JPH07148526A - Method for straightening cross-sectional shape of shape steel - Google Patents
Method for straightening cross-sectional shape of shape steelInfo
- Publication number
- JPH07148526A JPH07148526A JP29825793A JP29825793A JPH07148526A JP H07148526 A JPH07148526 A JP H07148526A JP 29825793 A JP29825793 A JP 29825793A JP 29825793 A JP29825793 A JP 29825793A JP H07148526 A JPH07148526 A JP H07148526A
- Authority
- JP
- Japan
- Prior art keywords
- roller
- flange
- angle
- vertical
- rolls
- 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.)
- Withdrawn
Links
Landscapes
- Straightening Metal Sheet-Like Bodies (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、Ｈ形鋼等ウエブ及びフ
ランジを有する形鋼の形状矯正技術に関し、特にフラン
ジのウエブに対する取り付け角度を修正するのに有用な
矯正方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for straightening a web such as an H-section steel and a shaped steel having a flange, and more particularly to a straightening method useful for correcting the mounting angle of the flange to the web.
【０００２】[0002]
【従来の技術】一般に、Ｈ形鋼は、同軸上に上下水平ロ
ールと垂直ロールを備えたユニバーサル圧延機により熱
間あるいは冷間圧延にて成形される。ところが、そこで
製造されたＨ形鋼は、種々の原因で反りや曲がりあるい
はフランジとウエブの直角度不良等の形状不良を有して
おり、製品とするにはその形状を整える必要がある。そ
こで、従来よりローラストレートナやギャグ式のプレス
矯正機によって、その形状を修正している。2. Description of the Related Art Generally, H-section steel is hot- or cold-rolled by a universal rolling machine coaxially having upper and lower horizontal rolls and a vertical roll. However, the H-section steel manufactured there has a shape defect such as a warp or a bend or a defect in the perpendicularity between the flange and the web due to various causes, and it is necessary to adjust the shape in order to obtain a product. Therefore, conventionally, the shape is corrected by a roller straightener or a gag type press straightening machine.
【０００３】しかしながら、従来のローラストレートナ
は、上下に千鳥に配置された矯正用水平ローラによる圧
下でＨ形鋼の反りや曲がりを主体に修正しているが、図
３に示すように、ウエブのアール隅部を圧下する構造の
ためフランジのウエブに対する取付け角度（以下、フラ
ンジ取付け角という）が容易に変動する。特に、使用す
る矯正用水平ローラが分割幅可変ローラで、異なったサ
イズの形鋼を同一のロールで矯正する場合には、Ｈ形鋼
のサイズによってはコーナのアールがロールのアールと
完全に一致しない場合があり、直角度の確保が困難であ
る。そのため、ウエブとフランジの直角度不良は、Ｈ形
鋼をローラストレートナに通過させた後に、それ専用の
角度矯正機を配置して修正されていた。この専用機に関
しては、例えば特開昭６４−６８６２１号公報に開示さ
れたものがある。この専用機を用いての修正は、上記ロ
ーラストレートナ通過後のフランジ取付け角が常に一定
方向である場合には、その角度に応じて鋼材の剛性もど
り量（所謂スプリングバック）を配慮した傾きの付加
（やはり竪ローラを用いる）で上手く行うことができ
た。However, the conventional roller straightener mainly corrects the warp and bend of the H-section steel under pressure by the horizontal straightening rollers arranged in a zigzag pattern at the top and bottom, but as shown in FIG. Due to the structure of pressing down the rounded corners, the mounting angle of the flange with respect to the web (hereinafter referred to as the flange mounting angle) easily changes. In particular, when the horizontal roller for straightening used is a variable split width roller and straight steels of different sizes are straightened by the same roll, the corner radius is completely the same as the radius of the roll depending on the size of the H-section steel. In some cases, it is difficult to secure the squareness. Therefore, the perpendicularity defect of the web and the flange has been corrected by passing the H-section steel through the roller straightener and then arranging an angle corrector dedicated thereto. As for this dedicated machine, for example, there is one disclosed in JP-A-64-68621. If the flange mounting angle after passing through the roller straightener is always in a fixed direction, the correction using this special machine is done with consideration of the amount of rigidity return of the steel material (so-called springback) according to the angle. With the addition (again using a vertical roller), I was able to do well.
