JPS6025207B2 - Manufacturing method of double bent pipe - Google Patents
Manufacturing method of double bent pipeInfo
- Publication number
- JPS6025207B2 JPS6025207B2 JP12818576A JP12818576A JPS6025207B2 JP S6025207 B2 JPS6025207 B2 JP S6025207B2 JP 12818576 A JP12818576 A JP 12818576A JP 12818576 A JP12818576 A JP 12818576A JP S6025207 B2 JPS6025207 B2 JP S6025207B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- double
- bending
- bent
- concentrically
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 21
- 238000005452 bending Methods 0.000 claims description 66
- 238000000034 method Methods 0.000 claims description 34
- 238000010438 heat treatment Methods 0.000 claims description 26
- 125000006850 spacer group Chemical group 0.000 claims description 5
- 239000011295 pitch Substances 0.000 claims description 2
- 238000013003 hot bending Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 235000006732 Torreya nucifera Nutrition 0.000 description 1
- 244000111306 Torreya nucifera Species 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Landscapes
- Branch Pipes, Bends, And The Like (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Description
【発明の詳細な説明】
本発明は直径の異なる２本の直管を同０若し〈は略向け
こなるように配して曲げた二重曲管を製造する方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a double curved pipe in which two straight pipes having different diameters are arranged and bent in the same direction or substantially in opposite directions.
二重曲管は石油等の危険物の貯蔵基地や移送ラインでの
配管に用いたり、二重管式の熱交換器やジャケット保温
管等に用いることで知られているが、従釆の二重曲管は
製造方法に難があり、また当該製造方法を探る故に二重
曲管の構造或は形状に関して実用上難点のあることが指
摘されている。Double curved pipes are known for being used for piping in storage bases and transfer lines for hazardous materials such as oil, as well as for double pipe heat exchangers and jacket heat retention pipes. Double-bent pipes have difficulties in the manufacturing method, and it has been pointed out that there are practical difficulties in the structure or shape of double-bent pipes in search of the manufacturing method.
即ち、従来の二重曲管は、第１図に示すように、二重曲
管の曲率を定めるための断面樋状をした円形状の案内溝
Ｃ，と曲げられるべき管の先端側を把持するクランプＣ
とを周上に具備して回動自在に配設した円盤状の曲げ型
○と、該曲げ型Ｄの上方に配設する断面樋状の案内溝○
２を具備した圧力型Ｐとから成る装置を用い、直径の大
きな外管Ｐ，内に小蚤の内管Ｐ２を挿入し、両替の空隙
部にそれらを同心的に保つための外芯金○を、また内管
Ｐ２内には曲げによる偏平化を防ぐための内芯金１をれ
ぞれ挿装した後、その先端側を前記装置のクランプＣで
緊縮し、曲げ型Ｄを強大なトルクで時計方向に回動させ
ると共に、圧力型Ｐを前記曲げ型Ｄの回動中心側に押圧
し乍ら、前記両芯金１，０がすべり摩擦に抗して常に管
Ｐ，，Ｐ２の曲がり部分より後方に在るようにして、即
ち、両芯金１，０を抜き乍ら製造されている。That is, as shown in Fig. 1, the conventional double-bent pipe has a circular guide groove C with a gutter-like cross section for determining the curvature of the double-bend pipe, and a guide groove C that grips the distal end of the pipe to be bent. Clamp C
A disc-shaped bending mold ○ is provided on the circumference and is rotatably arranged, and a guide groove ○ having a gutter-like cross section is arranged above the bending mold D.
Using a device consisting of a pressure type P equipped with 2, the inner tube P2 of a small flea is inserted into the outer tube P with a large diameter, and an outer core bar ○ is used to keep them concentrically in the exchange cavity. In addition, after inserting the inner core metal 1 into the inner tube P2 to prevent flattening due to bending, the tip side thereof is tightened with the clamp C of the device described above, and the bending mold D is applied with a strong torque. While rotating the bending die D in the clockwise direction and pressing the pressure die P toward the center of rotation of the bending die D, both the core metals 1 and 0 constantly bend the pipes P, P2 against sliding friction. It is manufactured so that it is located at the rear of the part, that is, both core metals 1 and 0 are removed.
然し乍ら、上記従来の製造方法は、曲げられるべき管Ｐ
，，Ｐ２の直径、肉厚及び曲げ半径が変る度に曲げ型Ｄ
並びに内、外芯金１，０を取り替えなければならないの
で、段取り工数が多くなるばかりでなく種々大きさの異
なる曲げ型や内、外芯金が必要となるため、実門性に欠
けるし、また、冷間での型曲げであるから、摩擦抵抗や
変形抵抗が大きく強大な駆動源を要する上に作業能率が
悪い等実用上諸々の難点があり、更に、この方法により
得られる二重曲管は、外管の曲警部が偏平していること
が多に上に、図示したような冷間での型曲げであるから
、大径の厚肉管による二重曲管の製造ができないことが
多い。However, in the above conventional manufacturing method, the pipe P to be bent is
,, bending type D every time the diameter, wall thickness, and bending radius of P2 change.
In addition, it is necessary to replace the inner and outer core metals 1 and 0, which not only increases the number of setup steps but also requires bending molds of various sizes and inner and outer core metals, which is not practical. Since mold bending is done in the cold, there are various practical difficulties such as high frictional resistance and deformation resistance, the need for a powerful drive source, and poor work efficiency. In addition to the fact that the curved part of the outer tube is often flat, it is also impossible to manufacture double-bent tubes using large-diameter, thick-walled tubes because the bending is done in cold conditions as shown in the figure. many.
