JPH0938721A - Production of square steel tube - Google Patents
Production of square steel tubeInfo
- Publication number
- JPH0938721A JPH0938721A JP7192343A JP19234395A JPH0938721A JP H0938721 A JPH0938721 A JP H0938721A JP 7192343 A JP7192343 A JP 7192343A JP 19234395 A JP19234395 A JP 19234395A JP H0938721 A JPH0938721 A JP H0938721A
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- polygonal hollow
- square steel
- steel tube
- forming
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、たとえば建築用の
柱材に使用される正方体形状や直方体形状などの大径の
角形鋼管を製造する際に使用される角形鋼管の製造方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a rectangular steel pipe used for manufacturing a rectangular steel pipe having a large diameter such as a rectangular parallelepiped or a rectangular parallelepiped used for a pillar material for construction. .
【０００２】[0002]
【従来の技術】従来、建築用の柱材などに使用される大
径の角形鋼管は、たとえば特公昭58−13245 号公報に見
られる製造方法で得られていた。すなわち、この従来方
法は、一枚の厚肉鋼板を長さ方向に移送して両側の開先
加工を行ったのち、プレスにて、角形鋼管の四隅に相当
する部分を曲げ加工して角形鋼管近似の形状に成形し、
次いで近似角形鋼管を複数段の成形ロールに通して角形
鋼管形状に成形しつつ、開先突き合わせ面を順次仮付け
溶接し、そして開先部材内外面を自動溶接によって溶接
したのち、歪み取りを行うことで、大径の角形鋼管を得
ている。2. Description of the Related Art Conventionally, large-diameter square steel pipes used for building pillars and the like have been obtained by the manufacturing method disclosed in Japanese Patent Publication No. 58-13245. That is, in this conventional method, one thick steel plate is transferred in the length direction to perform groove forming on both sides, and then a press is used to bend the portions corresponding to the four corners of the square steel pipe to form a square steel pipe. Molded into an approximate shape,
Next, while passing the approximate square steel pipe through a plurality of stages of forming rolls to form a square steel pipe shape, the groove abutting surfaces are sequentially tack welded, and the inner and outer surfaces of the groove member are welded by automatic welding, and then strain relief is performed. Therefore, a large-diameter square steel pipe is obtained.
【０００３】しかし、上記した冷間成形により製造され
た角形鋼管は、角部およびシーム溶接部の硬さが平板部
（母材）に比べてかなり高い値となるため、角部および
シーム溶接部の降伏強さが増大し、延性の低下をきたす
ことになり、以て機械的性質が不均一で残留応力が発生
していることから、切削加工などを容易に行えない。However, in the square steel pipe manufactured by the cold forming described above, the hardness of the corner portion and the seam welded portion is considerably higher than that of the flat plate portion (base metal), so that the corner portion and the seam welded portion are hardened. The yield strength is increased, and the ductility is reduced. Since the mechanical properties are nonuniform and residual stress is generated, it is difficult to perform cutting work.
【０００４】そこで最近では、大径の角形鋼管に見合う
所定の径、板厚、長さの丸形鋼管を原管として、この原
管を加熱炉で加熱し、次いで加熱した原管を丸形鋼管成
形ミルで熱間成形して精製原管とし、そして精製原管を
角形鋼管成形ミルで熱間成形して角形鋼管を製造するこ
とが提供されている。Therefore, recently, a round steel pipe having a predetermined diameter, plate thickness and length commensurate with a large-diameter square steel pipe is used as a raw pipe, the raw pipe is heated in a heating furnace, and then the heated raw pipe is rounded. It is provided to hot-form a refined raw pipe in a steel pipe forming mill and hot-form the refined raw pipe in a square steel pipe forming mill to produce a square steel pipe.
