JP2020163400A - Method and apparatus for setting upper limit value of roll offset amount in tandem rolling equipment - Google Patents

Abstract

To provide a method and apparatus for setting the upper limit value of a roll offset amount in tandem rolling equipment, capable of appropriately setting the upper limit value of the offset amount of a work roll in a tandem rolling mill.SOLUTION: A method for setting the upper limit value of a roll offset amount in tandem rolling equipment includes: a rolled-plate cross-sectional shape analysis step (Step S5) of, while variously changing an offset amount L of a work roll 11 of a rolling mill 10 where the work roll 11 is to be offset, executing rolled-plate cross-sectional shape analysis in which the deformation in the rolling direction of the work roll 11 of each rolling mill 10 is additionally taken into account, and calculating the plate cross-sectional shape of a rolled material perpendicular to the rolling direction; and an upper-limit-value setting step (Step S6) of setting, as the upper limit value, the absolute value of the offset amount of the work roll 11 such that the variation varying relative to a plate cross-sectional shape based on a plate thickness and a plate width set by a post-rolling rolled-material setting step (Step S2), of the plate cross-sectional shape of a rolled material S calculated by the rolled-plate cross-sectional shape analysis step (Step S5), becomes an allowable value set by an allowable-value setting step (Step S3).SELECTED DRAWING: Figure 3

Description

The present invention relates to a method and a setting device for setting an upper limit value of a roll offset amount in a tandem rolling mill.

Generally, a tandem rolling facility has a row of rolling mills in which a plurality of rolling mills (stands) are arranged in the traveling direction of the rolled material, and the payoff reels arranged on the entrance side of the first stand and the exit side of the final stand are arranged. The rolling work is performed while applying tension to the rolled material wound around the tension reel. Here, the rolling mill is a four-stage rolling mill having a pair of upper and lower working rolls and a pair of upper and lower reinforcing rolls for reinforcing the upper and lower working rolls, and an intermediate roll is arranged between each working roll and each reinforcing roll. There is a 6-stage rolling mill.

Here, as a conventional tandem rolling apparatus, for example, the one shown in Patent Document 1 is known.
The tandem rolling equipment shown in Patent Document 1 is a tandem rolling mill in which a plurality of rolling mills having a working roll and a reinforcing roll are arranged in the path direction of the rolled material, and the working roll axis is relative to the reinforcing roll axis. It has at least one rolling mill that is offset in the direction in which the tension acting on the rolled material is large.
According to the tandem rolling equipment shown in Patent Document 1, when there is a difference in tension applied to the inlet side and the outlet side of the rolled material, the work roll axis is offset from the reinforcing roll axis toward the larger tension. By doing so, the bearing box of the work roll is always pressed to either the entry side or the exit side, whichever has the higher tension, and stable rolling can be realized.

On the other hand, in recent years, consumer demands for the properties of plate materials produced by rolling various materials have become more and more strict, and it is desired that the plate shape can be controlled with high accuracy. In addition, the demand for using small-diameter work rolls is also very high due to the demand for increasing the rolling reduction rate and imparting higher gloss.
However, when a small-diameter working roll is used in a rolling mill of a conventional tandem rolling mill such as the tandem rolling mill shown in Patent Document 1, there is a problem that the working roll tends to bend in the horizontal direction and the control characteristics of the plate shape deteriorate. ..

Therefore, in order to solve this problem, those shown in Patent Document 2 are conventionally known.
The tandem rolling equipment shown in Patent Document 2 is tandem rolling having a row of rolling mills in which a plurality of rolling mills having a vertical work roll and vertical support rolls arranged above and below the work roll are arranged in the path direction of the rolling material. In the machine, at least one of the plurality of rolling mills uses the vertical work roll as a drive roll, and the axis of the vertical work roll is the axis of the vertical support roll on the side opposite to the side where the tension acting on the rolled material is large. It is a roll offset rolling mill arranged so as to be offset from each other.

According to the tandem rolling apparatus shown in Patent Document 2, the horizontal force applied to the work roll can be reduced by arranging the axis of the vertical work roll on the side opposite to the side having the large tension, and as a result, the work roll can be reduced. The horizontal deflection of the plate can be reduced, and rolling with excellent plate shape control characteristics can be performed using a small-diameter work roll.

JP-A-54-39348 JP-A-2002-239609

However, the tandem rolling equipment shown in Patent Document 1 and the tandem rolling equipment shown in Patent Document 2 have the following problems.
That is, when determining the horizontal offset amount of the work roll, in the tandem rolling equipment shown in Patent Document 1, a relative judgment is made in consideration of the bearing life and the like, and in the tandem rolling equipment shown in Patent Document 2, the work roll is determined. The offset amount is determined based on the fact that the amount of deflection in the horizontal direction is relatively small.

However, in both the tandem rolling facilities shown in Patent Documents 1 and 2, the upper limit of the horizontal offset amount of the working roll is not determined. In an actual rolling mill, rolled materials having various plate widths, plate thicknesses, and deformation resistances are rolled, so the rolling schedule is innumerable. In the case of the tandem rolling equipment shown in Patent Document 1, the horizontal offset amount of the working roll May exceed the upper limit value, and in that case, the plate thickness becomes thicker at the central portion in the width direction than at the end portion in the width direction, resulting in a defective plate shape. On the other hand, in the case of the tandem rolling equipment shown in Patent Document 2, the horizontal deflection of the work roll is reduced by arranging the axis of the vertical work roll on the side opposite to the side having the large tension. As described above, in the rolling mill of the above, since the rolling schedule is innumerable, the magnitude of the horizontal component of the force acting on the working roll fluctuates, and the plate shape may not fall within the desired range.

Therefore, the present invention has been made to solve this conventional problem, and an object of the present invention is in a tandem rolling mill capable of appropriately setting an upper limit of an offset amount of a working roll in a tandem rolling mill. An object of the present invention is to provide a method and a setting device for setting an upper limit value of a roll offset amount.

In order to achieve the above object, the method of setting the upper limit value of the roll offset amount in the tandem rolling mill according to one aspect of the present invention is to reinforce each of a pair of upper and lower working rolls and a pair of upper and lower working rolls. The rolling mills provided with the reinforcing rolls of the above are arranged in a row of rolling mills in the rolling direction of the rolled material, and at least one rolling mill has the axis of the working roll as the axis of the reinforcing roll. On the other hand, it is a method of setting the upper limit of the roll offset amount in the tandem rolling equipment offset on the entry side or the exit side with respect to the rolling direction of the rolled material, and is the mechanical properties, plate thickness and plate thickness of the rolled material before rolling. A pre-rolled rolled material setting step for setting the plate width, a post-rolled rolled material setting step for setting the mechanical properties, plate thickness and plate width of the rolled material after rolling, and a rolled material perpendicular to the rolling direction after rolling. The permissible value setting step for setting the permissible value of the amount of change in which the plate cross-sectional shape changes with respect to the plate cross-sectional shape based on the plate thickness and the plate width set in the post-rolling rolled material setting step, and the pre-rolling material setting The mechanical properties, plate thickness and plate width of the rolled material before rolling and the mechanical properties, plate thickness and plate width of the rolled material after rolling set in the step. Based on the above, a rolling schedule determination step for determining the rolling schedule including the entry side tension, the exit side tension and the rolling load in each rolling mill, and the entry side tension in each rolling mill determined in the rolling schedule determination step. , The output tension, and the rolling load are used to calculate the force acting on each work roll of each rolling mill, and the offset amount of the work roll of the rolling mill that offsets the work roll is variously changed to work on each rolling mill. Calculated by the rolled plate cross-sectional shape analysis step of calculating the plate cross-sectional shape of the rolled material perpendicular to the rolling direction by performing the rolled plate cross-sectional shape analysis considering the deformation of the rolling direction of the roll, and the rolled plate cross-sectional shape analysis step. The amount of change in the plate cross-sectional shape of the rolled material with respect to the plate cross-sectional shape based on the plate thickness and plate width set in the post-rolled rolled material setting step is set in the permissible value setting step. The gist is to include an upper limit value setting step in which the absolute value of the offset amount of the work roll, which is an allowable value, is set as the upper limit value.

Further, in the method of setting the upper limit value of the roll offset amount in the tandem rolling apparatus according to another aspect of the present invention, a pair of upper and lower working rolls and a pair of upper and lower reinforcing rolls for reinforcing each of the upper and lower working rolls are used. It has a row of rolling mills in which a plurality of rolling mills are arranged in the rolling direction of the rolled material, and at least one rolling mill has the axis of the working roll as the axis of the reinforcing roll. It is a method of setting the upper limit of the roll offset amount in a tandem rolling equipment offset on the entry side or the exit side with respect to the rolling direction, and is the mechanical properties, plate thickness and plate width of a plurality of types of rolled materials before rolling. Pre-rolling material setting step to set, post-rolling rolling material setting step to set the mechanical properties, plate thickness and plate width of multiple types of rolled material after rolling, and multiple types perpendicular to the rolling direction after rolling. Allowable value for changing the plate cross-sectional shape of the rolled material with respect to the plate cross-sectional shape based on the plate thickness and plate width set in the post-rolled rolled material setting step for each type of rolled material The mechanical properties, plate thickness and plate width of a plurality of types of rolled materials before rolling set in the setting step and the pre-rolled rolled material setting step, and the post-rolled material set in the post-rolled rolled material setting step. Based on the mechanical properties, plate thickness and plate width of multiple types of rolled materials, a rolling schedule including entry side tension, exit side tension and rolling load at each rolling mill is determined for each type of rolling material. Using the schedule determination step and the inlet tension, outlet tension, and rolling load for each type of rolled material in each rolling mill determined in the rolling schedule determination step, each for each type of rolled material in each rolling mill. While calculating the force acting on the work roll, the offset amount of the work roll of the rolling mill that offsets the work roll is variously changed, and rolling for each type of rolling material in consideration of the deformation of the work roll of each rolling mill in the rolling direction. A rolled plate cross-sectional shape analysis step for calculating a plate cross-sectional shape of a plurality of types of rolled materials perpendicular to the rolling direction by performing a plate cross-sectional shape analysis, and the plurality of types of rolled materials calculated by the rolled plate cross-sectional shape analysis step. The amount of change in the plate cross-sectional shape based on the plate thickness and plate width set in the post-rolled rolled material setting step becomes the permissible value set in the permissible value setting step. The absolute value of the offset amount of the work roll is calculated for each type of rolled material, and the absolute value of the smallest offset amount among the calculated absolute values of the offset amount of the work roll for each type of rolled material is set as the upper limit value. Upper limit setting The gist is to include Tep.

