JP3520188B2 - Rolling method of different thickness steel plate - Google Patents
Rolling method of different thickness steel plateInfo
- Publication number
- JP3520188B2 JP3520188B2 JP31502897A JP31502897A JP3520188B2 JP 3520188 B2 JP3520188 B2 JP 3520188B2 JP 31502897 A JP31502897 A JP 31502897A JP 31502897 A JP31502897 A JP 31502897A JP 3520188 B2 JP3520188 B2 JP 3520188B2
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- Prior art keywords
- rolling
- sectional area
- steel sheet
- side sectional
- product
- Prior art date
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、長手方向に板厚の
異なる厚肉部と薄肉部を有する異厚鋼板の圧延方法に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rolling a steel sheet of different thickness having a thick portion and a thin portion having different sheet thicknesses in the longitudinal direction.
【０００２】[0002]
【従来の技術】厚板の製造に当たっては、圧延能率・歩
留等の向上を図るため、同じ板厚の製品を複数組み合わ
せて１枚の板として圧延するのが一般的である。しか
し、特殊な鋼板や納期に余裕がなく適正な組合せ相手が
見つからない場合には、歩留が非常に低い状態でも圧延
を行なわなければならない問題があった。2. Description of the Related Art In the manufacture of thick plates, it is common to combine a plurality of products having the same plate thickness into a single plate in order to improve the rolling efficiency and the yield. However, when a special steel plate or a delivery date cannot be afforded and an appropriate combination partner cannot be found, there is a problem that rolling must be performed even in a state where the yield is very low.
【０００３】最近においては、例えば特公昭５２−２６
２２３号公報、特公昭５０−３６８２６号公報で提案の
ように、同一のスラブに板厚の異なる製品を組み合わせ
た鋼板を得る異厚圧延が行なわれるようになり、組合せ
の自由度が増すことで低歩留圧延の回避が図られてきて
いる。Recently, for example, Japanese Patent Publication No. 52-26
As proposed in Japanese Laid-Open Patent Publication No. 223 and Japanese Patent Publication No. 50-36826, different thickness rolling is performed to obtain a steel sheet in which the same slab is combined with products having different sheet thicknesses, and the degree of freedom in combination is increased. Avoidance of low yield rolling has been attempted.
【０００４】[0004]
【発明が解決しようとする課題】異厚圧延を適用する厚
板圧延では、図３に示すように一次圧延を行なって厚み
の厚い厚肉部Ｙを得た後、厚さの薄い製品鋼板に合わせ
て該厚肉部の一部を二次圧延して薄肉部を得る圧延方法
が採用されのが一般的である。In thick plate rolling to which different thickness rolling is applied, primary rolling is performed as shown in FIG. 3 to obtain a thick portion Y having a large thickness, and then a product steel sheet having a small thickness is formed. In addition, a rolling method is generally adopted in which a part of the thick portion is secondarily rolled to obtain a thin portion.
【０００５】しかしながら、異厚圧延を行う厚板圧延で
は異厚圧延の前工程で幅出し圧延を行っているが、この
幅出し圧延の過程で板幅が過大になる場合や製鋼工程か
ら供給されるスラブの重量が予定重量を初めから下廻っ
ている場合に於いては、二次圧延を行なった薄肉部Ｘの
製品鋼板は予定通り得られるが、厚みの厚い厚肉部Ｙか
らは予定の鋼板製品の一部が採取不能となる。このた
め、例えば、該厚肉部Ｙが単重の大きい製品のみで構成
されている場合には、歩留りが大幅に低下し、また、厚
肉部Ｙが納期的に緊急性の高いもので構成され、薄肉部
Ｘには緊急性の比較的低いものが存在していた場合に
は、緊急性の高いものは採取不能となり、緊急性の比較
的低い製品が採取可能となる等の圧延自由度の狭いもの
であった。However, in the thick plate rolling for different thickness rolling, the tenter rolling is performed in the preceding step of the different thickness rolling. However, when the plate width becomes excessive in the process of this tenter rolling, it is supplied from the steelmaking process. When the weight of the slab is less than the planned weight from the beginning, the product steel sheet of the thin-walled portion X that has been subjected to the secondary rolling can be obtained as planned, but the planned steel sheet is thicker than the thick-walled portion Y. Part of the product cannot be collected. For this reason, for example, when the thick portion Y is composed of only a product having a large unit weight, the yield is significantly reduced, and the thick portion Y is composed of a product that is highly urgent in terms of delivery date. If there is a relatively low urgency in the thin portion X, a highly urgent matter cannot be collected, and a product with a relatively low urgency can be collected. It was a narrow one.
【０００６】本発明は前記の問題を解決して異厚鋼板を
高歩留で製造出来、かつ、圧延の自由度を大幅に拡大す
ることを課題とするものである。An object of the present invention is to solve the above problems, to manufacture a steel sheet having a different thickness with a high yield, and to greatly expand the degree of freedom of rolling.
