JP2562175B2 - Pipe bender - Google Patents
Pipe benderInfo
- Publication number
- JP2562175B2 JP2562175B2 JP63130713A JP13071388A JP2562175B2 JP 2562175 B2 JP2562175 B2 JP 2562175B2 JP 63130713 A JP63130713 A JP 63130713A JP 13071388 A JP13071388 A JP 13071388A JP 2562175 B2 JP2562175 B2 JP 2562175B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- tubular body
- bending
- wire
- processed
- 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.)
- Expired - Fee Related
Links
Landscapes
- Bending Of Plates, Rods, And Pipes (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、パイプ曲げ具に関する。TECHNICAL FIELD The present invention relates to a pipe bending tool.
従来のパイプ曲げ具は、第４図に示すように、被加工
パイプ（３）を受止める一対の受止め部材（４），
（４）を設け、受止め部材（４），（４）に受止められ
た被加工パイプ（３）に対して遠近方向に移動操作自在
なベンディングシュー（５）を設けたものや、第５図に
示すように、断面円形状の線材（１）を螺旋巻きして被
加工パイプ（３）に外嵌自在な筒状体（２）を形成して
あるもの等があり、いずれも、被加工パイプ（３）の曲
げ時に曲げ外力が被加工パイプ（３）の一部に集中して
折れ曲がったり、円形のパイプ断面形状がつぶれてしま
ったりしない様に、被加工パイプ（３）の長手方向に対
する接触支持長さを大きくして曲げ外力を分散させた
り、被加工パイプ（３）の周方向に対する接触長さを大
きくして、断面形状を保形してあった。As shown in FIG. 4, the conventional pipe bending tool has a pair of receiving members (4) for receiving the pipe (3) to be processed.
(4) is provided with a bending shoe (5) that is movable in the perspective direction with respect to the pipe to be processed (3) received by the receiving members (4) and (4); As shown in the figure, there is a wire rod (1) having a circular cross section which is spirally wound to form a tubular body (2) which can be fitted onto a pipe (3) to be processed. When bending the processing pipe (3), the bending external force is not concentrated on a part of the processing pipe (3) and is not bent, or the circular pipe cross-sectional shape is not crushed. In order to disperse the bending external force by increasing the contact supporting length with respect to, or to increase the contact length in the circumferential direction of the pipe to be processed (3), the cross-sectional shape was maintained.
しかし、例えば外周部に軟質の樹脂等の被覆層を形成
してあるパイプを上記従来の手段を用いて曲げ加工する
場合、その被覆層に対する前記外嵌自在な筒状体（２）
或いはベンディングシュー（５）の接触面積が大きく、
パイプ曲げ時にパイプ曲げ具と被覆層との摩擦によっ
て、被覆層が破損したり、被覆層に加わる外力によっ
て、被覆層が圧潰したりしてパイプの破損を招くという
問題があった。However, for example, when a pipe having a coating layer of a soft resin or the like formed on the outer periphery thereof is bent using the above-mentioned conventional means, the tubular body (2) which can be fitted onto the coating layer is freely fitted.
Or the contact area of the bending shoe (5) is large,
When the pipe is bent, there is a problem that the coating layer is damaged by friction between the pipe bending tool and the coating layer, or the coating layer is crushed by an external force applied to the coating layer, resulting in damage to the pipe.
そこで、被覆層を損傷しないように、前記線材（１）
を螺旋巻きした筒状体（２）を、被加工パイプ（３）に
内嵌して、筒状体（２）に対して曲げ外力を加えて被加
工パイプ（３）の内面側から曲げ外力を長手方向に分散
させると共に、内面を支持することが考えられるが、こ
の場合、パイプ曲げ加工の際にパイプが座屈して断面形
状の変形に伴って筒状体（２）の周部が被加工パイプ
（３）に挟圧されるために、パイプ曲げ加工後に筒状体
（２）を被加工パイプ（３）からその端部を強く引張っ
て引き抜くと塑性変形してしまって再使用に対する障害
となるという問題があった。Therefore, the wire (1) is provided so as not to damage the coating layer.
