JPS63235026A - Bending method for tube - Google Patents

Bending method for tube

Info

Publication number
JPS63235026A
JPS63235026A JP6954587A JP6954587A JPS63235026A JP S63235026 A JPS63235026 A JP S63235026A JP 6954587 A JP6954587 A JP 6954587A JP 6954587 A JP6954587 A JP 6954587A JP S63235026 A JPS63235026 A JP S63235026A
Authority
JP
Japan
Prior art keywords
tube
pipe
elastic tube
bending
bent
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
Application number
JP6954587A
Other languages
Japanese (ja)
Inventor
Toshihiro Imoto
利広 井本
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
Sumitomo Metal Industries Ltd
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 Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP6954587A priority Critical patent/JPS63235026A/en
Publication of JPS63235026A publication Critical patent/JPS63235026A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To restrain generation of sectional deformations and wrinkles and to improve the quality of bent products by inserting a flexible elastic tube into a predetermined bending part of a pipe to be bent and bending the pipe with an incompressible fluid pressurized to fill the elastic tube. CONSTITUTION:A pipe 3 is set on a fixing table 4 with a pressing die 2; a flexible elastic tube 8 which is freely expansible in the radial direction and is provided with a blocking member blocks axial elongation is inserted into the predetermined bending part of the pipe 3 with the tube 8 being in a contracted condition. Then, the tube 8 is filled with an incompressible fluid from an introduction pipe 11 so that the tube 8 is in contact with the inner surface of the predetermined part. Next, a rotation table 6 is turned and the tube 8 is moved in proportion to the turning of the table 6. The predetermined bending part of the pipe 3 is bent along a die 5 by the turning of the table 6 and tends to be flat, but the tendency is restrained from the inside of the pipe 3 by the tube 8 and axial elongation of the pipe 3 is also restrained by the elongation blocking member.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、曲げ部に断面変形やしわが発生するのを抑え
つつ管を曲げ加工する方法に関し、特にUベント管の加
工に好適な方法に関する。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for bending a pipe while suppressing cross-sectional deformation and wrinkles in the bent portion, and is particularly suitable for processing U-bent pipes. Regarding.

〔従来の技術〕[Conventional technology]

管の曲げ加工において、曲げ部の断面変形やしわの発生
を抑えるには、−Sに芯金が用いられる。
In pipe bending, a metal core is used for -S in order to suppress cross-sectional deformation and wrinkles in the bent portion.

芯金は多種多様なものが知られているが、Uベント管へ
適用可能なもはそれほど多くなく(プラグタイプ、フオ
ームタイプ、ボールタイプ、チェーブタイブ等が公知で
ある。
Although a wide variety of core metals are known, there are not so many that can be applied to U-bent pipes (plug type, form type, ball type, chevron type, etc. are known).

プラグタイプの芯金は、第4図(イ)に示されるように
、管の曲げ加工部位の手前を管内より支え、フオームタ
イプのものは、(ロ)に示されるように、曲げ加工部位
とその手前を部分的に支える。これに対し、実開昭58
−157220号公報等に見られるボールタイプは、(
ハ)に示されるように、軸方向で分割され可撓性を与え
られた芯金で、曲げ予定部の全体に予め挿入され、曲げ
加工部位のみならず加工後の曲げ部も支承するようにし
たものである。同様にチューブタイプも、に)に示され
るように、空気を圧入した弾性チューブにより曲げ加工
部の全体を支承し、特開昭56−105825号公報等
に記載されている。
As shown in Figure 4 (a), the plug type core metal supports the front of the bending part of the pipe from inside the pipe, and the form type core supports the bending part and the part as shown in (b). Partially support the front of it. On the other hand,
The ball type seen in -157220 etc. is (
As shown in c), the core metal is divided in the axial direction and given flexibility, and is inserted in advance into the entire area to be bent, so that it supports not only the bending part but also the bent part after processing. This is what I did. Similarly, the tube type, as shown in 2), supports the entire bent portion by an elastic tube into which air is pressurized, and is described in Japanese Patent Application Laid-Open No. 56-105825.

