JPH06339707A - Method for joining billet in hot rolling - Google Patents
Method for joining billet in hot rollingInfo
- Publication number
- JPH06339707A JPH06339707A JP13047793A JP13047793A JPH06339707A JP H06339707 A JPH06339707 A JP H06339707A JP 13047793 A JP13047793 A JP 13047793A JP 13047793 A JP13047793 A JP 13047793A JP H06339707 A JPH06339707 A JP H06339707A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- joining
- molten
- billet
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明は、先行して搬送される
鋼片と、これに引き続いて搬送される後続の鋼片とを、
熱間圧延設備の入り側にて接合することで、連続的に圧
延ラインに供することを可能にする熱間圧延における鋼
片の接合方法に関し、特に圧延後の製品歩留まりを向上
させることのできる研究開発の成果につき提案しようと
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel strip that is conveyed first and a subsequent steel strip that is subsequently conveyed.
Study on joining method of steel slab in hot rolling that enables continuous application to rolling line by joining at the entrance side of hot rolling equipment, especially research that can improve product yield after rolling It aims to propose the results of development.
【0002】[0002]
【従来の技術】従来、熱間圧延ラインでは、圧延すべき
鋼片を目標温度に加熱したのち、一本ずつ粗圧延工程、
仕上圧延工程に通して所望の厚みを持った熱延板に仕上
げていたが、かような圧延方式では、特に仕上圧延工程
での圧延素材の噛み込み不良によるライン停止等のトラ
ブルが生じやすく、また圧延素材の先端、後端部の形状
不良に起因した歩留まりの低下が大きいため、このよう
な問題の早期解決が望まれていた。2. Description of the Related Art Conventionally, in a hot rolling line, a steel strip to be rolled is heated to a target temperature and then a rough rolling process is performed one by one.
Although it was finished into a hot-rolled sheet having a desired thickness through the finish rolling process, such a rolling method tends to cause troubles such as line stop due to defective biting of the rolled material particularly in the finish rolling process, Further, since the yield is largely reduced due to the defective shape of the leading end and the trailing end of the rolled material, there has been a demand for early resolution of such a problem.
【0003】熱間圧延ラインにおける上記の如きトラブ
ルを解消し、生産性のより一層の改善を図るべく、仕上
圧延設備の入り側で、先行する圧延素材の後端部とそれ
に引き続く後続の素材の先端部とを接合し、数本〜数十
本の圧延素材を連続的に仕上圧延工程に供給する方法が
提案されるようになった。例えば特開昭62-234679 号公
報に開示されているような、先行鋼片後端と後行鋼片先
端とを非接触状態で対向させ、鋼片の厚み方向に貫通す
る交番磁界を印加して加熱しながら該鋼片を押圧する方
法が提案されている(図1参照)。また、特開平4-891
09号公報には、図2に示すように、熱間圧延の入り側に
て、先行して搬送する鋼片1a の先端部とこれに引き続
いて搬送する鋼片1b の後端部とを接触させ、その領域
で鋼片の厚み方向に貫通する交番磁界fを印加して加熱
する処理と、該鋼片を押圧する処理とを組み合わせて接
合する方法が提案されている。In order to eliminate the above-mentioned troubles in the hot rolling line and further improve the productivity, the trailing end of the preceding rolling material and the succeeding succeeding material at the entry side of the finishing rolling facility are A method has been proposed in which the tip portion is joined and several to several tens of rolled materials are continuously supplied to the finish rolling step. For example, as disclosed in JP-A-62-234679, the trailing edge of the preceding billet and the leading edge of the following billet are made to face each other in a non-contact state, and an alternating magnetic field penetrating in the thickness direction of the billet is applied. A method of pressing the steel piece while heating by heating has been proposed (see FIG. 1). In addition, JP-A-4-891
In the 09 publication, as shown in FIG. 2, on the entry side of hot rolling, the leading end portion of the steel piece 1a conveyed first and the rear end portion of the steel piece 1b conveyed subsequently are contacted. There has been proposed a method of joining by joining a process of heating by applying an alternating magnetic field f penetrating in the thickness direction of the steel slab in that region and a process of pressing the steel slab.
