JPS5950934A - Manufacture of heat exchanging tube - Google Patents
Manufacture of heat exchanging tubeInfo
- Publication number
- JPS5950934A JPS5950934A JP16051282A JP16051282A JPS5950934A JP S5950934 A JPS5950934 A JP S5950934A JP 16051282 A JP16051282 A JP 16051282A JP 16051282 A JP16051282 A JP 16051282A JP S5950934 A JPS5950934 A JP S5950934A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- fin
- welding
- edge
- fins
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/22—Making finned or ribbed tubes by fixing strip or like material to tubes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
【発明の詳細な説明】 この発明は熱交換管の製造方法に関する。[Detailed description of the invention] The present invention relates to a method of manufacturing a heat exchange tube.
従来、この種方法として、溶接縁を管材の外周半径に一
致する曲率半径の円弧状とした多数のフィンを製造し、
これらの中から一組のフィンを取り出し、これらフィン
で管材を挾むかたちで溶接縁を管材に密着圧接しつつ、
抵抗溶接機等により溶接縁及びそれが圧接する管材部分
を溶融させて、フィンを管材に溶着し、上記の作業を繰
り返して、管材の長手方向にフィンを取付けて熱交換管
を製造する方法は知られている。しかし乍ら、前記従来
方法には次の如き欠点があった。第1に、フィンの溶接
縁全面が溶接前において管材に密着する形状となされて
いるため、換言すれば、溶接縁と管材との接触面積が大
きいため、フィンを管材に押し付ける圧力を大きくしな
いと単位面積当りの圧力が小さくなり、そのため溶着不
良部分が生じるという欠点があった。第2に抵抗溶接機
を使用して溶接を行なう場合、溶接縁と管材との接触面
積が大きいため、それらを溶着させるには大電流を必要
として不経済であると共に大電流を発生することの出来
る高価な溶接機を必要とするという欠点があった。第3
に、溶接開始時から溶接完了時まで、即ち、溶接が完了
するまで、溶接縁と管利との接触面積が一定であるため
、部分的に過剰溶着が起こることが多く、その結果、溶
接歪が生じることも多いという欠点があった。Conventionally, this type of method involves manufacturing a large number of fins with arcuate weld edges having a radius of curvature that matches the outer radius of the pipe material.
Take out a set of fins from among these, sandwich the pipe material with these fins, and press the welding edge tightly against the pipe material.
There is a method for manufacturing heat exchange tubes by melting the welded edge and the part of the pipe material that it presses with a resistance welder, etc., welding the fins to the pipe material, and repeating the above steps to attach the fins in the longitudinal direction of the pipe material. Are known. However, the conventional method has the following drawbacks. First, since the entire surface of the welded edge of the fin is shaped to be in close contact with the pipe material before welding, in other words, the contact area between the welded edge and the pipe material is large, so it is necessary to increase the pressure to press the fin against the pipe material. There was a drawback that the pressure per unit area was small, resulting in areas with poor welding. Second, when welding using a resistance welding machine, the contact area between the weld edge and the pipe material is large, so a large current is required to weld them together, which is uneconomical and generates a large current. The drawback is that it requires an expensive welding machine. Third
In addition, since the contact area between the weld edge and pipework remains constant from the start of welding to the completion of welding, excessive welding often occurs in some areas, resulting in welding distortion. The disadvantage is that it often occurs.
この発明は、フィンの溶接縁を管材の外周半径に近似す
るけれどもそれとは一致しない曲率半径の円弧状とし、
この溶接縁を管材に圧接しつつ溶融させて溶接縁を管材
の外周面に沿う形状に変形させて、フィンを管材に溶着
するようにして、上記欠点を一掃した熱交換管の製造方
法を提供するものである。In this invention, the welded edge of the fin is made into an arc shape with a radius of curvature that approximates but does not match the outer radius of the pipe material,
To provide a method for manufacturing a heat exchange tube that eliminates the above drawbacks by melting the welded edge while pressurizing it to the tube material, deforming the welded edge into a shape that follows the outer peripheral surface of the tube material, and welding the fins to the tube material. It is something to do.
以丁に、この発明の第1実施例を第1図乃至第3図を参
照しつつ説明する。A first embodiment of the present invention will now be described with reference to FIGS. 1 to 3.
一般鋼やステンレス鋼・耐蝕鋼等の特殊鋼等、要するに
抵抗溶接可能な板材から多数のフィン1を打ち抜き等の
手段により製造する。各フィン1の形状は、斜辺中央部
に円弧状の溶接縁2を有する直角二等辺三角形であり、
前記溶接縁2は、管材3の外周半径Rよりもやや大きな
曲率半径R′を有する円弧状となされている。また、溶
接鰍2の両終端角部各々を切除くことにより切除部4が
フィン1に形成されている。A large number of fins 1 are manufactured by punching or other means from a plate material that can be resistance welded, such as general steel or special steel such as stainless steel or corrosion-resistant steel. The shape of each fin 1 is a right-angled isosceles triangle having an arcuate welded edge 2 at the center of the hypotenuse,
The welding edge 2 has an arcuate shape with a radius of curvature R' that is slightly larger than the outer radius R of the tube material 3. Further, a cutout portion 4 is formed in the fin 1 by cutting off both end corner portions of the welding rib 2.
なお、フィン1の形状は直角二等辺三角形に限られるも
のではない。Note that the shape of the fin 1 is not limited to a right-angled isosceles triangle.
このようにして製造したフィン1の中から一組のフィン
1.1を取り出しこれらフィン1.1により管材3を挾
むかたちで、フィン1.1の溶接縁2.2を管材3に圧
接しつつ、抵抗溶接機等を利用して、溶接縁2.2及び
それらか当接する管材3の部分を溶融させ、溶接縁2.
2を管材3の外周面に沿う形状に変形させて、フィン1
.1の斜辺間に間隔5をあけるようにして、フィン1.
1を管材3に溶着する。なお、溶接縁2.2及びそれら
が当接する管材3の部分を溶融させる手段は、蕎周波溶
接機等でもよいことは勿論である。A set of fins 1.1 are taken out of the fins 1 manufactured in this manner, and the welded edges 2.2 of the fins 1.1 are pressed against the pipe material 3, with the pipe material 3 being sandwiched between these fins 1.1. At the same time, using a resistance welding machine or the like, the welded edge 2.2 and the portion of the pipe material 3 that they contact are melted, and the welded edge 2.2 is melted.
2 is deformed into a shape that follows the outer peripheral surface of the tube material 3, and the fin 1 is
.. Fins 1.
1 to the pipe material 3. Incidentally, it goes without saying that the means for melting the welding edge 2.2 and the portion of the tube material 3 with which they abut may be a swamp welding machine or the like.
前記切除部4を形成することにより、溶接縁2とフィン
1の斜辺とにより形成される角部、即ち、過剰溶着の生
じやすい部分を予め取除いて過剰溶着やそれによる溶接
歪等が生じにくくすることが出来る。By forming the cutout portion 4, the corner formed by the welding edge 2 and the oblique side of the fin 1, that is, the portion where excessive welding is likely to occur, is removed in advance, so that excessive welding and the resulting welding distortion are less likely to occur. You can.
上記の如き操作の繰り返しにより、管材3の長手方向に
沿って所定間隔でフィン1.1を取付けていく。By repeating the above operations, the fins 1.1 are attached at predetermined intervals along the length of the tube 3.
なお、管材3の長手方向に沿一つで所定間隔でフィン1
を配し、複数枚のフィン1を一挙同時に管材3に溶着し
ても良いことは勿論である。Note that the fins 1 are arranged at predetermined intervals along the longitudinal direction of the pipe material 3.
Of course, a plurality of fins 1 may be welded to the tube material 3 at the same time.