A cylindrical body (2) spirally wound on the pipe (3) is fitted into the pipe (3), and an external bending force is applied to the pipe (2) to bend the pipe (3) from the inner surface side. It is conceivable that the pipes are dispersed in the longitudinal direction and the inner surface is supported. In this case, when the pipe is bent, the pipe buckles and the peripheral portion of the tubular body (2) is covered by the deformation of the cross-sectional shape. Since the tubular body (2) is pinched by the processed pipe (3) and after the pipe is bent, the tubular body (2) is plastically deformed when its end is strongly pulled out from the pipe to be processed (3), which is an obstacle to reuse. There was a problem that became.
本発明の目的は、パイプを損傷せずにパイプを曲げる
ことができるようにしながら、その用具をパイプからの
取外し後に再使用ができるようにする点にある。It is an object of the present invention to allow the pipe to be bent without damaging it while allowing the tool to be reused after removal from the pipe.
本発明のパイプ曲げ具の第１特徴構成は、超弾性を有
する形状記憶合金に線材を、螺旋巻きして筒状体を形成
し、前記線材の断面形状を、前記筒状体の直径方向への
曲げ外力に対する断面二次モーメントが、前記筒状体の
長手方向への曲げ外力に対する断面二次モーメントより
も大きな形状にしてあることにあり、さらに、その第２
特徴構成は、第１特徴構成における線材のAf変態点を常
温以下の温度に設定してあることにあり、その作用・効
果は次の通りである。A first characteristic configuration of a pipe bending tool of the present invention is that a wire rod is spirally wound around a shape memory alloy having superelasticity to form a tubular body, and a cross-sectional shape of the wire rod is changed in a diameter direction of the tubular body. The second moment of area with respect to the external bending force is larger than the second moment of area with respect to the external bending force of the cylindrical body in the longitudinal direction.
The characteristic constitution is that the Af transformation point of the wire rod in the first characteristic constitution is set to a temperature equal to or lower than room temperature, and its action and effect are as follows.
つまり、本発明の第１特徴構成においては、筒状体を
形成する線材は、超弾性を有する形状記憶合金から成っ
ているために、被加工パイプの外周部を損傷しないよう
に、筒状体を被加工パイプに内嵌させて曲げ加工した場
合に、前記線材のAf変態点以上の温度の下では、周知の
如く、線材に変形に伴う金属結晶内でのすべりが生じな
い限り、超弾性現象を発現し、加工変形能が高くなる
が、常温付近においては温度が高くなるに伴って、結晶
内弾性変形領域が大きくなり、見掛け上の降伏応力が高
くなる。しかも、前記線材の断面形状を、前記筒状体の
縮径をもたらす曲げ外力に対する断面二次モーメント
が、前記筒状体の長手方向への曲げ外力に対する断面二
次モーメントよりも大きな形状にしてあることにより、
前記筒状体の曲げ外力に対する変形抵抗を低く維持しな
がら、前記被加工パイプに対する曲げ外力を減殺するこ
となく、かつ、前記被加工パイプの断面変形を阻止する
のである。つまり、前記被加工パイプの断面変形に伴っ
て前記線材に及ぼされる歪みは、前記筒状体の曲げに伴
って前記線材に及ぼされる歪みに比して小さく維持さ
れ、前記線材が超弾性を有しておりながら、前記被加工
パイプの断面変形に伴って前記線材に及ぼされる歪みは
前記線材の弾性変形領域内に維持され、前記被加工パイ
プの断面変形を阻止するように前記被加工パイプの内側
から前記被加工パイプの断面形状を維持するように支持
することが可能である。殊に、前記被加工パイプの外周
面を保護しようとする場合には、前記被加工パイプに対
する曲げ加工外力を前記筒状体に加えれば、前記外周面
に直接外力を加えることなく、前記被加工パイプの内面
側から曲げ外力を加えることが可能である。That is, in the first characteristic configuration of the present invention, the wire forming the tubular body is made of a shape memory alloy having superelasticity, so that the tubular body is prevented from damaging the outer peripheral portion of the pipe to be processed. In the case where the wire is fitted into the pipe to be processed and bent, under the temperature above the Af transformation point of the wire rod, as is well known, unless the wire rod is slipped in the metal crystal due to deformation, superelasticity Although the phenomenon is manifested and the work deformability becomes high, the elastic deformation region in the crystal becomes larger and the apparent yield stress becomes higher as the temperature rises near room temperature. Moreover, the cross-sectional shape of the wire is such that the second moment of area for the bending external force that causes the diameter reduction of the tubular body is larger than the second moment of area for the bending external force in the longitudinal direction of the tubular body. By
