JP2000351010A - Method and apparatus for controlling sheet profile of rolled material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strip profile of a material to be rolled in a continuous rolling mill in which a work roll is shifted to control a sheet profile of a material to be rolled, in which factors such as a change in shape of the work roll can be considered. Provided is a control method and a plate profile control device. SOLUTION: A work roll shift area (Smin)
ＳSmax), the edge drop estimated value EDc is calculated (Step S4), and the minimum edge drop value EDmin is selected from the calculated values (Step S5: Y), and the shift amount at that time is set as the shift amount optimum value Sopt (Step S5). Step S
6). Then, the shift amount optimum value Opt is determined as the shift amount Sd (step S11), and the operation amount of the work roll bender device is determined based on the determined shift amount Sd (step S13).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet profile control method for controlling a sheet profile of a material to be rolled by a shift amount of a work roll in a rolling mill for rolling a material to be rolled by a work roll that shifts in an axial direction. The present invention relates to a plate profile control device.

[0002]

2. Description of the Related Art In continuous rolling, a material to be rolled is passed through a continuous rolling mill in which a plurality of stands having work rolls arranged vertically are arranged in tandem, and the material to be rolled is formed using the upper and lower work rolls. This is a method of finishing by applying a load to the product and rolling it.

FIG. 8 is a graph showing a sheet profile of a material to be rolled. The horizontal axis indicates the position in the width direction with the one end being positive and the other end being negative with the center at the center of the rolled material as the origin, and the vertical axis indicates the plate thickness. As shown in FIG. 8, in continuous rolling, indices such as a sheet crown indicating a difference in sheet thickness between the vicinity of the end and the center of the material to be rolled, and an edge drop indicating a change in the sheet thickness at the extreme end. A thickness distribution in the width direction called a plate profile shown occurs, and as a device for controlling the plate profile, a bender device for correcting deflection of a work roll due to a rolling load, a roll cloth device for changing a work roll crown, and the like are used. Have been.

[0004] Further, the shape of the work roll changes due to factors such as heat-up and wear during rolling, so that the effect on the sheet profile of the material to be rolled cannot be ignored. For example, the wear state of a work roll is greatly different between a portion corresponding to an end portion of a material to be rolled, a portion corresponding to a central portion, and a portion not in contact with a material to be rolled. And adversely affect the plate profile. Therefore, for example, when rolling a wide plate after rolling a large number of narrow plates, an abnormality in the plate thickness occurs at a position where the edge of the narrow plate hits. In addition, the condition of the work roll heat-up differs greatly between the portion in contact with the material to be rolled and the portion not in contact with the material to be rolled.

FIG. 9 is a graph showing a plate profile obtained by actually measuring work rolls after performing a number of rolling operations. The horizontal axis indicates the distance from one end of the work roll, and the vertical axis indicates the amount of deformation due to wear and heat-up. As shown in FIG. 9, a plurality of pairs of peaks occur because the material is deformed into a plate profile having a peak at a portion corresponding to the end of the material to be rolled, and a material to be rolled having a different plate width is rolled.

Therefore, the work roll is shifted in the axial direction to disperse the effects of wear and heat-up of the work roll in the roll axial direction, thereby suppressing the wear and heat-up at a specific position and controlling the plate profile. Rolling method,
It is disclosed in Japanese Patent No. 2616917. Patent No. 261691
In the method disclosed in Japanese Patent Publication No. 7, a work roll made of brittle but low-wear material is used for the upstream stand that has little effect on quality, and the work roll is shifted based on the sheet width of the material to be rolled. Determine the amount. For the stand on the downstream side that greatly affects the quality, use a work roll made of a material that is unlikely to cause cracks and other abnormalities even if the wear is large, and cyclically shift the shift amount by a predetermined amount for each material to be rolled. change.

[0007]

However, since the process of abrasion and heat-up of the work roll and the growth thereof are very complicated, the method disclosed in Japanese Patent No. Even if the control amount is adjusted, there is a problem that it cannot be said that the quality of the plate profile indicated by the index such as the edge drop and the plate crown can be sufficiently guaranteed.

The present invention has been made in view of such circumstances, and an object of the present invention is to form each edge drop corresponding to a plurality of shift values indicating a shift amount based on a predetermined calculation formula. Estimate, select the minimum value of the edge drop based on the estimation, determine the shift amount of the work roll based on the shift value corresponding to the selected edge drop, indicate by the index such as edge drop and sheet crown It is an object to provide a plate profile control method and a plate profile control device for improving the quality of a plate profile to be manufactured.

