JP2017127900A - Rolling method of deformed steel plate - Google Patents

Rolling method of deformed steel plate Download PDF

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JP2017127900A
JP2017127900A JP2016010580A JP2016010580A JP2017127900A JP 2017127900 A JP2017127900 A JP 2017127900A JP 2016010580 A JP2016010580 A JP 2016010580A JP 2016010580 A JP2016010580 A JP 2016010580A JP 2017127900 A JP2017127900 A JP 2017127900A
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length
rolling
taper
extra length
thickness
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JP6428660B2 (en
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達也 大嶋
Tatsuya Oshima
達也 大嶋
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JFE Steel Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a rolling method capable of obtaining a desirable excessive length part upon completion of final taper pass in rolling including taper pass of two or more passes.SOLUTION: In a rolling method of a deformed steel plate which has different thickness in the longitudinal direction and has excessive length parts on both ends, ratio (Lt/Lb) of lengths of the excessive length parts of both ends is determined beforehand, taper passes for changing a roll gap during the rolling are performed by two or more passes, the taper passes satisfying equation (1) and equation (2) are performed with respect to each excessive length part on each taper pass, and the ratio (Lt/Lb) of lengths of the excessive length parts after final taper pass is set as the value determined beforehand; Lt'=Lt ht/ht'...(1), Lb'=Lb hb/hb'...(2). Therein, the length of the excessive length part before the taper pass is Lx' and the thickness is hx' and the length of the excessive length part after the taper pass is Lx and the thickness is hx. Further, t and b corresponding to x is a mark for differentiate between the excessive length parts of both ends.SELECTED DRAWING: Figure 3

Description

本発明は、厚板圧延において、長手方向で厚さの異なる異型鋼板の圧延方法に関する。   The present invention relates to a method for rolling a deformed steel sheet having a different thickness in the longitudinal direction in thick plate rolling.

厚板の製造に当たっては、１枚のスラブに、同じ板厚となる複数の製品厚板を割り当てて圧延するのが一般的である。同じ板厚の製品厚板を割り当てたスラブにおいて、被圧延材の切断精度のバラツキ、圧延精度のバラツキの結果、必要な製品厚板の長さが確保できない場合がある。このような場合、一般的には最終切断した製品厚板の長さ不足で不合格となる。そこで、被圧延材のトップ端およびボトム端に余長部を付与することで予め歩留を低く設定すると、前記長さ不足による不合格率を低減できる。歩留と被圧延材の長さ不足による不合格率はトレードオフの関係であるため、一般的にはトータルロスが最小となるような歩留設定をしている。   In the production of a thick plate, it is common to assign and roll a plurality of product thick plates having the same plate thickness to one slab. In a slab to which product plates having the same plate thickness are assigned, there are cases where the required product plate length cannot be ensured as a result of variations in the cutting accuracy of the material to be rolled and variations in the rolling accuracy. In such a case, it is generally rejected due to insufficient length of the finally cut product plank. Then, if the yield is set low beforehand by providing extra length portions at the top end and the bottom end of the material to be rolled, the rejection rate due to the insufficient length can be reduced. Since the yield and the failure rate due to insufficient length of the material to be rolled are in a trade-off relationship, generally the yield is set such that the total loss is minimized.

製品厚板の組み合わせの自由度を増すことや、ＬＰ鋼板を製造するため、長手方向で被圧延材の板厚が異なるように圧延する異厚圧延（テーパーパス）が行われている。テーパーパスにおいても、所望の製品が採取できるように適切な余長部を確保する必要がある。   In order to increase the degree of freedom of combination of product thick plates and to produce LP steel plates, different thickness rolling (taper path) is performed in which rolling is performed so that the thickness of the material to be rolled differs in the longitudinal direction. Even in the tapered path, it is necessary to secure an appropriate extra length so that a desired product can be collected.

