JP6327214B2 - Leveling setting method and apparatus in hot finish rolling - Google Patents

Description

  The present invention relates to a leveling setting method and apparatus in hot finish rolling that prevents meandering of a material to be rolled in finish rolling of a hot-rolled steel sheet, particularly finish rolling immediately after replacing a rolling roll.

  A finish rolling mill for hot-rolled steel sheets is usually a tandem rolling mill in which a plurality of rolling mills (rolling stands) are arranged and rolled in one direction. When the material to be rolled meanders with respect to the traveling direction in the finish rolling mill, a phenomenon called drawing occurs in which the material to be rolled is rolled in a state where it is folded against the side guide on the rolling stand entry side. Due to this phenomenon, the material to be rolled is torn between the rolling stands, and the rolling rolls are wrinkled.Therefore, the line stop time for searching and removing the broken pieces and replacing the rolling rolls is generated. It will greatly hinder.

  In particular, when the tip and tail ends of the material to be rolled pass through a tandem rolling mill, the front and rear tensions are not applied to the tip and tail ends, respectively, so the force to restore the material to be rolled in the center direction of the line width. The material to be rolled is easy to meander.

  In order to prevent this meandering phenomenon, the tandem rolling mill is equipped with a mechanism called “leveling” that can make a difference between the rolling position on the drive side of the rolling roll and the rolling position on the operator side. Various techniques have been proposed for preventing meandering.

For example, in Patent Document 1, a technique for correcting the leveling of the rolling stand by changing the control gain α in the following equation in accordance with the time or distance from the end of the material to be rolled through the immediately preceding rolling stand. is suggesting.
S _df = −α · ΔP _df / M
Here, S _df : leveling correction amount, α: control gain, ΔP _df : deviation of load on the drive side and operator side in the stand, M: parallel rigidity

  Patent Document 2 proposes a leveling setting method for calculating the leveling setting value of the rolling mill with respect to the tip of the material to be rolled from the rolling load and cross angle setting between a certain reference material and the material to be rolled.

  Patent Document 2 discloses three types of methods for selecting a reference material necessary for setting a leveling set value for the tip of a material to be rolled.

  In the first method, the leveling amount between the operator side and the drive side of the rolling stand during zero adjustment is used as a reference, and the leveling amount further added thereto is used as the leveling set value. Here, zero adjustment means that when the rolling rolls are replaced, the rolling down on the operator side and the drive side of the rolling stand is performed in a synchronous manner, the upper and lower rolls are brought into contact with each other, tightened with a load, The amount of rolling on the operator side and the drive side when the load reaches the load is adjusted so that the tightening loads on both sides are equal, and the leveling amount on the operator side and drive side where both tightening loads are equal It is based on (difference in reduction position).

  In the second method, when a specific material to be rolled (referred to as a reference material) that is the first half of the rolling cycle can be passed without bending the tip, the leveling amount of the rolling stand when the material to be rolled is passed. The leveling amount that is further added to the above is used as the leveling set value.

  In the third method, the reference material is used as the previous material to be rolled, and each time the material to be rolled is rolled, the reference material is sequentially updated.

JP 9-38710 A JP 2002-178018 A

  However, the method described in Patent Document 1 is effective in preventing meandering of the tail end of the plate, but cannot contribute to preventing meandering of the tip of the material to be rolled.

  On the other hand, among the methods described in Patent Document 2, in order to perform zero tone by the first method, it is necessary to stop the rolling of the material to be rolled and perform it only with the rolling roll, so that it is performed very frequently. There is a problem that hinders productivity.

  Further, the second method has a problem that manual intervention adjustment by the operator is necessary every time until the reference material can be passed without bending in the rolling cycle.

  In the third method, when changing the material to be rolled, it is an effective method in the case of the same rolling roll between the preceding and succeeding rolled materials, but when exchanging the rolling roll between the preceding and following rolled materials, The leveling setting in rolling of the previous material to be rolled is not effective for preventing meandering, and the operator visually confirms the amount of meandering immediately after the tip of the material to be rolled bites into the rolling mill, and based on experience and intuition. In many cases, leveling is adjusted manually. In this case, depending on the skill of the operator, the meandering may not be prevented accurately, and there is a problem that the meandering of the tip of the material to be rolled leads to an unplanned line stop.

  Therefore, the problem of the present invention is that leveling setting in a hot rolling line that can prevent meandering of the rolled material in finish rolling even when the rolling roll is changed between the preceding and following rolled material. It is to provide a method and apparatus.

