JPH03275218A - Manufacture of double layered reducer pipe fitting - Google Patents
Manufacture of double layered reducer pipe fittingInfo
- Publication number
- JPH03275218A JPH03275218A JP7356890A JP7356890A JPH03275218A JP H03275218 A JPH03275218 A JP H03275218A JP 7356890 A JP7356890 A JP 7356890A JP 7356890 A JP7356890 A JP 7356890A JP H03275218 A JPH03275218 A JP H03275218A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- tube
- diameter
- double
- reducer
- 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
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 238000000034 method Methods 0.000 claims description 29
- 238000003825 pressing Methods 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 abstract description 4
- 239000000956 alloy Substances 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000003466 welding Methods 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000012733 comparative method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 229910001293 incoloy Inorganic materials 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明は石油、天然ガスの生産に必要な配管部材に用い
て最適な二重管レデューサ管継手の製造方法に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a double pipe reducer pipe joint that is optimal for use as a piping member necessary for the production of oil and natural gas.
［従来の技術］
近年の石油或は天然ガスの掘削環境は硫化水素或いは炭
酸ガスを多量に含んでおり、ここに使用される鋼材は高
合金鋼が主体になりつつある。高合金鋼は高価であるこ
とから、低コストで、かつ、高耐食性を有する鋼管、即
ち、鋼管の内面に高合金鋼を外面に炭素鋼を配したメカ
ニカルな二重管か開発されている。一方、これらの鋼管
の配管に必要な溶接式管継手の一つであるレデューサ管
継手（以下レデューサと称す）も高合金の単一管から製
造するのでは高価であるし、また、二重管との配管溶接
上、異種金属溶接の難しさから二重管構造のレデューサ
が望まれている。にも係わらす、この様なメカニカルに
接合された二重管からレデューサを製造する方法は未だ
検討されていない。[Prior Art] The recent oil or natural gas drilling environment contains a large amount of hydrogen sulfide or carbon dioxide gas, and the steel materials used therein are becoming mainly high-alloy steels. Since high-alloy steel is expensive, a low-cost steel pipe with high corrosion resistance has been developed, that is, a mechanical double-walled pipe in which high-alloy steel is arranged on the inner surface of the steel pipe and carbon steel is arranged on the outer surface. On the other hand, reducer pipe fittings (hereinafter referred to as reducers), which are one of the welded pipe fittings necessary for piping these steel pipes, are expensive if manufactured from a single high-alloy pipe, and double pipes are also expensive. Due to the difficulty of welding dissimilar metals, a reducer with a double pipe structure is desired. However, a method for manufacturing a reducer from such mechanically joined double pipes has not yet been studied.
［発明が解決しようとする課題］
従来、単一鋼管からのレデューサの製造方法は低コスト
で加工できることから、一般に、第４図に示すように、
上方からポンチ２によりプレスし、管１はポンチ２の外
側の形状に沿って所定の形状まて拡管成形されるか、或
は第５図に示すように、ダイス３の入口径より小さい外
径の管１がプッシャー４により下方ヘプレスされ、管１
はダイス３の内側の形状に沿って所定の形状まで縮径成
形され、この後、両端を機械加工により仕上げられて製
品となる、いわゆる、プレス方式が採用されている。[Problem to be Solved by the Invention] Conventionally, a method for manufacturing a reducer from a single steel pipe is generally performed as shown in FIG. 4 because it can be processed at low cost.
The tube 1 is pressed from above by the punch 2, and the tube 1 is expanded into a predetermined shape along the outer shape of the punch 2, or as shown in FIG. The tube 1 is pressed downward by the pusher 4, and the tube 1
A so-called press method is adopted in which the diameter of the material is reduced to a predetermined shape along the shape of the inside of the die 3, and then both ends are finished by machining to form a product.
方、特開昭５７−１４４３１号公報によれば、金属円板
から絞り加工してレゾユーザを成形する方法もあるが、
本発明では二重管を素材とする場合に有利であるプレス
方式に着目して改善を加えた。On the other hand, according to Japanese Patent Application Laid-Open No. 57-14431, there is a method of forming a reso user by drawing from a metal disk.
In the present invention, we have focused on the pressing method, which is advantageous when using double pipes as the material, and have made improvements.