【０００７】[0007]
【課題を解決するための手段】本発明は上記課題を解決
するためになされたものであり、その手段１は、熱間の
被圧延鋼板を圧延して該鋼板長手方向に厚さの異なる異
厚鋼板を得るに際し、前記被圧延鋼板を厚さの厚い製品
鋼板に合わせて一次圧延して厚肉部を形成した後、厚さ
の薄い製品鋼板に合わせて二次圧延して薄肉部を形成す
る圧延を行って異厚鋼板を得る方法において、前記一次
圧延後の鋼板の側面の実断面積を求め、この求めた実側
断面積と予め設定した製品鋼板を得るに必要な予定側断
面積を比較し、その過不足に応じて前記二次圧延の圧延
長を調整する異厚鋼板の圧延方法である。Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and means 1 thereof is to roll a hot rolled steel sheet to obtain different thicknesses in the longitudinal direction of the steel sheet. In obtaining a thick steel plate, the rolled steel plate is first rolled to form a thick part by forming a thick product steel plate, and then secondly rolled to form a thin part in accordance with a thin product steel plate. In the method of obtaining a different thickness steel sheet by performing the rolling, the actual cross-sectional area of the side surface of the steel sheet after the primary rolling is obtained, and the obtained real-side cross-sectional area and the preset side cross-sectional area required to obtain the preset product steel sheet And the rolling length of the secondary rolling is adjusted according to the excess and deficiency.
【０００８】更に、手段２は、前記一次圧延後の厚肉部
の実側断面積と予定側断面積を比較した際、（実側断面
積）＜（予定側断面積）の場合には、予め設定している
厚肉部から得る製品鋼板と薄肉部から得る製品鋼板の製
造優先順位を比較し、製造優先順位の最も低い製品鋼板
を含む厚肉部又は薄肉部の長さを短くするように前記二
次圧延の圧延長を調整する手段１記載の異厚鋼板の圧延
方法である。Further, the means 2 compares the actual side sectional area of the thick-walled portion after the primary rolling with the planned side sectional area, and when (actual side sectional area) <(planned side sectional area), Compare the manufacturing priority of the product steel sheet obtained from the thick part and the product steel sheet obtained from the thin part set in advance, and shorten the length of the thick part or thin part including the product steel sheet with the lowest manufacturing priority. The method for rolling a steel sheet of different thickness according to means 1 for adjusting the rolling length of the secondary rolling.
【０００９】手段３は、前記実側断面積と前記予定側断
面積の差を求め、この差と前記製造優先順位が低く除外
する製品鋼板の側断面積から余剰側断面積を求め、この
余剰側断面積に応じて前記薄肉部を三次圧延して、該薄
肉部の板厚より薄い製品鋼板を得る手段２記載の異厚鋼
板の圧延方法である。The means 3 obtains the difference between the actual side cross-sectional area and the planned side cross-sectional area, obtains the surplus side cross-sectional area from the difference and the side cross-sectional area of the product steel sheet to be excluded because of the low manufacturing priority, and determines this surplus. A method for rolling a different thickness steel sheet according to means 2, wherein the thin portion is tertiary-rolled according to the side cross-sectional area to obtain a product steel sheet thinner than the thin portion.
【００１０】そして、手段４は、前記実側断面積と予定
側断面積を比較した際、（実側断面積）＞（予定側断面
積）の場合には、その差を求め、この差に応じて前記二
次圧延の圧延長を延長する手段１記載の異厚鋼板の圧延
方法である。Then, when comparing the actual side sectional area and the planned side sectional area, the means 4 finds the difference in the case of (actual side sectional area)> (planned side sectional area). Accordingly, the method for rolling a steel sheet of different thickness according to means 1 for extending the rolling length of the secondary rolling.
【００１１】手段５は、前記実側断面積と予定側断面積
が（実側断面積）＞（予定側断面積）の場合に、その差
を求め、この差に応じて前記二次圧延の圧延長を延長
し、その延長分三次圧延を行なって、前記薄肉部の板厚
より薄い製品鋼板を得る手段項４記載の異厚鋼板の圧延
方法である。The means 5 obtains a difference between the actual side sectional area and the planned side sectional area when (actual side sectional area)> (planned side sectional area), and the difference between the secondary rolling of the secondary rolling is determined according to the difference. 5. The rolling method for a different-thickness steel sheet according to claim 4, wherein the rolling length is extended and tertiary rolling is performed for the extension to obtain a product steel sheet thinner than the thin portion.