  The present inventor has observed and recorded a situation where an operator with excellent skill manually adjusts the leveling of the tip of the material to be rolled, and investigated the relationship with various operating conditions. As shown in FIG. It has been found that the leveling adjustment amount increases immediately after the work roll to be used is replaced. Here, as shown in FIG. 8, the work roll is composed of a combination of a roll body 400 made of cast iron and a pair of chocks 401 for gripping and reducing the roll body 400 on the drive side / operator side of the rolling mill. Become.

  In addition, the present inventor, for an integrated combination of the same chock and work roll, adjusts the leveling even if the rolling timing of the rolled material such as the components and dimensions of the material to be rolled by the work roll differs. It was found that the value was smaller than the leveling adjustment value of an integrated combination of other chocks and work rolls. The reason for this is presumed to be that the difference in manufacturing and built-in dimensional accuracy, which is unique for each integrated combination of chock and work roll, has a correlation with the leveling adjustment value.

  This invention is completed based on the above knowledge, and provides the following (1)-(4).

(1) A leveling setting method for hot finishing rolling in which leveling setting is performed immediately after a work roll is incorporated into a rolling stand in hot finishing rolling,
The work roll and the chock incorporated on the left and right of the work roll are integrally managed by a chock number, the work roll and the chock integrated with each other are rolled into a rolling stand, the material to be rolled is rolled, and the tip of the material to be rolled in the rolling stand Measure the leveling amount at the tail end and / or extract the leveling value that could be finish-rolled from the actually measured leveling amount, and calculate the reference leveling value corresponding to the chock number from the leveling value A reference leveling value calculating step;
A reference leveling value storing step for storing a reference leveling value for each chock number;
When the work roll and chock corresponding to the chock number are incorporated into a rolling stand of a hot finish rolling mill and the material to be rolled is hot-rolled, the reference leveling value stored corresponding to the chock number is set as the leveling value. Leveling value setting step;
A leveling setting method for hot finish rolling, characterized by comprising:

(2) A leveling setting method for hot finishing rolling in which leveling setting is performed immediately after incorporating a work roll into a rolling stand in hot finishing rolling,
The work roll and the chock incorporated on the left and right of the work roll are integrally managed by a chock number, the work roll and the chock integrated with each other are rolled into a rolling stand, the material to be rolled is rolled, and the tip of the material to be rolled in the rolling stand And / or measuring the leveling amount and rolling load at the tail end, extracting the leveling amount and rolling load that could be finish-rolled from the actually measured leveling amount, and determining the relationship between the leveling amount and the rolling load. A step of calculating the relationship between the leveling amount to be calculated and the rolling load;
A step of calculating a reference leveling value and a reference rolling load for calculating a reference leveling value and a reference rolling load corresponding to the chock number from the extracted leveling amount and the rolling load;
A storage step for storing the reference leveling value for each chock number, the reference rolling load, and the relationship between the leveling amount and the rolling load;
A load prediction step for predicting a rolling load of a material to be rolled to be rolled immediately after incorporating the work roll;
When the work roll and chock corresponding to the chock number are incorporated into a rolling stand of a hot finish rolling mill and the material to be rolled is hot rolled, the reference leveling value stored corresponding to the chock number and the reference rolling From the load, the relationship between the leveling amount and the rolling load, and the predicted rolling load of the material to be rolled immediately after incorporating the work roll, a leveling value setting step for setting a leveling value,
A leveling setting method for hot finish rolling, characterized by comprising:

(3) A leveling setting device for a rolling stand in hot finish rolling,
The work roll and the chock incorporated on the left and right of the work roll are integrally managed by a chock number, the work roll and the chock integrated with each other are rolled into a rolling stand, the material to be rolled is rolled, and the tip of the material to be rolled in the rolling stand Measure the leveling amount at the tail end and / or extract the leveling value that could be finish-rolled from the actually measured leveling amount, and calculate the reference leveling value corresponding to the chock number from the leveling value A reference leveling value calculating means;
A reference leveling value storage means for storing a reference leveling value for each chock number;
When the work roll and chock corresponding to the chock number are incorporated into a rolling stand of a hot finish rolling mill and the material to be rolled is hot-rolled, the reference leveling value stored corresponding to the chock number is set as the leveling value. Leveling value setting means;
A leveling setting apparatus for hot finish rolling.