【0004】これらの方法は、上記交番磁界により誘導
電流eを誘起させて、この誘導電流eに基づく抵抗加熱
により接合するものである。上掲特開昭62-234679 号公
報に開示の方法によれば、図1のように誘導電流eが、
接合したい先行鋼片の後端面及び後行鋼片の先端面付近
に集中して流れるため、この部分がジュール発熱により
集中的に加熱され、この状態で該鋼片同士を押圧する処
理とを組み合わせることにより、接合を得る。また、前
掲特開平4-89109号公報に開示の方法によれば、先行鋼
片の接合領域として鋼片幅方向両端部とすることによ
り、接合時間短縮と投入電力節減が図れるとしており、
この方法の場合、図2に示すように、誘導電流eは、先
行して搬送する鋼片1a の後端とこれに引き続いて搬送
する鋼片1b の先端との幅方向両端の接触領域を通る周
回径路を流れ、さらに鋼片の押圧処理を組み合わすこと
で鋼片の接合領域を鋼片幅方向両端部から中央部へ拡大
させている。These methods involve inducing an induced current e by the alternating magnetic field and joining by resistance heating based on the induced current e. According to the method disclosed in Japanese Patent Laid-Open No. 62-234679, the induced current e as shown in FIG.
Since it flows intensively near the rear end surface of the preceding steel piece to be joined and the front end surface of the following steel piece, this portion is intensively heated by Joule heat generation, and combined with the processing of pressing the steel pieces in this state. By this, a bond is obtained. Further, according to the method disclosed in Japanese Patent Application Laid-Open No. 4-89109, it is said that the joining time of the preceding steel slab and the both ends of the steel slab in the width direction can be shortened and the power consumption can be reduced.
In the case of this method, as shown in FIG. 2, the induced current e passes through the contact regions at both ends in the width direction between the trailing end of the preceding steel piece 1a and the leading end of the following steel piece 1b. The joining region of the steel pieces is expanded from both ends in the width direction of the steel pieces to the central portion by flowing through the circular path and further combining pressing processing of the steel pieces.
【0005】[0005]
【発明が解決しようとする課題】上掲特開昭62-234679
号公報や特開平4-89109号公報の方法では、いずれの場
合も鋼片相互を押圧時に、接合領域にて鋼片の溶融部分
が押圧によりゼリー状に押し出される。一例としてこの
特開平4-89109号公報に開示の両幅端接合を例にとって
説明するが、押圧によりゼリー状に押し出された溶鋼の
ようすは図3(a),(b) に示すような状態となる。この押
し出された溶鋼及び溶融スケールが、接合完了後に固化
して接合部に残ったまま、後工程で仕上圧延に供する
と、図4に示すように被圧延面上に押し出されて残存し
ている上記溶鋼及び溶融スケール3も圧延されて、鋼片
長手方向に延伸してしまう。[Problems to be Solved by the Invention] Japanese Patent Laid-Open No. 62-234679
In any of the methods disclosed in Japanese Patent Laid-Open No. 4-89109 and Japanese Patent Laid-Open No. 4-89109, when the steel pieces are pressed against each other, the molten portion of the steel pieces is extruded in a jelly shape by pressing in the joining region. As an example, description will be given by taking the case of the both width end joints disclosed in JP-A-4-89109 as an example. The appearance of molten steel extruded in a jelly shape by pressing is as shown in FIGS. 3 (a) and 3 (b). Becomes When the extruded molten steel and the molten scale are solidified after the joining is completed and remain in the joined portion and subjected to finish rolling in a later step, they are extruded and remain on the surface to be rolled as shown in FIG. The molten steel and the molten scale 3 are also rolled and stretched in the longitudinal direction of the billet.
【0006】したがって、この溶鋼及び溶融スケール3
が延伸した領域Lは、厚み方向、幅方向ともに成分の違
った2相が隣接した状態になるから、この部分を圧延完
了後に不良部分として切り落とす必要が生じ、製品歩留
まりの低下を来していた。Therefore, this molten steel and molten scale 3
In the stretched region L, two phases having different components in the thickness direction and the width direction are adjacent to each other, so that this portion needs to be cut off as a defective portion after the completion of rolling, resulting in a decrease in product yield. .
【0007】この発明は、上記の問題を有利に解決する
もので、加熱処理と押圧する処理を組み合わせた鋼片の
接合方法において、被圧延面に押し出された溶鋼及び溶
融スケールによる製品歩留まりの低下を防止する方法を
提案することを目的とする。The present invention advantageously solves the above problems, and in a method for joining steel slabs in which a heating process and a pressing process are combined, a reduction in product yield due to molten steel and molten scale extruded on the surface to be rolled. The purpose is to propose a method of preventing.