[0009]

According to a first aspect of the present invention, there is provided a method for controlling a sheet profile of a material to be rolled, wherein a shift amount of a work roll is adjusted by a rolling mill for rolling a material to be rolled by a work roll which shifts in an axial direction. In the sheet profile control method for controlling the sheet profile of the material to be rolled, an edge drop value, which is one of indexes indicating the sheet profile of the material to be rolled, is estimated from a plurality of shift amounts, and An edge drop value satisfying a required condition is selected from the drop values, and the shift amount of the work roll is determined based on the selected edge drop value.

According to a second aspect of the present invention, there is provided a method for controlling a sheet profile of a material to be rolled, comprising: a sheet crown control device for controlling a sheet crown; In a sheet profile control method of controlling a sheet profile of a material to be rolled by adjusting a shift amount of a roll and an operation amount of a sheet crown control device, a material to be rolled is obtained from a plurality of shift amounts based on a predetermined edge drop estimation formula. The edge drop value which is one of the indices indicating the plate profile of each is estimated, and an edge drop value satisfying a required condition is selected from a plurality of estimated edge drop values, and based on the selected edge drop value, Determine the shift amount of the work roll, and from the determined shift amount,
Based on a predetermined plate crown estimation formula, a plate crown value, which is one of indexes indicating the plate profile of the material to be rolled, is estimated,
The operation amount of the sheet crown control device is determined based on the estimated sheet crown value.

A plate profile control apparatus for a material to be rolled according to a third aspect of the present invention is a rolling machine that rolls a material to be rolled by a work roll that shifts in an axial direction. In a sheet profile control device for controlling a sheet profile, a means for estimating an edge drop value, which is one of indexes indicating a sheet profile of a material to be rolled, from a plurality of shift amounts, respectively, And means for selecting an edge drop value that satisfies the required condition, and means for determining the shift amount of the work roll based on the selected edge drop value.

According to a fourth aspect of the present invention, there is provided a sheet profile control apparatus for a material to be rolled, comprising a sheet crown control device for controlling a sheet crown, wherein the work is performed by a rolling mill that rolls the material to be rolled by a work roll that shifts in an axial direction. In a sheet profile control device for controlling a sheet profile of a material to be rolled by adjusting a shift amount of a roll and an operation amount of a sheet crown control device, a material to be rolled is obtained from a plurality of shift amounts based on a predetermined edge drop estimation formula. Means for estimating an edge drop value, which is one of the indices indicating the plate profile, a means for selecting an edge drop value satisfying a required condition from a plurality of estimated edge drop values, and a selected edge drop value Means for determining the shift amount of the work roll based on the calculated roll amount, and from the determined shift amount, the material to be rolled based on a predetermined plate crown estimation formula. Means for estimating the strip crown value, which is one indicator of the plate profile, based on the estimated strip crown value, characterized in that it comprises a means for determining an operation amount of strip crown control.

According to the plate profile control method and the plate profile control device of the present invention, each edge drop value is estimated from a plurality of shift amounts based on a calculation formula, and a required condition, for example, a minimum edge drop is determined from the values. By determining the shift amount based on the rolled material, it is possible to control the plate profile indicated by an index such as an edge drop and a sheet crown of the rolled material by obtaining the most appropriate shift amount for each rolled material. It is possible to improve the quality.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments. FIG. 1 is a schematic diagram showing a plate profile control device and a continuous rolling mill according to the present invention. In the figure, reference numeral 1 denotes a material to be rolled, and
Pair of upper and lower work rolls 21 to 27 for continuously rolling
And a pair of upper and lower reinforcing rolls 31 to 37 for supporting them
The first stand F1 to the seventh stand F7, each of which is provided in tandem with a predetermined distance from upstream to downstream, are provided. Each of the work rolls 21 to 27 is provided with a work roll bender device 41 to 47 that corrects the deflection of the work roll by hydraulic pressure and controls a plate profile, and further shifts the work rolls 21 to 27 to a shift amount target value. Roll shift devices 51 to 57 are provided.

The shift amount target values of the roll shift devices 51 to 57 and the operation amount target values of the work roll bender devices 41 to 47 receive values determined by the plate profile control device 60 using a calculation device such as a server computer. The plate profile control device 60 receives various measured values and operation condition values such as rolling conditions, and determines a shift amount target value for obtaining an optimum plate profile based on a predetermined calculation model. You. Note that a device such as a roll cloth device may be used instead of the work roll bender devices 41 to 47.

FIG. 2 is a schematic view showing a work roll provided in a continuous rolling mill from the front. As shown in FIG. 2, the work rolls 21 to 27 can shift the upper and lower work rolls by the same amount in opposite directions in the axial direction, respectively.
By adjusting the shift amount, the sheet profile of the material to be rolled 1 is controlled.

