JP2018176197A - On-traveling plate thickness change method in tandem rolling machine - Google Patents

On-traveling plate thickness change method in tandem rolling machine Download PDF

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JP2018176197A
JP2018176197A JP2017076720A JP2017076720A JP2018176197A JP 2018176197 A JP2018176197 A JP 2018176197A JP 2017076720 A JP2017076720 A JP 2017076720A JP 2017076720 A JP2017076720 A JP 2017076720A JP 2018176197 A JP2018176197 A JP 2018176197A
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plate thickness
thickness
finish
change
roll gap
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JP6628049B2 (en
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佑輔 吉岡
Yusuke Yoshioka
佑輔 吉岡
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Jfeスチール株式会社
Jfe Steel Corp
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Abstract

PROBLEM TO BE SOLVED: To provide an on-traveling plate thickness change method for a tandem rolling machine in a case where a forwarding material and a following material have difference (material quality difference) in original plate thickness or finish plate thickness and also deformation resistance.SOLUTION: There is provided an on-traveling plate thickness change method in a tandem rolling machine, where a forwarding material and a following material having a different rolling condition are jointed and subjected to successive cold rolling. Upon changing rolling condition for the forwarding material to rolling condition for the following material during traveling, it is determined whether roll gap change level as a difference between roll gap setting value exceeds a predetermined value previously set. In a case where the roll gap change level exceeds the predetermined value, a middle finish plate thickness is set so that the roll gap change level is lowered than the predetermined value at a stage before the joint point between the forwarding material and following material, and the finish plate thickness of the forwarding material is changed to the middle finish plate thickness. When the joint point passes through the tandem rolling machine, the middle finish plate thickness for the forwarding material is changed to the finish plate thickness for the following material.SELECTED DRAWING: Figure 4

Description

本発明は、先行被圧延材と後行被圧延材とを接合し、連続して冷間圧延するタンデム圧延機における走間板厚変更方法に関し、特に、母板板厚や仕上板厚、変形抵抗(材質)等の圧延条件が異なる先行被圧延材と後行被圧延材とを走間板厚変更し、連続して圧延するタンデム圧延機における走間板厚変更方法に関するものである。   The present invention relates to a method of changing the thickness of a running plate in a tandem rolling machine which joins a material to be rolled and a material to be rolled backward and cold-rolls continuously, in particular, the base plate thickness, finished plate thickness, deformation The present invention relates to a method of changing the running plate thickness in a tandem rolling mill, in which a preceding rolled material and a following rolled material having different rolling conditions such as resistance (material) are changed in running plate thickness and rolled continuously.
タンデム圧延機において、先行被圧延材(以降、「先行材」という)と後行被圧延材(以降、「後行材」という)とを接合し、連続して冷間圧延する際、先行材と後行材との間で、母板板厚や仕上板厚、変形抵抗(材質))等の圧延条件が異なると、走間板厚変更したときにスタンド間の張力に大きな変動が生ずる。この張力変動量が大き過ぎると、板破断や絞込み等が発生し、大きな圧延トラブルを引き起こすことになる。   In a tandem rolling mill, when preceding rolling material (hereinafter referred to as "preceding material") and trailing rolling material (hereinafter referred to as "following material") are joined and cold rolled continuously, When the rolling conditions such as the base plate thickness, finished plate thickness, deformation resistance (material) and the like differ between the following and the following material, when the running thickness is changed, a large fluctuation occurs in the tension between the stands. If the amount of fluctuation in tension is too large, breakage of the plate, narrowing of the plate or the like may occur to cause a large rolling trouble.
上記のような圧延トラブルを回避する対策として、先行材と後行材の接合部に中間仕上板厚部を設けることで、過大な張力変動を抑える技術が提案されている。上記中間仕上板厚を決定する方法としては、例えば、特許文献1および2には、仕上板厚、材質等に応じて予め設定しておいたテーブル値に基づいて決定する方法が、また、特許文献3〜5には、先行材と後行材の仕上板厚から簡易な計算で求める方法が提案されている。   As a measure for avoiding the above-mentioned rolling troubles, a technique is proposed in which excessive tension fluctuation is suppressed by providing an intermediate finish plate thick portion at the joint portion of the preceding material and the following material. As a method of determining the thickness of the intermediate finished plate, for example, in Patent Documents 1 and 2, a method of determining based on a table value previously set according to the finished plate thickness, material, etc. In the documents 3 to 5, a method is proposed which is obtained by simple calculation from the finish plate thickness of the preceding material and the following material.