【００１２】本発明によれば、異厚鋼板の圧延は幅出し
圧延を完了して長さ方向の圧延に移行した段階で行なわ
れることから実績重量と予定重量との比較には厚みと長
さの積から求められる側断面積を用いれば良く、この長
さ方向の圧延である一次圧延後の鋼板側面の実側断面積
が不足して予定の製品鋼板を確保することが困難になっ
た場合には、予め決められた製品鋼板の優先順位、例え
ば製品鋼板の重量、納期に基づいて高位優先順位の製品
鋼板を救済するように二次圧延の圧延長を調整すること
により、従来のように常に厚肉部の製品のみの採取が不
能となることを防止するものである。According to the present invention, the rolling of the different thickness steel sheet is performed at the stage when the tenter rolling is completed and the rolling in the length direction is started, so that the thickness and the length can be compared with the actual weight and the planned weight. If the side cross-sectional area obtained from the product of the above is used, and the actual side cross-sectional area of the side surface of the steel sheet after primary rolling, which is rolling in the length direction, is insufficient, it becomes difficult to secure the planned product steel sheet. In the conventional method, by adjusting the rolling length of the secondary rolling so as to relieve the product steel sheet having a higher priority based on a predetermined priority order of the product steel sheet, for example, the weight of the product steel sheet and the delivery date. It is intended to prevent the inability to always collect only the thick-walled product.
【００１３】更には、除外する製品により鋼板に余剰が
生じた場合には、その余剰側断面積から予定外の製品鋼
板を採取することから、歩留落ちを最小限で回避するこ
とが可能となる。Further, when a steel sheet has a surplus due to a product to be excluded, an unplanned product steel sheet is sampled from the surplus side sectional area, so that the yield loss can be minimized. Become.
【００１４】また、一次圧延の鋼板側断面積が過多であ
る場合にも、二次圧延の製品鋼板採取確率が向上する
他、余剰側断面積が予定外の製品鋼板に置換されること
で異形鋼板の大幅な歩留向上が可能となる。Further, even when the steel sheet side cross-sectional area of the primary rolling is excessive, the probability of collecting the product steel sheet of the secondary rolling is improved, and the surplus side cross-sectional area is replaced with an unplanned product steel sheet, which causes deformation. It is possible to significantly improve the yield of steel sheets.
【００１５】[0015]
【発明の実施の形態】以下に、本発明の実施の形態につ
いて、図面を参照して詳しく説明する。本例は鋳造した
スラブを圧延ロール１により板厚の厚い複数の製品鋼板
を得るための厚肉部Ｙを形成する一次圧延を行い、次
に、同圧延ロール１により板厚の薄い複数の製品鋼板を
得るための薄肉部Ｘを形成する二次圧延を行なうことで
異厚鋼板を得るものである。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. In this example, the cast slab is subjected to primary rolling to form a thick portion Y for obtaining a plurality of product steel sheets having a large plate thickness by a rolling roll 1, and then a plurality of products having a thin plate thickness are produced by the rolling roll 1. A different thickness steel plate is obtained by performing secondary rolling to form a thin portion X for obtaining a steel plate.
【００１６】以下に本実施の形態の圧延方法の制御系を
図１を参照して説明する。図１中、１は圧延ロール、２
は鋼板の板幅を測定する板幅計、３は圧延ロール１の駆
動軸端に設けたミルパルス検出器、５はテーブルロール
４の駆動軸端に設けたテーブルパルス検出器、６はバッ
クアップロール１a に設け、圧延ロール１に掛かる圧延
荷重を測定するロ−ドセル等の圧延荷重計、７は測長演
算装置、８はテーブルロール４の上方に設け、鋼板の厚
みを測定する厚み計、９はプロセス計算機である。The control system of the rolling method according to this embodiment will be described below with reference to FIG. In FIG. 1, 1 is a rolling roll, 2
Is a width gauge for measuring the plate width of the steel plate, 3 is a mill pulse detector provided at the drive shaft end of the rolling roll 1, 5 is a table pulse detector provided at the drive shaft end of the table roll 4, and 6 is a backup roll 1a. , A rolling load meter such as a load cell for measuring the rolling load applied to the rolling roll 1, 7 is a length measuring device, 8 is a measuring gauge provided above the table roll 4, and a thickness gauge for measuring the thickness of the steel plate, and 9 are It is a process calculator.
【００１７】次に前記異厚鋼板を得るための制御方法を
説明する。この異厚鋼板を得るためには、先ず、前記一
次圧延を完了した時点で、この鋼板の先端と後端の両ク
ロップ部を除く部分の鋼板側面の断面積を求める必要が
ある。このため、圧延荷重計６からの圧延荷重測定値に
よって圧延ロール１が厚肉部Ｙを形成するための一次圧
延の最終パスを開始したことを測長演算装置７が検知す
ると、測長演算装置７はミルパルス検出器３からのミル
パルスのカウントを開始する。そして、板幅計２が測定
した圧延後の板幅測定値を入力し、この測定値から鋼板
先部の幅が予め設定した製品採取可能な有効幅となった
事を認識するまでの間の前記ミルパルスカウント数Ｃf
を記憶する。更に、この記憶したミルパルスカウント数
Ｃf と予め設定した先進率Ｆ、ミルパルスの単位長さ
（mm／パルス）Ｉf 、圧延ロール１のセンター（ミルセ
ンター）ラインＣと板幅計２間の距離Ｒとにより下式
（１）により、図４に示す鋼板先端のクロップ長ΔＬf
を求めて記憶する。Next, a control method for obtaining the different thickness steel sheet will be described. In order to obtain this steel sheet of different thickness, first, at the time when the primary rolling is completed, it is necessary to determine the cross-sectional area of the side surface of the steel sheet at the portion excluding both the front and rear crop portions. Therefore, when the length measurement calculation device 7 detects that the rolling roll 1 has started the final pass of the primary rolling for forming the thick portion Y based on the rolling load measurement value from the rolling load meter 6, the length measurement calculation device is detected. 7 starts counting the mill pulses from the mill pulse detector 3. Then, the measured value of the strip width after rolling measured by the strip width meter 2 is input, and until it is recognized that the width of the front end of the steel plate becomes the preset effective width for product sampling from the measured value. Mill pulse count number Cf
Memorize Further, the stored mill pulse count number Cf, a preset advance rate F, a unit length (mm / pulse) If of the mill pulse, a center (mill center) line C of the rolling roll 1 and a distance R between the strip width gauges 2. With the following formula (1), the crop length ΔLf at the steel plate tip shown in FIG.