そこで、従来は大径肉厚管による二重曲管の製造に際し
ては、外管と内管とをそれぞれ別個に同○半径に曲げ加
工した後、曲げた外管内に曲げた内管を挿袋するように
しているが、いずれかの管に直管部があると曲げた後の
内管を外管に挿入できないので、‘ィー 直管部のある
二重曲管の製造は不可能である、（ｏ｝ 直警部を有せ
ずしかも曲げ角度が内外両管同一の二重曲管は内外両替
の端部が同じ面位置になり、配管時他の二重直管との接
合作業に困難を伴う、し一 前記｛口｝の接合が出来て
も内外両管の接合部が重なり合っているので、例えば超
音波探傷法等により内外両管の各接合状態を検査するの
に不都合である、０ 前記‘ィ’で述べたように二重曲
管に直警部がないので、接合部に欠陥を発見した場合そ
の部分を切除して再接合すると曲管部が短かくなって曲
げ角度の不足をきたし、当該二重曲管は利用できなくな
る、等の難点があるのである。Therefore, conventionally, when manufacturing double-bent pipes using large-diameter thick-walled pipes, the outer pipe and inner pipe were bent separately to the same radius, and then the bent inner pipe was inserted into the bent outer pipe. However, if one of the tubes has a straight section, the bent inner tube cannot be inserted into the outer tube, so it is impossible to manufacture a double-bent tube with a straight section. Yes, (o) For double curved pipes that do not have a direct pipe and have the same bending angle for both the inner and outer pipes, the ends of the inner and outer ends are in the same plane, making it difficult to join with other double straight pipes during piping. Although it is difficult, even if the above-mentioned joint can be made, the joints of both the inner and outer pipes overlap, so it is inconvenient to inspect the state of each joint of the inner and outer pipes using, for example, ultrasonic flaw detection. , 0 As mentioned in 'A' above, double bent pipes do not have a direct inspection part, so if a defect is found in the joint, cutting out that part and rejoining will shorten the bent pipe and reduce the bending angle. There are drawbacks such as a shortage and the double-curved pipe becoming unusable.
本発明は従釆の一般的な二重曲管のような形状、構造上
の難点のない二重曲管を曲げ精度よく然も容易且つ抵廉
に製造する方法を提供することを目的としてなされたも
ので、その方法の構成は、適宜直径で適宜長さの直管に
よる外管の内部に、それより直径が小さく且つ長さの長
い直管を内管として挿入すると共に、前記外管の両端か
ら内管の両端部を適宜突出させて内外両管を同じ状に配
し、両替の両端部を機械的に支持した後、前記支持部分
を除き外管はその外側から内管はその内側からそれぞれ
適宜限定した幅で環状若しくは略環状に加熱できる手段
により曲げ加工すべき部分の先端側から加熱し始め、こ
れによる加熱帯域を内外両管の後端側に同時に移動させ
乍ら、該両加熱帯域に同時に曲げモーメントを与えるこ
とを特徴とするものである。The purpose of the present invention is to provide a method for easily and inexpensively manufacturing a double-bent pipe with good bending accuracy, without the problems in shape and structure of conventional double-bent pipes. The method consists of inserting a straight tube with a smaller diameter and longer length as an inner tube into an outer straight tube with an appropriate diameter and length, and Both ends of the inner tube are appropriately protruded from both ends, and both the inner and outer tubes are arranged in the same shape, and after mechanically supporting both ends of the exchange, the outer tube is moved from the outside to the inner tube, excluding the supporting portion. Then, heating is started from the tip side of the part to be bent using means capable of heating annularly or substantially annularly with appropriately limited widths, and the heating zone is simultaneously moved to the rear end side of both the inner and outer tubes. It is characterized by simultaneously applying a bending moment to the heating zone.
次に本発明の実施例を図に拠り説明する。Next, embodiments of the present invention will be described with reference to the drawings.
第２図は本発明方法により製造される二重曲管の一例を
示すもので、Ａは適宜直径、長さの外管１にそれより小
怪且つ長さの長い内管２をその両端部を外管１のそれか
ら突出させて同Ｄ状に挿入し、両替の両端側が直管部ｌ
ｂ，２ｂ、他が曲警部ｌａ，２ａとなるように曲げ加工
して得た二重曲管である。Fig. 2 shows an example of a double curved pipe manufactured by the method of the present invention. protrude from that of the outer tube 1 and insert it in the same D shape, so that both ends of the exchanger are in the straight tube portion l.
This is a double bent pipe obtained by bending so that b, 2b and the other parts are curved parts la and 2a.
而して、上記の曲げ加工に際し、本発明に於ては熱間曲
げを採用するので、本発明方法の説明に先立ち、熱間曲
げの原理について説明すれば次の通りである。Since hot bending is employed in the above bending process in the present invention, the principle of hot bending will be explained below before explaining the method of the present invention.
即ち、１本の直答を熱間で曲げ加工する方法として、高
周波誘導加熱のように局部加熱の可能な加熱手段を採用
して、前記直管の曲げ加工すべき部分を適宜限定した幅
で環状に加熱し、その加熱帯城を前記直管の長手方向に
移動し乍ら、当該加熱帯城に曲げモーメントを付与する
ことにより曲げ加工する方法がある。That is, as a method for hot bending a straight pipe, a heating means capable of local heating such as high-frequency induction heating is employed, and the portion of the straight pipe to be bent is suitably limited in width. There is a method of bending by heating annularly, moving the heating band in the longitudinal direction of the straight pipe, and applying a bending moment to the heating band.
