JPH04331884A - Bellows pipe and manufacture thereof - Google Patents
Bellows pipe and manufacture thereofInfo
- Publication number
- JPH04331884A JPH04331884A JP12868091A JP12868091A JPH04331884A JP H04331884 A JPH04331884 A JP H04331884A JP 12868091 A JP12868091 A JP 12868091A JP 12868091 A JP12868091 A JP 12868091A JP H04331884 A JPH04331884 A JP H04331884A
- Authority
- JP
- Japan
- Prior art keywords
- bellows tube
- vicinity
- bellows pipe
- corrugated
- corrugated wall
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 239000002184 metal Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 2
- 230000006835 compression Effects 0.000 abstract 2
- 238000007906 compression Methods 0.000 abstract 2
- 238000005336 cracking Methods 0.000 abstract 1
- 239000011295 pitch Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
Description
【0001】0001
【産業上の利用分野】本発明は一般に自動車或いは各種
機械、設備装置にあって、配管接続部の可撓継手或いは
可撓管自体として使用される蛇腹管及びその製造方法に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a bellows tube used as a flexible joint for a piping connection or as a flexible tube itself in automobiles or various machines and equipment, and a method for manufacturing the same.
【0002】0002
【従来の技術】従来、この種の蛇腹管としては例えば図
3に示すように、金属管材(12)の周面に複数の波形
壁(13)を部分的に膨出して蛇腹管(11)を構成し
ていた。2. Description of the Related Art Conventionally, as shown in FIG. 3, a bellows pipe (11) of this type has been constructed by partially protruding a plurality of corrugated walls (13) on the circumferential surface of a metal pipe (12). It consisted of
【0003】0003
【発明が解決しようとする課題】しかしながら、このよ
うな従来の技術においては、前記波形壁(13)の頂部
(13’) 附近にあって、膨出加工時の伸びによる引
張り方向の応力の残留によって機械的強度の劣化を招き
、主に蛇腹管として圧縮状態での使用時において疲労等
により亀裂、破損を生ぜしめる問題を有する傾向にあっ
た。[Problems to be Solved by the Invention] However, in such a conventional technique, residual stress in the tensile direction due to elongation during the bulging process is generated near the top (13') of the corrugated wall (13). This causes deterioration in mechanical strength, and tends to cause cracks and breakage due to fatigue, mainly when used in a compressed state as a bellows tube.
【0004】本発明は従来技術の有するこれら問題に鑑
みてなされたものであり、該頂部附近に圧縮応力を残留
せしめて機械的強度を増し、圧縮状態での使用時にあっ
ても頂部附近での亀裂、破損の生ずる憂いを軽減、防止
できる蛇腹管及びその製造方法を提案することを目的と
するものである。The present invention has been made in view of these problems of the prior art, and increases mechanical strength by allowing compressive stress to remain in the vicinity of the top, so that even when used in a compressed state, there is no stress in the vicinity of the top. The object of the present invention is to propose a bellows tube and a method for manufacturing the same that can reduce and prevent the problems of cracks and breakage.
【0005】[0005]
【課題を解決するための手段】本発明は上記目的を達成
するため、金属管材の周面に、該周面に沿って波形壁を
有してなる蛇腹管において、前記各波形壁の外側頂部附
近に圧縮応力を残留せしめた蛇腹管、並びに、金属管材
の周面に複数の波形壁を部分的に膨出して形成された蛇
腹管の前記波形壁の頂部附近を、蛇腹管の中心軸線に対
して略等間隔に配設された押えロールを用いて径方向の
外方より転動押圧して構成する蛇腹管の製造方法をそれ
ぞれ要旨とするものである。[Means for Solving the Problems] In order to achieve the above object, the present invention provides a bellows pipe having a corrugated wall along the circumferential surface of a metal tube, in which the outer top of each of the corrugated walls is A bellows pipe in which compressive stress remains in the vicinity, and a bellows pipe formed by partially bulging out a plurality of corrugated walls on the circumferential surface of a metal pipe material. On the other hand, the gist of each is a method of manufacturing a bellows tube, which is constructed by rolling and pressing from the outside in the radial direction using presser rolls arranged at approximately equal intervals.
【0006】[0006]
【作用】本発明は従来の波形壁を形成する一次加工の後
に、前記波形壁の頂部附近において、径方向の外方より
複数の押えロールにより該頂部附近を転動押圧して該頂
部附近に押圧に伴う圧縮方向への残留応力を発生させ機
械的強度を増すことができると共に、頂部附近に滑かな
曲面を形成できると共に、波形壁の倒れや不等ピッチの
矯正等も可能となり、従って製品として例え曲げ方向へ
の無理な接続下にあっても長期に亘り頂部附近での耐疲
労強度、特に圧縮状態での使用時における疲労強度を高
めて亀裂、破損を軽減、防止することができることとな
る。[Operation] After the conventional primary processing for forming a corrugated wall, the present invention rolls and presses the vicinity of the top of the corrugated wall from the outside in the radial direction with a plurality of presser rolls. It is possible to increase the mechanical strength by generating residual stress in the compressive direction due to pressing, and it is also possible to form a smooth curved surface near the top, and it is also possible to correct the collapse of corrugated walls and uneven pitches. As a result, it is possible to reduce and prevent cracks and breakage by increasing the fatigue strength near the top over a long period of time, especially when used in a compressed state, even if the connection is forced in the bending direction. Become.
【0007】[0007]
【実施例】以下、本発明の実施例を図面に基づいて説明
すれば、図1は本発明の蛇腹管の一部切欠き平面図、図
2は本発明の蛇腹管の製造方法を示す横断説明図であり
、本発明では図3のように一次加工が施された蛇腹管か
ら出発する。[Example] Hereinafter, embodiments of the present invention will be described based on the drawings. Fig. 1 is a partially cutaway plan view of the bellows pipe of the present invention, and Fig. 2 is a cross-sectional view showing a method of manufacturing the bellows pipe of the present invention. FIG. 3 is an explanatory diagram, and the present invention starts from a bellows tube that has been subjected to primary processing as shown in FIG. 3.
【0008】次に施す二次加工は図2のようにして行う
。即ち、波形壁(3)を有する金属管体(2) の中心
軸線(C) に対して略等間隔に複数個(図示実施例で
は3つ)の押えロール(4) を配設し、これら押えロ
ール(4) を径方向の外方より波形壁(3) の外側
頂部(3’)附近に当接し押えロールを転動しながら内
方へ押圧することにより波形壁(3) 、特にその外側
頂部(3’)附近を略U字状に集中して押圧することと
なり、前記押圧により該頂部附近に残留圧縮応力を生ぜ
しめ、且つ滑かな曲面を形成すると共に、波形壁(3)
の倒れや不等ピッチの矯正等も可能となるものである
。The next secondary processing is performed as shown in FIG. That is, a plurality of (three in the illustrated embodiment) presser rolls (4) are arranged at approximately equal intervals with respect to the central axis (C) of a metal tube (2) having a corrugated wall (3). The presser roll (4) is brought into contact with the vicinity of the outer apex (3') of the corrugated wall (3) from the outside in the radial direction, and the presser roll is rolled and pressed inward to remove the corrugated wall (3), especially the corrugated wall (3). The area near the outer top (3') is concentrated in a substantially U-shape, and the pressure generates residual compressive stress near the top, forming a smooth curved surface, and forming a corrugated wall (3).
It is also possible to correct tilting and uneven pitches.
【0009】尚、図示実施例では断面U字状の波形壁を
形成を示したが、断面Ω字状の波形壁も同様な効果をも
って本発明により製造することができる。Although the illustrated embodiment shows the formation of a wavy wall with a U-shaped cross section, a wavy wall with an Ω-shaped cross section can also be manufactured according to the present invention with the same effect.
