JPH09108711A - Manufacture of resistance welded tube - Google Patents

Manufacture of resistance welded tube

Info

Publication number
JPH09108711A
JPH09108711A JP27076895A JP27076895A JPH09108711A JP H09108711 A JPH09108711 A JP H09108711A JP 27076895 A JP27076895 A JP 27076895A JP 27076895 A JP27076895 A JP 27076895A JP H09108711 A JPH09108711 A JP H09108711A
Authority
JP
Japan
Prior art keywords
tube
resistance welded
pipe
electric resistance
thickness
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP27076895A
Other languages
Japanese (ja)
Inventor
Satoru Sato
哲 佐藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP27076895A priority Critical patent/JPH09108711A/en
Publication of JPH09108711A publication Critical patent/JPH09108711A/en
Withdrawn legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To eliminate uneven thickness produced in base stock, forming and bead grinding, to allow on-line tube making of a steel tube having a satisfactory dimensional precision comparable to a conventional drawn tube, and to obtain a technology of liberalizing a schedule for resistance welded tube such as reduction in the number of times of changing rolls. SOLUTION: In the routine process for a resistance welded tube making machine, drawing is performed on the outer diameter of a tube by imparting a reduction rate of area of 10% or more using a caliber roll, and successively, rolling is carried out for the tube thickness by means of an internal tool. Thus, it is possible to increase the reduction rate of area and also to suppress the incidental degradation of thickness precision; as a result, a resistance welded tube is obtained with an extremely high dimensional precision, along with implementation of coping with a small lot incident to a base tube intensive operation.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、電縫鋼管の造管工
程において、極めて生産性が高く、かつ極めて寸法精度
の良好な電縫鋼管を製造する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 for producing an electric resistance welded steel pipe having extremely high productivity and extremely high dimensional accuracy in a process for producing an electric resistance welded steel pipe.

【0002】[0002]

【従来の技術およびその課題】一般に電縫鋼管はホット
コイルを素材として、造管工程でロール成形・電縫溶接
・ロール定形されて製造されるが、この際、素材スケル
プのクラウンに加えて、板を管状にロール成形する過程
では板搬送のため、ある程度の圧下を加えざるを得ない
ため板幅中央部厚みの減少、また溶接開先形状確保のた
めエッジ成形が必要であるが、このため板エッジ部の増
肉がそれぞれ発生する。その後の溶接で生じたビード
は、バイトで切削されるが、この際切削形状のバラツキ
も発生する。さらに、定形機で10%程度以上のリダク
ションを与えると管内面に角張りが発生する。これらは
いずれも管の円周方向の肉厚差(偏肉)となり、製品鋼
管の肉厚精度を著しく悪化させる。これら偏肉原因の
内、定形機のリダクションについては、角張りが問題に
ならない程度の低リダクションに抑えることで対応可能
であるが、この結果ロール組み替え回数が増加する等生
産性を悪化させている。
2. Description of the Related Art Generally, electric resistance welded steel pipe is manufactured by hot roll forming, roll forming, electric resistance welding, and roll shaping using a hot coil as a material. At this time, in addition to the crown of the material skelp, In the process of roll-forming a plate into a tubular shape, it is necessary to apply a certain amount of reduction to convey the plate, so it is necessary to reduce the thickness of the central part of the plate width and to form an edge to secure the weld groove shape. Thickening of the plate edge occurs. The bead produced by the subsequent welding is cut with a cutting tool, but at this time, the cutting shape also varies. Further, if a reduction of about 10% or more is applied by a regular machine, the inner surface of the pipe will be squared. Any of these causes a difference in wall thickness (uneven wall thickness) in the circumferential direction of the pipe, which significantly deteriorates the wall thickness accuracy of the product steel pipe. Among these causes of uneven thickness, it is possible to deal with the reduction of the regular machine by suppressing it to a low reduction to the extent that squareness is not a problem, but as a result, productivity is deteriorated due to an increase in the number of roll replacements. .