The deformation resistance to the bending external force of the tubular body is kept low, the bending external force to the pipe to be processed is not reduced, and the cross-sectional deformation of the pipe to be processed is prevented. That is, the strain exerted on the wire rod due to the cross-sectional deformation of the pipe to be processed is kept smaller than the strain exerted on the wire rod due to the bending of the tubular body, and the wire rod has superelasticity. However, the strain exerted on the wire rod due to the cross-sectional deformation of the pipe to be processed is maintained within the elastic deformation region of the wire rod, and the strain of the pipe to be processed is prevented so as to prevent the cross-sectional deformation of the pipe to be processed. It is possible to support from the inside so as to maintain the cross-sectional shape of the pipe to be processed. Particularly, when it is desired to protect the outer peripheral surface of the pipe to be processed, a bending external force to the pipe to be processed is applied to the tubular body without directly applying an external force to the outer peripheral surface. Bending external force can be applied from the inner surface side of the pipe.
さらに、前記線材のAf変態点以下の温度の形状記憶領
域下では、温度の低下に伴って、超弾性変形領域が拡大
し、それに伴って、前記線材の見掛け上の降伏応力は低
くなり、たとえ筒状体の周部が被加工パイプによって強
く挟圧されたとしても、その端部を引張るだけで擬組成
変形、即ち超弾性変形によって容易に延びて縮径した状
態でパイプの外方に取出すことができ、パイプの内面を
傷つけるおそれもない。そして、取出し後は、前記線材
のAf変態点以上の温度に加温することによって、再び元
の筒状体に形状復帰する。Furthermore, under the shape memory region at a temperature below the Af transformation point of the wire, the superelastic deformation region expands as the temperature decreases, and along with that, the apparent yield stress of the wire decreases, Even if the peripheral portion of the tubular body is strongly pinched by the pipe to be processed, it is taken out of the pipe in a state where it is easily extended and contracted by pseudo-compositional deformation, that is, superelastic deformation, just by pulling the end portion. The inner surface of the pipe is not damaged. Then, after taking out, the shape is restored to the original tubular body again by heating to a temperature equal to or higher than the Af transformation point of the wire.
殊に、本発明の第２特徴構成のようにすれば、前記被
加工パイプを常温で曲げ加工すれば前記Af変態点以上の
温度下で加工できるので、前記筒状体は前記被加工パイ
プの変形に抗する支持力は充分に備えており、前記曲げ
加工に際して温度調整が必要なく、前記筒状体の取出し
に際しては、前記Af変態点以下の温度に冷却することで
容易に前記筒状体を引き抜くことができるようになる。In particular, according to the second characteristic configuration of the present invention, if the pipe to be processed is bent at room temperature, the pipe can be processed at a temperature equal to or higher than the Af transformation point. It has sufficient supporting force against deformation, temperature adjustment is not required during the bending process, and when the tubular body is taken out, the tubular body can be easily cooled by cooling to a temperature below the Af transformation point. You will be able to pull out.