【０００５】[0005]
【発明が解決しようとする課題】しかし、上記の丸形鋼
管を原管とする製造方法において、原管は、厚肉鋼板に
対して何度も繰り返してプレス成形しなければ得られ
ず、すなわち成形回数が多いことになって、その製作に
は時間と経費とがかかることになる。また、プレス成形
のみで製作した際には、そのシーム溶接を行う端部分が
外側に拡がった状態になる。これに対しては、端部分を
拡がり側とは反対側に予め曲げ加工すればよいが、この
場合、端曲げ加工機を設備しなければならず、また端曲
げ工程が必要になる。However, in the above manufacturing method using the round steel pipe as the raw pipe, the raw pipe cannot be obtained unless the thick steel plate is repeatedly press-formed, that is, As a result of the large number of moldings, its production is time-consuming and costly. In addition, when only the press molding is used, the seam-welded end portion is spread outward. For this, the end portion may be bent in advance on the side opposite to the expansion side, but in this case, an end bending machine must be installed and an end bending step is required.
【０００６】そこで本発明は、熱間成形方式でありなが
ら、プレス成形回数を少なくし得るとともに、端曲げ加
工機を不要にし得る角形鋼管の製造方法を提供すること
を目的としたものである。[0006] Therefore, an object of the present invention is to provide a method for manufacturing a rectangular steel pipe, which can reduce the number of times of press forming while using the hot forming method and can eliminate the need for an end bending machine.
【０００７】[0007]
【課題を解決するための手段】前述した目的を達成する
ために、本発明の請求項１記載の角形鋼管の製造方法
は、平板素材をプレス成形したのちシーム溶接を行って
形成した多角中空鋼管を、加熱炉にて加熱したのち、角
形鋼管成形機により角形鋼管に熱間成形することを特徴
としたものである。In order to achieve the above-mentioned object, a method for manufacturing a rectangular steel pipe according to claim 1 of the present invention is a polygonal hollow steel pipe formed by press-forming a flat plate material and then performing seam welding. Is heated in a heating furnace and then hot-formed into a rectangular steel pipe by a rectangular steel pipe forming machine.
【０００８】ここでは、主として大径の角形鋼管を製造
するが、これは中径や小径の角形鋼管も同様に製造し得
る。したがって請求項１の発明によると、プレス成形機
により平板素材の複数箇所をプレスすることで、多角中
空状鋼管を成形し得、そして開先どうしを当接させて溶
接を施工することで、シーム溶接部を有する多角中空鋼
管を製作し得る。この多角中空鋼管を、加熱炉において
高温加熱したのち角形鋼管成形機において熱間成形する
ことで、角形鋼管を製造し得る。Here, a large-diameter square steel pipe is mainly produced, but a medium-diameter or small-diameter square steel pipe can be produced in the same manner. Therefore, according to the invention of claim 1, a polygonal hollow steel pipe can be formed by pressing a flat plate material at a plurality of points by a press forming machine, and welding is performed by bringing the grooves into contact with each other to thereby form a seam. Polygonal hollow steel pipes with welds can be manufactured. The polygonal hollow steel pipe can be manufactured by heating the polygonal hollow steel pipe at a high temperature in a heating furnace and then hot forming it in a square steel pipe forming machine.
【０００９】[0009]
【発明の実施の形態】以下に本発明の実施の形態を図１
〜図３に基づいて説明する。たとえば大径の四角形鋼管
を製造するに当たり、この四角形鋼管に見合う所定の板
厚、長さ、幅の平板素材、すなわち鋼板１が、多数枚を
積み重ねた状態でストレージされる。これら鋼板１群の
うち、最上位の一枚の鋼板１が、たとえば磁石付きのク
レーンなどにより持ち上げられ、そしてコンベヤ10に渡
される。次いで鋼板１は、コンベヤ10によって開先加工
機11に搬入され、シーム溶接を行う一対の縁部に開先２
が形成される。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG.
~ It demonstrates based on FIG. For example, in manufacturing a large-diameter rectangular steel pipe, a flat plate material having a predetermined plate thickness, length, and width, that is, a steel plate 1 corresponding to the rectangular steel pipe is stored in a stacked state. Of the group of steel plates 1, the topmost steel plate 1 is lifted by, for example, a crane with a magnet, and passed to the conveyor 10. Next, the steel plate 1 is carried into the groove processing machine 11 by the conveyor 10, and the groove 2 is formed at the pair of edges for seam welding.