【０００４】しかしながら、上記のようにローラストレ
ートナを通過したＨ形鋼のフランジ取付け角は必ずしも
常に同一方向であるとは限らず、その角度が反対になっ
て角度矯正機に到着する場合もある。そのような状態に
なると、角度矯正機の付加するガタや剛性のもどり量が
逆になるため、角度修正が連続的でなくなり、オンライ
ンでの正確な矯正が難しくなるという問題が生じてい
た。However, as described above, the flange mounting angles of the H-section steel that has passed through the roller straightener are not always in the same direction, and there are cases where the angles are reversed and arrive at the angle straightening machine. . In such a situation, the amount of backlash added by the angle corrector and the amount of return of the rigidity are reversed, so that the angle correction is not continuous, and there is a problem that accurate online correction becomes difficult.
【０００５】なお、このフランジ取付け角の矯正方法及
び装置としては、特開昭５２−１６４５６号、特開平４
−３２２８２０号、特開平４−３５１２２４号公報等の
多数の別技術が開示されている。As a method and apparatus for correcting this flange mounting angle, Japanese Patent Laid-Open No. 52-16456 and Japanese Patent Laid-Open No. Hei 4 (1999) -2004 are known.
A number of other techniques such as Japanese Patent Laid-Open No. 322820 and Japanese Patent Laid-Open No. 4-351224 are disclosed.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、上記問題を
解決して、ローラストレートナ通過後のＨ形鋼が、フラ
ンジ取付け角度の矯正機で円滑に連続して処理されるよ
うにする方法の提供を目的としている。SUMMARY OF THE INVENTION The present invention is a method of solving the above problems so that the H-section steel after passing through the roller straightener can be smoothly and continuously processed by a straightening machine having a flange mounting angle. The purpose is to provide.
【０００７】[0007]
【課題を解決するための手段】発明者は、上記目的を達
成するために実験、研究を繰り返し、形鋼のフランジ取
付け角度の矯正機を円滑に運転するには、該角度矯正機
に挿入される形鋼の断面形状を、予めある程度揃える必
要があることを確認した。すなわち、本発明は、ローラ
ストレートナでその反りと曲がりを矯正した形鋼を、角
度矯正機にてウエブに対するフランジの取付け角を修正
するに際し、上記ローラストレートナと角度矯正機との
間に傾斜した竪ローラを配置して、上記ローラストレー
トナを通過した形鋼のウエブに対するフランジ取付け角
を一定方向に揃え、角度矯正機での矯正を連続して行う
ことを特徴とする形鋼の断面形状矯正方法である。ま
た、実際の適用に関して、本発明は、竪ローラが無駆動
であることを特徴とした請求項１記載の形鋼の断面形状
矯正方法である。Means for Solving the Problems The inventor has repeatedly conducted experiments and researches in order to achieve the above objects, and in order to smoothly operate a straightening machine for a flange mounting angle of a shaped steel, the straightening machine is inserted into the straightening machine. It was confirmed that it is necessary to make the cross-sectional shapes of the round shaped steels uniform to some extent in advance. That is, the present invention relates to a shaped steel whose roller straightener is used to correct the warp and bending, and when correcting the mounting angle of the flange with respect to the web by the angle straightening machine, tilts it between the roller straightener and the angle straightening machine. The vertical cross section of the shaped steel is characterized by arranging vertical rollers and aligning the flange mounting angle with respect to the web of the shaped steel that has passed through the roller straightener in a certain direction, and performing straightening continuously with an angle straightening machine. It is a correction method. Further, with respect to actual application, the present invention is the method for correcting the sectional shape of a shaped steel according to claim 1, characterized in that the vertical roller is not driven.
