm) from the start of the control, fig. 13 is a graph showing the relationship between the actual measurement value (driving side depression: positive) (mm) of the working side and the driving side work roll gap correction amount and the rolling distance (mm) from the start of the control, and fig. 14 is a graph showing the actual measurement value and the target value of the wedges (driving side plate thickness increase: positive) (mm) after the rolling and the rolling distance (mm) from the start of the control. FIG. 15 is a graph showing the relationship between the actual measurement value of the rolled wedge (thickness of the drive side: positive) (mm) and the calculated value of the rolled wedge (thickness of the drive side: positive) (mm) in the test machine.

The actual measurement value of the differential load shown in fig. 12 was used to calculate the calculated value of the wedge after rolling by the method shown in fig. 5, and the work roll gap difference correction amount was outputted to roll with the work roll gap correction amount shown in fig. 13, as a result, the target value and the actual measurement value of the wedge were aligned at a high level 500mm after the start of the control as shown in fig. 14.

Further, as a result of evaluating the relationship between the actual measurement value shown in fig. 14 and the result of calculating the calculated value of the plate wedge after rolling from the actual measurement value of the differential load shown in fig. 12, it was found that the actual measurement value of the plate wedge after rolling and the calculated value of the plate wedge were similar to each other as shown in fig. 15.

As can be seen from the findings of fig. 11 and 15, the following relationship exists: the correction amount for setting the plate wedge to the predetermined amount of the work roll gap difference can be obtained from the differential load detection value, regardless of various parameters such as the plate wedge before rolling and the widthwise temperature difference (deformation resistance difference).

Next, the rolling method of the present embodiment will be described with reference to fig. 16. Fig. 16 is a flowchart illustrating a control flow of the wedge in the present embodiment 1.

The rolling method to be described below is performed by a rolling mill as shown in fig. 1 and 2.

First, as shown in fig. 16, the plate wedge control devices 40, 41 receive input of the operation conditions while receiving the driving side load P measured by the driving side load detector 10D _D And a work side load P detected by the work side load detector 10W _W Is input (step S11).

Next, the wedge arithmetic unit 7 of the wedge control device 40, 41 calculates the driving side load P based on the driving side load P measured in step S11 _D Load on working side P _W The widthwise distribution of the rolling load is calculated (step S12).

Then, the plate wedge calculator 7 calculates the wedge of the rolled rear plate using the width direction distribution of the rolling load calculated in step S12 (step S13). The steps S12 and S13 are plate wedge operation steps.

Next, the work roll gap difference calculator 8 of the plate wedge control devices 40 and 41 calculates a work roll gap difference (work roll gap difference correction amount) between the working side and the driving side based on the rolled plate wedge calculated by the plate wedge calculator 7 in step S13 (step S14). The step S14 is a work roll gap difference calculation step.

Next, the work roll gap difference controllers 9 of the plate wedge control devices 40 and 41 control the work roll gap differences on the work side and the drive side to obtain the work roll gap difference calculated by the work roll gap difference calculator 8 in step S14 (step S15). The step S15 is a work roll gap difference control step.

Next, effects of the present embodiment are described.

The rolling facility according to embodiment 1 of the present invention described above includes: a driving side hydraulic cylinder 11D; a working-side hydraulic cylinder 11W; an upper work roll 21 and a lower work roll 31 of a pair of upper and lower rolls for rolling the rolled material 5 by the downward pressure applied by the driving side hydraulic cylinder 11D and the working side hydraulic cylinder 11W; a driving-side load detector 10D that detects a down force generated based on the driving-side hydraulic cylinder 11D; a work side load detector 10W that detects a down force generated by the work side hydraulic cylinder 11W; a rolling material position setting device for setting the positions in the plate width direction of the rolling material 5 introduced into the pair of upper and lower work rolls 21, 31; and plate wedge control devices 40 and 41 for adjusting the plate wedge of the rolled material 5 after rolling.

The plate wedge control devices 40 and 41 include: a plate wedge calculator 7 for calculating a work side load P based on the work side load P detected by the drive side load detector 10D and the work side load detector 10W _W And a driving side load P _D The plate width direction distribution of the plate load applied to the rolled material 5 is obtained, and the rolled plate wedge is calculated based on the obtained plate width direction distribution of the plate load and the plate width direction position of the rolled material 5 set by the rolled material position setting device; a work roll gap difference calculator 8 for calculating a work roll gap difference between the work side and the drive side of the pair of upper work rolls 21 and lower work rolls 31 for setting the rolled wedge of the rolled wedge calculated by the wedge calculator 7 to a predetermined value; and a work roll gap difference controller 9 that controls the driving side hydraulic cylinder 11D and the working side hydraulic cylinder 11W so as to be the work roll gap difference calculated by the work roll gap difference calculator 8.