【0003】一方、継ぎ目無し鋼管に比べ元来寸法精度
の良い電縫鋼管についても、近年は自動車、産業機械分
野等の鋼管加工の省略または簡易化要求が極めて強く、
電縫鋼管の寸法精度の大幅な向上が求められているが、
従来の造管技術では対応困難であるため、造管された鋼
管を母管としてオフラインで低能率の引抜き加工をせざ
るを得ず、コスト上対応に限界があった。
On the other hand, with regard to electric resistance welded steel pipes which are originally higher in dimensional accuracy than seamless steel pipes, in recent years, there is a strong demand for omission or simplification of steel pipe processing in the fields of automobiles, industrial machinery, etc.
Although it is required to improve the dimensional accuracy of ERW pipes significantly,
Since it is difficult to deal with the problem with the conventional pipe making technology, there is no choice but to perform the low-efficiency drawing process off-line by using the produced steel pipe as the mother pipe.

【0004】[0004]

【課題を解決するための手段】本発明はこの点に着目
し、電縫鋼管の既存の造管設備を活用しつつ、定形機に
カリバーロールと内面工具からなる絞り圧延スタンドを
付加することにより、素材、成形、ビード切削で発生し
た偏肉を解消し、従来の引抜き鋼管並の寸法精度の良好
な鋼管を造管オンラインで提供することが可能となると
同時に、定形機のリダクションを挙げることが可能とな
り、ロール組み替え回数の減少等電縫鋼管のスケジュー
ルフリー化技術をも提供するものである。その発明の要
旨とするところは、 (1)電縫鋼管造管機の定形工程において、カリバーロ
ールを用いて10%以上の減面率を付与して管の外径絞
りを行うと共に、引続き内面工具にて管厚の圧延を行う
ことを特徴とする電縫鋼管の製造方法。
In view of this point, the present invention utilizes the existing pipe making equipment for electric resistance welded steel pipes and adds a drawing and rolling stand consisting of a caliber roll and an inner surface tool to a shaping machine. , It is possible to eliminate uneven thickness caused by material, forming, and bead cutting, and to provide steel pipes with good dimensional accuracy comparable to conventional drawn steel pipes online at the same time as the reduction of the shaping machine. It will also be possible to provide a schedule-free technology for ERW steel pipes, such as reducing the number of roll changes. The gist of the invention is as follows: (1) In a shaping process of an electric resistance welded steel pipe forming machine, a caliber roll is used to impart a surface reduction rate of 10% or more to reduce the outer diameter of the pipe, and continuously A method for producing an electric resistance welded steel pipe, which comprises rolling the pipe thickness with a tool.

【0005】(2)電縫鋼管造管機の定形工程におい
て、通常の定形機でのロールを順次45°づつずらして
配設した45°傾斜ロールを用いて10%以上の減面率
を付与して管の外径絞りを行うと共に、引続き内面工具
にて管厚の圧延を行うことを特徴とする電縫鋼管の製造
方法にある。
(2) In the forming process of an electric resistance welded steel pipe forming machine, a surface reduction rate of 10% or more is given by using 45 ° inclined rolls arranged by sequentially shifting the rolls of the ordinary forming machine by 45 °. Then, the outer diameter of the pipe is reduced, and then the thickness of the pipe is continuously rolled with an inner surface tool to provide a method for manufacturing an electric resistance welded steel pipe.

【0006】[0006]

【実施例】以下本発明について実施例である図面に従っ
て詳細に説明する。図1は本発明に係る電縫鋼管の造管
工程図である。図1に示すように、スリットコイル1は
複数対の垂直ロールと水平ロールとからなる成形機2に
より管状に成形された後、この管形の継目を例えば高周
波誘導加熱溶接の溶接機3で溶接される。溶接で生じた
内外面ビードは溶接直後バイトで切削され、内面ビード
は成形機側へ誘導された後、外面ビードは切削直後それ
ぞれ除去される。その後溶接部を緩冷却された管は定形
機4で外径が絞られた後矯正機5で曲がり矯正を行った
後、所望の寸法に走行切断機6を用いて切断される。切
断後の鋼管7は通常のように、管端加工と防食加工等を
行って製品とされる。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings which are embodiments. FIG. 1 is a process drawing of the electric resistance welded steel pipe according to the present invention. As shown in FIG. 1, the slit coil 1 is formed into a tubular shape by a forming machine 2 including a plurality of pairs of vertical rolls and horizontal rolls, and then the tubular seam is welded by, for example, a welding machine 3 for high frequency induction heating welding. To be done. The inner and outer beads formed by welding are cut by a bite immediately after welding, the inner bead is guided to the molding machine side, and the outer bead is removed immediately after cutting. After that, the welded part is cooled slowly, the outer diameter of the pipe is reduced by the shaping machine 4, the straightening machine 5 is used for straightening, and then the traveling cutting machine 6 is used to cut the pipe to a desired size. The steel pipe 7 after cutting is subjected to pipe end processing, anticorrosion processing and the like as usual to obtain a product.

