JP2005118841A - Plate shape control method and plate rolling mill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plate shape control method by a split backup roll type plate rolling mill by which the dimensions and the shape of a plate is controlled in high accuracy and stable rolling operation is realized. <P>SOLUTION: In the plate shape control method, the plate shape when a plate is rolled is estimated in a split backup roll type plate rolling mill 8 based on the loads and the positions of reduction of split backup rolls 21-27, and 51-57 measured when the plate is rolled, and a plate shape controller is controlled so as to obtain the target plate shape based on the result of the estimation. The positions of both edges in the width direction of a work S to be rolled under the rolling are measured or estimated, and the positions of reduction of the split backup rolls 21-27, and 51-57 are controlled based on the measured values or the estimated values. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a plate shape control method in a rolling mill, in particular, a split backup roll type plate rolling in which at least one of the upper and lower roll assemblies has a mechanism for supporting a work roll by a divided backup roll divided into three or more in the axial direction. The present invention relates to a plate shape control method using a mill and a plate rolling machine.

  Recently, there has been a split backup roll type plate rolling mill that can measure the load distribution of the split backup roll and estimate the load distribution between the rolled material and the work roll. It is attracting attention (see, for example, Patent Document 1).

Moreover, in the said plate rolling machine, the method of controlling a plate shape with high precision is proposed. In this plate shape control method, the width direction plate thickness plate distribution and shape so that the width direction load distribution between the rolled material and the work roll estimated from the measured load of each divided backup roll in the plate rolling machine becomes a desired value. A control apparatus is controlled (for example, refer patent document 2).
Japanese Patent Laid-Open No. 5-69010 (page 3, FIGS. 1 and 3) JP-A-6-262228 (2nd page, 3rd page, FIG. 1 and FIG. 2)

  In the case of plate rolling, the rolled material before rolling undergoes width variation and camber (lateral bending) in the longitudinal direction, and the edge positions on both sides of the rolled material change greatly during rolling. As a result, the positional relationship between the edge of the rolled material and the edge of the divided backup roll located immediately above (or directly below) the rolled material edge, for example, the effective rolling reduction width of the divided backup rolls 21 and 27 shown in FIG. Horizontal distances (δw, δd) between both edges and the edges of the divided backup rolls 21, 27 are constantly changing. In such a case, the loads of the divided backup rolls 21 and 27 are significantly affected by the effective rolling reduction widths δw and δd. For this reason, in the conventional plate shape control method, there are not a few errors in estimating the rolling load distribution and determining the target load value, and the desired dimensions and shape cannot be obtained. There was a risk of failure.

  An object of the present invention is to eliminate the above-mentioned problems, and to provide a plate shape control method and a plate rolling machine using a split backup roll type plate rolling machine capable of achieving high-precision size and shape control and stabilization of rolling operation. Is to provide.

  The plate shape control method of the present invention has a mechanism for supporting the upper and lower work rolls by a divided backup roll in which at least one of the upper and lower roll assemblies is divided into three or more parts in the axial direction. Each backup roll is equipped with an independent load measuring device and a plate rolling machine equipped with a plate shape control device, and the plate shape at the time of plate rolling is determined based on the load and rolling position of each divided backup roll measured at the time of plate rolling. In the plate shape control method for controlling the plate shape control device so as to obtain a target shape based on the estimation result, the width direction both edge positions of the rolled material being rolled are measured or estimated, and this measured value or estimated It is characterized by controlling the reduction position of each divided backup roll based on the value.

  The plate rolling machine of the present invention is a rolling mill for carrying out the above plate shape control method, and measures both the plate edge measuring device or the plate width measuring device and the plate for measuring the positions of the plate edges in the plate width direction. A plate piece edge measuring device for measuring the position of one edge in the plate width direction is provided on at least one of the entrance side and the exit side of the rolling mill.

  In the present invention, since the rolling position of each divided backup roll is controlled based on the measured value or estimated value of the width direction both edge positions of the rolled material, high-precision dimension and shape control and stabilization of the rolling operation can be achieved. .