Accordingly, since the rolled wedge can be easily calculated without measuring the temperature as in patent document 1, the work roll gap difference correction amount required for setting the rolled wedge to a predetermined amount can be obtained from the loads on the driving side and the working side. That is, according to the present invention, the plate wedge can be controlled to a predetermined amount with a simple structure.

Further, although the case where the rolling wedge is calculated by aligning the center in the plate width direction of the rolled material 5 with the centers in the width direction of the upper work roll 21 and the lower work roll 31 by the entry side guide 2 and the following stand 2 has been described, it is not necessarily required to align the center in the plate width direction of the rolled material 5 with the centers in the width direction of the upper work roll 21 and the lower work roll 31, and when the center in the plate width direction of the rolled material 5 does not align with the centers in the width direction of the upper work roll 21 and the lower work roll 31, the rolling wedge (plate meandering amount Y) can be calculated by the consideration of the formulas (9) to (18) to be described in the embodiment 6 to be described later _c Not equal to 0, considered as a fixed value).

Example 2 >

The rolling facility and the rolling method according to embodiment 2 of the present invention will be described with reference to fig. 17 to 21. The same reference numerals are given to the same structures as those of embodiment 1, and the description thereof is omitted. The same applies to the following examples.

Fig. 17 is a plan view showing the structure of the plate wedge control device in this embodiment 2, and fig. 18 is a side view showing the structure of the plate wedge control device in this embodiment 2. Fig. 19 is a diagram showing a configuration for calculating rolling mill constants on the working side and the driving side of the rolling mill in example 2. Fig. 20 is a diagram showing a rolling mill constant calculation method in example 2. Fig. 21 is a flowchart illustrating a control flow of the wedge in the present embodiment 2.

As shown in fig. 17 and 18, in the present embodiment, the displacement of the driving side hydraulic cylinder 11D is measured by a displacement meter in advance before rolling, and the displacement of the working side hydraulic cylinder 11W is measured by a displacement meter.

In addition, in the plate wedge calculator 7A provided in place of the plate wedge calculator 7 of example 1, rolling mill constants of the working side and the driving side are obtained based on the measured displacement amounts of the driving side hydraulic cylinder 11D and the working side hydraulic cylinder 11W, and a rolled plate wedge is calculated using a difference between the rolling mill constants of the working side and the driving side.

If the rolling mill constants on the working side and the driving side are different, when the rolling load changes, the work roll gap difference correction amount changes due to the influence of the change. Accordingly, it is desirable to calculate the rolling wedge by measuring the cylinder displacement and the load of each of the working side hydraulic cylinder and the driving side hydraulic cylinder as described above, calculating the rolling mill constants of the working side and the driving side from the slopes thereof, and combining the difference in the elastic constants of the working side and the driving side for supporting the upper support roll 22 and the difference in the elastic constants of the working side and the driving side for supporting the lower support roll 32.

The method for calculating the rolling mill constants will be described below with reference to fig. 19 and 20.

As shown in fig. 19, the elastic constants of the working side and the driving side for supporting the upper backup roll 22 are K _tw 、K _td The elastic constants of the working side and the driving side for supporting the lower support roll 32 are respectively set to K _bw 、K _bd 。

On the premise of this, first, in a state where the upper work roll 21 and the lower work roll 31 are in roll engagement (roll kiss), the relationship between the displacement amounts of the cylinders measured in the working side hydraulic cylinder 11W and the driving side hydraulic cylinder 11D and the loads measured by the working side load detector 10W and the driving side load detector 10D is collated, and the rolling mill constants K on the working side and the driving side are calculated from the slopes thereof as shown in fig. 20.