この方法によれば、直管を精度高く所望の曲げ半径に曲
げ加工でき、この時の曲げ半径Ｒは管の直径、肉厚等を
問わず、Ｒ：器帯の式で表わされる。尚、前記式に於て
、船／ｄｔは前記加熱帯域が管の長手方向に移動する速
度、ｄａ／ｄｔは加熱帯城に於て与えられる曲げの角速
度であり、また、加熱帯城はこれを狭くすれば、管の曲
げ部分に偏平イロ現象が生じるのを防止することができ
る。従って、前記曲げ半径に関する式を満足する限り、
曲げ半径Ｒは常に所望の一定値にすることができるので
、二重曲管の製造に於ても外側の管と内側の管の両方を
同時に、前記の関係式を満足するように曲げ加工すれば
、所望の曲げ半径の二重曲管を自在に製造できることが
判る。According to this method, a straight pipe can be bent to a desired bending radius with high precision, and the bending radius R at this time is expressed by the equation where R: vessel diameter, regardless of the diameter, wall thickness, etc. of the pipe. Furthermore, in the above formula, the speed at which the heating zone moves in the longitudinal direction of the tube, da/dt is the angular velocity of bending given in the heating zone; By making it narrower, it is possible to prevent flattening from occurring at the bent portion of the tube. Therefore, as long as the equation regarding the bending radius is satisfied,
Since the bending radius R can always be set to a desired constant value, even in the production of double-curved pipes, both the outer pipe and the inner pipe must be bent at the same time so as to satisfy the above relational expression. For example, it can be seen that a double-curved pipe with a desired bending radius can be freely manufactured.
本発明方法は前記の原理を応用したもので、本発明方法
により二重曲管を製造するための装置をまず第３図に基
いて説明する。図に於て、３，４，３′，４′は外管１
と内管２に両端部を同Ｄ状に強固に把持するため、油圧
装置３ａ，４ａ，３を，４ａ′により開閉されるように
したクランプで、取附枠３ｂ，３ｂ′を介して腕５，５
′に摺動固定自在に配設されており、腕５はその下端側
が軸６により回動自在に支持されて曲げ腕として機能し
、他方の腕５′は上下端側を腕の長手方向に直角に敷設
した案内レール７，７に左右動自在に支持されて押し腕
として機能するようになっている。The method of the present invention is an application of the above-mentioned principle, and an apparatus for manufacturing a double curved pipe by the method of the present invention will first be explained with reference to FIG. In the figure, 3, 4, 3', 4' are outer tube 1
In order to securely hold both ends of the inner tube 2 in the same D shape, the hydraulic devices 3a, 4a, 3 are attached to the arms via the mounting frames 3b, 3b' using clamps that can be opened and closed by 4a'. 5,5
The lower end of the arm 5 is rotatably supported by a shaft 6 to function as a bending arm, and the other arm 5' is provided with its upper and lower ends extending in the longitudinal direction of the arm. It is supported so as to be able to move left and right on guide rails 7, 7 laid at right angles, so that it functions as a push arm.
即ち、曲げ腕５は軸６を中心に回動されることにより、
曲げ加工すべき両管１，２の曲げ半径を定め、押し腕５
′は図の右方へ移動させられることにより曲げ加工すべ
き両管１，２を前方へ送り出すように作動するため、曲
げ腕５の軸６の部分と、押し腕５′に於ける前記軸６に
相当する部分に設定した作用点８との間に、適宜の装置
（図示せず）により引張力Ｔ，Ｔを作用させ、クランプ
３，４，同３′，４′により同Ｄ的に支持された内外両
替１，２の加熱される部分に曲げモーメントが作用する
ようにしてある。而して、この内外両管１，２を加熱す
る手段は誘導加熱を利用するが、加熱用の誘導子を前記
の曲げ腕５の軸６を含むか若し〈は略含み且つクランプ
された内外両替１，２の軸線に直交する面内に在るよう
にするために、外管１を加熱する誘導子９は該管１の外
周側に、また内管２を加熱するための誘導子１０を該管
２の内周側にそれぞれ前記の条件で配設してある。ここ
で、誘導子９は適宜の支持手段（図示せず）によって図
示の位置に固定支持され、誘導子１川ま後端を固定した
支持村１０ａの先端に支持されるようになっていて、そ
れぞれ電源装置（図示せず）に接続されている。１１，
１２は両誘導子９，１０に設けた冷却液噴出用の冷却ノ
ズルで、誘導子９，１０の前方（図の右方）へ向け冷却
液を噴出し、誘導子９，１川こよる内外両管１，２の加
熱城の幅が必要以上に拡がらないようにして前記管１，
２が曲げられる際に偏平化するのを防止する。That is, by rotating the bending arm 5 around the axis 6,
Determine the bending radius of both pipes 1 and 2 to be bent, and press the push arm 5.
' is moved to the right in the figure to send forward both tubes 1 and 2 to be bent, so the axis 6 of the bending arm 5 and the axis of the pushing arm 5' A tensile force T, T is applied between the point of action 8 set at the part corresponding to 6 by an appropriate device (not shown), and the tension force is applied to the part D by clamps 3, 4, 3', 4'. A bending moment is applied to the heated portions of the supported internal and external exchanges 1 and 2. The means for heating both the inner and outer tubes 1 and 2 utilizes induction heating, and a heating inductor is provided that includes or substantially includes the shaft 6 of the bent arm 5 and is clamped. An inductor 9 for heating the outer tube 1 is placed on the outer circumferential side of the tube 1, and an inductor for heating the inner tube 2 is placed in a plane perpendicular to the axes of the exchangers 1 and 2. 10 are arranged on the inner peripheral side of the tube 2 under the conditions described above. Here, the inductor 9 is fixedly supported at the illustrated position by appropriate support means (not shown), and is supported at the tip of a support village 10a to which the rear end of the inductor 1 is fixed. Each is connected to a power supply (not shown). 11,
Reference numeral 12 denotes a cooling nozzle for spouting coolant provided on both inductors 9 and 10, which spouts the coolant toward the front of the inductors 9 and 10 (to the right in the figure), inside and outside the inductors 9 and 1. Said tubes 1 and 2 are heated so that the width of the heating castle of both tubes 1 and 2 does not expand more than necessary.
