JP2013010126A - Method for manufacturing high-efficiency hot-rolled steel sheet - Google Patents

Method for manufacturing high-efficiency hot-rolled steel sheet Download PDF

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JP2013010126A
JP2013010126A JP2011145283A JP2011145283A JP2013010126A JP 2013010126 A JP2013010126 A JP 2013010126A JP 2011145283 A JP2011145283 A JP 2011145283A JP 2011145283 A JP2011145283 A JP 2011145283A JP 2013010126 A JP2013010126 A JP 2013010126A
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slab
width press
rough rolling
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JP5716573B2 (en
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Hiroshi Uchomae
洋 宇張前
Keiichiro Nishi
圭一郎 西
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JFE Steel Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a high-efficiency hot-rolled steel sheet by which production efficiency can be improved without causing great facility investment in a hot-rolling line where a breadthwise pressing apparatus is installed on the upstream side of a roughing mill (especially in a hot-rolling line where a breadthwise pressing apparatus is introduced later).SOLUTION: The total (B+C) of a length (B) of a slab 12 that has been pressed and that (C) of a preceding slab 13 that has not been processed for rough rolling final pass is compared to a distance (A) between a breadthwise pressing apparatus 14 and a roughing mill 16. When the (B+C) exceeds the distance (A) ((B+C)>A), the rough rolling of the early slab 13 is completed, and then the breadthwise pressing of a slab 11 is started. When the (B+C) is not more than (A) ((B+C)≤A), the breadthwise pressing of the slab 11 is started regardless of the completion of rough rolling of the preceding slab 13.

Description

本発明は、粗圧延機の上流側に幅プレス装置が設置されている熱間圧延ラインにおいて、幅プレス装置へスラブを進入させる適切なタイミングを決定することによって、高能率に熱延鋼板を製造することを可能にする高能率熱延鋼板の製造方法に関するものである。   The present invention manufactures a hot-rolled steel sheet with high efficiency by determining an appropriate timing for the slab to enter the width press device in a hot rolling line in which a width press device is installed upstream of the rough rolling mill. The present invention relates to a method for producing a high-efficiency hot-rolled steel sheet that can be performed.

一般的に、熱延鋼板を製造する熱間圧延ラインにおいては、粗圧延機の上流側に幅プレス装置が設置されている（例えば、特許文献１参照）。   In general, in a hot rolling line for producing a hot-rolled steel sheet, a width press device is installed on the upstream side of a roughing mill (see, for example, Patent Document 1).

このような、粗圧延機の上流側に幅プレス装置が設置されている熱間圧延ラインにおいては、幅プレス装置にスラブを進入させる時に、幅プレス装置の後面エリア（下流側エリア）にスペースを確保して、当該スラブが幅プレス終了後に後面エリアで前スラブ（粗バー）と衝突・干渉することを回避する必要がある。   In such a hot rolling line in which a width press device is installed on the upstream side of the roughing mill, when the slab is entered into the width press device, a space is provided in the rear surface area (downstream area) of the width press device. It is necessary to ensure that the slab collides with and interferes with the front slab (coarse bar) in the rear area after the width press.

通常、新規に熱間圧延ラインを設置する場合には、上記のような当該スラブと前スラブ（粗バー）との干渉回避を考慮して、幅プレス装置と粗圧延機の間に十分な距離を確保したライン設計を行う。したがって、このような熱間圧延ラインでは、自ずと幅プレス装置の後面エリアに当該スラブと前スラブ（粗バー）との干渉回避スペースが確保されるので、幅プレス装置にスラブを進入させるタイミングに対しての制約はほとんどない。そのため、幅プレス装置の入側でスラブを滞留させることがなく、圧延能率（生産能率）を阻害することはない。   Normally, when a new hot rolling line is installed, a sufficient distance between the width press device and the roughing mill is taken into consideration to avoid interference between the slab and the previous slab (rough bar) as described above. The line design is ensured. Therefore, in such a hot rolling line, a space for avoiding interference between the slab and the front slab (coarse bar) is naturally secured in the rear surface area of the width press device. There are almost no restrictions. Therefore, the slab is not retained on the entry side of the width press apparatus, and the rolling efficiency (production efficiency) is not hindered.