【0008】[0008]
【課題を解決するための手段】この発明は、熱間圧延設
備の入り側にて、先行して搬送する鋼片の後端部とこれ
に引き続いて搬送する後続の鋼片の先端部とを対向さ
せ、次いでその領域にて鋼片を加熱する処理と鋼片を押
圧する処理との組み合わせにより鋼片を相互に密着させ
る接合方法において、加熱押圧時に被圧延面へ押し出さ
れた溶鋼及び溶融スケールを、圧延に先立って除去する
ことを特徴とする熱間圧延における鋼片の接合方法であ
る。According to the present invention, at the entrance side of a hot rolling facility, there is provided a rear end portion of a steel piece to be conveyed first and a tip end portion of a subsequent steel piece to be subsequently conveyed. In the joining method in which the steel pieces are brought into close contact with each other by the combination of the treatment of heating the steel pieces in the area and then the treatment of pressing the steel pieces in the area, the molten steel and the molten scale extruded to the surface to be rolled at the time of heating and pressing. Is removed prior to rolling, which is a method for joining steel slabs in hot rolling.
【0009】接合しようとする鋼片を対向させた後の加
熱・押圧の組み合わせ処理としては、 1)接合予定部が接触状態又は非接触状態の如何にかか
わらず、接合予定部の温度が目標温度に達した時点で加
熱を停止し、次いで押圧する方法、 2)同じく、接合予定部が接触状態又は非接触状態の如
何にかかわらず接合予定部の温度が接合可能温度に達し
たならば、加熱は継続したままで、押圧を開始する方
法、 3)最初から鋼片同士を押圧し、接合部の加熱も同時に
行う方法、 4)所定の接合代まで押圧した後、押圧を維持した状態
で加熱を開始する方法 など、いずれの方法でも良い。The combination of heating and pressing after the steel pieces to be joined face each other is as follows: 1) Regardless of whether the joining portion is in contact or not, the temperature of the joining portion is the target temperature. When the temperature of the planned joining portion reaches the joining possible temperature regardless of whether the joining target portion is in the contact state or the non-contact state, the heating is stopped when the joining target portion reaches the joining temperature. To continue pressing, 3) Pressing the steel pieces from the beginning and heating the joints at the same time, 4) Pressing up to the prescribed joining margin and then heating while maintaining the pressure Any method is acceptable, such as the method to start.
【0010】なお加熱手段としては、交番磁界発生コイ
ルを用い鋼片の厚み方向に対してそれを貫くような交番
磁界を印加して加熱する方法の他にも、バーナーによる
加熱やソレノイド式のコイルによる高周波加熱であって
もよい。As a heating means, an alternating magnetic field generating coil may be used to apply an alternating magnetic field penetrating the steel slab in the thickness direction to heat the steel slab, or heating by a burner or a solenoid type coil. It may be high frequency heating.
【0011】[0011]
【作用】この発明は、加熱押圧時に被圧延面へ押し出さ
れた状態の溶鋼及び溶融スケールを圧延に先立って除去
することにより、かかる溶鋼及び溶融スケールが、後工
程の圧延により延伸することを回避することができるか
ら、接合部位は鋼片厚み方向、幅方向にも寸法や成分上
の非定常部分を極小に抑制することができ、製品歩留ま
りの低下が防止できる。The present invention removes the molten steel and molten scale extruded to the surface to be rolled during heating and pressing prior to rolling, thereby preventing the molten steel and molten scale from stretching due to rolling in the subsequent step. As a result, it is possible to minimize unsteady portions in terms of size and composition in the joining portion in the thickness direction and the width direction of the steel slab, and it is possible to prevent a decrease in product yield.
【0012】この固化した溶鋼及び溶融スケールの具体
的な除去手段としては、図5に示すようにピーラー4で
はぎとったり(同図(a) )、グラインダ5で研削したり
(同図(b) )する例がある。As a concrete means for removing the solidified molten steel and the molten scale, as shown in FIG. 5, the peeler 4 is used to strip (see FIG. 5 (a)) or grinder 5 is used to grind (see FIG. 5 (b)). ) There is an example.