Further, the apparatus for setting the upper limit value of the roll offset amount in the tandem rolling apparatus according to another aspect of the present invention includes a pair of upper and lower working rolls and a pair of upper and lower reinforcing rolls for reinforcing each of the upper and lower working rolls. It has a row of rolling mills in which a plurality of rolling mills are arranged in the rolling direction of the rolled material, and at least one rolling mill has the axis of the working roll as the axis of the reinforcing roll. A device for setting the upper limit of the roll offset amount in a tandem rolling facility offset on the entry side or the exit side with respect to the rolling direction, and sets the mechanical properties, plate thickness and plate width of the rolled material before rolling. The pre-rolled rolled material setting section, the post-rolled rolled material setting section that sets the mechanical properties, plate thickness and plate width of the rolled material after rolling, and the plate cross-sectional shape of the rolled material perpendicular to the rolling direction after rolling are described above. The permissible value setting unit for setting the permissible value of the amount of change with respect to the plate cross-sectional shape based on the plate thickness and the plate width set in the post-rolled rolled material setting unit, and the pre-rolling material setting unit set. Based on the mechanical properties, plate thickness and plate width of the rolled material before rolling, and the mechanical properties, plate thickness and plate width of the rolled material after rolling set in the post-rolled rolled material setting unit. A rolling schedule determination unit that determines a rolling schedule including entry-side tension, exit-side tension, and rolling load at each rolling mill, and entry-side tension, exit-side tension at each rolling mill determined by the rolling schedule determination unit, And the rolling load is used to calculate the force acting on each work roll of each rolling mill, and the offset amount of the work roll of the rolling mill that offsets the work roll is variously changed in the rolling direction of the work roll of each rolling mill. The rolled plate cross-sectional shape analysis unit that calculates the plate cross-sectional shape of the rolled material perpendicular to the rolling direction by performing the rolled plate cross-sectional shape analysis considering deformation, and the rolled material calculated by the rolled plate cross-sectional shape analysis unit. Work in which the amount of change in the plate cross-sectional shape with respect to the plate cross-sectional shape based on the plate thickness and plate width set by the rolled material setting unit after rolling becomes the allowable value set by the allowable value setting unit. The gist is to include an upper limit value setting unit that sets the absolute value of the roll offset amount as the upper limit value.

Further, the apparatus for setting the upper limit value of the roll offset amount in the tandem rolling apparatus according to another aspect of the present invention includes a pair of upper and lower working rolls and a pair of upper and lower reinforcing rolls for reinforcing each of the upper and lower working rolls. It has a row of rolling mills in which a plurality of rolling mills are arranged in the rolling direction of the rolled material, and at least one rolling mill has the axis of the working roll as the axis of the reinforcing roll. It is a device for setting the upper limit of the roll offset amount in a tandem rolling facility that is offset on the entry side or the exit side with respect to the rolling direction, and is the mechanical property, plate thickness and plate width of a plurality of types of rolled materials before rolling. A pre-rolling material setting unit for setting, a post-rolling material setting unit for setting the mechanical properties, plate thickness and plate width of multiple types of rolled material after rolling, and a plurality of types perpendicular to the rolling direction after rolling. Allowable value for changing the plate cross-sectional shape of the rolled material with respect to the plate cross-sectional shape based on the plate thickness and plate width set in the rolled material setting unit after rolling for each type of rolled material The mechanical properties, plate thickness and plate width of a plurality of types of rolled materials before rolling set by the setting unit and the pre-rolling material setting unit, and the post-rolling material set by the post-rolling material setting unit. Based on the mechanical properties, plate thickness and plate width of multiple types of rolled materials, a rolling schedule including entry side tension, exit side tension and rolling load at each rolling mill is determined for each type of rolling material. Each of the rolling material types of each rolling mill using the inlet tension, the exit tension, and the rolling load for each type of rolling material in each rolling mill determined by the schedule determination unit and the rolling schedule determination section. While calculating the force acting on the work roll, the offset amount of the work roll of the rolling mill that offsets the work roll is variously changed, and rolling for each type of rolling material in consideration of the deformation of the work roll of each rolling mill in the rolling direction. A rolled plate cross-sectional shape analysis unit that performs plate cross-sectional shape analysis to calculate the plate cross-sectional shape of a plurality of types of rolled materials perpendicular to the rolling direction, and the plurality of types of rolled materials calculated by the rolled plate cross-sectional shape analysis unit. The amount of change in the plate cross-sectional shape based on the plate thickness and plate width set by the rolled material setting unit after rolling becomes the permissible value set by the permissible value setting unit. The absolute value of the offset amount of the work roll is calculated for each type of rolled material, and the absolute value of the smallest offset amount among the calculated absolute values of the offset amount of the work roll for each type of rolled material is set as the upper limit value. The gist is to provide an upper limit value setting unit.

According to the method and apparatus for setting the upper limit of the roll offset amount in the tandem rolling apparatus according to the present invention, the tandem rolling machine can appropriately set the upper limit of the offset amount of the working roll or the intermediate roll. It is possible to provide a method and a setting device for setting an upper limit value of the roll offset amount in the equipment.

It is a schematic block diagram of an example of the tandem rolling mill to which the method of setting the upper limit value of the roll offset amount which concerns on 1st Embodiment of this invention is applied. It is a schematic block diagram of the setting apparatus of the upper limit value of the roll offset amount in the tandem rolling mill which concerns on 1st Embodiment of this invention. It is a flowchart which shows the process flow in the setting apparatus of the upper limit value of the roll offset amount shown in FIG. It is a schematic block diagram of an example of the tandem rolling mill to which the method of setting the upper limit value of the roll offset amount which concerns on 2nd Embodiment of this invention is applied. It is a schematic block diagram of an example of the tandem rolling mill to which the method of setting the upper limit value of the roll offset amount which concerns on 3rd Embodiment of this invention is applied. It is a graph which shows the relationship between the difference between the plate thickness of the central portion of the plate width and the plate thickness of the end portion in the plate width direction, and the offset amount of the intermediate roll when rolling a high-tensile steel material as a rolling material. It is a graph which shows the relationship between the difference between the plate thickness of the central portion of the plate width and the plate thickness of the end portion in the plate width direction, and the offset amount of the intermediate roll when rolling mild steel as a rolling material.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention describes the material, shape, structure, arrangement, etc. of the components. It is not specified in the following embodiments.
The drawings are schematic. Therefore, it should be noted that the relationship, ratio, etc. between the thickness and the plane dimension are different from the actual ones, and there are parts where the relationship and ratio of the dimensions are different between the drawings.

(First Embodiment)
FIG. 1 shows a schematic configuration of an example of a tandem rolling apparatus to which the method for setting an upper limit of the roll offset amount according to the first embodiment of the present invention is applied. The tandem rolling apparatus 1 is a rolled material S. A rolling mill in which a plurality of rolling mills 10 (three in the present embodiment) for rolling the rolled material S unwound from the payoff reel 2 are arranged in the rolling direction of the rolled material S. A row 3 and a tension reel 4 for winding the rolled rolled material S are provided.
Each rolling mill 10 in the rolling mill row 3 is composed of a four-stage rolling mill, and a pair of upper and lower working rolls 11 for rolling the rolled material S and a pair of upper and lower reinforcing rolls 12 for reinforcing each of the pair of upper and lower working rolls 11. And have.

Then, the final stand in the rolling mill row 3 and the most downstream rolling mill 10 are rolled materials with respect to each axis CL ₁₁ of the pair of upper and lower working rolls 11 with respect to each axis CL _{12 of the} pair of upper and lower reinforcing rolls 12. It is arranged so as to be offset by an offset amount L ₁₁ on the exit side of S in the rolling direction.
In this way, the offset amount L of each axis CL ₁₁ of the pair of upper and lower working rolls 11 in the final stand with respect to each axis CL ₁₂ of the pair of upper and lower reinforcing rolls 12 on the exit side of the rolled material S in the rolling direction. Stable rolling can be realized by arranging only _{11 at an} offset.

Here, if the offset amount L ₁₁ of the work roll 11 exceeds the upper limit value, the work roll 11 is deformed, and the plate thickness of the rolled material S becomes thicker at the center portion in the width direction than at the end portion in the width direction. May be invited.
Therefore, in the present embodiment, the upper limit of the offset amount L ₁₁ of each of the pair of upper and lower working rolls 11 on the final stand is set before rolling the rolled material S.

FIG. 2 shows a schematic configuration of a device for setting an upper limit value of the roll offset amount in the tandem rolling mill according to the first embodiment of the present invention.
The upper limit value setting device 20 for the roll-off set amount shown in FIG. 2 includes a pre-rolling material setting unit 21, a post-rolling material setting unit 22, an allowable value setting unit 23, a rolling schedule determination unit 24, and rolling. It includes a plate cross-sectional shape analysis unit 25, an upper limit value setting unit 26, and an output unit 27.

Here, the roll-off set amount upper limit setting device 20 includes a pre-rolled rolled material setting unit 21, a post-rolled rolled material setting unit 22, an allowable value setting unit 23, a rolling schedule determination unit 24, and a rolled plate cross-sectional shape analysis unit. It is a computer system for realizing each function of 25 and the upper limit value setting unit 26 on computer software, that is, by executing a computer-readable program. Then, this computer system communicates with various dedicated computer programs stored in advance in the hardware, via a recording medium such as a CD-ROM, a DVD-ROM, or a flexible disk (FD), or via the Internet or the like. By executing a computer program installed in hardware via a network, each of the above-mentioned functions can be realized on software. Further, the output unit 27 is realized by an output device such as a printer.

The pre-rolling rolled material setting unit 21 acquires information on a plurality of types of rolled material S before rolling to be rolled from a high-level computer (not shown), and the mechanical properties, plate thickness, and plate of the plurality of types of rolled material S before rolling. Set the width. Here, the mechanical properties of the rolled material S mean mechanical properties such as tensile strength and deformation resistance determined for each steel type of the rolled material S. Further, if at least one of the mechanical properties, the plate thickness and the plate width of the rolled material S is different, different types of rolled material S are used.
Further, the post-rolled rolled material setting unit 22 acquires information on a plurality of types of rolled material S after rolling scheduled to be rolled from a higher-level computer (not shown), and mechanical properties and plate thickness of the plurality of types of rolled material S after rolling. And set the plate width.

Further, in the permissible value setting unit 23, the plate cross-sectional shape of a plurality of types of rolled material S perpendicular to the rolling direction after rolling is changed to a plate cross-sectional shape based on the plate thickness and plate width set by the rolled material setting unit 22 after rolling. On the other hand, the permissible value of the amount of change that changes is set for each type of the rolled material S. Here, the amount of change in the plate cross-sectional shape of the rolled material perpendicular to the rolling direction after rolling with respect to the plate cross-sectional shape based on the plate thickness and plate width set by the rolled material setting unit 22 after rolling is rolling. It means the amount of deformation of the plate cross-sectional shape of the rolled material perpendicular to the later rolling direction from the plate cross-sectional shape based on the plate thickness and plate width set by the post-rolled rolled material setting unit 22. For example, the difference between the plate thickness at the center of the plate width and the plate thickness at a predetermined position from the end in the plate width direction in the plate cross-sectional shape based on the plate thickness and plate width set by the post-rolling material setting unit 22 (rolling after rolling). The difference is how much the difference 0) changes in the cross-sectional shape set by the material setting unit 22, and the permissible value of the difference is, for example, 20 mm from the end portion in the plate width direction with respect to the plate thickness at the center portion of the plate width. It is a value that does not reduce the plate thickness by 30 μm.

Further, the rolling schedule determination unit 24 is set by the pre-rolling material setting unit 21, the mechanical properties, the plate thickness and the plate width of the plurality of types of the rolled material S before rolling, and the post-rolling material setting unit 22. Based on the set mechanical properties, plate thickness and plate width of the plurality of types of rolled materials S after rolling, the rolling schedule including the entry side tension, the exit side tension and the rolling load at each rolling mill 10 is rolled. Determined for each type of material S.
Further, the rolled plate cross-sectional shape analysis unit 25 uses the in-side tension, the out-side tension, and the rolling load for each type of the rolled material S in each rolling machine 10 determined by the rolling schedule determination unit 24 in each rolling mill. The force acting on each work roll 11 of 10 is calculated, and the offset amount L ₁₁ of the rolling mill 10 that offsets the work roll 11, that is, the work roll 11 of the final stand is variously changed, and the work roll 11 of each rolling mill 10 is changed. The cross-sectional shape of the rolled plate is analyzed in consideration of the deformation of the rolling direction, and the cross-sectional shapes of the plurality of types of rolled materials S perpendicular to the rolling direction are calculated.

Here, when calculating the force acting on each work roll 11 and intermediate roll 13 of each rolling mill 10, the entry side for each type of rolled material S in each rolling mill 10 determined by the rolling schedule determination unit 24. In addition to tension, output tension, and rolling load, the acceleration rate of the rolled material S and the magnitude of frictional resistance of the bearings of each work roll 11 are determined from the equipment specifications of the tandem rolling equipment 1 input from a higher-level computer (not shown). Consider the conditions as well.
The reason why the deformation of the working roll 11 of each rolling mill 10 in the rolling direction is also taken into consideration when performing the cross-sectional shape analysis of the rolled plate is as follows.

That is, conventionally, a method of numerically analyzing the cross-sectional shape of the rolled material S perpendicular to the rolling direction after passing through the rolling mill 10 has been established, but each of the two dimensions in the cross section perpendicular to the rolling direction has been established. Most of the analyzes considered the elastic deformation of the working roll 11 and the plastic deformation of the rolled material S. This is because, in the past, the diameter of each work roll 11 is relatively large and the deformation in the horizontal direction (rolling direction) is sufficiently small, so that there is no problem even if the deformation in the horizontal direction is ignored in the analysis of the cross-sectional shape of the rolled plate. Because it wasn't. However, in recent years, consumer demands for the properties of plate materials manufactured by rolling various materials have become more and more strict, and it is desired that the plate shape can be controlled with high accuracy. In addition, the demand for using small-diameter work rolls is also very high due to the demand for increasing the rolling reduction rate and imparting higher gloss. When this small diameter working roll (in the case of a cold rolling mill, the diameter is about 400 mm or less) is used, the influence of the horizontal direction (rolling direction) deformation of the small diameter working roll on the cross-sectional shape of the rolled plate cannot be ignored. Therefore, in setting the upper limit of the roll offset amount in the tandem rolling mill according to the present embodiment, it is assumed that each rolling mill 10 uses a small diameter working roll (in the case of a cold rolling mill, the diameter is about 400 mm or less). In the rolling plate cross-sectional shape analysis, not only the elastic deformation of each two-dimensional working roll 11 and the plastic deformation of the rolled material S in the cross section perpendicular to the rolling direction, but also the rolling direction of the working roll 11 of each rolling mill 10. The deformation of is also taken into consideration.

Then, the upper limit value setting unit 26 is the plate thickness set by the rolled material setting unit 22 after rolling of the plate cross-sectional shapes of a plurality of types of rolled materials S perpendicular to the rolling direction calculated by the rolled plate cross-sectional shape analysis unit 25. The absolute value of the offset amount of the work roll 11 in which the amount of change with respect to the plate cross-sectional shape based on the plate width becomes the allowable value set by the allowable value setting unit 23 is calculated for each type of the rolled material S. Then, the upper limit value setting unit 26 sets the absolute value of the smallest offset amount among the calculated absolute values of the offset amount of the work roll 11 for each type of the rolled material S as the upper limit value.
Further, the output unit 27 outputs the upper limit value of the absolute value of the offset amount L ₁₁ of the work roll 11 of the final stand set by the upper limit value setting unit 26.

Next, the processing flow in the device 20 for setting the upper limit value of the offset amount L ₁₁ will be described with reference to FIG.
The device 20 for setting the upper limit value of the offset amount L ₁₁ is a pre-rolling material setting step S1 shown below, a post-rolling rolling material setting step S2, an allowable value setting step S3, and a rolling schedule determination. Step S4, which is a step, step S5, which is a rolled plate cross-sectional shape analysis step, and step S6, which is an upper limit value setting step, are executed. The output unit 27 executes step S7.

First, in step S1, the pre-rolling material setting unit 21 sets the mechanical properties, plate thickness, and plate width of a plurality of types of rolled materials S before rolling (pre-rolling material setting step).
Next, in step S2, the post-rolled rolled material setting unit 22 sets the mechanical properties, plate thickness, and plate width of the plurality of types of rolled material S after rolling (post-rolled rolled material setting step).
Further, in step S3, the permissible value setting unit 23 determines the plate thickness and plate in which the plate cross-sectional shape of a plurality of types of rolled material S perpendicular to the rolling direction after rolling is set in step S2 (rolled material setting step after rolling). An allowable value of the amount of change that changes with respect to the cross-sectional shape of the plate based on the width is set for each type of the rolled material S (allowable value setting step).

Then, in step S4, the rolling schedule determination unit 24 determines the mechanical properties, plate thickness, and plate width of the plurality of types of rolled material S before rolling, which are set in step S1 (pre-rolling material setting step), and the step. Based on the mechanical properties, plate thickness and plate width of a plurality of types of rolled material S after rolling, which are set in S2 (rolled material setting step after rolling), the entry side tension and the exit side in each rolling mill 10 A rolling schedule including tension and rolling load is determined for each type of rolling material S (rolling schedule determination step).
Next, in step S5, the rolled plate cross-sectional shape analysis unit 25 performs a rolled plate cross-sectional shape analysis (rolled plate cross-sectional shape analysis step).

Here, the rolled plate cross-sectional shape analysis unit 25 first determines the entry side tension, the exit side tension, and the rolling load for each type of the rolled material S in each rolling mill 10 determined in step S4 (rolling schedule determination step). Is used to calculate the force acting on each working roll 11 of each rolling mill 10. Then, the rolled plate cross-sectional shape analysis unit 25 changes the offset amount L ₁₁ of the rolling mill 10 that offsets the working roll 11, that is, the working roll 11 of the final stand, and has a two-dimensional shape in the cross section perpendicular to the rolling direction. A plurality of roll plates perpendicular to the rolling direction are analyzed by considering not only the elastic deformation of each working roll 11 and the plastic deformation of the rolled material S but also the deformation of the working roll 11 of each rolling mill 10 in the rolling direction. The plate cross-sectional shape of the type of rolled material S is calculated.
As a result, a plate cross-sectional shape perpendicular to the rolling direction after rolling for each type of rolled material S can be obtained for each size of the offset amount L ₁₁ of the work roll 11 of the final stand.

Next, in step S6, the upper limit value setting unit 26 is set in step S2 (post-rolled rolled material setting step) of the plate cross-sectional shapes of the plurality of types of rolled materials S calculated in step S5 (rolled plate cross-sectional shape analysis step). The absolute value of the offset amount of the work roll 11 in which the amount of change that changes with respect to the plate cross-sectional shape based on the set plate thickness and plate width becomes the allowable value set in step S3 (allowable value setting step) is the rolled material. Calculated for each type of S. Then, the upper limit value setting unit 26 sets the absolute value of the smallest offset amount among the calculated absolute values of the offset amount of the work roll 11 for each type of the rolled material S as the upper limit value.
Finally, the information on the upper limit of the absolute value of the set offset amount is output to the output unit 27, and in step S7, the output unit 27 outputs the result.

As described above, according to the setting device 20 and the setting method of the upper limit value of the roll offset amount in the tandem rolling apparatus 1 according to the first embodiment, the mechanical properties, plate thickness and plate of the plurality of types of rolled materials S before rolling are obtained. The width is set (rolled material setting unit 21 before rolling, step S1), and the mechanical properties, plate thickness and plate width of a plurality of types of rolled materials after rolling are set (rolled material setting unit 22 after rolling, step S2). .. Then, the plate cross-sectional shape of a plurality of types of rolled materials perpendicular to the rolling direction after rolling changes with respect to the plate cross-sectional shape based on the plate thickness and plate width set in the post-rolled rolled material setting unit 22 (step S2). The permissible value of the amount of change is set for each type of the rolled material S (tolerance value setting unit 23, step S3), the mechanical properties, the plate thickness and the plate width of the plurality of types of rolled materials before rolling, and the plurality after rolling. Based on the mechanical properties, plate thickness and plate width of each type of rolled material, a rolling schedule including the entry side tension, the exit side tension and the rolling load in each rolling mill 10 is determined for each type of rolling material S ( Rolling schedule determination unit 24, step S4). Further, each work roll 11 of each rolling mill 10 is used by using the entry side tension, the exit side tension, and the rolling load for each type of rolling material in each rolling mill 10 determined by the rolling schedule determination unit 24 (step S4). The rolling plate cross section is calculated in consideration of the deformation of the working roll 11 of each rolling mill 10 in the rolling direction by variously changing the offset amount L of the working roll 11 of the rolling mill 10 to offset the working roll 11. The shape analysis is performed to calculate the plate cross-sectional shape of a plurality of types of rolled materials S perpendicular to the rolling direction (rolled plate cross-sectional shape analysis unit 25, step S5). Then, the plate thickness and plate width set in the post-rolled rolled material setting unit 22 (step S2) of the plate cross-sectional shapes of the plurality of types of rolled materials S calculated by the rolled plate cross-sectional shape analysis unit 25 (step S5). The absolute value of the offset amount of the work roll 11 in which the amount of change that changes with respect to the based plate cross-sectional shape becomes the allowable value set in the allowable value setting unit 23 (step S3) is calculated for each type of rolled material S. The absolute value of the smallest offset amount among the calculated absolute values of the offset amount of the working roll 11 for each type of rolled material S is set as the upper limit value (upper limit value setting unit 26, step S6).

As a result, in the tandem rolling mill 1, the upper limit of the absolute value of the offset amount L ₁₁ of the work roll 11 can be appropriately set.
Since the upper limit of the absolute value of the offset amount L of the work roll 11 can be appropriately set, the offset amount L ₁₁ of the work roll 11 can be optimally designed at the time of construction of the tandem rolling equipment 1.

Here, the offset amount L ₁₁ of the working roll 11 of each rolling mill 10 is also a liner installed on the sliding surface between the bearing box (not shown) of the working roll 11 and the rolling mill housing (not shown). Due to wear, it becomes larger with the use of the rolling mill 10. That is, even if the offset amount L ₁₁ is designed to the optimum size at the beginning of the construction of the tandem rolling equipment 1, the offset amount L exceeds the upper limit value set by the above-mentioned setting method after many years of use. There is. In that case, the liner may be replaced when the offset amount L ₁₁ reaches the upper limit value.

(Second Embodiment)
FIG. 4 shows a schematic configuration of an example of a tandem rolling apparatus to which the method for setting the upper limit of the roll offset amount according to the second embodiment of the present invention is applied. The tandem rolling apparatus 1 is a rolled material S. A rolling mill in which a plurality of rolling mills 10 (three in the present embodiment) for rolling the rolled material S unwound from the payoff reel 2 are arranged in the rolling direction of the rolled material S. A row 3 and a tension reel 4 for winding the rolled rolled material S are provided.
Unlike the tandem rolling equipment 1 shown in FIG. 1, each rolling mill 10 in the rolling mill row 3 is composed of a 6-stage rolling mill, and has a pair of upper and lower working rolls 11 for rolling the rolled material S and a pair of upper and lower working rolls. A pair of upper and lower reinforcing rolls 12 for reinforcing each of the eleven, and an upper and lower pair of working rolls 11 are arranged between each of the upper and lower pair of working rolls 11 and each of the upper and lower pair of reinforcing rolls 12 to reinforce each of the upper and lower pair of working rolls 11. It includes a pair of intermediate rolls 13.

