JP4682894B2 - U-shaped steel sheet pile cooling equipment and cooling method - Google Patents

U-shaped steel sheet pile cooling equipment and cooling method Download PDF

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JP4682894B2
JP4682894B2 JP2006084716A JP2006084716A JP4682894B2 JP 4682894 B2 JP4682894 B2 JP 4682894B2 JP 2006084716 A JP2006084716 A JP 2006084716A JP 2006084716 A JP2006084716 A JP 2006084716A JP 4682894 B2 JP4682894 B2 JP 4682894B2
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steel sheet
shaped steel
sheet pile
cooling
web
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JP2007253231A (en
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啓之 福田
直樹 中田
信二 稲村
洋由 大平
晃夫 藤林
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JFE Steel Corp
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Description

本発明は、熱間仕上圧延後にＵ形鋼矢板を冷却するためのＵ形鋼矢板の冷却設備および冷却方法に関するものである。   The present invention relates to a U-shaped steel sheet pile cooling facility and a cooling method for cooling a U-shaped steel sheet pile after hot finish rolling.

図６は、Ｕ形鋼矢板の一般的な形状を示す断面図である。図６に示すように、Ｕ形鋼矢板１は、ウェブ部２、フランジ部３及び爪部４によって構成されている。このＵ形鋼矢板１は、一般に素材を加熱し、粗圧延機、一台以上の中間圧延機、仕上圧延機によって圧延され、例えば分割機（鋸断機ともいう）によって所定の製品長に分割されて、冷却床にてほぼ常温にまで冷却される。一般に、ウェブ部２の肉厚がフランジ部３の肉厚より厚いため、圧延終了直後は、ウェブ部２の方がフランジ部３より温度が高く、ときにはその温度差が１００℃以上となる。   FIG. 6 is a cross-sectional view showing a general shape of a U-shaped steel sheet pile. As shown in FIG. 6, the U-shaped steel sheet pile 1 includes a web portion 2, a flange portion 3, and a claw portion 4. The U-shaped steel sheet pile 1 is generally heated by a raw material and rolled by a roughing mill, one or more intermediate rolling mills, and a finishing mill, and divided into predetermined product lengths by, for example, a dividing machine (also called a sawing machine). Then, it is cooled to almost normal temperature in the cooling bed. Generally, since the thickness of the web portion 2 is thicker than the thickness of the flange portion 3, the temperature of the web portion 2 is higher than that of the flange portion 3 immediately after rolling, and sometimes the temperature difference is 100 ° C. or more.

図７は、仕上圧延後のウェブ部２とフランジ部３の温度履歴を示す線図である。ウェブ部２及びフランジ部３はともに変態点以上の温度で仕上圧延を終了するのが一般的であるが、仕上圧延後の図７の（イ）においては、肉厚の薄いフランジ部３が先に変態し、その変態膨張によって、図８に示すように、ウェブ部２を内側にし、フランジ部３の爪部４を外側とする上反りが発生する。
その後、図７の（ロ）においては、フランジ部３は変態が終了してますます温度が低下するのに対し、肉厚の厚いウェブ部２は、変態が開始され、その変態発熱によって温度低下が鈍化し、ときには温度上昇に転ずることもある。フランジ部３はウェブ部２よりも温度降下が大きく熱収縮も大きいため、図９に示すように、ウェブ部２を外側にしフランジ部３の爪部４を内側とする下反りが発生する。
図７の（ハ）では、ウェブ部２の変態が終了し、Ｕ形鋼矢板１の断面内での熱拡散や周囲への放熱が進んで、ウェブ部２とフランジ部３の温度差がある程度小さくなると下反りは低減し、最終的には上反りへと変化する。 FIG. 7 is a diagram showing the temperature history of the web part 2 and the flange part 3 after finish rolling. Both the web part 2 and the flange part 3 generally finish-finish at a temperature equal to or higher than the transformation point. In FIG. As shown in FIG. 8, due to the transformation expansion, warping occurs with the web portion 2 on the inside and the claw portion 4 of the flange portion 3 on the outside.
Thereafter, in (b) of FIG. 7, the temperature of the flange portion 3 has been transformed and the temperature has decreased. On the other hand, the thick web portion 2 has started transformation, and the temperature is lowered by the transformation heat generation. May slow down and sometimes start to rise in temperature. The flange portion 3 has a lower temperature drop and a larger thermal shrinkage than the web portion 2, and therefore, as shown in FIG. 9, a downward warp occurs with the web portion 2 on the outside and the claw portion 4 of the flange portion 3 on the inside.
In FIG. 7C, the transformation of the web part 2 is completed, the heat diffusion in the cross section of the U-shaped steel sheet pile 1 and the heat dissipation to the surroundings progress, and the temperature difference between the web part 2 and the flange part 3 is to some extent. When it becomes smaller, the downward warpage is reduced, and finally the upper warpage is changed.