2 is prevented from flattening when bent.
１３は外管１内の内管２を正確に保持するため、殊に内
管２の操みを少なくするために外管１と内管２との隙間
に遊挿したスベーサであるが、このスベーサ１３は二重
に配した直管による内外両管１，２が前記曲げ装置の各
クランプ３，３′，４，４′に確実且つ強固に把持され
れば使用しなくてもよい。Reference numeral 13 denotes a spacer loosely inserted into the gap between the outer tube 1 and the inner tube 2 in order to accurately hold the inner tube 2 inside the outer tube 1, and in particular to reduce manipulation of the inner tube 2. The spacer 13 does not need to be used if both the inner and outer straight pipes 1 and 2, which are double-arranged straight pipes, are securely and firmly held by the respective clamps 3, 3', 4, and 4' of the bending device.
尚、図に於ては、管１，２の曲げ加工が進み、それらの
先端側（図の右方）にそれぞれ曲警部ｌａ，２ａが形成
されており、先端部は直管部ｌｂ，２ｂとなっている。
以上のように構成した装置に二重に配した直管による内
外両替１，２をセットし、譲導子９，１川こ電源電流を
供給し始めると共に冷却ノズル１１，１２を作動させ乍
ら、曲げ腕５の軸６と押し腕５′の作用点８の間に張引
力Ｔ，Ｔを作用させると、押し腕５′は当該引張力の作
用で前方（図の右方）へ進もうとし、この進み力を内外
両替１，２を介して受ける曲げ腕５は前記押し腕５′の
進みに相当する分だけ軸６を中心にして回動しようとし
て管１，２に曲げモーメントが作用することになる。In addition, in the figure, the bending process of the pipes 1 and 2 has progressed, and bent sections la and 2a are formed on their tip sides (right side of the figure), respectively, and straight pipe sections lb and 2b are formed at the tip ends. It becomes.
The internal and external exchangers 1 and 2 using double straight pipes are set in the device configured as described above, and the power supply current starts to be supplied to the power source 9 and 1, while the cooling nozzles 11 and 12 are operated. When tensile forces T and T are applied between the axis 6 of the bending arm 5 and the point of action 8 of the pushing arm 5', the pushing arm 5' moves forward (to the right in the figure) due to the action of the tensile force. The bending arm 5, which receives this advancing force via the inner and outer exchangers 1 and 2, tries to rotate about the shaft 6 by an amount corresponding to the advance of the pushing arm 5', and a bending moment acts on the tubes 1 and 2. I will do it.
一方、前記の曲げモーメントを受ける内外両替１，２は
誘導子９，１０によってそれらの配設されている近傍が
局部的に加熱され、その部分の組織が軟化しているので
、前記曲げモーメントによって管１，２は当該加熱部分
から曲がり始め、従って、この作業を連続すると、内外
両替１，２は先に述べた管の曲げに関する原理を満足し
乍ら二重曲管に形成されるものである。尚、上記の装置
の曲げ作業に於て、内外両管１，２は前後端部でクラン
ブ３，４，３′，４′により支持されているだけである
から、太さの異なる両管１，２に同一の曲げモーメント
が作用すると、榛み量が異なり、当該両替１，２の曲げ
半径が異ってくるようにも思われるが、これは第２図の
装置で太さの異なる管をそれぞれ別個に曲げる際、同一
の曲げモーメントで同一の半径に曲げるには誘導子の位
置を適宜調節すれば可能であることが判っているので、
この要領に基づいて誘導子９，１０の位置を適宜調節、
具体的には誘導子１０を譲導子９より若干前方へ位置さ
せる。このようにすれば、内外両替１，２の前後端部を
支持しただけで当該両替１，２に同一の曲げモーメント
が作用しても両替１，２は両一半径で曲げるのである。
以上は、第２図の装置によって本発明方法による二重曲
管を製造出来ることを説明したものであるが、本発明方
法による二重曲管は第３図に示す装置によっても製造可
能である。On the other hand, the inner/outlet exchangers 1 and 2 which are subjected to the bending moment are locally heated near where they are disposed by the inductors 9 and 10, and the structure of that part is softened. The tubes 1 and 2 begin to bend from the heated portion, so if this operation is continued, the inner and outer exchangers 1 and 2 will be formed into double curved tubes while satisfying the above-mentioned principle regarding tube bending. be. In addition, in the bending work of the above-mentioned device, since both the inner and outer tubes 1 and 2 are only supported by the clamps 3, 4, 3', and 4' at the front and rear ends, the two tubes 1 of different diameters are When the same bending moment acts on the exchangers 1 and 2, the amount of bending will be different, and the bending radii of the exchangers 1 and 2 will also be different. It is known that when bending each individually, it is possible to bend them to the same radius with the same bending moment by adjusting the position of the inductor appropriately.