  1 and 2 show an embodiment of the present invention. FIG. 1 is a side view of a plate rolling machine for carrying out a plate shape control method, and FIG. 2 shows an arrangement of upper work rolls and divided backup rolls. It is a top view.

  In the plate rolling machine 8, a main reduction device 17 and a main load measuring device 18 are provided in the housing 9. An upper inner housing 15 and a lower inner housing 45 are provided in the housing 9. The upper inner housing 15 is disposed so as to be movable up and down by a main pressure reducing device 17.

  An upper roll assembly 10 is provided in the upper inner housing 15. The upper roll assembly 10 is provided with divided backup rolls 21 to 27 and supports the upper work roll 13. In addition, independent load measuring devices 321 to 327 are provided for the respective divided backup rolls 21 to 27. In the figure, reference numerals 301 to 307 are examples of a reduction device arranged independently on each of the divided backup rolls 21 to 27. As shown in FIG. 2, three entrance-side split backup rolls 22, 24, 26 and four exit-side split backup rolls 21, 23, 25, 27 are alternately arranged in the roll axis direction.

  Similarly, a lower roll assembly 40 is provided in the lower inner housing 45 to support the lower work roll 43. The lower roll assembly 40 includes divided backup rolls 51 to 57, reduction devices 601 to 607, and load measuring devices 621 to 627. The arrangement of the inlet side divided backup rolls 52, 54, 56 and the outlet side divided backup rolls 51, 53, 55, 57 is the same as that of the upper inner housing 15. The upper divided backup rolls 21 to 27 and the lower divided backup rolls 51 to 57 are vertically symmetric.

  Both edge position measuring devices 70 are arranged on the entrance side of the rolling mill. When the rolling mill includes a sheet width measuring device, a single edge position measuring device may be used. Moreover, you may provide these edge position measuring apparatuses in the rolling mill delivery side.

  The plate rolling machine 8 also has a plate shape control device (none of which is shown in the figure) that uses the reduction pattern control mechanism of the divided backup rolls 21 to 27 and 51 to 57, a work roll bender, or the like as an actuator. Measurement values of the load measuring devices 321 to 327 and 621 to 627 and the edge position measuring device 70 are input to the plate shape control device. Moreover, each division | segmentation backup roll reduction device 301-307, 601-607 operate | moves based on the command from a plate shape control apparatus.

  In addition, the said plate rolling machine 8 equips each division | segmentation backup roll 21-27, 51-57 with the rolling down apparatus 301-307, 601-607 and the load measuring apparatus 321-327, 621-627 on the upper and lower sides. However, it is sufficient that both devices are equipped on either one of the upper and lower sides. The division | segmentation backup roll should just be divided into 3 or more to an axial direction, and may be arrange | positioned so that it may oppose on the entrance side and the exit side. Further, the backup roll on either one of the upper and lower sides may be a non-split backup roll.

In the plate rolling machine 8 configured as described above, the plate shape is controlled as follows.
During rolling, loads acting on the divided backup rolls 21 to 27 and 51 to 57 by the load measuring devices 321 to 327 and 621 to 627 are obtained, and both edge positions in the width direction of the rolled material S are obtained by the both edge position measuring device 70. taking measurement. When both the edge position measuring device 70 and the work rolls 13 and 43 are separated from each other, it is desirable to correct a time difference between the edge position measuring time and the rolling time by using a plate speed or the like. Note that an estimated value may be used instead of the measured value of the edge position of the rolled material S. In this case, the edge position of the rolled material S is estimated from the plate width before rolling, the camber shape, the setting position of the side guide, and the like.

  Based on the measured value or estimated value of both edge positions of the rolled material, the reduction position of each divided backup roll is controlled as follows.