特開2005−219063号公報Unexamined-Japanese-Patent No. 2005-219063 特開2006−224119号公報Unexamined-Japanese-Patent No. 2006-224119 特開2003−260505号公報JP 2003-260505 A 特開2003−136117号公報JP 2003-136117 A 特開平10−192936号公報Unexamined-Japanese-Patent No. 10-192936 gazette
しかしながら、上記特許文献1または2に開示された、予め決定しておいたテーブル値を使用する方法は、中間仕上板厚が経験則から決められているため、母板板厚や仕上板厚、材質等の中間仕上板厚に影響する因子の組み合わせが多数存在する中から最適な中間仕上板厚を設定することは難しいという問題がある。また、上記特許文献3〜5に開示された、先行材と後行材の仕上板厚から簡易な計算で中間仕上板厚を算出する方法は、先行材と後行材との間で変形抵抗の変動がある場合には、やはり張力変動を抑制することはできないという問題がある。   However, in the method of using a predetermined table value disclosed in Patent Document 1 or 2 above, since the thickness of the intermediate finish plate is determined from the rule of thumb, the base plate thickness and finish plate thickness, There is a problem that it is difficult to set an optimum intermediate finish plate thickness from among many combinations of factors that affect the intermediate finish plate thickness such as materials. Further, the method of calculating the thickness of the intermediate finish plate by simple calculation from the finish plate thickness of the leading material and the trailing material disclosed in Patent Documents 3 to 5 is the deformation resistance between the leading material and the trailing material. There is a problem that tension fluctuation can not be suppressed if the
本発明の目的は、従来技術が抱える上記の問題点に鑑みてなされたものであり、その目的は、先行材と後行材との間で、母板板厚や仕上板厚の違いに加えて、変形抵抗の差(材質差)がある場合のように圧延条件が異なるときでもスタンド間の張力変動を大幅に低減することができるタンデム圧延機における走間板厚変更方法を提案することにある。   The object of the present invention has been made in view of the above problems of the prior art, and the object is to add the difference in base plate thickness and finish plate thickness between the preceding and following materials. To propose a method of changing the thickness between running strips in a tandem rolling mill which can significantly reduce the tension fluctuation between stands even when rolling conditions are different as in the case where there is a difference in deformation resistance (material difference). is there.
発明者らは、上記課題の解決に向けて鋭意検討を重ねた。その結果、上記課題を解決するためには、先行材における圧延条件を後行材における圧延条件に走間変更するにあたり、ロールギャップ設定値の差であるロールギャップ変更量が予め設定した所定値を超えているか否かを判定し、上記のロールギャップ変更量が上記所定値を超えているときは、上記先行材と後行材の接合点より前の段階でロールギャップ変更量が所定値以下となるような中間仕上板厚を設定し、先行材の仕上板厚を中間仕上板厚に変更し、上記接合点がタンデム圧延機を通過するときに、上記先行材の中間仕上板厚から後行材の仕上板厚に変更することにより、走間板厚変更時の張力変動を大幅に軽減できることを見出し、本発明を開発するに至った。   The inventors diligently studied to solve the above problems. As a result, in order to solve the above problems, when changing the rolling conditions of the preceding material to the rolling conditions of the following material, the roll gap change amount, which is the difference between the set values of the roll gap, is a predetermined value set in advance. If the roll gap change amount exceeds the predetermined value, it is determined that the roll gap change amount is equal to or less than the predetermined value at a stage before the joining point of the preceding and following materials. Intermediate finish plate thickness is set, the finish plate thickness of the preceding material is changed to the intermediate finish plate thickness, and when the junction point passes through the tandem rolling mill, It has been found that by changing the finish plate thickness of the material, it is possible to significantly reduce the tension fluctuation at the time of the change in running plate thickness, and the present invention has been developed.