しかるに、これらのいずれの芯金を使用しても断面変形
やしわの発生を十分に抑えることはできない。
However, no matter which of these core metals is used, cross-sectional deformation and wrinkles cannot be sufficiently suppressed.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

給水ヒータ、蒸気発生器、熱交換器等に使用されるステ
ンレス鋼等の管においては、例えばT(肉厚)/D(外
径)が0.1以下の薄肉材で、R(曲げ半径)/Dが5
以下の苛酷なUバフ1部に、楕円率6%以下というよう
な極めて厳しい寸法仕様が設定され、しかもしわは−切
あってはならないとされている。
Stainless steel pipes used in feed water heaters, steam generators, heat exchangers, etc. are thin-walled materials with T (thickness)/D (outer diameter) of 0.1 or less, and R (bending radius). /D is 5
Extremely strict dimensional specifications such as an ellipticity of 6% or less are set for the following 1 part of the severe U buff, and wrinkles must not be cut.

プラグタイプ、フオームタイプを使用する曲げ加工方法
では、曲げ加工部位近傍を局部的にしか規制できないた
め、このような高水準の仕様を満足させることは到底不
可能であり、ボールタイプの芯金を用いる方法も、曲げ
部の外側に芯金形状に対応して波を打ったような凹凸変
形が生じ、不適である。ポールタイプの芯金は更に、管
とのすき間が少ないため、Uベンド管にあっては装入、
取り外しが難しいという作業上の問題もある。また、弾
性チューブを用いる方法は、チューブの装入、取り外し
が容易というだけで、曲げ加工中にはチューブが著しく
断面変形し、さしたる効果は見られない。
With bending methods that use plug types and form types, it is impossible to satisfy such high specifications because the area around the bending area can only be controlled locally. The method used is also unsuitable because it causes undulating deformation on the outside of the bent portion corresponding to the shape of the core metal. Furthermore, since the pole type core metal has less clearance with the pipe, it is difficult to charge and
There is also an operational problem in that it is difficult to remove. Further, in the method using an elastic tube, although it is easy to insert and remove the tube, the tube undergoes significant cross-sectional deformation during bending, and is not very effective.

本発明は、斯かる問題点を全て解決した作業性良好で、
既述の高水準の仕様も十分に満足させ得る管の曲げ加工
方法を堤供するものである。
The present invention solves all of these problems and has good workability.
The present invention provides a pipe bending method that fully satisfies the high-level specifications mentioned above.

〔問題点を解決するための手段〕[Means for solving problems]

既述の弾性チューブは、収縮させた状態で曲げ予定部に
挿入し、圧入空気により膨張させて曲げ部の変形を抑え
た後、再度収縮させることにより曲げ部から容易に抜き
出すことができる。しかし、曲げ部の断面変形を完全に
抑えることは難しい。
The above-described elastic tube can be inserted in a contracted state into a portion to be bent, inflated with pressurized air to suppress deformation of the bent portion, and then contracted again to be easily pulled out from the bent portion. However, it is difficult to completely suppress cross-sectional deformation of the bent portion.

これは、曲げ加工による変形力によってチューブ内の圧
入空気が収縮すること、チューブが軸方向に伸長するこ
との2点に原因のあることが、本発明者らの調査により
判明した。
The inventors' investigation has revealed that this is caused by two factors: the compressed air in the tube contracts due to the deformation force caused by the bending process, and the tube stretches in the axial direction.