このプレス方式のうちの縮径成形においては、外径−肉
厚比が５０未満の単一鋼管を対象として、技術的に確立
されている。しかしながら、外径肉厚比が５０以上につ
いては十分検討されていない。従来技術のもとで、内管
の外径−肉厚比が５０以上となる二重管からレゾユーザ
な縮径成形すると、即ち、両端スケアカットした二重管
のままで、レデューサを縮径成型すると、内管肉厚が薄
いため、縮径成形時にしわ座屈が発生し製品にならない
。即ち、従来の縮径成形技術で二重管のレデューサを製
造するためには、−回の縮径量を軽度にして繰返し数を
増やすか、あるいは、素管の重管の内管肉厚を外径−肉
厚比が５０未満と厚くするかして解決できるが、いずれ
にしてもコスト的に高価なものとなってしまい実用的で
ないことが判った。Diameter reduction forming of this press method is technically established for single steel pipes with an outer diameter-to-wall thickness ratio of less than 50. However, a case where the outer diameter/thickness ratio is 50 or more has not been sufficiently studied. Under the conventional technology, when a double tube with an inner tube outer diameter-thickness ratio of 50 or more is reduced in diameter, a reducer is formed into a double tube with a square cut at both ends. Then, since the inner tube wall thickness is thin, wrinkles and buckling occur during diameter reduction molding, resulting in failure of the product. In other words, in order to manufacture a double-pipe reducer using conventional diameter reduction molding technology, it is necessary to increase the number of repetitions by reducing the amount of diameter reduction twice, or to reduce the inner pipe wall thickness of the double pipe of the raw pipe. This can be solved by increasing the outer diameter to wall thickness ratio of less than 50, but it has been found that in either case, the cost is high and it is not practical.
本発明は、かかる状況を鑑み、単一な材質からなる鋼管
のレデューサの製造条件に近い条件でも加工が可能であ
る二重管のレゾユーザの製造方法を提供するものである
。In view of this situation, the present invention provides a method for manufacturing a double-pipe resuser that can be processed under conditions similar to those for manufacturing a steel pipe reducer made of a single material.
［課題を解決するための手段］
本発明は、外管と外径−肉厚比が５０以上である内管と
が界面においてメカニカルに接合された重管のプレス加
工によるレデューサ管継手の製造方法において、上記問
題を解決するために、縮径成形時の内管の座屈変形の防
止方法に着目してなされたもので、その要旨は、以下に
よる方法である。[Means for Solving the Problems] The present invention provides a method for manufacturing a reducer pipe joint by pressing a heavy pipe in which an outer pipe and an inner pipe having an outer diameter-to-wall thickness ratio of 50 or more are mechanically joined at the interface. In order to solve the above problem, a method for preventing buckling deformation of the inner tube during diameter reduction molding was developed, and the gist of the method is as follows.
第３図に示すように、二重管の内側に内管６を拘束する
ための拘束管７をはめ合わせ、外管５と内管６と拘束管
７の縮径加工側の先端のみを接合して一体化し、更に、
拡管加工側て内管６は外管５および拘束管７より短い三
重管とする。第１図に示すように、その三重管の拡管加
工側にポンチ２を押し込み拡管加工側を成形した後、第
２図に示すように、縮径加工側をダイス３にブツシャ−
４で押し込み、縮径加工側を成形する。As shown in Fig. 3, a restraint tube 7 for restraining the inner tube 6 is fitted inside the double tube, and only the ends of the outer tube 5, inner tube 6, and restraint tube 7 on the diameter reduction side are joined. and integrate, furthermore,
On the tube expansion process side, the inner tube 6 is a triple tube shorter than the outer tube 5 and the restraint tube 7. As shown in Fig. 1, the punch 2 is pushed into the expanded side of the triple pipe to form the expanded side, and then the diameter-reduced side is punched into the die 3 as shown in Fig. 2.
Push in step 4 to form the reduced diameter side.
［作用コ
以下、この発明の詳細な説明する。両端スヶアカットの
ままの二重管からレデューサを製造する場合を考えてみ
る。縮径成形加工するときに、外管自体が縮径すると共
に内管をも縮径するために、外管はダイス及び内管から
の面圧を受ける。[Function] The present invention will be explained in detail below. Let's consider the case where a reducer is manufactured from a double tube with a gap cut at both ends. During diameter reduction forming, the outer tube itself is reduced in diameter and the inner tube is also reduced in diameter, so the outer tube is subjected to surface pressure from the die and the inner tube.