The final stand in the rolling mill row 3 and the most downstream rolling mill 10 are different from the final stand shown in FIG. 1 and have a pair of upper and lower intermediate rolls 13 instead of the respective axial centers CL ₁₁ of the pair of upper and lower working rolls 11. are arranged to be offset by the offset amount L ₁₃ on the outlet side of the rolling direction of the rolled material S each axis CL ₁₃ for each axis CL ₁₂ of the pair of upper and lower rolls 12. Each axis CL ₁₁ of the pair of upper and lower work rolls 11 are not offset with respect to each axis CL ₁₂ of the pair of upper and lower rolls 12.
Here, in the second embodiment, the upper limit value of the offset amount L ₁₃ of each of the pair of upper and lower intermediate rolls 13 on the final stand is set before rolling the rolled material S.
The apparatus for setting the upper limit value of the roll offset amount in the tandem rolling equipment according to the second embodiment has a schematic configuration shown in FIG. 2 like the apparatus for setting the upper limit value of the roll offset amount in the tandem rolling equipment according to the first embodiment. Is equipped with.

That is, the roll-off set amount upper limit setting device 20 includes a pre-rolled rolled material setting unit 21, a post-rolled rolled material setting unit 22, an allowable value setting unit 23, a rolling schedule determination unit 24, and a rolled plate cross section. It includes a shape analysis unit 25, an upper limit value setting unit 26, and an output unit 27.
Here, the pre-rolled rolled material setting unit 21, the post-rolled rolled material setting unit 22, the allowable value setting unit 23, and the rolling schedule determination unit 24 are the upper limit values of the roll offset amount in the tandem rolling equipment according to the first embodiment. Since it has the same functions as the pre-rolling material setting unit 21, the post-rolling material setting unit 22, the permissible value setting unit 23, and the rolling schedule determination unit 24 of the setting device 20, the description thereof will be omitted.

On the other hand, the rolled plate cross-sectional shape analysis unit 25 uses the in-side tension, the out-side tension, and the rolling load for each type of the rolled material S in each rolling machine 10 determined by the rolling schedule determination unit 24 in each rolling mill. The force acting on each of the working rolls 11 and the intermediate rolls 13 of 10 is calculated, and the rolling mill 10 for offsetting the intermediate rolls 13, that is, the offset amount L ₁₃ of the intermediate rolls 13 of the final stand is variously changed to make each rolling mill 10 The rolling plate cross-sectional shape analysis is performed in consideration of the deformation of the working roll 11 and the intermediate roll 13 in the rolling direction, and the plate cross-sectional shapes of a plurality of types of rolled materials S perpendicular to the rolling direction are calculated.

Here, when calculating the force acting on each work roll 11 and intermediate roll 13 of each rolling mill 10, the entry side for each type of rolled material S in each rolling mill 10 determined by the rolling schedule determination unit 24. In addition to tension, output tension, and rolling load, the acceleration rate of the rolled material S and the magnitude of frictional resistance of the bearings of each work roll 11 are determined from the equipment specifications of the tandem rolling equipment 1 input from a higher-level computer (not shown). Consider the conditions as well.

Further, the upper limit value setting unit 26 is based on the plate thickness and plate width set by the rolled material setting unit 22 after rolling of the plate cross-sectional shapes of a plurality of types of rolled materials S calculated by the rolled plate cross-sectional shape analysis unit 25. The absolute value of the offset amount of the intermediate roll 13 in which the amount of change that changes with respect to the plate cross-sectional shape is the allowable value set by the allowable value setting unit 23 is calculated for each type of rolled material S. Then, the upper limit value setting unit 26 sets the absolute value of the smallest offset amount among the calculated absolute values of the offset amount of the intermediate roll 13 for each type of the rolled material S as the upper limit value.
Further, the output unit 27 outputs the upper limit value of the absolute value of the offset amount L ₁₃ of the intermediate roll 13 of the final stand set by the upper limit value setting unit 26.

Next, the processing flow in the device 20 for setting the upper limit value of the offset amount L ₁₃ of the intermediate roll 13 is the same as the flow of processing in the device 20 for setting the upper limit value of the offset amount L of the work roll 11 according to the first embodiment. It is shown in FIG.
First, in step S1, the pre-rolling material setting unit 21 sets the mechanical properties, plate thickness, and plate width of the plurality of types of rolled materials S before rolling (pre-rolling material setting step).
Next, in step S2, the post-rolled rolled material setting unit 22 sets the mechanical properties, plate thickness, and plate width of the plurality of types of rolled material S after rolling (post-rolled rolled material setting step).

Further, in step S3, the permissible value setting unit 23 determines the plate thickness and plate in which the plate cross-sectional shape of a plurality of types of rolled material S perpendicular to the rolling direction after rolling is set in step S2 (rolled material setting step after rolling). An allowable value of the amount of change that changes with respect to the cross-sectional shape of the plate based on the width is set for each type of the rolled material S (allowable value setting step).
Then, in step S4, the rolling schedule determination unit 24 determines the mechanical properties, plate thickness, and plate width of the plurality of types of rolled material S before rolling, which are set in step S1 (pre-rolling material setting step), and the step. Based on the mechanical properties, plate thickness and plate width of a plurality of types of rolled material S after rolling, which are set in S2 (rolled material setting step after rolling), the entry side tension and the exit side in each rolling mill 10 A rolling schedule including tension and rolling load is determined for each type of rolling material S (rolling schedule determination step).

Next, in step S5, the rolled plate cross-sectional shape analysis unit 25 performs a rolled plate cross-sectional shape analysis (rolled plate cross-sectional shape analysis step).
Here, the rolled plate cross-sectional shape analysis unit 25 first determines the entry side tension, the exit side tension, and the rolling load for each type of the rolled material S in each rolling mill 10 determined in step S4 (rolling schedule determination step). Is used to calculate the force acting on each working roll 11 and each intermediate roll 13 of each rolling mill 10. The rolled plate the cross-sectional shape analyzing unit 25, the rolling mill 10 causes the intermediate rolls 13 are offset, i.e. while changing the offset amount L ₁₃ of the final stand of the intermediate rolls 13, the two-dimensional in cross section perpendicular to the rolling direction The cross-sectional shape analysis of the rolled plate was carried out in consideration of not only the elastic deformation of each work roll 11 and the intermediate roll 13 and the plastic deformation of the rolled material S, but also the deformation of the work roll 11 and the intermediate roll 13 of each rolling mill 10 in the rolling direction. Then, the plate cross-sectional shapes of a plurality of types of rolled materials S perpendicular to the rolling direction are calculated.
As a result, a plate cross-sectional shape perpendicular to the rolling direction after rolling for each type of rolled material S can be obtained for each size of the offset amount L ₁₃ of the intermediate roll 13 of the final stand.

Next, in step S6, the upper limit value setting unit 26 is set in step S2 (post-rolled rolled material setting step) of the plate cross-sectional shapes of the plurality of types of rolled materials S calculated in step S5 (rolled plate cross-sectional shape analysis step). The absolute value of the offset amount of the intermediate roll 13 at which the amount of change that changes with respect to the plate cross-sectional shape based on the set plate thickness and plate width becomes the allowable value set in step S3 (allowable value setting step) is the rolled material. Calculated for each type of S. Then, the upper limit value setting unit 26 sets the absolute value of the smallest offset amount among the calculated absolute values of the offset amount of the intermediate roll 13 for each type of the rolled material S as the upper limit value.
Finally, the information on the upper limit of the absolute value of the set offset amount is output to the output unit 27, and in step S7, the output unit 27 outputs the result.

As described above, according to the setting device 20 and the setting method of the upper limit value of the roll offset amount in the tandem rolling apparatus 1 according to the second embodiment, the mechanical properties, plate thickness and plate of the plurality of types of rolled materials S before rolling are obtained. The width is set (rolled material setting unit 21 before rolling, step S1), and the mechanical properties, plate thickness and plate width of a plurality of types of rolled materials after rolling are set (rolled material setting unit 22 after rolling, step S2). .. Then, the plate cross-sectional shape of a plurality of types of rolled materials perpendicular to the rolling direction after rolling changes with respect to the plate cross-sectional shape based on the plate thickness and plate width set in the post-rolled rolled material setting unit 22 (step S2). The permissible value of the amount of change is set for each type of the rolled material S (tolerance value setting unit 23, step S3), the mechanical properties, the plate thickness and the plate width of the plurality of types of rolled materials before rolling, and the plurality after rolling. Based on the mechanical properties, plate thickness and plate width of each type of rolled material, a rolling schedule including the entry side tension, the exit side tension and the rolling load in each rolling mill 10 is determined for each type of rolling material S ( Rolling schedule determination unit 24, step S4). Further, each work roll 11 of each rolling mill 10 is used by using the entry side tension, the exit side tension, and the rolling load for each type of rolling material in each rolling mill 10 determined by the rolling schedule determination unit 24 (step S4). And the force acting on the intermediate roll 13 is calculated, and the offset amount L ₁₃ of the intermediate roll 13 of the rolling mill 10 that offsets the intermediate roll ₁₃ is variously changed to roll the working roll 11 and the intermediate roll 13 of each rolling mill 10. The rolled plate cross-sectional shape analysis in consideration of the deformation in the direction is performed to calculate the plate cross-sectional shape of a plurality of types of rolled materials S perpendicular to the rolling direction (rolled plate cross-sectional shape analysis unit 25, step S5). Then, the plate thickness and plate width set in the post-rolled rolled material setting unit 22 (step S2) of the plate cross-sectional shapes of the plurality of types of rolled materials S calculated by the rolled plate cross-sectional shape analysis unit 25 (step S5). The absolute value of the offset amount of the intermediate roll 13 in which the amount of change that changes with respect to the based plate cross-sectional shape becomes the allowable value set in the allowable value setting unit 23 (step S3) is calculated for each type of rolled material S. The absolute value of the smallest offset amount among the calculated absolute values of the offset amount of the intermediate roll 13 for each type of rolled material S is set as the upper limit value (upper limit value setting unit 26, step S6).

As a result, in the tandem rolling mill 1, the upper limit of the absolute value of the offset amount L ₁₃ of the intermediate roll 13 can be appropriately set.
Then, since the upper limit value of the offset amount L ₁₃ of the intermediate roll 13 can be appropriately set, the optimum design of the offset amount L ₁₃ of the intermediate roll 13 can be made at the time of construction of the tandem rolling equipment 1.
Further, even if the offset amount L ₁₃ is designed to the optimum size at the beginning of the construction of the tandem rolling equipment 1, the offset amount L ₁₃ exceeds the upper limit value set by the above-mentioned setting method after many years of use. Sometimes. In that case, the liner may be replaced when the offset amount L ₁₃ reaches the upper limit value.

(Third Embodiment)
FIG. 5 shows a schematic configuration of an example of a tandem rolling facility to which the method for setting the upper limit of the roll offset amount according to the third embodiment of the present invention is applied. The tandem rolling facility 1 is a rolled material S. A rolling mill in which a plurality of rolling mills 10 (three in the present embodiment) for rolling the rolled material S unwound from the payoff reel 2 are arranged in the rolling direction of the rolled material S. A row 3 and a tension reel 4 for winding the rolled rolled material S are provided.
Unlike the tandem rolling equipment 1 shown in FIG. 1, each rolling mill 10 in the rolling mill row 3 is composed of a 6-stage rolling mill, and has a pair of upper and lower working rolls 11 for rolling the rolled material S and a pair of upper and lower working rolls. A pair of upper and lower reinforcing rolls 12 for reinforcing each of the eleven, and an upper and lower pair of working rolls 11 are arranged between each of the upper and lower pair of working rolls 11 and each of the upper and lower pair of reinforcing rolls 12 to reinforce each of the upper and lower pair of working rolls 11. It includes a pair of intermediate rolls 13.

