JPH0195814A - Manufacture of forge-welded steel pipe - Google Patents
Manufacture of forge-welded steel pipeInfo
- Publication number
- JPH0195814A JPH0195814A JP62252484A JP25248487A JPH0195814A JP H0195814 A JPH0195814 A JP H0195814A JP 62252484 A JP62252484 A JP 62252484A JP 25248487 A JP25248487 A JP 25248487A JP H0195814 A JPH0195814 A JP H0195814A
- Authority
- JP
- Japan
- Prior art keywords
- forge
- pipe
- bonding surfaces
- welded steel
- open pipe
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 34
- 239000010959 steel Substances 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 238000003466 welding Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 239000011261 inert gas Substances 0.000 claims abstract description 8
- 238000007664 blowing Methods 0.000 claims abstract 2
- 238000005242 forging Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 230000006698 induction Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- 230000001678 irradiating effect Effects 0.000 abstract 1
- 238000005507 spraying Methods 0.000 abstract 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000010953 base metal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
Landscapes
- Laser Beam Processing (AREA)
Abstract
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は鍛接鋼管の製造方法に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a method for manufacturing a forge-welded steel pipe.
［従来の技術］
鍛接鋼管の製造方法は一般に、狭巾帯鋼をガス燃焼式等
の加熱炉で１２００〜１２５０℃程度に予熱し、つづい
て誘導加熱装置で側端部のみを更に昇熱しフォーミング
ロールにより側端面同士を対向させるべく成形ロールで
成形してオープンパイプとなし、狭巾帯鋼の側端面即ち
鍛着面に高圧空気を吹きつけその鍛着面の酸化物を除去
し、つづいて鍛接ロールへ送給して側圧を加えることに
より鍛着させている。[Prior Art] The general method for manufacturing forge-welded steel pipes is to preheat narrow band steel to about 1,200 to 1,250°C in a gas-fired heating furnace, and then further heat only the side ends using an induction heating device for forming. It is formed into an open pipe using a forming roll so that the side end surfaces face each other, and high pressure air is blown onto the side end surfaces of the narrow band steel, that is, the forged surface to remove oxides from the forged surface. It is forged by feeding it to a forge welding roll and applying lateral pressure.
［発明が解決しようとする問題点］
しかしながら上述した従来の鍛接鋼管の製造方法では、
鍛着面の酸化物を完全に取除くことは不可能であり、一
部の酸化物が鍛着部に包みこまれて鍛着される。この酸
化物を主体とした非金属介在物の群落は鍛接鋼管の材質
の均一性を損ねるので、このような鍛接鋼管は高圧力配
管用鋼管もしくは油井用鋼管等の高級鋼管に適用するこ
とが出来なかった。[Problems to be solved by the invention] However, in the conventional forge-welded steel pipe manufacturing method described above,
It is impossible to completely remove the oxide on the forged surface, and some of the oxide is wrapped in the forged part and forged. This cluster of non-metallic inclusions mainly composed of oxides impairs the uniformity of the material of forge-welded steel pipes, so such forge-welded steel pipes cannot be applied to high-grade steel pipes such as steel pipes for high-pressure piping or steel pipes for oil wells. There wasn't.
本発明はかする事情に鑑みなされたもので、鍛着部に非
金属介在物の群落等の欠陥をもたない鍛接鋼管を製造す
る方法を提供することを目的とする。The present invention was made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing a forge-welded steel pipe that does not have defects such as clusters of non-metallic inclusions in the forged portion.
［問題点を解決するための手段］
本発明は鋼帯の両側端部を加熱し、フォーミングロール
をとおして、オープンパイプとしてから、鍛接ロールで
鍛着して鍛接鋼管を製造する方法において、前記オープ
ンパイプを鍛接ロールへ送給するに先立ち、そのオープ
ンパイプの対向する鍛着面に、不活性ガスを吹き付け、
無酸化雰囲気を形成しながらレーザービームを照射し、
鍛着面の酸化物を蒸発させて除去し続いて鍛接ロールで
鍛着する鍛接鋼管の製造方法である。[Means for Solving the Problems] The present invention provides a method for manufacturing a forge-welded steel pipe by heating both ends of a steel strip, passing it through a forming roll to form an open pipe, and then forging it with a forge-welding roll. Before feeding the open pipe to the forge welding rolls, inert gas is blown onto the opposing forge surfaces of the open pipe.
Irradiate the laser beam while creating a non-oxidizing atmosphere,
This is a method for manufacturing forge-welded steel pipes in which oxides on the forged surface are evaporated and removed, and then forged with forge-welding rolls.