このようにして製造された熱交換管6は、フィン】の斜
辺に対して45°の角度で排ガス等の高温流体が流れる
ような状態で、使用されるものである。このようにする
ことにより、排ガス等の熱流体の流れをフィン1.1の
斜辺間の間隔5部分で乱れさせて、熱交換効率を高める
ことが出来る。The heat exchange tube 6 manufactured in this manner is used in a state where high temperature fluid such as exhaust gas flows at an angle of 45° to the oblique side of the fin. By doing so, the flow of thermal fluid such as exhaust gas can be disturbed in the interval 5 between the oblique sides of the fins 1.1, and the heat exchange efficiency can be increased.
第4図に基づいて、第2実施例を説明する。フィン1の
斜辺中央部には、管材3の外周半径Rよりもやや小さな
曲率半径R//の溶接縁2を形成する。A second embodiment will be described based on FIG. At the center of the oblique side of the fin 1, a welded edge 2 having a radius of curvature R// which is slightly smaller than the outer circumferential radius R of the tube material 3 is formed.
それ以外は、第1の実施例と同一であるので、その説明
は省略する。The rest is the same as the first embodiment, so the explanation thereof will be omitted.
第1、第2実施例から明らかなように、溶接縁2は、要
するに、管材3の外周半径Rに近似するけれどもそれと
は一致しない曲率半径の円弧状であればよい。溶接縁2
の曲率半径は、素材、溶は込み量等に基づいて自由に設
定することが出来る。As is clear from the first and second embodiments, the welding edge 2 only needs to have a circular arc shape with a radius of curvature that approximates but does not match the outer radius R of the tube material 3. Welded edge 2
The radius of curvature can be freely set based on the material, amount of penetration, etc.
以上の次第でこの発明方法によれば、フィンの溶接縁を
管材の外周半径に近似するけれどもそれとは一致しない
曲率半径の円弧状とし、この溶接縁を管材に圧接しつつ
溶融させて、溶接縁を管材の外周面に沿う形状に変形さ
せて、フィンを管材に溶着するものであるから、即ち、
溶着開始時における溶接縁と管材との接触面積を小さく
し、溶接が進行する間、溶接縁の、溶融が行なオつれて
いない部分が順次管材に接触するようにして、フィンを
押圧する力が小さくても、溶着しようとする部分に作用
する単位面積当りの圧力を大きくすることが出来るので
、溶着不良を生じないようにすることが出来る。また、
抵抗溶接機を使用して溶接する場合、溶接開始時、溶接
縁と管材の接触面積を小さくし、その部分に大電流を流
すことが出来るものであるから、当初の接触部分を容易
に溶着し、その間にそれに続く部分を予熱し、その予熱
した部分を既溶着の部分に続いて溶着するものであるか
ら、従来方法と相違して大電流を必要とせず、また従来
方法に用いる抵抗溶接機に比して小電流しか発生出来な
い安価な抵抗溶接機を使用することが出来る。更に、溶
着を一挙に行なわず、溶接縁を変形させつつ順次に溶着
を行なうものであるから、過剰溶着やそれによる溶接歪
を少なくすることが出来る。As described above, according to the method of the present invention, the welded edge of the fin is formed into an arc shape with a radius of curvature that approximates but does not match the outer radius of the pipe material, and the welded edge is melted while being pressed against the pipe material. The fins are welded to the tube material by deforming the fins into a shape that follows the outer peripheral surface of the tube material, that is,
The force that presses the fin is made by reducing the contact area between the welding edge and the pipe material at the start of welding, and while welding progresses, the parts of the welding edge that have not been melted and have not been undone come into contact with the pipe material one after another. Even if the welding area is small, the pressure per unit area that acts on the part to be welded can be increased, so welding defects can be prevented. Also,
When welding using a resistance welder, at the start of welding, the contact area between the weld edge and the pipe material is reduced and a large current can be passed through that area, making it easier to weld the initial contact area. During this process, the following part is preheated, and the preheated part is welded following the already welded part, so unlike the conventional method, it does not require a large current, and the resistance welding machine used in the conventional method An inexpensive resistance welding machine that can generate only a small current can be used. Furthermore, since welding is not performed all at once, but is performed sequentially while deforming the welding edge, excessive welding and welding distortion caused by it can be reduced.