Based on this procedure, adjust the positions of the inductors 9 and 10 as appropriate,
Specifically, the inductor 10 is positioned slightly forward of the inductor 9. In this way, even if the same bending moment acts on the exchangers 1 and 2 by simply supporting the front and rear ends of the exchangers 1 and 2, the exchangers 1 and 2 will be bent at the same radius.
The above has explained that the double-curved pipe according to the method of the present invention can be manufactured using the apparatus shown in FIG. 2, but the double-curved pipe according to the method according to the present invention can also be manufactured using the apparatus shown in FIG. 3. .
即ち、第３図の装置は従来公知の熱間曲げ装置を本発明
方法による二重曲管の製造に応用したもので、第２図の
装置に於ける押し腕５′と引張力装置とがない代わりに
、外管１の中程を曲げ腕５の形成する面内で支持する２
対のロール１４，１４′，１５，１５′と、当該両管１
，２を後端部で一体的に支持すると共に両替１，２を前
方へ送るための推力ＰＷ受ける支持手段１６とが設けて
あり、また、曲げ腕５のクランプとしては第３図の外管
用のクランブ４に相当するものを一個設けこれによって
内外両管１，２を支持するようにしてある。That is, the apparatus shown in FIG. 3 is an application of a conventionally known hot bending apparatus to the production of a double curved pipe according to the method of the present invention, and the push arm 5' and the tension device in the apparatus shown in FIG. Instead, the middle part of the outer tube 1 is supported within the plane formed by the bending arm 5.
Pairs of rolls 14, 14', 15, 15' and both pipes 1
, 2 at the rear end, and a support means 16 for receiving the thrust PW for sending the changers 1 and 2 forward.The clamp for the bending arm 5 is the one for the outer tube shown in FIG. One clamp 4 is provided to support both the inner and outer pipes 1 and 2.
この結果、内外両替１，２は、その前後機部で前記クラ
ンプ４、支持手段１６によって一体的に把持されるから
、両者を同心状に一体化するためのりング状のスベーサ
１３′，１３′が内外両替１，２による隙間の前後端部
に２個ずつ圧入してある。而して、同０状で二重に配設
した直管による内外両管１，２を第３図の装置で曲げる
ため、誘導子９，１０を作動させ乍ら冷却ノズル１１，
１２から冷却液を前方へ噴射して管１，２を狭い帯城で
局部的に加熱する一方、支持手段１６に推力ＰＷをかけ
て内外両替１，２を前方へ送り出し始めると、曲げ腕５
は管１，２の推進量に見合った角度分藤６を中心に回動
し始めて、両替１，２が曲げ始められる。As a result, the exchangers 1 and 2 are integrally held by the clamp 4 and the support means 16 at their front and rear parts, so ring-shaped spacers 13' and 13' are used to concentrically integrate the two. are press-fitted into the front and rear ends of the gap between the inner and outer exchangers 1 and 2. In order to bend both the inner and outer straight pipes 1 and 2, which are straight pipes arranged in a double shape in the same shape, using the device shown in FIG. 3, the cooling nozzles 11,
12 to locally heat the tubes 1 and 2 in a narrow band, while applying thrust PW to the support means 16 and starting to send the internal and external exchangers 1 and 2 forward, the bending arm 5
begins to rotate around the angle bracket 6 commensurate with the amount of thrust of the tubes 1 and 2, and the exchangers 1 and 2 begin to bend.
ここで、第４図の装置を管１，２の支持に関して考察す
ると、外管１は２対のロール１４，１４′，１５，１５
′に中程を支持され、両端を曲げ腕５のクランプ４と推
力ＰＷを受ける支持手段１６とに支持されるから、その
曲がりの態様は従来公知の熱間曲げの場合と同機である
が、内管２は両端がクランプ４と支持手段１６とに支持
されているだけで、外管１に於ける２対のロール１４，
１４′，１５，１５′に相当するものが無いから、両菅
１，２に同一の曲げモーメントが作用したとすれば、両
替１，２の太さの相違と相換って両管１，２の操み量に
差を生じ、当該両替１，２の曲げ半径が同一にならない
ようにも考えられるが、この場合も前記第２図の装置の
場合と同様に誘導子９，１０の位置を予め適宜調節して
おけば、内外両管１，２の曲げ半径を同一に維持できる
。Now, considering the apparatus shown in FIG. 4 in terms of supporting the tubes 1 and 2, the outer tube 1 has two pairs of rolls 14, 14', 15, 15
', and both ends are supported by the clamp 4 of the bending arm 5 and the support means 16 that receives the thrust PW, so the bending mode is the same as that of the conventional hot bending machine. The inner tube 2 is only supported at both ends by the clamp 4 and the support means 16, and the two pairs of rolls 14,
Since there is no equivalent to 14', 15, and 15', if the same bending moment acts on both tubes 1 and 2, the difference in thickness of exchangers 1 and 2 means that both tubes 1, It is also conceivable that the bending radii of the exchangers 1 and 2 may not be the same due to a difference in the amount of operation of the exchangers 2 and 2, but in this case as well, the positions of the inductors 9 and 10 may differ as in the case of the device shown in FIG. By adjusting appropriately in advance, the bending radii of both the inner and outer tubes 1 and 2 can be maintained the same.