［作用］
本発明による鍛接鋼管の製造方法では、オープンパイプ
を鍛接ロールへ送給するに先立ち、無酸化雰囲気で鍛着
面の酸化物にレーザービームを照射して、その酸化物を
蒸発させて除去し、続いて鍛接ロールで鍛着する。[Function] In the method for manufacturing a forge-welded steel pipe according to the present invention, before the open pipe is fed to the forge-welding roll, the oxide on the forge surface is irradiated with a laser beam in a non-oxidizing atmosphere to evaporate the oxide. removed and then forged with a forge welding roll.
以下に添付図面を参照して本発明の一実施例を詳細に説
明する。An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
第１図に本発明に用いられる鍛接鋼管の製造設備を示す
。狭巾帯鋼１は加熱炉２内にてガス燃焼加熱により予熱
され、次に誘導加熱装置３によって両側端部が加熱され
る。つづいて狭巾帯鋼１はフォーミングロール４によっ
て管状に成形されオープンパイプ５となる。オープンパ
イプ５の下側に両鍛着面８が相対向している。ついで不
活性ガス吹付はノズルを兼ねたレーザー照射ヘッド６の
上を鍛着面８が通過しこの際両鍛着面８上の酸化膜が蒸
発し除去される。つづいて鍛接ロール７に送給され両鍛
着面８は互いに圧し合って鍛着し鍛接鋼管９となる。第
２図はオープンパイプ５、鍛着面８、鍛接ロール７、及
び鍛接鋼管９の関係位置を仰ぎ見た斜視図である。レー
ザービーム１０と鍛着面８とレーザー照射ヘッド６との
相互の関係位置を第３図に示す。本実施例においてはレ
ーザー光源１１よりレーザーは反射鏡１２によって鍛着
面８へ導かれる。炭酸ガスレーザーを使用するが、大容
量で連続に発生するレーザーであれば炭酸ガスレーザー
以外のレーザーを使用してもさしつかえはない。不活性
ガス１３はレーザー光源１１と反射鏡１２との間から送
入され、鍛接Ｖ点１４近傍において鍛接面８に吹きつけ
られ、鍛接面８が空気により酸化されることを予防する
。FIG. 1 shows manufacturing equipment for forge-welded steel pipes used in the present invention. The narrow band steel 1 is preheated in a heating furnace 2 by gas combustion heating, and then both end portions are heated by an induction heating device 3. Next, the narrow band steel 1 is formed into a tubular shape by forming rolls 4 to become an open pipe 5. Both forged surfaces 8 are opposed to each other on the lower side of the open pipe 5. Then, the inert gas is sprayed so that the forging surface 8 passes over the laser irradiation head 6 which also serves as a nozzle, and at this time, the oxide films on both the forging surfaces 8 are evaporated and removed. Subsequently, it is fed to a forge welding roll 7, and both forge surfaces 8 are pressed against each other and forged to form a forge welded steel pipe 9. FIG. 2 is a perspective view looking up at the relative positions of the open pipe 5, forge surface 8, forge weld roll 7, and forge weld steel pipe 9. FIG. 3 shows the relative positions of the laser beam 10, the forging surface 8, and the laser irradiation head 6. In this embodiment, a laser beam from a laser light source 11 is guided to the forging surface 8 by a reflecting mirror 12. A carbon dioxide gas laser is used, but any laser other than the carbon dioxide laser may be used as long as it generates a large volume and continuously. The inert gas 13 is introduced between the laser light source 11 and the reflecting mirror 12 and is blown onto the forge weld surface 8 near the forge weld V point 14 to prevent the forge weld surface 8 from being oxidized by air.
レーザーの照射位置の調整は上下伸縮昇降装置１５及び
左右伸縮移動装置１６によって行われる。上下伸縮昇降
装置１５及び左右伸縮移動装置６はトルクモーター１７
によって駆動される。Adjustment of the laser irradiation position is performed by a vertically telescoping lifting device 15 and a horizontally telescoping moving device 16. The vertical telescopic lifting device 15 and the horizontal telescopic moving device 6 are driven by a torque motor 17.
driven by.
レーザーの照射位置が適正であるか否かを光ファイバー
つきカメラをレーザー照射ヘッド６に載架し監視してい
る。A camera with an optical fiber is mounted on the laser irradiation head 6 to monitor whether the laser irradiation position is appropriate.
レーザービーム１０が鍛着面８を加熱し表面の酸化物の
膜を蒸発させ除去する。この面は不活性ガスの雰囲気中
で鍛着するので、鍛着部に酸化物の非金属介在物をまき
込むことはない。The laser beam 10 heats the forging surface 8 and evaporates and removes the oxide film on the surface. Since this surface is forged in an inert gas atmosphere, no oxide nonmetallic inclusions are introduced into the forged portion.