これに対して、既設の熱間圧延ラインに後から幅プレス装置を導入した場合などは、幅プレス装置と粗圧延機との距離が近いことが多く、当該スラブと前スラブ（粗バー）との干渉回避スペースの確保については、設備上の制約条件が厳しい。且つその粗圧延機がリバース式の場合には、前スラブ（粗バー）が逆転パスで幅プレス装置の後面に搬送されてくるという制約条件も加わる。   On the other hand, when a width press apparatus is introduced later into an existing hot rolling line, the distance between the width press apparatus and the rough rolling mill is often short, and the slab and the front slab (rough bar) In order to secure the interference avoidance space, there are severe restrictions on facilities. In addition, when the rough rolling mill is of a reverse type, there is also a constraint that the front slab (rough bar) is conveyed to the rear surface of the width press device through a reverse pass.

そこで、そのような熱間圧延ラインにおいては、従来は、当該スラブと前スラブ（粗バー）との干渉を回避するために、前スラブ（粗バー）の粗圧延が終わって、幅プレス装置と粗圧延機との間に前スラブ（粗バー）が無いことを確認した上で、幅プレス装置に当該スラブを進入させるようにしている。そうなると、ほとんど場合、幅プレス装置の入側でスラブを待機・滞留させることとなり、圧延能率（生産能率）の低下を招くという問題が生じる。また、幅プレス装置と粗圧延機の間に適切な距離を確保しようとすると、他の多くの設備も再配置することになり、多額の投資金額が必要となってしまう。   Therefore, in such a hot rolling line, conventionally, in order to avoid interference between the slab and the front slab (rough bar), rough rolling of the front slab (rough bar) is finished, After confirming that there is no front slab (rough bar) with the roughing mill, the slab is allowed to enter the width press device. In this case, in most cases, the slab is kept waiting and staying on the entry side of the width press apparatus, which causes a problem of reducing the rolling efficiency (production efficiency). Moreover, if it is going to secure an appropriate distance between a width press apparatus and a rough rolling mill, many other facilities will also be rearranged and a large investment amount will be needed.

特開２０１０−６４１１７号公報JP 2010-64117 A

本発明は、上記のような事情に鑑みてなされたものであり、粗圧延機の上流側に幅プレス装置が設置されている熱間圧延ライン（特に、後から幅プレス装置を導入した熱間圧延ライン）において、大幅な設備投資を招くことなく、生産能率を向上させることができる高能率熱延鋼板の製造方法を提供することを目的とするものである。   The present invention has been made in view of the circumstances as described above, and is a hot rolling line in which a width press apparatus is installed on the upstream side of a roughing mill (particularly, a hot roll in which a width press apparatus is introduced later). An object of the present invention is to provide a method for producing a high-efficiency hot-rolled steel sheet that can improve production efficiency without incurring significant capital investment in the rolling line.

本発明は、上記課題を解決するために、以下の特徴を有している。   The present invention has the following features in order to solve the above problems.

［１］粗圧延機の上流側に幅プレス装置が設置されている熱間圧延ラインにおいて、幅プレス装置と粗圧延機の距離（Ａ）に対して、当該スラブの幅プレス後の長さ（Ｂ）と、前スラブの粗圧延最終パス前の長さ（Ｃ）の合計（Ｂ＋Ｃ）とを比較し、（Ｂ＋Ｃ）が（Ａ）を超える時は、前スラブの粗圧延が終了してから、当該スラブの幅プレスを開始し、（Ｂ＋Ｃ）が（Ａ）以下である時は、前スラブの粗圧延が終了しているか否かにかかわらず、当該スラブの幅プレスを開始することを特徴とする高能率熱延鋼板の製造方法。   [1] In a hot rolling line in which a width press apparatus is installed on the upstream side of the rough rolling mill, the length of the slab after the width press with respect to the distance (A) between the width press apparatus and the rough rolling mill ( B) and the sum (B + C) of the length (C) before the final rolling of the previous slab are compared. When (B + C) exceeds (A), the rough rolling of the previous slab is completed. The width press of the slab is started, and when (B + C) is equal to or less than (A), the width press of the slab is started regardless of whether or not the rough rolling of the previous slab has been completed. A method for producing a high-efficiency hot-rolled steel sheet.