このような反りが発生すると、搬送の際に反った部分がエプロン１１やテーブルロール１０にぶつかって変形し、この部分が製品とならず、歩留まりを低下させるばかりか、設備を破損させるなどの問題も発生する。また、搬送能力が低下し、生産性を著しく低下させる。特に下反りが発生した場合は、図９に示すように、Ｕ形鋼矢板１の先端と尾端が搬送テーブルのエプロン１１に乗り上げ、テーブルロール１０と接触しなくなるため、搬送が不能となる。その結果、前述のように、ウェブ部２とフランジ部３の温度差が小さくなって下反りが小さくなるまで、その場で放冷し、待機しなければならない。   When such warping occurs, the warped part is deformed by colliding with the apron 11 or the table roll 10, and this part does not become a product, not only reducing the yield but also damaging the equipment. Also occurs. In addition, the conveyance capacity is lowered, and the productivity is remarkably lowered. In particular, when downward warping occurs, as shown in FIG. 9, the tip and tail ends of the U-shaped steel sheet pile 1 ride on the apron 11 of the transport table and do not come into contact with the table roll 10, so that transport becomes impossible. As a result, as described above, until the temperature difference between the web portion 2 and the flange portion 3 is reduced and the downward warping is reduced, the product must be left standing to cool and be on standby.

この下反りを解消あるいは低減させる手法として、従来、以下の技術が提案されている。
最終仕上圧延前にウェブ部２の温度をフェライト変態温度Ａｒ3 以下に設定し、かつウェブ部２とフランジ部３の温度差を５０℃以内に設定して、図６に示す逆Ｕ字姿勢で仕上圧延を行い、その後、Ｕ形鋼矢板１を反転させてＵ字姿勢で冷却を行う方法がある（例えば、特許文献１参照）。 Conventionally, the following techniques have been proposed as a method for eliminating or reducing the downward warping.
Before the final finish rolling, the temperature of the web part 2 is set to the ferrite transformation temperature Ar 3 or lower, and the temperature difference between the web part 2 and the flange part 3 is set to 50 ° C. or less, and the inverted U-shaped posture shown in FIG. There is a method of performing finish rolling and then cooling the U-shaped steel sheet pile 1 in a U-shaped posture by reversing the U-shaped steel sheet pile 1 (see, for example, Patent Document 1).

また、仕上圧延終了後、直ちにＵ形鋼矢板１を反転してＵ字姿勢の状態で先端部分と後端部分を拘束し、ウェブ部２とフランジ部３の温度差を８０℃以下になるまで強制冷却を行う方法もある（例えば、特許文献２参照）。   Moreover, immediately after finishing rolling, the U-shaped steel sheet pile 1 is reversed and the front end portion and the rear end portion are restrained in a U-shaped posture until the temperature difference between the web portion 2 and the flange portion 3 becomes 80 ° C. or less. There is also a method of performing forced cooling (see, for example, Patent Document 2).

特開昭５８−２１５２０３号公報（第１８頁、第５図−第６図）JP 58-215203 A (page 18, FIGS. 5-6) 特開昭６３−２２０９１７号公報（第９８頁−第９９頁、第１図）JP-A-63-220917 (pages 98-99, FIG. 1)

しかしながら、従来の方法（特許文献１）では、下反りを防止するために、Ｕ形鋼矢板をＵ字姿勢にするための反転装置が新たに必要となり、膨大な設備コストがかかるという問題があった。また、Ｕ字姿勢で搬送すると、テーブルロールと接触するため、ウエブ表面に疵が発生する恐れがあった。   However, in the conventional method (Patent Document 1), in order to prevent downward warping, a reversing device for making the U-shaped steel sheet pile into a U-shape is newly required, and there is a problem that enormous equipment costs are required. It was. Further, when the sheet is conveyed in a U-shaped posture, it comes into contact with the table roll, so that wrinkles may occur on the web surface.

