JPH08117855A - Method for correcting bore at end of steel pipe - Google Patents
Method for correcting bore at end of steel pipeInfo
- Publication number
- JPH08117855A JPH08117855A JP25193794A JP25193794A JPH08117855A JP H08117855 A JPH08117855 A JP H08117855A JP 25193794 A JP25193794 A JP 25193794A JP 25193794 A JP25193794 A JP 25193794A JP H08117855 A JPH08117855 A JP H08117855A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- pipe end
- diameter
- reduced
- bore
- 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.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 17
- 239000010959 steel Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 2
- 210000001847 Jaw Anatomy 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000002093 peripheral Effects 0.000 description 1
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ラインパイプ等の鋼管
の管端部における内径を真円に矯正加工する方法に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for straightening the inner diameter of a pipe end of a steel pipe such as a line pipe into a perfect circle.
【０００２】[0002]
【従来の技術】従来より鋼管における管端部の加工につ
いては多種のものがあり、このうち真円に矯正加工する
ものとしては、特開昭６２−１４４８１８号，特公平２
−２４６０８号，特公昭６０−４５０１３号，特開昭５
４−２９７４号等が提案されている。2. Description of the Related Art Conventionally, there are various types of processing of a pipe end portion of a steel pipe. Among them, as a method for straightening into a perfect circle, JP-A-62-144818, JP-B-2.
-24608, JP-B-60-45013, JP-A-5
No. 4-2974 is proposed.
【０００３】そして、特開昭６２−１４４８１８号で提
案されているものは、コーンによってセグメントジョー
を外方に拡げて拡管し、矯正するというメカニカル方式
である。また、特公平２−２４６０８号で提案されてい
るものは、ローラによって拡管・縮径して真円に矯正す
る方式である。The one proposed in Japanese Laid-Open Patent Publication No. 62-144818 is a mechanical system in which a segment jaw is expanded outward by a cone to be expanded and straightened. Further, the method proposed in Japanese Examined Patent Publication No. 2-24608 is a method of expanding and reducing the diameter of a roller and correcting it into a perfect circle.
【０００４】また、特公昭６０−４５０１３号で提案さ
れているものは、内圧を付加して微小の半径方向変位を
与え、初期の不均一な残留応力分布を周上均一な応力分
布として管端部を真円に矯正する方式である。また、特
開昭５４−２９７４号で提案されているものは、油圧シ
リンダによって拡管・縮径を交互に与えて矯正する方式
である。Further, the one proposed in Japanese Examined Patent Publication No. 60-45013 gives a small radial displacement by applying an internal pressure, so that the initial non-uniform residual stress distribution is a circumferentially uniform stress distribution. It is a method to correct the part to a perfect circle. Further, the method proposed in Japanese Patent Laid-Open No. 54-2974 is a system for correcting by expanding and contracting pipes alternately by a hydraulic cylinder.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、本発明
が目的としているラインパイプ等の鋼管における管端部
の内径を真円に矯正加工する場合に上記した方式を適用
した際には、いずれの場合も加工能率が悪く、また設備
も複雑でメンテナンス上も好ましくない。さらに、設備
費も増大するという問題があった。However, when the above method is applied to correct the inner diameter of the pipe end of a steel pipe such as a line pipe to a perfect circle which is the object of the present invention, in any case However, the machining efficiency is poor, and the equipment is complicated, which is not preferable in terms of maintenance. Further, there is a problem that equipment cost also increases.
【０００６】加えて、上記したような従来の方式では、
拡管，縮径した加工部とそれ以外の部分では外径が異な
ってしまう、すなわち図２（ａ）のように縮径した場合
にあってはＤ1 ＞Ｄ2 、また図２（ｂ）のように拡径し
た場合にあってはＤ3 ＞Ｄ4となるので、指定された管
端内径許容差を満足させるために、拡管，縮径した加工
部における管端部の外径を外径許容差内にすると、それ
以外の部分が外径許容差から外れてしまうと言う問題も
ある。In addition, in the conventional system as described above,
The outer diameter differs between the pipe expanded / reduced portion and the other portion, that is, when the diameter is reduced as shown in FIG. 2 (a), D 1 > D 2 and in FIG. 2 (b). since the D 3> D 4 in the case of expanded as, in order to satisfy the specified tube end inner diameter tolerance, the tube expansion, the outer diameter of the outer diameter of the tube end in the reduced diameter processed portion If it is within the tolerance, there is also a problem that the other parts deviate from the outer diameter tolerance.