Seek and memorize.
【００１８】
ΔＬf ＝Ｃf ・（１＋Ｆ）・Ｉf −Ｒ （１）
更に、測長演算装置７は圧延荷重計６からの信号により
圧延の終了を検知すると、ミルパルス検出器３からのミ
ルパルスのカウントを停止し、圧延開始時点から圧延終
了時点までのミルパルスカウント数Ｃm を記憶する。こ
の記憶したミルパルスカウント数Ｃm と予め設定した先
進率Ｆ、ミルパルスの単位長さ（mm／パルス）Ｉm によ
り下式（２）により一次圧延後の鋼板の全長Ｌを求めて
記憶する。ΔLf = Cf · (1 + F) · If−R (1) Further, when the length measurement computing unit 7 detects the end of rolling by the signal from the rolling load meter 6, the mill pulse detector 3 counts the mill pulses. The mill pulse count number Cm from the start of rolling to the end of rolling is stored. The total length L of the steel sheet after the primary rolling is obtained and stored by the following equation (2) from the stored mill pulse count number Cm, the preset advance rate F, and the unit length (mm / pulse) Im of the mill pulse.
【００１９】
Ｌ＝Ｃm ・（１＋Ｆ）・Ｉm （２）
また、圧延荷重計６からの圧延荷重測定値により測長演
算装置７が圧延の終了を検知すると、該測長演算装置７
はテーブルパルス検出器５からのテーブルパルスのカウ
ントを開始し、そして、板幅計２からの板幅測定値によ
り圧延後の鋼板後部の板幅が予め設定した製品採取可能
な有効幅以下になった事を認識すると前記テーブルパル
スのカウントを停止し、その間のテーブルパルスカウン
ト数Ｃtを記憶する。このテーブルパルスカウント数Ｃt
と予め設定した前記テーブルパルスの単位長さ（mm／
パルス）Ｉt 、前記ミルセンターラインＣと板幅計２間
の距離Ｒとにより、下式（３）により図４に示す鋼板後
端のクロップ長ΔＬt を求めて記憶する。L = Cm (1 + F) Im (2) Further, when the length measurement computing device 7 detects the end of rolling from the rolling load measurement value from the rolling load meter 6, the length measurement computing device 7 is detected.
Starts counting the table pulses from the table pulse detector 5, and the plate width measurement value from the plate width meter 2 causes the plate width at the rear part of the rolled steel plate to fall below a preset effective width for product sampling. When it is recognized that the table pulse count is stopped, the table pulse count number Ct during that time is stored. This table pulse count number Ct
And the preset unit length of the table pulse (mm /
(Pulse) It and the distance R between the mill center line C and the strip width gauge 2 and the crop length ΔLt at the rear end of the steel plate shown in FIG.
【００２０】ΔＬt ＝Ｃt ×Ｉt −Ｒ （３）
このようにして求めた鋼板先端のクロップ長ΔＬf 、鋼
板の全長Ｌ、鋼板後端のクロップ長ΔＬt から、鋼板先
部の有効幅位置から鋼板後部の有効幅位置までの有効鋼
板長さＬa を下式（４）により求める。ΔLt = Ct × It-R (3) From the crop length ΔLf of the steel plate tip, the total length L of the steel plate, and the crop length ΔLt of the steel plate rear end thus obtained, from the effective width position of the steel plate front part to the steel plate rear part The effective steel plate length La up to the effective width position of is calculated by the following equation (4).
【００２１】
Ｌa ＝Ｌ―（ΔＬf ＋ΔＬt ） （４）
また、測長演算装置７は厚み計８で測定した一次圧延後
の鋼板の実績板厚値ｔo を入力して記憶しており、前記
式（４）で一次圧延後の有効鋼板長さＬa が求められる
と、この鋼板長さＬa と測定実績板厚ｔo を積算して鋼
板側面の実測断面積Ｓa を求めて、上位のプロセス計算
機９に入力して記憶する。La = L- (ΔLf + ΔLt) (4) Further, the length measurement calculation device 7 inputs and stores the actual plate thickness value to of the steel plate after primary rolling measured by the thickness gauge 8 and storing it. When the effective steel plate length La after the primary rolling is obtained in (4), the steel plate length La and the actual measurement plate thickness to are integrated to obtain the actually measured cross-sectional area Sa of the steel plate side surface, and the upper process computer 9 is determined. Enter and memorize.