Then, regarding the rolling mill constants K on the working side and the driving side which are obtained respectively, the upper and lower backup roll supporting elasticity, the upper and lower backup roll rigidity, and the upper and lower work roll rigidity are set as tandem elasticity, and the working side and the driving side elastic constants K which are unknowns are obtained in consideration of the ratio of the upper and lower elastic constants _tw 、K _td 、K _bw 、K _bd The ratio of the elastic constants is obtained by taking into consideration other analyses of the frame and the like. In this case, the elastic constant is closely considered to be due to the bending deformation of the axial center of the work roll and the deflection from the work roll to the stand The axial deflection deformation of the backup roll due to the load of the backup roll, the deformation due to the contact load between the upper and lower work rolls, the flat deformation between the work roll and the backup roll, and the like.

Other structures and operations are substantially the same as those of the rolling facility and the rolling method of the above-described embodiment 1, and details thereof are omitted.

Next, the rolling method of the present embodiment will be described with reference to fig. 21.

First, as shown in fig. 21, the plate wedge control devices 40 and 41 receive input of the displacement amount of the driving side hydraulic cylinder 11D and the displacement amount of the working side hydraulic cylinder 11W measured by the displacement meter before rolling (step S21).

Next, the plate wedge arithmetic unit 7A of the plate wedge control devices 40 and 41 obtains the work side and drive side rolling mill constants by using the displacement amount of the drive side hydraulic cylinder 11D and the displacement amount of the work side hydraulic cylinder 11W measured in step S21, determines the ratio of the upper and lower elastic constants, and calculates the elastic constants K for the work side and drive side based on the obtained rolling mill constants _tw 、K _td 、K _bw 、K _bd An operation is performed (step S22).

In addition, as shown in fig. 21, at the time of rolling, the plate wedge control devices 40, 41 receive input of the operation conditions and simultaneously receive the driving side load P measured by the driving side load detector 10D _D And a work side load P detected by the work side load detector 10W _W Is input (step S23).

Next, the driving side load P measured in step S23 is used by the wedge arithmetic unit 7A of the wedge control device 40, 41 _D Load on working side P _W The widthwise distribution of the rolling load is calculated (step S24).

Then, the plate wedge calculator 7A uses the width direction distribution of the rolling load calculated in step S24 and the elastic constant K calculated in step S22 _tw 、K _td 、K _bw 、K _bd The rolling back plate wedge is calculated (step S25).

Next, the work roll gap difference calculator 8 of the plate wedge control devices 40 and 41 calculates the work roll gap difference between the working side and the driving side based on the rolled plate wedge calculated by the plate wedge calculator 7A in step S25 (step S26).

Next, the work roll gap difference controllers 9 of the plate wedge control devices 40 and 41 control the work roll gap differences on the work side and the drive side to obtain the work roll gap difference calculated by the work roll gap difference calculator 8 in step S26 (step S27).

The rolling facility and rolling method according to embodiment 2 of the present invention can also obtain substantially the same effects as those of the rolling facility and rolling method according to embodiment 1 described above.

The plate wedge calculator 7A calculates rolling constants of the working side and the driving side based on the displacement amounts of the driving side hydraulic cylinder 11D and the working side hydraulic cylinder 11W measured by the displacement meter that detects the displacement amounts of the driving side hydraulic cylinder 11D and the working side hydraulic cylinder 11W, and calculates a rolled plate wedge using a difference between the rolling constants of the working side and the driving side. If the rigidity of the working side and the driving side are different, there is a disadvantage that the plate wedge is generated due to the influence of the change in the rolling load, but as in the present embodiment, the influence of the rigidity when the plate wedge is calculated can be eliminated by obtaining the rigidity of the working side and the driving side in advance, and the rolled plate wedge can be controlled to a predetermined amount with higher accuracy.

Example 3 >

A rolling apparatus and a rolling method according to embodiment 3 of the present invention will be described with reference to fig. 22 to 24.

Fig. 22 is a plan view showing the structure of the plate wedge control device in this embodiment 3, and fig. 23 is a side view showing the structure of the plate wedge control device in this embodiment 3. Fig. 24 is a flowchart illustrating a control flow of the wedge in embodiment 3.

As shown in fig. 22 and 23, in the present embodiment, the detection values of the driving side load detector 10D and the working side load detector 10W are filtered by the filter arithmetic unit 12, and the filtered detection values are input to the plate wedge arithmetic unit 7B.

The filter operator 12 is, for example, a first-order lag filter.

The plate wedge calculator 7B obtains a plate width direction distribution of the plate load applied to the rolled material 5 using the filtered detection value, and calculates a rolled plate wedge based on the obtained plate width direction distribution of the plate load and the plate width direction position of the rolled material 5 set by the rolled material position setting device.