下記特許文献１において、長手方向の予定断面積と実側断面積の比較に基づいて余長部を計算する技術が提案された。しかし、実際の圧延の誤差による余長部の長さ不足が発生する問題がある。そこで、下記特許文献２において、厚肉部形成時に演算した前記厚肉部の実側断面積に基づいて薄肉部の余裕長を演算し、当該薄肉部の余裕長に応じて前記厚肉部及び前記薄肉部に余剰側断面積が配分されるように計算する技術が公開されている。   In the following Patent Document 1, a technique for calculating a surplus portion based on a comparison between a planned cross-sectional area in the longitudinal direction and an actual cross-sectional area has been proposed. However, there is a problem in that the length of the surplus portion is insufficient due to an actual rolling error. Therefore, in Patent Document 2 below, the margin length of the thin portion is calculated based on the actual cross-sectional area of the thick portion calculated at the time of forming the thick portion, and the thick portion and the thick portion according to the margin length of the thin portion, A technique for calculating so that the surplus side cross-sectional area is distributed to the thin portion is disclosed.

特開平１１−１４７１０２号公報JP 11-147102 A 国際公開ＷＯ２０１４／１５６０４５号公報International Publication WO2014 / 156045

特許文献１〜２に開示の技術においては、圧延中にロールギャップを変更するテーパーパス（特許文献１〜２では「二次圧延」と記載）が１パス分の余長部計算を行っている。確かに、テーパーパスが１パスのみという制限下であれば、上記特許文献１〜２に開示の技術により求めた余長部に基づき異厚圧延をすればよい。   In the techniques disclosed in Patent Documents 1 and 2, a taper path (described as “secondary rolling” in Patent Documents 1 and 2) that changes the roll gap during rolling performs extra length calculation for one pass. . Surely, if the taper path is under the restriction of only one path, different thickness rolling may be performed based on the surplus length portion obtained by the technique disclosed in Patent Documents 1 and 2 above.

しかし、一回のテーパーパスでは所望のテーパーが得られない場合、例えば圧肉部と薄肉部の板厚差が大きい場合やテーパー勾配が大きい場合等、２パス以上のテーパーパスが必要となる場合がある。橋梁支持物など異なる板厚の鋼材を組み合わせて設計するものにおいては、所望のテーパーを実現できれば材料ロスを小さくできる。   However, when a desired taper path cannot be obtained with a single taper pass, for example, when there is a large difference in plate thickness between the compacted part and the thin part, or when the taper gradient is large, a taper path of two or more passes is required. There is. In what is designed by combining steel materials having different thicknesses such as bridge supports, material loss can be reduced if a desired taper can be realized.

２パス以上のテーパーパスにおいては、被圧延材のトップ端、ボトム端の厚さの変更を伴うことから、両端の余長部の長さが計算のとおりにならず、余長部の過不足を招くという課題がある。特に、板厚が厚い側の余長部はその長さが不足しがちであり、板厚が薄い側の余長部はその長さが過剰となりがちである。   In the taper pass of 2 passes or more, since the thickness of the top end and bottom end of the material to be rolled is accompanied, the length of the extra length at both ends is not as calculated, and the extra length is excessive or insufficient There is a problem of inviting. In particular, the extra length on the thick plate side tends to be short, and the extra length portion on the thin plate side tends to be excessive.

また、テーパーパスに限らず、圧延中に被圧延材の温度が低下することによる熱収縮も、両端の余長部の長さが計算のとおりにならない原因になっている。   In addition to the taper path, thermal shrinkage due to a decrease in the temperature of the material to be rolled during rolling also causes the lengths of the extra length portions at both ends not to be calculated.

例えば、上記熱収縮に関して、温度変化による寸法の変化βは線膨張係数αを用いて求めることができる。熱間圧延における温度変化Ｔ（℃）が２００℃、線膨張係数α＝１６．６×１０−６のとき、β＝１＋αＴを解くと、余長部の長さに約０．３％の誤差が生じうることとなる。 For example, regarding the thermal shrinkage, the dimensional change β due to temperature change can be obtained using the linear expansion coefficient α. When the temperature change T (° C.) in hot rolling is 200 ° C. and the linear expansion coefficient α = 16.6 × 10 −6 , when β = 1 + αT is solved, an error of about 0.3% is added to the length of the extra length portion. Can occur.