【0013】除去手段の別の例を図6に示す。この図の
例は、溶鋼及び溶融スケール3に冷水を供給して急冷
し、脆化させた後に、刃を押し当てて除去するものであ
り、図6(a) には、鋼片の幅方向に刃6aを押し当てる
例を、また図6(b) には、鋼片の長手方向に刃6bを押
し当てる例をそれぞれ示している。このように鋼片の接
合後、溶鋼及び溶融スケール3へ冷却剤噴射ノズル7か
ら多量の水をかけたとしても、接合部には悪影響がな
い。Another example of the removing means is shown in FIG. In the example of this figure, cold water is supplied to the molten steel and the molten scale 3 to rapidly cool them to make them brittle, and then the blades are pressed to remove them. An example in which the blade 6a is pressed against the blade, and FIG. 6B shows an example in which the blade 6b is pressed in the longitudinal direction of the steel slab. Thus, even if a large amount of water is applied to the molten steel and the molten scale 3 from the coolant injection nozzle 7 after joining the steel pieces, there is no adverse effect on the joint.
【0014】上述したような除去手段は、鋼片接合装置
よりも圧延方向下流に設置した後処理機へ一つの機能と
して組み込んでもよい。The removing means as described above may be incorporated as one function into a post-processing machine installed downstream of the steel piece joining device in the rolling direction.
【0015】[0015]
【実施例】図7に示した鋼片端部形状になる先行して搬
送する鋼片1a及びそれに引き続いて搬送する鋼片1b
(いずれも幅1000mm、厚み30mm)を突き合わせ、この接
合しようとする領域に、交番磁界発生用コイルを配置し
て、投入電力2000kW、周波数500 Hzの交番磁界を印加し
て加熱しつつ、鋼片を押圧力2kgf/mm2 で押圧して接合
を完了させた。次いで非圧延面に押し出され、固化した
溶鋼及び溶融スケールをピーラーで除去した後、熱間仕
上圧延に供したところ、接合部のクロップロス割合は、
長さ12 m当たり0.002 %であり、固化した溶鋼及び溶融
スケールの除去を行わない従来法のクロップロス割合0.
03%に対して、格段の軽減がみられた。EXAMPLE A steel piece 1a which is conveyed in advance and has a steel piece end shape shown in FIG. 7 and a steel piece 1b which is subsequently conveyed.
(Both width 1000mm, thickness 30mm) Butt, place the coil for alternating magnetic field generation in the area to be joined, and apply the alternating magnetic field of input power 2000kW, frequency 500Hz to heat the steel strip. Was pressed with a pressing force of 2 kgf / mm 2 to complete the joining. Then extruded to the non-rolled surface, after removing the solidified molten steel and molten scale with a peeler, subjected to hot finish rolling, the crop loss ratio of the joint,
It is 0.002% per 12 m in length, and the crop loss ratio of the conventional method without removing solidified molten steel and molten scale is 0.
A dramatic reduction was seen against 03%.
【0016】なお、以上の説明では、課題を解決するた
めの手段及び実施例の説明として、特開平4-89109号公
報に開示の両幅端部接合方法を想定して記述し、図もそ
れに対応したものとしたが、この発明は、かかる説明に
拘泥されることなく、例えば、幅中央部接合方法や全幅
接合方法に対応する溶鋼、溶融スケール除去の目的にも
かなうものであることは言うまでもない。また、加熱手
段としては、上記交番磁界の印加による方法の他にも、
バーナーによる加熱やソレノイド式のコイルによる高周
波加熱であってもよい。In the above description, the means for solving the problems and the embodiments will be described assuming the double-width end joining method disclosed in Japanese Patent Laid-Open No. 4-89109, and the drawings will also be described. Although it has been made to correspond, it goes without saying that the present invention is not limited to such a description, and for example, it also serves the purpose of removing molten steel and molten scale corresponding to the width center joining method and the full width joining method. Yes. Further, as the heating means, in addition to the method by applying the alternating magnetic field,
It may be heating by a burner or high frequency heating by a solenoid coil.
【0017】[0017]
【発明の効果】この発明は、鋼片の接合後、被圧延面に
押し出され固化した溶鋼及び溶融スケールを除去し、し
かる後に圧延に供するようにしたので、接合部で鋼片厚
み方向、幅方向にも寸法や成分上の非定常部分を極小に
抑制することができるようになり、製品歩留まりの低下
が防止できるようになった。EFFECTS OF THE INVENTION According to the present invention, the molten steel and the molten scale extruded and solidified on the surface to be rolled are removed after the joining of the steel slabs, and the steel is then subjected to rolling. It has become possible to minimize unsteady parts in terms of size and composition in the direction as well, and to prevent a decrease in product yield.
【図1】鋼片の接合方法の説明図である。FIG. 1 is an explanatory view of a method for joining steel pieces.
【図2】鋼片の接合方法の説明図である。FIG. 2 is an explanatory diagram of a method for joining steel pieces.