すなわち、本発明は、圧延条件が異なる先行材と後行材とを接合し、連続して冷間圧延するタンデム圧延機における走間板厚変更方法において、上記先行材における圧延条件を後行材における圧延条件に走間変更するにあたり、ロールギャップ設定値の差であるロールギャップ変更量が予め設定した所定値を超えているか否かを判定し、上記のロールギャップ設定値の差が上記所定値を超えているときは、上記先行材と後行材の接合点より前の段階でロールギャップ設定値の差が所定値以下となるような中間仕上板厚を設定し、先行材の仕上板厚を中間仕上板厚に変更し、上記接合点がタンデム圧延機を通過するときに、上記先行材の中間仕上板厚から後行材の仕上板厚に変更することを特徴とするタンデム圧延機における走間板厚変更方法を提案する。   That is, according to the present invention, in the method of changing the thickness between running plates in a tandem rolling mill which joins the preceding material and the succeeding material under different rolling conditions and continuously cold-rolls the rolling conditions of the preceding material as the following material. It is determined whether or not the roll gap change amount, which is the difference between the roll gap setting values, exceeds the predetermined value set in advance, when changing the running distance to the rolling conditions in step Set the thickness of the intermediate finishing plate so that the difference between the set values of the roll gap is less than the specified value at the stage before the junction point of the preceding and succeeding materials, and the finished plate thickness of the preceding material In the tandem rolling machine, the intermediate finishing plate thickness is changed to the intermediate finishing plate thickness of the preceding material to the finished plate thickness of the following material when the joining point passes through the tandem rolling mill. Running thickness change method Proposed.
また、本発明の上記タンデム圧延機における走間板厚変更方法は、上記先行材の中間仕上板厚から後行材の仕上板厚に変更する際のロールギャップの変更量が最小となるよう中間仕上板厚を決定することを特徴とする。   Further, in the tandem rolling machine according to the present invention, the method of changing the thickness between running plates is such that the amount of change in roll gap when changing from the thickness of the intermediate finish plate of the preceding material to the finish plate thickness of the following material is minimized. It is characterized in that the finish plate thickness is determined.
本発明によれば、タンデム圧延機で圧延条件が異なる先行材と後行材とを接合し、走間板厚変更を行う際、最適な中間仕上板厚を設定することが可能となるので、スタンド間の張力変動を大幅に低減することができる。従って、本発明によれば、走間板厚変更に伴う板破断や絞り込み等の圧延トラブルを抑止し、従来、走間板厚変更が難しいとされていた先行材と後行材の組み合わせでも走間板厚変更が可能となるので、圧延機の生産性向上に大いに寄与する。   According to the present invention, it is possible to set the optimum intermediate finish plate thickness when joining the preceding and succeeding materials under different rolling conditions with a tandem rolling mill and changing the running plate thickness. Tension variation between the stands can be significantly reduced. Therefore, according to the present invention, rolling troubles such as plate breakage and narrowing-down due to thickness change of running gap can be suppressed, and running can be performed even with a combination of leading material and trailing material which has been considered to be difficult to change thickness during running thickness. Since the thickness can be changed, it greatly contributes to the improvement of the productivity of the rolling mill.
本発明を適用することができる冷間圧延設備の概要図である。It is a schematic diagram of the cold rolling equipment which can apply the present invention. 本発明の走間板厚変更方法を説明する図である。It is a figure explaining the running plate thickness change method of this invention. 本発明における中間仕上板厚の算出フローの概要図である。It is a schematic diagram of a calculation flow of middle finishing board thickness in the present invention. 図3のステップ5の中間仕上板厚決定ロジックを説明する図である。It is a figure explaining the intermediate | middle finish board thickness determination logic of step 5 of FIG. 本発明の走間板厚変更方法と、従来の走間板厚変更方法における各スタンド間の張力変動等を実測した結果を示したグラフである。It is the graph which showed the result of having measured the tension fluctuation etc. between each stand in the change board thickness change method of the present invention, and the conventional change board thickness change method.
以下、本発明の実施の形態について、図面を参照しながら説明する。
図1は、本発明の走間板厚変更を実施することが可能な冷間圧延設備の概略構成図である。図1において、冷間圧延機2は、nスタンドの圧延機F〜F(ただし、n>1)が連設されたタンデム式の冷間圧延機(ただし、図中には、第1スタンドFと最終スタンドFのみを図示)であり、最終Fスタンドの圧延機の下流側には、ピンチロール3、走間切断機4およびテンションリール5が、上流から下流に向けて順次配設され、冷間圧延機2で所定の板厚に圧延された被圧延材1(鋼板)は、テンションリール5においてコイル状に巻き取られる。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration view of a cold rolling facility capable of carrying out the change of running plate thickness according to the present invention. In FIG. 1, the cold rolling mill 2 is a tandem cold rolling mill in which n rolling mills F 1 to F n (where n> 1) are connected in series (wherein, the first rolling mill). Only the stand F 1 and the final stand F n are shown, and on the downstream side of the rolling mill of the final F n stand, a pinch roll 3, an inter-run cutting machine 4 and a tension reel 5 sequentially from upstream to downstream The material to be rolled 1 (steel plate), which is disposed and rolled to a predetermined thickness by the cold rolling mill 2, is wound on the tension reel 5 in a coil shape.