また、仕上圧延終了後拘束し、強制冷却を行う従来の方法（特許文献２）では、Ｕ形鋼矢板の製造ライン内に拘束装置が設置されることになり、設備コストがかかるという問題があった。また、反転や拘束をするためには時間がかかり、生産性を著しく阻害するという問題があった。   Further, in the conventional method (Patent Document 2) in which restraint is performed after finish rolling and forced cooling is performed, a restraint device is installed in the production line of the U-shaped steel sheet pile, and there is a problem that equipment costs are increased. It was. In addition, there is a problem that it takes time to invert and restrain, and the productivity is remarkably hindered.

本発明は上記の課題を解決するためになされたもので、Ｕ形鋼矢板を逆Ｕ字姿勢で圧延し、冷却を行うことによって、反りを防止することができるＵ形鋼矢板の冷却設備および冷却方法を提供することを目的とする。   The present invention has been made in order to solve the above-described problem, and a U-shaped steel sheet pile cooling facility capable of preventing warpage by rolling a U-shaped steel sheet pile in an inverted U-shaped posture and performing cooling. An object is to provide a cooling method.

本発明にかかるＵ形鋼矢板の冷却設備は、Ｕ形鋼矢板の仕上圧延機からその搬送方向の下流側に位置するエアーノズルであって、流速１０ｍ／ｓ以上の空気をＵ形鋼矢板のウェブの上面もしくは下面または両面に供給するエアーノズルを、搬送方向に、Ｕ形鋼矢板のウェブ幅の２倍以内の間隔で連続的に配するものである。   The cooling equipment for the U-shaped steel sheet pile according to the present invention is an air nozzle located on the downstream side in the conveying direction from the finishing mill of the U-shaped steel sheet pile, and air having a flow rate of 10 m / s or more is supplied to the U-shaped steel sheet pile. The air nozzles to be supplied to the upper surface, the lower surface or both surfaces of the web are continuously arranged in the conveying direction at intervals within twice the web width of the U-shaped steel sheet pile.

また、Ｕ形鋼矢板の冷却設備は、ウェブ上面に空気を供給するエアーノズルを、搬送テーブル上から側方に退避させておき、Ｕ形鋼矢板の先端が進入した後にＵ形鋼矢板の上方にエアーノズルを移動させて、送風冷却を開始するものである。   Also, the cooling equipment for the U-shaped steel sheet pile has the air nozzle that supplies air to the upper surface of the web retracted from the conveyance table to the side, and after the tip of the U-shaped steel sheet pile has entered, The air nozzle is moved to start air cooling.

本発明にかかるＵ形鋼矢板の冷却方法は、Ｕ形鋼矢板の仕上圧延機から搬送方向下流側において、エアーノズルにより流速１０ｍ／ｓ以上の空気を、厚さが１２ｍｍ以上であるＵ形鋼矢板のウェブの上面もしくは下面または両面に供給することにより、自然放冷を超える冷却速度から焼入速度未満でウェブを冷却するものである。   The cooling method of the U-shaped steel sheet pile according to the present invention is a U-shaped steel having a thickness of 12 mm or more by air at a flow rate of 10 m / s or more by an air nozzle on the downstream side in the conveying direction from the finishing mill of the U-shaped steel sheet pile. By feeding the sheet pile on the upper surface, lower surface or both surfaces of the web, the web is cooled from a cooling rate exceeding natural cooling to a quenching rate.

また、Ｕ形鋼矢板の冷却方法は、仕上圧延後の分割作業中または分割待機中に、Ｕ形鋼矢板のウェブを冷却するものである。   Moreover, the cooling method of a U-shaped steel sheet pile cools the web of a U-shaped steel sheet pile during the division | segmentation operation | work after finishing rolling, or the division | segmentation standby.

また、Ｕ形鋼矢板の冷却方法は、ウェブの上面に空気を供給するエアーノズルを、搬送テーブル上から側方に退避させておき、Ｕ形鋼矢板の先端が進入した後にＵ形鋼矢板の上方にエアーノズルを移動させて、送風冷却を開始するものである。   Moreover, the cooling method of the U-shaped steel sheet pile is such that the air nozzle that supplies air to the upper surface of the web is retracted from the conveyance table to the side, and after the tip of the U-shaped steel sheet pile enters, The air nozzle is moved upward to start air cooling.

