JP4376602B2 - Metal material processing method and metal processed product - Google Patents

Metal material processing method and metal processed product Download PDF

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JP4376602B2
JP4376602B2 JP2003412325A JP2003412325A JP4376602B2 JP 4376602 B2 JP4376602 B2 JP 4376602B2 JP 2003412325 A JP2003412325 A JP 2003412325A JP 2003412325 A JP2003412325 A JP 2003412325A JP 4376602 B2 JP4376602 B2 JP 4376602B2
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JP2005169447A (en
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匡史 山下
義行 岡
流一郎 石川
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日本金属株式会社
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本発明は、建材や構造用に供される肌が美麗で、少なくとも1個所にシャープな直角曲げ部(以下「ピン角(かど)」という)を有するチャンネル、アングル、ハット鋼などの形鋼を加工する金属材料の加工方法、およびシャープなピン角を有する金属加工品に関する。   In the present invention, a shape steel such as a channel, an angle, and a hat steel having a beautiful right-angled bending portion (hereinafter referred to as “pin angle”) in at least one place is provided with beautiful skin for building materials and structures. The present invention relates to a method for processing a metal material to be processed, and a metal processed product having a sharp pin angle.

チャンネルやアングル等の形鋼を製造する方法は、熱間圧延による方法と冷間圧延による方法との2つに大別されるが、その他に熱間圧延と冷間圧延を組み合わせた方法、局部加熱して冷間圧延する方法、あるいは冷間成形(フォーミング)後に冷間圧延する方法などが知られている。   The methods of manufacturing shaped steel such as channels and angles are roughly divided into two methods: hot rolling and cold rolling, but there are other methods that combine hot rolling and cold rolling. A method of performing cold rolling by heating or a method of performing cold rolling after cold forming (forming) is known.

熱間圧延による方法は、材料の変形抵抗が小さいため直角曲げ部の内角部曲率と外角部曲率は意図するものを比較的容易に得ることはできるが、金属の溶解設備や酸洗設備を必要とし、また出来上がった表面の肌が荒れるため建材用外壁や自動車部品などの意匠性を要求される部分に使用する場合には表面研摩が必須となる。このため例えば特許文献1の方法では、中間工程に表面研摩工程を組み入れる必要がある場合もある。しかし、表面研摩工程は非常に手間が掛かり、コスト高となり、作業環境の点でも問題がある。   In the hot rolling method, since the deformation resistance of the material is small, the inner and outer corner curvatures of the right angle bend can be obtained relatively easily, but metal melting and pickling facilities are required. In addition, since the skin of the finished surface is rough, surface polishing is indispensable when it is used in a part that requires design properties such as an outer wall for building materials and automobile parts. For this reason, for example, in the method of Patent Document 1, it may be necessary to incorporate a surface polishing step into the intermediate step. However, the surface polishing process is very time-consuming, expensive, and problematic in terms of the working environment.

特許文献2には、加工硬化の生じていない凸部を中央に持つ帯状部材を冷間フォーミングでL字形に曲げ、更に水平ロールと垂直ロールにて内外頂角部分を所定のRに圧延する方法が開示されている。しかしながら、特許文献2の方法では、冷間フォーミング工程の前段で、加工硬化の生じていない凸部を中央に持つ帯状部材を熱間で製造する余分な工程を必要とすることに加え、加工硬化が生じていないとはいえ、両端部より厚さの厚い帯状部材を曲げるには通常の均一な厚みの曲げに比較して困難さを伴うことは明白である。また、曲げ終わった時に内角部にシワを生じると考えられ、発生したシワを取り除かない限り水平および垂直ロールで潰した場合、内角部にシワの潰しこみによる欠陥発生の問題点が残る。   Patent Document 2 discloses a method of bending a belt-like member having a convex portion at the center of which work hardening has not occurred into an L shape by cold forming, and further rolling an inner and outer apex angle portion to a predetermined R by a horizontal roll and a vertical roll. Is disclosed. However, in the method of Patent Document 2, in addition to the need for an extra process for manufacturing a strip-shaped member having a convex part at the center, which is not subjected to work hardening, before the cold forming process, work hardening is performed. Although it does not occur, it is obvious that it is difficult to bend a belt-like member having a thickness thicker than both ends as compared with a normal uniform thickness bend. In addition, it is considered that wrinkles are generated at the inner corners when the bending is completed, and when the generated wrinkles are crushed with horizontal and vertical rolls, there remains a problem of defect generation due to the crushing of the wrinkles at the inner corners.

特許文献3に開示されている方法では、材料の長さ方向に潰す力が逃げるため、曲げ後の外角部の二次元投影長さLpが所望する程小さくならないと考えられる。   In the method disclosed in Patent Document 3, since the crushing force in the length direction of the material escapes, it is considered that the two-dimensional projection length Lp of the outer corner after bending does not become as small as desired.

特許文献4には、ステンレス鋼帯を冷間フォーミング成形した後、アングルの辺を上下から押し潰すことにより剛性の大きい辺Aの角に近い側がそのままの形で平行移動し、内外の曲率Rの部分を含む辺B全体が辺Aの端部a1方向に変形することにより曲率Rが直線と接する部分が潰れる。この動作を各辺について行なうことにより冷間フォーミングで形成した外角部の円弧長を減少させることにより略直角の外角を有するアングルを得る方法が開示されている。
特開平4−059101号公報特開平6−246302号公報特開平6−246301号公報特開平10−005909号公報
特許文献4には、ステンレス鋼帯を冷間フォーミング成形した後、アングルの辺を上下から押し潰すことにより剛性の大きい辺Aの角に近い側がそのままの形で平行移動し、内外の曲率Rの部分を含む辺B全体が辺Aの端部a1方向に変形することにより曲率Rが直線と接する部分が潰れる。この動作を各辺について行なうことにより冷間フォーミングで形成した外角部の円弧長を減少させることにより略直角の外角を有するアングルを得る方法が開示されている。
特開平4−059101号公報特開平6−246302号公報特開平6−246301号公報特開平10−005909号公報
特許文献4には、ステンレス鋼帯を冷間フォーミング成形した後、アングルの辺を上下から押し潰すことにより剛性の大きい辺Aの角に近い側がそのままの形で平行移動し、内外の曲率Rの部分を含む辺B全体が辺Aの端部a1方向に変形することにより曲率Rが直線と接する部分が潰れる。この動作を各辺について行なうことにより冷間フォーミングで形成した外角部の円弧長を減少させることにより略直角の外角を有するアングルを得る方法が開示されている。
特開平4−059101号公報特開平6−246302号公報特開平6−246301号公報特開平10−005909号公報
特許文献4には、ステンレス鋼帯を冷間フォーミング成形した後、アングルの辺を上下から押し潰すことにより剛性の大きい辺Aの角に近い側がそのままの形で平行移動し、内外の曲率Rの部分を含む辺B全体が辺Aの端部a1方向に変形することにより曲率Rが直線と接する部分が潰れる。この動作を各辺について行なうことにより冷間フォーミングで形成した外角部の円弧長を減少させることにより略直角の外角を有するアングルを得る方法が開示されている。
特開平4−059101号公報特開平6−246302号公報特開平6−246301号公報特開平10−005909号公報
特許文献4には、ステンレス鋼帯を冷間フォーミング成形した後、アングルの辺を上下から押し潰すことにより剛性の大きい辺Aの角に近い側がそのままの形で平行移動し、内外の曲率Rの部分を含む辺B全体が辺Aの端部a1方向に変形することにより曲率Rが直線と接する部分が潰れる。この動作を各辺について行なうことにより冷間フォーミングで形成した外角部の円弧長を減少させることにより略直角の外角を有するアングルを得る方法が開示されている。
特開平4−059101号公報特開平6−246302号公報特開平6−246301号公報特開平10−005909号公報
In Patent Document 4, after forming the stainless steel strip by cold forming, the side near the corner of the side A having a large rigidity is translated as it is by crushing the side of the angle from above and below, and the curvature R of the inside and outside is When the entire side B including the portion is deformed in the direction of the end a1 of the side A, the portion where the curvature R is in contact with the straight line is crushed. A method of obtaining an angle having an outer angle substantially perpendicular by reducing the arc length of the outer corner portion formed by cold forming by performing this operation on each side is disclosed. In Patent Document 4, after forming the stainless steel strip by cold forming, the side near the corner of the side A having a large rigidity is translated as it is by crushing the side of the angle from above and below, and the curvature R of The inside and outside is When the entire side B including the portion is deformed in the direction of the end a1 of the side A, the portion where the curvature R is in contact with the straight line is crushed. A method of obtaining an angle having. an outer angle substantially perpendicular by reducing the arc length of the outer corner portion formed by cold forming by performing this operation on each side is disclosed.
JP-A-4-059101 JP-A-4-059101 JP-A-6-246302 JP-A-6-246302 JP-A-6-246301 JP-A-6-246301 Japanese Patent Laid-Open No. 10-005909 Japanese Patent Laid-Open No. 10-005909

しかし、上記特許文献1〜4のいずれの方法によっても、曲げ加工による製品では外角部の曲率Rの寸法(二次元投影長さ)が小さくシャープにならず、通常は板厚以上に留まることが多い。また、特許文献1のように熱間圧延成形によるチャンネルは外角部の曲率が比較的小さくなるが、製品表面の肌が粗くなるという問題がある。   However, according to any of the methods of Patent Documents 1 to 4, in the product by bending, the size of the curvature R of the outer corner (the two-dimensional projection length) is not small and sharp, and usually stays above the plate thickness. Many. Moreover, although the channel of a hot rolling shaping | molding like patent document 1 becomes comparatively small in the curvature of an outer corner part, there exists a problem that the skin of a product surface becomes rough.

従来のチャンネル20Cは、図8(a)に示すように、角部c1の外角曲率半径R1が大きい。このように大きな外角曲率半径R1の角部c1をもつチャンネル20Cを、例えば図9に示すように、平行に並べて、隣り合うチャンネル20Cとチャンネル20Cとの間をアーク溶接機130で溶接して建物の外壁を形成する場合に、角部c1に大きな曲率Rがついているために、溶接アーク131が2つのチャンネルの相互接触部132まで十分に入っていかず、溶接不良を生じる。   As shown in FIG. 8A, the conventional channel 20C has a large outer corner radius of curvature R1 of the corner c1. As shown in FIG. 9, for example, the channels 20C having the corners c1 having the large outer corner radius of curvature R1 are arranged in parallel, and the adjacent channels 20C and 20C are welded by the arc welder 130, as shown in FIG. When the outer wall is formed, since the corner portion c1 has a large curvature R, the welding arc 131 does not sufficiently enter the mutual contact portion 132 of the two channels, resulting in poor welding.