被圧延材1は、冷間圧延機2の入側に配設された図示されていない溶接機により、先行材Sの尾端と後行材Sの先端とが接合点Cで溶接等で接合された後、冷間圧延機2の第1スタンドFから最終のFスタンドまで順次に圧延されて所定の仕上板厚に圧延され、その後、先行材Sと後行材Sとの接合点Cあるいはその近傍において走間切断機4により切断され、切断された後行材Sは、先行材Sとは別のテンションリール5により巻き取られる。 In the material 1 to be rolled, the tail end of the preceding material S A and the tip of the following material S B are welded at the joining point C by a welding machine (not shown) disposed on the entry side of the cold rolling mill 2 after in bonded, are sequentially rolled from the first stand F 1 of the cold rolling mill 2 to the last F n stand is rolled to a predetermined finish thickness, then, the preceding material S a and the following material S B It is cut by an inter-running cutter 4 at the junction C or near the row material S B after being cut is wound by a separate tension reel 5 and the preceding material S a.
ここで、冷間圧延機2のそれぞれのスタンドF〜Fには、上下のワークロール間のギャップを変更する圧下装置6〜6が設置されており、該圧下装置6〜6は、制御装置7によりその動作が制御されている。
先行材Sと後行材Sとで、母板板厚や仕上板厚、変形抵抗などの圧延条件が異なる場合、冷間圧延機2で先行材Sと後行材Sとを連続して圧延するときには走間で圧延条件が変更され、走間板厚変更が行われる。一般に、走間板厚変更に際しては、先行材Sと後行材Sとの接合点Cが第1スタンドFに到達すると、制御装置7は、先行材S用の圧下スケジュールから後行材S用の圧下スケジュールになるよう、スタンドFの圧下装置6に制御信号を送り、これを第2スタンドF以降でも繰り返す。具体的には、制御装置7は、接合点Cが各スタンドF〜Fを通過する時刻を圧下スケジュールの変更量から演算し、接合点Cが各スタンドF〜Fを通過する時刻に、各スタンドF〜Fの圧下装置6〜6に制御信号を送り、各スタンドのワークロール間のギャップの設定変更およびロール周速の設定変更を行う。
Here, each of the stand F 1 to F n of the cold rolling mill 2, pressure device 61 through n to change the gap between the upper and lower work rolls are installed, piezoelectric under device 61 through The operation of n is controlled by the controller 7.
Previous strip in the S A and the following material S B, base plate thickness Ya finish thickness, if the rolling conditions such as deformation resistance differs, the preceding material S A and the following material S B in the cold rolling mill 2 When rolling continuously, the rolling conditions are changed between runs, and the thickness change between runs is performed. In general, when Hashimaban thickness changes, the preceding material S A junction of the following material S B and C reaches the first stand F 1, the control device 7, after the pressure schedule for the preceding material S A so that the reduction schedule for next strip S B, sends a control signal to the pressing device 61 of the stand F 1, repeating this even second stand F 2 or later. Time More specifically, the control unit 7, the junction C is calculated from the amount of change in time of the reduction schedule through each stand F 1 to F n, junction C passes each stand F 1 to F n Then, control signals are sent to the pressure reducing devices 6 1 to 6 n of the stands F 1 to F n to change the setting of the gap between the work rolls of each stand and to change the setting of the roll circumferential speed.
ここで、上記各スタンドF〜Fにおけるロール周速は、各スタンド間の張力が所定張力となるように設定されるが、板厚変更点(接合点C)がスタンド間にあるときは、当該スタンド間には厚い被圧延材と薄い被圧延材とが存在するため、スタンド間張力を、少なくとも薄い側の被圧延材が破断せず、かつ、厚い側の被圧延材が絞り込みを起こさない、適度な張力範囲となるよう設定しなくてはならない。しかし、先行材Sと後行材Sとの間で、母板板厚や仕上板厚、変形抵抗が大きく異なる場合には、走間板厚変更に伴うスタンド間の張力変動が大きくなって、板破断や絞込み等の圧延トラブルを引き起こすおそれがある。 Here, the roll peripheral speed in each of the stands F 1 to F n is set so that the tension between the stands becomes a predetermined tension, but when the thickness change point (joint point C) is between the stands Since there is a thick material to be rolled and a thin material to be rolled between the stands, at least the material to be rolled on the thin side does not break while the material to be rolled on the thick side narrows down. There is no, it should be set to be a reasonable tension range. However, between the preceding material S A and the following material S B, base plate thickness Ya finish thickness, if the deformation resistance are significantly different, increases the tension variation between stands due to Hashimaban thickness change May cause rolling troubles such as plate breakage and narrowing.