従って、上記パイプ曲げ具によって、例えば、パイプ
の外周部が軟質材で被覆されたものであっても、その外
周部を損傷せずに、しかも、パイプに曲げ外力を加えた
際に座屈によってパイプが折れ曲がったり断面変形する
ことを抑制して加工できながら、曲げ加工後のパイプか
らの取外しも容易で、しかも再使用でき、作業性の向上
及び加工コストの低減が可能になった。Therefore, by the pipe bending tool, for example, even if the outer peripheral portion of the pipe is covered with a soft material, the outer peripheral portion is not damaged, and due to buckling when an external bending force is applied to the pipe. While the pipe can be processed while suppressing bending and cross-section deformation, it can be easily removed from the pipe after bending and can be reused, improving workability and reducing the processing cost.
次に、本発明の実施例を、図面に基づいて説明する。 Next, an embodiment of the present invention will be described with reference to the drawings.
第１図乃至第３図に示すように、超弾性を有する形状
記憶合金の線材（１）を、間隔をあけずに螺旋巻きして
筒状体（２）を形成し、線材（１）の断面形状を、第３
図に示すように、筒状体（２）の長手方向よりも径方向
における長さが大になるようにほぼ長方形に形成して軟
質の金属パイプに対するパイプ曲げ具を構成してある。As shown in FIGS. 1 to 3, a shape-memory alloy wire rod (1) having superelasticity is spirally wound without a gap to form a tubular body (2). The cross-sectional shape is
As shown in the figure, a pipe bending tool for a soft metal pipe is formed by forming the tubular body (2) into a substantially rectangular shape so that its length in the radial direction is larger than that in the longitudinal direction.
前記線材（１）は、Ni−Ti系の形状記憶合金を、変態
温度が常温（−20℃〜40℃）以下になるように加工し
て、常温では、低ヤング率の弾性変形領域が極めて大き
い超弾性を示すように形成してある。The wire (1) is formed by processing a Ni-Ti-based shape memory alloy so that the transformation temperature is equal to or lower than room temperature (-20 ° C to 40 ° C). It is formed so as to exhibit great superelasticity.
尚、前記筒状体（２）の先端部（2A）は、先端側ほど
小径になるように形成してパイプ（３）に内嵌しやすい
ように構成してある。The distal end portion (2A) of the tubular body (2) is formed to have a smaller diameter toward the distal end side so that it can be easily fitted into the pipe (3).
そして、前記パイプ曲げ具を使用するには、被加工用
パイプ（３）に筒状体（２）を曲げ加工位置まで内嵌挿
入（第１図）した後、第２図に示すように、筒状体
（２）をパイプ曲げ応力に対する分散部材として、パイ
プ（３）の曲げ加工位置の両側を、夫々手で把持してパ
イプ（３）を弯曲状に曲げ、パイプ（３）の曲げ加工後
は、パイプ（３）曲げ加工部の断面形状が多少変形し
て、筒状体（２）の外周部を、パイプ（３）が挟圧して
いたとしても、筒状体（２）を引張れば、線材（１）の
超弾性によって筒状体（２）がその長手方向に容易に伸
長しながら縮径して、パイプ（３）内から筒状体（２）
は引き抜かれ、パイプ（３）外で再び元の形に弾性復帰
する。Then, in order to use the pipe bending tool, after inserting the tubular body (2) into the pipe for processing (3) up to the bending position (FIG. 1), as shown in FIG. Bending the pipe (3) by bending the pipe (3) into a curved shape by gripping the pipe (3) on both sides of the bending position with a hand by using the tubular body (2) as a dispersion member for the pipe bending stress. After that, even if the cross-sectional shape of the bent portion of the pipe (3) is slightly deformed and the outer peripheral portion of the tubular body (2) is pinched by the pipe (3), the tubular body (2) is pulled. Then, due to the superelasticity of the wire (1), the tubular body (2) easily expands in its longitudinal direction and contracts in diameter, so that the tubular body (2) comes out of the pipe (3).
Is withdrawn and returns elastically to its original shape outside the pipe (3).