【００２２】このプロセス計算機９における演算処理を
図２を参照して説明する。予め、この異厚鋼板の厚肉部
Ｙの予定長さＬ01とその板厚ｔ01及び薄肉部Ｘの予定長
さＬ02とその板厚ｔ02により下式（５）により予定側断
面積Ｓ0 を求めておき、この予定側断面積Ｓ0 と前記入
力した鋼板実測断面積Ｓa を比較する（Ｓ１）（Ｓ
２）。The arithmetic processing in this process computer 9 will be described with reference to FIG. In advance, the expected side sectional area S0 is calculated by the following equation (5) from the planned length L01 of the thick portion Y of the different thickness steel plate and its plate thickness t01 and the planned length L02 of the thin portion X and its plate thickness t02. Then, the planned side sectional area S0 is compared with the input steel plate actual measured sectional area Sa (S1) (S
2).
【００２３】
Ｓ0 ＝ｔ01・Ｌ01＋ｔ02・Ｌ02 （５）
この比較結果がＳａ＜Ｓ0 の場合においては、予じめ設
定した二次圧延長Ｌ02で圧延を行なうと厚肉部Ｙの長さ
Ｌ01が（Ｓ0 ―Ｓa ）／ｔ01だけ不足することから薄肉
部Ｘの圧延長を修正する必要がある。S0 = t01.L01 + t02.L02 (5) When the comparison result is Sa <S0, the length L01 of the thick portion Y becomes ( Since there is a shortage of S0-Sa) / t01, it is necessary to correct the rolling length of the thin portion X.
【００２４】このため、この異厚鋼板から得ようとする
各製品鋼板の重量、納期、等を考慮して圧延する優先順
位の最も低い製品鋼板を判定し（例えば、圧延の歩留を
優先する場合には、重量の大きい順に優先順位を付け、
納期を優先する場合には、納期の短い順番に優先順位を
付ける。）（Ｓ４）、この優先順位の最も低い製品を含
むのが厚肉部Ｙか薄肉部Ｘを判定する。Therefore, the product steel sheet having the lowest priority for rolling is determined in consideration of the weight, delivery time, etc. of each product steel sheet to be obtained from this different thickness steel sheet (for example, the yield of rolling is prioritized). In this case, prioritize the items in descending order of weight,
When prioritizing the delivery date, prioritize the items in ascending order of the delivery date. ) (S4), it is determined whether the product having the lowest priority is the thick wall portion Y or the thin wall portion X.
【００２５】そして、薄肉部Ｘ側に製造優先順位の最も
低い製品が組み込まれていた場合は（Ｓ５）、先ず、こ
の不足する断面積（Ｓ0 ―Ｓa ）だけ二次圧延の圧延長
さＬ02a を短くする必要があるため、この二次圧延の圧
延長Ｌ02a を下式（６）で求める（Ｓ６）。When the product having the lowest production priority is incorporated on the thin portion X side (S5), first, the rolling length L02a of the secondary rolling is set by the insufficient sectional area (S0-Sa). Since the length needs to be shortened, the rolling length L02a of this secondary rolling is calculated by the following equation (6) (S6).
【００２６】
Ｌ02a ＝Ｌ02−（Ｓ0 −Ｓa ）／ｔ02 （６）
次に、最も優先順位の低い製品、つまり、除外する製品
の側断面積をＳx とすると、除外製品側断面積Ｓx と不
足断面積（Ｓ0 −Ｓa ）の差を求め、この差｛Ｓx −
（Ｓ0 −Ｓa ）｝と採取予定の予定外製品の側断面積Ｓ
z を比較し、｛Ｓx −（Ｓ0 −Ｓa ）｝＞Ｓz であれ
ば、予定外製品を採取可能と判断し（Ｓ７）、下式
（７）により三次圧延の圧延長Ｌ03を求める（Ｓ８）。
前記式（６）に基づいて二次圧延した後、下式（７）で
求めた圧延長Ｌ03に従って薄肉部Ｘの三次圧延を行う。L02a = L02− (S0−Sa) / t02 (6) Next, if the side cross-sectional area of the product with the lowest priority, that is, the product to be excluded is Sx, the excluded product side cross-sectional area Sx and insufficient disconnection The difference between the areas (S0-Sa) is calculated, and this difference {Sx-
(S0-Sa)} and the side sectional area S of the unscheduled product to be collected
z is compared, and if {Sx- (S0-Sa)}> Sz, it is determined that an unplanned product can be collected (S7), and the rolling length L03 of the tertiary rolling is obtained by the following formula (7) (S8). .
After the secondary rolling based on the equation (6), the tertiary rolling of the thin portion X is performed according to the rolling length L03 obtained by the following equation (7).