【図3】接合領域における鋼片の溶融部分の説明図であ
る。FIG. 3 is an explanatory diagram of a molten portion of a steel slab in a joining region.
【図4】従来技術の問題点の説明図である。FIG. 4 is an explanatory diagram of a problem of the conventional technique.
【図5】除去手段の説明図である。FIG. 5 is an explanatory diagram of a removing unit.
【図6】除去手段の他の例の説明図である。FIG. 6 is an explanatory diagram of another example of a removing unit.
【図7】実施例における鋼片形状の説明図である。FIG. 7 is an explanatory view of the shape of a steel slab in the example.
1a 先行して搬送する鋼片 1b 引き続いて搬送する鋼片 2 溶融部分 3 溶鋼及び溶鋼スケール 4 ピーラー 5 グラインダ 6 刃 7 溶鋼・溶融スケール冷却用、冷却剤噴射ノズル 1a Steel piece to be conveyed in advance 1b Steel piece to be conveyed subsequently 2 Molten portion 3 Molten steel and molten steel scale 4 Peeler 5 Grinder 6 Blade 7 Coolant injection nozzle for cooling molten steel / molten scale
フロントページの続き (72)発明者 武智 敏貞 千葉県千葉市中央区川崎町1番地 川崎製 鉄株式会社千葉製鉄所内 (72)発明者 二階堂 英幸 千葉県千葉市中央区川崎町1番地 川崎製 鉄株式会社千葉製鉄所内 (72)発明者 高島 典生 千葉県千葉市中央区川崎町1番地 川崎製 鉄株式会社千葉製鉄所内 (72)発明者 天笠 敏明 千葉県千葉市中央区川崎町1番地 川崎製 鉄株式会社千葉製鉄所内 (72)発明者 三登 良紀 広島県広島市西区観音新町4丁目6番22号 三菱重工業株式会社広島製作所内 (72)発明者 黒田 彰夫 広島県広島市西区観音新町4丁目6番22号 三菱重工業株式会社広島製作所内Front page continuation (72) Toshisada Takechi Inventor Toshisada Takechi 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Inside the Chiba Steel Works, Kawasaki Steel (72) Inventor Hideyuki Nikaido 1 Kawasaki-cho, Chuo-ku, Chiba, Chiba Kawasaki Steel Inside the Chiba Works (72) Inventor Norio Takashima 1 Kawasaki-cho, Chuo-ku, Chiba, Chiba Prefecture Kawasaki Works Inside the Chiba Works (72) Toshiaki Amagasa, 1 Kawasaki-cho, Chuo-ku, Chiba Prefecture Kawasaki Steel Inside the Chiba Steel Works (72) Inventor Yoshinori Mito 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries Ltd. Inside Hiroshima Works (72) Inventor Akio Kuroda 4-6 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture No. 22 Mitsubishi Heavy Industries Hiroshima Works
Claims (1)
送する鋼片の後端部とこれに引き続いて搬送する後続の
鋼片の先端部とを対向させ、次いでその領域にて鋼片を
加熱する処理と鋼片を押圧する処理との組み合わせによ
り鋼片を相互に密着させる接合方法において、 加熱押圧時に被圧延面へ押し出された溶鋼及び溶融スケ
ールを、圧延に先立って除去することを特徴とする熱間
圧延における鋼片の接合方法。1. On the entry side of a hot rolling facility, the rear end of a steel strip that is conveyed first and the rear end of a subsequent steel strip that is subsequently conveyed are made to face each other, and then in that area. In the joining method in which the steel pieces are brought into close contact with each other by the combination of the processing of heating the steel pieces and the processing of pressing the steel pieces, the molten steel and molten scale extruded to the surface to be rolled during the heating and pressing are removed prior to rolling. A method for joining steel slabs in hot rolling, which is characterized by the above.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13047793A JPH06339707A (en) | 1993-06-01 | 1993-06-01 | Method for joining billet in hot rolling |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13047793A JPH06339707A (en) | 1993-06-01 | 1993-06-01 | Method for joining billet in hot rolling |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH06339707A true JPH06339707A (en) | 1994-12-13 |
Family
ID=15035189
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13047793A Withdrawn JPH06339707A (en) | 1993-06-01 | 1993-06-01 | Method for joining billet in hot rolling |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH06339707A (en) |
-
1993
- 1993-06-01 JP JP13047793A patent/JPH06339707A/en not_active Withdrawn
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Legal Events
Date | Code | Title | Description |
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A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000801 |