そのため、外管は加工上内外面から拘束されることから
座屈を起こしにくくなっている。しかしながら、内管の
変形は外管からの面圧によってのみ縮径成形されるため
、加工上からは、内管は単管の加工とほぼ同じ条件で加
工される。したがって、内管は内面の拘束がなく、肉厚
が薄くなるとシワ座屈が発生し易くなる。この様なこと
から、内管にも内面からの面圧を（＝Ｊ与すべく、二重
管の内側に拘束管を加えた三重管構造とした。これによ
り、薄肉の内管のシワ発生を抑制することが可能になり
、縮径成形限界を向上させることになる。更に、縮径成
形の前に拡管成形をプラスすると最終的なレデューサの
口絞り率の限界がより向上する。Therefore, the outer tube is restrained from the inner and outer surfaces during processing, making it less likely to buckle. However, since the inner tube is deformed only by surface pressure from the outer tube, the inner tube is processed under almost the same conditions as a single tube. Therefore, the inner tube has no inner surface constraint, and as the wall thickness becomes thinner, wrinkle buckling is more likely to occur. For this reason, in order to apply surface pressure (=J) from the inner surface to the inner tube, we adopted a triple tube structure in which a restraining tube was added inside the double tube. This makes it possible to suppress this, thereby improving the limit of diameter reduction forming.Furthermore, adding tube expansion forming before diameter reduction forming further improves the limit of the final reducer opening rate.
また、周方向応力を低減するために、三重管の内管には
軸方向に引張応力を付与することが有効であることから
、第３図に示すように三重管の縮径加工先端のみを接合
一体化し、プレス側での内管は外管および拘束管よりや
や短くした三重管構造のレデューサ素管とした。これに
より、外管と拘束管のみをプレスでき、成形時には内管
に軸方向の引張荷重が作用するため、変形に必要な周方
向応力の低減が可能となり、更に座屈発生も制御され、
より加工限界を向上させることが可能となる。In addition, in order to reduce the circumferential stress, it is effective to apply tensile stress in the axial direction to the inner tube of the triple tube, so only the diameter-reduced tip of the triple tube is reduced as shown in Figure 3. The reduced tube was made into a triple tube structure, with the inner tube on the press side being slightly shorter than the outer tube and restraint tube. This allows only the outer tube and restraint tube to be pressed, and since an axial tensile load is applied to the inner tube during forming, it is possible to reduce the circumferential stress required for deformation, and the occurrence of buckling is also controlled.
It becomes possible to further improve the processing limit.
プレス成形後、三重管の縮径加工側の先端を所定の位置
で切断し、拡管加工側に拘束管のみを押し抜いて、二重
管とし、さらに、両管端を切削してレデューサにイ±」
二げる。After press forming, cut the end of the triple pipe on the reduced diameter side at a predetermined position, push out only the restrained pipe on the expanded pipe side to make a double pipe, and then cut both pipe ends to install into the reducer. ±”
Second.
［実施例］
以下、本発明の一実施例を第１表により説明する。第１
表には、ポンチ半角１０°のポンチとダイス半角１０°
のダイスを用い、材質がＡＰＩ Ｘ７０て外径２６７、
４ｍｍ （Ｉ Ｏ＋）、肉厚６．４ｍｍの外管に、材質
がインコロイ８２５で肉厚３．０ｍｍの内管である二重
管を素管とし、従来法としては両端スケアカットのまま
、比較法としては二重管の縮径加工側のみの管端に溶接
を施したもの、更に、材質は普通鋼で肉厚が４．０ｍｍ
拘束管を接合した本発明の三重管の方法による加工限界
を、加工後の外径と加工前の外径との比、即ち、口絞り
率で示す。[Example] An example of the present invention will be described below with reference to Table 1. 1st
The table shows a punch with a half-width of 10° and a die with a half-width of 10°.
The material is API X70 and the outer diameter is 267.
4mm (I O+), an outer tube with a wall thickness of 6.4mm, and a double tube made of Incoloy 825 and a wall thickness of 3.0mm as the inner tube, and compared with the conventional method, both ends were left square-cut. The method is to weld the pipe end only on the reduced diameter side of the double pipe, and the material is ordinary steel with a wall thickness of 4.0 mm.
The processing limit of the triple pipe of the present invention in which restraint pipes are joined is shown by the ratio of the outer diameter after processing to the outer diameter before processing, that is, the neck drawing ratio.
本発明による方法は従来法および比較法に比べてはるか
に加工限界が向上していることがわかった。即ち、二重
管のレデューサの製造方法として、三乗管構造とし、か
つ、縮径加工側の加工先端を接合一体化することと外管
と拘束管を拡管および縮径成形することにより内管の座
屈限界の向上に有効であることが示される。It was found that the method according to the present invention has a much improved processing limit compared to the conventional method and the comparative method. In other words, as a manufacturing method for a double-pipe reducer, the inner tube is formed by forming a cubic tube structure, joining and integrating the processed tip on the diameter-reducing side, and expanding and reducing the outer tube and the constrained tube. It is shown that this method is effective in improving the buckling limit of
なお、第１表より明らかなように、拘束管のない二重管
においても縮径加工側を溶接し、かつ、外管のみをプレ
ス加工することにより、スケアカットの二重管を成形す
るよりも道かに有効であるし、内管の肉厚か厚くなれば
、この方法でも十分に実用的である。As is clear from Table 1, even in a double pipe without a restraint pipe, by welding the diameter-reduced side and pressing only the outer pipe, it is possible to form a double pipe with a square cut. This method is also effective, and if the inner tube is thick enough, this method is also quite practical.