また、チャンネル、アングル、ハット鋼などの一般構造用軽量形鋼(JIS G 3350)は建物の外壁に取り付けられ、外装パネルとして装飾的に用いられる場合が多いことから、チャンネルの外角部c1に大きなRがついていると、ウェブ20a面と角部c1の外観がかなり違って見え、美観上から言ってもユーザーに好まれていない。フランジ20bの面を外壁として露出させる場合にもこれと同様の問題を生じる。   In addition, general structural lightweight steel (JIS G 3350) such as channel, angle, and hat steel is attached to the outer wall of a building and is often used decoratively as an exterior panel. When R is attached, the appearance of the web 20a surface and the corner portion c1 look quite different, and it is not preferred by users even from an aesthetic point of view. The same problem occurs when the surface of the flange 20b is exposed as an outer wall.

また、図10(a)に示す従来のアングル300の外角部c2についても同様の問題を生じる。さらに、図11(a)に示す従来のハット鋼400の外角部c3,c4についても同様の問題を生じる。   The same problem occurs with respect to the outer corner portion c2 of the conventional angle 300 shown in FIG. Further, the same problem occurs in the outer corner portions c3 and c4 of the conventional hat steel 400 shown in FIG.

本発明は上記の課題を解決するためになされたものであり、チャンネル、アングル、ハット鋼など形鋼の外角部の二次元投影長さLpを小さくできる金属材料の加工方法、および外角部の二次元投影長さLpが小さく、肌が美麗な金属加工品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-mentioned problems, and is a method for processing a metal material capable of reducing the two-dimensional projection length Lp of an outer corner portion of a shape steel such as a channel, an angle, and a hat steel, and two outer corner portions. An object of the present invention is to provide a metal processed product having a small dimensional projection length Lp and a beautiful skin.

上記課題を解決し目的を達成するために、本発明は以下に示す手段を用いている。   In order to solve the above problems and achieve the object, the present invention uses the following means.

(1)本発明の金属材料の加工方法は、長尺の金属素材を冷間フォーミング成形することにより、少なくとも1つの直角曲げ部を有する所定断面形状の予成形部材とする予成形工程と、冷間または温間で前記予成形部材の角部とともに該角部両側近傍の外辺部を外側に膨出させ、膨出部を有する一次成形部材を形成する第1の圧延工程と、冷間または温間で前記膨出部を角部の内側に向けて押し込み、外角部の二次元投影長さをLp、辺の厚さをt、角部の内角頂部から外角頂部までの頂部厚さをTとしたときに、0.5mm≦Lp≦0.3t、およびt<Tの関係を同時に満たす外角部を有する二次成形部材を形成する第2の圧延工程とを有することを特徴とする。 (1) A method for processing a metal material according to the present invention includes a pre-forming step of forming a long metal material into a pre-formed member having a predetermined cross-sectional shape having at least one right-angle bend by cold-forming forming a long metal material, A first rolling step of bulging the outer side portions near both sides of the corner portion together with the corner portions of the preformed member in the warm or warm state to form a primary molded member having a bulged portion; The bulging portion is pushed inwardly toward the inside of the corner, and the two-dimensional projection length of the outer corner is Lp, the thickness of the side is t, and the top thickness from the inner corner to the outer corner is T. The second rolling step of forming a secondary molded member having an outer corner portion that simultaneously satisfies the relationship of 0.5 mm ≦ Lp ≦ 0.3 t and t <T .

(2)本発明の金属材料の加工方法は、前記第1の圧延工程では、外側に膨出させる前記外辺部の長さは前記角部の両側にそれぞれの辺長さの1/2以下とする前記(1)記載の方法 (2) In the metal material processing method of the present invention, in the first rolling step, the length of the outer side portion bulged outward is 1/2 or less of the length of each side on both sides of the corner portion. The method according to (1) above .

(3)本発明の金属材料の加工方法は、前記第1の圧延工程では、前記予成形部材の内角部に当接する縦ロールのロールエッジの曲率半径Reを前記予成形部材の内角部の曲率半径Riよりも小さくする前記(1)または(2)のいずれか1記載の方法 (3) In the metal material processing method of the present invention, in the first rolling step, the curvature radius Re of the roll edge of the vertical roll contacting the inner corner of the preformed member is set to the curvature of the inner corner of the preformed member. 3. The method according to any one of (1) and (2), wherein the radius Ri is smaller than the radius Ri.

(4)本発明の金属材料の加工方法は、さらに、前記第2の圧延工程の後に、前記二次成形部材の断面形状が所望の形状となるように矯正する第3の圧延工程を有する前記(1)乃至(3)のうちいずれか1記載の方法 (4) method for processing a metallic material according to the present invention, further, after the second rolling step, said having a third rolling step of the cross-sectional shape of the secondary molded member is corrected to a desired shape The method according to any one of (1) to (3) .

(5)本発明の金属加工品は、前記(1)乃至(4)のうちいずれか1の方法を用いて成形され、外角部の二次元投影長さLpが0.5mm以上で、辺の厚さtの0.3倍以下である。 (5) The metal workpiece of the present invention is molded using any one of the methods (1) to (4), the two-dimensional projection length Lp of the outer corner is 0.5 mm or more, It is 0.3 times or less of the thickness t.

本発明は、少なくとも1つの直角曲げ部を含む種々の断面形状の形鋼、特にチャンネル、アングル、ハット鋼などの一般構造用軽量形鋼に好適に用いることができる。   The present invention can be suitably used for shape steels having various cross-sectional shapes including at least one right-angled bending portion, in particular, lightweight steel shapes for general structures such as channels, angles, and hat steels.

また、本発明は炭素鋼(軟鋼)およびステンレス鋼などの鉄系の金属材料ばかりでなく、チタン等の非鉄金属材料にも好適に用いることができる。   The present invention can be suitably used not only for ferrous metal materials such as carbon steel (soft steel) and stainless steel but also for non-ferrous metal materials such as titanium.

また、本発明は、厚さtが3〜6mmの範囲で好適に用いられ、特に厚さtが3〜4.5mmの範囲において最も好適に用いられる。なお、厚さtが3mm未満の場合であっても本発明を用いることにより同様の効果が得られるものと推察される。   Moreover, this invention is used suitably in the range whose thickness t is 3-6 mm, and is used most suitably especially in the range whose thickness t is 3-4.5 mm. Even if the thickness t is less than 3 mm, it is presumed that the same effect can be obtained by using the present invention.

なお、本明細書中において、外角部の二次元投影長さLpとは、XY面に投影した写像のX軸長さまたはY軸長さのことをいうものと定義する。   In the present specification, the two-dimensional projection length Lp at the outer corner is defined to mean the X-axis length or Y-axis length of the mapping projected onto the XY plane.

本発明によれば、少なくとも1つの直角曲げ部をもつ金属加工品において角部の外角曲率半径を小さくでき、特にチャンネルにおいて両外角部(エッジ)の曲率半径を小さくすることができるので、これを建物の外壁やエレベータホールの枠材に用いたときに一様な反射面をもつ優れた外観が得られ、また施工面でも溶接しやすいシャープな形状となる。   According to the present invention, the outer corner radius of curvature of the metal workpiece having at least one right angle bending portion can be reduced, and particularly the radius of curvature of both outer corner portions (edges) can be reduced in the channel. When used for building outer walls and elevator hall frames, it has an excellent appearance with a uniform reflection surface, and it has a sharp shape that is easy to weld on the construction surface.

また、本発明は、冷間または温間で圧延するので、熱間圧延のような表面の肌荒れが生じなくなり、表面の肌が金属光沢のある美麗な金属加工品を得ることができる。   In addition, since the present invention is rolled cold or warm, surface roughness such as hot rolling does not occur, and a beautiful metal processed product having a metallic luster on the surface can be obtained.

本願の出願人は、先願にあたる特許文献4においてアングルの外角部Rの円弧長さを小さくする方法を提案している。しかし、特許文献4の方法では、辺を潰した時にアングル内角部の表面にシワが発生する。この内角部のシワは強度に実質的な影響を及ぼすものではないが、ユーザーに亀裂と誤認されやすいため、外観上あまり好ましいものではないという不都合がある。また、特許文献4の方法では、外角部Rの円弧長さを通常の冷間フォーミング品に比べて格段に小さくできるが、元の冷間フォーミングでの外角部Rがほぼそのままの形状で残るため、あたかも面取りした外角部を有するものであるかのような印象を与える外観をもつアングルになるという問題がある。さらに、特許文献4の方法では、外角部Rを形成するときに内角部Rも小さくなるため、角部の厚さが減少するという問題も生じる。   The applicant of the present application has proposed a method of reducing the arc length of the outer corner portion R of the angle in Patent Document 4 corresponding to the prior application. However, in the method of Patent Document 4, wrinkles are generated on the surface of the angle inner corner when the side is crushed. Although the wrinkles at the inner corners do not substantially affect the strength, there is an inconvenience that they are not so preferable in appearance because they are easily mistaken for cracks by the user. In the method of Patent Document 4, the arc length of the outer corner portion R can be remarkably reduced as compared with a normal cold forming product, but the outer corner portion R in the original cold forming remains in an almost intact shape. There is a problem that the angle has an appearance that gives an impression as if it has a chamfered outer corner. Furthermore, in the method of Patent Document 4, when the outer corner portion R is formed, the inner corner portion R also becomes smaller, which causes a problem that the thickness of the corner portion is reduced.

そこで、本発明者らは、アングルと関連付けてチャンネルの製造技術に関して鋭意研究を積み重ねた結果、特許文献4の方法におけるアングルの外角部Rを小さくするときに発生する上記問題がチャンネルでも同様に発生することを見出し、この問題解決のために冷間ロールフォーミングで成形されたフォーミング・チャンネルを縦横ロール面の形状を種々変えた4方向圧延機により冷間または温間で圧延する試行錯誤を繰り返し、本発明を完成させるに至った。   Therefore, as a result of intensive research on the channel manufacturing technique in association with the angle, the present inventors similarly generate the above-mentioned problem that occurs when the outer corner portion R of the angle in the method of Patent Document 4 is reduced. In order to solve this problem, repeated trial and error in which the forming channel formed by cold roll forming is cold or warm rolled by a four-way rolling machine in which the shape of the vertical and horizontal roll surfaces is changed, is repeated. The present invention has been completed.