そこで、本発明に係るタンデム圧延機における走間板厚変更方法においては、先行材Sと後行材Sとの間の母板板厚や仕上板厚、変形抵抗の差に起因して大きな張力変動が発生することが予測される場合には、図2に示すように、まず、仕上板厚を、先行材Sの仕上板厚tから中間仕上板厚tに変更する板厚変更(第1回目の走間板厚変更)を行った後、上記中間仕上板厚tから後行材Sの仕上板厚tへと板厚変更(第2回目の走間板厚変更)を行うようにする。このようにすることで、接合点Cの前後における母板板厚や仕上板厚、変形抵抗の大きな変化があっても、圧延トラブルを起こすことなく走間板厚変更を行うことが可能となる。なお、図2においては、先行材Sの仕上板厚tが後行材Sの仕上板厚tよりも厚い場合を示したが、その逆であってもよい。 Therefore, in the-fly thickness changing in the tandem rolling mill according to the present invention, the base plate thickness Ya finish thickness between the preceding material S A and the following material S B, due to the difference in deformation resistance If it is predicted that a large tension fluctuation will occur, as shown in FIG. 2, first, the plate thickness is changed from the finish plate thickness t a of the preceding material S A to the intermediate finish plate thickness t c after thickness change (first round-fly thickness change), the thickness changes to finish plate thickness t b of the next strip S B from the intermediate finish plate thickness t c (second round of Hashimaban Change the thickness). By doing so, even if there is a large change in base plate thickness, finished plate thickness and deformation resistance before and after the junction point C, it becomes possible to change the running thickness without causing rolling troubles. . Although FIG. 2 shows the case where the finish plate thickness t a of the leading material S A is thicker than the finish plate thickness t b of the following material S B , the opposite may be applied.
ここで、上記のように中間仕上板厚を設ける2段階の走間板厚変更を行うか否かの判定は、以下のようにして行う。上記先行材における圧延条件を後行材における圧延条件に走間変更するにあたり、ロールギャップ設定値の差であるロールギャップ変更量が予め設定した所定値を超えているか否かを判定し、上記のロールギャップ設定値の差が上記所定値を超えているときは、上記先行材と後行材の接合点より前の段階でロールギャップ設定値の差が所定値以下となるような中間仕上板厚を設定し、先行材の仕上板厚を中間仕上板厚に変更し、上記接合点がタンデム圧延機を通過するときに、上記先行材の中間仕上板厚から後行材の仕上板厚に変更する。   Here, it is determined as follows whether or not to perform the two-step running plate thickness change in which the intermediate finish plate thickness is provided as described above. When changing the rolling condition of the preceding material to the rolling condition of the following material, it is determined whether the amount of change in roll gap, which is the difference between the set values of roll gap, exceeds a predetermined value set in advance. When the difference between the roll gap setting values exceeds the above-mentioned predetermined value, the thickness of the intermediate finished plate is such that the difference between the roll gap setting values becomes equal to or less than the predetermined value before the joining point of the preceding and following materials. Is set, the finish plate thickness of the preceding material is changed to the intermediate finish plate thickness, and the intermediate finish plate thickness of the preceding material is changed to the finish plate thickness of the following material when the junction passes through the tandem rolling mill. Do.
また、本発明における上記中間仕上板厚の決定は、先行材と後行材のロールギャップ設定から算出することを特徴としており、その算出フローの概要を図3に示したが、以下のようにして行う。
(ステップ1)
先行材Sのドラフトスケジュール(パススケジュール)を計算し,先行材Sの各スタンド出側の板厚を算出する。
(ステップ2)
上記先行材の各スタンド出側の板厚を達成するために必要な各スタンドのロールギャップの設定値Gおよびロール周速の設定値を算出する。
(ステップ3、4)
同様にして、後行材Sのドラフトスケジュール(パススケジュール)を計算し,後行材Sの各スタンド出側の板厚を算出するとともに、上記後行材の各スタンド出側の板厚を達成するために必要な各スタンドのロールギャップの設定値Gおよびロール周速の設定値を算出する。
(ステップ5)
先行材Sのロール間ギャップGと後行材Sのロール間ギャップGを用いて中間仕上板厚tを算出する。
Further, the determination of the thickness of the intermediate finishing plate in the present invention is characterized by calculation from the setting of the roll gap of the preceding and following materials, and the outline of the calculation flow is shown in FIG. Do.