Next, the processing of the plate profile control device of the present invention will be described with reference to the flowchart shown in FIG. First, the shiftable minimum value Smin (mm), which is the minimum value in the shiftable range of the work roll to be shifted, is substituted for the shift amount temporary value Sc and the shift amount optimum value temporary value Sot, and the edge drop minimum value temporary value is substituted. Any larger value EDma for EDmin
An initialization process for substituting x (mm) is performed (step S1).

Then, a predetermined small shift amount ΔS is added to the temporary shift amount Sc (step S2), and the temporary shift amount S
c is compared with the maximum shiftable value Smax (step S
3). In step S3, when the temporary shift amount Sc is smaller than the maximum shiftable value Smax (step S3:
Y) It is determined that the entire shiftable area has not yet been determined. Then, based on an edge drop calculation model (edge drop estimation formula) prepared in advance, based on information on rolling such as the material of the material to be rolled, the shape of the work roll, and rolling conditions, the amount of shift when the shift amount is Sc is determined. Rolled material 1
EDc is calculated at a certain position from the outermost end to an arbitrary distance (step S).
4).

The edge drop calculation model and the information relating to the rolling are determined in consideration of factors such as the type and accuracy of the information to be obtained and the calculation load of the plate profile control device, and are determined to be optimal for the plate profile control device to be applied. The more information you have, the higher the accuracy, and the higher the accuracy of the edge drop calculation model,
It goes without saying that a highly accurate edge drop estimated value EDc is calculated.

The calculated edge drop estimated value E
Dc is compared with the provisional edge drop minimum value EDmin (step S5). In step S5, if the estimated edge drop value EDc is smaller than the provisional edge drop minimum value EDmin (step S5: Y), the shift amount is Smin.
In the range from to Sc, it is determined that the edge drop is smallest when the shift amount is Sc, and the value indicated by the edge drop estimated value EDc at this time is set as the edge drop minimum temporary value EDmin, and the shift amount temporary value is determined. The value indicated by Sc is set as a shift amount optimum value provisional value Sopt (step S
6).

In step S5, when the estimated edge drop value EDc is larger than the provisional edge drop minimum value EDmin (step S5: N), when the shift amount is Sc, it is determined that the edge drop does not take the minimum value. It returns to step S2 and repeats the processing from step S3.
By repeating the processing of steps S2 to S6 in this manner, it is possible to select an optimum shift amount that satisfies the condition that the estimated edge drop value EDc is the minimum in the shiftable range in the shiftable range.

In step S3, the temporary shift amount Sc
Is larger than the maximum shiftable value Smax (step S
3: N), it is determined that the edge drop has been estimated over the entire shiftable area. The shift amount optimum value provisional value Sopt at this stage is the shift amount optimum value, and the shift amount is Sop.
The edge drop estimated value when t is set is EDmin.

Then, the optimum shift amount provisional value Opt is determined as the shift amount Sd (step S11), and the determined shift amount Sd is transmitted from the plate profile control device 60 to the roll shift devices 51 to 57, and the roll shift devices 51 to 57 are transmitted. 57
Then, the shift amount of the work rolls 21 to 27 is controlled using the shift amount Sd as a shift amount target value.

Further, based on a prepared sheet crown calculation model (sheet crown estimation formula), the sheet crown estimation of the material 1 to be rolled when the shift amount is set to Sd from the shift amount Sd and the information on rolling. The value Crd is calculated (step S12). In the sheet crown calculation model used here, the sheet crown value represented by the difference between the sheet thickness at the center in the width direction of the material to be rolled and the sheet thickness at a predetermined position to guarantee the quality is obtained. Can be Then, the operation amount of the work roll bender devices 41 to 47 is determined so that the plate crown becomes the target plate crown by comparing the estimated plate crown value Crd with the predetermined target plate crown Cram (step S13), and the determined operation amount is determined. Is transmitted to the work roll vendor devices 41 to 47.

Next, the results of a comparison test between the plate profile control method of the present invention and the conventional plate profile control method will be described. FIG. 4 is a graph showing the relationship between the number of rolls and the shift amount in a rolling mill to which the conventional plate profile control method is applied, and FIG. 5 is a graph showing the relationship between the number of rolls and edge drop and plate crown. FIG. 6 is a graph showing the relationship between the number of rolls and the shift amount in a rolling mill to which the plate profile control method of the present invention is applied, and FIG. 7 is a graph showing the relationship between the number of rolls and edge drop and plate crown. .

In FIG. 4, FIG. 5, FIG. 6, and FIG. 7, the horizontal axis indicates the number of rolls, and the vertical axis indicates the shift amount, or the edge drop and the sheet crown. In the conventional plate profile control method, the shift amount changes cyclically with each rolling, and the plate crown changes around the target value, but the edge drop changes greatly, and the value also increases. . On the other hand, in the plate profile control method of the present invention, the change of the shift amount is not regular, but the plate crown and the edge drop are small and the values are stable. As described above, according to the sheet profile control method of the present invention, it is possible to improve the quality of the sheet profile such as the edge drop and the sheet crown of the material to be rolled.