【００２７】
Ｌ03＝｛Ｓx −（Ｓ0 −Ｓa ）｝／ｔ03 （７）
但し、ｔ03は予定外製品の板厚
逆に、｛Ｓx −（Ｓ0 −Ｓa ）｝＜Ｓz であれば、予定
外製品が取れないために、三次圧延は行わずに（Ｓ
９）、前記式（６）で求めた圧延長さＬ02a に従って二
次圧延のみを行う。L03 = {Sx- (S0-Sa)} / t03 (7) However, t03 is the plate thickness of the unplanned product, and if {Sx- (S0-Sa)} <Sz, the unplanned product is Therefore, the third rolling is not performed (S
9), only the secondary rolling is performed according to the rolling length L02a obtained by the above formula (6).
【００２８】また、厚肉部Ｙに最も優先順位の低い製品
が組み込まれていた場合には、その製品を除外すること
になり、その除外製品の断面積Ｓy とすると、その断面
積Ｓy から前記不足分（Ｓ0 −Ｓa ）を差し引いた断面
積だけ余剰が生じることから、その余剰断面積分だけ二
次圧延長を長くして薄肉部Ｘを延長し、更に、この薄肉
部Ｘを前記余剰断面積分だけ予定外製品を採取するため
に三次圧延することが好ましい。If the product having the lowest priority is incorporated in the thick portion Y, the product is excluded. If the cross-sectional area Sy of the excluded product is taken as the cross-sectional area Sy, Since a surplus is generated by the cross-sectional area obtained by subtracting the shortage (S0-Sa), the secondary rolling length is lengthened by the surplus cross-section integration to extend the thin-walled portion X, and the thin-walled portion X is further integrated with the surplus cross-sectional area. It is preferable to carry out tertiary rolling only to collect unscheduled products.
【００２９】即ち、最も優先順位の低い製品を厚肉部Ｙ
から除外するために、該厚肉部Ｙには除外製品の断面積
Ｓy と前記不足分（Ｓ0 −Ｓa ）の差だけの余剰面積が
生じる。That is, the product with the lowest priority is given to the thick portion Y.
In order to exclude from the above, the thick portion Y has a surplus area corresponding to the difference between the cross-sectional area Sy of the excluded product and the shortage (S0-Sa).
【００３０】このため、余剰面積｛Ｓy −（Ｓ0 −Ｓa
）｝を算定し（Ｓ１０）、この余剰面積｛Ｓy −（Ｓ0
−Ｓa ）｝と予定外製品の側断面積Ｓz を比較し、Ｓz
＜｛Ｓy −（Ｓ0 −Ｓa ）｝であれば（Ｓ１１）、予
定外製品を採取可能であると判断して、二次圧延長Ｌ02
a を下式（８）で求めると共に三次圧延長Ｌ03を下式
（９）により求める（Ｓ１２）（Ｓ１３）。Therefore, the surplus area {Sy- (S0-Sa
)} Is calculated (S10), and this surplus area {Sy- (S0
-Sa)} and the side sectional area Sz of the unplanned product are compared, and Sz
If <{Sy- (S0-Sa)} (S11), it is determined that the unscheduled product can be collected, and the secondary rolling length L02
a is obtained by the following equation (8) and the tertiary rolling length L03 is obtained by the following equation (9) (S12) (S13).
【００３１】
Ｌ02a ＝Ｌ02＋｛Ｓy −（Ｓ0 −Ｓa ）｝／ｔ02 （８）
Ｌ03＝｛Ｓy −（Ｓ0 −Ｓa ）｝／ｔ03 （９）
この様にして求めた二次圧延長Ｌ02a に基づいて二次圧
延を行い、その後、前記求めた三次圧延長Ｌ03に基づい
て三次圧延を行う。L02a = L02 + {Sy− (S0−Sa)} / t02 (8) L03 = {Sy− (S0−Sa)} / t03 (9) Based on the secondary rolling length L02a thus obtained Secondary rolling is performed, and then tertiary rolling is performed based on the obtained tertiary rolling length L03.
【００３２】一方、余剰面積｛Ｓy −（Ｓ0 −Ｓa ）｝
と予定外製品の側断面積Ｓx がＳz｛Ｓy −（Ｓ0 −Ｓa
）｝＞Ｓx である場合には、余剰分から予定外製品の
採取が不可能であると判断して、上記式（８）で求めた
圧延長Ｌ02a に基づいて二次圧延することが好ましい
（Ｓ１４）。On the other hand, the surplus area {Sy- (S0-Sa)}
And the side sectional area Sx of the unplanned product is Sz {Sy- (S0-Sa
)}> Sx, it is judged that unscheduled products cannot be collected from the surplus, and it is preferable to carry out secondary rolling based on the rolling length L02a obtained by the above equation (8) (S14). ).
【００３３】また、前記の様に、異厚鋼板の予定側断面
積Ｓ0 と実測側断面積Ｓa を比較した結果、Ｓa ＞Ｓ0
の場合には、先ず、余剰面積（Ｓa −Ｓ0 ）で予定外の
製品が採取可能であるか否かを判断する（Ｓ１５）。Further, as described above, as a result of comparing the planned side sectional area S0 of the different thickness steel sheet and the actually measured side sectional area Sa, Sa> S0
In the case of, first, it is determined whether or not an unplanned product can be collected in the surplus area (Sa-S0) (S15).