すなわち、従来の弾性チューブを用いる方法では、弾性
チューブに十分な剛性を与え、その上でチューブ内に十
分な圧力の空気を注入すれば、曲げ部の断面変形は抑制
される傾向を強める。しかし、このときでも、圧入空気
の収縮は阻止し得ないし、何といっても、チューブの可
撓性、伸縮性といった優位性が失われてしまう。逆に可
撓性、伸縮性等の優位性を残したときは、圧入空気の収
縮の他にチューブが軸方向に伸長し、著しい断面縮少が
生じるのである。
That is, in the conventional method using an elastic tube, if sufficient rigidity is given to the elastic tube and air under sufficient pressure is injected into the tube, the cross-sectional deformation of the bent portion tends to be suppressed. However, even in this case, the contraction of the pressurized air cannot be prevented, and above all, the advantages of the tube, such as its flexibility and elasticity, are lost. On the other hand, when advantages such as flexibility and stretchability are retained, the tube expands in the axial direction in addition to the contraction of the compressed air, resulting in a significant reduction in cross section.

本発明は、斯かる知見を基礎に、弾性チューブの可撓性
、伸縮性等の優位性を残したまま、その断面縮少を抑え
、曲げ部の断面変形防止に成功したもので、その要旨と
するところは、第1図および第2図に示されている如く
、管3の曲げ予定部に、径方向に伸縮可能で軸方向に鋼
線等の伸長阻止部材9を備えた可撓性の弾性チ二−ブ8
を挿入し、チューブ8内に水、油等の非圧縮性流体を圧
入した状態で曲げ加工を行うことを特徴とする管の曲げ
加工方法にある。
Based on this knowledge, the present invention has succeeded in suppressing the cross-sectional reduction and preventing cross-sectional deformation of the bent portion while retaining the advantages of elastic tubes such as flexibility and stretchability. As shown in FIGS. 1 and 2, a flexible tube 3 is provided with an extension preventing member 9 such as a steel wire in the radial direction and axially extending and contracting at the portion where the pipe 3 is to be bent. elastic tube 8
The method of bending a tube is characterized in that the bending process is performed in a state in which an incompressible fluid such as water or oil is pressurized into the tube 8.

〔作  用〕[For production]

弾性チ二−ブ8は径方向の膨張、収縮が許容され、可撓
性を有しているので、曲げ予定部への挿入および曲げ部
からの取り外しが容易である。
Since the elastic tube 8 is allowed to expand and contract in the radial direction and has flexibility, it can be easily inserted into and removed from the bending area.

曲げ加工中は、弾性チューブ8内の圧入流体に圧縮が生
じず、また弾性チューブ8の軸方向の伸長が伸長阻止部
材9により阻止されるので、弾性チューブ8に断面収縮
が生じず、曲げ部を内側から全面的に拘束し、曲げ部の
断面変形、しわが防止される。
During the bending process, the press-fit fluid in the elastic tube 8 is not compressed, and the elastic tube 8 is prevented from expanding in the axial direction by the expansion prevention member 9. Therefore, the elastic tube 8 does not undergo cross-sectional contraction, and the bending portion is completely restrained from the inside, preventing cross-sectional deformation and wrinkles at the bent part.

〔実施例〕〔Example〕

本発明の方法の具体例を回転引き曲げについて説明する
A specific example of the method of the present invention will be explained regarding rotational drawing bending.

回転引き曲げに使用する加工機を第1図を参照して説明
すると、本体1に固定された固定テーブル4に被加工管
3が押え型2により、軸方向移動を許容した状態で装着
される。一方、本体1に取り付けた曲げ型5の周囲を回
転テーブル6が、締付は型7により管3を固定して回転
する。
A processing machine used for rotary drawing and bending will be described with reference to FIG. 1. A pipe to be processed 3 is mounted on a fixed table 4 fixed to a main body 1 by a presser die 2 while allowing axial movement. . On the other hand, a rotary table 6 rotates around a bending die 5 attached to the main body 1, with the tube 3 fixed by a die 7 for tightening.