従って、内外両管１，２を議導子９，１川こよつて局部
的に加熱し乍ら、支持手段１６を推進すれば、前記両管
１，２は同一半径で同時に曲げられて二重曲管に形成さ
れるのである。以上説明したように本発明による二重曲
管の製造法は、内外両替の両端部をクランブ等を以て強
固に把持して当該両管を予め同０状且つ一体的に支持し
ておき、曲管に形成すべき部分に、誘導加熱等による局
部加熱手段によって加熱帯城を連続的に移動する加熱を
施し乍ら、曲げモーメントを作用させるようにするから
、従来の製造法のように内外両管の同０位置を維持する
ための外芯金や内管の偏平を防止するための内芯金が下
要になって経済的であるばかりでなく、段取り工数を著
しく減少することができて作業の合理化を図ることがで
き、また熱間で曲げ作業を行なうので、従来の袷間曲げ
作業に比べ塑性変形抵抗が数分の一と小さくなる結果、
曲げ装置を小型、軽量に形成できて設備コストも安価に
なるなど、二重曲管の製造法として実用上幾多の効果を
奏する。Therefore, if both the inner and outer pipes 1 and 2 are locally heated by passing through the guides 9 and 1 and the supporting means 16 is propelled, both the pipes 1 and 2 are simultaneously bent at the same radius and doubled. It is formed into a curved pipe. As explained above, the method for manufacturing a double curved pipe according to the present invention is to firmly grasp both ends of the inner and outer exchanger with a clamp or the like to support both the pipes in the same shape and integrally in advance, and then This method uses a local heating means such as induction heating to continuously move a heating band on the part that is to be formed, while applying a bending moment. The outer core bar to maintain the same 0 position and the inner core bar to prevent the inner tube from flattening are required, which is not only economical, but also significantly reduces the number of setup steps. In addition, since the bending work is done hot, the plastic deformation resistance is reduced to a fraction of that of conventional bending work.
This method has many practical advantages as a method for manufacturing double-bent pipes, such as making the bending device smaller and lighter and reducing equipment costs.
一方、叙上のような製造法によって第５図乃至第１０図
のような種々の構造の二重曲管が得られるので、以下そ
れらについて説明する。On the other hand, double curved pipes having various structures as shown in FIGS. 5 to 10 can be obtained by the manufacturing method described above, and these will be explained below.
まず、第２図及び第５図、第６図に示す二重曲管は、先
に説明した第３図或は第４図の装置により得られたもの
で、内外両替１，２の両端部にそれぞれ直管部ｌｂ，２
ｂを有すると共に、内管２の直管部２ｂが外管１のその
部ｌｂから適宜量突出しているという構造上及び形状上
の特徴を具備している。First, the double-curved pipes shown in FIGS. 2, 5, and 6 are obtained by the apparatus shown in FIG. 3 or 4 described above. straight pipe parts lb, 2, respectively.
b, and has a structural and shape feature in that the straight pipe portion 2b of the inner tube 2 protrudes from that portion lb of the outer tube 1 by an appropriate amount.
これらの特徴は、図には表われないが第７図乃至第１０
図の二重曲管も具備している。而して、これらの二重曲
管は、曲管部ｌａ，２ａの両端に直管部ｌｂ，２ｂがあ
るので、該二重曲管と接続すべき他の二重曲管（図示せ
ず）と接合した後、接合部に除去すべき欠陥が発見され
た場合、当該部分を切除しても曲管部ｌａ，２ａの曲げ
角度に変化を生じることはないから、欠陥切除後の再接
合が可能となって、従来の直菅部のない二重曲管の接合
部に欠陥が発見された場合のように、該欠陥部を切除す
ると、曲管部の曲げ角度に変化を来たし、再使用ができ
なかったものに比で、極めて合理的に使用できる。また
、本発明方法により製造される二重曲管は、内管２の直
管部２ｂが外管１のそれｌｂより長く形成してあるから
、他の二重直管（図示せず）との接合作業が容易に行な
えるのみならず、内外両菅の接合部が重複しないので、
接合後の検査を容易且つ正確になし得る等の効果を奏し
、先の経済効果と併せ極めて実用性の高いものである。Although these features are not shown in the figures, they can be seen in Figures 7 to 10.
It is also equipped with the double bent pipe shown in the figure. Since these double curved pipes have straight pipe parts lb and 2b at both ends of the curved pipe parts la and 2a, other double curved pipes (not shown) to be connected to the double curved pipes are connected. ), if a defect that should be removed is found in the joint, cutting out the part will not change the bending angle of the bent pipe parts la and 2a, so rejoining after removing the defect is not necessary. Now, as in the case where a defect is discovered in the joint of a conventional double-bent pipe without a straight pipe part, if the defect is removed, the bending angle of the bent pipe part will change, and it will be necessary to repeat the process. It can be used very rationally compared to things that could not be used. In addition, since the straight pipe portion 2b of the inner pipe 2 is longer than that of the outer pipe 1, the double curved pipe manufactured by the method of the present invention is different from other double straight pipes (not shown). Not only can the joining work be done easily, but the joints of both the inner and outer tubes do not overlap, so
This has effects such as easy and accurate inspection after bonding, and in combination with the above-mentioned economical effects, it is extremely practical.
更に、本発明方法により製造される二重曲管は外管１と
内管２の間に形成される空隙に適宜リブ材を内管２の周
万向或は長手方向に設けてやれば、構造部材や熱交換器
として利用できる。Furthermore, in the double curved pipe manufactured by the method of the present invention, if appropriate rib members are provided in the gap formed between the outer pipe 1 and the inner pipe 2 around the circumference of the inner pipe 2 or in the longitudinal direction, It can be used as a structural member or heat exchanger.
例えば、第５図、第６図々示の二重曲管は曲げの際に要
したスベーサ１３′がそのまま内管周方向でのリブ材と
して機能し、第７図、第８図々示のものは、内管２の周
上に長手方向に亘るリブ材１７を４本配設して全体の強
度を高め構造部材として利用できるようにしたものであ
り、第９図々示のものは、リブ材１７を内管２の外周上
にフィン状に増設し熱交換器として利用できるようにし
てあるが、リブ材１７の数が増加すると、変形抵抗が著
しく大きくなって曲がり難くなるので、リブ材１７に切
込み１７ａを適宜ピッチで設けて曲げ加工性を改善した
ものである。第１０図々示のものも第９図のものと同様
に熱交換器として利用できる二重曲管であるが、ここで
は前記例のリブ材１７に代えて曲げ加工に影響の少ない
スタツド１８を内管２の外周面に多数立設してある。而
して、これらの二重曲管は内管２にリブ材１７やスタッ
ド１８が設けられるので、これらリブ材やスタッドを設
けないものに比べ曲げの際の変形抵抗が大きくなるが、
本発明方法は内外両替１，２の曲げるべき部分を、曲げ
の始端側から終端側に亘つて加熱帯城が移動するように
加熱し乍ら曲げる熱間曲げ加工であるから、前記変形抵
抗に拘わらず高い曲げ精度を保って比較的容易に曲げる
ことができる。For example, in the double bent pipe shown in FIGS. 5 and 6, the spacer 13' required for bending functions as a rib material in the circumferential direction of the inner pipe, and as shown in FIGS. 7 and 8. The inner pipe 2 has four rib members 17 extending in the longitudinal direction around the inner tube 2 to increase the overall strength and can be used as a structural member. Ribs 17 are added in the form of fins on the outer periphery of the inner tube 2 so that they can be used as a heat exchanger, but as the number of ribs 17 increases, the deformation resistance increases significantly and it becomes difficult to bend. Notches 17a are provided in the material 17 at appropriate pitches to improve bending workability. The one shown in Fig. 10 is also a double curved pipe that can be used as a heat exchanger like the one in Fig. 9, but here, instead of the rib material 17 of the previous example, studs 18 that have little effect on bending are used. A large number of them are erected on the outer peripheral surface of the inner tube 2. Since these double bent pipes are provided with rib members 17 and studs 18 on the inner pipe 2, the deformation resistance during bending is greater than those without these rib members or studs.
The method of the present invention is a hot bending process in which the parts of the inner and outer exchangers 1 and 2 to be bent are bent while being heated so that the heating band moves from the starting end to the ending end of the bending. However, it can be bent relatively easily while maintaining high bending accuracy.
本発明は以上の通りであって、本発明方法によれば、前
記二重曲管を高い曲げ精度で容易且つ低廉に製造できる
から、産業上極めて有用である。The present invention is as described above, and according to the method of the present invention, the double curved pipe can be easily and inexpensively manufactured with high bending accuracy, and is therefore extremely useful industrially.
第１図は従釆の二重曲管の製造装置を示す一部切戦平面
図、第２図は本発明方法により製造した二重曲管の一例
を示す一部切戦平面図、第３図は本発明方法を実施する
ための二重曲管製造装置の一例を示す横断平面図、第４
図は同じく別例の装置を示す横断平面図、第５図は本発
明方法により製造した二重曲管の別例を示す一部切教平
面図、第６図は第５図の正端面図、第７図は本発明方法
により製造した二重曲管の他の例を示す一部切教平面図
、第８図は第７図の正端面図、第９図、第１０図は本発
明方法により製造した二重曲管をそれぞれ熱交換器とし
て利用できるように構成した場合の一部を切開した平面
図である。
Ａ・・・・・・二重曲管、１・・・・・・外管、２・・
・・・・内管、ｌａ，２ａ……曲管部、ｌｂ，２ｂ……
直管部、３，３′，４，４′……クランプ、３ａ，３ａ
′，４ａ，４を・・・・・・油圧装置、３ｂ，３ｂ′・
・・・・・取附枠、５・・・・・・曲げ腕、５′・・・
…押し腕、６……軸、７・・・…案内レール、８…・・
・作用点、Ｔ・・・…張力、９，１０・・・…誘導子、
１１，１２・・…・冷却ノズル、１３，１３′……スベ
ーサ、１４，１４′，１５，１５′……ロール、１６・
・・…支持手段、ＰＷ…・・・推力、１７・・・…リブ
材、１７ａ・・…・切欠き、１８……スタツド。
孝Ｚ図
労２図
多）図
矛チ図
多５図
茅５図
多ァ図
劣り図
多９図
多 〆。Fig. 1 is a partially cut-away plan view showing an apparatus for manufacturing a double-bent pipe with a secondary structure; Fig. 2 is a partially cut-away plan view showing an example of a double-bend pipe manufactured by the method of the present invention; The figure is a cross-sectional plan view showing an example of a double-bent pipe manufacturing apparatus for carrying out the method of the present invention.
The figure is a cross-sectional plan view showing another example of the device, FIG. 5 is a partially cut-away plan view showing another example of the double curved pipe manufactured by the method of the present invention, and FIG. 6 is a front end view of FIG. 5. , FIG. 7 is a partially cutaway plan view showing another example of a double curved pipe manufactured by the method of the present invention, FIG. 8 is a front end view of FIG. 7, and FIGS. FIG. 3 is a partially cutaway plan view of the double curved tubes manufactured by the method, each of which is configured to be used as a heat exchanger. A...Double curved pipe, 1...Outer pipe, 2...
...Inner pipe, la, 2a...Bent pipe section, lb, 2b...
Straight pipe section, 3, 3', 4, 4'... Clamp, 3a, 3a
', 4a, 4... Hydraulic system, 3b, 3b'.
...Attachment frame, 5...Bent arm, 5'...
...Push arm, 6...Axis, 7...Guide rail, 8...