Next, the rolling method of the present embodiment will be described with reference to fig. 24.

First, as shown in fig. 24, the plate wedge control device 40, 41 receives an input of an operation condition, and receives a driving side load P measured by the driving side load detector 10D _D And a work side load P detected by the work side load detector 10W _W Is input (step S31).

Next, the filter arithmetic unit 12 of the board wedge control device 40, 41 calculates the driving side load P measured in step S31 _D Load on working side P _W Filtering is performed (step S32).

Next, the plate wedge arithmetic unit 7B of the plate wedge control device 40, 41 calculates the driving side load P filtered in step S32 _D Load on working side P _W The widthwise distribution of the rolling load is calculated (step S33).

Then, the plate wedge calculator 7B calculates the wedge of the rolled rear plate using the width direction distribution of the rolling load calculated in step S33 (step S34).

Next, the work roll gap difference arithmetic unit 8 of the plate wedge control devices 40 and 41 calculates the roll gap difference between the working side and the driving side based on the rolled plate wedge calculated by the plate wedge arithmetic unit 7B in step S34 (step S35).

Next, the work roll gap difference controllers 9 of the plate wedge control devices 40 and 41 control the roll gap differences on the work side and the drive side to obtain the roll gap difference calculated by the work roll gap difference calculator 8 in step S35 (step S36).

The rolling facility and rolling method according to embodiment 3 of the present invention can also obtain substantially the same effects as those of the rolling facility and rolling method according to embodiment 1 described above.

In addition, when the wedge control is not performed with high response, as in the present embodiment, by further providing the filter arithmetic unit 12 for filtering the detection values of the driving side load detector 10D and the working side load detector 10W, the detection values can be made stable (noise is removed), and thus, abrupt changes in the work roll gap difference operation amount can be prevented, and stable wedge control can be realized.

In addition, although the case where the filter arithmetic unit 12 is a first-order lag filter has been described, the filter arithmetic unit is not limited to this, and arithmetic units having various filter functions can be used.

In this embodiment, the rolling wedge can be calculated using the difference between the rolling mill constants on the working side and the driving side as in example 2.

Example 4 >

A rolling apparatus and a rolling method according to embodiment 4 of the present invention will be described with reference to fig. 25 to 28.

Fig. 25 is a plan view showing the structure of the plate wedge control device in this embodiment 4, and fig. 26 is a side view showing the structure of the plate wedge control device in this embodiment 4. Fig. 27 is a block diagram of a plate wedge control device in this embodiment 4. Fig. 28 is a flowchart illustrating a control flow of the wedge in embodiment 4.

As shown in fig. 25 and 26, the plate wedge control device of the present embodiment further includes a target plate wedge Δh and a post-rolling plate wedge calculation value Δh calculated by the plate wedge calculator 7 _ref And a dead zone calculator 13 for reducing the absolute value of the difference when the difference is equal to or smaller than a predetermined value. The dead zone arithmetic unit 13 is provided in the work roll gap difference arithmetic unit 8C.

In example 1 and the like, there are the following drawbacks: in the case of a small error in which the plate wedge deviation is equal to or smaller than the allowable value, since the error is controlled to be a predetermined value, the error is accumulated and the work roll gap difference correction amount is continuously increased. Therefore, as shown in fig. 27, the predetermined wedge target value Δh is set _ref Difference from the calculated value Δh of the wedgeWhen the difference is equal to or smaller than the predetermined value, the difference is passed through a dead zone calculator 13 having a dead zone (dead zone) function for outputting 0 as the difference. Thus, it is desirable to realize that the work roll gap difference is not corrected if the difference is extremely small.

Next, the rolling method of the present embodiment will be described with reference to fig. 28.

First, as shown in fig. 28, the plate wedge control devices 40, 41 receive input of the operation condition, and receive the driving side load P measured by the driving side load detector 10D _D And a work side load P detected by the work side load detector 10W _W Is input (step S41).

Next, the wedge arithmetic unit 7 of the wedge control device 40, 41 calculates the driving side load P based on the driving side load P measured in step S41 _D Load on working side P _W The widthwise distribution of the rolling load is calculated (step S42).

Then, the plate wedge calculator 7 calculates the wedge of the rolled rear plate using the width direction distribution of the rolling load calculated in step S42 (step S43).