(4) A leveling setting device for a rolling stand in hot finish rolling,
The work roll and the chock incorporated on the left and right of the work roll are integrally managed by a chock number, the work roll and the chock integrated with each other are rolled into a rolling stand, the material to be rolled is rolled, and the tip of the material to be rolled in the rolling stand And / or measuring the leveling amount and rolling load at the tail end, extracting the leveling amount and rolling load that could be finish-rolled from the actually measured leveling amount, and determining the relationship between the leveling amount and the rolling load. Means for calculating the relationship between the leveling amount to be calculated and the rolling load;
From the extracted leveling amount and the rolling load, a reference leveling value corresponding to a chock number and a reference rolling load for calculating a reference leveling value and a reference rolling load are calculated.
Storage means for storing the reference leveling value for each chock number, the reference rolling load, and the relationship between the leveling amount and the rolling load;
A load predicting means for predicting a rolling load of a material to be rolled immediately after incorporating the work roll;
When the work roll and chock corresponding to the chock number are incorporated into a rolling stand of a hot finish rolling mill and the material to be rolled is hot rolled, the reference leveling value stored corresponding to the chock number and the reference rolling From the load, the relationship between the leveling amount and the rolling load, and the predicted rolling load of the material to be rolled immediately after incorporating the work roll, a leveling value setting means for setting a leveling value,
A leveling setting apparatus for hot finish rolling.

  According to the present invention, in finish rolling of a hot-rolled steel sheet, particularly finish rolling immediately after exchanging a roll for rolling, meandering of the material to be rolled can be sufficiently prevented, stable rolling is possible, and production efficiency is improved.

It is a schematic block diagram which shows an example of the hot rolling line to which this invention is applied. It is a flowchart for demonstrating the 1st example of a leveling setting method. It is a block diagram which shows the 1st leveling setting apparatus for enforcing the 1st leveling setting method. It is a flowchart for demonstrating the 2nd example of a leveling setting method. It is a block diagram which shows the 2nd leveling setting apparatus for enforcing the 2nd leveling setting method. It is a figure which shows the result of the Example of this invention. It is a figure which shows an example of transition of the leveling adjustment amount of a finishing mill. It is a figure which shows the structure of a pair of chock and work roll used for a hot finish rolling mill.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a schematic configuration diagram showing an example of a hot rolling line to which the present invention is applied.
The hot rolling line 100 includes a heating furnace 1 (in FIG. 1, three examples No. 1 to 3 are shown), a rough rolling machine 2 (in FIG. 1, an example having three rolling stands R1 to R3 is shown). , Crop shear 3, finishing mill 4 having a plurality of rolling stands (FIG. 1 shows an example having seven rolling stands F1 to F7), cooling zone 5, coiler (winding machine) 6 (example of FIG. 1) In this example, a series of hot rolling processes of heating-rough rolling-crop cutting-finish rolling-cooling-winding are performed on a plurality of materials 7 to be rolled. Are carried out continuously.

  In the operation of the hot rolling line 100, prior to charging the material to be rolled into the heating furnace 1 of the hot rolling line, a polished work roll 50 is incorporated into each rolling stand of the finishing mill 4, Next, a rolling cycle, which is a structural unit arranged in the rolling order, is virtually created using a computer (not shown) for the group of the material 7 to be rolled before the work roll is replaced ( This is called an instruction set). Then, immediately after the work roll is incorporated into the rolling stand of the finish rolling mill 4, the work roll leveling is set.

  Hereinafter, an example of a work roll leveling setting method in the finish rolling mill 4 will be described.

  First, a first example of the leveling setting method will be described. FIG. 2 is a flowchart for explaining a first example of the leveling setting method.

  First, the work roll and the chock incorporated into the left and right are integrally managed by the chock number, and the work roll and the chock thus integrated are incorporated into the rolling stand and the material to be rolled is rolled, and then the material 7 to be rolled in the rolling stand. Measure the leveling amount at the tip and / or tail end, and extract the leveling value that could be finished rolling from the measured leveling amount by the calculation unit that performs leveling calculation described later, and corresponded to the chock number A reference leveling value is calculated (step 1; reference leveling value calculation step).

  At this time, when a new work roll is incorporated in the chock and used for rolling for the first time, the leveling is set by the operator or the leveling is automatically set by the technique described in the conventional method. At this time, the leveling performance after the operator manually adjusts the setting or the automatic setting is measured by the leveling measuring device. Thereafter, after rolling a plurality of materials to be rolled and rolling one rolling cycle, the calculation unit calculates a reference leveling value for the combination of the work roll and chock from the measured leveling results for each rolled material. To do.