【００３４】つまり、余剰面積（Ｓa −Ｓ0 ）と予定外
製品の断面積Ｓz を比較し、（Ｓa−Ｓ0 ）＞Ｓz であ
れば、この余剰分から予定外製品の採取が可能であると
判断し、下式（１０）で二次圧延長Ｌ02a を求めると共
に下式（１１）により三次圧延長Ｌ03を求め（Ｓ１
６）、この求めた二次圧延長Ｌ02a に基づいて二次圧延
を行って薄肉部Ｘを形成し、その後、この薄肉部Ｘを前
記求めた三次圧延長Ｌ03に基づいて三次圧延を行う。That is, the surplus area (Sa-S0) is compared with the cross-sectional area Sz of the unscheduled product. If (Sa-S0)> Sz, it is judged that the unscheduled product can be collected from this surplus. Then, the secondary rolling length L02a is obtained by the following equation (10), and the tertiary rolling length L03 is obtained by the following equation (11) (S1
6) Then, the secondary rolling is performed based on the obtained secondary rolling length L02a to form the thin portion X, and then the thin portion X is subjected to the tertiary rolling based on the tertiary rolling length L03 obtained above.
【００３５】
Ｌ02a ＝Ｌ02＋（Ｓ0 −Ｓa ）／ｔ02 （１０）
Ｌ03＝（Ｓ0 −Ｓa ）／ｔ03 （１１）
また、逆にＳa ＜Ｓ0 の場合には、予定外の製品が採取
不可能であるため、下式（１２）で二次圧延長Ｌ02a を
求め、これに従って二次圧延を行う事により、厚肉部Ｙ
及び薄肉部Ｘを均等に延長して製品採取確率を向上させ
ることが好ましい（Ｓ１７）。L02a = L02 + (S0-Sa) / t02 (10) L03 = (S0-Sa) / t03 (11) On the contrary, when Sa <S0, unplanned products cannot be collected. Therefore, the secondary rolling length L02a is obtained by the following formula (12), and the secondary rolling is performed according to this to obtain the thick portion Y
And it is preferable to extend the thin portion X evenly to improve the product collection probability (S17).
【００３６】
Ｌ02a ＝Ｌ02＋（Ｓ0 −Ｓa ）／２・ｔ02 （１２）
上記式（１２）に基づく圧延は余剰面積（Ｓa ―Ｓ0 ）
を厚肉部Ｙ及び薄肉部Ｘに均等に配分することを前提と
しているが、鋼板に組み合わされた製品の優先順位等を
考慮して、配分比率を変化させても良い。L02a = L02 + (S0-Sa) / 2t02 (12) Rolling based on the above formula (12) produces a surplus area (Sa-S0).
Is assumed to be equally distributed to the thick portion Y and the thin portion X, but the distribution ratio may be changed in consideration of the priority order of the products combined with the steel sheet.
【００３７】[0037]
【発明の効果】以上のように、本発明によれば、スラブ
の重量不足あるいは過剰な幅出し圧延等の原因で、予定
していた製品鋼板を採取することが不能となった場合
に、常に厚肉部のみに組み込まれている製品鋼板が採取
不能となる事が防止されるために圧延の自由度が拡大
し、更に、優先順位の高い成品が採取不能となる不具合
を回避することが可能となり圧延歩留りの低下を極力防
止する事が可能となる。As described above, according to the present invention, when it becomes impossible to extract the intended product steel sheet due to insufficient weight of the slab or excessive tenter rolling, etc. It is possible to prevent the product steel sheet incorporated only in the thick wall part from being uncollectible, which increases the degree of freedom of rolling, and it is possible to avoid the problem that high-priority products cannot be collected. Therefore, it becomes possible to prevent the reduction of rolling yield as much as possible.
【図１】本発明の実施の形態を示すシステム構成図。FIG. 1 is a system configuration diagram showing an embodiment of the invention.
【図２】本発明の実施の形態を示すフロ−チャ−ト。FIG. 2 is a flow chart showing an embodiment of the present invention.
【図３】異厚鋼鈑の圧延手順を示す図。FIG. 3 is a diagram showing a rolling procedure of a steel plate of different thickness.
【図４】一次圧延後の鋼板を示す図。FIG. 4 is a diagram showing a steel sheet after primary rolling.