本発明によれば、Ｕ形鋼矢板の仕上圧延後に発生する下反りを防止することができ、生産性の大幅な向上を図ることができる。また、仕上圧延前の冷却装置、仕上圧延後の反転装置や拘束装置が不要であり、設備コストを低減することができる。   ADVANTAGE OF THE INVENTION According to this invention, the downward curvature which generate | occur | produces after the finish rolling of a U-shaped steel sheet pile can be prevented, and productivity can be improved significantly. Moreover, the cooling device before finish rolling, the reversing device after finishing rolling, and the restraint device are unnecessary, and the equipment cost can be reduced.

図１及び図２は、本発明の一実施の形態に係るＵ形鋼矢板の冷却設備の説明図及びその要部の斜視図である。図に示すように、Ｕ形鋼矢板１は、ウェブ部２、フランジ部３及び爪部４から構成されており、Ｕ形鋼矢板１の有効幅はｘ、有効高さはｙである。そして、Ｕ形鋼矢板１は逆Ｕ字姿勢で搬送ライン上に載置されており、テーブルロール１０に接触してエプロン１１上を搬送されるようになっている。エプロン１１には幅方向のほぼ中央に貫通孔１２が設けられており、貫通孔１２内にはウェブ部２の下方より空気を噴射する下部エアーノズル１３が取り付けられ、下部エアー配管１４を介して下方より上方に送風してウェブ部２の下面を冷却するようになっている。   FIG.1 and FIG.2 is explanatory drawing of the cooling equipment of the U-shaped steel sheet pile which concerns on one embodiment of this invention, and the perspective view of the principal part. As shown in the figure, the U-shaped steel sheet pile 1 is composed of a web portion 2, a flange portion 3, and a claw portion 4, and the effective width of the U-shaped steel sheet pile 1 is x and the effective height is y. The U-shaped steel sheet pile 1 is placed on the conveyance line in an inverted U-shaped posture, and is brought into contact with the table roll 10 and conveyed on the apron 11. The apron 11 is provided with a through hole 12 at the substantially center in the width direction, and a lower air nozzle 13 for injecting air from below the web portion 2 is installed in the through hole 12, and the lower air pipe 14 is connected to the apron 11. Air is blown upward from below to cool the lower surface of the web portion 2.

また、ウエブ部２の上方には下部エアーノズル１３と対向して、空気を噴射する上部エアーノズル２０が取り付けられ、上部エアー配管２１を介して上方より下方に送風してウェブ部２の上面を冷却するようになっている。なお、この上部エアーノズル２０は、通常は搬送ライン上方からずれて、図３に示す位置（側方）に退避している。Ｕ形鋼矢板１の生産ラインでは、Ｈ形鋼など他の種類の形鋼を生産する場合があるうえ、Ｕ形鋼矢板１の先端が上に反って進入してくる場合には、退避していると、上部エアーノズル２０などが破損しないですむ。なお、搬送ライン上には分割機３０（図５参照）が設けられている。   Further, an upper air nozzle 20 for injecting air is attached to the upper part of the web part 2 so as to face the lower air nozzle 13, and the upper part of the web part 2 is blown downward from above through the upper air pipe 21. It is designed to cool. The upper air nozzle 20 is usually displaced from the upper part of the transport line and retracted to the position (side) shown in FIG. In the production line of the U-shaped steel sheet pile 1, other types of shape steel such as H-shaped steel may be produced, and when the tip of the U-shaped steel sheet pile 1 is warped upward, it is retracted. If so, the upper air nozzle 20 and the like are not damaged. A divider 30 (see FIG. 5) is provided on the transport line.