前記線材（１）は、Ni−Ti合金以外に他の合金から成
る形状記憶合金であっても良い。The wire (1) may be a shape memory alloy made of another alloy other than the Ni-Ti alloy.
前記線材（１）の断面形状は、長方形以外に、長円形
又は、楕円形等の形であっても良く、つまり、筒状体
（２）の直径方向への曲げ外力に対する断面二次モーメ
ントが、筒状体（２）の長手方向への曲げ外力に対する
断面二次モーメントよりも大きな形状にして、径方向に
加わる応力に対する支持力を高めると共に、筒状体
（２）の長手方向に加える張力に対して弾性変形しやす
くしてあれば良い。The cross-sectional shape of the wire (1) may be oval or elliptical in addition to rectangular, that is, the second moment of area against the bending external force of the tubular body (2) in the diametrical direction. , A tensile force applied in the longitudinal direction of the tubular body (2) while increasing the supporting force against the stress applied in the radial direction by making the tubular body (2) into a shape larger than the second moment of area against the external bending force in the longitudinal direction. On the other hand, it is sufficient if it is easily elastically deformed.
図面は本発明に係るパイプ曲げ具の実施例を示し、第１
図及び第２図は夫々作用説明図、第３図は筒状体の一部
拡大断面図、第４図及び第５図は夫々従来のパイプ曲げ
具である。 （１）……線材、（２）……筒状体。The drawings show an embodiment of a pipe bending tool according to the present invention.
FIG. 2 and FIG. 2 are explanatory views of the operation, FIG. 3 is a partially enlarged sectional view of a tubular body, and FIG. 4 and FIG. 5 are conventional pipe bending tools. (1) ... Wire rod, (2) ... Cylindrical body.
Claims (2)
を、螺旋巻きして筒状体（２）を形成し、前記線材
（１）の断面形状を、前記筒状体（２）の直径方向への
曲げ外力に対する断面二次モーメントが、前記筒状体
（２）の長手方向への曲げ外力に対する断面二次モーメ
ントよりも大きな形状にしてあるパイプ曲げ具。1. A wire of a shape memory alloy having superelasticity (1)
Is spirally wound to form a tubular body (2), and the sectional shape of the wire (1) is the second moment of area with respect to the bending external force of the tubular body (2) in the diametrical direction. A pipe bending tool having a shape larger than a second moment of area against an external bending force of the body (2) in the longitudinal direction.
度に設定してある請求項１記載のパイプ曲げ具。2. The pipe bending tool according to claim 1, wherein the Af transformation point of the wire (1) is set to a temperature below room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63130713A JP2562175B2 (en) | 1988-05-27 | 1988-05-27 | Pipe bender |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63130713A JP2562175B2 (en) | 1988-05-27 | 1988-05-27 | Pipe bender |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01299716A JPH01299716A (en) | 1989-12-04 |
| JP2562175B2 true JP2562175B2 (en) | 1996-12-11 |
Family
ID=15040843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63130713A Expired - Fee Related JP2562175B2 (en) | 1988-05-27 | 1988-05-27 | Pipe bender |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2562175B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103949515A (en) * | 2014-04-25 | 2014-07-30 | 哈尔滨飞机工业集团有限责任公司 | Spiral tube winding method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103722059A (en) * | 2013-11-12 | 2014-04-16 | 周曙君 | Push bending forming method for preventing plastic instability of ultra-thin wall metal bend |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5728631A (en) * | 1980-07-29 | 1982-02-16 | Nisshin Steel Co Ltd | Bending work of thin walled metallic pipe |
| JPS6039518B2 (en) * | 1980-09-30 | 1985-09-06 | ファナック株式会社 | Industrial robot wrist mechanism |
-
1988
- 1988-05-27 JP JP63130713A patent/JP2562175B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103949515A (en) * | 2014-04-25 | 2014-07-30 | 哈尔滨飞机工业集团有限责任公司 | Spiral tube winding method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01299716A (en) | 1989-12-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |