JP4590728B2 - Hot rolling method and leveling setting method for hot cross roll mill - Google Patents

Description

といったものにしてもよい。
【００４２】
このモデル式（３）の場合の、クロス角補償項の設定を模式的に図９に示す。
図において、Ｏｐはオペレータサイド、Ｄｒはドライブサイドの略である。
【００４３】
具体的なレベリング設定値は、何を基準に決めればよいかについては、大きく分けて次の３つの考え方がある。
【００４４】
１つ目は、零調時の圧延機のオペレータサイドとドライブサイドのレベリング量差を基準とし、それに対して更に上乗せするレベリング量をレベリング設定値とするものである。ここで零調とは、ロールを研磨したものに交換した際に、圧延機のオペレータサイドとドライブサイドの圧下装置を同調的に圧下してゆき、上下ロールを接触させ、荷重をかけて締め込み、ある程度の荷重になったときにオペレータサイドとドライブサイドの圧下量を異ならせ、両者の締め込み荷重が等しくなるように調整し、両者の締め込み荷重が等しくなったところで、圧下位置の基準とすることである。
【００４５】
２つ目は、圧延サイクルの前半部分である特定の被圧延材（基準材と称する）を先端が曲がらずに通板できた場合、その被圧延材通板時の、圧延機のオペレータサイドとドライブサイドのレベリング量差を基準とし、それに対して更に上乗せするレベリング量をレベリング設定値とするものである。そして３つ目は、基準材を一本前の被圧延材とするものであり、１本被圧延材を圧延するごとに、基準材を逐次更新していく方法である。
【００４６】
上記３つの方法は、どれを使用してもよく、操業状況に応じ、適宜使い分ければよい。
【００４７】
なお、上記３つの方法の中に共通しているレベリング量は、（１）オペレータサイドとドライブサイドの圧下用アクチュエータ長差（油圧圧下で言えば油柱長の差、電動圧下で言えば圧下スクリュウ長の差）、あるいは、（２）上下ロール開度の差または圧下位置の差、いずれであってもよい（（１）（２）は符号が丁度逆の関係にあることが当業者間で知られている）。
【００４８】
【実施例】
以下、レベリング値は、油柱長の差（オペレータサイド油柱長−ドライブサイド油柱長）で定義したものとする。
【００４９】
（実施例１）
低炭素鋼の仕上圧延後板厚2.0〜2.3mm、仕上圧延後板幅900〜1200mmからなる被圧延材群を１つの圧延サイクルとした。加熱炉を分け、No.1、No.2、No.3加熱炉に圧延順に振り分けて装入した。加熱温度は1100℃とした。
【００５０】
前出のようなモデル式で、レベリング設定値を自動計算し、本発明に基づいて実際に圧延機に自動で設定した場合の効果を図１１に示す。ちなみにモデル式は（１）を用いた。
【００５１】
レベリングの基準の取り方であるが、特定の被圧延材（基準材と称する）を先端が曲がらずに通板できた場合、その被圧延材通板時の、圧延機のオペレータサイドとドライブサイドのレベリング量差を基準とし、それに対して更に上乗せするレベリング量をレベリング設定値とする方法によった。
【００５２】
図１０には、比較例として、オペレータの手動介入によった場合を示す。図１０、図１１は共に、縦軸は、レベリング設定値と被圧延材先端の曲がり（蛇行）量を示す。両者を比較すると、オペレータの手動介入によった場合に比べ、本発明を適用した場合は、蛇行量を小さく抑制できていることがわかる。
【００５３】
（実施例２）
モデル式として（１´）、（３）を用いた以外は、実施例１と同条件とした結果を、図１２に示す。図１２は、図１０と比較すると、更に蛇行量を小さく抑制できていることがわかる。
【００５４】
【発明の効果】
本発明によれば、仕上圧延後の被圧延材先端の曲がり（蛇行）を抑制でき、巻き取り後コイルの内巻き部がテレスコ状態になり、アップエンド時に耳折れするなどの品質不良の発生を抑制できるようになった。
【図面の簡単な説明】
【図１】熱間圧延ラインの全体概観を示す図
【図２】コイルの内巻き部のテレスコ状態を示す斜視図
【図３】被圧延材の曲がり（蛇行）発生のメカニズムを解説するための、圧延機ハウジングの斜視図
【図４】同じく、被圧延材を圧延している状態の正面図及び圧延機出側の平面図
【図５】従来の圧延順幅構成（圧延サイクル）の例を示す図
【図６】エッジビルドアップの発生メカニズムを解説するための図
【図７】スケジュールフリー圧延時の圧延順幅構成（圧延サイクル）を示す図
【図８】従来例で問題となる引裂力について模式的に示した図
【図９】本発明によるクロス角補償項の設定を模式的に示した図
【図１０】従来例の実施結果の一例を示す図
【図１１】本発明の実施例の効果の一例を示す図
【図１２】本発明の他の実施例の効果の一例を示す図
【符号の説明】
１…加熱炉
２…粗圧延機
３…クロップシャー
４…仕上圧延機
５…冷却ゾーン
６…コイラー
７…被圧延材
１０…スラブヤード
２０、２１…スラブを製造するための設備（連続鋳造機）
４０…圧延機ハウジング
４２…ハウジング支柱
４２Ａ…ハウジング支柱（オペレータサイド）
４２Ｂ…ハウジング支柱（ドライブサイド）
５０、５０Ａ、５０Ｂ…ロール
１００…熱間圧延ライン[0001]
[Industrial application fields]
The present invention relates to a hot rolling method and a leveling setting method for a hot cross roll rolling mill, and in particular, a hot rolling method suitable for use in a cross roll rolling mill that crosses upper and lower work rolls together, and for the same It relates to a leveling method.
[0002]
[Prior art]
A typical hot rolling line is as shown in FIG. The hot rolling line 100 is broadly divided into a plurality of heating furnaces 1 (in the case of FIG. 1, three units, No. 1, No. 2, and No. 3, respectively), a plurality of rough rolling mills 2 ( In the case of FIG. 1, three units are denoted by R1, R2, and R3, respectively, a crop shear 3, and a plurality of finishing mills 4 (in the case of FIG. 1, seven units, F1, F2, F3, F4, F5, F6) , F7), cooling zone 5, coiler 6 (in the case of FIG. 1, 2 units, DC1, DC2 respectively), and a number of materials 7 to be rolled intermittently To roll.
[0003]
In the hot rolling of metal strips, conventionally, many rolling materials are rolled intermittently, so the rolling mill bites the tip of each rolled material, and rolls the entire length. A series of operations such as tail-out of the tail end was performed, but bending of the material to be rolled after finish rolling (meandering), particularly bending of the material to be rolled after finishing rolling (meandering) may be a problem. there were. The problem is that when the bending (meandering) of the rolled material tip after finish rolling becomes large, the rolled material tip does not wind straight around the coiler 6, and as shown in FIG. The inner winding part is in a so-called telescopic state, and the frequency of poor quality due to ear folds at the up end increases, and in severe cases, the tip of the material to be rolled does not wind around the coiler, and the operation continues. In some cases, it became impossible.
[0004]
The main cause of the occurrence of bending after finish rolling is estimated as follows.
[0005]
Referring to FIG. 3, even if the rolling load acting on the rolling mill during rolling of the material 7 is evenly distributed among the plurality of struts 42 constituting the housing 40 of the rolling mill, the individual struts look exactly the same. Since they are not made in the same manner, the side where the operator is located (hereinafter referred to as the operator side (Op)) 42A between the individual struts when the rolling load is applied and further sandwiching the material 7 to be rolled, This is because there is a difference in elongation between the columns on one side (hereinafter referred to as drive side (Dr)) 42B. In FIG. 3, 50A is an upper work roll, and 50B is a lower work roll.