(Step 1)
Preceding material S A draft schedule (pass schedule) was calculated, to calculate the thickness of each stand outlet side of the preceding material S A.
(Step 2)
And calculates the setting values of G a and roll peripheral speed of the roll gap of each stand required to achieve the thickness of each stand delivery side of the preceding material.
(Steps 3 and 4)
Similarly, the following material S B draft schedule (pass schedule) was calculated, to calculate the thickness of each stand outlet side of the following material S B, the thickness of each stand outlet side of the trailing member and calculates the setting values of G b and the roll peripheral speed of the roll gap of each stand needed to achieve.
(Step 5)
The intermediate finished plate thickness t c is calculated using the gap G a between rolls of the preceding material S A and the gap G b between rolls of the following material S B.
上記図3において、(ステップ1〜4)は、従来公知の技術であり、本発明の特徴は(ステップ5)の中間仕上板厚tの算出方法にある。そこで、上記(ステップ5)の中間仕上板厚tの決定ロジックについて、図4を用いて、具体的に説明する。
まず、前提条件として、本発明では、中間仕上板厚tで圧延する部分を、先行材Sの後端に設ける。すなわち、仕上板厚tから中間仕上板厚tへの板厚変更(第1回目の走間板厚変更)は、先行材の後端(接合点Cより前)で行い、先行材と後行材の接合点Cが圧延機を通過する際、中間仕上板厚tから後行材Sの仕上板厚tへの板厚変更(第2回目の走間板厚変更)を行うものとする。
そして、本発明においては、中間仕上板厚の算出は、先行材と後行材の接続部分Cでの板厚変更(第2回目の走間板厚変更)で必要となるロールギャップの変更量が最小となるよう中間仕上板厚の値を決定する。すなわち、上記中間仕上板厚の算出手法は、以下の評価関数を最小化する問題に帰着できる。
ここで、上記式中のGb,iは、後行材のiスタンドのロールギャップ設定値、Gc,iは、中間板厚部のiスタンドの圧下位置設定値、Wは、iスタンドの重み(定数)、Nは圧延機のスタンド数である。さらに、この問題を解くときに、中間板厚ドラフトスケジュールは、先行材Sの圧下率配分に基づくという制約を加える。この制約は、異常なドラフトスケジュールになることを防ぐために追加する。
In FIG. 3, (steps 1 to 4) are conventionally known techniques, and the feature of the present invention lies in the method of calculating the intermediate finished plate thickness t c of (step 5). Therefore, the decision logic of the intermediate finish thickness t c of the (Step 5), with reference to FIG. 4, specifically described.
First, as a precondition, in the present invention, a portion of rolling with an intermediate finish plate thickness t c, provided at the rear end of the preceding material S A. That is, the thickness change from the finish thickness t a to the intermediate finish thickness t c (first change in running thickness) is performed at the back end of the preceding material (before the joining point C), and when the junction C of the next strip is passed through the rolling mill, the thickness changes from the intermediate finish plate thickness t c to finish the thickness t b of the next strip S B (the second time-fly thickness change) Assumed to be performed.
And, in the present invention, the calculation of the thickness of the intermediate finish plate is the amount of change in the roll gap which is necessary for the plate thickness change at the connecting portion C of the preceding material and the following material Determine the value of the intermediate finish plate thickness so as to minimize. That is, the method of calculating the intermediate finished plate thickness can be reduced to the problem of minimizing the following evaluation function.
Here, G b, i in the above equation is the roll gap setting value of the i stand of the following material, G c, i is the rolling position setting value of the i stand of the middle plate thick portion, and W i is the i stand Weight (constant), N is the number of stands of the rolling mill. Furthermore, when solving this problem, an intermediate plate thickness draft schedule, adding a constraint that is based on the reduction rate allocation of preceding material S A. This restriction is added to prevent anomalous draft schedule.
図4のフローチャートにおいては、まず、板厚の微小変化量Δtと、許容誤差Errを定める。
次に、中間仕上板厚部のドラフトスケジュール計算や設定計算に必要な情報を入力する。このとき、中間仕上板厚部は、先行材の後端に設けるので、中間仕上板厚部の情報として、先行材の情報を入力する。
次に、中間仕上板厚部の初期設定として、先行材の母板板厚、仕上板厚を設定する。反復計算内では、先行材の圧下率配分に基づいたドラフトスケジュール計算を行い、設定計算から中間仕上板厚部のロール間ギャップ設定値Gc,i(tc)を求める。
次に、中間仕上板厚部の仕上板厚をΔtだけ変化させ、上記の計算を再度行って、中間仕上板厚部のロール間ギャップ設定値Gci(tc+Δt)を求める。評価関数が最小であるための必要条件は、上記Jの微分係数(dotJ)をFとしたとき、F=0であるので、この方程式に対してニュートン法を適用し、以下のように中間仕上板厚部の出側板厚を更新する。
この反復処理を|F|<Errとなるまで繰り返し、このときの中間仕上板厚tcを最適な中間仕上板厚として決定する。
In the flowchart of FIG. 4, first, the minute change amount Δt of the plate thickness and the allowable error Err are determined.