【０００７】本発明は、上記した従来の問題点に鑑みて
なされたものであり、管端部の内径の真円度を向上させ
るとともに、管端部とそれ以外の部分の外径の差を可及
的に均一に維持できる鋼管の管端内径矯正方法を提供す
ることを目的としている。The present invention has been made in view of the above-mentioned conventional problems, and improves the roundness of the inner diameter of the pipe end portion, and reduces the difference in outer diameter between the pipe end portion and other portions. It is an object of the present invention to provide a method for correcting the inner diameter of a pipe end that can be maintained as uniform as possible.
【０００８】[0008]
【課題を解決するための手段】上記した目的を達成する
ために、本発明の鋼管の管端内径矯正方法は、先ず管端
部を冷間で縮径加工した後、この縮径加工した管端部に
拡管治具を挿入し、縮径加工した部分のみを縮径分だけ
拡管することとしているのである。In order to achieve the above-mentioned object, a method of straightening the inner diameter of a pipe end according to the present invention is as follows. A tube expanding jig is inserted at the end to expand only the part that has been subjected to diameter reduction by the amount of diameter reduction.
【０００９】[0009]
【作用】本発明の鋼管の管端内径矯正方法は、先ず管端
部を冷間で縮径加工した後、この縮径加工した管端部に
拡管治具を挿入し、縮径加工した部分のみを縮径分だけ
拡管することとしているので、鋼管の内周面側から拡管
して管端部の内径を真円に矯正でき、しかも外径は管端
加工部を含め全長にわたって可及的に均一となすことが
できる。In the method for correcting the inner diameter of the pipe end of the steel pipe of the present invention, first, the pipe end is cold-reduced, and then the pipe-reducing jig is inserted into the reduced pipe end to reduce the diameter. Since only the diameter of the pipe is reduced, the inner diameter of the pipe end can be corrected to a perfect circle by expanding from the inner peripheral surface side of the steel pipe. Can be uniform.
【００１０】[0010]
【実施例】以下、本発明における鋼管の管端内径矯正方
法を図１に示す１実施例に基づいて説明する。図１は本
発明における鋼管の管端内径矯正方法を順を追って説明
する図で、（ａ）は素管状態を、（ｂ）は縮径工程を、
（ｃ）は縮径後の鋼管形状を、（ｄ）は拡管工程を示
す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for correcting the inner diameter of a steel pipe according to the present invention will be described below with reference to an embodiment shown in FIG. FIG. 1 is a diagram for sequentially explaining a method for correcting the inner diameter of a steel pipe end according to the present invention, in which (a) shows a raw pipe state, (b) shows a diameter reducing step,
(C) shows the steel pipe shape after diameter reduction, and (d) shows the pipe expanding process.
【００１１】図１において、１は管端部１ａにおける内
径を所定の許容範囲内で、かつ可及的に真円となるよう
に矯正する鋼管であり、先ず、矯正すべき管端部１ａよ
り若干中央部寄りをチャック部２で挟持した後、所定の
縮径治具３を例えば管端より押し込んで冷間状態で縮径
加工し〔図１（ｂ）参照〕、管端部１ａを図１（ｃ）に
示すような状態となす。In FIG. 1, reference numeral 1 denotes a steel pipe for straightening the inner diameter of the pipe end portion 1a within a predetermined permissible range and making it a perfect circle. First, from the pipe end portion 1a to be straightened. After a little closer to the central portion is clamped by the chuck portion 2, a predetermined diameter reducing jig 3 is pushed from the pipe end, for example, to reduce the diameter in the cold state [see FIG. 1 (b)], and the pipe end portion 1a is shown. The state is as shown in 1 (c).