[0006]
More specifically, when there is a difference in elongation between the operator-side housing column 42A and the drive-side housing column 42B when the rolling load is applied, as shown in FIG. Since the plate thickness on the right side of (B) is thin and the plate thickness on the side where the housing support column is large (left side in FIG. 4B) is thick, this is the difference in elongation in the rolling longitudinal direction of the material to be rolled. As shown in FIG. 4 (D), the thin plate side extends well in the longitudinal direction, and the thick plate side decreases relatively in the longitudinal direction. 4 (D) turns left). 4A and 4C show normal states corresponding to FIGS. 4B and 4D, respectively.
[0007]
The countermeasure is to narrow the gap between the upper and lower rolls on the operator side and drive side to the side where the plate thickness is expected to increase when the rolling load is applied before the end of the material to be rolled is bitten into the finishing mill. It is conceivable to make a compensation intervention to expand the side that is expected to be thinner. This has been one of the operator's main manual interventions since it was operating on the Coffin schedule. This coffin schedule will be described later.
[0008]
By manual intervention by the operator, the leveling (single pressure reduction) is referred to as the compensation intervention operation to narrow the side where the plate thickness is expected to increase when the rolling load is applied and conversely widen the side where the plate thickness is expected to decrease. Specifically, how much μm the difference in actuator length for reduction or the difference in reduction position between the operator side and the drive side is referred to as a leveling set value.
[0009]
On the other hand, in recent years, schedule-free rolling has been aimed at in the operation of hot rolling lines.
[0010]
In a hot rolling line as shown in FIG. 1, wear of a work roll (hereinafter simply referred to as a roll) of a finishing mill progresses to some extent as a number of materials to be rolled are intermittently rolled. Then, it takes the operation form of exchanging it with a polished one. A rolling cycle consists of a group of rolled materials arranged in the rolling order until the roll is polished, several rolled materials are rolled and then rolled until the roll is replaced with a polished one. The number is between tens and hundreds.
[0011]
FIG. 5 is an image of this, but conventionally, when viewed from the first to the last of the rolling cycle in order, the maximum width of the rolling cycle in the rolling cycle is about the first half of the rolling cycle. The so-called coffin is made so that the rolling order is such that the material comes and gradually changes to a wider width before the material with the maximum width and gradually changes to a narrow width after the material with the maximum width. Usually, the rolling width is called a schedule. There are two main reasons for this, and the first is that the thermal expansion of the roll gradually progresses to the entire roll in the first half of the rolling cycle when the roll has not yet been heated sufficiently. To increase the width of the material to be rolled gradually, the second is that the wear of the roll progresses. The width edges of the material to be rolled are applied to the corners, resulting in a plate thickness distribution in the width direction of the material to be rolled, which is called edge build-up as shown in FIG. 6, so as not to cause quality defects such as pressure bonding during annealing.
[0012]
By the way, when actually trying to create a rolling cycle so as to have a rolling forward width configuration as described above, the material to be rolled is still in the slab stage before being charged into the heating furnace 1 of the hot rolling line. In the meantime, you must be prepared to be in that order. This is very time consuming and labor intensive.
[0013]
Preparing and arranging the rolled material slabs in that order leads to the need to store dozens of rolled material slabs for many days, increasing inventory assets and storage space. This caused problems such as shortage, loss of heat energy due to complete cooling of the slab after casting, and delay in delivery.
[0014]
Therefore, in order to solve these problems, in particular, with respect to the finish rolling mill 4, the thermal expansion and wear dispersion of the roll by the work roll shift rolling mill, the rolling under the variable control of the roll crown by the cross roll rolling mill, Techniques have been developed to eliminate the roll wear level difference by grinding with an on-line roll grinder, and so-called rolling schedule-free has been directed toward relaxing or eliminating restrictions on the rolling order of the material to be rolled. Among these, in particular, rolling under variable control of a roll crown by a cross roll rolling mill and elimination by wear level grinding by an on-line roll grinder are making the mainstream position in this technical field stationary.
[0015]
When this schedule-free rolling is actually performed, for example, as shown in FIG. 7, even if a rolling cycle is created in the rolling order that is the connecting order of narrow to wide rolled material, the rolled material product is It is possible to solve the above-mentioned increase in inventory assets without causing quality defects such as edge build-up.