【０００８】[0008]
【作用】本発明では、ローラストレートナの直ぐ後流側
に、傾斜を有する竪ローラを配置するようにしたので、
被矯正材である形鋼が角度矯正機に掛けられる前に、該
竪ローラによって、ローラストレートナでさまざまな方
向に変化してきたフランジの取付け角の向きを常に一定
の方向に揃えることができる。その結果、最終的に角度
矯正機でウエブに対するフランジ取付け角を９０°とす
る場合、該角度矯正機に付属した竪ロールの傾動方向は
常に同じで良く、ただ被矯正材の剛性によるもどり量と
角度矯正機自体の剛性及びガタを見込んで、傾き量を設
定するだけで良い。従って、角度矯正機の操作が容易に
なり、目標とするフランジ取付け角の修正が、オンライ
ンで円滑に連続して行えるようになる。In the present invention, the vertical roller having the inclination is arranged immediately downstream of the roller straightener.
Before the shaped steel, which is the material to be straightened, is mounted on the angle straightening machine, the vertical roller can always align the direction of the mounting angle of the flange, which has changed in various directions by the roller straightener, in a constant direction. As a result, if the angle straightening machine finally sets the flange mounting angle to the web to 90 °, the vertical rolls attached to the angle straightening machine may always have the same tilting direction, and the amount of return due to the rigidity of the material to be straightened may not be the same. All that is necessary is to set the amount of tilt in consideration of the rigidity and play of the angle corrector itself. Therefore, the operation of the angle corrector is facilitated, and the target flange mounting angle can be corrected smoothly and continuously online.
【０００９】その際、被矯正材である形鋼の先端部を本
発明に係る竪ローラに噛み込ませるには、ローラストレ
ートナの駆動力が利用でき、またその尾端部の尻抜けに
は、後流側の角度矯正機竪ローラの駆動力で引き抜くこ
とができる。そのため、本発明に係る竪ローラは、駆
動、非駆動ローラのいずれでもかまわない。また、該ロ
ーラの傾斜は、ローラ軸を傾けてもよいし、また該ロー
ラ自体の直径に、長手方向に差をつけて傾かせるように
しても構わない。At this time, the driving force of the roller straightener can be used to cause the tip of the shaped steel as the material to be straightened to be caught in the vertical roller according to the present invention, and the tail end of the straightener can be removed. The angle corrector on the wake side can be pulled out by the driving force of the vertical roller. Therefore, the vertical roller according to the present invention may be either a driving roller or a non-driving roller. In addition, the roller shaft may be tilted, or the diameter of the roller itself may be tilted with a difference in the longitudinal direction.
【００１０】[0010]
【実施例】図１は、本発明に係る形鋼形状の矯正方法を
適用した冷間矯正装置群の配置を示している。まず、被
矯正材であるＨ形鋼１０をローラストレートナ２に誘導
するため、その入口で竪ローラ１、１’によって左右方
向の位置決めをする。その様子を図２に示す。次いで、
ローラストレートナ２の上・下ロール３、４によって交
互の圧下を施す。ローラストレートナ２は、図６に示す
ように、上下に千鳥配列したローラ３、４の外周面がＨ
形鋼１０のウエブ面を圧下し、主に全体反りを修正する
ものである。その際、図３に示すように、上ローラ３又
は下ローラ４の圧下によって、フランジ先端部が上ロー
ル３又は下ロール４がある方向に狭まろうと変形し、フ
ランジ取付け角が変化する。ローラストレートナ２で矯
正された後のＨ形鋼の断面形状は、矯正前の寸法や形状
で異なるし、またローラストレートナ２のローラ幅の設
定や圧下条件によって変動するものであり、同一Ｈ形鋼
でも長手方向でさまざまな角度になり得る。その様子を
図７に示す。そこで、図７に示すさまざまな断面形状の
Ｈ形鋼１０を、そのままローラーストレートナーの駆動
力でもって直ぐ後流側に配置した本発明に係る竪ローラ
５、５’に押し込んだ。このローラ５、５’は、両ロー
ラの間隔が調整可能で、Ｈ形鋼１０のウエブ高さに応じ
て設定された。そこでは、図４に示す傾きθ1 を有する
竪ローラ５、５’に、Ｈ形鋼１０のフランジ外面をそわ
せるように通過させ、フランジの取付け角の向きが竪ロ
ール通過時には一定にになるように矯正変形される。こ
の角度θ1 は、Ｈ形鋼１０が、該竪ローラ通過後にその
材質特有の剛性もどりによって逆方向にならない程度の
値とする。本実施例では、該角度θ1 をフランジ幅に対
して２°とした。本実施例では、この竪ローラ５、５’
の傾きは、ローラ長手方向の径差によってつけたが、別
の方法として長手方向で同一径のローラを、その軸を傾
けて行なっても良い。また、Ｈ形鋼１０が浮き上がらず
に安定して、その下フランジがテーブルローラ９の位置
に規制されるよう、竪ローラ５、５’は上部の径を大き
く、下部が小さいものとした。さらに、Ｈ形鋼１０のフ
ランジを傾けるとき、ウエブが下側に膨らむように変形
することを防止するため、Ｈ形鋼のウエブ下面より、高
さ調整可能な軸受１２を有するローラ１１でもって保持
するようにした。そして、このようなローラ５、５’を
通過したＨ形鋼１０のフランジ取付け角θ2 は、図４
（ｂ）の竪ローラ角度θ1 に対応するもので、ほぼ０°