Ｕ形鋼矢板１の冷却は以下のようにして行われる。図１、図２及び図５に示すように、Ｕ形鋼矢板１を逆Ｕ字姿勢にして、仕上圧延機４０を出て搬送ライン上を搬送されるＵ形鋼矢板１のウェブ部２の上面と下面を、上下のエアーノズル２０，１３からの空気を噴射して送風冷却する。このとき、送風冷却する部分は、長手方向に分割する前のＵ形鋼矢板１の長さの５０％以上の長さとすればよい。５０％より長ければ、送風中は下反りが発生しにくくなり、図４に示すように、生産能率が急激に上昇する。逆に、５０％より短いと、Ｕ形鋼矢板１の部分的な下反りを許容することとなり、生産能率の向上効果はほとんど期待できなくなる。ただし、この５０％という基準は、設備で許容できる下反り量によって変化する場合がある。   The U-shaped steel sheet pile 1 is cooled as follows. As shown in FIGS. 1, 2, and 5, the U-shaped steel sheet pile 1 is placed in an inverted U-shaped posture, and the web portion 2 of the U-shaped steel sheet pile 1 that is conveyed on the conveying line after leaving the finishing mill 40. The upper and lower surfaces are cooled by blowing air from the upper and lower air nozzles 20 and 13. At this time, the part to be blown and cooled may be 50% or more of the length of the U-shaped steel sheet pile 1 before being divided in the longitudinal direction. If it is longer than 50%, it is difficult for warping to occur during blowing, and the production efficiency increases rapidly as shown in FIG. On the other hand, if it is shorter than 50%, partial downward warping of the U-shaped steel sheet pile 1 is allowed, and an improvement in production efficiency can hardly be expected. However, the reference of 50% may change depending on the amount of warp allowable in the equipment.

上下のエアーノズル２０，１３が、搬送方向にＵ形鋼矢板１のウエブ幅の２倍以内の間隔で設置されれば、空気がウェブ部２に当たる面積率を十分に確保することができる。これは、空気噴射では水などの液体噴射の場合と違って、上下のエアーノズル２０，１３から広角に噴射することができず、広くても噴射角が５０°程度であり、また噴射範囲２２が円形になるという特徴を持つためである。搬送方向が長軸となる楕円状の噴射ができないので、搬送方向にＵ形鋼矢板１のウエブ幅の２倍以上の間隔で上下のエアーノズル２０，１３を設置することは好ましくない。   If the upper and lower air nozzles 20 and 13 are installed in the conveying direction at an interval within twice the web width of the U-shaped steel sheet pile 1, it is possible to sufficiently ensure the area ratio at which the air hits the web portion 2. This is different from the case of liquid injection of water or the like in the case of air injection, and it is impossible to inject from the upper and lower air nozzles 20 and 13 at a wide angle. This is because of the characteristic that becomes circular. Since the elliptical injection with the transport direction as the long axis cannot be performed, it is not preferable to install the upper and lower air nozzles 20 and 13 at intervals of twice or more the web width of the U-shaped steel sheet pile 1 in the transport direction.

上下のエアーノズル２０，１３から噴出する空気の流速を１０ｍ／ｓ以上とすれば、放冷の場合と比べて冷却速度が１．３〜３倍程度になるので、その分、搬送に要する時間が短くなって、生産性が向上する。流速が１０ｍ／ｓ以下であると、噴射圧力が低いため、冷却能力が著しく低下するうえ、上下のエアーノズル２０，１３間の噴射量のばらつきも大きくなるので、好ましくない。   If the flow velocity of the air ejected from the upper and lower air nozzles 20 and 13 is 10 m / s or more, the cooling rate will be about 1.3 to 3 times that of the case of cooling, so that the time required for conveyance is accordingly increased. Becomes shorter and productivity is improved. If the flow velocity is 10 m / s or less, the injection pressure is low, so that the cooling capacity is remarkably lowered and the variation in the injection amount between the upper and lower air nozzles 20 and 13 is increased.

本発明によれば、ウェブ部２の冷却速度を自然放冷を超え、かつ、焼入速度未満で送風冷却するので、従来の放冷を行っていた場合と冷却履歴がほとんど変わらず、良好な品質が得られる。焼入速度は、鋼の成分によって異なるため、フォーマスタ試験などによってあらかじめ冷却速度の上限を把握し、それより小さい冷却速度で冷却すればよい。焼入速度以上であれば、伸びなどの機械的性質が満足されなくなることがあるので、好ましくない。なお、上記の説明では、上下のエアーノズル２０，１３から空気を噴射してＵ形鋼矢板１のウエブ部２を冷却する場合を示したが、状況によりいずれか一方のエアノズル（２０又は１３）からのみ空気を噴射してウエブ部２を冷却してもよい。   According to the present invention, since the cooling rate of the web part 2 exceeds the natural cooling and is blown and cooled below the quenching speed, the cooling history is almost the same as when the conventional cooling is performed, and is good. Quality is obtained. Since the quenching speed varies depending on the steel components, the upper limit of the cooling rate may be grasped in advance by a four master test or the like, and cooling may be performed at a lower cooling rate. If it is higher than the quenching speed, mechanical properties such as elongation may not be satisfied. In the above description, the case where the web portion 2 of the U-shaped steel sheet pile 1 is cooled by injecting air from the upper and lower air nozzles 20 and 13 has been shown, but either one of the air nozzles (20 or 13) depends on the situation. The web portion 2 may be cooled by jetting air only from the inside.