[0016]
However, when the above-described schedule-free rolling is performed, a situation arises in which the rolling load of two continuous materials to be rolled must be rolled under significantly different conditions. When rolling is performed under conditions in which the rolling loads of two continuous rolled materials are greatly different, the bending of the rolled material tip after finish rolling becomes large. As described above, when the rolling load is applied, if there is a difference in elongation between the operator-side housing column and the drive-side housing column, the difference between the rolling load of the two continuous materials to be rolled greatly differs. This is because the difference in elongation between the housing column and the drive column on the drive side is easily enlarged, and therefore bending (meandering) of the tip of the material to be rolled is promoted.
[0017]
Under the rolling operation of the conventional coffin schedule, as a result, the rolling load of the two continuous rolled materials did not differ so much, and the bending after the finish rolling of the rolled material tip did not increase, Although it was a problem that did not become apparent, a solution to this problem was desired under the direction of schedule-free rolling.
[0018]
Regarding the leveling method of the cross roll mill, as shown in JP-A-6-79315, at various cross angles, the operator side has a reduction amount so that the difference in rolling reaction force (rolling load) between the operator side and the drive side becomes zero. The difference between the rolling side and the drive side is calculated, and the deviation (offset) in the rolling longitudinal direction between the axial center points of the upper and lower work rolls is calculated from the difference in the amount of reduction. There has been proposed a leveling method for a cross roll mill in which a difference in reduction is set.
[0019]
[Problems to be solved by the invention]
However, in the conventional manual intervention operation by the operator, there is a case where the leveling is performed accurately and the bending (meandering) of the material to be rolled cannot be sufficiently suppressed.
[0020]
Also in the method disclosed in Japanese Patent Laid-Open No. 6-79315, the tearing force acting at the time of rolling load shown in FIG. 8 differs depending on the difference in the work roll cross angle, which leads to the difference in the width direction distribution of the upper and lower work roll gaps. There was a problem of not considering this.
[0021]
The present invention has been made to solve the above-described conventional problems, and it is an object of the present invention to enable rolling in which the cross angle is greatly changed without causing plate bending.
[0022]
[Means for Solving the Problems]
The present invention automatically calculates the leveling set value using the model formula shown in the formula (1) prior to biting the tip of each material to be rolled into the finishing mill, and sets the leveling setting of the finishing mill. The above problem is solved by automatically performing the above.
ΔAct = {(Pref.i−Pi) / 2} × (1 / Mdr.i−1 / Mop.i) (1)
Where Δ Act is the actuator length difference (operator side-drive side), Pref.i is the rolling load at the tip of the reference material, Pi is the predicted rolling load at the tip of the material to be rolled next, and Mdr.i is the drive side. I is the stiffness of the rolling mill of the operator side (elastic coefficient of the rolling column of the operator side), and i is the finishing mill stand No. It is.
[0023]
The present invention also solves the above-mentioned problem by compensating for the work roll cross angle shown in equations (1 ') and (2) when setting the leveling of the hot cross roll mill. It is a thing.
ΔAct = {(Pref.i−Pi) / 2} × (1 / Mdr.i−1 / Mop.i) + δ (1 ′)
Here, δ is a cross angle compensation term (unit is length) .
δ = k × θ (2)
Here, k is a proportional coefficient, and θ is a cross angle.
The present invention also solves the above-mentioned problem by compensating for the work roll cross angle shown in the formulas (1 ′) and (3) when setting the leveling of the hot cross roll mill. It is a thing.
ΔAct = {(Pref.i−Pi) / 2} × (1 / Mdr.i−1 / Mop.i) + δ (1 ′)
Here, δ is a cross angle compensation term (unit is length).
δ = k × θ (0 ≦ θ <θa)
= K1 (θ−θa) + kθa (θa ≦ θ <θb)
= K2 (θ−θb) + kθa + k1 (θb−θa) (θb ≦ θ) (3)
Here, k is a proportional coefficient, and θ is a cross angle.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0025]
A typical hot rolling line to which the present invention is applied is as shown in FIG. The equipment configuration is as described above.