  As this method, there are a method of simply averaging the leveling values that could be finished rolling, or a method of adopting an intermediate value of the leveling setting in consideration of a mistake in the leveling setting by manual intervention. is there.

  The work roll chock number and the reference leveling value calculated in step 1 corresponding to the chock number are stored in a storage unit to be described later for each chock number (step 2; reference leveling value storage step).

  When a combination of a work roll and a chock having a predetermined chock number is used again for rolling, the reference leveling value stored in the storage unit is stored after the work roll and the chock are incorporated into the rolling stand of the finish rolling mill 4. It sets as a leveling value of the first rolling material (step 3; leveling value setting step).

  By setting the leveling as described above, it is effective to meander the rolled material in the finish rolling even when the rolling roll is changed between the rolled material before and after (for each combination with chock). Can be prevented.

  FIG. 3 is a block diagram showing a first leveling setting apparatus for carrying out the first leveling setting method described above.

  The first leveling setting device 200 includes a storage unit 201, a calculation unit 202, a leveling measurement unit 203, and an operation unit 204.

  The storage unit 201 is configured as a reference leveling value storage unit that stores a reference leveling value for each chock number as described above.

  The calculation unit 202 includes the reference leveling value calculation unit 211 that calculates the reference leveling value corresponding to the chock number as described above, and the leveling value setting unit 212 that performs the leveling value setting step as described above.

  The leveling measurement unit 203 measures the leveling amount of the material 7 to be rolled, and the actual measurement value is sent to the calculation unit 202.

  The operation unit 204 includes a keyboard, a display, and the like, and performs an operation of calling necessary data from the storage unit 201 and causing the calculation unit 202 to perform calculation.

  The leveling setting is performed by the first leveling device 200 as described above.

  Next, a second example of the leveling setting method will be described. FIG. 4 is a flowchart for explaining a second example of the leveling setting method. In this example, a more preferable example in which an actual measurement value of the rolling load is taken into account will be described.

  In this example, the work roll and the chock to be assembled to the left and right are first managed integrally by the chock number, and after the work roll and chock integrated in this way are incorporated into the rolling stand and the material to be rolled is rolled, The leveling amount and rolling load at the front end and / or tail end of the rolled material 7 are measured, and the leveling amount and rolling load that can be finish-rolled are extracted from the actually measured leveling amount and rolling load, and the leveling is performed. The relationship between the amount and the rolling load is calculated by a known means such as a least square method (step 11; leveling amount / rolling load relationship calculating step).

  Then, a reference leveling value corresponding to the chock number is calculated from the leveling amount extracted in the same manner as in the first example, and further, a reference rolling load corresponding to the chock number is calculated from the extracted rolling load (step 12; reference Leveling value / reference rolling load calculation step).

  The work roll chock number, the reference leveling value and the reference rolling load calculated in step 12 corresponding to the chock number, and the relationship between the leveling amount calculated in step 11 and the rolling load will be described later for each chock number. It memorize | stores in a memory | storage part (step 13; memory | storage step).

  Furthermore, the rolling load of the material to be rolled immediately after incorporation of the work roll is predicted by an appropriate method including a conventionally known method such as analysis from rolling theory (step 14; load prediction step).

When a combination of a work roll and a chock having a predetermined chock number is used for rolling again, after the work roll and the chock are incorporated into a rolling stand of the finish rolling mill 4, the material to be rolled 7 is hot-rolled. Stored in the reference leveling value, the reference rolling load, the influence coefficient of the rolling load on the leveling value indicating the relationship between the leveling amount and the rolling load, and the predicted rolling load predicted in step 14, for example, The leveling set value is obtained and set by the following equation (1) (step 15; leveling setting step).
L _ev = L _{ev. i} + {( _Pref.i− P) / 2} × α _i (1)
Here, L _ev is a leveling set value, and L _{ev. i} is a reference leveling value of a combination of a work roll and a chock with chock number i, _{Pref. i} is the rolling load reference value of the combination of the work roll of chock number i and the chock, P is the predicted rolling load value of the material to be rolled next, α _i is the leveling in the combination of the work roll of chock number i and the chock It is an influence coefficient of the rolling load on the value.