弾性チューブ8は、第2図(イ)(ロ)に詳示されるよ
うに、先端が閉塞され尾端が開放されたウレタンゴム、
天然ゴム製等の中空袋で、ゴム内に伸長阻止部材として
2本の鋼線9をU字形に弯曲させ周方向で近接して軸方
向に埋め込んだものとなっている0弾性チューブ80尾
端は金属製の継手10を介して非圧縮性液体の導入管1
)に接続される。
As shown in detail in FIGS. 2(a) and 2(b), the elastic tube 8 is made of urethane rubber whose tip is closed and whose tail is open.
A hollow bag made of natural rubber or the like, in which two steel wires 9 are curved into a U-shape and embedded in the axial direction close to each other in the circumferential direction as expansion prevention members inside the rubber. is an incompressible liquid introduction pipe 1 via a metal joint 10
).

m線9は弾性チューブ8の伸長阻止を確実ならしめるた
めに、端部を継手lOに係止させている。
In order to ensure that the elastic tube 8 is prevented from elongating, the end of the m-line 9 is locked in a joint 1O.

弾性チューブ8の先端においては、鋼線9が弧状に弯曲
しているもので、径方向の伸縮を阻害することは殆どな
い。
At the tip of the elastic tube 8, the steel wire 9 is curved in an arc shape, so that expansion and contraction in the radial direction is hardly inhibited.

弾性チューブ8の長さは、管3の曲げ部全体を拘束する
意味から、曲げ部の長さより長くすることが望まれる。
The length of the elastic tube 8 is desirably longer than the length of the bent portion in order to restrain the entire bent portion of the tube 3.

外径は、管3への挿入および管3からの取り外しを容易
ならしめるために、径方向に収縮した状態で管3の内径
より1fi程度以上小さくする。また、膨張時に管3の
曲げ部を内側から拘束するために、無拘束で径方向に膨
張させたときには、管3の内径より大きくなることが必
要である0弾性チューブ8の径方向の伸縮率は、この2
点を満足するように決定される。
The outer diameter is about 1 fi or more smaller than the inner diameter of the tube 3 in a radially contracted state in order to facilitate insertion into and removal from the tube 3. In addition, in order to constrain the bent portion of the tube 3 from the inside during expansion, the radial expansion/contraction rate of the elastic tube 8 is required to be larger than the inner diameter of the tube 3 when expanded in the radial direction without restraint. This 2
It is determined that the points are satisfied.

弾性チューブ8の材質、厚みおよび鋼線9の材質、直径
、本数は、与えられた管3の仕様および曲げ仕様のもと
で、径方向の伸縮性と、収縮時の可撓性と、必要な耐力
とが確保されるよう、適宜設定される。
The material and thickness of the elastic tube 8 and the material, diameter, and number of the steel wires 9 are determined based on the radial stretchability, flexibility when contracted, and necessary under the given specifications and bending specifications of the tube 3. It is set as appropriate to ensure a sufficient proof strength.

例えば、管3が外径22.23m、肉厚1.27鶴の5
US304管で、曲げ半径が33.5 mの場合、弾性
チューブ8の材質をウレタンゴム、鋼線9をピアノ線と
すれば、ゴムの厚みは、3〜5重自、鋼線の直径は0.
5〜2龍、本数は2〜4本が適当である。
For example, pipe 3 has an outer diameter of 22.23 m and a wall thickness of 1.27 mm.
In the case of a US304 pipe with a bending radius of 33.5 m, if the material of the elastic tube 8 is urethane rubber and the steel wire 9 is piano wire, the thickness of the rubber is 3 to 5 mm, and the diameter of the steel wire is 0. ..
5 to 2 dragons, and the appropriate number is 2 to 4.

この仕様に依れば、収縮時に十分な可撓性が確保され、
かつチューブ8内に非圧縮性流体を圧入したときにはチ
ューブ外径が3〜5fi拡大し、収縮時に管3の内面と
の間に1〜2flの直径差を確保しても、膨張時に管3
を内側から確実に拘束できる。
According to this specification, sufficient flexibility is ensured during contraction,
In addition, when an incompressible fluid is pressurized into the tube 8, the outer diameter of the tube expands by 3 to 5 fi, and even if a diameter difference of 1 to 2 fl is secured between the tube and the inner surface of the tube when it contracts, the tube 3 expands when it expands.
can be securely restrained from the inside.