【0007】図2は本発明の一実施例を示す定形機の説
明図である。図2に示すように、例えば高周波誘導加熱
溶接機で溶接された鋼管は通常の定形機でのロールを順
次45°づつずらして配設し、第1スタンド8を垂直、
第2スタンド9を45°傾斜させ、更に第3スタンド1
0を第1スタンド8に対し直交するように設置し、第4
スタンド11を更に第2スタンド9とは対象的に45°
傾斜させた後最終第5スタンド12を垂直に設けたもの
である。これによって通常ロールによる高減面率による
円周方向での角張り偏肉の発生を防止し、所定の肉厚に
外径絞りが行われる。
FIG. 2 is an explanatory view of a fixed form machine showing an embodiment of the present invention. As shown in FIG. 2, for example, in a steel pipe welded by a high-frequency induction heating welding machine, the rolls in a normal shaping machine are sequentially arranged at 45 ° intervals, and the first stand 8 is set vertically.
The second stand 9 is tilted at 45 °, and the third stand 1
0 is installed orthogonally to the first stand 8 and
The stand 11 is further 45 ° in contrast to the second stand 9.
After tilting, the final fifth stand 12 is provided vertically. This prevents the occurrence of angular uneven thickness in the circumferential direction due to the high surface reduction rate of the normal roll, and the outer diameter is reduced to a predetermined wall thickness.

【0008】図3は本発明に係る内面ビード切削を示す
断面図である。図3に示すように、鋼管13の内面溶接
ビードをビード切削用のカッター15はカッターホルダ
16の外周に設けられてある。そしてカッターは位置決
めされ、内面溶接ビード14はこのカッター15により
切削される。切削屑17はカッターホルダ16の切削逃
げ道18を通って素管の内面底部に落下し、以降は素管
と共に排出される。符号19はビード切削用カッター保
持用ローラーであり、カッターホルダ16には潤滑油道
20が設けられている。
FIG. 3 is a sectional view showing the inner bead cutting according to the present invention. As shown in FIG. 3, a cutter 15 for bead cutting the inner weld bead of the steel pipe 13 is provided on the outer periphery of a cutter holder 16. Then, the cutter is positioned, and the inner weld bead 14 is cut by the cutter 15. The cutting waste 17 passes through the cutting escape passage 18 of the cutter holder 16 and drops to the bottom of the inner surface of the raw pipe, and thereafter is discharged together with the raw pipe. Reference numeral 19 is a bead cutting cutter holding roller, and the cutter holder 16 is provided with a lubricating oil passage 20.

【0009】図4は本発明に係る冷間圧延加工装置の断
面図である。この冷間圧延加工装置は電縫鋼管製造ライ
ンの溶接機の下流に配置され、しかもこの冷間圧延加工
装置は圧延スタンド21とこの圧延スタンドの同心が近
傍に位置して中空の内面工具22とから構成される。こ
の中空の内面工具22は溶接工程の上流で支持してあっ
て、本管の内部を延在している中空の内面工具本体の先
端で支持される。この中空の内面工具22の途中の壁部
に潤滑油出口23を形成して上流より潤滑油道20を介
して供給する。
FIG. 4 is a sectional view of a cold rolling apparatus according to the present invention. This cold rolling apparatus is arranged downstream of the welding machine of the electric resistance welded steel pipe production line. Further, this cold rolling apparatus has a rolling stand 21 and a hollow inner surface tool 22 which is concentric with the rolling stand. Composed of. The hollow inner tool 22 is supported upstream of the welding process, and is supported by the tip of the hollow inner tool body extending inside the main pipe. A lubricating oil outlet 23 is formed in the wall partway of the hollow inner surface tool 22 and is supplied from the upstream through the lubricating oil passage 20.