本発明の技術を、ウェブ部２の厚みが１８ｍｍ、ウェブ部２の幅が３６０ｍｍ、フランジ部３の厚みが１１ｍｍ、有効幅ｘが６００ｍｍ、有効高さｙが２１０ｍｍのＵ形鋼矢板１を製造する場合に適用した実施例を、従来の技術と比較して説明する。なお、フォーマスタ試験で調査したこの鋼の焼入速度は４℃／ｓであった。すべての条件で、図５に示すように、圧延ラインの仕上圧延機４０と分割機３０の間で、かつ、Ｕ形鋼矢板１の上下に、Ｕ形鋼矢板１の左右対称軸上の搬送方向に沿って、一列に４００ｍｍピッチで、上下に各９０ずつエアーノズル２０，１３を設置した。５０°の噴射角を持つエアーノズル２０，１３からは、空気を、流量０．５７Ｎｍ3 ／ｍｉｎで円錐状に噴射した。ウェブ部２の上部に噴射された空気は、すぐに周囲へ拡散したので、フランジ部３を冷却させることがなかった。また、ウェブ部２の下部に噴射された空気は、Ｕ形鋼矢板１の先尾端から、エプロン１１との間を開口部として流出するほか、フランジ部３の内面に沿って流れ、Ｕ形鋼矢板１の爪部４の下端とエプロン１１の隙間から流出した。 The technology of the present invention is used to manufacture a U-shaped steel sheet pile 1 having a web portion 2 thickness of 18 mm, a web portion 2 width of 360 mm, a flange portion 3 thickness of 11 mm, an effective width x of 600 mm, and an effective height y of 210 mm. An embodiment applied to this case will be described in comparison with the prior art. The quenching rate of this steel investigated in the Formaster test was 4 ° C./s. Under all conditions, as shown in FIG. 5, the U-shaped steel sheet pile 1 is conveyed between the finishing rolling mill 40 and the dividing machine 30 on the rolling line and above and below the U-shaped steel sheet pile 1 on the symmetrical axis. Along each direction, 90 air nozzles 20 and 13 were installed at a top and bottom at a pitch of 400 mm in a row. From the air nozzles 20 and 13 having an injection angle of 50 °, air was injected conically at a flow rate of 0.57 Nm 3 / min. Since the air sprayed on the upper part of the web part 2 immediately diffused to the surroundings, the flange part 3 was not cooled. In addition, the air injected to the lower part of the web part 2 flows out from the front end of the U-shaped steel sheet pile 1 as an opening between the apron 11 and flows along the inner surface of the flange part 3. It flowed out of the gap between the lower end of the claw portion 4 of the steel sheet pile 1 and the apron 11.

表１に、実施例において必要な設備、送風冷却による温度降下、冷却速度および実施結果としての生産能率を、従来の技術と比較して示す。   Table 1 shows the equipment required in the examples, the temperature drop due to air cooling, the cooling rate, and the production efficiency as a result of the implementation in comparison with the conventional technology.

Figure 0004682894
Figure 0004682894

比較例１は、仕上圧延前に冷却を行い、仕上圧延後にＵ字姿勢に反転した後、拘束し、冷却を行う従来技術である。仕上圧延前の冷却で、ウェブ部２の温度をフェライト変態温度Ａｒ3 以下まで下げるために、最も長い時間を要し、生産能率が７０ｔｏｎ／ｈｒであった。 Comparative Example 1 is a conventional technique in which cooling is performed before finish rolling, and the U-shaped posture is reversed after finishing rolling, and then restrained and cooled. It took the longest time to lower the temperature of the web part 2 to the ferrite transformation temperature Ar 3 or lower by cooling before finish rolling, and the production efficiency was 70 ton / hr.

比較例２は、仕上圧延前に冷却を行わず、仕上圧延後にＵ字姿勢に反転した後、拘束し、冷却を行う従来技術である。仕上圧延が終了するのを待って、製品を反転させ、拘束して冷却するなどのハンドリングに、長い時間を要したために、生産能率は８０ｔｏｎ／ｈｒであった。   Comparative Example 2 is a conventional technique in which cooling is not performed before finish rolling, but is constrained and cooled after being reversed to a U-shaped posture after finish rolling. The production efficiency was 80 ton / hr because a long time was required for handling such as inverting, restraining and cooling the product after finishing rolling was finished.