以下、本発明の実施例を添付の図面を参照して説明する。
図1は、本発明方法を実施するために用いた製造ラインの一例を示す概略図である。製造ライン1には上流側から順にアンコイラー3、冷間ロールフォーミング装置4、油切装置5、加熱装置6、角出し用多段圧延機8、矯正機9、切断機10、搬送テーブル11が並んでいる。本実施例では金属素材2として厚さ3mmの熱間圧延ステンレス鋼帯を用いて、製造ライン1により所定サイズのチャンネルを製造した。その製造は次のようにして行った。
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic view showing an example of a production line used for carrying out the method of the present invention. In the production line 1, an uncoiler 3, a cold roll forming device 4, an oil draining device 5, a heating device 6, a multi-stage rolling mill 8 for straightening, a straightening machine 9, a cutting machine 10, and a conveyance table 11 are arranged in order from the upstream side. Yes. In this example, a hot-rolled stainless steel strip having a thickness of 3 mm was used as the metal material 2, and a channel of a predetermined size was manufactured by the manufacturing line 1. The production was carried out as follows. FIG. 1 is a schematic view showing an example of a production line used for carrying out the method of the present invention. In the production line 1, an uncoiler 3, a cold roll forming device 4, an oil draining device 5, a heating device 6, a multi-stage rolling mill 8 for straightening, a straightening machine 9, a cutting machine 10, and a utilizing table 11 are arranged in order from the upstream side. Yes. In this example, a hot-rolled stainless steel strip having a thickness of 3 mm was used as the metal material 2, and a channel of a predetermined size was manufactured by the manufacturing line 1. The production was carried out as follows.

まず熱間圧延ステンレス鋼帯2をアンコイラー3に装着する。素材となるステンレス鋼帯2は、熱間圧延後に表面研磨工程を経て、所定の幅で長手方向に裁断した後に、アンコイラー3に装着されたものである。   First, the hot rolled stainless steel strip 2 is mounted on the uncoiler 3. The stainless steel strip 2 as a raw material is attached to the uncoiler 3 after being subjected to a surface polishing step after hot rolling and cut in the longitudinal direction with a predetermined width.

ステンレス鋼帯2は、アンコイラー3から図中の矢印方向に送り出され、コイル中継装置により中継され、入側ガイドを介して冷間ロールフォーミング装置4に入る。冷間ロールフォーミング装置4において、ステンレス鋼帯2は多段のフォーミングロールにより冷間または温間で徐々に折り曲げられ、図6(a)に示す断面形状の予成形部材20の形状に成形される。   The stainless steel strip 2 is fed from the uncoiler 3 in the direction of the arrow in the figure, relayed by the coil relay device, and enters the cold roll forming device 4 via the entry side guide. In the cold roll forming apparatus 4, the stainless steel strip 2 is gradually bent cold or warm by multi-stage forming rolls, and is formed into the shape of the preformed member 20 having a cross-sectional shape shown in FIG.

ここまでの工程は上記の特許文献3に記載された工程と実質的に同じである。但し、予成形部材20の角部c1の曲率を特許文献3記載の方法で製造された従来品のそれより大きくしている点で、本実施例の予成形工程は従来法の工程と異なっている。すなわち、図8(a)に示す従来のチャンネル20Cでは角部c1の内角曲率半径R2を板厚tと等しく(R2=t)し、外角曲率半径R1を板厚tの2倍(R1=2t)とするのに対して、図6(a)に示す予成形部材20では角部c1の内角曲率半径Riが板厚tを超え(Ri>t)、外角曲率半径Roが板厚tの2倍を超える(Ro>2t)ように冷間ロールフォーミングしている。また、予成形部材20では内角頂部から外角頂部までの頂部厚さTを従来のチャンネル20Cよりも厚くしている。さらに、外角部の二次元投影長さLpが板厚tの2倍を超える(Lp>2t)ように大きくしている。   The steps so far are substantially the same as the steps described in Patent Document 3 above. However, the preforming process of the present embodiment is different from the process of the conventional method in that the curvature of the corner portion c1 of the preformed member 20 is larger than that of the conventional product manufactured by the method described in Patent Document 3. Yes. That is, in the conventional channel 20C shown in FIG. 8A, the inner corner radius R2 of the corner c1 is equal to the plate thickness t (R2 = t), and the outer corner radius R1 is twice the plate thickness t (R1 = 2t). In contrast, in the preformed member 20 shown in FIG. 6A, the inner corner radius of curvature Ri of the corner portion c1 exceeds the thickness t (Ri> t), and the outer angle radius of curvature Ro is 2 of the thickness t. Cold roll forming is performed so as to exceed twice (Ro> 2t). Moreover, in the preforming member 20, the top thickness T from the inner corner apex to the outer corner apex is made thicker than the conventional channel 20C. Furthermore, the two-dimensional projection length Lp of the outer corner is increased so as to exceed twice the plate thickness t (Lp> 2t).

通常、冷間のロールフォーミングではロールとステンレス鋼帯2との摩擦を低減し、発熱するステンレス鋼帯2を冷却する目的で加工油(水溶性加工油)が使用されるが、次工程でステンレス鋼帯2を加熱するため、冷間ロールフォーミングが終わった時点で油切装置5にて油切りを行う。   Usually, in cold roll forming, processing oil (water-soluble processing oil) is used for the purpose of reducing friction between the roll and the stainless steel strip 2 and cooling the stainless steel strip 2 that generates heat. In order to heat the steel strip 2, the oil draining device 5 performs oil draining when the cold roll forming is completed.

油切りが行われた予成形部材20は、次の加熱装置6により少なくとも角部c1を外側から200℃以下の温度に局部加熱される。本実施例では加熱装置6として高周波誘導加熱器を用いたが、本発明はこれのみに限定されるものではなく、熱風発生装置などの他の手段を用いて加熱するようにしてもよい。この局部加熱の狙いは次工程の角出し用多段圧延機8の4方向圧延成形ロールに過度の負荷をかけずに温間で加工し易くするところにあるが、特に加熱することなく冷間で加工することも可能である。すなわち、本発明の加工方法は冷間でも温間でも実施可能である。   The preformed member 20 that has been drained is locally heated by the next heating device 6 to at least the corner c1 from the outside to a temperature of 200 ° C. or less. In the present embodiment, a high-frequency induction heater is used as the heating device 6, but the present invention is not limited to this, and heating may be performed using other means such as a hot air generator. The purpose of this local heating is to make it easy to work warmly without applying excessive load to the four-direction rolling forming roll of the multi-stage rolling mill 8 for the next step, but it is particularly cold without heating. It is also possible to process. That is, the processing method of the present invention can be carried out cold or warm.

角部c1を局部加熱された予成形部材20は、角出し用多段圧延機8に入ると、第1段の4方向圧延機81A、第2段の4方向圧延機82、第3段の4方向圧延機83を連続して通るうちに、その断面形状が図6の(a)から(b)へ、(b)から(c)へ、(c)から(d)へ次々に変わる。すなわち、第1段の圧延機81Aでは予成形部材20(図6(a))から一次成形部材201(図6(b))に成形され、第2段の圧延機82では一次成形部材201(図6(b))から二次成形部材202(図6(c))に成形され、第3段の圧延機83では二次成形部材202(図6(c))から仕上成形部材203(図6(d))に成形される。   When the preformed member 20 having locally heated the corner c1 enters the multi-stage rolling mill 8 for squaring, the first-stage four-way rolling mill 81A, the second-stage four-way rolling mill 82, and the third-stage four-rolling mill 8 While continuously passing through the directional rolling mill 83, the cross-sectional shape changes from (a) to (b), (b) to (c), and (c) to (d) in FIG. That is, in the first-stage rolling mill 81A, the preformed member 20 (FIG. 6A) is molded into the primary molded member 201 (FIG. 6B), and in the second-stage rolling mill 82, the primary molded member 201 ( 6 (b)) is formed into a secondary forming member 202 (FIG. 6 (c)). In the third-stage rolling mill 83, the secondary forming member 202 (FIG. 6 (c)) is finished with a finished forming member 203 (FIG. 6). 6 (d)).

次に、図2、図3、図6を参照して角出し用多段圧延機のうち第1段の4方向圧延機およびその作用について詳しく説明する。   Next, with reference to FIG. 2, FIG. 3, FIG. 6, the first-stage four-way rolling mill and its operation will be described in detail.

第1段の4方向圧延機81Aは、図2に示すようにワークが通過するパスラインを上下左右から取り囲むように配置された縦ロール811,812および横ロール813,814を備えている。縦ロール811,812の各軸は図示しない駆動軸にそれぞれ連結されている。上部の縦ロール811は基準水平線に平行なx1軸まわりに回転駆動され、下部の縦ロール812は基準水平線に平行なx2軸まわりに回転駆動されるようになっている。左右の横ロール813,814は回転自由に支持されたフリーロールであり、ワークの進行に従って鉛直線に平行なy1軸、y2軸まわりにそれぞれ従動回転するようになっている。   As shown in FIG. 2, the first four-way rolling mill 81 </ b> A includes vertical rolls 811 and 812 and horizontal rolls 813 and 814 that are disposed so as to surround a pass line through which a workpiece passes from above, below, left and right. Each axis of the vertical rolls 811 and 812 is connected to a drive shaft (not shown). The upper vertical roll 811 is driven to rotate about the x1 axis parallel to the reference horizontal line, and the lower vertical roll 812 is driven to rotate about the x2 axis parallel to the reference horizontal line. The left and right horizontal rolls 813 and 814 are free rolls supported to freely rotate, and are driven to rotate about the y1 axis and the y2 axis parallel to the vertical line as the work advances.

図3は第1段の4方向圧延機81Aの一部を拡大して示した概略断面図である。左右の横ロール813,814は実質的に同じ構成であるので、図では右側の横ロール814のみを示し、左側の横ロール813を省略している。   FIG. 3 is an enlarged schematic cross-sectional view showing a part of the first-stage four-direction rolling mill 81A. Since the left and right lateral rolls 813 and 814 have substantially the same configuration, only the right lateral roll 814 is shown in the figure, and the left lateral roll 813 is omitted.