Load the q _i which acts on the i split backup _rolls, a load-rolled material - work roll corresponding to the position and p _i, deformation matrix for K ^W _ij of the work roll axis _deflection, divided backup roll system deformation matrix _Is expressed as K ^B _ij , and the work roll profile expressed in roll crown type is C ^W _i Assuming that the split backup roll profile is C ^B _i and the work roll axis deflection is y ^W _i , Equation (1) is obtained from the matching conditions of the split backup roll and the work roll.
y ^W _i = K ^B _ij q _j + C ^W _i + C ^B _i (1)
In addition, in the mathematical expression of this specification, when there is repetition of the subscript, it is expressed using Einstein's sum rules. K ^B _ij is an influence coefficient matrix representing the displacement of the i-th divided backup roll when a unit load is applied to the j-th divided backup roll. Here, the housing variables and the work rolls to the divided backup rolls are divided. The deformation matrix includes the flat deformation of both rolls due to contact.

On the other hand, the work roll deflection is expressed by Expression (2) using the deformation matrix K ^W _ij and the rolling load distribution p _i acting between the rolled material and the work roll.
_{^{y W i = K W ij (}} p j -q j) (2)

Equation (1), erases the ^y _{W i} from the equation (2), Equation (3) is obtained to determine the a to organize rolling force distribution _{p i.}
p _i = q _i + [K ^W ] ⁻¹ _ij (K ^B _jk q _k + C ^W _j + C ^B _j ) (3)
In the above right side, [K ^W ] ⁻¹ _ij is an inverse matrix of K ^W _ij and is a quantity that can be calculated in advance together with K ^B _jk . Further, since C ^B _j and C ^W _j are also quantities that can be measured or estimated, if the measured value of q _i is obtained by the rolling mill of the present invention, the rolling load distribution between the rolled material and the work rolls can be calculated by the equation (3) p _i can be calculated immediately.

By the way, the rolling load p ^* _i per unit width is generally a function of the entry side plate thickness H, the exit side plate thickness h, the deformation resistance k, the friction coefficient μ, the entry side tension σ ₀ , and the exit side tension σ _1. It is given by (4).
p ^* _i = p ^* (H, h, k, μ, σ ₀ , σ ₁ ) (4)
Among the above factors, the entry side tension and the exit side tension vary greatly depending on the position of the rolled material in the sheet width direction and may have a significant effect on the rolling load distribution. It is known that the following relationship called the tension feedback effect is obtained through the elongation strain difference Δε expressed and the Young's modulus E of the rolled material.

σ ₀ = σ ^* ₀ −EΔε (5)
σ ₁ = σ ^* ₁₋ EΔε (6)
Here, σ ^* ₀ and σ ^* ₁ are average tensions, and only the relative value is extracted so that the elongation strain difference Δε in the equations (5) and (6) becomes zero when integrated in the plate width direction. Yes.

By substituting Equations (5) and (6) into Equation (4), Equation (7) is obtained.
p ^* _i = p ^* (H, h, k, μ, σ ^* ₀ , σ ^* ₁ , Δε) (7)
Since all the factors other than Δε in the right parenthesis in Equation (7) are known or can be estimated, the rolling load p _i is calculated from the divided backup roll load q _i (measured value), and then Equation (7) Can be calculated by calculating the elongation strain difference Δε. At that time, in the divided backup roll (i = w and i = d) located immediately above (or directly below) the rolled material edge, even if the rolling loads p _w and p _d are the same as shown in FIG. Since the rolling loads p ^* _w and p ^* _d per unit width change according to the widths δw and δd, the rolling reduction effective widths δw and δd are calculated from both edge positions of the measured or estimated rolled material, and then the equation (8 ) And (9), p ^* _w and p ^* _d are calculated.
_{^{p * w = p w / δw}} (8)
_{^{p * d = p d / δd}} (9)
Other resolving backup roll (i ≠ w, d) computes calculated by equation (10) using the torso length w _i of each divided backup rolls for.
_{^{p * i = p i / w}} i (10)
If the elongation strain difference Δε, that is, the current plate shape is calculated and calculated, the plate shape control device may be operated to make this a desired plate shape. For example, the elongation strain difference Δε ^opt corresponding to the desired plate shape is substituted into the equation (7) to obtain the rolling load distribution p ^{* opt} _i per unit width, and further the equations (8) to (10 ) calculated back to the advance by calculating the rolling force distribution p ^opt _i corresponding to the desired plate shape, which the pressure of the split backup rolls by the formula (11) in order to eliminate the difference between the current rolling force distribution p _i The operation amount δu _{i of the} position is calculated and calculated, and the plate shape control device is operated based on this.