本発明は以上の事情に鑑みてなされたものであり、その課題は、２パス以上のテーパーパスを含む圧延において、最終テーパーパス完了時に所望の余長部を得ることができる異型鋼板の圧延方法を提供することである。   The present invention has been made in view of the above circumstances, and the subject thereof is a rolling method of a deformed steel sheet capable of obtaining a desired extra length portion when a final taper pass is completed in rolling including a taper pass of two passes or more. Is to provide.

本発明者は上記課題を解決するため鋭意研究を重ねた。その結果、余長部の体積を考慮することが重要であるとの知見を得るに至った。また、テーパーパスの実行において、熱の影響を低減できることをも見出した。
本発明者は更に研究を重ねて本発明を完成した。本発明の要旨は以下のとおりである。 This inventor repeated earnest research in order to solve the said subject. As a result, it has come to the knowledge that it is important to consider the volume of the extra length part. It has also been found that the influence of heat can be reduced in the execution of the taper pass.
The inventor has further studied and completed the present invention. The gist of the present invention is as follows.

［１］長手方向で厚さが異なり両端に余長部を有する異型鋼板の圧延方法であって、
前記両端の余長部の長さの比（Ｌｔ／Ｌｂ）を予め定め、
圧延中にロールギャップを変更するテーパーパスを２パス以上行い、
各テーパーパスで各余長部について式（１）および式（２）を満たすテーパーパスを行い、最終テーパーパス後の異型鋼板の余長部の長さの比（Ｌｔ／Ｌｂ）を前記予め定めた値とする、異型鋼板の圧延方法。
Ｌｔ’＝Ｌｔ・ｈｔ／ｈｔ’・・・（１）
Ｌｂ’＝Ｌｂ・ｈｂ／ｈｂ’・・・（２）
ここで、テーパーパス前の余長部の長さはＬｘ’、厚さはｈｘ’であり、テーパーパス後の余長部の長さはＬｘ、厚さはｈｘである。また、ｘに該当するｔおよびｂは両端の余長部を区別するための記号である。 [1] A method of rolling a deformed steel sheet having a different thickness in the longitudinal direction and having extra length portions at both ends,
A ratio (Lt / Lb) of the length of the extra length at both ends is determined in advance,
Perform two or more taper passes to change the roll gap during rolling,
A taper pass satisfying the equations (1) and (2) is performed for each extra length portion in each taper pass, and the length ratio (Lt / Lb) of the extra length portion of the deformed steel sheet after the final taper pass is determined in advance. A rolling method for a deformed steel sheet.
Lt ′ = Lt · ht / ht ′ (1)
Lb ′ = Lb · hb / hb ′ (2)
Here, the length of the extra length before the taper pass is Lx ′ and the thickness is hx ′, and the length of the extra length after the taper pass is Lx and the thickness is hx. Further, t and b corresponding to x are symbols for distinguishing the extra length portions at both ends.

本発明により、テーパーパスを２パス以上含む圧延スケジュールにおいても、異型鋼板の余長部をコントロールできるようになる。これにより、余長部の不足による不合格の低減に寄与出来る。また、余長部の過剰によるロス低減に寄与できる。   According to the present invention, even in a rolling schedule including two or more tapered passes, the extra length of the deformed steel plate can be controlled. Thereby, it can contribute to reduction of the rejection by the shortage of a surplus length part. Moreover, it can contribute to the loss reduction by excess of a surplus length part.