実施例１は、本発明の技術であり、仕上圧延前の冷却は行わず、仕上圧延後、逆Ｕ字姿勢を変えずに分割機３０まで搬送し、停止させて分割作業を行っている間に、分割前の製品長さ６０ｍに対し、６０％の長さすなわち３６ｍの送風冷却設備を設置し、ウェブ部２を、冷却速度２℃／ｓで冷却させたものである。
また、Ｕ形鋼矢板１が分割機３０に進入すると同時に、ウェブ部２の上下部への空気の噴出を開始した。上下のエアーノズル２０，１３から噴出する空気の流速を３０ｍ／ｓとした。冷却速度を２℃／ｓとする弱冷却を行ったため、冷却中に焼きが入ることはなく、従来製造しているＵ形鋼矢板１の材質と同じものが得られた。 Example 1 is a technique of the present invention, in which cooling before finish rolling is not performed, and after finish rolling, the workpiece is transported to the dividing machine 30 without changing the inverted U-shaped posture, and stopped while performing the dividing operation. In addition, a 60% length, that is, 36 m of blast cooling equipment is installed with respect to the product length of 60 m before the division, and the web portion 2 is cooled at a cooling rate of 2 ° C./s.
Moreover, at the same time when the U-shaped steel sheet pile 1 entered the divider 30, the ejection of air to the upper and lower portions of the web portion 2 was started. The flow rate of air ejected from the upper and lower air nozzles 20 and 13 was set to 30 m / s. Since weak cooling was performed at a cooling rate of 2 ° C./s, no quenching occurred during cooling, and the same material as the U-shaped steel sheet pile 1 manufactured in the past was obtained.

従来技術（比較例１，２）と比べると、仕上圧延前の冷却装置、仕上圧延後の反転装置および拘束装置が不要となったので、設備コストを大幅に低減することができた。また、製品長さの中心付近６０％の長さでウェブ部２を冷却したので、仕上圧延後の下反りが一部低減され、下反りによる搬送不能となる時間が短くなった。いずれの従来技術も生産能率が低かったのに対し、仕上圧延前の冷却、反転、拘束の時間がなくなり、仕上圧延後の分割作業中の停止している状態で冷却を行ったために、時間を有効に利用することができたので、生産能率は１０５ｔｏｎ／ｈｒに向上した。   Compared with the prior art (Comparative Examples 1 and 2), the cooling device before finish rolling, the reversing device after finish rolling, and the restraint device are no longer necessary, and thus the equipment cost can be greatly reduced. In addition, since the web portion 2 was cooled at a length of 60% near the center of the product length, a part of the bottom warp after finish rolling was reduced, and the time during which the conveyance became impossible due to the bottom warp was shortened. Although all of the conventional technologies had low production efficiency, the cooling, reversal and restraint time before finish rolling was eliminated, and cooling was performed in the stopped state during the split operation after finish rolling. Since it could be used effectively, the production efficiency was improved to 105 ton / hr.

本発明の一実施の形態に係るＵ形鋼矢板の冷却設備の説明図である。It is explanatory drawing of the cooling equipment of the U-shaped steel sheet pile which concerns on one embodiment of this invention. 図１の要部の斜視図である。It is a perspective view of the principal part of FIG. 図１の上部エアーノズルを搬送ライン上方からずらした状態の縦断面図である。It is a longitudinal cross-sectional view of the state which shifted the upper air nozzle of FIG. 1 from the conveyance line upper direction. 冷却設備の長さと生産能率の関係を示す線図である。It is a diagram which shows the relationship between the length of a cooling facility, and production efficiency. 本発明の実施例の圧延ラインを示す説明図である。It is explanatory drawing which shows the rolling line of the Example of this invention. 逆Ｕ字姿勢のＵ形鋼矢板を示す縦断面図である。It is a longitudinal cross-sectional view which shows the U-shaped steel sheet pile of a reverse U character attitude | position. ウェブ部とフランジ部の仕上圧延後の温度履歴を示す線図である。It is a diagram which shows the temperature history after the finish rolling of a web part and a flange part. Ｕ形鋼矢板の上反りの状態を示す斜視図である。It is a perspective view which shows the state of the upper curvature of a U-shaped steel sheet pile. Ｕ形鋼矢板の下反りの状態を示す斜視図である。It is a perspective view which shows the state of the downward curvature of a U-shaped steel sheet pile.