The final stand in the rolling mill train 3, the rolling mill 10 of the most downstream is rolled each axis CL ₁₁ of the pair of upper and lower work rolls 11 for each axis CL ₁₂ of the pair of upper and lower rolls 12 The offset amount L ₁₁ is offset on the exit side of S in the rolling direction, and unlike the tandem rolling mill 1 shown in FIG. 1, the axial center CL ₁₃ of each of the pair of upper and lower intermediate rolls ₁₃ is also placed on the upper and lower pair of reinforcing rolls 12. It is arranged so as to be offset by an offset amount L ₁₃ on the exit side of the rolled material S in the rolling direction with respect to each of the axial centers CL ₁₂ of the above.
Here, in the third embodiment, before rolling the rolled material S, the upper limit value of the offset amount L ₁₁ of each of the pair of upper and lower working rolls 11 on the final stand is set, and the upper and lower pairs are intermediate. The upper limit value of each offset amount L ₁₃ of the roll 13 is set.

The apparatus for setting the upper limit value of the roll offset amount in the tandem rolling equipment according to the third embodiment has a schematic configuration shown in FIG. 2 like the apparatus for setting the upper limit value of the roll offset amount in the tandem rolling equipment according to the first embodiment. Is equipped with.
That is, the roll offset amount upper limit setting device 20 includes the pre-rolled rolled material setting unit 21, the post-rolled rolled material setting unit 22, the allowable value setting unit 23, the rolling schedule determination unit 24, and the cross-sectional shape of the rolled plate. It includes an analysis unit 25, an upper limit value setting unit 26, and an output unit 27.
Here, the pre-rolled rolled material setting unit 21, the post-rolled rolled material setting unit 22, the allowable value setting unit 23, and the rolling schedule determination unit 24 are the upper limit values of the roll offset amount in the tandem rolling equipment according to the first embodiment. Since it has the same functions as the pre-rolling material setting unit 21, the post-rolling material setting unit 22, the permissible value setting unit 23, and the rolling schedule determination unit 24 of the setting device 20, the description thereof will be omitted.

On the other hand, the rolled plate cross-sectional shape analysis unit 25 uses the in-side tension, the out-side tension, and the rolling load for each type of the rolled material S in each rolling machine 10 determined by the rolling schedule determination unit 24 in each rolling mill. The force acting on each work roll 11 and intermediate roll 13 of 10 is calculated, and the rolling mill 10 that offsets the work roll 11 and intermediate roll 13, that is, the offset amount L ₁₁ of the work roll 11 of the final stand and the offset of the intermediate roll 13. The amount L ₁₃ was variously changed, and the rolling plate cross-sectional shape analysis was carried out in consideration of the deformation of the working roll 11 and the intermediate roll 13 of each rolling mill 10 in the rolling direction. Calculate the plate cross-sectional shape.
Here, when calculating the force acting on each work roll 11 and intermediate roll 13 of each rolling mill 10, the entry side for each type of rolled material S in each rolling mill 10 determined by the rolling schedule determination unit 24. In addition to tension, output tension, and rolling load, the acceleration rate of the rolled material S and the magnitude of frictional resistance of the bearings of each work roll 11 are determined from the equipment specifications of the tandem rolling equipment 1 input from a higher-level computer (not shown). Consider the conditions as well.

Further, the upper limit value setting unit 26 is based on the plate thickness and plate width set by the rolled material setting unit 22 after rolling of the plate cross-sectional shapes of a plurality of types of rolled materials S calculated by the rolled plate cross-sectional shape analysis unit 25. The type of rolled material S is the absolute value of the offset amount of the work roll 11 and the absolute value of the offset amount of the intermediate roll 13 in which the amount of change that changes with respect to the plate cross-sectional shape is the allowable value set by the allowable value setting unit 23. Calculated for each. Then, the upper limit value setting unit 26 sets the absolute value of the smallest offset amount among the calculated absolute values of the offset amount of the work roll 11 for each type of the rolled material S as the upper limit value of the offset amount of the work roll 11. At the same time, the absolute value of the smallest offset amount among the calculated absolute values of the offset amount of the intermediate roll 13 for each type of the rolled material S is set as the upper limit value of the offset amount of the intermediate roll 13.

Further, the output unit 27 sets the upper limit value of the absolute value of the offset amount L ₁₁ of the work roll 11 of the final stand and the upper limit value of the absolute value of the offset amount L ₁₃ of the intermediate roll 13 set by the upper limit value setting unit 26. Output.
Next, the processing flow in the device 20 for setting the upper limit value of the offset amount L ₁₁ of the work roll 11 and the upper limit value of the offset amount L ₁₃ of the intermediate roll 13 is the offset amount L of the work roll 11 according to the first embodiment. Similar to the processing flow in the upper limit setting device 20, it is shown in FIG.

First, in step S1, the pre-rolling material setting unit 21 sets the mechanical properties, plate thickness, and plate width of a plurality of types of rolled materials S before rolling (pre-rolling material setting step).
Next, in step S2, the post-rolled rolled material setting unit 22 sets the mechanical properties, plate thickness, and plate width of the plurality of types of rolled material S after rolling (post-rolled rolled material setting step).
Further, in step S3, the permissible value setting unit 23 determines the plate thickness and plate in which the plate cross-sectional shape of a plurality of types of rolled material S perpendicular to the rolling direction after rolling is set in step S2 (rolled material setting step after rolling). An allowable value of the amount of change that changes with respect to the cross-sectional shape of the plate based on the width is set for each type of the rolled material S (allowable value setting step).

Then, in step S4, the rolling schedule determination unit 24 determines the mechanical properties, plate thickness, and plate width of the plurality of types of rolled material S before rolling, which are set in step S1 (pre-rolling material setting step), and the step. Based on the mechanical properties, plate thickness and plate width of a plurality of types of rolled material S after rolling, which are set in S2 (rolled material setting step after rolling), the entry side tension and the exit side in each rolling mill 10 A rolling schedule including tension and rolling load is determined for each type of rolling material S (rolling schedule determination step).
Next, in step S5, the rolled plate cross-sectional shape analysis unit 25 performs a rolled plate cross-sectional shape analysis (rolled plate cross-sectional shape analysis step).

Here, the rolled plate cross-sectional shape analysis unit 25 first determines the entry side tension, the exit side tension, and the rolling load for each type of the rolled material S in each rolling mill 10 determined in step S4 (rolling schedule determination step). Is used to calculate the force acting on each working roll 11 and each intermediate roll 13 of each rolling mill 10. Then, the rolled plate cross-sectional shape analysis unit 25 changes the offset amount L ₁₁ of the work roll 11 of the final stand and the offset amount L ₁₃ of the intermediate roll 13, that is, the rolling mill 10 that offsets the work roll ₁₁ and the intermediate roll 13. Not only the elastic deformation of the two-dimensional working rolls 11 and the intermediate rolls 13 and the plastic deformation of the rolled material S in the cross section perpendicular to the rolling direction, but also the rolling directions of the working rolls 11 and the intermediate rolls 13 of each rolling mill 10. The rolling plate cross-sectional shape analysis is performed in consideration of the deformation of the above, and the plate cross-sectional shape of a plurality of types of rolled materials S perpendicular to the rolling direction is calculated.
As a result, a plate cross-sectional shape perpendicular to the rolling direction after rolling for each type of rolled material S can be obtained for each size of the offset amount L ₁₁ of the working roll 11 of the final stand and the offset amount L ₁₃ of the intermediate roll 13.

Next, in step S6, the upper limit value setting unit 26 is set in step S2 (post-rolled rolled material setting step) of the plate cross-sectional shapes of the plurality of types of rolled materials S calculated in step S5 (rolled plate cross-sectional shape analysis step). The absolute value of the offset amount of the working roll 11 and the intermediate roll in which the amount of change that changes with respect to the plate cross-sectional shape based on the set plate thickness and plate width becomes the allowable value set in step S3 (allowable value setting step). The absolute value of the offset amount of 13 is calculated for each type of rolled material S. Then, the upper limit value setting unit 26 sets the absolute value of the smallest offset amount among the calculated absolute values of the offset amount of the work roll 11 for each type of the rolled material S as the upper limit value of the offset amount of the work roll 11. At the same time, the absolute value of the smallest offset amount among the absolute values of the offset amount of the intermediate roll 13 is set as the upper limit value of the offset amount of the intermediate roll 13.
Finally, the information on the upper limit of the absolute value of the set offset amount is output to the output unit 27, and in step S7, the output unit 27 outputs the result.

As described above, according to the setting device 20 and the setting method of the upper limit value of the roll offset amount in the tandem rolling apparatus 1 according to the third embodiment, the mechanical properties, plate thickness and plate of the plurality of types of rolled materials S before rolling are obtained. The width is set (rolled material setting unit 21 before rolling, step S1), and the mechanical properties, plate thickness and plate width of a plurality of types of rolled materials after rolling are set (rolled material setting unit 22 after rolling, step S2). .. Then, the plate cross-sectional shape of a plurality of types of rolled materials perpendicular to the rolling direction after rolling changes with respect to the plate cross-sectional shape based on the plate thickness and plate width set in the post-rolled rolled material setting unit 22 (step S2). The permissible value of the amount of change is set for each type of the rolled material S (tolerance value setting unit 23, step S3), the mechanical properties, the plate thickness and the plate width of the plurality of types of rolled materials before rolling, and the plurality after rolling. Based on the mechanical properties, plate thickness and plate width of each type of rolled material, a rolling schedule including the entry side tension, the exit side tension and the rolling load in each rolling mill 10 is determined for each type of rolling material S ( Rolling schedule determination unit 24, step S4). Further, each work roll 11 of each rolling mill 10 is used by using the entry side tension, the exit side tension, and the rolling load for each type of rolling material in each rolling mill 10 determined by the rolling schedule determination unit 24 (step S4). The force acting on the intermediate roll 13 is calculated, and the offset amount L ₁₁ of the working roll 11 of the rolling mill 10 and the offset amount L ₁₃ of the intermediate roll 13 for offsetting the working roll ₁₁ and the intermediate roll ₁₃ are variously changed. A rolled plate cross-sectional shape analysis is performed in consideration of deformation of the working roll 11 and the intermediate roll 13 of the rolling mill 10 in the rolling direction, and the plate cross-sectional shape of a plurality of types of rolled materials S perpendicular to the rolling direction is calculated (rolled plate cross section). Shape analysis unit 25, step S5). Then, the plate thickness and plate width set in the post-rolled rolled material setting unit 22 (step S2) of the plate cross-sectional shapes of the plurality of types of rolled materials S calculated by the rolled plate cross-sectional shape analysis unit 25 (step S5). The absolute value of the offset amount of the working roll 11 and the absolute value of the offset amount of the intermediate roll 13 are the allowable values set by the allowable value setting unit 23 (step S3). Calculated for each type of rolled material S, and the absolute value of the smallest offset amount among the calculated absolute values of the offset amount of the work roll 11 for each type of rolled material S is set as the upper limit value of the offset amount of the work roll 11. At the same time, the absolute value of the smallest offset amount among the calculated absolute values of the offset amount of the intermediate roll 13 for each type of the rolled material S is set as the upper limit value of the offset amount of the intermediate roll 13 (upper limit value setting unit 26). , Step S6).

Thereby, in the tandem rolling apparatus 1, the upper limit value of the absolute value of the offset amount L ₁₁ of the working roll 11 and the upper limit value of the absolute value of the offset amount L ₁₃ of the intermediate roll 13 can be appropriately set.
Since the upper limit of the offset amount L ₁₁ of the work roll 11 and the upper limit of the offset amount L ₁₃ of the intermediate roll 13 can be appropriately set, the offset amount L _{11 of the} work roll 11 is set when the tandem rolling equipment 1 is constructed. And the offset amount L ₁₃ of the intermediate roll 13 can be optimally designed.
Further, even if the offset amounts L ₁₁ and L ₁₃ are designed to the optimum size at the beginning of the construction of the tandem rolling facility 1, the offset amounts L ₁₁ and L ₁₃ are set by the above-mentioned setting method after many years of use. It may exceed the upper limit. In that case, the liner may be replaced when the offset amounts L ₁₁ and L ₁₃ reach the upper limit value.

Although the embodiments of the present invention have been described above, the present invention is not limited to this, and various modifications and improvements can be made.
For example, in the first to third embodiments, the case where there are a plurality of types of rolling materials S to be rolled by the tandem rolling equipment 1 is described, but there is only one type of rolling material S to be rolled by the tandem rolling equipment 1. The present invention can also be applied in the case of.

In this case, each rolling mill 10 and 4-high rolling mill, the rolling direction of the rolled material S with respect to the axis CL ₁₂ of rolls 12 at least one of 4-high rolling mill is the axis CL ₁₁ of the work roll 11 In the case of tandem rolling equipment 1 offset on the entry side or the exit side, the mechanical properties, plate thickness and plate width of the rolled material S before rolling are set (rolled material setting unit 21 before rolling). , Step S1), the mechanical properties, plate thickness and plate width of the rolled material S after rolling are set (rolled material setting unit after rolling 22, step S2), and the plate of the rolled material S perpendicular to the rolling direction after rolling. The permissible value of the amount of change in which the cross-sectional shape changes with respect to the plate cross-sectional shape based on the plate thickness and plate width set in the rolled material setting unit 22 (step S2) after rolling is set (allowable value setting unit 23, step S3). ), The mechanical properties, plate thickness and width of the rolled material S before rolling, which are set in the pre-rolled material setting unit 21 (step S1), and the post-rolled material setting unit 22 (step S2). In addition, based on the mechanical properties, plate thickness, and plate width of the rolled material S after rolling, the rolling schedule including the entry side tension, the exit side tension, and the rolling load in each rolling mill 10 is determined (rolling schedule determination). Part 24, step S4). Then, the force acting on each work roll 11 of each rolling mill 10 is calculated using the entry side tension, the exit side tension, and the rolling load of each rolling mill 10 determined by the rolling schedule determination unit 24 (step S4). At the same time, the offset amount of the work roll 11 of the rolling mill 10 that offsets the work roll 11 is variously changed, and the rolling plate cross-sectional shape analysis is carried out in consideration of the deformation of the work roll 11 of each rolling mill 10 in the rolling direction. The plate cross-sectional shape of the rolled material perpendicular to the direction is calculated (rolled plate cross-sectional shape analysis unit 25, step S5), and the plate cross-sectional shape of the rolled material S calculated by the rolled plate cross-sectional shape analysis unit 25 (step S5). The amount of change that changes with respect to the plate cross-sectional shape based on the plate thickness and plate width set in the rolled material setting unit 22 (step S2) after rolling is the allowable value set in the allowable value setting unit 23 (step S3). The offset amount of the work roll 11 is set as the upper limit value (upper limit value setting unit 26, step S6).

Further, when the rolling material S is of a single type, each rolling mill 10 is a 6-stage rolling mill, and at least one rolling mill 10 replaces the axis CL ₁₁ of the working roll 11 with the shaft of the intermediate roll 13. When the core CL ₁₃ is a tandem rolling facility 1 offset on the entry side or the exit side with respect to the rolling direction of the rolled material S with respect to the axial center CL ₁₂ of the reinforcing roll 12, the above-mentioned rolled plate cross-sectional shape In the analysis unit 15 (step S5), each work roll of each rolling mill 10 is used by the entry side tension, the exit side tension, and the rolling load of each rolling mill 10 determined by the rolling schedule determination unit 24 (step S4). The force acting on the 11 and the intermediate roll 13 is calculated, and the offset amount of the intermediate roll 13 of the rolling mill 10 for offsetting the intermediate roll 13 is variously changed to roll the working roll 11 and the intermediate roll 13 of each rolling mill 10. The rolled plate cross-sectional shape analysis is performed in consideration of the deformation of the rolled plate, and the plate cross-sectional shape of the rolled material perpendicular to the rolling direction is calculated. In the upper limit value setting unit 26 (step S6), the rolled plate cross-sectional shape analysis unit 25 (step S5) ), The amount of change in the plate cross-sectional shape of the rolled material S based on the plate thickness and plate width set in the rolled material setting unit 22 (step S2) after rolling is an allowable value. The offset amount of the intermediate roll 13 which is the allowable value set in the setting unit 23 (step S3) is set as the upper limit value.

Further, when the rolling material S is of a single type, each rolling mill 10 is a 6-stage rolling mill, and at least one rolling mill 10 has the axial center CL ₁₁ of the working roll 11 and the axial center CL of the intermediate roll 13. _When the tandem rolling equipment 1 is arranged offset to the entry side or the exit side with respect to the rolling direction of the rolled material S with respect to the axial center CL ₁₂ of the reinforcing roll 12, the above-mentioned rolled plate cross-sectional shape analysis unit In 15 (step S5), each work roll 11 and each working roll 11 of each rolling mill 10 and the rolling load are used for the entry side tension, the exit side tension, and the rolling load in each rolling mill 10 determined by the rolling schedule determination unit 24 (step S4). The force acting on the intermediate roll 13 is calculated, and the offset amount of the work roll 11 and the offset amount of the intermediate roll 13 of the rolling mill 10 for offsetting the work roll 11 and the intermediate roll 13 are variously changed to perform the work of each rolling mill 10. A rolled plate cross-sectional shape analysis is performed in consideration of deformation of the roll 11 and the intermediate roll 13 in the rolling direction, and the plate cross-sectional shape of the rolled material perpendicular to the rolling direction is calculated. Then, in the upper limit value setting unit 26 (step S6), the sheet cross-sectional shape of the rolled material S calculated by the rolled plate cross-sectional shape analysis unit 25 (step S5) is set by the rolled material setting unit 22 (step S2) after rolling. The absolute value of the offset amount of the working roll 11 and the intermediate roll in which the amount of change that changes with respect to the plate cross-sectional shape based on the plate thickness and the plate width becomes the allowable value set by the allowable value setting unit 23 (step S3). The absolute value of the offset amount of 13 is set as the upper limit value of the offset amount of the working roll 11 and the upper limit value of the offset amount of the intermediate roll 13.

In the first embodiment, the final stand are arranged offset on the outlet side to the rolling direction of the rolled material S to the axis CL ₁₁ of the work roll 11 with respect to the axis CL ₁₂ of rolls 12 However, it may be offset on the entry side. Further, the stand for offsetting the work rolls 11 may be a stand other than the final stand, and the work rolls 11 of at least one stand may be offset on the entry side or the exit side.
In the second embodiment, the final stand are arranged offset on the outlet side to the rolling direction of the rolled material S to the axis CL ₁₃ of the intermediate rolls 13 with respect to the axis CL ₁₂ of rolls 12 However, it may be offset on the entry side. Further, the stand for offsetting the intermediate rolls 13 may be a stand other than the final stand, and the intermediate rolls 13 of at least one stand may be offset on the entry side or the exit side.

Further, in the third embodiment, the final stand, to the rolling direction of the rolled material S to the axis _{CL 13} of the axis _{CL 11} and intermediate roll 13 of work roll 11 with respect to the axis _{CL 12} of rolls 12 Although it is offset on the exit side, it may be offset on the entry side. Further, the stand for offsetting the work roll 11 and the intermediate roll 13 may be a stand other than the final stand, and the work roll 11 and the intermediate roll 13 of at least one stand are offset on the entry side or the exit side. You can do it like this.

As an example, the upper limit of the offset amount L of the intermediate roll 13 of the final stand in the tandem rolling mill 1 shown in FIG. 4 was set by using the upper limit setting device 20 of the roll offset amount shown in FIG.
In this embodiment, the rolled material S is set to two types, high-tensile steel and mild steel, and the plate thickness before rolling is 2.4 mm, the plate width is 1400 mm, the plate thickness after rolling is 1.4 mm, and the plate width is 1400 mm. did.
Further, the permissible amount of change in the plate cross-sectional shape of the two types of rolled material S perpendicular to the rolling direction after rolling with respect to the plate cross-sectional shape based on the plate thickness after rolling: 1.4 mm and the plate width: 1400 mm. As a result, it was decided that the plate thickness of both types of rolled material S at a position 20 mm from the end in the width direction was not reduced by 30 μm with respect to the plate thickness at the center of the plate width.

Further, the mechanical properties of the two types of rolled material S before rolling, the plate thickness: 2.4 mm and the plate width: 1400 mm, and the mechanical properties of the two types of rolled material S after rolling, the plate thickness 1.4 mm and the plate. Based on the width: 1400 mm, a rolling schedule including the inlet tension, the outlet tension and the rolling load in each rolling mill 10 was determined for each type of rolling material S. Regarding the final stand of the determined rolling schedule, for high-tensile steel, entry side tension: 56 tonf, exit side tension: 40 tonf, rolling load: 2000 tonf, for mild steel, entry side tension: 42 tonf, output side tension: 40 tonf, rolling load: 1400 tonf. It was.

Then, the force acting on each working roll 11 and the intermediate roll 13 of each rolling mill 10 is calculated using the input side tension, the exit side tension, and the rolling load of the two types of rolled materials S in each of the determined rolling mills 10. At the same time, the rolling machine 10 that offsets the intermediate roll 13, that is, the offset amount L of the intermediate roll 13 of the final stand is changed from 0 mm to 8 mm in 1 mm increments to roll the working roll 11 and the intermediate roll 13 of each rolling mill 10. A cross-sectional shape analysis of the rolled plate was carried out in consideration of the deformation in the direction.
Then, the offset amount of the intermediate roll 13 is taken on the horizontal axis, and the difference between the plate thickness at the center of the plate width and the plate thickness at the end in the plate width direction obtained from the cross-sectional shape analysis of the rolled plate is taken on the vertical axis, and the rolled material is taken. FIG. 6 shows the relationship between the difference between the plate thickness at the center of the plate width and the plate thickness at the end in the plate width direction when rolling a high-tensile steel as S and the offset amount of the intermediate roll, and mild steel is used as the rolled material S. FIG. 7 shows the relationship between the difference between the plate thickness at the center of the plate width and the plate thickness at the end in the plate width direction during rolling and the offset amount of the intermediate roll.

Then, the amount of change in the plate cross-sectional shape of the two types of rolled material S perpendicular to the rolling direction after the rolled plate cross-sectional shape analysis with respect to the plate cross-sectional shape based on the set plate thickness and plate width is described above. The offset amount of the intermediate roll 13, which is an allowable value, is calculated for each type of rolled material.
Specifically, the intermediate roll 13 in which the difference between the plate thickness at the center of the plate width and the plate thickness at the end in the plate width direction obtained from the analysis of the cross-sectional shape of the rolled plate when the rolled material S is a high-tensile material is 30 μm. Offset amount of the intermediate roll 13 and the difference between the plate thickness at the center of the plate width and the plate thickness at the end in the plate width direction obtained from the analysis of the cross-sectional shape of the rolled plate when the rolled material S is mild steel is 30 μm. Calculate the amount. With reference to FIGS. 5 and 6, the offset amount of the intermediate roll 13 when the rolled material S is a high-tensile material is 3 mm in absolute value, and the offset amount of the intermediate roll 13 when the rolled material S is mild steel is 7 mm in absolute value. Become.