〜２°となった。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the arrangement of a group of cold straightening apparatuses to which the method for straightening a shaped steel shape according to the present invention is applied. First, in order to guide the H-shaped steel 10, which is the material to be straightened, to the roller straightener 2, positioning is performed in the left-right direction by the vertical rollers 1, 1'at its entrance. The situation is shown in FIG. Then
Alternate reduction is performed by the upper and lower rolls 3 and 4 of the roller straightener 2. In the roller straightener 2, as shown in FIG.
The web surface of the shaped steel 10 is rolled to mainly correct the overall warp. At that time, as shown in FIG. 3, due to the pressing of the upper roller 3 or the lower roller 4, the flange tip end portion deforms so as to narrow in the direction in which the upper roll 3 or the lower roll 4 is present, and the flange mounting angle changes. The cross-sectional shape of the H-section steel after being straightened by the roller straightener 2 differs depending on the size and shape before straightening, and varies depending on the setting of the roller width of the roller straightener 2 and the rolling condition. Shaped steels can also have different angles in the longitudinal direction. This is shown in FIG. Therefore, H-section steels 10 having various cross-sectional shapes shown in FIG. 7 were pushed into the vertical rollers 5 and 5'according to the present invention which were immediately arranged on the downstream side by the driving force of the roller straightener. The distance between the rollers 5 and 5 ′ can be adjusted, and was set according to the web height of the H-section steel 10. There, the vertical outer surfaces of the flange of the H-shaped steel 10 are passed along vertical rollers 5, 5'having an inclination θ 1 shown in FIG. 4 so that the mounting angle of the flange becomes constant when passing through a vertical roll. Is corrected and deformed. The angle θ 1 is set to such a value that the H-shaped steel 10 does not move in the opposite direction due to the return of the rigidity peculiar to the material after passing through the vertical roller. In this embodiment, the angle θ 1 is 2 ° with respect to the flange width. In this embodiment, the vertical rollers 5, 5 '
Although the inclination is determined by the difference in diameter in the longitudinal direction of the roller, as another method, a roller having the same diameter in the longitudinal direction may be inclined with its axis inclined. Further, in order that the H-section steel 10 does not float and is stable, and the lower flange thereof is restricted to the position of the table roller 9, the vertical rollers 5, 5 ′ have a large upper diameter and a small lower diameter. Further, when the flange of the H-section steel 10 is inclined, in order to prevent the web from deforming so as to bulge downward, it is held by a roller 11 having a bearing 12 whose height can be adjusted from the lower surface of the web of the H-section steel. I decided to do it. Then, the flange mounting angle θ 2 of the H-section steel 10 that has passed through such rollers 5, 5 ′ is as shown in FIG.
This corresponds to the vertical roller angle θ 1 in (b), which is almost 0 °.
It became ~ 2 °.