【００１２】次に、この縮径加工した管端部１ａに拡管
治具４を挿入し、縮径加工した部分のみを縮径分だけ拡
管し〔図１（ｄ）参照〕、管端部１ａにおける内径を矯
正して、管端部１ａにおける内径を所定の許容範囲内と
なすとともに、しかも可及的に真円となすのである。Next, the pipe expanding jig 4 is inserted into the pipe end portion 1a having the reduced diameter, and only the portion having the reduced diameter is expanded by the reduced diameter [see FIG. 1 (d)]. The inner diameter of the pipe end portion 1a is corrected so that the inner diameter of the pipe end portion 1a is within a predetermined allowable range, and is also a perfect circle as much as possible.
【００１３】ちなみに、外径が２４４．５ｍｍ、肉厚が
１２．７ｍｍ、長さ１２０００ｍｍである呼称内径が２
１９．１ｍｍの素管の管端部１００ｍｍを、内径が２１
３ｍｍとなるように縮径加工した後、さらに内径が２１
９．１ｍｍとなるようにその管端部に２１９．１ｍｍの
径を有するプラグを油圧シリンダで押し込んで拡管し
た。この矯正加工前後における鋼管の管端部における内
径を測定した結果を表１に、また矯正後の中央部と管端
部の外径を測定した結果を表２に示す。なお、表１、表
２には併せて真円度も示した。By the way, the outer diameter is 244.5 mm, the wall thickness is 12.7 mm, the length is 12000 mm, and the nominal inner diameter is 2.
100mm of pipe end of 19.1mm raw pipe, internal diameter 21
After reducing the diameter to 3 mm, the inner diameter is 21
A plug having a diameter of 219.1 mm was pushed into the end of the pipe by a hydraulic cylinder to expand the pipe to 9.1 mm. Table 1 shows the results of measuring the inner diameters of the pipe ends of the steel pipe before and after the straightening, and Table 2 shows the results of measuring the outer diameters of the center part and the pipe ends after straightening. The roundness is also shown in Tables 1 and 2.
【００１４】[0014]
【表１】 注）真円度＝（最大内径−最小内径）／呼称内径[Table 1] Note) Roundness = (maximum inner diameter-minimum inner diameter) / nominal inner diameter
【００１５】[0015]
【表２】 注）真円度＝（最大外径−最小外径）／呼称外径 平均径＝外周長さ／π[Table 2] Note) Roundness = (maximum outer diameter-minimum outer diameter) / nominal outer diameter Average diameter = outer circumference length / π
【００１６】上記表１に示すように、管端部における内
径の真円度は矯正加工によって１．３％から０．５％に
向上している。また、表２に示すように、中央部と管端
部における平均径もほとんど変化がなく、外径の真円度
も僅かであるが向上している。As shown in Table 1 above, the roundness of the inner diameter at the end of the pipe is improved from 1.3% to 0.5% by the straightening process. Further, as shown in Table 2, the average diameters at the central portion and the pipe end portion hardly change, and the roundness of the outer diameter is slightly improved.
【００１７】[0017]
【発明の効果】以上説明したように、本発明の鋼管の管
端内径矯正方法は、先ず管端部を冷間で縮径加工した
後、この縮径加工した管端部に拡管治具を挿入し、縮径
加工した部分のみを縮径分だけ拡管することとしている
ので、簡単な設備でかつ良好な加工能率で、精度よく管
端内径の矯正がおこなえる。しかも、外径は管端加工部
を含め全長にわたって可及的に均一となすことができ
る。As described above, according to the method for correcting the inner diameter of the pipe end of the present invention, first, the pipe end is cold-reduced, and then the pipe end is subjected to the pipe expanding jig. Since only the part that has been inserted and reduced in diameter is expanded by the reduced diameter, it is possible to accurately correct the inner diameter of the pipe end with simple equipment and good processing efficiency. Moreover, the outer diameter can be made as uniform as possible over the entire length including the pipe end processing portion.
【図１】本発明における鋼管の管端内径矯正方法を順を
追って説明する図で、（ａ）は素管状態を、（ｂ）は縮
径工程を、（ｃ）は縮径後の鋼管形状を、（ｄ）は拡管
工程を示す。FIG. 1 is a diagram for sequentially explaining a method for correcting a pipe end inner diameter of a steel pipe according to the present invention, in which (a) shows a raw pipe state, (b) shows a diameter reduction process, and (c) shows a steel pipe after diameter reduction. The shape, (d) shows the tube expanding step.