１：圧延ロール、 ２：板幅計 ３：ミルパルス検出器、 ４：テーブルロール ５：テーブルパルス検出器、 ６：圧延荷重計 ７：測長演算装置、 ８：厚み計 ９：プロセス計算機 Ｘ：薄肉部、 Ｙ：厚肉部 1: Rolling roll, 2: Plate width gauge 3: Mill pulse detector, 4: Table roll 5: Table pulse detector, 6: Rolling load cell 7: Length measuring arithmetic unit, 8: Thickness gauge 9: Process computer X: thin-walled part, Y: thick-walled part
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭48−38262（ＪＰ，Ａ) 特開 昭60−61106（ＪＰ，Ａ) 特開 昭48−60059（ＪＰ，Ａ) 特開 昭48−38261（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B21B 1/00 - 11/00 ─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-48-38262 (JP, A) JP-A-60-61106 (JP, A) JP-A-48-60059 (JP, A) JP-A-48- 38261 (JP, A) (58) Fields surveyed (Int.Cl. 7 , DB name) B21B 1/00-11/00
Claims (5)
方向に厚さの異なる異厚鋼板を得るに際し、前記被圧延
鋼板を厚さの厚い製品鋼板に合わせて一次圧延して厚肉
部を形成した後、厚さの薄い製品鋼板に合わせて二次圧
延して薄肉部を形成する圧延を行って異厚鋼板を得る方
法において、前記一次圧延後の鋼板の側面の実断面積を
求め、この求めた実側断面積と予め設定した製品鋼板を
得るに必要な予定側断面積を比較し、その過不足に応じ
て前記二次圧延の圧延長を調整することを特徴とする異
厚鋼板の圧延方法。1. When rolling a hot rolled steel sheet to obtain different thickness steel sheets having different thicknesses in the longitudinal direction of the steel sheet, the steel sheet to be rolled is primarily rolled to a thickness of a product steel sheet having a large thickness. In the method of obtaining a different thickness steel sheet by performing rolling to form a thin portion by secondary rolling in accordance with a thin product steel sheet after forming the thin portion, the actual cross-sectional area of the side surface of the steel sheet after the primary rolling. It is characterized in that the obtained actual side cross-sectional area is compared with the predetermined side cross-sectional area required to obtain a preset product steel sheet, and the rolling length of the secondary rolling is adjusted according to the excess or deficiency. Rolling method for steel sheets with different thickness.
予定側断面積を比較した際、（実側断面積）＜（予定側
断面積）の場合には、予め設定している厚肉部から得る
製品鋼板と薄肉部から得る製品鋼板の製造優先順位を比
較し、製造優先順位の最も低い製品鋼板を含む厚肉部又
は薄肉部の長さを短くするように前記二次圧延の圧延長
を調整することを特徴とする請求項１記載の異厚鋼板の
圧延方法。2. When comparing the actual side cross-sectional area of the thick-walled portion after the primary rolling with the planned side cross-sectional area, if (actual side cross-sectional area) <(planned side cross-sectional area), it is set in advance. Compare the manufacturing priority of the product steel sheet obtained from the thick part and the product steel sheet obtained from the thin part, and reduce the length of the thick part or the thin part including the product steel sheet with the lowest production priority. The method for rolling a steel sheet of different thickness according to claim 1, wherein the rolling length of the rolling is adjusted.
を求め、この差と前記製造優先順位が低く除外する製品
鋼板の側断面積から余剰側断面積を求め、この余剰側断
面積に応じて前記薄肉部を三次圧延して、該薄肉部の板
厚より薄い製品鋼板を得ることを特徴とする請求項２記
載の異厚鋼板の圧延方法。3. A surplus side sectional area is obtained from the difference between the actual side sectional area and the planned side sectional area, and the surplus side sectional area is obtained from the difference and the side sectional area of the product steel sheet to be excluded due to the low manufacturing priority. The method for rolling a steel sheet of different thickness according to claim 2, wherein the thin-walled portion is tertiary-rolled according to the area to obtain a product steel sheet thinner than the thin-walled portion.
た際、（実側断面積）＞（予定側断面積）の場合には、
その差を求め、この差に応じて前記二次圧延の圧延長を
延長することを特徴とする請求項１記載の異厚鋼板の圧
延方法。4. When comparing the actual side sectional area and the planned side sectional area, when (actual side sectional area)> (planned side sectional area),
The method for rolling different thickness steel sheets according to claim 1, wherein the difference is obtained and the rolling length of the secondary rolling is extended according to the difference.
断面積）＞（予定側断面積）の場合に、その差を求め、
この差に応じて前記二次圧延の圧延長を延長し、その延
長分三次圧延を行なって、前記薄肉部の板厚より薄い製
品鋼板を得ることを特徴とする請求項４記載の異厚鋼板
の圧延方法。5. The difference between the actual side sectional area and the planned side sectional area is (actual side sectional area)> (planned side sectional area),
The steel sheet of different thickness according to claim 4, wherein the rolled length of the secondary rolling is extended according to the difference, and the third rolling is performed by the extended amount to obtain a product steel sheet thinner than the sheet thickness of the thin portion. Rolling method.
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|---|---|---|---|
| JP31502897A JP3520188B2 (en) | 1997-11-17 | 1997-11-17 | Rolling method of different thickness steel plate |
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|---|---|---|---|
| JP31502897A JP3520188B2 (en) | 1997-11-17 | 1997-11-17 | Rolling method of different thickness steel plate |
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| Publication Number | Publication Date |
|---|---|
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| JP3520188B2 true JP3520188B2 (en) | 2004-04-19 |
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