【００１１】最後に、以上のようにしてフランジの傾き
θ2 が同一方向に揃ったＨ形鋼１０を、次工程の角度矯
正機６の竪ローラ７、７’で修正した。その際、図５に
示すように、該矯正機の水平ローラ８、８’はＨ形鋼１
０のウエブを支持し、竪ローラ７、７’に傾きθ3 を持
たせて、該Ｈ形鋼フランジ傾きθ2 が０°になるように
した。竪ローラ７、７’の傾動θ3 は、該矯正機に挿入
されたＨ形鋼のフランジ取付け角θ2 と反対向きに設定
されるので、前述の通りフランジ傾きθ2 が０°〜２°
であれば、竪ローラ７、７’の傾きθ3 は常にマイナス
値とし、小幅に傾動量を変化させて、精度よくフランジ
角θ2 を０°に近づけることができた。Finally, the H-section steel 10 in which the inclinations θ 2 of the flanges are aligned in the same direction as described above was corrected by the vertical rollers 7, 7'of the angle straightening machine 6 in the next step. At that time, as shown in FIG. 5, the horizontal rollers 8 and 8 ′ of the straightening machine are H-shaped steel 1
The web No. 0 was supported, and the vertical rollers 7 and 7 ′ had a tilt θ 3 so that the H-shaped steel flange tilt θ 2 became 0 °. The inclination θ 3 of the vertical rollers 7 and 7 ′ is set in the opposite direction to the flange mounting angle θ 2 of the H-shaped steel inserted in the straightening machine, so that the flange inclination θ 2 is 0 ° to 2 ° as described above.
In this case, the inclination θ 3 of the vertical rollers 7 and 7 ′ is always a negative value, and the amount of tilt can be changed in a small width to accurately bring the flange angle θ 2 close to 0 °.
【００１２】この実施例では、ローラストレートナ２と
角度矯正機６をそれぞれ近接させたので、本発明に係る
竪ローラ５、５’を非駆動のものとしたが、ローラスト
レートナ２と角度矯正機２との間隔が広い場合には、竪
ローラー５、５’自体を駆動させて、本発明が意図して
いる効果を発揮できる。なお、本実施例では、被矯正材
がＨ形鋼であったが、本発明はそれに限るものではな
く、各矯正装置で使用するローラの種類や組み合わせを
変更すれば、Ｉ形鋼、山形鋼、溝形鋼等に適用できるこ
とは、言うまでもない。In this embodiment, since the roller straightener 2 and the angle corrector 6 are brought close to each other, the vertical rollers 5, 5'according to the present invention are not driven, but the roller straightener 2 and the angle corrector are not used. When the distance from the machine 2 is wide, the vertical rollers 5 and 5 ′ themselves can be driven to exert the effect intended by the present invention. In the present embodiment, the material to be straightened was an H-shaped steel, but the present invention is not limited to this, and if the type and combination of rollers used in each straightening device is changed, an I-shaped steel or a chevron-shaped steel is obtained. Needless to say, it can be applied to channel steel and the like.
【００１３】[0013]
【発明の効果】本発明では、ローラストレートナを通過
してばらついた形鋼のウエブに対するフランジ取付け角
を、傾斜を有する竪ロールで予め同一方向に揃えておい
てから、角度矯正機に挿入することによって、オンライ
ンで円滑に且つ精度良く修正できるようになった。ま
た、本発明では、ローラストレートナ、竪ローラ、角度
矯正機を近接して配置し、竪ローラを非駆動タイプにで
きるので、従来の矯正方法よりコストが大幅に掛かるこ
とはない。According to the present invention, the flange mounting angle for the web of shaped steel that has passed through the roller straightener and has varied is preliminarily aligned in the same direction with an inclined vertical roll, and then inserted into the angle straightening machine. By doing so, it became possible to correct online smoothly and accurately. Further, in the present invention, since the roller straightener, the vertical roller and the angle straightening device are arranged close to each other and the vertical roller can be a non-driving type, the cost is not significantly increased as compared with the conventional straightening method.
【図１】本発明に係る形鋼の断面形状矯正方法を実施し
た装置の配置図である。FIG. 1 is a layout view of an apparatus for carrying out a sectional shape correcting method for a shaped steel according to the present invention.