【図２】従来の方式で矯正した場合の問題点の説明図
で、（ａ）は縮径した場合、（ｂ）は拡径した場合であ
る。2A and 2B are explanatory views of problems when the conventional method is used for correction, where FIG. 2A shows a case where the diameter is reduced and FIG. 2B shows a case where the diameter is enlarged.
１ 鋼管 １ａ 管端部 ３ 縮径治具 ４ 拡管治具 1 Steel Pipe 1a Pipe End 3 Diameter Reduction Jig 4 Pipe Expansion Jig
Claims (1)
法であって、先ず管端部を冷間で縮径加工した後、この
縮径加工した管端部に拡管治具を挿入し、縮径加工した
部分のみを縮径分だけ拡管することを特徴とする鋼管の
管端内径矯正方法。1. A method for correcting the inner diameter of a pipe end portion of a steel pipe, comprising first cold-reducing the pipe end portion, and then inserting a pipe expanding jig into the reduced diameter pipe end portion. A method for straightening the inner diameter of a steel pipe, which comprises expanding only the part that has been subjected to a diameter reduction process by a diameter reduction amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25193794A JP2820043B2 (en) | 1994-10-18 | 1994-10-18 | Pipe end inner diameter correction method for steel pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25193794A JP2820043B2 (en) | 1994-10-18 | 1994-10-18 | Pipe end inner diameter correction method for steel pipes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08117855A true JPH08117855A (en) | 1996-05-14 |
| JP2820043B2 JP2820043B2 (en) | 1998-11-05 |
Family
ID=17230199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25193794A Expired - Fee Related JP2820043B2 (en) | 1994-10-18 | 1994-10-18 | Pipe end inner diameter correction method for steel pipes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2820043B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060054617A (en) * | 2004-11-15 | 2006-05-23 | 경상대학교산학협력단 | Simultaneous cross-section forming and assembly of one line of hair pins |
| KR101107955B1 (en) * | 2009-05-04 | 2012-01-31 | 경북대학교 산학협력단 | Manufacturing method for automobile rear wheel tubular torsion beam |
| US20140007641A1 (en) * | 2007-03-30 | 2014-01-09 | Nippon Steel & Sumitomo Metal Corporation | Welded Component Comprising Seamless Bent Pipe and Seamless Straight Pipe Sections and Methods of Manufacturing Thereof |
| CN104096726A (en) * | 2014-07-30 | 2014-10-15 | 江苏国核管道系统工程技术研究院有限公司 | Opening shaping module of steel pipe |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4983053B2 (en) | 2006-03-09 | 2012-07-25 | 住友金属工業株式会社 | Mechanical expander and method for producing seamless steel pipe |
| JP7092200B2 (en) | 2019-02-28 | 2022-06-28 | Ｊｆｅスチール株式会社 | Manufacturing method of steel pipe |
-
1994
- 1994-10-18 JP JP25193794A patent/JP2820043B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060054617A (en) * | 2004-11-15 | 2006-05-23 | 경상대학교산학협력단 | Simultaneous cross-section forming and assembly of one line of hair pins |
| US20140007641A1 (en) * | 2007-03-30 | 2014-01-09 | Nippon Steel & Sumitomo Metal Corporation | Welded Component Comprising Seamless Bent Pipe and Seamless Straight Pipe Sections and Methods of Manufacturing Thereof |
| US9364881B2 (en) * | 2007-03-30 | 2016-06-14 | Nippon Steel & Sumitomo Metal Corporation | Welded component comprising seamless bent pipe and seamless straight pipe sections and methods of manufacturing thereof |
| KR101107955B1 (en) * | 2009-05-04 | 2012-01-31 | 경북대학교 산학협력단 | Manufacturing method for automobile rear wheel tubular torsion beam |
| CN104096726A (en) * | 2014-07-30 | 2014-10-15 | 江苏国核管道系统工程技术研究院有限公司 | Opening shaping module of steel pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2820043B2 (en) | 1998-11-05 |
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