・Point of action, T...Tension, 9,10...Inductor,
11, 12... Cooling nozzle, 13, 13'... Subasa, 14, 14', 15, 15'... Roll, 16.
...Supporting means, PW...Thrust, 17...Rib material, 17a...Notch, 18...Stud. Takashi Z Zurou 2 Zuzu) Zukochi Zuzuzu 5zu Kaya 5zuzuazu Inferior zuzuzu 9zuzu 〆.
Claims (1)
れより直径が小さく且つ長さの長い直管を内管として挿
入すると共に、前記外管の両端から内管の両端部を適宜
突出させて内部両管を同心状若しくは略同心状に配して
そのままこれらの両端部を機械的に支持した後、前記支
持部分を除いて外管はその外側から内管はその内側から
それぞれ適宜限定した幅で環状若しくは略環状に加熱で
きる手段により曲げ加工すべき部分の先端側から加熱し
始め、この加熱による二つの加熱帯域を内外両管の後端
側に向つて同時に移動させ乍ら、二つの加熱帯域に同時
に曲げモーメントを与えることを特徴とする二重曲管の
製造方法。 ２ 内外両管を同心状若しくは略同心状に配して支持す
るのに際し、内外両管の各々の両端部をそれぞれ別個の
クランプにより支持することを特徴とする特許請求の範
囲第１項記載の二重曲管の製造方法。 ３ 内外両管を同心状若しくは略同心状に配して支持す
るのに際し、内外両管により形成される隙間に複数のリ
ブ又はリングによるスペーサを嵌入して当該両管を一体
化し、外管の両端部をクランプで支持することを特徴と
する特許請求の範囲第１項記載の二重曲管の製造方法。 ４ 内外両管を同心状若しくは略同心状に配して支持す
るのに際し、管の外周面上にこの径方向に向いた切込み
を適宜ピツチで有するリブ材、又は、多数のスタツドを
放射状に立設した内管を使用することを特徴とする特許
請求の範囲第１項記載の二重曲管の製造方法。[Scope of Claims] 1. A straight pipe with a suitable diameter and a suitable length is inserted into the inside of the outer pipe, and a straight pipe with a smaller diameter and longer length is inserted as an inner pipe, and the inner pipe is inserted from both ends of the outer pipe. After making both ends of the tube protrude as appropriate and arranging both inner tubes concentrically or approximately concentrically and mechanically supporting both ends, the outer tube is connected to the inner tube from the outside except for the supporting portion. starts heating from the tip side of the part to be bent using means capable of heating annularly or approximately annularly from the inside with appropriately limited widths, and directs the two heating zones toward the rear ends of both the inner and outer tubes. A method for manufacturing a double-bent pipe, characterized by applying a bending moment to two heating zones at the same time while simultaneously moving the pipe. 2. The invention according to claim 1, characterized in that when the inner and outer tubes are arranged and supported concentrically or substantially concentrically, both ends of each of the inner and outer tubes are supported by separate clamps. Method for manufacturing double bent pipes. 3. When arranging and supporting both the inner and outer tubes concentrically or approximately concentrically, a spacer made of a plurality of ribs or rings is inserted into the gap formed by the inner and outer tubes to integrate the two tubes, and the outer tube is 2. The method of manufacturing a double curved pipe according to claim 1, wherein both ends are supported by clamps. 4. When supporting both the inner and outer pipes by arranging them concentrically or approximately concentrically, rib members having radially oriented notches at appropriate pitches on the outer circumferential surface of the pipes, or a large number of studs standing radially are used. 2. A method for manufacturing a double-curved pipe according to claim 1, characterized in that a double-curved inner pipe is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12818576A JPS6025207B2 (en) | 1976-10-27 | 1976-10-27 | Manufacturing method of double bent pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12818576A JPS6025207B2 (en) | 1976-10-27 | 1976-10-27 | Manufacturing method of double bent pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5353565A JPS5353565A (en) | 1978-05-16 |
| JPS6025207B2 true JPS6025207B2 (en) | 1985-06-17 |
Family
ID=14978528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12818576A Expired JPS6025207B2 (en) | 1976-10-27 | 1976-10-27 | Manufacturing method of double bent pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6025207B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62150902A (en) * | 1985-12-25 | 1987-07-04 | Hitachi Ltd | Earth structure for microwave integrated circuit parts |
| JPS6330003U (en) * | 1986-08-08 | 1988-02-27 | ||
| KR102015246B1 (en) * | 2019-03-28 | 2019-08-27 | 방관수 | System for manufacturing linear type double insulation pipe and method for manufacturing linear type double insulation pipe using the same |
| JP2021058915A (en) * | 2019-10-08 | 2021-04-15 | 株式会社ユタカ技研 | Double pipe and method of manufacturing the same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110548788B (en) * | 2019-10-16 | 2020-08-21 | 西北工业大学 | Filling medium for assisting double-layer pipe bending forming |
-
1976
- 1976-10-27 JP JP12818576A patent/JPS6025207B2/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62150902A (en) * | 1985-12-25 | 1987-07-04 | Hitachi Ltd | Earth structure for microwave integrated circuit parts |
| JPS6330003U (en) * | 1986-08-08 | 1988-02-27 | ||
| KR102015246B1 (en) * | 2019-03-28 | 2019-08-27 | 방관수 | System for manufacturing linear type double insulation pipe and method for manufacturing linear type double insulation pipe using the same |
| JP2021058915A (en) * | 2019-10-08 | 2021-04-15 | 株式会社ユタカ技研 | Double pipe and method of manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5353565A (en) | 1978-05-16 |
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