Is formed.
【００１０】なお、予め開先２の形成を行った鋼板１を
積み重ね状でストレージしておいてもよい。また鋼板１
は、コイル状に巻かれているものを巻き戻しながら切断
して得てもよい。The steel plates 1 on which the groove 2 has been formed in advance may be stacked and stored. Steel plate 1
May be obtained by cutting a coiled product while rewinding it.
【００１１】開先２を形成した鋼板１は、コンベヤ10に
よってプレス成形機12に搬入される。このプレス成形機
12において鋼板１は多角中空状鋼管３にプレス成形され
る。すなわち、たとえば七箇所をプレス成形すること
で、一対の開先２間が広めに開放された八角形状の多角
中空状鋼管３がプレス成形される。その際に多角中空状
鋼管３は、最終の四角形鋼管を得たとき、シーム溶接部
を常に平板部の中央付近に存在させる位置となるように
プレス成形される。The steel plate 1 on which the groove 2 is formed is carried into the press molding machine 12 by the conveyor 10. This press molding machine
At 12, the steel plate 1 is press-formed into a polygonal hollow steel pipe 3. That is, for example, the octagonal polygonal hollow steel pipe 3 having a wide opening between the pair of the grooves 2 is press-molded by press-molding seven places. At that time, the polygonal hollow steel pipe 3 is press-formed so that the seam welded portion is always located near the center of the flat plate portion when the final square steel pipe is obtained.
【００１２】この多角中空状鋼管３はコンベヤ10によっ
て仮付け溶接機13に搬入され、そして外圧を加えること
で開先２どうしを当接させたのち、仮付け溶接４が施工
される。そして多角中空状鋼管３はコンベヤ10によって
内面溶接機14に搬入され、内面溶接５が施工される。次
いで多角中空状鋼管３はコンベヤ10によって外面溶接機
15に搬入されて外面溶接６が施工され、以てシーム溶接
部７を有する正八角形状の多角中空鋼管８を製作し得
る。なお各溶接は、高周波溶接やアーク溶接などにより
施工される。The polygonal hollow steel pipe 3 is carried into the tack welding machine 13 by the conveyor 10, and the groove 2 is brought into contact with each other by applying an external pressure, and then the tack welding 4 is performed. Then, the polygonal hollow steel pipe 3 is carried into the inner surface welding machine 14 by the conveyor 10 and the inner surface welding 5 is performed. Next, the polygonal hollow steel pipe 3 is welded to the outer surface of the welder by the conveyor 10.
The outer surface welding 6 is carried in to 15 and the regular octagonal polygonal hollow steel pipe 8 which has the seam welding part 7 can be manufactured by it. Each welding is performed by high frequency welding, arc welding, or the like.
【００１３】このようにして製作された多角中空鋼管８
は、コンベヤ10から搬入床16上に搬入される。ここで搬
入床16はコンベヤ形式であって、複数本の多角中空鋼管
３を平行させて支持し、そして長さ方向に対して横方向
へと搬送させる。搬入床16の終端部に搬送された多角中
空鋼管８は、加熱炉17に搬入され、この加熱炉17におい
て長さ方向に搬送されて、その搬送中に、Ａ3 変態点以
上に高温加熱Ａされる。所定の温度に加熱された多角中
空鋼管８は、加熱炉17から搬出され、そして角形鋼管成
形機（角形鋼管成形ミル）18に搬入される。Polygonal hollow steel pipe 8 manufactured in this way
Are loaded onto the loading floor 16 from the conveyor 10. Here, the loading floor 16 is a conveyor type, and supports a plurality of polygonal hollow steel pipes 3 in parallel, and transports them in a direction transverse to the length direction. Polygonal hollow steel tube 8 which has been conveyed to the terminal end of the loading floor 16 is conveyed into the heating furnace 17, is conveyed in the longitudinal direction in the heating furnace 17, while the conveyor, a high temperature heating above A 3 transformation point A To be done. The polygonal hollow steel pipe 8 heated to a predetermined temperature is unloaded from the heating furnace 17 and then loaded into a rectangular steel pipe forming machine (square steel pipe forming mill) 18.