図面はこの発明の詳細な説明するためのもので、第1図
は第1実施例におけるフ1′ンを管材に溶着する前の状
態を示す縦断面図、第2図は完成品である熱交換管の縦
断面図、第3図は熱交換管の一部破砕の要部側面図、第
4図は第2実施例におけるフィンを管材に溶着する前の
状態を示す縦断面図である。
1・・・フィン、2・・・溶接縁、3・・管材、6・・
熱交換管、
特許出願人 西田鉄工株式会社
弁理士The drawings are for explaining the present invention in detail. Fig. 1 is a longitudinal cross-sectional view showing the state before the fan 1' is welded to the pipe material in the first embodiment, and Fig. 2 is a longitudinal sectional view showing the finished product. FIG. 3 is a longitudinal cross-sectional view of the exchange tube, FIG. 3 is a side view of the main part of the heat exchange tube partially crushed, and FIG. 4 is a longitudinal cross-sectional view showing the state before the fins are welded to the tube material in the second embodiment. 1...Fin, 2...Welded edge, 3...Pipe material, 6...
Heat exchange tube, patent applicant Nishida Tekko Co., Ltd., patent attorney
Claims (1)
径に近似するけれどもそれとは一致しない曲率半径の円
弧状とし、この溶接縁(2)を管材(3)に圧接しつつ
溶融させて、溶接縁(2)を管材(3)の外周面に沿う
形状に変形させて、フィン(1)を管材(2)に溶着す
ることを特徴とする熱交換管の製造方法。 2、前記フィン(+)の溶接縁(2)の両終端角部夫々
を切除いて切除部(4)を形成する特許請求の範囲第1
項記載の熱交換管の製造方法。 3、前記フィン(1)を直角二等辺三角形状とし、その
斜辺がわに溶接縁(2)を形成する特許請求の範囲第1
項記載の熱交換管の製造方法。[Claims] 1. The welded edge (2) of the fin (1) is made into an arc with a radius of curvature that approximates but does not match the outer circumferential radius of the tube (3), and this welded edge (2) is attached to the tube (3). A heat exchange method characterized by welding the fin (1) to the tube material (2) by melting the fin (1) while pressurizing the tube material (3) and deforming the weld edge (2) into a shape that follows the outer peripheral surface of the tube material (3). Method of manufacturing tubes. 2. Claim 1, wherein the cutout portion (4) is formed by cutting off both terminal corner portions of the welded edge (2) of the fin (+), respectively.
2. Method for manufacturing heat exchange tubes as described in Section 1. 3. The fin (1) has a right-angled isosceles triangular shape, and the welded edge (2) is formed on the hypotenuse of the fin (1).
2. Method for manufacturing heat exchange tubes as described in Section 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16051282A JPS5950934A (en) | 1982-09-13 | 1982-09-13 | Manufacture of heat exchanging tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16051282A JPS5950934A (en) | 1982-09-13 | 1982-09-13 | Manufacture of heat exchanging tube |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5950934A true JPS5950934A (en) | 1984-03-24 |
Family
ID=15716545
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16051282A Pending JPS5950934A (en) | 1982-09-13 | 1982-09-13 | Manufacture of heat exchanging tube |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5950934A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5718576A (en) * | 1980-07-07 | 1982-01-30 | Tange Tekkosho Kk | Method of mounting fork pawl to fork leg |
-
1982
- 1982-09-13 JP JP16051282A patent/JPS5950934A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5718576A (en) * | 1980-07-07 | 1982-01-30 | Tange Tekkosho Kk | Method of mounting fork pawl to fork leg |
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