Next, information necessary for draft schedule calculation and setting calculation of the intermediate finished plate thickness portion is input. At this time, since the intermediate finish plate thick portion is provided at the rear end of the preceding material, the information of the preceding material is input as the information of the intermediate finish plate thick portion.
Next, as the initial setting of the intermediate finish plate thickness portion, the base plate thickness and finish plate thickness of the preceding material are set. In the iterative calculation, draft schedule calculation based on the reduction ratio allocation of the preceding material is performed, and the inter-roll gap setting value G c, i (t c ) of the intermediate finished plate thickness portion is determined from the setting calculation.
Next, the finished plate thickness of the intermediate finished plate thick portion is changed by Δt, and the above calculation is performed again to determine the inter-roll gap setting value G ci (t c + Δt) of the intermediate finished plate thick portion. The necessary condition for the evaluation function to be minimum is F = 0, where F is the derivative of J above, so Newton method is applied to this equation, and the intermediate finishing is performed as follows: Update the thickness of the exit side plate thickness.
This iterative process | F | repeated until <Err, to determine an intermediate finish thickness t c of the time as the best intermediate finish thickness.
上記のように、本発明においては、先行材と後行材の接合点Cでの板厚変更(第2回目の走間板厚変更)で必要となるロールギャップの変更量が最小となるよう中間仕上板厚の値を設定することで、第2回目の走間板厚変更におけるスタンド間の張力変動を抑制する技術であり、第1回目の走間板厚変更に伴う張力変動については考慮していない。この理由は、第2回目の走間板厚変更には、材料の変化という不連続な変更点があり、それによる影響を能動的に除去するアクチュエータがないのに対して、第1回目の走間板厚変更では、不連続な要素はなく、ロールギャップの変更と回転速度の変更を協調させることで、張力変動を抑えることができるからである。   As described above, in the present invention, the amount of change in the roll gap required by the plate thickness change at the joining point C between the preceding material and the following material (the second thickness change between running plates) is minimized. By setting the value of the intermediate finish plate thickness, it is a technology to suppress the tension variation between stands in the second run gap thickness change, and the tension variation accompanying the first run gap thickness change is considered I did not. The reason for this is that the second run gap thickness change has a discontinuous change point of the material change, and there is no actuator that actively removes the influence of it, while the first run There is no discontinuous element in the gap thickness change, and it is possible to suppress the tension fluctuation by coordinating the change of the roll gap and the change of the rotational speed.
表1に示すように、母板板厚と変形抵抗(材質)が異なる先行材と後行材を溶接して接合し、4スタンドのタンデム式冷間圧延機で同じ仕上板厚(t=t)に圧延する際の走間板厚変更について、下記の2つの条件でシミュレーションを行った。
<条件1>
従来と同様、先行材と後行材の接合点を境にして、1回の走間板厚変更で母板板厚および材質の変化に対応した走間板厚変更を行う(従来法)。
<条件2>
先行材の後端で先行材の仕上板厚を中間仕上板厚に変更する第1回目の走間板厚変更を行い、先行材と後行材の接合点が圧延機を通過する際、上記中間仕上板厚から後行材の仕上板厚を変更する第2回目の走間板厚変更を行う走間板厚変更において、上記中間仕上板厚を、図4に示したフローで算出し、そのドラフトスケジュールに従って圧延する(本発明法)。
なお、上記<条件2>の2段階走間板厚変更をシミュレートした理由は、母板板厚と変形抵抗(材質)が異なる表1の先行材と後行材の組み合わせでは、ロールギャップ変更量が基準値を超えているため、1回の走間板厚変更では、スタンド間張力の大きな変動が予測されたからである。
As shown in Table 1, the base plate thickness and deformation resistance (material) is welded to different preceding material and the following material joined, same finish plate thickness at the 4 stand tandem cold rolling mill (t a = A simulation was performed under the following two conditions with respect to a change in running thickness during rolling to t b ).