上部縦ロール811は大径部および小径部を有する駆動ロールである。圧延時において大径部のロール面811aはワークのウェブ内面a1に接し、大径部のロール側面811bはワークのフランジ内面b1に接する。大径部のロールエッジは、その曲率半径Reがワーク(図6(a)の予成形部材20)の内角部の曲率半径Riより小さい(Re<Ri)。この上部縦ロール811は、圧延時にロールエッジで図6(a)に示すワーク角部c1とその近傍の内側にある余分な肉を外側に押し出すものである。ロール811の大径部と小径部との間には段付部811cが形成されている。この段付部811cは、圧延時にワークのフランジ端面a3を規定しながらフランジ20bの上方への延び出しを防ぎ、ワークの断面を所定形状に整えるものである。   The upper vertical roll 811 is a drive roll having a large diameter portion and a small diameter portion. During rolling, the roll surface 811a of the large diameter portion is in contact with the web inner surface a1 of the workpiece, and the roll side surface 811b of the large diameter portion is in contact with the flange inner surface b1 of the workpiece. The roll edge of the large diameter portion has a radius of curvature Re smaller than the radius of curvature Ri of the inner corner portion of the workpiece (pre-formed member 20 in FIG. 6A) (Re <Ri). This upper vertical roll 811 pushes out the workpiece | work corner | angular part c1 shown to Fig.6 (a) by the roll edge at the time of rolling, and the excess meat inside the vicinity to the outer side. A stepped portion 811 c is formed between the large diameter portion and the small diameter portion of the roll 811. The stepped portion 811c prevents the flange 20b from extending upward while defining the flange end surface a3 of the workpiece during rolling, and adjusts the cross section of the workpiece to a predetermined shape.

下部縦ロール812は、平坦部812a、テーパー部812bおよび凹部812cからなるロール面を有する駆動ロールである。凹部812cとワークのウェブ外面a2との間には膨出部形成用の間隙S3が形成されている。下部縦ロール812の入側では平坦部812aのみがワークのウェブ外面a2に接し、テーパー部812bおよび凹部812cはワーク20から離れて非接触の状態にあるが、出側では上部縦ロール811によって外側に押出された材料がテーパー部812bおよび凹部812cにそれぞれ接触するようになり、その結果、角部c1とその近傍のウェブ面a2が外側に膨出する。   The lower vertical roll 812 is a drive roll having a roll surface composed of a flat portion 812a, a tapered portion 812b, and a concave portion 812c. A gap S3 for forming a bulge is formed between the recess 812c and the web outer surface a2 of the workpiece. On the entry side of the lower vertical roll 812, only the flat portion 812a is in contact with the web outer surface a2 of the workpiece, and the tapered portion 812b and the recess portion 812c are in a non-contact state away from the workpiece 20, but on the exit side, the upper vertical roll 811 The material extruded in this manner comes into contact with the tapered portion 812b and the concave portion 812c, respectively, and as a result, the corner portion c1 and the web surface a2 in the vicinity thereof bulge outward.

左右の横ロール813,814は同じ構成であるので、ここでは代表して右側の横ロール814を説明する。横ロール814は大径部および小径部を有する回転自由なフリーロールである。ロール814の大径部のロール面は、上側から順に平坦部814a、テーパー部814b、凹部814cを備えており、ワーク20と接していない(実質的に非接触)。なお、横ロール814の大径部と小径部との間には段付部814dが形成されている。段付部814dは上下の縦ロール811,812の側面と接触干渉しないようになっている。   Since the right and left horizontal rolls 813 and 814 have the same configuration, the right horizontal roll 814 will be described here as a representative. The transverse roll 814 is a freely rotatable roll having a large diameter portion and a small diameter portion. The roll surface of the large-diameter portion of the roll 814 includes a flat portion 814a, a tapered portion 814b, and a concave portion 814c in this order from the upper side, and is not in contact with the workpiece 20 (substantially non-contact). A stepped portion 814d is formed between the large diameter portion and the small diameter portion of the horizontal roll 814. The stepped portion 814d is configured not to interfere with the side surfaces of the upper and lower vertical rolls 811 and 812.

大径部ロール面の平坦部814aとワークのフランジ外面b2との間には間隙S1が形成されている。この間隙S1は、縦横ロール811,814間に発生するバリを防止するためのものである。テーパー部814bおよび凹部814cはワークのフランジ外面b2から更に離れている。凹部814cとワークのフランジ外面b2との間には膨出部形成用の間隙S2が形成されている。このように横ロール814の入側では平坦部814a、テーパー部814b、凹部814cともにワーク20から離れて非接触の状態にあるが、出側では上部縦ロール811によって外側に押出された材料がテーパー部814bおよび凹部814cにそれぞれ接触するようになり、その結果、角部c1とその近傍のフランジ面b2が外側に膨出する。   A gap S1 is formed between the flat portion 814a of the large-diameter portion roll surface and the flange outer surface b2 of the workpiece. The gap S1 is for preventing burrs generated between the vertical and horizontal rolls 811 and 814. The tapered portion 814b and the recessed portion 814c are further away from the flange outer surface b2 of the workpiece. A gap S2 for forming a bulge is formed between the recess 814c and the flange outer surface b2 of the workpiece. As described above, the flat portion 814a, the tapered portion 814b, and the concave portion 814c are all in the non-contact state on the entry side of the horizontal roll 814, but the material extruded outward by the upper vertical roll 811 is tapered on the exit side. As a result, the corner portion c1 and the flange surface b2 in the vicinity thereof bulge outward.

次に、図4〜図6を参照して角出し用多段圧延機の第2段と第3段の4方向圧延機およびその作用についてそれぞれ詳しく説明する。   Next, with reference to FIG. 4 to FIG. 6, the second and third four-way rolling mills of the multi-stage rolling mill for squaring and the operation thereof will be described in detail.

第2段の4方向圧延機82は、図4に示すようにワークが通過するパスラインを上下左右から取り囲むように配置された縦ロール821,822および横ロール823,824を備えている。縦ロール821,822の各軸は図示しない駆動軸にそれぞれ連結されている。上部の縦ロール821は基準水平線に平行なx1軸まわりに回転駆動され、下部の縦ロール822は基準水平線に平行なx2軸まわりに回転駆動されるようになっている。左右の横ロール823,824は回転自由に支持されたフリーロールであり、ワークの進行に従って鉛直線に平行なy1軸、y2軸まわりにそれぞれ従動回転するようになっている。   As shown in FIG. 4, the second-stage four-direction rolling mill 82 includes vertical rolls 821 and 822 and horizontal rolls 823 and 824 that are disposed so as to surround a pass line through which a workpiece passes from above, below, left, and right. Each axis of the vertical rolls 821 and 822 is connected to a drive shaft (not shown). The upper vertical roll 821 is rotationally driven about the x1 axis parallel to the reference horizontal line, and the lower vertical roll 822 is rotationally driven about the x2 axis parallel to the reference horizontal line. The left and right horizontal rolls 823 and 824 are free rolls that are freely supported to rotate, and are driven to rotate about the y1 axis and the y2 axis parallel to the vertical line as the work advances.

図5は第2段の4方向圧延機82の一部を拡大して示した概略断面図である。左右の横ロール823,824は実質的に同じ構成であるので、図では右側の横ロール824のみを示し、左側の横ロール823を省略している。   FIG. 5 is an enlarged schematic cross-sectional view showing a part of the second-stage four-way rolling mill 82. Since the left and right lateral rolls 823 and 824 have substantially the same configuration, only the right lateral roll 824 is shown in the figure, and the left lateral roll 823 is omitted.

上部縦ロール821は大径部および小径部を有する駆動ロールである。圧延時において大径部のロール面821aはワークのウェブ内面a1に接し、大径部のロール側面821bはワークのフランジ内面b1に接する。ロール821の大径部と小径部との間には段付部821cが形成されている。この段付部821cは、圧延時にワークのフランジ端面a3を規定しながらフランジ20bの上方への延び出しを防ぎ、ワークの断面を所定形状に整えるものである。   The upper vertical roll 821 is a drive roll having a large diameter portion and a small diameter portion. During rolling, the roll surface 821a of the large diameter portion is in contact with the web inner surface a1 of the workpiece, and the roll side surface 821b of the large diameter portion is in contact with the flange inner surface b1 of the workpiece. A stepped portion 821 c is formed between the large diameter portion and the small diameter portion of the roll 821. The stepped portion 821c prevents the flange 20b from extending upward while defining the flange end surface a3 of the workpiece during rolling, and adjusts the cross section of the workpiece to a predetermined shape.

下部縦ロール822は、平坦部822aのみからなるロール面をもつ駆動ロールである。上下の縦ロール821,822によりワークのウェブ20aの全長を圧下する。その結果、外側に膨出した角部c1とその近傍のウェブ面a2の材料が内方に押し戻される。   The lower vertical roll 822 is a drive roll having a roll surface composed of only the flat portion 822a. The upper and lower vertical rolls 821 and 822 reduce the entire length of the workpiece web 20a. As a result, the material of the corner c1 bulging outward and the web surface a2 in the vicinity thereof is pushed back inward.

左右の横ロール823,824は同じ構成であるので、ここでは代表して右側の横ロール824を説明する。横ロール824は大径部および小径部を有する回転自由なフリーロールである。なお、左右の横ロール823,824の間隔は、図6(b)に示すフレア状に外側に開いたフランジ20bにロール面824aが出側で接するように設定されている。また、横ロール824の大径部と小径部との間には段付部824bが形成されている。段付部824bは上下の縦ロール821,822の側面と接触干渉しないようになっている。   Since the right and left horizontal rolls 823 and 824 have the same configuration, the right horizontal roll 824 will be described as a representative here. The transverse roll 824 is a freely rotatable roll having a large diameter portion and a small diameter portion. In addition, the space | interval of the right and left horizontal rolls 823 and 824 is set so that the roll surface 824a contacts the flange 20b opened outward in the flare shape shown in FIG. 6B. Further, a stepped portion 824 b is formed between the large diameter portion and the small diameter portion of the horizontal roll 824. The stepped portion 824b is configured not to interfere with the side surfaces of the upper and lower vertical rolls 821 and 822.