非圧縮性流体としては主に水、油等の液体を使用する。As the incompressible fluid, liquids such as water and oil are mainly used.

非圧縮性流体の注入圧入は、弾性チューブ8を管3の内
面に圧接させるまで拡径できる圧力が確保できればよく
、弾性チューブ8の仕様に応じて適宜設定され°るもの
である。
Injecting and press-fitting the incompressible fluid only needs to ensure a pressure that can expand the diameter of the elastic tube 8 until it comes into pressure contact with the inner surface of the tube 3, and is set appropriately according to the specifications of the elastic tube 8.

第2図に示す弾性チューブ8を使用して管3の曲げ加工
を行う手順を第1図により詳しく説明する。
The procedure for bending the tube 3 using the elastic tube 8 shown in FIG. 2 will be explained in detail with reference to FIG. 1.

先ず、第1図(イ)に示されるように、管3を押え型2
により固定テーブル4に装着するとともに、その曲げ予
定部の先の部分を締付は型7により回転テーブル6に固
定し、曲げ予定部には弾性チューブ8を鋼線9が曲げ中
立線位置に対向するように位置決めし、収縮状態で挿入
する。
First, as shown in FIG.
At the same time, the tip of the part to be bent is fixed to the rotary table 6 by the mold 7, and the elastic tube 8 is attached to the part to be bent, and the steel wire 9 is opposed to the bending neutral line position. Position it as shown and insert it in the contracted state.

次に、弾性チューブ8に導入管1)より非圧縮性流体を
圧入し、弾性チューブ8を曲げ予定部内面に圧接させた
後、第2図(ロ)四に示すように、回転テーブル6を回
転させ、かつ回転に合せて弾性チューブ8を移動させる
Next, incompressible fluid is pressurized into the elastic tube 8 through the introduction tube 1), and after the elastic tube 8 is brought into pressure contact with the inner surface of the portion to be bent, the rotary table 6 is moved as shown in FIG. The elastic tube 8 is rotated and moved in accordance with the rotation.

回転テーブル6の回転により管3の曲げ予定部が曲げ型
5に沿って弯曲させられる。このとき、曲げ予定部は偏
平化しようとするが、内側から弾性チューブ8にて規制
される0弾性チューブ8は、前述したとおり、圧入流体
の収縮がなく、軸方向の伸長も鋼線9により阻止され、
断面収縮がないので、上記偏平化はほぼ完全に阻止され
る。
By rotating the rotary table 6, the portion of the tube 3 to be bent is curved along the bending die 5. At this time, the part to be bent tries to flatten, but as mentioned above, the elastic tube 8, which is regulated from the inside by the elastic tube 8, has no contraction of the press-fit fluid, and the axial expansion is also caused by the steel wire 9. blocked,
Since there is no cross-sectional shrinkage, the above-mentioned flattening is almost completely prevented.

曲げ加工が終了すると、弾性チューブ8内の圧入流体の
圧力を解放する。これにより、弾性チューブ8は管3と
の間にクリアランスを生じ、また可撓性をとりもどすこ
とから、管3から容易に抜き取ることができる。
When the bending process is completed, the pressure of the press-fitting fluid in the elastic tube 8 is released. This creates a clearance between the elastic tube 8 and the tube 3 and restores flexibility, so that the elastic tube 8 can be easily extracted from the tube 3.

管3から弾性チューブ8を抜き取ると、管3を加工機か
ら取り外す。
When the elastic tube 8 is extracted from the tube 3, the tube 3 is removed from the processing machine.