<Condition 1>
As in the conventional case, the running gap thickness change corresponding to the change in the base plate thickness and the material is performed in a single running gap thickness change at the boundary of the joining point of the leading material and the trailing material (conventional method).
<Condition 2>
The first run gap thickness change to change the finishing plate thickness of the leading material to the intermediate finishing plate thickness at the back end of the leading material, and when the joining point between the leading and trailing materials passes through the rolling mill In the second run gap thickness change in which the second run gap thickness change is performed to change the finish plate thickness of the subsequent material from the intermediate finish plate thickness, the intermediate finish plate thickness is calculated according to the flow shown in FIG. It rolls according to the draft schedule (this invention method).
The reason for simulating the two-step running plate thickness change of <Condition 2> is the roll gap change in the combination of the preceding and following materials in Table 1 having different base plate thickness and deformation resistance (material). Because the amount exceeds the reference value, a large change in inter-stand tension was predicted in one run distance plate thickness change.
上記の2条件で走間板厚変更を行なったときの各スタンドのロール圧下および出側板厚の変化、ならびに、各スタンド間の張力の変化をシミュレートした結果を図5に、また、上記各スタンド間の張力変動の最大値を表2に示した。
この結果から、本発明の方法で走間板厚変更を行うことにより、従来の1回の走間板厚変更で行う方法と比較して、スタンド間の張力変動の最大値を1/2以下に低減できることが予測された。
The results of simulating changes in roll pressure and exit side plate thickness of each stand and changes in tension between the stands when the running plate thickness is changed under the above two conditions are shown in FIG. The maximum value of tension variation between the stands is shown in Table 2.
From this result, the maximum value of the tension fluctuation between the stands is 1⁄2 or less as compared with the conventional method performed by changing the running plate thickness once by performing the running plate thickness change according to the method of the present invention Could be reduced to
1:被圧延材(鋼板)
2:スタンドのタンデム圧延機
3:ピンチロール
4:走間切断機
5:テンションロール(巻取機)
〜6:圧下装置
7:制御装置
:先行材
:後行材
C:接合点(溶接点)
1: Rolled material (steel plate)
2: Stand tandem rolling machine 3: Pinch roll 4: Running distance cutting machine 5: Tension roll (winding machine)
6 1 to 6 n : pressure reduction device 7: control device S A : leading material S B : trailing material C: joint point (welding point)

Claims (2)

  1. 圧延条件が異なる先行材と後行材とを接合し、連続して冷間圧延するタンデム圧延機における走間板厚変更方法において、
    上記先行材における圧延条件を後行材における圧延条件に走間変更するにあたり、ロールギャップ設定値の差であるロールギャップ変更量が予め設定した所定値を超えているか否かを判定し、上記のロールギャップ設定値の差が上記所定値を超えているときは、上記先行材と後行材の接合点より前の段階でロールギャップ設定値の差が所定値以下となるような中間仕上板厚を設定し、先行材の仕上板厚を中間仕上板厚に変更し、
    上記接合点がタンデム圧延機を通過するときに、上記先行材の中間仕上板厚から後行材の仕上板厚に変更することを特徴とするタンデム圧延機における走間板厚変更方法。
    In the method of changing the running plate thickness in a tandem rolling mill in which a leading material and a trailing material having different rolling conditions are joined and cold rolling is performed continuously,
    When changing the rolling condition of the preceding material to the rolling condition of the following material, it is determined whether the amount of change in roll gap, which is the difference between the set values of roll gap, exceeds a predetermined value set in advance. When the difference between the roll gap setting values exceeds the above-mentioned predetermined value, the thickness of the intermediate finished plate is such that the difference between the roll gap setting values becomes equal to or less than the predetermined value before the joining point of the preceding and following materials. Set the finish plate thickness of the preceding material to the intermediate finish plate thickness,
    A method for changing the run distance in a tandem rolling mill, characterized in that the thickness of the intermediate finish plate of the preceding material is changed to the finish thickness of the subsequent material when the junction passes through the tandem rolling mill.
  2. 上記先行材の中間仕上板厚から後行材の仕上板厚に変更する際のロールギャップの変更量が最小となるよう中間仕上板厚を決定することを特徴とする請求項1に記載のタンデム圧延機における走間板厚変更方法。 2. The tandem according to claim 1, wherein the thickness of the intermediate finish plate is determined so as to minimize the change amount of the roll gap when changing the intermediate finish plate thickness of the preceding material to the finish plate thickness of the subsequent material. A method of changing the running plate thickness in a rolling mill.
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