横ロール824でワークの幅方向への変位を制限しながら、上部縦ロール821によりワークのフランジ全長を圧下する。これにより、外側に膨出した角部c1とその近傍のフランジ20bの材料が内方に押し戻され、下部縦ロール822によりウェブ20aのほうから押し戻される材料と相俟ってワークの角部c1に材料(肉)が寄り集まる。その結果、図6(c)に示すように角部c1がシャープになり、外角部の二次元投影長さLpが小さい二次成形部材202となる。二次成形部材202は表面の肌が美麗であり、優れた外観を有している。   While restricting displacement in the width direction of the workpiece by the horizontal roll 824, the entire flange length of the workpiece is reduced by the upper vertical roll 821. As a result, the material of the corner c1 bulging outward and the flange 20b in the vicinity thereof is pushed back inward, and together with the material pushed back from the web 20a by the lower vertical roll 822, the material is brought into the corner c1 of the workpiece. Ingredients (meat) gather together. As a result, as shown in FIG. 6C, the corner c1 becomes sharp and the secondary molded member 202 has a small two-dimensional projection length Lp at the outer corner. The secondary molded member 202 has a beautiful surface and an excellent appearance.

図4、図5では第3段の圧延機83を第2段の圧延機82と同じように示したが、両者は横ロールが実際には異なり、第3段の圧延機83では左右の横ロールをスプリングバック矯正用のオーバーベンドロールとしている。すなわち、第2段の圧延機82の横ロールではロール面824aを平坦にしているが、第3段の圧延機83の横ロールではロール面の上部を内側に僅かに傾斜させたテーパー面としている。テーパーロール面の傾斜角度は数度程度とし、図6(c)に示す二次成形部材202のフランジ20bを内方に僅かに曲げてスプリングバックを矯正し、図6(d)に示す仕上成形部材203とする。   4 and 5, the third-stage rolling mill 83 is shown in the same manner as the second-stage rolling mill 82, but the horizontal rolls of both are actually different. The roll is an overbend roll for springback correction. That is, the roll surface 824a is flattened in the horizontal roll of the second-stage rolling mill 82, but in the horizontal roll of the third-stage rolling mill 83, the upper surface of the roll surface is a tapered surface slightly inclined inward. . The inclination angle of the taper roll surface is about several degrees, the flange 20b of the secondary forming member 202 shown in FIG. 6 (c) is slightly bent inward to correct the spring back, and finish forming shown in FIG. 6 (d). The member 203 is used.

以上のようにして外角部の二次元投影長さLpが板厚tの0.3倍以下のシャープなピン角をもつチャンネル(仕上成形部材203)が得られる。次いで、チャンネル203の捩れ、反り、横曲がり(キャンバー)を矯正機9により矯正し、チャンネル203に直線性をもたせる。次いで、これを切断機10に送り、所定の長さに切断した後に、搬出テーブル11により搬出する。   As described above, a channel (finish forming member 203) having a sharp pin angle in which the two-dimensional projection length Lp of the outer corner portion is 0.3 times or less of the plate thickness t is obtained. Next, twisting, warping, and lateral bending (camber) of the channel 203 are corrected by the correction machine 9, and the channel 203 is made linear. Subsequently, this is sent to the cutting machine 10, cut into a predetermined length, and then carried out by the carry-out table 11.

以上の成形処理はすべて図示するように連続する一連の工程で行われる。また、チャンネルの角部c1は溶接作業など実際の現場においては真に直角であればある程、作業性は良い。しかし、反面チャンネルを手で扱う場合真に直角であればある程、作業者が手を切るおそれがあり、僅かにR部を有する物の方が安全性の観点からは扱い易い。よって、本発明では外角部の二次元投影長さLpの最小値を0.5mmとすることが望ましい。   All of the above molding processes are performed in a series of steps as shown in the figure. In addition, the workability is better as the corner c1 of the channel is truly a right angle in actual work such as welding work. However, when the channel is handled by hand, there is a possibility that the worker will cut the hand as the angle is truly right, and an object having a slight R portion is easier to handle from the viewpoint of safety. Therefore, in the present invention, it is desirable that the minimum value of the two-dimensional projection length Lp at the outer corner is 0.5 mm.

(実施例1)
実施例1の供試材として熱間圧延ステンレス鋼帯(JIS G 4306, SUS304-HS, t3.0mm)を表面研磨し、スリッターにて長手方向に裁断した材料2(厚み3mm×幅132〜137mm×長さ5〜6m)を準備した。
Example 1
A material 2 (thickness 3 mm × width 132 to 137 mm) obtained by polishing a surface of a hot rolled stainless steel strip (JIS G 4306, SUS304-HS, t3.0 mm) as a test material of Example 1 and cutting it in a longitudinal direction with a slitter. X Length 5-6 m) was prepared.

上記ステンレス鋼帯材料2を冷間ロールフォーミング装置4に通過させることにより、図6(a)に示した予成形チャンネル20を得た。予成形チャンネル20は、厚みt1が3mm、フランジ長さB1が27〜28mm、ウェブ長さH1が62mm、外角部曲率半径Roが5〜6mmであった。   By passing the stainless steel strip material 2 through a cold roll forming device 4, a preformed channel 20 shown in FIG. 6 (a) was obtained. The preformed channel 20 had a thickness t1 of 3 mm, a flange length B1 of 27 to 28 mm, a web length H1 of 62 mm, and an outer corner radius of curvature Ro of 5 to 6 mm.

ゴム製ワイパー(油切装置5)により予成形チャンネル20から水溶性加工油を取り除いた後、高周波誘導加熱装置(加熱装置6)にて材料温度(チャンネル角部c1の温度)が170〜190℃になるように局部加熱し、これを第1段、第2段、第3段の4方向圧延機81A,82,83に連続して通過させた。   After removing the water-soluble processing oil from the pre-formed channel 20 with a rubber wiper (oil removal device 5), the material temperature (the temperature at the channel corner c1) is 170 to 190 ° C. with the high frequency induction heating device (heating device 6). It was heated locally so that it was continuously passed through four-direction rolling mills 81A, 82, 83 of the first, second, and third stages.

本実施例の角出し用多段圧延機として、上部縦ロールの大径部の直径D1を230〜250mm程度、上部縦ロールの小径部の直径D2を180〜200mm程度、上部縦ロールの段付部の長さを8〜10mm程度、上部縦ロールのロールエッジの曲率半径Reを0.5〜1.0mmの範囲とし、下部縦ロールの平坦部の直径を210〜230mm程度とし、横ロールの大径部の直径D3を60〜70mm程度、横ロールの小径部の直径D4を40〜50mm程度、横ロールの段付部の長さを5〜7mm程度とした3段の4方向圧延機を用いた。   As the multi-stage rolling mill for cornering of this embodiment, the diameter D1 of the large diameter portion of the upper vertical roll is about 230 to 250 mm, the diameter D2 of the small diameter portion of the upper vertical roll is about 180 to 200 mm, and the stepped portion of the upper vertical roll The length of the roll is about 8 to 10 mm, the radius of curvature Re of the roll edge of the upper vertical roll is in the range of 0.5 to 1.0 mm, the diameter of the flat part of the lower vertical roll is about 210 to 230 mm, A three-stage four-way rolling mill is used in which the diameter D3 of the diameter part is about 60 to 70 mm, the diameter D4 of the small diameter part of the horizontal roll is about 40 to 50 mm, and the length of the stepped part of the horizontal roll is about 5 to 7 mm. It was.

また、本実施例では、横ロールの平坦部の長さL1を10〜15mm程度、テーパー部の長さL2を8〜10mm、横ロールのテーパー部の傾斜角θ1を鉛直線に対して数度だけ傾け、凹部の長さL3を4〜6mm、圧延前のワークと横ロールの平坦部との間隙S1を0.4〜0.6mm、圧延前のワークと横ロールの凹部との間隙S2を0.7〜0.9mmとした。   In this embodiment, the length L1 of the flat portion of the transverse roll is about 10 to 15 mm, the length L2 of the tapered portion is 8 to 10 mm, and the inclination angle θ1 of the tapered portion of the transverse roll is several degrees with respect to the vertical line. The concave portion length L3 is 4 to 6 mm, the gap S1 between the workpiece before rolling and the flat portion of the transverse roll is 0.4 to 0.6 mm, and the gap S2 between the workpiece before rolling and the concave portion of the transverse roll is It was set to 0.7 to 0.9 mm.

さらに、本実施例では、下部縦ロールのテーパー部の長さL5を8〜10mm、下部縦ロールのテーパー部の傾斜角θ2を基準水平線に対して数度だけ傾け、下部縦ロールの凹部の長さL4を10〜12mm、圧延前のワークと下部縦ロールの凹部との間隙S3を0.5〜0.7mmとした。   Further, in this embodiment, the length L5 of the taper portion of the lower vertical roll is 8 to 10 mm, the inclination angle θ2 of the taper portion of the lower vertical roll is inclined by several degrees with respect to the reference horizontal line, and the length of the concave portion of the lower vertical roll is The thickness L4 was 10 to 12 mm, and the gap S3 between the workpiece before rolling and the concave portion of the lower vertical roll was 0.5 to 0.7 mm.

なお、第1段、第2段、第3段の4方向圧延機81A,82,83の各縦横ロールのセッティング位置は、上記の予成形チャンネル20のサイズ(厚み3mm、フランジ長さ27〜28mm、ウェブ長さ62mm)により予め定められたロール寸法及びロール間隔に従って調整した。   The setting positions of the vertical and horizontal rolls of the first, second, and third stage four-direction rolling mills 81A, 82, and 83 are the size of the preforming channel 20 (thickness 3 mm, flange length 27 to 28 mm). The web length was adjusted according to the roll dimension and roll interval determined in advance by 62 mm).