[0026]
Prior to charging the material slab to be rolled into the heating furnace 1, a slab yard 10 for preparing and temporarily placing the slab is on the inlet side of the heating furnace.
[0027]
In addition to the hot rolling line 100, the equipment for producing the slab should be one or more equipment represented by a continuous casting machine (in the case of FIG. 1, two units, 20 and 21, respectively). What is necessary is just to pass the path | route conveyed to the hot rolling line 100 from there normally through the path | route 30 which is mounted in a slab yard and temporarily waits, but there may be a part which passes through the direct feed path | route 31 without waiting. Good.
[0028]
In the operation of the hot rolling line 100, the roll 50 of the finish rolling mill 4 is polished, until some material to be rolled is rolled and then the roll is replaced with a polished one. Prior to charging the rolling material into the heating furnace 1 of the hot rolling line, the rolling cycle, which is a structural unit in which the group of the rolling material 7 to be rolled, is arranged in the rolling order, is virtualized using a computer (not shown). However, the material to be rolled through the path 30 that is placed on the slab yard and temporarily waits is actually prepared in such a slab yard 10. The material to be rolled is divided and arranged in several slab piles.
[0029]
What is characteristic in the present invention is that the leveling setting of the material 7 to be rolled in the finishing mill 4 is automatically performed using a model formula, and the leveling appropriate amount due to the difference in the work roll cross angle is set to leveling. It is reflected in.
[0030]
In the following, description will be given in order.
[0031]
First, since the leveling setting is automatically performed, an embodiment of the present invention will be described. First, at the command set stage, command data is given to each individual material to be rolled using a computer (not shown). There are various types of command data, but among them, the steel type, the thickness after finish rolling, and the width after finish rolling are directly related to the present invention.
[0032]
Based on data such as steel grade, plate thickness after finish rolling, and plate width after finish rolling, various setting values of the finish rolling mill for each individual material to be rolled in one rolling cycle are processes not shown in the figure. Various settings of the finishing mill are actually made prior to the biting of each individual material to be rolled into the finishing mill. The various settings are mainly the reduction (upper and lower work roll gaps corresponding to the center of the material to be rolled), the bender force, the work roll cross angle, the roll peripheral speed, and the side guide opening of each finishing mill stand.
[0033]
In the process computer, the thickness of each stand of the finishing mill for each steel grade, sheet thickness after finish rolling, and sheet width category after finish rolling (decrease gradually as you go to the subsequent stage stand) The sheet thickness after finishing rolling on the stand exit side is referred to as a sheet thickness schedule), and deformation resistance prediction data for each stand of the finishing mill is stored and stored. Also, according to the difference in the temperature of the material to be rolled after rough rolling measured by a crude rolling mill delivery thermometer (not shown), if it is low, the deformation resistance prediction value is corrected to be high, and conversely, if high, it is corrected to be low. It also has logic.
[0034]
Furthermore, the contact arc length between the work roll and the material to be rolled, and the correction coefficient called the rolling force function are set by the prediction logic not described in detail, and the predicted value of the plate width at each stand (more precisely, the plate after finish rolling) Since it is different from the width, this is also set for each stand by a prediction logic not described in detail), and by multiplying the deformation resistance predicted as described above, the rolling load of the material to be rolled is predicted, In anticipation of the elongation of the rolling mill column under the application of the predicted rolling load, the reduction (upper and lower work roll gaps) is set to be smaller by that amount.
[0035]
However, according to the present invention, various settings of the finishing mill such as the above-described reduction, bender force, work roll cross angle, roll peripheral speed, and side guide opening degree are set for each individual material to be rolled in the rolling cycle. In addition, the leveling amount is automatically set as one of the set values.
[0036]
Specifically, the leveling set value can be automatically calculated by the following model formula and actually set in the rolling mill.