【００１４】この角形鋼管成形機18では、複数のつづみ
形ロール19などを介して最終の熱間成形（成形温度、Ａ
3 変態点以上）を行うもので、多角中空鋼管８の各角部
分が平面に成形されるとともに、平板部分が新たに角部
分に成形され、以て大径の四角形鋼管（角形鋼管）９が
熱間成形される。In this rectangular steel pipe forming machine 18, the final hot forming (forming temperature, A
(3 transformation points or more), each corner portion of the polygonal hollow steel pipe 8 is formed into a flat surface, and the flat plate portion is newly formed into a corner portion, so that a large-diameter square steel pipe (square steel pipe) 9 is formed. Hot formed.
【００１５】その際に熱間成形直後の四角形鋼管（角形
鋼管）９は、各平板部９Ａがつづみ面に沿った外方への
円弧面に成形されているが、その後に四角形鋼管９は、
各平板部９Ａが収縮されて円弧面が直状面となり、また
角部のＲはシャープとなって、断面係数が高くなる。な
お多角中空鋼管８が正八角形状であることから、コンベ
ヤ10による搬送は一つの平板部分を利用して常に一定の
向きで行え、以て角形鋼管成形機18での熱間成形は、常
にシーム溶接部７の位置を一定の方向に揃えて、すなわ
ちシーム溶接部７を常に平板部９Ａの中央付近に存在さ
せる位置として行える。At this time, in the square steel pipe (square steel pipe) 9 immediately after hot forming, each flat plate portion 9A is formed in an outward arc surface along the joining surface. ,
Each flat plate portion 9A is contracted so that the arcuate surface becomes a straight surface, and the R of the corner portion becomes sharp, so that the section modulus becomes high. Since the polygonal hollow steel pipe 8 has a regular octagonal shape, the conveyor 10 can always carry it in a fixed direction by using one flat plate portion, so that the hot forming by the rectangular steel pipe forming machine 18 is always performed by the seam. The position of the welded portion 7 can be aligned in a certain direction, that is, the seam welded portion 7 can be always located near the center of the flat plate portion 9A.
【００１６】なお角形鋼管成形機18の周辺で、必要する
箇所（角形鋼管成形機18の前後、前のみ、後ろのみ、ス
タンド間など）には、必要とする数のデスケーラー装置
20が設けられている。このデスケーラー装置20は、多角
中空鋼管８や四角形鋼管９などに対して水圧をかけた水
を噴射するもので、この水噴射によりミルスケールなど
を除去し、表面肌を良くし得る。Around the square steel pipe forming machine 18, a required number of descaler devices are provided at necessary places (front and rear of the square steel pipe forming machine 18, only in front, only behind, between stands, etc.).
20 are provided. The descaler device 20 is for injecting water with water pressure applied to the polygonal hollow steel pipe 8, the square steel pipe 9 and the like, and this water injection can remove mill scale and the like to improve the surface texture.
【００１７】次いで熱間成形された四角形鋼管９は冷却
床21に受け取られる。この冷却床21はコンベヤ形式であ
って、複数本の四角形鋼管９を平行させて支持し、そし
て長さ方向に対して横方向へと搬送させる。この冷却床
21での搬送中に、四角形鋼管９は空冷形式で放熱Ｂ、す
なわち徐冷される。The hot formed square steel tube 9 is then received by the cooling floor 21. The cooling floor 21 is of a conveyor type, and supports a plurality of square steel pipes 9 in parallel, and transports them in a direction transverse to the length direction. This cooling floor
During transportation at 21, the square steel pipe 9 is radiated B, that is, gradually cooled in an air-cooled manner.