Next, the dead zone calculator 13 in the work roll gap difference calculator 8C of the plate wedge control devices 40, 41 calculates the calculated value Δh of the rolled plate wedge and the plate wedge target value Δh calculated by the plate wedge calculator 7 in step S13 _ref The difference between them is subjected to dead zone operation (step S44).

Next, the work roll gap difference calculator 8C of the plate wedge control devices 40 and 41 calculates the work roll gap difference between the working side and the driving side based on the rolled plate wedge obtained from the dead zone calculation result in step S44 (step S45).

Next, the work roll gap difference controllers 9 of the plate wedge control devices 40 and 41 control the work roll gap differences on the work side and the drive side to obtain the work roll gap difference calculated by the work roll gap difference calculator 8C in step S14 (step S46).

The rolling facility and rolling method according to embodiment 4 of the present invention can also obtain substantially the same effects as those of the rolling facility and rolling method according to embodiment 1.

Further, the rolling wedge calculator 7 is provided with a calculated value Δh of the rolled wedge and a target wedge Δh _ref The dead zone calculator 13, which reduces the absolute value of the difference when the difference between the two is equal to or smaller than a predetermined value, can correct the work roll gap difference so as to prevent the cumulative error with respect to a small error in which the plate wedge deviation is equal to or smaller than the allowable value, and can control the rolled plate wedge to a more stable value.

The dead zone calculator 13 is not limited to the one that outputs 0 as a difference value when the difference value between the calculated value of the rolled wedge and the target wedge calculated by the wedge calculator 7 is equal to or smaller than a predetermined value, and may be one that multiplies the difference value by a predetermined coefficient having an absolute value smaller than 1 to reduce the difference value.

The dead zone arithmetic unit is not limited to an arithmetic unit that reduces the absolute value of the difference when the difference between the calculated value of the rolled wedge and the target wedge calculated by the wedge arithmetic unit 7 is equal to or smaller than a predetermined value, and may be an arithmetic unit that reduces the absolute value of the gap difference outputted by the gap difference arithmetic unit when the absolute value of the difference between the roll gap difference calculated by the gap difference arithmetic unit and the current roll gap difference is equal to or smaller than a predetermined value, or an arithmetic unit that reduces the absolute value of the control value when the control value of the roll gap difference between the working side and the driving side outputted by the gap difference controller is equal to or smaller than a predetermined value.

In this embodiment, the rolling wedge can be calculated by using the difference between the rolling mill constants of the work side support portion and the drive side support portion as in embodiment 2, and the filtering can be performed as in embodiment 3, separately or simultaneously.

Example 5 >

The rolling facility and rolling method according to example 5 of the present invention will be described with reference to fig. 29.

Fig. 29 is a plan view showing a configuration of side guide positioning control in the board wedge control device in this embodiment 5.

As shown in fig. 29, the plate wedge control device of the present embodiment further includes a position controller 20, and the position controller 20 receives an input of the oil column position of the hydraulic cylinder 6 for positioning the plate width direction position of the entry side guide 2 during rolling of the rolling material 5, and controls the oil column position of the hydraulic cylinder 6 so that the plate width direction position of the entry side guide 2 is maintained at a predetermined position, instead of performing constant pressure control on the entry side guide 2.

The rolling facility and rolling method according to embodiment 5 of the present invention can also obtain substantially the same effects as those of the rolling facility and rolling method according to embodiment 1.

Further, by further providing the position controller 20 for controlling the position of the side guides in the sheet width direction to a predetermined position, the side guides can be positioned and controlled. Therefore, compared to example 1 in which the constant pressure control is performed on the side guides, the eccentricity of the center of the rolled material 5 passing through the rolling mill in the width direction and the occurrence of the bending phenomenon, that is, the warping of the rolled material 5 can be more reliably suppressed.

In this embodiment, the difference between the rolling constants of the work side support portion and the drive side support portion can be used to calculate the rolling wedge, filter the rolling wedge, and calculate the dead zone, as in embodiment 3, and embodiment 4, as in embodiment 2, separately or simultaneously.

Example 6 >

A rolling apparatus and a rolling method according to embodiment 6 of the present invention will be described with reference to fig. 30 to 34.