すなわち、第1段の4方向圧延機81Aでは上部縦ロール811の大径部と下部縦ロール812との間隔を3mmにセットすれば、上部縦ロールの段付部811cと下部縦ロール812との間隔は27〜28mmとなるように上部縦ロール811は製作されている。ただし、段付部811cは予成形チャンネル20のフランジ端面a3に対して非接触とし、0.5mm〜1mm程度離した位置にくるように縦ロール811,812をセットした。一方、左側の横ロール813と右側の横ロール814との間隔は、バリ防止用の間隙S1(0.5mm)を考慮して所望値に設定した。これら2組4個のロール811,812,813,814は、開先を付けたフォーミング材を通しても設定した値が変化しないようにロールハウジング、ロールのジャーナル部など充分な剛性を持っている。   That is, in the first-stage four-direction rolling mill 81A, if the interval between the large diameter portion of the upper vertical roll 811 and the lower vertical roll 812 is set to 3 mm, the stepped portion 811c of the upper vertical roll and the lower vertical roll 812 The upper vertical roll 811 is manufactured so that the interval is 27 to 28 mm. However, the stepped portion 811c was not in contact with the flange end surface a3 of the pre-formed channel 20, and the vertical rolls 811 and 812 were set so as to be positioned at a distance of about 0.5 mm to 1 mm. On the other hand, the distance between the left lateral roll 813 and the right lateral roll 814 was set to a desired value in consideration of the burr preventing gap S1 (0.5 mm). These two sets of four rolls 811, 812, 813, and 814 have sufficient rigidity such as a roll housing and a roll journal so that the set value does not change even through a forming material with a groove.

第2段の4方向圧延機82の縦ロール821,822は第1段の4方向圧延機81Aのそれとほぼ同様に設定した。但し、左側の横ロール823と右側の横ロール824との間隔は、ワークのフランジ部20bの反りを考慮して所望値に設定した。   The longitudinal rolls 821 and 822 of the second-stage four-direction rolling mill 82 were set in substantially the same manner as that of the first-stage four-direction rolling mill 81A. However, the distance between the left lateral roll 823 and the right lateral roll 824 was set to a desired value in consideration of the warpage of the flange portion 20b of the workpiece.

第3段の4方向圧延機83の縦ロール831,832は第2段の4方向圧延機82のそれとほぼ同様に設定した。但し、左側の横ロール833と右側の横ロール834との間隔は、ワークのフランジ部20bの反りを考慮して所望値に設定した。   The vertical rolls 831 and 832 of the third-stage four-direction rolling mill 83 were set in substantially the same manner as that of the second-stage four-direction rolling mill 82. However, the distance between the left lateral roll 833 and the right lateral roll 834 was set to a desired value in consideration of the warp of the flange portion 20b of the workpiece.

ワークは、角出し用多段圧延機8に入ると、第1段の4方向圧延機81A、第2段の4方向圧延機82、第3段の4方向圧延機83を連続して通るうちに、その断面形状が図6の(a)から(b)へ、(b)から(c)へ、(c)から(d)へ次々に変えられる。すなわち、第1段の圧延機81Aでは、上部縦ロール811によって外側に押出された材料がテーパー部814bおよび凹部814cにそれぞれ規制されて、角部c1とその近傍のフランジ面b2を外側に膨出させる一方で、上部縦ロール811によって外側に押出された材料がテーパー部812bおよび凹部812cにそれぞれ規制されて、角部c1とその近傍のウェブ面a2を外側に膨出させた。このように一次成形ワーク201では角部の厚さTを予め厚くし、角部c1に余分の材料(余肉)をため込んでおく。   When the workpiece enters the multi-stage rolling mill 8 for squaring, the workpiece passes through the first four-way mill 81A, the second four-way mill 82, and the third four-way mill 83 continuously. The cross-sectional shape is sequentially changed from (a) to (b) in FIG. 6, from (b) to (c), and from (c) to (d). That is, in the first-stage rolling mill 81A, the material extruded outward by the upper vertical roll 811 is regulated by the tapered portion 814b and the concave portion 814c, respectively, and the corner portion c1 and the flange surface b2 in the vicinity thereof bulge outward. On the other hand, the material extruded outward by the upper vertical roll 811 was regulated by the tapered portion 812b and the concave portion 812c, respectively, and the corner portion c1 and the web surface a2 in the vicinity thereof were bulged outward. As described above, in the primary molded workpiece 201, the thickness T of the corner portion is increased in advance, and extra material (extra-wall) is accumulated in the corner portion c1.

第2段の圧延機82では、横ロール824でワークの幅方向への変位を制限しながら、上部縦ロール821によりワークのフランジ全長を圧下した。これにより、外側に膨出した角部c1とその近傍のフランジ20bの材料が内方に押し戻され、下部縦ロール822によりウェブ20aのほうから押し戻される材料と相俟ってワークの角部c1に材料(肉)を寄り集めた。その結果、図6(c)に示すように角部c1がシャープになり、外角部の二次元投影長さLpが小さくなった。この二次成形ワーク202は表面の肌が美麗であり、優れた外観を有していた。   In the second-stage rolling mill 82, the flange length of the workpiece was reduced by the upper vertical roll 821 while restricting displacement in the width direction of the workpiece by the horizontal roll 824. As a result, the material of the corner c1 bulging outward and the flange 20b in the vicinity thereof is pushed back inward, and together with the material pushed back from the web 20a by the lower vertical roll 822, the material is brought into the corner c1 of the workpiece. Collected ingredients (meat). As a result, as shown in FIG. 6C, the corner c1 became sharper and the two-dimensional projection length Lp of the outer corner became smaller. The secondary molded workpiece 202 had a beautiful surface and an excellent appearance.

フランジ先端部のフレア状の反りは第3段の4方向圧延機83を通すことにより矯正した。第3段の4方向圧延機83の横ロールは、チャンネルフランジ20bのスプリングバックを矯正するオーバーベンドロールとして機能するものであり、下方から上方に向けて僅かに増径するテーパー状のロール面を備えている。本実施例ではテーパー状ロール面の鉛直線に対する傾斜角度を数度の程度とした。   The flare-like warp at the flange tip was corrected by passing through a third-stage four-way rolling machine 83. The horizontal roll of the third-stage four-direction rolling mill 83 functions as an overbend roll that corrects the spring back of the channel flange 20b, and has a tapered roll surface that slightly increases in diameter from below to above. I have. In this embodiment, the inclination angle of the tapered roll surface with respect to the vertical line is set to several degrees.

このような第3段の圧延機83により二次成形ワーク202のフランジ20bを内方に僅かに曲げてスプリングバックを矯正し、図6(d)に示すワーク203に仕上げた。第3段の圧延機83を通過した図6(d)に示す仕上成形ワーク203は、厚みt3、フランジ長さB3、ウェブ長さH3は図6(c)に示す二次成形ワーク202と実質的に同じであり、外角部c1の二次元投影長さLp(XY面に投影した写像のX軸長さ又はY軸長さ)が0.6〜0.8mmであるチャンネル203を得た。   With such a third-stage rolling mill 83, the flange 20b of the secondary formed workpiece 202 was slightly bent inward to correct the spring back, and the workpiece 203 shown in FIG. 6 (d) was finished. The finished formed work 203 shown in FIG. 6 (d) that has passed through the third-stage rolling mill 83 has a thickness t3, a flange length B3, and a web length H3 that are substantially the same as those of the secondary formed work 202 shown in FIG. 6 (c). Thus, a channel 203 was obtained in which the two-dimensional projection length Lp (X-axis length or Y-axis length of the map projected on the XY plane) of the outer corner portion c1 is 0.6 to 0.8 mm.

本実施例で得たチャンネル203は、フランジ長さB3が25mm、ウェブ長さH3が50mm、厚みtが3mmであり、図7に示す外角部の二次元投影長さLpが0.5mm以上0.3t以下の関係を満足するシャープな形状のピン角を有するものであった。なお、外角部の二次元投影長さLpは、例えばレーザ距離計のような光学機器を用いて非破壊的に測定した。   The channel 203 obtained in this example has a flange length B3 of 25 mm, a web length H3 of 50 mm, a thickness t of 3 mm, and a two-dimensional projection length Lp of the outer corner shown in FIG. It had a sharp pin angle satisfying the relationship of .3t or less. The two-dimensional projection length Lp at the outer corner was measured nondestructively using an optical device such as a laser distance meter.

また、本実施例で得たチャンネル203は、肉眼による外観検査の結果が非常に良好であり、ウェブおよびフランジともに金属光沢のある美麗な表面肌を有するものであった。 Further, the channel 203 obtained in this example had a very good appearance inspection result with the naked eye, and both the web and the flange had a beautiful surface skin with metallic luster.

(実施例2)
実施例2として、上記の実施例1と同じ材料を準備し、冷間ロールフォーミング後に引き続き冷間で3段の角出し圧延を行った。 As Example 2, the same material as in Example 1 above was prepared, and after cold roll forming, three-stage square rolling was subsequently performed cold. 本実施例2では、角出し圧延前に材料をまったく加熱することなく冷間圧延を行うことを除いては、上記実施例1と同一の条件で製造した。 In the second embodiment, the production was carried out under the same conditions as in the first embodiment, except that the material was cold-rolled without being heated at all before the square rolling. (Example 2) (Example 2)
As Example 2, the same material as that of Example 1 was prepared, and after the cold roll forming, three-stage square rolling was performed in the cold. In the present Example 2, it manufactured on the same conditions as the said Example 1 except performing cold rolling, without heating a material at all before square rolling. As Example 2, the same material as that of Example 1 was prepared, and after the cold roll forming, three-stage square rolling was performed in the cold. In the present Example 2, it manufactured on the same conditions as the said Example 1 except performing cold rolling, without heating a material at all before square rolling.

本実施例2のサンプルを調べたところ実施例1のサンプルと比べて外観および機械的強度ともに遜色ない結果が得られた。しかし、実施例2(冷間角出し圧延)は実施例1(温間角出し圧延)に比べてロールの消耗が著しくなり、作業性が低下した。また、実施例2の方法は実施例1に比べて歩留まりが低かった。 When the sample of this Example 2 was investigated, the external appearance and mechanical strength compared with the sample of Example 1 were obtained. However, in Example 2 (cold squeezing rolling), the roll was significantly consumed compared to Example 1 (warm squeezing rolling), and workability was reduced. Moreover, the method of Example 2 had a low yield compared to Example 1.