【００１８】冷却床21での四角形鋼管９群の搬送は、隣
接した四角形鋼管９の間を離した状態で、または隣接し
た四角形鋼管９どうしを接触させ両側よりクランプした
状態で行われる。これにより四角形鋼管９は、同じ雰囲
気温度下で徐冷されることになり、以て冷却時の曲がり
を少なくし得る。冷却床21の終端に達した四角形鋼管９
は、図示していない先端切断装置、後端切断装置、洗浄
装置、防錆装置へと搬送され、それぞれで処理されたの
ち、製品としてストレージされる。The group of square steel pipes 9 is transported on the cooling floor 21 in a state where adjacent square steel pipes 9 are separated from each other or in a state where adjacent square steel pipes 9 are in contact with each other and clamped from both sides. As a result, the square steel pipe 9 is gradually cooled under the same atmospheric temperature, and thus bending during cooling can be reduced. Square steel pipe 9 reaching the end of cooling floor 21
Is transported to a leading end cutting device, a trailing end cutting device, a cleaning device, and a rust preventive device (not shown), processed by each of them, and then stored as a product.
【００１９】次に、本発明の別な実施の形態を、図４、
図５に基づいて説明する。すなわちプレス成形機12によ
る多角中空状鋼管３のプレス成形は、シーム溶接部７
が、多角中空状鋼管３の一つの隅部に位置されるように
行われる。したがって最終の四角形鋼管９を得たとき、
シーム溶接部７を常に平板部９Ａの中央付近に存在させ
る位置となるように、角形鋼管成形機18に搬入される前
の多角中空鋼管８は、たとえば溶接シーム位置調整装置
（図示せず。）などによって向きの調整、規制が行われ
る。Next, another embodiment of the present invention will be described with reference to FIG.
A description will be given based on FIG. That is, the press forming of the polygonal hollow steel pipe 3 by the press forming machine 12 is performed by the seam weld 7
Are positioned at one corner of the polygonal hollow steel pipe 3. Therefore, when the final square steel pipe 9 is obtained,
The polygonal hollow steel pipe 8 before being loaded into the rectangular steel pipe forming machine 18 is, for example, a weld seam position adjusting device (not shown) so that the seam welded portion 7 is always located near the center of the flat plate portion 9A. The orientation is adjusted and regulated according to such factors.
【００２０】図６は、本発明のさらに別な実施の形態を
示す。すなわち、シーム溶接部７を有する正八角形状の
多角中空鋼管８を製作したのち、この多角中空鋼管８は
丸管成形機に通されて丸管25に冷間成形される。そして
丸管25は加熱炉17に搬入され、高温加熱Ａされたのち、
角形鋼管成形機18に搬入されて四角形鋼管９に成形され
る。この、さらに別な実施の形態によると、多角中空鋼
管８から丸管25への冷間成形は容易に行え、さらに丸管
25から四角形鋼管９への熱間成形も容易に精度よく行え
る。なお多角中空鋼管８は、加熱炉17に搬入されて高温
加熱Ａされたのち、丸管成形機に通されて丸管25に熱間
成形されてもよい。FIG. 6 shows another embodiment of the present invention. That is, after forming a regular octagonal polygonal hollow steel pipe 8 having a seam welded portion 7, the polygonal hollow steel pipe 8 is passed through a round pipe forming machine and cold-formed into a round pipe 25. Then, the round tube 25 is carried into the heating furnace 17, heated at high temperature A, and then
It is loaded into the rectangular steel pipe forming machine 18 and formed into a rectangular steel pipe 9. According to this further embodiment, cold forming from the polygonal hollow steel pipe 8 to the round pipe 25 can be easily performed, and
Hot forming from 25 to the square steel pipe 9 can be easily and accurately performed. The polygonal hollow steel tube 8 may be carried into the heating furnace 17 and subjected to high temperature heating A, and then passed through a round tube forming machine to be hot formed into the round tube 25.