Fig. 30 is a plan view showing the structure of a control plate wedge in the plate wedge control device in example 6, and fig. 31 is a side view showing the structure of the plate wedge control device. Fig. 32 is a diagram illustrating a width direction distribution of a rolling load and a calculation method of a rolled wedge in the wedge control device in example 6. Fig. 33 is a flowchart illustrating a control flow of the wedge in embodiment 6. Fig. 34 is a plan view showing a configuration for controlling the plate width direction of a rolled material, which is a modification of the plate wedge control device in embodiment 6.

As shown in fig. 30 and 31, the rolling mill according to the present embodiment is not provided with a side guide on the entry side of the rolling mill, and instead, is provided with a center line shift detection device 14 provided on the exit side of the horizontal rolling mill 1 for detecting the position of the rolled material 5 in the plate width direction.

In the present embodiment, the rolling material position setting device is the center line deviation detecting device 14. The center line shift detection device 14 is not limited to being provided on the exit side of the upper work roll 21 and the lower work roll 31, and may be provided on the entry side only, or on the entry side and the exit side.

The center line shift detection device 14 is constituted by, for example, a CCD camera and a processing system for processing the captured image, and detects the position of the rolled material 5 in the sheet width direction by detecting the end portion of the rolled material 5 from the captured image of the CCD camera by various known processing methods, but the present invention is not limited to this, and it is needless to say that the position of the rolled material 5 in the sheet width direction can be detected.

The wedge calculator 7E also calculates a wedge after rolling using the detected value of the position in the plate width direction of the rolled material 5 detected by the center line shift detector 14.

Next, a description will be given of a width direction distribution of a rolling load and a calculation method of a rolled wedge in the wedge calculator 7E in the present embodiment, which are not limited to the center line (center of equipment) +..

First, the plate wedge operator 7E receives the driving side load P of the driving side supporting portion from the driving side load detector 10D _D And receives the work side load P of the work side support portion from the work side load detector 10W _W According to the input of the driving side load P _D Load on working side P _W The plate width direction distribution of the plate load applied to the rolled material 5 as shown in fig. 32 was obtained.

Here, the force balance in the up-down direction in the rolled material 5 has a relationship of the following expression (9).

[ formula 9 ]

Equation (9) is the same as equation (1), and P _D Is the driving side load detection value (kN), P _W Is the work side load detection value (kN), W is the plate width (mm), p of the rolled material 5 _d Is the rolling load per unit width (kN/mm), p, at the end of the drive side plate _w Is the rolling load per unit width (kN/mm) at the end of the working side plate.

In addition, in fig. 32, the torque balance at the center in the width direction of the rolling mill, i.e., the point a, has the relationship of the following expression (10).

[ arithmetical formula 10 ]

/>

In the expression (10), p (x) is a rolling load plate width direction distribution (kN/mm) per unit width, L is a working side to driving side cylinder distance (mm), and Y _c Is the amount of plate meandering (mm), and x is the plate width direction position (mm) of the rolled material 5.

Here, the rolling load equation (linear distribution) per unit width of the rolled material 5 is a relationship of the following equation (11), and the limit range of x is a relationship of the following equation (12).

[ formula 11 ]

[ formula 12 ]

Based on the expression (10) calculated by substituting the relation between the expression (11) and the expression (12) and the expression (9), the rolling load p per unit width at the end of the driving side plate is calculated _d The following expression can be used(13) That means that the rolling load p per unit width at the end of the working side plate _w Can be expressed as the following expression (14). C, D in the formulas (13) and (14) are defined by the formulas (17) and (18), respectively, and A, B in the formulas (17) and (18) are defined by the formulas (15) and (16), respectively.

[ formula 13 ]

[ formula 14 ]

[ formula 15 ]

[ arithmetical [ 16 ]

[ arithmetical 17 ]

[ arithmetical 18 ]

From the formulas (13) and (14), the plate width direction distribution of the plate load can be obtained.

Next, the plate wedge calculator 7E applies the plate width direction distribution of the obtained plate load, analyzes the elastic deformation of the roll portion, and calculates the plate wedge after rolling. The calculation method of the rolled plate wedge is the same as in example 1.

Next, the rolling method of the present embodiment will be described with reference to fig. 33.

First, as shown in fig. 33, the plate wedge control device 40, 41 receives an input of an operation condition, and receives a driving side load P measured by the driving side load detector 10D _D And a work side load P detected by the work side load detector 10W _W Is input to the computer. Then, the position of the rolled material 5 in the sheet width direction is detected by the center line shift detection device 14 (step S51).