符号の説明Explanation of symbols

１ Ｕ形鋼矢板、２ ウェブ部、３ フランジ部、４ 爪部、１０ テーブルロール、１１ エプロン、１３ 下部エアーノズル、１４ 下部エアー配管、２０ 上部エアーノズル、２１ 上部エアー配管、２２ エアーの噴射範囲、３０ 分割機、４０ 仕上圧延機、ｘ 有効幅、ｙ 有効高さ。
1 U-shaped steel sheet pile, 2 web part, 3 flange part, 4 claw part, 10 table roll, 11 apron, 13 lower air nozzle, 14 lower air pipe, 20 upper air nozzle, 21 upper air pipe, 22 air injection range 30 splitting machine, 40 finish rolling mill, x effective width, y effective height.

Claims (5)

Ｕ形鋼矢板の仕上圧延機からその搬送方向の下流側に位置するエアーノズルであって、流速１０ｍ／ｓ以上の空気を前記Ｕ形鋼矢板のウェブの上面もしくは下面または両面に供給する前記エアーノズルを、搬送方向に、前記Ｕ形鋼矢板のウェブ幅の２倍以内の間隔で連続的に配したことを特徴とするＵ形鋼矢板の冷却設備。   An air nozzle located on the downstream side in the conveying direction from a finishing mill of a U-shaped steel sheet pile, wherein the air supplies a flow velocity of 10 m / s or more to the upper surface, the lower surface or both surfaces of the web of the U-shaped steel sheet pile. The cooling equipment for U-shaped steel sheet piles, characterized in that nozzles are continuously arranged in the conveying direction at intervals within twice the web width of the U-shaped steel sheet piles. 前記ウェブ上面に空気を供給する前記エアーノズルを、搬送テーブル上から側方に退避させておき、前記Ｕ形鋼矢板の先端が進入した後に前記Ｕ形鋼矢板の上方に前記エアーノズルを移動させて、送風冷却を開始することを特徴とする請求項１記載のＵ形鋼矢板の冷却設備。   The air nozzle that supplies air to the upper surface of the web is retracted sideways from the transfer table, and after the tip of the U-shaped steel sheet pile has entered, the air nozzle is moved above the U-shaped steel sheet pile. The cooling equipment for the U-shaped steel sheet pile according to claim 1, wherein air cooling is started. Ｕ形鋼矢板の仕上圧延機から搬送方向下流側において、エアーノズルにより流速１０ｍ／ｓ以上の空気を、厚さが１２ｍｍ以上であるＵ形鋼矢板のウェブの上面もしくは下面または両面に供給することにより、自然放冷を超える冷却速度から焼入速度未満でウェブを冷却することを特徴とするＵ形鋼矢板の冷却方法。   Supplying air with a flow velocity of 10 m / s or more to the upper surface, lower surface, or both surfaces of a U-shaped steel sheet pile having a thickness of 12 mm or more by an air nozzle on the downstream side in the conveying direction from the finishing mill of the U-shaped steel sheet pile The cooling method of the U-shaped steel sheet pile characterized by cooling the web at a cooling rate exceeding natural cooling and less than the quenching rate. 仕上圧延後の分割作業中または分割待機中に、前記Ｕ形鋼矢板のウェブを冷却することを特徴とする請求項３に記載のＵ形鋼矢板の冷却方法。   The method for cooling a U-shaped steel sheet pile according to claim 3, wherein the web of the U-shaped steel sheet pile is cooled during the division operation after finishing rolling or during the division standby. 前記ウェブの上面に空気を供給する前記エアーノズルを、搬送テーブル上から側方に退避させておき、前記Ｕ形鋼矢板の先端が進入した後に前記Ｕ形鋼矢板の上方に前記エアーノズルを移動させて、送風冷却を開始することを特徴とする請求項３または４記載のＵ形鋼矢板の冷却方法。
The air nozzle for supplying air to the upper surface of the web is retracted to the side from the transfer table, and the air nozzle is moved above the U-shaped steel sheet pile after the tip of the U-shaped steel sheet pile has entered. The cooling method for the U-shaped steel sheet pile according to claim 3, wherein the cooling of the blow is started.
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