【００２１】上記した各実施の形態では、大径の四角形
鋼管９を製造しているが、これは中径や小径の四角形鋼
管９も同様に製造し得るものである。また上記した各実
施の形態では断面で正四角形の四角形鋼管９を製造して
いるが、これは長方形の四角形鋼管９も同様に製造し得
るものである。さらに角形鋼管成形機18のローラ配置を
変更するなどして、五角形鋼管や六角形鋼管など多角形
鋼管の熱間成形を行えるものである。In each of the above-described embodiments, the large-diameter square steel pipe 9 is manufactured, but the medium-diameter or small-diameter square steel pipe 9 can be manufactured in the same manner. Further, in each of the above-described embodiments, a square steel pipe 9 having a square cross section is manufactured, but a rectangular steel pipe 9 having a rectangular cross section can be manufactured in the same manner. Further, by changing the roller arrangement of the square steel pipe forming machine 18, it is possible to perform hot forming of a polygonal steel pipe such as a pentagonal steel pipe or a hexagonal steel pipe.
【００２２】上記した各実施の形態では、七箇所をプレ
ス成形することで八角形状の多角中空状鋼管３をプレス
成形しているが、これはプレス箇所の数を変化させるこ
とで、多角中空状鋼管３、すなわち多角中空鋼管８の角
形状は、六角形状、十角形状など任意に調整し得ること
になる。In each of the above-described embodiments, the octagonal polygonal hollow steel pipe 3 is press-formed by press-forming seven points, but this is performed by changing the number of press points. The square shape of the steel pipe 3, that is, the polygonal hollow steel pipe 8 can be arbitrarily adjusted such as a hexagonal shape or a decagonal shape.
【００２３】なお、プレス箇所の数を多くすればするほ
ど、曲げ角度を鈍角として多角中空状鋼管３を円状に近
付け得、角形鋼管の成形をより好適に行える。その際
に、プレス箇所の数を多くなったとしても、従来の丸管
成形のプレス回数に比べれば、はるかに少ないものにな
る。As the number of pressed parts is increased, the polygonal hollow steel pipe 3 can be approximated to a circular shape by setting the bending angle to an obtuse angle, so that the rectangular steel pipe can be more preferably formed. At that time, even if the number of press parts is increased, the number of presses is far smaller than the number of presses in the conventional round tube molding.
【００２４】上記した各実施の形態では、一箇所が開放
された八角形状の多角中空状鋼管３に対して溶接施工す
ることで多角中空鋼管８を成形しているが、これは一対
の段面皿状部材（複数の分割成形部材）を合わせ、二箇
所（複数箇所）にシーム溶接部７が存在するように溶接
施工することで多角中空鋼管８を成形してもよい。In each of the above-mentioned embodiments, the polygonal hollow steel pipe 8 is formed by welding the octagonal polygonal hollow steel pipe 3 having one open portion, but this is a pair of step surfaces. The polygonal hollow steel pipe 8 may be molded by combining the dish-shaped members (plurality of divided molding members) and performing welding so that the seam welds 7 are present at two locations (plurality of locations).
【００２５】[0025]
【発明の効果】上記した本発明の請求項１によると、プ
レス成形機により平板素材の複数箇所をプレスすること
で多角中空状鋼管を成形でき、そして開先どうしを当接
させて溶接を施工することでシーム溶接部を有する多角
中空鋼管を製作でき、この多角中空鋼管を、加熱炉にお
いて高温加熱したのち角形鋼管成形機において熱間成形
することで、角形鋼管を製造することができる。According to claim 1 of the present invention described above, a polygonal hollow steel pipe can be formed by pressing a flat plate material at a plurality of points by a press forming machine, and welding is performed by bringing the grooves into contact with each other. By doing so, a polygonal hollow steel pipe having a seam welded portion can be produced, and the polygonal hollow steel pipe is heated at a high temperature in a heating furnace and then hot-formed in a square steel pipe forming machine to produce a square steel pipe.