図１は、可逆式の圧延機１を説明する概略図である。FIG. 1 is a schematic diagram illustrating a reversible rolling mill 1. 図２は、異型鋼板の圧延の流れを説明する概略図である。FIG. 2 is a schematic diagram for explaining the flow of rolling of a deformed steel sheet. 図３は、異型鋼板の一例を示す概略図である。FIG. 3 is a schematic view showing an example of a deformed steel plate. 図４は、異型鋼板である、１方向ＬＰ鋼板の概略図である。FIG. 4 is a schematic view of a unidirectional LP steel plate, which is a deformed steel plate. 図５は、異型鋼板である、凸型２方向ＬＰ鋼板の概略図である。FIG. 5 is a schematic view of a convex bi-directional LP steel plate, which is a deformed steel plate. 図６は、異型鋼板である、凹型２方向ＬＰ鋼板の概略図である。FIG. 6 is a schematic view of a concave bi-directional LP steel plate, which is a deformed steel plate. 図７は、異型鋼板である、１方向２段ＬＰ鋼板の概略図である。FIG. 7 is a schematic view of a unidirectional two-stage LP steel plate, which is a modified steel plate.

本発明は、長手方向で厚さの異なる異型鋼板の圧延におけるテーパーパスにおいて、異型鋼板から製品となる部分を除いた余長部を、トップ端とボトム端に適切に配分するための圧延方法である。ここで、トップ端、ボトム端は、異型鋼板の両端部の区別のために呼び分けているに過ぎず、圧延方向におけるトップ、ボトムを意味するものではない。また、本発明のテーパーパスでは被圧延材の幅を変化させるためのサイジングプレスは行わない。以下に、本発明の実施形態を説明する。   The present invention relates to a rolling method for appropriately allocating a surplus length part excluding a part to be a product from a deformed steel sheet to a top end and a bottom end in a taper pass in rolling of a deformed steel sheet having a different thickness in the longitudinal direction. is there. Here, the top end and the bottom end are merely called for distinguishing both end portions of the deformed steel sheet, and do not mean the top and bottom in the rolling direction. Further, the sizing press for changing the width of the material to be rolled is not performed in the tapered path of the present invention. Hereinafter, embodiments of the present invention will be described.

図１は、スラブＳを圧延することで異型鋼板を得るための、可逆式の圧延機１を説明する概略図である。   FIG. 1 is a schematic diagram illustrating a reversible rolling mill 1 for obtaining a deformed steel sheet by rolling a slab S.

圧延機１は、上下のワークロール２と、上下のバックアップロール３とを備えている。上下のワークロール２間の開度は開度変更機構４によって調整される。開度変更機構４は、制御コントローラ５からの開度指令によって各パスでの開度を設定変更する。圧延時の圧延荷重はロードセル６によって検出され、その検出値が制御コントローラ５に出力される。符号９は、スラブＳを搬送するテーブルロールである。   The rolling mill 1 includes upper and lower work rolls 2 and upper and lower backup rolls 3. The opening between the upper and lower work rolls 2 is adjusted by the opening changing mechanism 4. The opening changing mechanism 4 changes the setting of the opening in each pass according to an opening command from the controller 5. The rolling load at the time of rolling is detected by the load cell 6, and the detected value is output to the controller 5. Reference numeral 9 denotes a table roll for conveying the slab S.

通常、スラブＳの幅出し圧延が終了した後に、厚み出しに移行する。   Usually, after the width rolling of the slab S is completed, the process shifts to thicknessing.

図２は、異型鋼板の一例について、圧延の流れを説明する概略図である。図２で示すように、異型鋼板の圧延は、先ず、上下のワークロール２によりスラブＳの一次圧延を行う。該一次圧延では、被圧延材Ｙはテーパーが形成されず、長手方向で厚さが揃っている。一次圧延のパス数は特に限定されず、適宜調整可能である。   FIG. 2 is a schematic diagram illustrating the flow of rolling for an example of a deformed steel sheet. As shown in FIG. 2, rolling of the deformed steel sheet is first performed by primary rolling of the slab S with the upper and lower work rolls 2. In the primary rolling, the material Y to be rolled is not tapered and has a uniform thickness in the longitudinal direction. The number of passes of the primary rolling is not particularly limited and can be adjusted as appropriate.

次いで、上下のワークロール２により、厚肉部Ｙ’と、薄肉部Ｘと、厚肉部Ｙ’及び薄肉部Ｘの間の段差部Ｚとを有する異厚鋼板１１を形成するテーパーパス（二次圧延）を行う。   Next, a tapered path (two pieces) forming the thick steel plate 11 having the thick part Y ′, the thin part X, and the step part Z between the thick part Y ′ and the thin part X by the upper and lower work rolls 2. Next rolling).

本発明では、テーパーパスを２パス以上行って異型鋼板を製造する。２パス以上のテーパーパスにおいては、被圧延材のトップ端、ボトム端の厚さの変更を伴うため、両端の余長部の制御が重要となる。そこで、本発明者は以下のように考えて、テーパーパスの圧延を工夫した。   In the present invention, the deformed steel sheet is manufactured by performing two or more taper passes. In a taper pass of two passes or more, since the thickness of the top end and the bottom end of the material to be rolled is changed, it is important to control the extra length portions at both ends. Therefore, the present inventor has devised the taper path rolling in the following manner.

余長部の長さは、スラブの体積から製品となる体積を引いたものを、厚さと幅で除算して求められる。こうして求められた余長部の長さを圧延スケジュール計算においてトップ端とボトム端へ配分する。このような所望の余長部を得ることができれば、余長部の不足による不合格を回避できる。しかし、厚みが長手方向で異なる異型鋼板では、この配分方法が自明ではない。そこで、本発明は、トップ端とボトム端への余長部の長さの配分方法を具体的に与える。   The length of the surplus portion is obtained by subtracting the product volume from the slab volume and dividing by the thickness and width. The length of the surplus part thus obtained is distributed to the top end and the bottom end in the rolling schedule calculation. If such a desired extra length portion can be obtained, a failure due to the lack of the extra length portion can be avoided. However, this distribution method is not self-evident in a deformed steel sheet having a different thickness in the longitudinal direction. Therefore, the present invention specifically provides a method of distributing the length of the extra length portion to the top end and the bottom end.

はじめに、製造される異型鋼板におけるトップ端とボトム端の各余長部の長さの比を設定する。次に、この余長部の長さの比と、トップ端とボトム端の厚さ・幅を用いて、それぞれの余長部の長さを決定する。これで圧延完了時（製造される異型鋼板）の余長部を決定できる。   First, the ratio of the length of each extra length part of the top end and the bottom end in the deformed steel sheet to be manufactured is set. Next, the length of each extra length is determined using the ratio of the length of the extra length and the thickness and width of the top end and the bottom end. Thereby, the extra length part at the time of completion of rolling (the deformed steel plate manufactured) can be determined.

ところで、圧延中にロールギャップを変更するテーパーパスが２パス以上ある場合、各テーパーパスにおけるトップ端とボトム端の余長部の長さの比は、圧延完了時の余長部の長さの比と必ずしも一致しない。そこで、余長部の体積は圧延の前後で変化しないことに注目し、各テーパーパスの余長部は以下の計算式で求める。   By the way, when there are two or more tapered paths for changing the roll gap during rolling, the ratio of the length of the extra length at the top end and the bottom end in each taper pass is the length of the extra length at the completion of rolling. Not necessarily consistent with the ratio. Therefore, paying attention to the fact that the volume of the extra length portion does not change before and after rolling, the extra length portion of each tapered path is obtained by the following calculation formula.

ある余長部の体積Ｖが与えられたとする。また、圧延完了時のトップ端の厚さをｈｔ、ボトム端の厚みをｈｂとする。また、幅は一定としＷとする。鋼板の圧延では、通常、圧延の前後で幅Ｗは一定とみなすことができる。以上の条件から、トップ端の余長部の長さＬｔとボトム端の余長部の長さＬｂは以下の式（１）、式（２）ようになる。ただし、Ｖ＝Ｖｔ（トップ端の余長部の体積）＋Ｖｂ（ボトム端の余長部の体積）である（図３参照）。トップ端とボトム端の余長部の長さの比はＬｔ／Ｌｂ＝ａ（一定値）とする。
Ｌｔ＝Ｖｔ／（Ｗ・ｈｔ）・・・（１）
Ｌｂ＝Ｖｂ／（Ｗ・ｈｂ）・・・（２）
圧延を完了する最終テーパーパスのひとつ前のテーパーパスが完了した時点（この時点を表す場合に「’」を付す）のトップ端の厚さをｈｔ’、ボトム端の厚さをｈｂ’として、トップ端の余長部の長さＬｔ’、ボトム端の余長部の長さＬｂ’を求める。いま、余長部の体積はＶｔ’、Ｖｂ’であり、余長部の長さは以下の式（３）、式（４）となる。
Ｌｔ’＝Ｖｔ’／（Ｗ・ｈｔ’）・・・（３）
Ｌｂ’＝Ｖｂ’／（Ｗ・ｈｂ’）・・・（４）
余長部の体積は圧延の前後で変化しないので、Ｖｔ＝Ｖｔ’、Ｖｂ＝Ｖｂ’である。したがって以下のように式を変換できる。
Ｌｔ’＝Ｖｔ’／（Ｗ・ｈｔ’）＝Ｖｔ／（Ｗ・ｈｔ’）＝Ｌｔ・Ｗ・ｈｔ／（Ｗ・ｈｔ’）＝Ｌｔ・ｈｔ／ｈｔ’・・・（５）
Ｌｂ’＝Ｖｂ’／（Ｗ・ｈｂ）＝Ｖｂ／（Ｗ・ｈｂ’）＝Ｌｂ・Ｗ・ｈｂ／（Ｗ・ｈｂ’）＝Ｌｂ・ｈｂ／ｈｂ’・・・（６）
２パス以上のテーパーパス全てでこの式（５）、（６）を満たす変形を順に行えば、各テーパーパスにおける余長部の長さを計算できる。そして、この余長部の長さと厚さのとおりにテーパーパスを行えば、圧延完了時において、Ｌｔ／Ｌｂ＝ａを得る事ができる。逆に見れば、Ｌｔ／Ｌｂ＝ａを得るため、圧延完了時の余長部の厚さ（製品厚板の厚さ）を利用し、ひとつ前のテーパーパス完了時において余長部が備えるべき長さや厚さを求めることができる。例えば、ひとつ前のテーパーパス完了時における余長部の長さを定めれば、ひとつ前のテーパーパス完了時における余長部の厚さが求まる。これを繰り返し、テーパーパスを２パス以上含む圧延スケジュールとすればよい。該圧延スケジュールに従った圧延を行えば、所望の余長部を有する異型鋼板を製造できる。 Assume that a volume V of a certain extra length is given. In addition, the thickness of the top end at the completion of rolling is ht, and the thickness of the bottom end is hb. The width is constant and W. In the rolling of a steel sheet, the width W can usually be considered constant before and after rolling. From the above conditions, the length Lt of the surplus length portion at the top end and the length Lb of the surplus length portion at the bottom end are expressed by the following equations (1) and (2). However, V = Vt (volume of the extra length portion at the top end) + Vb (volume of the extra length portion at the bottom end) (see FIG. 3). The ratio of the lengths of the extra lengths at the top end and the bottom end is Lt / Lb = a (a constant value).
Lt = Vt / (W · ht) (1)
Lb = Vb / (W · hb) (2)
The thickness of the top end at the time when the taper pass immediately before the final taper pass to complete the rolling is completed (“′” is added to indicate this time) is ht ′, and the thickness of the bottom end is hb ′. The length Lt ′ of the surplus length portion at the top end and the length Lb ′ of the surplus length portion at the bottom end are obtained. Now, the volume of the extra length portion is Vt ′ and Vb ′, and the length of the extra length portion is expressed by the following equations (3) and (4).
Lt ′ = Vt ′ / (W · ht ′) (3)
Lb ′ = Vb ′ / (W · hb ′) (4)
Since the volume of the surplus portion does not change before and after rolling, Vt = Vt ′ and Vb = Vb ′. Therefore, the expression can be converted as follows.
Lt ′ = Vt ′ / (W · ht ′) = Vt / (W · ht ′) = Lt · W · ht / (W · ht ′) = Lt · ht / ht ′ (5)
Lb ′ = Vb ′ / (W · hb) = Vb / (W · hb ′) = Lb · W · hb / (W · hb ′) = Lb · hb / hb ′ (6)
If the deformation satisfying the equations (5) and (6) is sequentially performed in all the tapered paths of two or more paths, the length of the extra length portion in each tapered path can be calculated. If a taper pass is performed according to the length and thickness of the extra length portion, Lt / Lb = a can be obtained at the time of completion of rolling. In other words, in order to obtain Lt / Lb = a, the thickness of the extra length portion at the time of completion of rolling (the thickness of the product thick plate) should be used, and the extra length portion should be provided at the completion of the previous taper pass. The length and thickness can be determined. For example, if the length of the surplus portion when the previous taper pass is completed is determined, the thickness of the surplus portion when the previous taper pass is completed can be obtained. This may be repeated to obtain a rolling schedule including two or more tapered passes. If rolling according to the rolling schedule is performed, a deformed steel sheet having a desired extra length can be produced.