本発明によると、粗圧延機の上流側に幅プレス装置が設置されている熱間圧延ライン（特に、後から幅プレス装置を導入した熱間圧延ライン）において、大幅な設備投資を招くことなく、生産能率を向上させることができる。   According to the present invention, in a hot rolling line in which a width press device is installed on the upstream side of a rough rolling mill (particularly a hot rolling line in which a width press device is introduced later), there is no significant capital investment. , Production efficiency can be improved.

本発明の一実施形態における熱間圧延ラインを示す図である。It is a figure which shows the hot rolling line in one Embodiment of this invention. 本発明の実施例１における本発明例と従来例を比較した図である。It is the figure which compared the example of this invention and the prior art example in Example 1 of this invention.

本発明の一実施形態を図面に基づいて説明する。   An embodiment of the present invention will be described with reference to the drawings.

図１は、本発明の一実施形態における熱間圧延ライン（熱延鋼板製造ライン）の構成を示す平面図である。図１に示すように、この実施形態における熱間圧延ラインでは、粗圧延機１６の上流側に幅プレス装置１４が設置されおり、幅プレス装置１４と粗圧延機１６の間に幅プレス装置〜粗圧延機間テーブル１５が設けられている。そして、スラブ１１は、幅プレス装置１４によって幅プレスされて幅を変更された後、テーブル１５上を搬送され、粗圧延機１６によって（通常）複数パスの粗圧延を施されて、次工程へと進んでいく。   FIG. 1 is a plan view showing the configuration of a hot rolling line (hot rolled steel sheet production line) in one embodiment of the present invention. As shown in FIG. 1, in the hot rolling line in this embodiment, a width press device 14 is installed on the upstream side of the rough rolling mill 16, and the width press device 14 is arranged between the width press device 14 and the rough rolling mill 16. A rough rolling mill table 15 is provided. Then, the slab 11 is width-pressed by the width press device 14 and changed in width, and then conveyed on the table 15 and (normally) subjected to rough rolling of a plurality of passes by the roughing mill 16 to the next step. And proceed.

その際に、この実施形態においては、幅プレス装置１４と粗圧延機１６間の距離（Ａ）、幅プレス後の当該スラブ１２の長さ（Ｂ）、粗圧延最終パス前の前スラブ１３の長さ（Ｃ）を考慮することにより、幅プレス装置１４入側での当該スラブ１１の待機・滞留を大幅に減らすことができるようにしている。   At that time, in this embodiment, the distance (A) between the width press device 14 and the rough rolling machine 16, the length (B) of the slab 12 after the width press, and the front slab 13 before the final rough rolling pass. By taking the length (C) into consideration, standby / stagnation of the slab 11 on the entry side of the width press device 14 can be greatly reduced.

すなわち、具体的に説明すると、幅プレス装置１４と粗圧延機１６の距離（Ａ）に対して、幅プレス後の当該スラブ１２の長さ（Ｂ）と、粗圧延最終パス前の前スラブ１３の長さ（Ｃ）の合計（Ｂ＋Ｃ）を比較し、（Ｂ＋Ｃ）が（Ａ）を超える時（（Ｂ＋Ｃ）＞Ａ）は、前スラブ１３の粗圧延が終了してから、当該スラブ１１の幅プレスを開始し、（Ｂ＋Ｃ）が（Ａ）以下である時（（Ｂ＋Ｃ）≦Ａ）は、前スラブ１３の粗圧延が終了しているか否かにかかわらず、当該スラブ１１の幅プレスを開始する。なお、幅プレス後のスラブ１２の長さ（Ｂ）と、粗圧延最終パス前の前スラブ１３の長さ（Ｃ）は、計算機による算出値を用いる。   Specifically, with respect to the distance (A) between the width press device 14 and the roughing mill 16, the length (B) of the slab 12 after the width pressing and the front slab 13 before the final rough rolling pass. When the total (B + C) of the length (C) of (B + C) exceeds (A) ((B + C)> A), after the rough rolling of the front slab 13 is completed, When the width press is started and (B + C) is equal to or less than (A) ((B + C) ≦ A), the width press of the slab 11 is performed regardless of whether or not the rough rolling of the front slab 13 is finished. Start. In addition, the value calculated by a computer is used for the length (B) of the slab 12 after the width press and the length (C) of the front slab 13 before the final rough rolling pass.

このようにして、この実施形態においては、幅プレス後の当該スラブ１２と前スラブ（粗バー）１３との干渉を回避しながら、当該スラブ１１を必要最小限の待機時間で幅プレス装置１４へ進入させることができるので、大幅な設備投資を招くことなく、生産能率を向上させることができる。   Thus, in this embodiment, while avoiding interference between the slab 12 after the width press and the front slab (rough bar) 13, the slab 11 is transferred to the width press device 14 with a minimum waiting time. Since it can be made to enter, the production efficiency can be improved without incurring significant capital investment.

ちなみに、従来は、前スラブ（粗バー）１３の粗圧延が終わって、幅プレス装置１４と粗圧延機１６との間に前スラブ（粗バー）１３が無いことを確認した上で、当該スラブ１１を幅プレス装置１４に進入させていたために、ほとんどのスラブ１１を幅プレス装置１４の入側で待機・滞留させることになって圧延能率（生産能率）の低下を招いたり、幅プレス装置１４と粗圧延機１６の間に適切な距離を確保しようとして、他の多くの設備も再配置することになり、大幅な設備投資が必要になったりした。   Incidentally, conventionally, after the rough rolling of the front slab (rough bar) 13 has been completed, and it has been confirmed that there is no front slab (rough bar) 13 between the width press device 14 and the rough rolling machine 16, the slab 11 has entered the width press device 14, so that most of the slab 11 is kept on standby at the entry side of the width press device 14, leading to a reduction in rolling efficiency (production efficiency) or the width press device 14. In order to secure an appropriate distance between the rolling mill 16 and the rough rolling mill 16, many other facilities were also rearranged, which required significant capital investment.

本発明の実施例１を述べる。   A first embodiment of the present invention will be described.

本発明例として、上記の本発明の一実施形態に基づいて、幅プレス装置１４でのスラブ１１の幅プレスを行った。すなわち、幅プレス装置１４と粗圧延機１６の距離（Ａ）に対して、幅プレス後の当該スラブ１２の長さ（Ｂ）と、粗圧延最終パス前の前スラブ１３の長さ（Ｃ）の合計（Ｂ＋Ｃ）を比較し、（Ｂ＋Ｃ）が（Ａ）を超える時（（Ｂ＋Ｃ）＞Ａ）は、前スラブ１３の粗圧延が終了するまで待機して、前スラブ１３の粗圧延が終了してから、当該スラブ１１の幅プレスを開始し、一方、（Ｂ＋Ｃ）が（Ａ）以下である時（（Ｂ＋Ｃ）≦Ａ）は、前スラブ１３の粗圧延が終了しているか否かにかかわらず、待機せずに当該スラブ１１の幅プレスを開始した。   As an example of the present invention, the width press of the slab 11 by the width press apparatus 14 was performed based on the above-described embodiment of the present invention. That is, with respect to the distance (A) between the width press device 14 and the rough rolling mill 16, the length (B) of the slab 12 after the width press and the length (C) of the front slab 13 before the final rough rolling pass. When (B + C) exceeds (A) ((B + C)> A), the process waits until the rough rolling of the front slab 13 is completed, and the rough rolling of the front slab 13 is completed. Then, the width press of the slab 11 is started. On the other hand, when (B + C) is equal to or less than (A) ((B + C) ≦ A), whether or not the rough rolling of the front slab 13 is finished. Regardless, the width press of the slab 11 was started without waiting.

これに対して、従来例として、常に、前スラブ１３の粗圧延が終了するまで待機して、幅プレス装置１４と粗圧延機１６との間に前スラブ（粗バー）１３が無いことを確認した上で、当該スラブ１１の幅プレスを開始した。   On the other hand, as a conventional example, it always waits until the rough rolling of the front slab 13 is completed, and it is confirmed that there is no front slab (rough bar) 13 between the width press device 14 and the rough rolling mill 16. After that, the width press of the slab 11 was started.

なお、幅プレス装置１４と粗圧延機１６の距離（Ａ）は３７ｍであった。また、幅プレス後の当該スラブ１２の長さ（Ｂ）の平均値は８ｍで、粗圧延最終パス前の前スラブ１３の長さ（Ｃ）の平均値は２３ｍであった。   The distance (A) between the width press device 14 and the roughing mill 16 was 37 m. Moreover, the average value of the length (B) of the slab 12 after the width press was 8 m, and the average value of the length (C) of the front slab 13 before the final rough rolling pass was 23 m.

その結果を図２に示す。図２に示すように、従来例では、幅プレス装置１４前で待機したスラブ１１の本数比率が１００％であったのに対して、本発明例では、幅プレス装置１４前で待機したスラブ１１の本数比率が１７．５％、幅プレス装置１４前で待機しなかったスラブ１１の本数比率が８２．５％になった。その結果、本発明例では従来例に比べて圧延能率が約１％向上した。   The result is shown in FIG. As shown in FIG. 2, in the conventional example, the ratio of the number of slabs 11 waiting in front of the width press device 14 is 100%, whereas in the present invention example, the slab 11 waiting in front of the width press device 14 is used. The ratio of the number of slabs 11 that did not stand by in front of the width press apparatus 14 was 82.5%. As a result, in the example of the present invention, the rolling efficiency was improved by about 1% compared to the conventional example.

１１ スラブ（当該スラブ）
１２ 幅プレス後の当該スラブ
１３ 粗圧延最終パス前の前スラブ（粗バー）
１４ 幅プレス装置
１５ 幅プレス〜粗圧延機間テーブル
１６ 粗圧延機
Ａ 幅プレス装置〜粗圧延機間距離
Ｂ 幅プレス後の当該スラブの長さ
Ｃ 粗圧延最終パス前の前スラブの長さ 11 Slab (Slab concerned)
12 Slab after width press 13 Slab before rough rolling final pass (rough bar)
14 Width press device 15 Table between width press and rough rolling mill 16 Rough rolling mill A Distance between width press device and rough rolling mill B Length of slab after width press C Length of front slab before final rough rolling pass

Claims (1)

粗圧延機の上流側に幅プレス装置が設置されている熱間圧延ラインにおいて、幅プレス装置と粗圧延機の距離（Ａ）に対して、当該スラブの幅プレス後の長さ（Ｂ）と、前スラブの粗圧延最終パス前の長さ（Ｃ）の合計（Ｂ＋Ｃ）とを比較し、（Ｂ＋Ｃ）が（Ａ）を超える時は、前スラブの粗圧延が終了してから、当該スラブの幅プレスを開始し、（Ｂ＋Ｃ）が（Ａ）以下である時は、前スラブの粗圧延が終了しているか否かにかかわらず、当該スラブの幅プレスを開始することを特徴とする高能率熱延鋼板の製造方法。   In a hot rolling line in which a width press apparatus is installed on the upstream side of the rough rolling mill, the length (B) of the slab after the width press with respect to the distance (A) between the width press apparatus and the rough rolling mill When the total length (B + C) of the previous slab before the rough rolling final pass (B + C) is compared and (B + C) exceeds (A), after the rough rolling of the previous slab is finished, the slab The width press of the slab is started regardless of whether or not the rough rolling of the previous slab is finished when (B + C) is equal to or less than (A). A method for producing an efficient hot-rolled steel sheet.
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