【0010】そして絞り圧延スタンドは基本的に定形機
のロール定形スタンドと同等の構造であるが、内面工具
で肉厚を圧延するために高剛性仕様となっている。一
方、内面工具22は成形機中段から管内に挿入されたマ
ンドレルで長手方向に移動可能に保持されており、更に
マンドレルを通して前述したように、例えば水溶性潤滑
油が供給されるようになっている。また、内面工具の交
換は定形機以降の材料を抜き出した後定形機入り側位置
のマンドレルピン(図示せず)を脱着することで容易に
実施できる。
The squeezing and rolling stand has basically the same structure as the roll sizing stand of the sizing machine, but has a high rigidity specification because the inner surface tool is used to roll the wall thickness. On the other hand, the inner surface tool 22 is movably held in the longitudinal direction by a mandrel inserted into the pipe from the middle stage of the molding machine, and further, for example, water-soluble lubricating oil is supplied through the mandrel as described above. . Further, the exchange of the inner surface tool can be easily carried out by extracting the material after the shaping machine and then removing and attaching the mandrel pin (not shown) at the position on the entry side of the shaping machine.

【0011】更に内面工具について詳述すれば、2段テ
ーパー付きマンドレル状に形成し、圧延部は耐磨耗コー
ティングされた約500mm程度の長さを持ち、圧延中
はマンドレル周方向に配設された複数個のノズルから水
溶性潤滑油を吹き付け潤滑されると共に冷却され、さら
に長手方向に移動されることで電縫鋼管のロットに対応
する寿命を得ることが出来る。このようにして、定形機
の下流に内面工具付きスタンドを設けることで、ビード
偏肉等を圧延し、肉厚精度を向上するものである。
The inner surface tool will be described in more detail. The inner surface tool is formed into a two-step tapered mandrel shape, and the rolling portion has a length of about 500 mm which is wear-resistant coated and is arranged in the circumferential direction of the mandrel during rolling. Further, the water-soluble lubricating oil is sprayed from a plurality of nozzles to be lubricated, cooled, and further moved in the longitudinal direction, so that a life corresponding to the lot of the electric resistance welded steel pipe can be obtained. In this way, by providing the stand with the inner surface tool on the downstream side of the shaping machine, the bead uneven thickness or the like is rolled, and the thickness accuracy is improved.

【0012】[0012]

【発明の効果】以上述べたように、本発明によって減面
率を高め、しかもそれに伴う肉厚精度の悪化を抑制する
ことが可能となり、母管集約に伴う小ロット対応を実現
しながら、極めて優れた寸法精度の高い電縫鋼管を製造
することが出来た。
As described above, according to the present invention, it is possible to increase the area reduction rate and to suppress the deterioration of the wall thickness accuracy due to it. We were able to manufacture ERW steel pipes with excellent dimensional accuracy.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明に係る電縫鋼管の造管工程図、FIG. 1 is a process drawing of an electric resistance welded steel pipe according to the present invention,

【図2】本発明の一実施例を示す定形機の説明図、FIG. 2 is an explanatory view of a fixed form machine showing one embodiment of the present invention,

【図3】本発明に係る内面ビード切削を示す断面図、FIG. 3 is a cross-sectional view showing internal bead cutting according to the present invention,

【図4】本発明に係る冷間圧延加工装置の断面図であ
る。
FIG. 4 is a sectional view of a cold rolling apparatus according to the present invention.

【符号の説明】[Explanation of symbols]

1 スリットコイル 2 成形機 3 溶接機 4 定形機 5 矯正機 6 走行切断機 7、13 鋼管 8 第1スタンド 9 第2スタンド 10 第3スタンド 11 第4スタンド 12 第5スタンド 14 内面溶接ビード 15 カッター 16 カッターホルダ 17 切削屑 18 切削逃げ道 19 ビード切削用カッター保持用ローラー 20 潤滑油道 21 圧延スタンド 22 内面工具 23 潤滑油出口 1 Slit Coil 2 Forming Machine 3 Welding Machine 4 Standard Forming Machine 5 Straightening Machine 6 Running Cutting Machine 7, 13 Steel Pipe 8 1st Stand 9 2nd Stand 10 3rd Stand 11 4th Stand 12 5th Stand 14 Inner Welding Bead 15 Cutter 16 Cutter holder 17 Cutting debris 18 Cutting escape path 19 Cutter holding roller for bead cutting 20 Lubricating oil path 21 Rolling stand 22 Inner surface tool 23 Lubricating oil outlet