[0037]
Δ Act = {(Pref.i−Pi) / 2} × (1 / Mdr.i−1 / Mop.i) (1)
[0038]
△ Act: Actuator length difference (operator side-drive side)
Pref.i: Rolling load at the tip of the reference material (A predicted value or an actual value may be used, but an actual value is preferred)
Pi: Rolling load predicted value at the tip of the material to be rolled next Mdr.i: Drive side rolling mill rigidity (elastic coefficient of drive side rolling mill column)
Mop.i: Operator side rolling mill rigidity (elastic coefficient of operator side rolling mill support)
i: Finishing mill stand No.
[0039]
When the finishing mill is a cross roll mill, a cross angle compensation term is preferably added as follows in order to compensate for the amount corresponding to the cross angle of the work roll.
[0040]
Δ Act = (Pref.i−Pi) / 2 × (1 / Mdr.i−1 / Mop.i) + δ (1 ′)
δ: Cross angle compensation term (unit is length)
[0041]
Here, the tearing force acting at the time of rolling load shown in FIG. 8 tends to increase as the work roll cross angle increases. Therefore, in order to compensate for this, it is preferable to use a linear model as the cross angle compensation term. A linear model is, for example,
δ = k × θ (2)
k: proportional coefficient θ: cross angle, or, for example, depending on the range of the cross angle,

It may be something like this.
[0042]
FIG. 9 schematically shows the setting of the cross angle compensation term in the case of this model equation (3).
In the figure, Op stands for operator side, and Dr stands for drive side.
[0043]
The specific leveling setting values can be roughly divided into the following three concepts as to what should be determined.
[0044]
The first is to set the leveling amount as a leveling set value based on the difference in leveling amount between the operator side and the drive side of the rolling mill during zero adjustment. Here, zero tone means that when the roll is replaced with a polished one, the rolling down on the operator side and drive side of the rolling mill is performed synchronously, the upper and lower rolls are brought into contact, and a load is applied and tightened. The amount of reduction on the operator side and the drive side when the load reaches a certain level is adjusted so that both tightening loads are equal, and when both tightening loads are equal, It is to be.
[0045]
Second, 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 operator side of the rolling mill at the time of passing the material to be rolled Based on the difference in leveling amount on the drive side, the leveling amount that is further added to the difference is used as the leveling setting value. The third method uses the reference material as the previous material to be rolled, and is a method of sequentially updating the reference material every time one material is rolled.
[0046]
Any of the above three methods may be used, and may be properly used depending on the operation status.
[0047]
The leveling amount common to the above three methods is as follows: (1) Actuator length difference between operator side and drive side (difference in oil column length under hydraulic pressure, reduction screw under electric pressure) The difference in length), or (2) the difference between the upper and lower roll opening degrees or the difference in the rolling position may be any one of those skilled in the art that the signs of (1) and (2) are exactly opposite. Are known).
[0048]
【Example】
Hereinafter, the leveling value is defined as the difference in oil column length (operator side oil column length−drive side oil column length).
[0049]
Example 1
A rolled material group consisting of a sheet thickness of 2.0 to 2.3 mm after finish rolling of low carbon steel and a sheet width of 900 to 1200 mm after finish rolling was defined as one rolling cycle. The heating furnaces were divided and charged into No.1, No.2, No.3 heating furnaces in order of rolling. The heating temperature was 1100 ° C.
[0050]
FIG. 11 shows the effect when the leveling set value is automatically calculated by the model formula as described above and is automatically set in the rolling mill based on the present invention. Incidentally, (1) was used as the model formula.
[0051]
This is the standard for leveling. When a specific material to be rolled (referred to as a reference material) can be passed without bending the tip, the operator side and drive side of the rolling mill when the material to be rolled is passed. The leveling amount difference is used as a reference, and the leveling amount to be further added is set as the leveling set value.
[0052]
FIG. 10 shows a case of manual intervention by an operator as a comparative example. In both FIG. 10 and FIG. 11, the vertical axis indicates the leveling set value and the amount of bending (meandering) at the tip of the material to be rolled. When both are compared, it can be seen that the amount of meandering can be reduced to a smaller extent when the present invention is applied, compared to the case where the manual intervention of the operator is applied.