本発明において、余長部の長さの配分計算は、製品の寸法、スラブ重量の実績を元に、プロセスコンピュータにて実施可能である。計算した余長部の長さは、下位のＰＬＣおよび圧下制御装置に設定され、下位の機器は余長部の厚さが変更されるまで、設定された余長部の長さになるよう、テーパーパスの制御を行えばよい。   In the present invention, the distribution calculation of the length of the surplus portion can be performed by a process computer based on the actual product dimensions and slab weight. The calculated length of the extra length part is set in the lower PLC and the reduction control device, and the lower equipment is set to the length of the extra length part until the thickness of the extra length part is changed. The taper path may be controlled.

本発明の異型鋼板は、図３に示すものの他、ＬＰ鋼板を含む。例えば、本発明は、図３〜図７に示すような様々な異型鋼板の製造に適用可能である。   The deformed steel sheet of the present invention includes LP steel sheets in addition to those shown in FIG. For example, the present invention is applicable to the manufacture of various deformed steel sheets as shown in FIGS.

以下に、本発明の実施例を説明する。本発明は、以下の実施例に限定されない。   Examples of the present invention will be described below. The present invention is not limited to the following examples.

図３に示す異型鋼板の製造を行った。まず、トップ端の余長部（厚さ１７．３ｍｍ）およびボトム端の余長部（厚さ１４．９ｍｍ）を予め決定した。即ち、達成すべきＬｔ／Ｌｂを予め定めた。   The deformed steel sheet shown in FIG. 3 was manufactured. First, a surplus length portion (thickness 17.3 mm) at the top end and a surplus length portion (thickness 14.9 mm) at the bottom end were determined in advance. That is, Lt / Lb to be achieved is determined in advance.

２パス以上となるテーパーパスのパス数を予め定め、上記式（５）および式（６）を利用して各テーパーパス後における余長部のサイズを決定した（テーパーパススケジュールの決定）。   The number of tapered paths that are two or more passes is determined in advance, and the size of the extra length portion after each tapered path is determined using the above formulas (5) and (6) (determination of the tapered path schedule).

スラブの幅出し圧延を行って製品厚板で要求される幅を確保し、更に１次圧延（厚み出し）を行った。   The slab was rolled out to ensure the width required for the product thick plate, and further subjected to primary rolling (thickening).