【００２６】したがって、プレス成形機による成形回数
（プレス回数）は多角中空状鋼管を得るだけの少ないも
のにでき、その成形は迅速（短時間）にかつ安い経費で
行うことができる。また端曲げ加工機を不要にできて、
設備費を安くできるとともに、端曲げ工程が不要になっ
てライン構成を簡素化でき、省力化できる。Therefore, the number of moldings (the number of pressings) by the press molding machine can be made as small as the polygonal hollow steel pipe can be obtained, and the molding can be carried out quickly (in a short time) and at a low cost. Moreover, the end bending machine can be eliminated,
The equipment cost can be reduced, the end bending process is not required, the line configuration can be simplified, and labor can be saved.
【図１】本発明の実施の形態を示し、角形鋼管の製造方
法における工程斜視図である。FIG. 1 shows an embodiment of the present invention and is a process perspective view in a method for manufacturing a rectangular steel pipe.
【図２】同角形鋼管の製造方法における工程説明図であ
る。FIG. 2 is a process explanatory view in the method for manufacturing the equiangular steel pipe.
【図３】同角形鋼管の製造方法における溶接説明図であ
る。FIG. 3 is an explanatory view of welding in the manufacturing method of the equiangular steel pipe.
【図４】本発明の別の実施の形態を示し、角形鋼管の製
造方法における工程説明図である。FIG. 4 shows another embodiment of the present invention and is a process explanatory view in the method for manufacturing a rectangular steel pipe.
【図５】同角形鋼管の製造方法における溶接説明図であ
る。FIG. 5 is an explanatory view of welding in the method for manufacturing the equiangular steel pipe.
【図６】本発明のさらに別の実施の形態を示し、角形鋼
管の製造方法における工程説明図である。FIG. 6 shows still another embodiment of the present invention, and is a process explanatory view in the method for manufacturing a rectangular steel pipe.
１ 鋼板（平板素材） ３ 多角中空状鋼管 ７ シーム溶接部 ８ 多角中空鋼管 ９ 四角形鋼管（角形鋼管） ９Ａ 平板部 12 プレス成形機 13 仮付け溶接機 14 内面溶接機 15 外面溶接機 17 加熱炉 18 角形鋼管成形機 19 つづみ形ローラ 21 冷却床 25 丸管 Ａ 高温加熱 Ｂ 放熱 1 Steel plate (flat plate material) 3 Polygonal hollow steel pipe 7 Seam welded part 8 Polygonal hollow steel pipe 9 Square steel pipe (square steel pipe) 9A Flat plate part 12 Press forming machine 13 Temporary welding machine 14 Internal welding machine 15 External welding machine 17 Heating furnace 18 Square steel pipe forming machine 19 Claw-shaped roller 21 Cooling floor 25 Round tube A High temperature heating B Heat dissipation
Claims (1)
接を行って形成した多角中空鋼管を、加熱炉にて加熱し
たのち、角形鋼管成形機により角形鋼管に熱間成形する
ことを特徴とする角形鋼管の製造方法。1. A polygonal hollow steel pipe formed by press-forming a flat plate material and then performing seam welding, heating the polygonal hollow steel pipe in a heating furnace, and then hot forming the polygonal hollow steel pipe by a square steel pipe forming machine. Steel pipe manufacturing method.
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7192343A JPH0938721A (en) | 1995-07-28 | 1995-07-28 | Production of square steel tube |
| TW085102754A TW302309B (en) | 1995-04-25 | 1996-03-06 | The manufacturing method for square and round steel pipe |
| KR1019960007390A KR100213424B1 (en) | 1995-04-25 | 1996-03-19 | Manufacturing method of square or rectangular-shaped steel pipes and manufacturing method of round-shaped steel pipes |
| CNB001270524A CN1177656C (en) | 1995-07-28 | 1996-07-26 | Manufacturing method of square steel tube and round steet tube |
| CN96113345A CN1066075C (en) | 1995-07-28 | 1996-07-26 | Mfg. method for square steel pipe and mfg. method for circular steel pipe |
| MYPI0105380 MY126145A (en) | 1995-07-28 | 1996-07-27 | Manufacturing method for angled steel pipes and manufacturing method for round steel pipes |
| MYPI20015370A MY124926A (en) | 1995-07-28 | 1996-07-27 | Manufacturing method for angled steel pipes and manufacturing method for round steel pipes |
| CN 00127053 CN1186141C (en) | 1995-07-28 | 2000-09-15 | Manufacturing method of square steel tube and round steel tube |
| HK01107036A HK1036027A1 (en) | 1995-07-28 | 2001-10-08 | Manufacturing method for angled steel pipes. |
| HK01107038A HK1036028A1 (en) | 1995-07-28 | 2001-10-08 | Manufacturing method for angled steel pipes. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7192343A JPH0938721A (en) | 1995-07-28 | 1995-07-28 | Production of square steel tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0938721A true JPH0938721A (en) | 1997-02-10 |
Family
ID=16289703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7192343A Pending JPH0938721A (en) | 1995-04-25 | 1995-07-28 | Production of square steel tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0938721A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104107845A (en) * | 2013-04-19 | 2014-10-22 | 上海金保莱不锈钢有限公司 | Production technology of stainless steel pipe |
| CN105537791A (en) * | 2016-01-21 | 2016-05-04 | 中信重工机械股份有限公司 | Method for ensuring coaxiality of barrel bodies of large-size horizontal type converter during field welding |
| CN105562456A (en) * | 2015-12-03 | 2016-05-11 | 中铝洛阳铜业有限公司 | Preparation process of red copper square pipe material |
| JP2019523709A (en) * | 2016-05-31 | 2019-08-29 | ヴァローレック ドイチュラント ゲーエムベーハー | Process for producing stretched hollow bodies made of steel and having a polygonal, in particular quadrangular or rectangular cross section |
| CN110653267A (en) * | 2018-06-29 | 2020-01-07 | 宝山钢铁股份有限公司 | Control method for micro-opening welding seam of hot galvanizing unit leveling equipment |
| CN115532899A (en) * | 2022-11-24 | 2022-12-30 | 江苏华裕交通集团有限公司 | Bending machine for signal rod production |
-
1995
- 1995-07-28 JP JP7192343A patent/JPH0938721A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104107845A (en) * | 2013-04-19 | 2014-10-22 | 上海金保莱不锈钢有限公司 | Production technology of stainless steel pipe |
| CN105562456A (en) * | 2015-12-03 | 2016-05-11 | 中铝洛阳铜业有限公司 | Preparation process of red copper square pipe material |
| CN105562456B (en) * | 2015-12-03 | 2018-01-09 | 中铝洛阳铜业有限公司 | A kind of red copper square tube material preparation process |
| CN105537791A (en) * | 2016-01-21 | 2016-05-04 | 中信重工机械股份有限公司 | Method for ensuring coaxiality of barrel bodies of large-size horizontal type converter during field welding |
| JP2019523709A (en) * | 2016-05-31 | 2019-08-29 | ヴァローレック ドイチュラント ゲーエムベーハー | Process for producing stretched hollow bodies made of steel and having a polygonal, in particular quadrangular or rectangular cross section |
| CN110653267A (en) * | 2018-06-29 | 2020-01-07 | 宝山钢铁股份有限公司 | Control method for micro-opening welding seam of hot galvanizing unit leveling equipment |
| CN110653267B (en) * | 2018-06-29 | 2021-06-15 | 宝山钢铁股份有限公司 | Control method for micro-opening welding seam of hot galvanizing unit leveling equipment |
| CN115532899A (en) * | 2022-11-24 | 2022-12-30 | 江苏华裕交通集团有限公司 | Bending machine for signal rod production |
| CN115532899B (en) * | 2022-11-24 | 2023-03-10 | 江苏华裕交通集团有限公司 | Bending machine for signal rod production |
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