  By performing the leveling setting as described above, even if the rolling roll is changed between the preceding and following rolled materials, or the components and dimensions of the rolled material are greatly changed, the rolled material in finish rolling. The meandering of the material can be effectively prevented. In addition, since the measured value of the rolling load is taken into account, the meandering of the material to be rolled can be more effectively prevented than in the first example.

  FIG. 5 is a block diagram showing a second leveling setting apparatus for carrying out the second leveling setting method described above.

  The second leveling setting device 300 includes a storage unit 301, a calculation unit 302, a leveling measurement unit 303, a rolling load measurement unit 304, and an operation unit 305.

  The storage unit 301 is configured as a storage unit that stores the reference leveling value and the reference rolling load for each chock number as described above, and the relationship between the leveling amount and the rolling load.

  As described above, the calculation unit 302 calculates the relationship between the leveling amount and the rolling load by means of the least square method or the like, and the leveling amount / rolling load relationship calculating unit 311 and the choking number from the leveling amount extracted as described above. The reference leveling value / reference rolling load calculation means 312 for calculating the corresponding reference leveling value and calculating the reference rolling load corresponding to the chock number from the extracted rolling load, and immediately after incorporating the work roll as described above The load predicting means 313 for predicting the rolling load of the material to be rolled to the level, and the leveling value is set using the reference leveling value, the reference rolling load, the relationship between the leveling amount and the rolling load, and the predicted rolling load as described above. Leveling value setting means 314.

  The leveling measurement unit 303 measures the leveling amount of the material 7 to be rolled, and the actual measurement value is sent to the calculation unit 302.

  The rolling load measuring unit 304 measures the rolling load of the material to be rolled, and the measured value is sent to the calculating unit 302.

  The operation unit 305 includes a keyboard, a display, and the like. The operation unit 305 calls necessary data from the storage unit 301 and performs an operation for causing the calculation unit 302 to calculate.

  The leveling setting is performed by the second leveling device 300 as described above.

Next, examples of the present invention will be described.
Here, when the material to be rolled is hot-rolled using the hot rolling line in FIG. 1, leveling is set for the first material to be rolled after the work roll is incorporated by the method of the present invention. Compared with hand setting. The conditions of the material to be rolled and the rolling conditions were as follows.
Steel type of material to be rolled: low carbon steel Width of material to be rolled: 800 to 1800 mm
Finishing mill entrance side thickness: 35-40 mm
Finishing mill exit side plate thickness: 2.0 to 6.0 mm
Work roll diameter of each rolling stand: 600 to 800 mm
Finishing mill rolling speed: 560 to 1200 mpm
Steel plate temperature on the finishing rolling mill entry side: 950 to 1050 ° C
Steel plate temperature on finishing roll exit: 850-900 ° C

  The result is shown in FIG. The horizontal axis in FIG. 6 is the leveling setting value of the present invention before passing the tip of the material to be rolled or the leveling setting value set by manual intervention by the operator, and the vertical axis is no longer meandering of the plate after passing the tip of the material to be rolled. It is the actual value which adjusted leveling. Here, as the leveling setting method of the present invention, the method according to equation (1) of the second example was used. When the present invention was applied, the standard deviation of the leveling adjustment amount was reduced by 40% compared to the case where the operator manually set. The large leveling adjustment amount means that the plate is meandering when passing the tip, and since the adjustment amount is reduced by the present invention, the present invention is effective in suppressing the meandering of the material to be rolled. It was confirmed that

DESCRIPTION OF SYMBOLS 1 Heating furnace 2 Rough rolling mill 3 Crop shear 4 Finish rolling mill 5 Cooling zone 6 Coiler 7 Rolled material 50 Work roll 100 Hot rolling line 200 1st leveling setting apparatus 201 Memory | storage part 202 Calculation part 203 Leveling measurement part 204 Operation Unit 211 reference leveling value calculation unit 212 leveling value setting unit 300 second leveling setting device 301 storage unit 302 calculation unit 303 leveling measurement unit 304 rolling load measurement unit 305 operation unit 311 leveling amount / rolling load relationship calculation unit 312 reference leveling value Reference rolling load calculation means 313 Load prediction means 314 Leveling value setting means 400 Roll body 401 Chock

Claims (4)