(比較例)
次に、比較例について説明する。 Next, a comparative example will be described. なお、比較例が上記の実施例と重複する部分の説明は省略する。 The description of the part where the comparative example overlaps with the above embodiment will be omitted.
比較例では、第1段の圧延を除いて、圧延条件および加熱条件など他の条件は上記の実施例と同じとした。 In the comparative example, other conditions such as rolling conditions and heating conditions were the same as those in the above embodiment except for the first stage rolling. 比較例の第1段の4方向圧延機として、上記実施例の第1段の4方向圧延機の横ロールおよび下部縦ロールのロール面をそれぞれ変えたものを用いた。 As the first-stage four-direction rolling mill of the comparative example, those in which the roll surfaces of the horizontal roll and the lower vertical roll of the first-stage four-direction rolling mill of the above embodiment were changed were used. すなわち、比較例の第1段の4方向圧延機では、横ロールの凹部の長さL3を4〜5mm、圧延前のワークと横ロールの平坦部との間隙S1を0.4〜0.6mm、圧延前のワークと横ロールの凹部との間隙S2を1.5〜1.6mmとし、下部縦ロールのテーパー部の合計長さL5を2〜4mm、下部縦ロールの凹部の長さL4を10〜12mm、圧延前のワークと下部縦ロールの凹部との間隙S3を0.7〜0.9mmとし、上部縦ロールのロールエッジの曲率半径Reを0.5mmとした。 That is, in the first-stage four-way rolling mill of the comparative example, the length L3 of the recess of the horizontal roll is 4 to 5 mm, and the gap S1 between the work before rolling and the flat portion of the horizontal roll is 0.4 to 0.6 mm. The gap S2 between the work before rolling and the concave portion of the horizontal roll is 1.5 to 1.6 mm, the total length L5 of the tapered portion of the lower vertical roll is 2 to 4 mm, and the length L4 of the concave portion of the lower vertical roll is set. The gap S3 between the work before rolling and the recess of the lower vertical roll was set to 10 to 12 mm, the radius of curvature Re of the roll edge of the upper vertical roll was set to 0.5 mm. なお、第2段、第3段の4方向圧延機は上記実施例と同じものを用いた。 The same four-direction rolling mills used in the second and third stages as in the above embodiment were used. (Comparative example) (Comparative example)
Next, a comparative example will be described. In addition, description of the part which a comparative example overlaps with said Example is abbreviate | omitted. Next, a comparative example will be described. In addition, description of the part which a comparative example overlaps with said Example is abbreviate | omitted.
In the comparative example, except for the first stage rolling, the other conditions such as the rolling condition and the heating condition were the same as those in the above example. As the first-stage four-direction rolling mill of the comparative example, one in which the roll surfaces of the horizontal roll and the lower vertical roll of the first-stage four-direction rolling mill of the above-described example were changed was used. That is, in the first-stage four-direction rolling mill of the comparative example, the length L3 of the concave portion of the horizontal roll is 4 to 5 mm, and the gap S1 between the workpiece before rolling and the flat portion of the horizontal roll is 0.4 to 0.6 mm. The gap S2 between the workpiece before rolling and the concave portion of the horizontal roll is 1.5 to 1.6 mm, the total length L5 of the tapered portion of the lower vertical roll is 2 to 4 mm, and the concave length L4 of the lower vertical roll is The gap S3 between the workpiec In the comparative example, except for the first stage rolling, the other conditions such as the rolling condition and the heating condition were the same as those in the above example. As the first-stage four-direction rolling mill of the comparative example, one In which the roll surfaces of the horizontal roll and the lower vertical roll of the first-stage four-direction rolling mill of the above-described example were changed was used. That is, in the first-stage four-direction rolling mill of the comparative example, the length L3 of the concave portion of the horizontal roll is 4 to 5 mm, and the gap S1 between the workpieces before rolling and the flat portion of the horizontal roll is 0.4 to 0.6 mm. The gap S2 between the workpieces before rolling and the concave portion of the horizontal roll is 1.5 to 1.6 mm, the total length L5 of the tapered portion of the lower vertical roll is 2 to 4 mm, and the concave length L4 of the lower vertical roll is The gap S3 between the workpiec e before rolling and the concave portion of the lower vertical roll was 0.7 to 0.9 mm, and the curvature radius Re of the roll edge of the upper vertical roll was 0.5 mm. In addition, the same thing as the said Example was used for the 4 direction rolling mill of the 2nd stage and the 3rd stage. e before rolling and the concave portion of the lower vertical roll was 0.7 to 0.9 mm, and the curvature radius Re of the roll edge of the upper vertical roll was 0.5 mm. In addition, the same thing as the said Example was used for the 4 direction rolling mill of the 2nd stage and the 3rd stage.

このような比較例の角出し用3段圧延機を用いて上記実施例と同一サイズ、同一材質の予成形部材20を角出し圧延した。比較例の方法を用いて成形した図8(b)に示す一次成形チャンネル20Bは膨出部が過大になり、最終の仕上製品としてウェブ20aおよびフランジ20bのそれぞれに膨出部と平坦部との境界に沿って筋状の線欠陥が明りょうに生じた。この線欠陥はチャンネルの外観上の美観を大きく損なうものであった。線欠陥の発生原因は、下部縦ロールと横ロールにおいて平坦部からテーパー部への移行が急激であったこと、および間隙S2,S3が大きすぎたことに因るものであると考えられる。すなわち比較例では、図8(b)に示すように、第1の圧延工程での外側への膨出量が過大になり(肉の溜め過ぎ)、角部c1に膨出した部分を第2の圧延工程で内側へ十分に押込むことができなかったものと考えられる。   The preformed member 20 having the same size and the same material as the above-described example was square-rolled by using such a three-stage rolling mill for squaring. The primary forming channel 20B shown in FIG. 8B formed using the method of the comparative example has an excessively expanded portion, and the final finished product includes a web 20a and a flange 20b. A streak line defect clearly appeared along the boundary. This line defect greatly detracted from the appearance of the channel. The cause of the occurrence of the line defect is considered to be that the transition from the flat portion to the taper portion is abrupt in the lower vertical roll and the horizontal roll, and that the gaps S2 and S3 are too large. That is, in the comparative example, as shown in FIG. 8B, the amount of outward bulge in the first rolling process becomes excessive (too much meat accumulation), and the portion bulged to the corner c1 is the second portion. It is thought that it was not able to be fully pushed inward in the rolling process.

この比較例と上記実施例との比較考察から、次にかかげる事項を一応の結論として導き出せた。
(i)ロール面とワーク外角部との間に大きな間隙を設けることは逆効果となるので、ロール面における凹部の凹みを適正量とする。
From the comparative consideration between this comparative example and the above example, the following matters could be derived as a conclusion.
(I) Providing a large gap between the roll surface and the outer corner of the work has an adverse effect, so that the recess in the roll surface has an appropriate amount.

(ii)ロール面の平坦部から凹部へ急激に移行させることは逆効果となるので、テーパー部の傾斜角度を緩やかにして、テーパー部の長さを十分に長くする。 (Ii) Since the abrupt transition from the flat portion of the roll surface to the concave portion has an adverse effect, the inclination angle of the taper portion is moderated to sufficiently increase the length of the taper portion.

本発明はチャンネル以外の他の形鋼、例えばアングルやハット鋼にも適用することができる。 The present invention can also be applied to shapes other than the channel, such as angle and hat steel.

図10(a)は従来の方法により製造したアングルの概略断面図であり、図10(b)は本発明の方法により製造したアングルの概略断面図である。従来品300の外角部c2の曲率半径R1は板厚tの0.3倍以下を満足しない(R1>0.3t)のに対して、本発明品301の外角部c2の二次元投影長さLpは板厚tの0.3倍以下を満足するものであった(Lp≦0.3t)。   FIG. 10A is a schematic sectional view of an angle manufactured by a conventional method, and FIG. 10B is a schematic sectional view of an angle manufactured by the method of the present invention. The curvature radius R1 of the outer corner portion c2 of the conventional product 300 does not satisfy 0.3 times or less of the plate thickness t (R1> 0.3t), whereas the two-dimensional projection length of the outer corner portion c2 of the product 301 of the present invention. Lp satisfied 0.3 times or less of the plate thickness t (Lp ≦ 0.3t).

図11(a)は従来の方法により製造したハット鋼の概略断面図であり、(b)は本発明の方法により製造したハット鋼の概略断面図である。従来品400の外角部c3の曲率半径R1は板厚tの0.3倍以下を満足しない(R1>0.3t)のに対して、本発明品401の外角部c3の二次元投影長さLpは板厚tの0.3倍以下を満足するものであった(Lp≦0.3t)。   FIG. 11A is a schematic cross-sectional view of a hat steel manufactured by a conventional method, and FIG. 11B is a schematic cross-sectional view of a hat steel manufactured by the method of the present invention. The curvature radius R1 of the outer corner portion c3 of the conventional product 400 does not satisfy 0.3 times or less the plate thickness t (R1> 0.3t), whereas the two-dimensional projection length of the outer corner portion c3 of the product 401 of the present invention 401. Lp satisfied 0.3 times or less of the plate thickness t (Lp ≦ 0.3t).

本発明は、種々の断面形状をもつ形鋼、特にチャンネル、アングル、ハット鋼などの一般構造用軽量形鋼に利用され、材質としては炭素鋼およびステンレス鋼などの鉄系金属材料のみに限定されず、チタンなどの非鉄金属材料にも利用されるものである。   The present invention is used for structural steels having various cross-sectional shapes, particularly lightweight structural steels for general structures such as channels, angles, and hat steels, and is limited to ferrous metal materials such as carbon steel and stainless steel. It is also used for non-ferrous metal materials such as titanium.

本発明の実施の形態に係る金属材料の加工方法に用いた製造ラインの概略図。 Schematic of the manufacturing line used for the processing method of the metal material which concerns on embodiment of this invention. 本発明の実施の形態に係る金属材料の加工方法に用いた第1段の4方向圧延機を示す概略断面図。 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 図2に示す第1段の4方向圧延機の主要部を示す拡大断面図。 The expanded sectional view which shows the principal part of the four-way rolling mill of the 1st stage shown in FIG. 本発明の実施の形態に係る金属材料の加工方法に用いた第2段以降の4方向圧延機を示す概略断面図。 The schematic sectional drawing which shows the 4 direction rolling mill after the 2nd stage used for the processing method of the metal material which concerns on embodiment of this invention. 図4に示す第2段以降の4方向圧延機の主要部を示す拡大断面図。 The expanded sectional view which shows the principal part of the 4 direction rolling mill after the 2nd stage shown in FIG. (a)〜(d)は本発明の実施の形態に係る金属材料の加工方法を示すフローチャート。 (A)-(d) is a flowchart which shows the processing method of the metal material which concerns on embodiment of this invention. 本発明方法を用いて加工したチャンネルの曲げ部分を拡大して示す図。 The figure which expands and shows the bending part of the channel processed using the method of this invention. (a)は従来のチャンネルの概略断面図、(b)は比較例のチャンネルの概略断面図。 (A) is a schematic sectional drawing of the conventional channel, (b) is a schematic sectional drawing of the channel of a comparative example. 従来のチャンネルを並べて溶接するときの欠点を説明するための概略断面図。 The schematic sectional drawing for demonstrating the fault at the time of arranging and welding the conventional channel side by side. (a)は従来のアングルの概略断面図、(b)は本発明のアングルの概略断面図。 (A) is a schematic sectional drawing of the conventional angle, (b) is a schematic sectional drawing of the angle of this invention. (a)は従来のハット鋼の概略断面図、(b)は本発明のハット鋼の概略断面図。 (A) is a schematic sectional drawing of the conventional hat steel, (b) is a schematic sectional drawing of the hat steel of this invention.