本発明によれば、二重管レデューサ成形後に、内管およ
び外管を分離して、それぞれに適正な熱処理を施し、ま
た組み合わせた材質の優れた二重管レデューサも可能で
あるし、更に、内管のみを使用する薄肉レデューサの製
造方法にも適用できることは明らかである。According to the present invention, after forming the double tube reducer, it is possible to separate the inner tube and the outer tube and apply appropriate heat treatment to each, and it is also possible to create a double tube reducer with excellent materials by combining them. It is clear that the present invention can also be applied to a method of manufacturing a thin-walled reducer using only an inner tube.
第１表
［発明の効果］
この発明の二重管のレデューサの製造方法は、高合金を
使用する過酷な環境において、安価な、かつ、優れた耐
食性を有するレデューサを提供することになり、工業の
発展に寄与することができる。Table 1 [Effects of the Invention] The method for manufacturing a double-pipe reducer of the present invention provides a reducer that is inexpensive and has excellent corrosion resistance in harsh environments using high alloys, and can be used for industrial purposes. can contribute to the development of
第１図は本発明の三重管法によるレデューサ拡管成形法
の概念断面図、第２図は本発明の三重管法によるレデュ
ーサ縮径成形法の概念断面図、第３図は本発明の三重管
素管の構成断面図、第４図は従来の拡管法によるレデュ
ーサ成形法の概略断面図、第５図は従来の縮径法による
レデューサ成形法の概略断面図を示す。
１・・・管、２・・・ポンチ、３・・・ダイス、４・・
・プッシャー、５・・・外管、６・・・内管、７・・・
拘束管、ａ・・・隙間、Ｗ・・・接合部。Fig. 1 is a conceptual cross-sectional view of the reducer tube expansion forming method using the triple tube method of the present invention, Fig. 2 is a conceptual cross-sectional view of the reducer diameter reduction forming method using the triple tube method of the present invention, and Fig. 3 is a conceptual cross-sectional view of the reducer diameter forming method using the triple tube method of the present invention. FIG. 4 is a schematic sectional view of a conventional reducer forming method using a tube expansion method, and FIG. 5 is a schematic sectional view of a conventional reducer forming method using a diameter reduction method. 1...Tube, 2...Punch, 3...Dice, 4...
・Pusher, 5...Outer tube, 6...Inner tube, 7...
Restricted pipe, a... gap, W... joint.
Claims (1)
においてメカニカルに接合された二重管のプレス加工に
よるレデューサ管継手の製造方法において、二重管の内
側に内管を拘束するための拘束管をはめ合わせ、外管と
内管と拘束管の縮径加工側の先端のみを接合して一体化
し、更に、拡管加工側で内管は外管および拘束管より短
い三重管とし、拡管加工側にポンチを押し込み拡管加工
側を成形した後、縮径加工側をダイスに押し込み、縮径
加工側を成形することを特徴とする二重管レデューサ管
継手の製造方法。1. In a method for manufacturing a reducer pipe joint by pressing a double pipe in which an outer pipe and an inner pipe having an outer diameter-wall thickness ratio of 50 or more are mechanically joined at the interface, an inner pipe is placed inside the double pipe. The outer tube, the inner tube, and the tips of the constraint tube on the diameter-reduced side are joined and integrated, and the inner tube is shorter than the outer tube and the constraint tube on the expanded tube side. A method for manufacturing a double-pipe reducer pipe joint, characterized in that the triple-pipe pipe is made into a double-pipe pipe, and the expanded pipe side is formed by pushing a punch into the pipe-expanded side, and then the diameter-reduced side is pushed into a die to form the diameter-reduced side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7356890A JPH03275218A (en) | 1990-03-26 | 1990-03-26 | Manufacture of double layered reducer pipe fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7356890A JPH03275218A (en) | 1990-03-26 | 1990-03-26 | Manufacture of double layered reducer pipe fitting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03275218A true JPH03275218A (en) | 1991-12-05 |
Family
ID=13522007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7356890A Pending JPH03275218A (en) | 1990-03-26 | 1990-03-26 | Manufacture of double layered reducer pipe fitting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03275218A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100466067B1 (en) * | 2002-05-16 | 2005-01-13 | 이도연 | Method of pressing a reducing pipe |
-
1990
- 1990-03-26 JP JP7356890A patent/JPH03275218A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100466067B1 (en) * | 2002-05-16 | 2005-01-13 | 이도연 | Method of pressing a reducing pipe |
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