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 電縫鋼管造管機の定形工程において、カ
リバーロールを用いて10%以上の減面率を付与して管
の外径絞りを行うと共に、引続き内面工具にて管厚の圧
延を行うことを特徴とする電縫鋼管の製造方法。
1. In a standard process of an electric resistance welded steel pipe forming machine, a caliber roll is used to impart a surface reduction rate of 10% or more to reduce the outer diameter of the pipe, and then the inner surface tool is used to roll the pipe thickness. A method for manufacturing an electric resistance welded steel pipe, which comprises:
【請求項2】 電縫鋼管造管機の定形工程において、通
常の定形機でのロールを順次45°づつずらして配設し
た45°傾斜ロールを用いて10%以上の減面率を付与
して管の外径絞りを行うと共に、引続き内面工具にて管
厚の圧延を行うことを特徴とする電縫鋼管の製造方法。
2. A surface-reduction rate of 10% or more is imparted in a forming process of an electric resistance welded pipe forming machine by using 45 ° inclined rolls arranged by sequentially shifting the rolls in the ordinary forming machine by 45 °. The method for producing an electric resistance welded steel pipe is characterized in that the outer diameter of the pipe is reduced and the pipe thickness is continuously rolled by an inner surface tool.
JP27076895A 1995-10-19 1995-10-19 Manufacture of resistance welded tube Withdrawn JPH09108711A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27076895A JPH09108711A (en) 1995-10-19 1995-10-19 Manufacture of resistance welded tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27076895A JPH09108711A (en) 1995-10-19 1995-10-19 Manufacture of resistance welded tube

Publications (1)

Publication Number Publication Date
JPH09108711A true JPH09108711A (en) 1997-04-28

Family

ID=17490734

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27076895A Withdrawn JPH09108711A (en) 1995-10-19 1995-10-19 Manufacture of resistance welded tube

Country Status (1)

Country Link
JP (1) JPH09108711A (en)

Similar Documents

Publication Publication Date Title
CN102527767B (en) Cold drawing welded tube manufacture process for high-accuracy hydraulic oil cylinder
US2959849A (en) Method and apparatus for making pipe
US4445354A (en) Procedure and equipment for the manufacture of pipes with external and internal diameters varying in stages
JPH09108711A (en) Manufacture of resistance welded tube
JP2722926B2 (en) Method and apparatus for manufacturing welded pipe
JP4306079B2 (en) ERW steel pipe manufacturing method and equipment row
CN101190444B (en) Method for manufacturing titanium or titanium alloy tube of 12 to 16 meters
US5647241A (en) Rotary upper roll selector
US2083698A (en) Push bench method and apparatus
JP2004148337A (en) Method for forming joined part of welded steel pipe and apparatus for producing the welded steel pipe
EP1738840A1 (en) Cold rolling process for metal tubes
SU893280A1 (en) Tube production method
RU2084300C1 (en) Line for making precise tubes
JP4250849B2 (en) ERW steel pipe manufacturing method and equipment row
JP3946534B2 (en) Manufacturing method of ERW steel pipe with excellent outer diameter shape
JP2642575B2 (en) Welding tube forming method and forming stand
CN114210761A (en) High-frequency induction seamless titanium welded pipe and production method thereof
JPH07308703A (en) Rolling method with elongator
SU1523210A1 (en) Method of producing longitudinal welded tubes and tube-welding mill for effecting same
SU1205961A1 (en) Method of producing welded tubes
JPH08267127A (en) Production of metallic welded pipe
RU2297896C2 (en) Method for producing conversion straight-seam tube blank from titanium base alloys for rolling cold rolled large and mean diameter tubes with improved accuracy of wall geometry
CA1239778A (en) Method for forming an electric resistance welded steel pipe
SU274283A1 (en) METHOD OF MANUFACTURING PIPES FROM TWO ROLLED STRIPS
CN111360490A (en) Manufacturing process of low-inner-weld-joint high-frequency welded pipe

Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20030107