【0010】0010
【発明の効果】以上説明したように本発明によれば、特
に波形壁(3) の頂部(3’)附近において、径方向
の外方より複数の押えロールにより該頂部附近を転動押
圧して、該頂部附近で圧縮方向への残留応力を生ぜしめ
、従って機械的強度を増すことができ、製品として例え
曲げ方向への無理な接続下にあっても頂部(3’)附近
での耐疲労強度、特に圧縮状態での使用時における疲労
強度を高め、長期に亘って亀裂、破損を軽減、防止する
ことができると共に、頂部附近を滑かな曲面に形成し、
更に波形壁の倒れや不等ピッチの矯正等も可能となる極
めて有用な蛇腹管及びその製造方法である。As explained above, according to the present invention, especially in the vicinity of the top (3') of the corrugated wall (3), a plurality of presser rolls roll and press the vicinity of the top from the outside in the radial direction. This creates a residual stress in the compressive direction near the top, thus increasing the mechanical strength, and the product has high durability near the top (3') even if it is forced to connect in the bending direction. It increases the fatigue strength, especially when used in a compressed state, and reduces and prevents cracks and breakage over a long period of time.It also has a smooth curved surface near the top.
Furthermore, it is an extremely useful bellows tube and its manufacturing method that can correct the collapse of corrugated walls and uneven pitches.
【図1】本発明の実施例を示す蛇腹管の一部切欠き平面
図である。FIG. 1 is a partially cutaway plan view of a bellows tube showing an embodiment of the present invention.
【図2】本発明の蛇腹管の製造方法を示す横断説明図で
ある。FIG. 2 is a cross-sectional explanatory view showing the method for manufacturing a bellows tube of the present invention.
【図3】従来例を示す蛇腹管の一部切欠き平面図である
。FIG. 3 is a partially cutaway plan view of a bellows tube showing a conventional example.
2 金属管材 3 波形壁 3′ 頂部 4 押えロール 2 Metal pipe material 3. Corrugated wall 3' Top 4 Presser roll
Claims (2)
形壁を有してなる蛇腹管において、前記各波形壁(3)
の外側頂部(3’)附近に圧縮応力を残留せしめたこ
とを特徴とする蛇腹管。Claim 1. In a bellows tube having a corrugated wall along the circumferential surface of a metal pipe material, each of the corrugated walls (3)
A bellows tube characterized in that compressive stress remains near the outer top (3') of the bellows tube.
的に膨出して形成された蛇腹管の前記波形壁の頂部附近
を、蛇腹管(2) の中心軸線(C) に対して略等間
隔に配設された複数の押えロールを用いて径方向の外方
より転動押圧して構成することを特徴とする蛇腹管の製
造方法。2. The vicinity of the top of the corrugated walls of a bellows tube formed by partially protruding a plurality of corrugated walls on the circumferential surface of a metal pipe material with respect to the central axis (C) of the bellows tube (2). 1. A method for manufacturing a bellows tube, comprising rolling and pressing from the outside in the radial direction using a plurality of press rolls arranged at approximately equal intervals.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP03128680A JP3098057B2 (en) | 1991-05-01 | 1991-05-01 | Bellows tube and manufacturing method thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP03128680A JP3098057B2 (en) | 1991-05-01 | 1991-05-01 | Bellows tube and manufacturing method thereof |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04331884A true JPH04331884A (en) | 1992-11-19 |
JP3098057B2 JP3098057B2 (en) | 2000-10-10 |
Family
ID=14990785
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP03128680A Expired - Fee Related JP3098057B2 (en) | 1991-05-01 | 1991-05-01 | Bellows tube and manufacturing method thereof |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3098057B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO328726B1 (en) * | 2008-08-14 | 2010-05-03 | Roxar Flow Measurement As | Connector housing |
-
1991
- 1991-05-01 JP JP03128680A patent/JP3098057B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP3098057B2 (en) | 2000-10-10 |
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