[0027]

As described above in detail, in the method and the apparatus for controlling the profile of a material to be rolled according to the present invention, each material to be rolled is controlled based on information on rolling given in advance. By estimating the edge drop value of the material to be rolled with respect to the shift amount, determining the shift amount at which the edge drop value becomes the best, and determining the target value of the sheet crown from the shift amount, an appropriate shift for each rolling is performed. Since it is possible to control the plate profile indicated by the index such as the edge drop and the plate crown of the material to be rolled by obtaining the amount, it is possible to improve the quality of the material to be rolled, etc.
It has excellent effects.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a plate profile control device and a continuous rolling mill of the present invention.

FIG. 2 is a schematic view showing a work roll provided in a continuous rolling mill from the front.

FIG. 3 is a flowchart showing a process of the plate profile control device of the present invention.

FIG. 4 is a graph showing the relationship between the number of rolls and the shift amount in a rolling mill to which a conventional plate profile control method is applied.

FIG. 5 is a graph showing the relationship between the number of rolls, an edge drop, and a sheet crown in a rolling mill to which a conventional sheet profile control method is applied.

FIG. 6 is a graph showing the relationship between the number of rolls and the shift amount in a rolling mill to which the plate profile control method of the present invention is applied.

FIG. 7 is a graph showing a relationship between the number of rolls, an edge drop, and a sheet crown in a rolling mill to which the sheet profile control method of the present invention is applied.

FIG. 8 is a graph showing a sheet profile of a material to be rolled.

FIG. 9 is a graph showing a plate profile obtained by actually measuring work rolls after performing a number of rolling operations.

[Explanation of symbols]

 F1 to F7 First to seventh stands 1 Rolled material 21 to 27 Work roll 31 to 37 Reinforcement roll 41 to 47 Work roll bender device 51 to 57 Roll shift device 60 Plate profile control device

Claims (4)

[Claims] 1. A sheet profile control method for controlling a sheet profile of a material to be rolled by adjusting a shift amount of a work roll in a rolling mill that rolls the material to be rolled by a work roll that shifts in an axial direction. From the shift amount, an edge drop value, which is one of the indices indicating the sheet profile of the material to be rolled, was estimated, and an edge drop value satisfying a required condition was selected from the estimated plurality of edge drop values. A sheet profile control method for a material to be rolled, wherein a shift amount of a work roll is determined based on an edge drop value. 2. A rolling mill for rolling a material to be rolled by a work roll which shifts in an axial direction, comprising: a work crown control device for controlling a work crown; In a sheet profile control method for controlling a sheet profile of a material to be rolled by adjusting, based on a predetermined edge drop estimating equation, an edge drop which is one of indexes indicating a sheet profile of a material to be rolled is obtained from a plurality of shift amounts. Estimate the respective values, select the edge drop value that satisfies the required conditions from the estimated multiple edge drop values, determine the work roll shift amount based on the selected edge drop value, and determine the determined shift amount. From the above, a sheet crown value, which is one of the indices indicating the sheet profile of the material to be rolled, is estimated based on a predetermined sheet crown estimation formula, and the estimated sheet crown Based on the round value, the plate profile control method of the rolled material, characterized by determining the amount of operation of the strip crown controller. 3. A plate profile control device for controlling a plate profile of a material to be rolled by adjusting a shift amount of a work roll by a rolling mill that rolls the material to be rolled by a work roll that shifts in an axial direction. A means for estimating an edge drop value, which is one of indexes indicating a sheet profile of a material to be rolled, from the shift amount; and a means for selecting an edge drop value satisfying a required condition from a plurality of estimated edge drop values. And a means for determining a shift amount of the work roll based on the selected edge drop value. 4. A rolling mill for rolling a material to be rolled by a work roll which shifts in an axial direction, comprising: a sheet crown control device for controlling a sheet crown; A plate profile control device for adjusting and controlling a plate profile of a material to be rolled, comprising: an edge drop which is one of indexes indicating a plate profile of a material to be rolled from a plurality of shift amounts based on a predetermined edge drop estimation formula. A means for estimating a value, a means for selecting an edge drop value satisfying a required condition from a plurality of estimated edge drop values, and a means for determining a shift amount of a work roll based on the selected edge drop value. From the determined shift amount, based on a predetermined plate crown estimation formula, a plate crown which is one of the indices indicating the plate profile of the material to be rolled. Means for estimating a value, based on the estimated strip crown value, the plate profile control device for the rolled material, characterized in that it comprises means for determining a manipulated variable of the strip crown controller.