Then, the smallest absolute value of the offset amount of 3 mm among the calculated absolute values of the offset amounts of the two types of rolled materials S is set as the upper limit value of the intermediate roll 13 of the final stand.
As a result, when two types of rolled materials S are rolled, the difference between the plate thickness at the center of the plate width and the plate thickness at the end in the plate width direction can be suppressed within 30 μm (within the allowable value of the amount of deformation). ..

1 Tandem rolling equipment 2 Payoff reel 3 Rolling machine row 4 Tension reel 10 Rolling machine 11 Work roll 12 Reinforcing roll 13 Intermediate roll 20 Roll offset amount upper limit setting device 21 Pre-rolling material setting unit 22 Post-rolling rolling material setting unit 23 Allowable value setting unit 24 Rolling schedule determination unit 25 Rolled plate cross-sectional shape analysis unit 26 Upper limit value setting unit 27 Output unit S Rolled material

Claims (12)

It has a rolling mill row in which a plurality of rolling mills having a pair of upper and lower working rolls and a pair of upper and lower reinforcing rolls for reinforcing each of the upper and lower working rolls are arranged in the rolling direction of the rolled material. The upper limit of the amount of roll offset in a tandem rolling facility in which one rolling mill offsets the axis of the work roll on the entry side or the exit side with respect to the axis of the reinforcing roll with respect to the rolling direction of the rolled material. It is a setting method of
Pre-rolling material setting step to set the mechanical properties, plate thickness and plate width of the rolled material before rolling,
A post-rolled rolled material setting step for setting the mechanical properties, plate thickness and plate width of the rolled material after rolling,
Allowance to set the permissible amount of change in the plate cross-sectional shape of the rolled material perpendicular to the rolling direction after rolling with respect to the plate cross-sectional shape based on the plate thickness and plate width set in the post-rolled rolled material setting step. Value setting steps and
The mechanical properties, plate thickness and plate width of the rolled material before rolling set in the pre-rolled rolled material setting step, and the mechanical properties of the rolled material after rolling set in the post-rolled rolled material setting step. A rolling schedule determination step that determines a rolling schedule including entry side tension, exit side tension and rolling load at each rolling mill based on the plate thickness and plate width.
A rolling mill that calculates the force acting on each working roll of each rolling mill using the entry side tension, exit side tension, and rolling load of each rolling mill determined in the rolling schedule determination step, and offsets the working roll. Rolling to calculate the plate cross-sectional shape of the rolled material perpendicular to the rolling direction by performing the rolled plate cross-sectional shape analysis considering the deformation of the rolling direction of the working roll of each rolling mill by variously changing the offset amount of the work roll of Plate cross-sectional shape analysis step and
The amount of change in the plate cross-sectional shape of the rolled material calculated by the rolled plate cross-sectional shape analysis step with respect to the plate cross-sectional shape based on the plate thickness and plate width set in the post-rolled rolled material setting step is The upper limit of the roll offset amount in the tandem rolling mill, which includes the upper limit value setting step of setting the absolute value of the offset amount of the working roll which is the allowable value set in the allowable value setting step as the upper limit value. How to set. Each rolling mill in the tandem rolling mill is arranged between each of the pair of upper and lower working rolls and each of the pair of upper and lower reinforcing rolls, and a pair of upper and lower intermediate rolls for reinforcing each of the pair of upper and lower working rolls. At least one rolling mill offsets the axis of the intermediate roll with respect to the axis of the reinforcing roll on the entry side or the exit side with respect to the rolling direction of the rolled material instead of the axis of the work roll. Have been placed and
In the rolled plate cross-sectional shape analysis step, the force acting on each working roll and intermediate roll of each rolling mill using the input side tension, the exit side tension, and the rolling load in each rolling mill determined in the rolling schedule determination step. In addition to calculating, the offset amount of the intermediate roll of the rolling mill that offsets the intermediate roll is variously changed, and the rolling plate cross-sectional shape analysis is carried out in consideration of the deformation of the working roll of each rolling mill and the rolling direction of the intermediate roll. Calculate the plate cross-sectional shape of the rolled material perpendicular to the rolling direction,
In the upper limit value setting step, the plate cross-sectional shape calculated by the rolled plate cross-sectional shape analysis step changes with respect to the plate cross-sectional shape based on the plate thickness and plate width set in the post-rolled rolled material setting step. The roll offset amount in the tandem rolling apparatus according to claim 1, wherein the amount of change is set with the absolute value of the offset amount of the intermediate roll, which is the allowable value set in the allowable value setting step, as an upper limit value. How to set the upper limit of. Each rolling mill in the tandem rolling mill is arranged between each of the pair of upper and lower working rolls and each of the pair of upper and lower reinforcing rolls, and a pair of upper and lower intermediate rolls for reinforcing each of the pair of upper and lower working rolls. At least one rolling mill is arranged so that the axis of the intermediate roll is offset with respect to the axis of the reinforcing roll on the entry side or the exit side with respect to the rolling direction of the rolled material together with the axis of the work roll. And
In the rolled plate cross-sectional shape analysis step, the force acting on each working roll and intermediate roll of each rolling mill using the input side tension, the exit side tension, and the rolling load in each rolling mill determined in the rolling schedule determination step. The amount of offset of the working roll and the amount of offset of the intermediate roll of the rolling mill that offsets the working roll and the intermediate roll were variously changed, and the deformation of the working roll and the intermediate roll of each rolling mill in the rolling direction was also taken into consideration. Analyze the cross-sectional shape of the rolled plate to calculate the cross-sectional shape of the rolled material perpendicular to the rolling direction.
In the upper limit value setting step, the plate cross-sectional shape of the rolled material calculated by the rolled plate cross-sectional shape analysis step is based on the plate thickness and plate width set in the post-rolled rolled material setting step. The absolute value of the offset amount of the working roll and the absolute value of the offset amount of the intermediate roll, which are the allowable values set in the tolerance setting step, are the upper limit value of the offset amount of the working roll and the intermediate roll. The method for setting the upper limit value of the roll offset amount in the tandem rolling mill according to claim 1, wherein the upper limit value of the offset amount is set. It has a row of rolling mills in which a plurality of rolling mills having a pair of upper and lower working rolls and a pair of upper and lower reinforcing rolls for reinforcing each of the upper and lower working rolls are arranged in the rolling direction of the rolled material, and at least. The upper limit of the amount of roll offset in a tandem rolling mill in which one rolling mill offsets the axis of the working roll on the entry side or the exit side with respect to the axis of the reinforcing roll in the rolling direction of the rolled material. Is the setting method of
Pre-rolling material setting steps to set the mechanical properties, plate thickness and plate width of multiple types of rolled material before rolling,
A post-rolled rolled material setting step that sets the mechanical properties, plate thickness and plate width of multiple types of rolled material after rolling,
Allowable amount of change in the plate cross-sectional shape of a plurality of types of rolled materials perpendicular to the rolling direction after rolling with respect to the plate cross-sectional shape based on the plate thickness and plate width set in the post-rolling rolled material setting step. Tolerance setting steps to be set for each type of rolled material,
The mechanical properties, plate thickness and plate width of the plurality of types of rolled materials before rolling set in the pre-rolling material setting step, and the plurality of types after rolling set in the post-rolling material setting step. With the rolling schedule determination step of determining the rolling schedule including the entry side tension, the exit side tension and the rolling load in each rolling mill based on the mechanical properties, the plate thickness and the plate width of the rolled material for each type of the rolled material. ,
The force acting on each work roll for each type of rolled material of each rolling mill using the inlet tension, the exit side tension, and the rolling load for each type of rolled material in each rolling machine determined in the rolling schedule determination step. The offset amount of the work roll of the rolling mill that offsets the work roll is variously changed, and the cross-sectional shape analysis of the rolled plate for each type of rolled material is performed in consideration of the deformation of the work roll of each rolling mill in the rolling direction. A rolled plate cross-sectional shape analysis step for calculating the plate cross-sectional shape of multiple types of rolled materials perpendicular to the rolling direction,
Changes in the plate cross-sectional shape of the plurality of types of rolled materials calculated by the rolled plate cross-sectional shape analysis step with respect to the plate cross-sectional shape based on the plate thickness and plate width set in the post-rolled rolled material setting step. The absolute value of the offset amount of the work roll whose amount is the permissible value set in the permissible value setting step is calculated for each type of rolled material, and the calculated offset amount of the work roll for each type of rolled material is calculated. A method for setting an upper limit value of a roll offset amount in a tandem rolling mill, which comprises an upper limit value setting step of setting the absolute value of the smallest offset amount among the absolute values as an upper limit value. Each rolling mill in the tandem rolling mill is arranged between each of the pair of upper and lower working rolls and each of the pair of upper and lower reinforcing rolls, and a pair of upper and lower intermediate rolls for reinforcing each of the pair of upper and lower working rolls. At least one rolling mill offsets the axis of the intermediate roll with respect to the axis of the reinforcing roll on the entry side or the exit side with respect to the rolling direction of the rolled material instead of the axis of the work roll. Have been placed and
In the rolled plate cross-sectional shape analysis step, each working roll of each rolling mill is used with the inlet tension, the outlet tension, and the rolling load for each type of rolled material in each rolling mill determined in the rolling schedule determination step. And the rolling plate cross section in consideration of the deformation of the working roll of each rolling mill and the rolling direction of the intermediate roll by calculating the force acting on the intermediate roll and changing the offset amount of the intermediate roll of the rolling mill that offsets the intermediate roll. Perform shape analysis to calculate the plate cross-sectional shape of multiple types of rolled materials perpendicular to the rolling direction.
In the upper limit value setting step, a plate cross section based on the plate thickness and plate width of the plate cross-sectional shapes of the plurality of types of rolled materials calculated in the rolled plate cross-section shape analysis step and set in the post-rolled rolled material setting step. The absolute value of the offset amount of the intermediate roll, which is the permissible value set in the permissible value setting step, is calculated for each type of rolled material, and the calculated amount of change with respect to the shape is calculated for each type of rolled material. The method for setting the upper limit of the roll offset amount in the tandem rolling mill according to claim 4, wherein the absolute value of the smallest offset amount among the absolute values of the offset amounts of the intermediate rolls is set as the upper limit value. Each rolling mill in the tandem rolling mill is arranged between each of the pair of upper and lower working rolls and each of the pair of upper and lower reinforcing rolls, and a pair of upper and lower intermediate rolls for reinforcing each of the pair of upper and lower working rolls. At least one rolling mill is arranged so that the axis of the intermediate roll is offset with respect to the axis of the reinforcing roll on the entry side or the exit side with respect to the rolling direction of the rolled material together with the axis of the work roll. And
In the rolled plate cross-sectional shape analysis step, each working roll of each rolling mill is used with the inlet tension, the outlet tension, and the rolling load for each type of rolled material in each rolling mill determined in the rolling schedule determination step. And the force acting on the intermediate roll is calculated, and the offset amount of the working roll and the offset amount of the intermediate roll of the rolling mill that offsets the working roll and the intermediate roll are variously changed to roll the working roll and the intermediate roll of each rolling mill. The cross-sectional shape of the rolled plate was analyzed in consideration of the deformation in the direction, and the cross-sectional shapes of the rolled plates perpendicular to the rolling direction were calculated.