A leveling setting method for hot finishing rolling in which leveling setting is performed immediately after incorporating a work roll into a rolling stand in hot finishing rolling,
The work roll and the chock incorporated on the left and right of the work roll are integrally managed by a chock number, the work roll and the chock integrated with each other are rolled into a rolling stand, the material to be rolled is rolled, and the tip of the material to be rolled in the rolling stand Measure the leveling amount at the tail end and / or extract the leveling value that could be finish-rolled from the actually measured leveling amount, and calculate the reference leveling value corresponding to the chock number from the leveling value A reference leveling value calculating step;
A reference leveling value storing step for storing a reference leveling value for each chock number;
When the work roll and chock corresponding to the chock number are incorporated into a rolling stand of a hot finish rolling mill and the material to be rolled is hot-rolled, the reference leveling value stored corresponding to the chock number is set as the leveling value. Leveling value setting step;
A leveling setting method for hot finish rolling, characterized by comprising: A leveling setting method for hot finishing rolling in which leveling setting is performed immediately after incorporating a work roll into a rolling stand in hot finishing rolling,
The work roll and the chock incorporated on the left and right of the work roll are integrally managed by a chock number, the work roll and the chock integrated with each other are rolled into a rolling stand, the material to be rolled is rolled, and the tip of the material to be rolled in the rolling stand And / or measuring the leveling amount and rolling load at the tail end, extracting the leveling amount and rolling load that could be finish-rolled from the actually measured leveling amount, and determining the relationship between the leveling amount and the rolling load. A step of calculating the relationship between the leveling amount to be calculated and the rolling load;
A step of calculating a reference leveling value and a reference rolling load for calculating a reference leveling value and a reference rolling load corresponding to the chock number from the extracted leveling amount and the rolling load;
A storage step for storing the reference leveling value for each chock number, the reference rolling load, and the relationship between the leveling amount and the rolling load;
A load prediction step for predicting a rolling load of a material to be rolled to be rolled immediately after incorporating the work roll;
When the work roll and chock corresponding to the chock number are incorporated into a rolling stand of a hot finish rolling mill and the material to be rolled is hot rolled, the reference leveling value stored corresponding to the chock number and the reference rolling From the load, the relationship between the leveling amount and the rolling load, and the predicted rolling load of the material to be rolled immediately after incorporating the work roll, a leveling value setting step for setting a leveling value,
A leveling setting method for hot finish rolling, characterized by comprising: A leveling setting device for a rolling stand in hot finish rolling,
The work roll and the chock incorporated on the left and right of the work roll are integrally managed by a chock number, the work roll and the chock integrated with each other are rolled into a rolling stand, the material to be rolled is rolled, and the tip of the material to be rolled in the rolling stand Measure the leveling amount at the tail end and / or extract the leveling value that could be finish-rolled from the actually measured leveling amount, and calculate the reference leveling value corresponding to the chock number from the leveling value A reference leveling value calculating means;
A reference leveling value storage means for storing a reference leveling value for each chock number;
When the work roll and chock corresponding to the chock number are incorporated into a rolling stand of a hot finish rolling mill and the material to be rolled is hot-rolled, the reference leveling value stored corresponding to the chock number is set as the leveling value. Leveling value setting means;
A leveling setting apparatus for hot finish rolling. A leveling setting device for a rolling stand in hot finish rolling,
The work roll and the chock incorporated on the left and right of the work roll are integrally managed by a chock number, the work roll and the chock integrated with each other are rolled into a rolling stand, the material to be rolled is rolled, and the tip of the material to be rolled in the rolling stand And / or measuring the leveling amount and rolling load at the tail end, extracting the leveling amount and rolling load that could be finish-rolled from the actually measured leveling amount, and determining the relationship between the leveling amount and the rolling load. Means for calculating the relationship between the leveling amount to be calculated and the rolling load;
From the extracted leveling amount and the rolling load, a reference leveling value corresponding to the chock number and a reference rolling load calculating means for calculating a reference leveling value and a reference rolling load ;
Storage means for storing the reference leveling value for each chock number, the reference rolling load, and the relationship between the leveling amount and the rolling load;
A load predicting means for predicting a rolling load of a material to be rolled immediately after incorporating the work roll;
When the work roll and chock corresponding to the chock number are incorporated into a rolling stand of a hot finish rolling mill and the material to be rolled is hot rolled, the reference leveling value stored corresponding to the chock number and the reference rolling From the load, the relationship between the leveling amount and the rolling load, and the predicted rolling load of the material to be rolled immediately after incorporating the work roll, a leveling value setting means for setting a leveling value,
A leveling setting apparatus for hot finish rolling.

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