Next, the wedge arithmetic unit 7E of the wedge control device 40, 41 calculates the driving side load P based on the driving side load P measured in step S51 _D Load on working side P _W And the position in the plate width direction of the rolled material 5, and calculates the width direction distribution of the rolling load (step S52).

Then, the plate wedge calculator 7E calculates the rolled rear plate wedge using the width direction distribution of the rolling load calculated in step S52 (step S53).

Next, the work roll gap difference arithmetic unit 8 of the plate wedge control devices 40 and 41 calculates the roll gap difference between the working side and the driving side based on the rolled plate wedge calculated by the plate wedge arithmetic unit 7E in step S53 (step S54).

Next, the work roll gap difference controllers 9 of the plate wedge control devices 40 and 41 control the roll gap differences on the work side and the drive side to obtain the roll gap difference calculated by the work roll gap difference calculator 8 in step S54 (step S55).

In the rolling facility and the rolling method according to embodiment 6 of the present invention, the center line shift detection device 14 for detecting the position of the rolled material 5 in the plate width direction is provided as the rolled material position setting device at least on the entry side or the exit side of the upper work roll 21 and the lower work roll 31, and the plate wedge calculator 7E calculates the rolling rear plate wedge by using the detected value of the position of the rolled material 5 in the plate width direction detected by the center line shift detection device 14, and in such a rolling facility and rolling method, substantially the same effects as those of the rolling facility and rolling method according to embodiment 1 can be obtained.

In addition, in the present embodiment, since the side guides are not necessary any more, the structure of the apparatus can be simplified, and thus low cost can be achieved.

In the present embodiment, the case where the side guides are not used has been described, but in the present embodiment, the rolling rear plate wedge can be calculated by detecting the plate width direction position by the center line deviation detecting device 14, while reducing the meandering of the rolled material 5 by providing the side guides 2 as shown in fig. 34. Alternatively, the side guides may be provided on either the entrance side or the exit side. In such a configuration, when the plate cannot be wound around 0 by the side guides, for example, when a gap is present between the side guides and the rolled material 5, a large effect can be obtained.

In this embodiment, the difference between the rolling constants of the work side support portion and the drive side support portion can be used to calculate the rolling wedge, filter the rolling wedge as in embodiment 3, and calculate the dead zone as in embodiment 4. In addition, in the case of using the side guides, the positioning control of the side guides can be performed as in embodiment 5, and in this case, embodiments 2 to 4 can be implemented in an appropriate combination.

< others >

The present invention is not limited to the above-described embodiments, and includes various modifications. The above-described embodiments are described in detail for the purpose of easily understanding the present invention, but are not necessarily limited to having all the structures described. In addition, a part of the structure of one embodiment may be replaced with the structure of another embodiment, and the structure of another embodiment may be added to the structure of one embodiment. In addition, deletion, and substitution of other structures may be performed for a part of the structures of the respective embodiments.

Description of the reference numerals

1 … hydraulic cylinder

2 … Inlet side guide

3 … out-side guide

5 … rolled material

6. 6A, 6B … hydraulic cylinder

7. 7A, 7B, 7E … plate wedge arithmetic unit

8. 8C … working roll gap difference arithmetic unit

9 … work roll gap difference controller

10D … driving side load detector

10W … operation side load detector

11D … driving side hydraulic cylinder

11W … operation side hydraulic cylinder

12 … filter arithmetic unit

13 … dead zone arithmetic unit

14 … central line deviation detecting device

20 … position controller

21 … upper working roll

22 … upper backup roll

31 … lower working roll

32 … lower back-up roll

40. 41 … plate wedge control.