［発明の効果］
本発明によれば、鍛接鋼管の製造の工程において鍛着面
の酸化物が除去され、鍛着部の材質が母材金属と変わら
なく出来るので、高圧力配管用鋼管若しくは油井用鋼管
等高級鋼管に適する鍛接鋼管を製造することが出来る。[Effects of the Invention] According to the present invention, oxides on the forged surface are removed during the manufacturing process of forge-welded steel pipes, and the material of the forged part is made the same as the base metal. It is possible to manufacture forge-welded steel pipes suitable for high-grade steel pipes such as industrial steel pipes.
第１図は本発明に用いられる鍛接鋼管の製造設備を示す
図、第２図は本発明におけるオープンパイプと鍛接ロー
ルとの関係位置を示す斜視図、第３図は本発明に用いら
れるレーザー照射装置と鍛接７点との関係位置及びレー
ザー照射装置の構造を示す図である。
１・・・狭巾帯鋼、２・・・加熱炉、３・・・誘導加熱
装置、４・・・７オーミングロール、５・・・オープン
パイプ、６・・・レーザー照射ヘッド、７・・・鍛接ロ
ール、８・・・鍛着面、９・・・鍛接鋼管、１０・・・
レーザービーム、１１・・・レーザー光源、１２・・・
反射鏡、１３・・・不活性ガス、１４・・・鍛接７点、
１５・・・上下伸縮昇降装置、１６・・・左右伸縮移動
装、１７・・・トルクモーター。
特許出願人 日本鋼管株式会社Fig. 1 is a diagram showing manufacturing equipment for forge-welded steel pipes used in the present invention, Fig. 2 is a perspective view showing the relative position of the open pipe and forge-welding rolls in the present invention, and Fig. 3 is a laser irradiation used in the present invention. It is a figure which shows the relative position of a device and seven forge welding points, and the structure of a laser irradiation device. DESCRIPTION OF SYMBOLS 1... Narrow band steel, 2... Heating furnace, 3... Induction heating device, 4... 7 Ohming roll, 5... Open pipe, 6... Laser irradiation head, 7... ... Forge-welded roll, 8... Forge-welded surface, 9... Forge-welded steel pipe, 10...
Laser beam, 11... Laser light source, 12...
Reflector, 13...Inert gas, 14...7 forge welding points,
15...Vertical telescopic lifting device, 16...Right and left telescopic moving device, 17... Torque motor. Patent applicant Nippon Kokan Co., Ltd.
Claims (1)
て、オープンパイプとしてから、鍛接ロールで鍛着して
鍛接鋼管を製造する方法において、前記オープンパイプ
を鍛接ロールへ送給するに先立ち、そのオープンパイプ
の対向する鍛着面に、不活性ガスを吹き付け、無酸化雰
囲気を形成しながらレーザービームを照射し、鍛着面の
酸化物を蒸発させて除去し続いて鍛接ロールで鍛着する
ことを特徴とする鍛接鋼管の製造方法。In a method of manufacturing a forge-welded steel pipe by heating both ends of a steel strip, passing it through a forming roll to form an open pipe, and then forging it with a forge-welding roll, the method includes: prior to feeding the open pipe to the forge-welding roll; The opposing forging surfaces of the open pipe are irradiated with a laser beam while forming an oxidation-free atmosphere by blowing inert gas to evaporate and remove oxides on the forging surfaces, followed by forging with a forge welding roll. A method for manufacturing a forge-welded steel pipe characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62252484A JPH0195814A (en) | 1987-10-08 | 1987-10-08 | Manufacture of forge-welded steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62252484A JPH0195814A (en) | 1987-10-08 | 1987-10-08 | Manufacture of forge-welded steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0195814A true JPH0195814A (en) | 1989-04-13 |
Family
ID=17238018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62252484A Pending JPH0195814A (en) | 1987-10-08 | 1987-10-08 | Manufacture of forge-welded steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0195814A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0699773A1 (en) * | 1994-08-05 | 1996-03-06 | Nkk Corporation | Method for manufacturing electric-resistance-welded steel pipe |
| US5837329A (en) * | 1994-12-28 | 1998-11-17 | Shinozaki Manufacturing Co., Ltd. | Method for machining rollers and other objects using laser light and equipment for machining |
| JP2015098032A (en) * | 2013-11-18 | 2015-05-28 | Ｊｆｅスチール株式会社 | Manufacturing method for butt-welded steel tube |
-
1987
- 1987-10-08 JP JP62252484A patent/JPH0195814A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0699773A1 (en) * | 1994-08-05 | 1996-03-06 | Nkk Corporation | Method for manufacturing electric-resistance-welded steel pipe |
| US5837329A (en) * | 1994-12-28 | 1998-11-17 | Shinozaki Manufacturing Co., Ltd. | Method for machining rollers and other objects using laser light and equipment for machining |
| JP2015098032A (en) * | 2013-11-18 | 2015-05-28 | Ｊｆｅスチール株式会社 | Manufacturing method for butt-welded steel tube |
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