【図２】図１のＡ−Ａ矢視断面図である。FIG. 2 is a sectional view taken along the line AA of FIG.
【図３】図１のＢ−Ｂ矢視断面図である。3 is a cross-sectional view taken along the line BB of FIG.
【図４】図１のＣ−Ｃ矢視断面図である。FIG. 4 is a cross-sectional view taken along the line CC of FIG.
【図５】図１のＤ−Ｄ矢視断面図である。5 is a cross-sectional view taken along the line DD of FIG.
【図６】ローラストレートナの上下ローラによる交互圧
下で、フランジの直角度が変動する説明図であり、
（ａ）は縦断面図、（ｂ）は正面図である。FIG. 6 is an explanatory diagram in which the squareness of the flange fluctuates under the alternate pressure of the upper and lower rollers of the roller straightener,
(A) is a longitudinal sectional view and (b) is a front view.
【図７】フランジの断面形状がさまざまである状態を示
す図である。FIG. 7 is a diagram showing a state where the cross-sectional shapes of the flanges are various.
１、１’ ローラストレートナ入口の竪ローラ ２ ローラストレートナ本体 ３ ２の上ローラ ４ ２の下ローラ ５、５’ 本発明に係る竪ローラ ６ 角度矯正機 ７、７’ ６の竪ローラ ８、８’ ６の水平ローラ ９ 形鋼の搬送テーブルローラ １０ Ｈ形鋼（被矯正材） １１ ウエブ支持ローラ １２ ローラ軸受 1, 1'Vertical roller at the entrance of roller straightener 2 Roller straightener main body 3 2 Upper roller 4 2 Lower roller 5 5'Vertical roller 6 according to the present invention 6 Angle corrector 7, 7'6 vertical roller 8, 8'6 horizontal roller 9 Conveying table roller of shaped steel 10 H shaped steel (material to be straightened) 11 Web support roller 12 Roller bearing
Claims (2)
を矯正した形鋼を、角度矯正機にてウエブに対するフラ
ンジの取付け角を修正するに際し、 上記ローラストレートナと角度矯正機との間に傾斜した
竪ローラを配置して、上記ローラストレートナを通過し
た形鋼のウエブに対するフランジ取付け角を一定方向に
揃え、角度矯正機での矯正を連続的に行うことを特徴と
する形鋼の断面形状矯正方法。1. A shaped steel, the warp and bending of which are corrected by a roller straightener, is tilted between the roller straightener and the angle corrector when the angle of the flange is fixed to the web by an angle corrector. A vertical roller is arranged so that the flange mounting angle for the web of the shaped steel that has passed through the roller straightener is aligned in a certain direction, and straightening is continuously performed by an angle straightening machine. Method.
た請求項１記載の形鋼の断面形状矯正方法。2. The method for straightening the sectional shape of a section steel according to claim 1, wherein the vertical roller is not driven.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29825793A JPH07148526A (en) | 1993-11-29 | 1993-11-29 | Method for straightening cross-sectional shape of shape steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29825793A JPH07148526A (en) | 1993-11-29 | 1993-11-29 | Method for straightening cross-sectional shape of shape steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07148526A true JPH07148526A (en) | 1995-06-13 |
Family
ID=17857287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29825793A Withdrawn JPH07148526A (en) | 1993-11-29 | 1993-11-29 | Method for straightening cross-sectional shape of shape steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07148526A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110270608A (en) * | 2019-06-25 | 2019-09-24 | 中交一公局集团有限公司 | Equipment capable of correcting welding deformation of oblique angle T beam flange plate |
| JP2021154384A (en) * | 2020-03-30 | 2021-10-07 | 日本製鉄株式会社 | Correction device and correction method for shape steel |
-
1993
- 1993-11-29 JP JP29825793A patent/JPH07148526A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110270608A (en) * | 2019-06-25 | 2019-09-24 | 中交一公局集团有限公司 | Equipment capable of correcting welding deformation of oblique angle T beam flange plate |
| JP2021154384A (en) * | 2020-03-30 | 2021-10-07 | 日本製鉄株式会社 | Correction device and correction method for shape steel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010130 |