Claims

1. A rolling mill is provided with:

a driving side hydraulic cylinder;

a working-side hydraulic cylinder;

a pair of upper and lower work rolls for rolling a rolling material by using a downward pressure applied by the driving side hydraulic cylinder and the working side hydraulic cylinder;

a driving-side load detector that detects a down force generated based on the driving-side hydraulic cylinder;

a work side load detector that detects a down force generated based on the work side hydraulic cylinder;

a rolling material position setting device for setting a plate width direction position of the rolling material introduced into the pair of upper and lower work rolls; and

a plate wedge control device for adjusting the plate wedge of the rolled material after rolling,

The rolling plant is characterized in that,

the plate wedge control device comprises:

a plate wedge calculator that obtains a plate width direction distribution of a plate load applied to the rolled material from the load of the work side support portion and the load of the drive side support portion of the work roll detected by the drive side load detector and the work side load detector, and calculates a rolled plate wedge based on the obtained plate width direction distribution of the plate load and the plate width direction position of the rolled material set by the rolled material position setting device;

a gap difference calculator for calculating a work roll gap difference between a work side and a drive side of the pair of upper and lower work rolls for setting the rolled plate wedge calculated by the plate wedge calculator to a predetermined value; and

a gap difference controller that controls the drive side hydraulic cylinder and the work side hydraulic cylinder so as to be the work roll gap difference calculated by the gap difference calculator,

the rolled material position setting means is a side guide provided on the entry side of the work roll or provided on the entry side and the exit side of the work roll, and a center line shift detection means provided at least on the entry side or the exit side of the work roll for detecting a plate width direction position of the rolled material,

The plate wedge arithmetic unit obtains rolling mill constants of a working side and a driving side based on the displacement amounts of the driving side hydraulic cylinder and the working side hydraulic cylinder measured by a displacement meter that detects the displacement amounts of the driving side hydraulic cylinder and the working side hydraulic cylinder, and calculates the rolled plate wedge by using a difference between the rolling mill constants of the working side and the driving side,

the plate wedge calculator calculates the rolled plate wedge using the detection value of the plate width direction position of the rolled material detected by the center line shift detection device,

the rolling device further comprises a dead zone calculator for reducing the absolute value of the difference between the rolled plate wedge and the target plate wedge calculated by the plate wedge calculator when the difference is equal to or less than a predetermined value.

2. The rolling apparatus according to claim 1, wherein the rolling apparatus comprises a rolling mill,

the apparatus further includes a filter arithmetic unit that filters a detection value of the drive-side load detector and the work-side load detector.

3. The rolling apparatus according to claim 1, wherein the rolling apparatus comprises a rolling mill,

the device further comprises a position controller for controlling the plate width direction position of the side guide to a predetermined position.

4. A rolling method for rolling a material using a rolling mill provided with: a driving side hydraulic cylinder; a working-side hydraulic cylinder; a pair of upper and lower work rolls for rolling a rolling material by using a downward pressure applied by the driving side hydraulic cylinder and the working side hydraulic cylinder; a driving-side load detector that detects a down force generated based on the driving-side hydraulic cylinder; a work side load detector that detects a down force generated based on the work side hydraulic cylinder; a rolling material position setting device for setting a plate width direction position of the rolling material introduced into the pair of upper and lower work rolls; and a plate wedge control device for adjusting the plate wedge of the rolled material after rolling, wherein the rolling method is characterized by comprising the following steps:

(a) A step of calculating a plate width direction distribution of a plate load applied to the rolled material based on the load of the work side support section and the load of the work side support section detected by the drive side load detector and the work side load detector, and calculating a rolled wedge based on the calculated plate width direction distribution of the plate load and the plate width direction position of the rolled material set by the rolled material position setting device;

(b) A step of calculating a work roll gap difference between a work side and a drive side of the pair of upper and lower work rolls for bringing the rolled plate wedge calculated in the step (a) to a predetermined value; and

(c) A step of controlling the driving side hydraulic cylinder and the working side hydraulic cylinder so that the working roll gap difference calculated in the step (b) becomes,

In the step (a), rolling mill constants of the working side and the driving side are obtained based on the displacement amounts of the driving side hydraulic cylinder and the working side hydraulic cylinder measured by a displacement meter that detects the displacement amounts of the driving side hydraulic cylinder and the working side hydraulic cylinder, and the rolled wedge is calculated using a difference between the rolling mill constants of the working side and the driving side,

in the step (a), the rolled rear plate wedge is also calculated by using the detected value of the plate width direction position of the rolled material detected by the center line deviation detecting device,

and (e) reducing the absolute value of the difference between the rolled wedge and the target wedge calculated in the wedge calculation step when the difference is equal to or less than a predetermined value.

5. A rolling method according to claim 4, wherein,

and (d) filtering detection values of the driving side load detector and the working side load detector.

6. A rolling method according to claim 4, wherein,

and (f) controlling the position of the side guide in the widthwise direction to a predetermined position.