符号の説明Explanation of symbols

3…アンコイラー4…冷間ロールフォーミング装置5…油切装置6…加熱装置8…角出し用多段圧延機81A…第1段の4方向圧延機(実施例)
82…第2段の4方向圧延機83…第3段の4方向圧延機811,812,821,822…縦ロール813,814,823,824…横ロール811a,812a,814a,821a,822a,824a…ロール面の平坦部812b,814b…ロール面のテーパー部812c,814c…ロール面の凹部811b,812d,821b,822b…ロール側面9…矯正機10…切断機20…予成形部材(角出し加工前のフォーミング・チャンネル) 82 ... 2nd stage 4-way rolling mill 83 ... 3rd-stage 4-way rolling mill 811, 812, 821, 822 ... Vertical roll 815,814,823,824 ... Horizontal rolls 811a, 812a, 814a, 821a, 822a, 824a ... Flat portions of the roll surface 812b, 814b ... Tapered portions of the roll surface 812c, 814c ... Recesses of the roll surface 811b, 812d, 821b, 822b ... Roll side surface 9 ... Straightening machine 10 ... Cutting machine 20 ... Preformed member (squared) Forming channel before processing)
201…一次成形部材(一次成形ワーク) 201 ... Primary molding member (primary molding work)
202…二次成形部材(二次成形ワーク) 202 ... Secondary forming member (secondary forming work)
203…仕上成形部材(仕上成形ワーク) 203 ... Finish molding member (finish molding work)
20B…比較例のチャンネル20C…従来のチャンネル300…従来のアングル301…本発明のアングル400…従来のハット鋼401…本発明のハット鋼S1〜S6…間隙a1〜a3,b1〜b3…ワークの各面c1〜c4…角部(直角曲げ部) 20B ... Channel 20C of the comparative example ... Conventional channel 300 ... Conventional angle 301 ... Angle 400 of the present invention ... Conventional hat steel 401 ... Hat steel of the present invention S1 to S6 ... Gap a1 to a3, b1 to b3 ... Each surface c1 to c4 ... Corner portion (right angle bent portion)
Lp…二次元投影長さDESCRIPTION OF SYMBOLS 3 ... Uncoiler 4 ... Cold roll forming apparatus 5 ... Oil draining apparatus 6 ... Heating apparatus 8 ... Multi-stage rolling mill 81A for a cornering ... First-stage four-way rolling mill (Example) Lp ... 2D projection length DEVICE OF SYMBOLS 3 ... Uncoiler 4 ... Cold roll forming apparatus 5 ... Oil draining apparatus 6 ... Heating apparatus 8 ... Multi-stage rolling mill 81A for a cornering. .. First-stage four-way rolling mill (Example)
82 ... Second-stage four-way rolling mill 83 ... Third-stage four-way rolling mills 811, 812, 821, 822 ... Vertical rolls 813, 814, 823, 824 ... Horizontal rolls 811a, 812a, 814a, 821a, 822a, 824a: flat portions 812b, 814b of roll surface, tapered portions 812c, 814c of roll surface, concave portions 811b, 812d, 821b, 822b of roll surface, roll side surface 9, straightening machine 10, cutting machine 20, pre-formed member (square shape) Forming channel before processing) 82 ... Second-stage four-way rolling mill 83 ... Third-stage four-way rolling mills 811, 812, 821, 822 ... Vertical rolls 813, 814, 823, 824 ... Horizontal rolls 811a, 812a, 814a, 821a, 822a, 824a: flat portions 812b, 814b of roll surface, tapered portions 812c, 814c of roll surface, concave portions 811b, 812d, 821b, 822b of roll surface, roll side surface 9, straightening machine 10, cutting machine 20, pre-formed member (square shape) Forming channel before processing)
201: Primary molding member (primary molding workpiece) 201: Primary molding member (primary molding workpiece)
202 ... Secondary molded member (secondary molded workpiece) 202 ... Secondary molded member (secondary molded workpiece)
203 ... Finished molded member (finished molded workpiece) 203 ... Finished molded member (finished molded workpiece)
20B ... Comparative channel 20C ... Conventional channel 300 ... Conventional angle 301 ... Invention angle 400 ... Conventional hat steel 401 ... Invention hat steel S1 to S6 ... Gap a1 to a3, b1 to b3 Each surface c1 to c4 ... corner (right angle bend) 20B ... Comparative channel 20C ... Conventional channel 300 ... Conventional angle 301 ... Invention angle 400 ... Conventional hat steel 401 ... Invention hat steel S1 to S6 ... Gap a1 to a3, b1 to b3 Each surface c1 to c4 ... corner (right angle bend)
Lp: Two-dimensional projection length Lp: Two-dimensional projection length

Claims (5)

  1. 長尺の金属素材を冷間フォーミング成形することにより、少なくとも1つの直角曲げ部を有する所定断面形状の予成形部材とする予成形工程と、
    冷間または温間で前記予成形部材の角部とともに該角部両側近傍の外辺部を外側に膨出させ、膨出部を有する一次成形部材を形成する第1の圧延工程と、
    冷間または温間で前記膨出部を角部の内側に向けて押し込み、外角部の二次元投影長さをLp、辺の厚さをt、角部の内角頂部から外角頂部までの頂部厚さをTとしたときに、0.5mm≦Lp≦0.3t、およびt<Tの関係を同時に満たす外角部を有する二次成形部材を形成する第2の圧延工程と、
    を有することを特徴とする金属材料の加工方法。 A method for processing a metal material, which comprises. A preforming step to form a preformed member having a predetermined cross-sectional shape having at least one right angle bend by cold-forming a long metal material; A preforming step to form a preformed member having a predetermined cross-sectional shape having at least one right angle bend by cold-forming a long metal material;
    A first rolling step of forming a primary molded member having a bulging portion by bulging the outer side portion in the vicinity of both sides of the corner portion together with the corner portion of the preformed member cold or warm; A first rolling step of forming a primary molded member having a bulging portion by bulging the outer side portion in the vicinity of both sides of the corner portion together with the corner portion of the preformed member cold or warm;
    Push the bulging part cold or warm toward the inside of the corner, the two-dimensional projection length of the outer corner is Lp, the thickness of the side is t, the apex thickness from the inner corner apex of the corner to the outer apex A second rolling step for forming a secondary molded member having an outer corner that simultaneously satisfies the relationship of 0.5 mm ≦ Lp ≦ 0.3t and t <T, where T is T , Push the bulging part cold or warm toward the inside of the corner, the two-dimensional projection length of the outer corner is Lp, the thickness of the side is t, the apex thickness from the inner corner apex of the corner to the outer apex A second rolling step for forming a secondary formed member having an outer corner that simultaneously satisfies the relationship of 0.5 mm ≤ Lp ≤ 0.3t and t <T, where T is T ,
    A method for processing a metal material, comprising: A method for processing a metal material, comprising:
  2. 前記第1の圧延工程では、外側に膨出させる前記外辺部の長さは前記角部の両側にそれぞれの辺長さの1/2以下とすることを特徴とする請求項1記載の方法In the first rolling process of claim 1 wherein the length of the perimeter to bulge outward, characterized by less than half of the respective side length on each side of the corner portion .
  3. 前記第1の圧延工程では、前記予成形部材の内角部に当接する縦ロールのロールエッジの曲率半径Reを前記予成形部材の内角部の曲率半径Riよりも小さくすることを特徴とする請求項1または2のいずれか1記載の方法In the first rolling step, claims, characterized in that the smaller than the radius of curvature Ri of the inner angle portion of the preformed member curvature radius Re of the roll edge of the vertical roll in contact with the interior angle portion of the preformed member 3. The method according to either 1 or 2 .
  4. さらに、前記第2の圧延工程の後に、前記二次成形部材の断面形状が所望の形状となるように矯正する第3の圧延工程を有することを特徴とする請求項1乃至3のうちいずれか1記載の方法Furthermore, after the said 2nd rolling process, it has the 3rd rolling process which correct | amends so that the cross-sectional shape of the said secondary shaping | molding member may become a desired shape, Any one of the Claims 1 thru | or 3 characterized by the above-mentioned. The method according to 1 .
  5. 請求項1乃至4のうちいずれか1の方法を用いて成形され、外角部の二次元投影長さLpが0.5mm以上で、辺の厚さtの0.3倍以下であることを特徴とする金属加工品。 It is shape | molded using the method of any one of Claims 1 thru | or 4, The two-dimensional projection length Lp of an outer corner part is 0.5 mm or more, and is 0.3 times or less of the side thickness t. Metal processed products.
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SE0501650L (en) * 2005-07-11 2006-05-23 Ortic 3D Ab Method to roll form a hat profile and roll forming machine
JP5158681B2 (en) * 2007-09-19 2013-03-06 日新製鋼株式会社 Roll forming method for channel cross-section material
KR101046169B1 (en) * 2008-12-30 2011-07-04 주식회사 성우하이텍 End Forming Units for Roll Forming Devices
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KR101350716B1 (en) 2011-11-29 2014-01-14 주식회사 성우하이텍 Roll forming method and formed beam produced by using the same
JP5865118B2 (en) * 2012-02-24 2016-02-17 吉川 寛 Drawing shaping apparatus and pultrusion processing machine using the apparatus
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JP6312366B2 (en) * 2013-03-26 2018-04-18 大和ハウス工業株式会社 Underfloor beam material and underfloor beam support structure
CN105880280A (en) * 2016-06-08 2016-08-24 张家港市天力达机电有限公司 Cold rolling technology used for machining special-shaped steel
CN108856300A (en) * 2017-05-15 2018-11-23 北新集团建材股份有限公司 A kind of wall body keel molding roller
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