δu _i = F (δp _i ) (11)
Here, δp _i is the difference between the rolling load distribution p ^opt _i corresponding to the desired plate shape and the current rolling load distribution p _i , and is obtained by Expression (12).
δp _i = p ^opt _i −p _i (12)
FIG. 5 shows an example of a flowchart for executing the above procedure.

As shown in FIG. 4, in the divided backup rolls (i = w and i = d) located immediately above (or directly below) the rolled material edge, the divided backup roll loads q _w and q _d and the rolling loads p _w and p _Since the position where _d acts differs in the body length direction of the work roll 13, it is desirable to use the following formulas (2 ′) and (3 ′) instead of the above-described formulas (2) and (3).
^{_{y W i = K We ij p}} j -K W ij q j (2 ')
p _i = [K ^We ] ⁻¹ _ij {(K ^W _jk + K ^B _jk ) q _k + C ^W _j + C ^B _j } (3 ′)
Here, K ^We _ij is a work roll deflection deformation matrix in consideration of the working positions of the rolling loads p _w and p _d , and [K ^We ] ⁻¹ _ij is an inverse matrix thereof. As apparent from FIGS. 3 and 4, the operation positions of the rolling loads p _w and p _d can be easily obtained from measured values or estimated values of both edge positions of the rolled material, and the deformation matrix K ^We _ij and its inverse matrix [ K ^We ] ⁻¹ _ij can be calculated.

  Further, the fact that the thickness distribution in the width direction of the rolled material can be controlled by the present invention can be easily conceived by referring to, for example, pages 6 and 7 of Patent Document 2.

It is a side view which shows the plate rolling machine provided with the upper division | segmentation backup roll while enforcing the method of this invention. It is a top view which shows arrangement | positioning of the division | segmentation backup roll of the plate rolling machine shown in FIG. It is a schematic diagram explaining the positional relationship of the edge of a rolling material, and the edge of the division | segmentation backup roll located just above a rolling material edge. Loads q _w , q _i , q _d acting between the work roll and the divided backup roll, rolling loads p _w , p _i , p _d acting between the work roll and the rolled material, and a rolling load p ^* _w per unit width , P ^* _i , p ^* _d . It is the flowchart figure which illustrated the procedure for implementing the method of this invention.

Explanation of symbols

8 Split backup roll type plate rolling machine 9 Housing 10, 40 Roll assembly 13, 43 Work roll 15, 45 Inner housing 17 Main reduction device 18 Main load measuring device
21-27 Upper division backup roll 301-307 Upper division backup roll reduction device 321-327 Upper division backup roll load measuring device 51-57 Lower division backup roll 601-607 Lower division backup roll reduction device 621-627 Lower division backup roll load Measuring device 70 Rolled material edge position measuring device S Rolled material

Claims (2)

At least one of the upper and lower roll assemblies has a mechanism for supporting the upper and lower work rolls by a divided backup roll divided into three or more in the axial direction, and each divided backup roll has an independent load measuring device. In addition, a plate rolling machine equipped with a plate shape control device is used to estimate the plate shape during plate rolling based on the load and reduction position of each divided backup roll measured during plate rolling, and the target based on the estimation result In the plate shape control method for controlling the plate shape control device so as to have a shape, both edge positions in the width direction of the rolled material being rolled are measured or estimated, and the rolling of each divided backup roll is reduced based on the measured value or the estimated value. A plate shape control method in a plate rolling machine, wherein the position is controlled. A rolling mill for carrying out the plate shape control method according to claim 1, wherein both the plate edge measuring device and the plate width measuring device for measuring the positions of the plate edges in the plate width direction, respectively A plate rolling machine characterized in that a plate edge measuring device for measuring a position in the plate width direction is provided on at least one of an entrance side and an exit side of the rolling mill.

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