次に、上記テーパーパススケジュールに従ってテーパーパスを行ったところ、最終テーパーパス後において所望のテーパーを実現でき、かつ、トップ端およびボトム端において予め決定した余長部の長さを確保できた。即ち、予め定めたＬｔ／Ｌｂを実現できた。   Next, when a taper pass was performed according to the taper pass schedule, a desired taper could be realized after the final taper pass, and the lengths of the extra length portions determined in advance at the top end and the bottom end could be secured. That is, a predetermined Lt / Lb was realized.

なお、テーパーパスの開始から最終テーパーパスの終了までに、被圧延材の温度は低下したが、所望の余長部の長さを確保できた。即ち、テーパーパスのスケジュール設定において、従来問題となっていた熱収縮を考慮せずとも良好な結果を得ることができた。   Although the temperature of the material to be rolled decreased from the start of the taper pass to the end of the final taper pass, the desired extra length was ensured. That is, in the taper pass schedule setting, good results could be obtained without considering the heat shrinkage that has been a problem in the past.

１ 圧延機
２ ワークロール
３ バックアップロール
４ 開度変更機構
５ 制御コントローラ
６ ロードセル
９ スラブ
１１ 異厚鋼板 1 Rolling Mill 2 Work Roll 3 Backup Roll 4 Opening Change Mechanism 5 Controller 6 Load Cell 9 Slab 11 Different Thick Steel Plate

Claims (1)

長手方向で厚さが異なり両端に余長部を有する異型鋼板の圧延方法であって、
前記両端の余長部の長さの比（Ｌｔ／Ｌｂ）を予め定め、
圧延中にロールギャップを変更するテーパーパスを２パス以上行い、
各テーパーパスで各余長部について式（１）および式（２）を満たすテーパーパスを行い、最終テーパーパス後の異型鋼板の余長部の長さの比（Ｌｔ／Ｌｂ）を前記予め定めた値とする、異型鋼板の圧延方法。
Ｌｔ’＝Ｌｔ・ｈｔ／ｈｔ’・・・（１）
Ｌｂ’＝Ｌｂ・ｈｂ／ｈｂ’・・・（２）
ここで、テーパーパス前の余長部の長さはＬｘ’、厚さはｈｘ’であり、テーパーパス後の余長部の長さはＬｘ、厚さはｈｘである。また、ｘに該当するｔおよびｂは両端の余長部を区別するための記号である。 A method of rolling a deformed steel sheet having a different thickness in the longitudinal direction and having extra length portions at both ends,
A ratio (Lt / Lb) of the length of the extra length at both ends is determined in advance,
Perform two or more taper passes to change the roll gap during rolling,
A taper pass satisfying the equations (1) and (2) is performed for each extra length portion in each taper pass, and the length ratio (Lt / Lb) of the extra length portion of the deformed steel sheet after the final taper pass is determined in advance. A rolling method for a deformed steel sheet.
Lt ′ = Lt · ht / ht ′ (1)
Lb ′ = Lb · hb / hb ′ (2)
Here, the length of the extra length before the taper pass is Lx ′ and the thickness is hx ′, and the length of the extra length after the taper pass is Lx and the thickness is hx. Further, t and b corresponding to x are symbols for distinguishing the extra length portions at both ends.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09253710A (en) * 1996-03-26 1997-09-30 Sumitomo Metal Ind Ltd Manufacture of tapered plate
JP2004223537A (en) * 2003-01-21 2004-08-12 Nippon Steel Corp Method for manufacturing taper plate
JP2014000592A (en) * 2012-06-20 2014-01-09 Jfe Steel Corp Taper plate rolling method and method for manufacturing taper plate

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09253710A (en) * 1996-03-26 1997-09-30 Sumitomo Metal Ind Ltd Manufacture of tapered plate
JP2004223537A (en) * 2003-01-21 2004-08-12 Nippon Steel Corp Method for manufacturing taper plate
JP2014000592A (en) * 2012-06-20 2014-01-09 Jfe Steel Corp Taper plate rolling method and method for manufacturing taper plate

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