[0053]
(Example 2)
FIG. 12 shows the results obtained under the same conditions as in Example 1 except that (1 ′) and (3) are used as model equations. FIG. 12 shows that the amount of meandering can be further reduced as compared with FIG.
[0054]
【The invention's effect】
According to the present invention, the bending (meandering) of the tip of the material to be rolled after finish rolling can be suppressed, and the inner winding portion of the coil is in a telescopic state after winding, and the occurrence of poor quality such as ear folding at the up end can occur. It became possible to suppress.
[Brief description of the drawings]
FIG. 1 is a diagram showing an overview of a hot rolling line. FIG. 2 is a perspective view showing a telescopic state of an inner winding portion of a coil. FIG. 3 is a diagram for explaining a mechanism of bending (meandering) of a material to be rolled. , Perspective view of rolling mill housing [FIG. 4] Similarly, a front view of a state in which the material to be rolled is rolled and a plan view of the rolling mill exit side [FIG. 5] Example of conventional rolling forward width configuration (rolling cycle) Fig. 6 is a diagram for explaining the mechanism of edge build-up. Fig. 7 is a diagram showing a rolling forward width configuration (rolling cycle) during schedule-free rolling. Fig. 8 is a tear force that is a problem in the conventional example. FIG. 9 is a diagram schematically illustrating the setting of a cross angle compensation term according to the present invention. FIG. 10 is a diagram illustrating an example of the implementation result of a conventional example. FIG. 11 is an embodiment of the present invention. FIG. 12 is a diagram showing an example of the effect of the other embodiment of the present invention. Figure [EXPLANATION OF SYMBOLS] showing an example of
DESCRIPTION OF SYMBOLS 1 ... Heating furnace 2 ... Rough rolling mill 3 ... Crop shear 4 ... Finishing mill 5 ... Cooling zone 6 ... Coiler 7 ... Rolled material 10 ... Slab yard 20, 21 ... Equipment for manufacturing a slab (continuous casting machine)
40 ... rolling mill housing 42 ... housing support 42A ... housing support (operator side)
42B ... Housing support (drive side)
50, 50A, 50B ... Roll 100 ... Hot rolling line

Claims (3)

Prior to biting the tip of each material to be rolled into the finishing mill, leveling setting values are automatically calculated using the model formula shown in formula (1), and the leveling setting of the finishing mill is automatically performed. A hot rolling method characterized by that.
ΔAct = {(Pref.i−Pi) / 2} × (1 / Mdr.i−1 / Mop.i) (1)
Where Δ Act is the actuator length difference (operator side-drive side), Pref.i is the rolling load at the tip of the reference material, Pi is the predicted rolling load at the tip of the material to be rolled next, and Mdr.i is the drive side. I is the stiffness of the rolling mill of the operator side (elastic coefficient of the rolling column of the operator side), and i is the finishing mill stand No. . The leveling setting of the hot cross roll rolling mill is characterized by compensating for the amount corresponding to the cross angle of the work roll shown in the formulas (1 ′) and (2) when setting the leveling of the hot cross roll rolling mill. Method.
ΔAct = {(Pref.i−Pi) / 2} × (1 / Mdr.i−1 / Mop.i) + δ (1 ′)
Here, δ is a cross angle compensation term (unit is length) .
δ = k × θ (2)
Here, k is a proportional coefficient, and θ is a cross angle. The leveling setting of the hot cross roll rolling mill is characterized by compensating for the amount corresponding to the cross angle of the work roll shown in the formulas (1 ′) and (3) when setting the leveling of the hot cross roll rolling mill. Method.
ΔAct = {(Pref.i−Pi) / 2} × (1 / Mdr.i−1 / Mop.i) + δ (1 ′)
Where δ is a cross angle compensation term (unit is length).
δ = k × θ (0 ≦ θ <θa)
= K1 (θ−θa) + kθa (θa ≦ θ <θb)
= K2 (θ−θb) + kθa + k1 (θb−θa) (θb ≦ θ) (3)
Here, k is a proportional coefficient, and θ is a cross angle.

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