In the upper limit value setting step, a plate cross section based on the plate thickness and plate width of the plate cross-sectional shapes of the plurality of types of rolled materials calculated in the rolled plate cross-sectional shape analysis step and set in the post-rolled rolled material setting step. The absolute value of the offset amount of the working roll and the absolute value of the offset amount of the intermediate roll, which are the permissible values set in the permissible value setting step for the change amount changing with respect to the shape, are calculated for each type of rolled material. , The absolute value of the smallest offset amount among the calculated absolute values of the offset amount of the working roll for each type of rolled material is set as the upper limit of the offset amount of the working roll, and for each type of rolled material calculated. The upper limit of the roll offset amount in the tandem rolling mill according to claim 4, wherein the smallest absolute value of the offset amount of the intermediate roll is set as the upper limit value of the offset amount of the intermediate roll. How to set. It has a row of rolling mills in which a plurality of rolling mills having a pair of upper and lower working rolls and a pair of upper and lower reinforcing rolls for reinforcing each of the upper and lower working rolls are arranged in the rolling direction of the rolled material, and at least. The upper limit of the amount of roll offset in a tandem rolling mill in which one rolling mill offsets the axis of the working roll on the entry side or the exit side with respect to the axis of the reinforcing roll in the rolling direction of the rolled material. It is a setting device of
A pre-rolled rolled material setting unit that sets the mechanical properties, plate thickness and plate width of the rolled material before rolling,
A post-rolled rolled material setting unit that sets the mechanical properties, plate thickness and plate width of the rolled material after rolling,
Allowance to set the allowable value of the amount of change in the plate cross-sectional shape of the rolled material perpendicular to the rolling direction after rolling with respect to the plate cross-sectional shape based on the plate thickness and plate width set in the post-rolled rolled material setting unit. Value setting part and
The mechanical properties, plate thickness and plate width of the rolled material before rolling set by the pre-rolled rolled material setting unit and the mechanical properties of the rolled material after rolling set by the post-rolled rolled material setting unit. , A rolling schedule determination unit that determines a rolling schedule including the entry side tension, the exit side tension, and the rolling load in each rolling mill based on the plate thickness and the plate width.
A rolling mill that calculates the force acting on each work roll of each rolling mill using the entry side tension, exit side tension, and rolling load of each rolling mill determined by the rolling schedule determination unit, and offsets the work roll. Rolling to calculate the plate cross-sectional shape of the rolled material perpendicular to the rolling direction by performing the rolling plate cross-sectional shape analysis considering the deformation of the rolling direction of the working roll of each rolling mill by variously changing the offset amount of the work roll of Plate cross-section shape analysis unit and
The amount of change in the plate cross-sectional shape of the rolled material calculated by the rolled plate cross-sectional shape analysis unit with respect to the plate cross-sectional shape based on the plate thickness and plate width set by the rolled material setting unit after rolling is An upper limit value of the roll offset amount in the tandem rolling equipment, which comprises an upper limit value setting unit for setting an absolute value of the offset amount of the working roll which is the allowable value set by the allowable value setting unit as an upper limit value. Setting device. Each rolling mill in the tandem rolling mill is arranged between each of the pair of upper and lower working rolls and each of the pair of upper and lower reinforcing rolls, and a pair of upper and lower intermediate rolls for reinforcing each of the pair of upper and lower working rolls. At least one rolling mill offsets the axis of the intermediate roll with respect to the axis of the reinforcing roll on the entry side or the exit side with respect to the rolling direction of the rolled material instead of the axis of the work roll. Have been placed and
The rolled plate cross-sectional shape analysis unit uses the input side tension, the exit side tension, and the rolling load of each rolling mill determined by the rolling schedule determination unit to act on each working roll and intermediate roll of each rolling mill. In addition to calculating, the offset amount of the intermediate roll of the rolling mill that offsets the intermediate roll is variously changed, and the rolling plate cross-sectional shape analysis is carried out in consideration of the deformation of the working roll of each rolling mill and the rolling direction of the intermediate roll. Calculate the plate cross-sectional shape of the rolled material perpendicular to the rolling direction,
The upper limit value setting unit refers to the plate cross-sectional shape of the rolled material calculated by the rolled plate cross-sectional shape analysis unit based on the plate thickness and plate width set by the rolled material setting unit after rolling. The tandem rolling apparatus according to claim 7, wherein the change amount is set with the absolute value of the offset amount of the intermediate roll, which is the allowable value set by the allowable value setting unit, as an upper limit value. A device for setting the upper limit of the roll offset amount. Each rolling mill in the tandem rolling mill is arranged between each of the pair of upper and lower working rolls and each of the pair of upper and lower reinforcing rolls, and a pair of upper and lower intermediate rolls for reinforcing each of the pair of upper and lower working rolls. At least one rolling mill is arranged so that the axis of the intermediate roll is offset with respect to the axis of the reinforcing roll on the entry side or the exit side with respect to the rolling direction of the rolled material together with the axis of the work roll. And
The rolled plate cross-sectional shape analysis unit uses the input side tension, the exit side tension, and the rolling load of each rolling mill determined by the rolling schedule determination unit to act on each working roll and intermediate roll of each rolling mill. The amount of offset of the working roll and the amount of offset of the intermediate roll of the rolling mill that offsets the working roll and the intermediate roll were variously changed, and the deformation of the working roll and the intermediate roll of each rolling mill in the rolling direction was also taken into consideration. Analyze the cross-sectional shape of the rolled plate to calculate the cross-sectional shape of the rolled material perpendicular to the rolling direction.
The upper limit value setting unit refers to the plate cross-sectional shape of the rolled material calculated by the rolled plate cross-sectional shape analysis unit, based on the plate thickness and plate width set by the rolled material setting unit after rolling. The absolute value of the offset amount of the work roll and the absolute value of the offset amount of the intermediate roll, which are the permissible values set by the permissible value setting unit, are set as the upper limit value of the offset amount of the work roll and the intermediate roll. The apparatus for setting the upper limit value of the roll offset amount in the tandem rolling mill according to claim 7, wherein the upper limit value of the offset amount is set. It has a row of rolling mills in which a plurality of rolling mills having a pair of upper and lower working rolls and a pair of upper and lower reinforcing rolls for reinforcing each of the upper and lower working rolls are arranged in the rolling direction of the rolled material, and at least. The upper limit of the amount of roll offset in a tandem rolling mill in which one rolling mill offsets the axis of the working roll on the entry side or the exit side with respect to the axis of the reinforcing roll in the rolling direction of the rolled material. It is a setting device of
A pre-rolling material setting unit that sets the mechanical properties, plate thickness and plate width of multiple types of rolled material before rolling,
A post-rolled rolled material setting unit that sets the mechanical properties, plate thickness, and plate width of multiple types of rolled material after rolling,
Allowable amount of change in the plate cross-sectional shape of a plurality of types of rolled materials perpendicular to the rolling direction after rolling with respect to the plate cross-sectional shape based on the plate thickness and plate width set in the post-rolled rolled material setting unit. Allowable value setting unit set for each type of rolled material,
The mechanical properties, plate thickness and plate width of the plurality of types of rolled materials before rolling set in the pre-rolled rolled material setting unit, and the plurality of types after rolling set in the post-rolled rolled material setting unit. With a rolling schedule determination unit that determines a rolling schedule including input side tension, exit side tension and rolling load at each rolling mill based on the mechanical properties, plate thickness and plate width of the rolled material for each type of rolled material. ,
The force acting on each work roll for each type of rolled material of each rolling mill using the inlet tension, the exit side tension, and the rolling load for each type of rolled material in each rolling machine determined by the rolling schedule determination unit. The offset amount of the work roll of the rolling mill that offsets the work roll is variously changed, and the cross-sectional shape analysis of the rolled plate for each type of rolled material is performed in consideration of the deformation of the work roll of each rolling mill in the rolling direction. A rolled plate cross-sectional shape analysis unit that calculates the plate cross-sectional shape of multiple types of rolled materials that are perpendicular to the rolling direction.
Changes in the plate cross-sectional shape of the plurality of types of rolled materials calculated by the rolled plate cross-sectional shape analysis unit with respect to the plate cross-sectional shape based on the plate thickness and plate width set by the rolled material setting unit after rolling. The absolute value of the offset amount of the work roll, which is the permissible value set by the permissible value setting unit, is calculated for each type of rolled material, and the calculated offset amount of the work roll for each type of rolled material is calculated. A device for setting an upper limit value of a roll offset amount in a tandem rolling mill, which comprises an upper limit value setting unit for setting an absolute value of the smallest offset amount among absolute values as an upper limit value. Each rolling mill in the tandem rolling mill is arranged between each of the pair of upper and lower working rolls and each of the pair of upper and lower reinforcing rolls, and a pair of upper and lower intermediate rolls for reinforcing each of the pair of upper and lower working rolls. At least one rolling mill offsets the axis of the intermediate roll with respect to the axis of the reinforcing roll on the entry side or the exit side with respect to the rolling direction of the rolled material instead of the axis of the work roll. Have been placed and
The rolled plate cross-sectional shape analysis unit uses the in-side tension, the out-side tension, and the rolling load for each type of rolled material in each rolling machine determined by the rolling schedule determination unit to make each working roll of each rolling machine. And the rolling plate cross section in consideration of the deformation of the working roll of each rolling mill and the rolling direction of the intermediate roll by calculating the force acting on the intermediate roll and changing the offset amount of the intermediate roll of the rolling mill that offsets the intermediate roll. Perform shape analysis to calculate the plate cross-sectional shape of multiple types of rolled materials perpendicular to the rolling direction.
The upper limit value setting unit is a plate cross section based on the plate thickness and width set by the rolled material setting unit after rolling of the plate cross-sectional shapes of the plurality of types of rolled materials calculated by the rolled plate cross-section shape analysis unit. The absolute value of the offset amount of the intermediate roll, which is the permissible value set by the permissible value setting unit for the amount of change changing with respect to the shape, is calculated for each type of rolled material, and each type of rolled material is calculated. The apparatus for setting an upper limit value of a roll offset amount in a tandem rolling mill according to claim 10, wherein the absolute value of the smallest offset amount among the absolute values of the offset amounts of the intermediate rolls is set as an upper limit value. Each rolling mill in the tandem rolling mill is arranged between each of the pair of upper and lower working rolls and each of the pair of upper and lower reinforcing rolls, and a pair of upper and lower intermediate rolls for reinforcing each of the pair of upper and lower working rolls. At least one rolling mill is arranged so that the axis of the intermediate roll is offset with respect to the axis of the reinforcing roll on the entry side or the exit side with respect to the rolling direction of the rolled material together with the axis of the work roll. And
The rolled plate cross-sectional shape analysis unit uses the in-side tension, the out-side tension, and the rolling load for each type of rolled material in each rolling machine determined by the rolling schedule determination unit to make each working roll of each rolling machine. And the force acting on the intermediate roll is calculated, and the offset amount of the working roll and the offset amount of the intermediate roll of the rolling mill that offsets the working roll and the intermediate roll are variously changed to roll the working roll and the intermediate roll of each rolling mill. The cross-sectional shape of the rolled plate was analyzed in consideration of the deformation in the direction, and the cross-sectional shapes of the rolled plates perpendicular to the rolling direction were calculated.
The upper limit value setting unit is a plate cross section based on the plate thickness and width set by the rolled material setting unit after rolling of the plate cross-sectional shapes of the plurality of types of rolled materials calculated by the rolled plate cross-sectional shape analysis unit. The absolute value of the offset amount of the working roll and the absolute value of the offset amount of the intermediate roll, which are the permissible values set by the permissible value setting unit for the amount of change changing with respect to the shape, are calculated for each type of rolled material. , The absolute value of the smallest offset amount among the calculated absolute values of the offset amount of the working roll for each type of rolled material is set as the upper limit of the offset amount of the working roll, and for each type of rolled material calculated. The upper limit of the roll offset amount in the tandem rolling mill according to claim 10, wherein the smallest absolute value of the offset amount of the intermediate roll is set as the upper limit value of the offset amount of the intermediate roll. Setting device.

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