本発明例として、直径(D)22.23m、肉厚(t)
1.27nのSUS 304管を既述の手順により曲げ
半径(R)33.5酊、55.7 tm、88.24f
l、120.78mの4種類にUベンド加工した。
As an example of the present invention, the diameter (D) is 22.23 m, the wall thickness (t)
A 1.27n SUS 304 tube was bent with a radius (R) of 33.5mm, 55.7tm, and 88.24f according to the procedure described above.
The U-bend was processed into four types: 1, 120.78 m.

使用した弾性チューブは収縮時外径18.51m。The elastic tube used had an outer diameter of 18.51 m when contracted.

肉厚5■會のウレタンゴム製で、鋼線は直径1fiのピ
アノ線2本をU型にしてゴム内に埋込んだ、非圧縮性流
体は石油系作動油を用い、注入圧力は1Okr/rug
とした。無拘束でこの圧力を付与することにより弾性チ
ューブは外径約22酊となる。
It is made of urethane rubber with a wall thickness of 5 mm, and the steel wires are two piano wires with a diameter of 1 fi and are embedded in the rubber in a U shape. Petroleum-based hydraulic oil is used as the incompressible fluid, and the injection pressure is 1 Okr/ rug
And so. By applying this pressure without restraint, the elastic tube has an outer diameter of about 22 mm.

また比較のために、第4図(ロ)に示すフオームタイプ
の芯金と、同図に)に示す従来チューブとを使用して同
一の曲げ加工を行った。従来チューブは上記弾性チュー
ブにおいて綱線は使わず、注入流体は空気を上記と同じ
圧力で注入するものとした。
For comparison, the same bending process was performed using the form-type core bar shown in FIG. 4(B) and the conventional tube shown in FIG. 4(B). In the conventional tube, no cable wire was used in the above-mentioned elastic tube, and air was injected as the injection fluid at the same pressure as above.

曲げ部の楕円率を測定した結果を第3図に示す。Figure 3 shows the results of measuring the ellipticity of the bent portion.

図中の破線は許容楕円率を示すものである。The broken line in the figure indicates the allowable ellipticity.

第3図から明らかなように、フオームタイプの芯金を使
用する従来例にあっては、R/D=5程度の比較的緩や
かなりベンド加工にあっても楕円率が4%を超え、R/
D−4,5程度より小さくなると要求仕様を満足できな
くなり、更にR/D=2程度の苛酷なUベンド加工にあ
っては楕円率が10%を超える上に曲げ部内側にしわが
生じ、製品価値を完全に失った。
As is clear from Fig. 3, in the conventional example using a form-type core metal, the ellipticity exceeds 4% even in a relatively gentle bending process with R/D = 5, and the R /
If D is smaller than about 4.5, the required specifications cannot be met, and furthermore, in severe U-bend processing with R/D = 2, the ellipticity exceeds 10% and wrinkles occur on the inside of the bend, resulting in poor product quality. It has completely lost its value.

また、従来チューブを使用する例にあっては楕円率が要
求仕様を全く満足せず、またR/D=5程度でしわが発
生し、芯金を用いる効果が得られなかった。
Furthermore, in the case of using conventional tubes, the ellipticity did not meet the required specifications at all, and wrinkles occurred at R/D=5 or so, so that the effect of using a metal core could not be obtained.

これに対し、本発明例は上記従来例のいずれと比較して
も楕円率が大巾に抑制され、R/D値に関係なく要求仕
様を満足し、しわの発生も一切認められなかった。
In contrast, in the examples of the present invention, the ellipticity was greatly suppressed compared to any of the conventional examples, the required specifications were satisfied regardless of the R/D value, and no wrinkles were observed.

〔発明の効果〕〔Effect of the invention〕

以上の説明から明らかなように、本発明の曲げ加工方法
は、苛酷なUベンド加工に適用して曲げ部の断面変形や
しわの発生を効果的に抑え、これにより加工品の品質向
上に大きな効果を発揮するとともに、作業性良好で加工
能率を低下させる危惧がなく、プラグタイプの芯金を使
用する場合と比べれば、むしろ加工能率を向上させるこ
とができる。
As is clear from the above explanation, the bending method of the present invention can be applied to severe U-bend processing to effectively suppress cross-sectional deformation and wrinkles at the bent portion, thereby significantly improving the quality of processed products. In addition to being effective, it has good workability and there is no risk of reducing machining efficiency, and compared to the case of using a plug-type core metal, it can actually improve machining efficiency.

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

第1図(イ)〜(へ)は本発明の方法における手順を回
転引き曲げの場合について例示した模式図、第2図(イ
)および(ロ)は本発明の方法に使用する弾性チューブ
の構造を例示する縦断側面図および縦断正面図、第3図
は本発明の方法を実施したときの楕円率を従来方法の場
合と比較して示したグラフ、第4図(イ)〜に)は従来
の曲げ加工方法を示す模式図である。 図中、3:管、8:弾性チューブ、9:伸長阻止部材(
鋼線)。 5巳舟訳
Figures 1 (a) to (f) are schematic diagrams illustrating the procedure of the method of the present invention in the case of rotary drawing and bending, and Figures 2 (a) and (b) are diagrams of the elastic tube used in the method of the present invention. A longitudinal side view and a longitudinal front view illustrating the structure, Fig. 3 is a graph showing the ellipticity when the method of the present invention is implemented in comparison with that of the conventional method, and Fig. 4 (a) to 4) are FIG. 2 is a schematic diagram showing a conventional bending method. In the figure, 3: tube, 8: elastic tube, 9: extension prevention member (
steel wire). 5 Mifune translation

Claims (1)

【特許請求の範囲】[Claims] (1)管(3)の曲げ予定部に径方向に伸縮可能で軸方
向に伸長阻止部材(9)を備えた可撓性の弾性チューブ
(8)を挿入し、該チューブ(8)内に非圧縮性流体を
圧入した状態で曲げ加工を行うことを特徴とする管の曲
げ加工方法。
(1) Insert a flexible elastic tube (8) that is expandable and contractible in the radial direction and equipped with an expansion prevention member (9) in the axial direction into the portion of the tube (3) to be bent, and insert it into the tube (8). A method for bending a pipe, characterized in that bending is performed while an incompressible fluid is pressurized.
JP6954587A 1987-03-23 1987-03-23 Bending method for tube Pending JPS63235026A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6954587A JPS63235026A (en) 1987-03-23 1987-03-23 Bending method for tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6954587A JPS63235026A (en) 1987-03-23 1987-03-23 Bending method for tube

Publications (1)

Publication Number Publication Date
JPS63235026A true JPS63235026A (en) 1988-09-30

Family

ID=13405794

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6954587A Pending JPS63235026A (en) 1987-03-23 1987-03-23 Bending method for tube

Country Status (1)

Country Link
JP (1) JPS63235026A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010007501A1 (en) * 2010-02-11 2011-08-11 J. Eberspächer GmbH & Co. KG, 73730 Pipe stabilization device i.e. hydraulic bending arbor, for stabilization of bending portion of e.g. round pipe during bending operation for transformation of pipe, has end section including flexible hollow body containing pressurized fluid
FR3058653A1 (en) * 2016-11-15 2018-05-18 Stelia Aerospace BENDING MACHINE HAVING AN INFLATABLE CHUCK AND METHOD OF BENDING

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010007501A1 (en) * 2010-02-11 2011-08-11 J. Eberspächer GmbH & Co. KG, 73730 Pipe stabilization device i.e. hydraulic bending arbor, for stabilization of bending portion of e.g. round pipe during bending operation for transformation of pipe, has end section including flexible hollow body containing pressurized fluid
DE102010007501B4 (en) * 2010-02-11 2021-07-15 Eberspächer Exhaust Technology GmbH & Co. KG Pipe stabilizer and bending method using the pipe stabilizer
FR3058653A1 (en) * 2016-11-15 2018-05-18 Stelia Aerospace BENDING MACHINE HAVING AN INFLATABLE CHUCK AND METHOD OF BENDING

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