JP3451492B2 - Diameter reduction method for end of heat exchange tube with inner fin - Google Patents
Diameter reduction method for end of heat exchange tube with inner finInfo
- Publication number
- JP3451492B2 JP3451492B2 JP27145793A JP27145793A JP3451492B2 JP 3451492 B2 JP3451492 B2 JP 3451492B2 JP 27145793 A JP27145793 A JP 27145793A JP 27145793 A JP27145793 A JP 27145793A JP 3451492 B2 JP3451492 B2 JP 3451492B2
- Authority
- JP
- Japan
- Prior art keywords
- heat exchange
- tube
- exchange tube
- fins
- diameter
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/006—Tubular elements; Assemblies of tubular elements with variable shape, e.g. with modified tube ends, with different geometrical features
Description
【０００１】[0001]
【産業上の利用分野】本発明はインナーフィン付き熱交
換管の端部縮径方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reducing the diameter of an end portion of a heat exchange tube with an inner fin.
【０００２】[0002]
【従来の技術】内周面に長さ方向に伸び且つ円周方向に
間隔をおいてフィンが一体的に設けられている押出形材
製のインナーフィン付き熱交換管の端部は、配管用の他
のパイプを接続するために縮径する必要がある。そし
て、この熱交換管の端部における縮径のため、平行スウ
ェージングが施される。2. Description of the Related Art An end portion of a heat exchange tube with an inner fin made of an extruded shape, which is integrally formed with fins extending in the lengthwise direction on the inner peripheral surface and spaced apart in the circumferential direction, is used for piping. It is necessary to reduce the diameter in order to connect other pipes. Parallel swaging is performed due to the reduced diameter at the end of the heat exchange tube.
【０００３】従来、平行スウェージングを行うにあたっ
ては、図６に示すように、熱交換管(31)の端部内周面に
おけるインナーフィン(32)について座ぐりを行うことに
より、インナーフィン(32)を所定長さ(L)だけ除去して
いた。Conventionally, when performing parallel swaging, as shown in FIG. 6, the inner fins (32) on the inner peripheral surface of the end portion of the heat exchange tube (31) are countersunk to make inner fins (32). Was removed by a predetermined length (L).
【０００４】[0004]
【発明が解決しようとする課題】上述した端部縮径方法
の場合、スウェージングを行う前に、常に座ぐり工程が
必要となり、またこの座ぐりには一定の精度が要求され
ることから、端部加工の作業能率が低下するという問題
があった。さらに、上記座ぐり作業の際に、その削りく
ず等の異物が熱交換管(31)内に入り易く、そのため熱交
換器の性能に悪影響を及ぼすおそれがあった。In the case of the above-described method of reducing the diameter of the end portion, a counterbore step is always required before swaging, and a certain accuracy is required for this counterbore. There has been a problem that the work efficiency of edge processing is reduced. Furthermore, during the above-mentioned counter boring operation, foreign matter such as shavings easily enters the heat exchange tube (31), which may adversely affect the performance of the heat exchanger.
【０００５】本発明の目的は、インナーフィンの除去工
程を必要せず、しかも管の接続端部の強度を高めること
ができるインナーフィン付き熱交換管の端部縮径方法を
提供することにある。An object of the present invention is to provide a method for reducing the diameter of the end portion of a heat exchange tube with an inner fin, which does not require a step of removing the inner fin and can enhance the strength of the connecting end portion of the tube. .
【０００６】[0006]
【課題を解決するための手段】本発明のインナーフィン
付き熱交換管の端部縮径方法は、内周面に長さ方向に伸
び且つ円周方向に所定間隔でフィンが設けられている熱
交換管の端部におけるフィンのない管中央の空間にマン
ドレルを挿入した後、この熱交換管の端部に平行スウェ
ージングを施すことにより、熱交換管端部を縮径させる
とともに、フィンを座屈させて熱交換管の管壁の一部と
して熱交換管端部の肉厚を増大させることを特徴とする
ものである。A method for reducing the diameter of an end portion of a heat exchange tube with an inner fin according to the present invention is a method in which fins are provided on an inner peripheral surface in a lengthwise direction and circumferentially at predetermined intervals. After inserting the mandrel into the space at the center of the tube without fins at the end of the exchange tube, reduce the diameter of the end of the heat exchange tube by applying parallel swaging to the end of this heat exchange tube .
Together with a portion of the pipe wall of the heat exchange tube fins to buckling
Then, the wall thickness of the end portion of the heat exchange tube is increased .
【０００７】本発明のインナーフィン付き熱交換管は、
熱交換管の内周面に、長さ方向に伸びるフィンが円周方
向に所定間隔で設けられており、熱交換管端部のフィン
が座屈させられて熱交換管の管壁の一部となることによ
り、熱交換管端部の肉厚が増大させられているものであ
る。The heat exchange tube with the inner fin of the present invention is
Circumferentially extending fins on the inner surface of the heat exchange tube
Fins at the end of the heat exchange tube
Is buckled and becomes part of the wall of the heat exchange tube.
Therefore, the wall thickness of the end of the heat exchange tube is increased.
It
【０００８】[0008]
【作用】本発明の端部縮径方法によれば、熱交換管のイ
ンナーフィンを除去せずに、そのまま熱交換管の端部に
おけるスウェージングが行える。しかも、熱交換管の端
部のインナーフィンはスウェージング時にマンドレルと
ダイス間に挟まれて座屈し、管壁の一部となされること
から、該熱交換管端部の肉厚が増加して該部の強度が高
められる。According to the method of reducing the diameter of the end portion of the present invention, swaging can be performed on the end portion of the heat exchange tube without removing the inner fins of the heat exchange tube. Moreover, the inner fins at the ends of the heat exchange tubes are sandwiched between the mandrel and the die during swaging and buckle, and become part of the tube wall, which increases the wall thickness of the ends of the heat exchange tubes. The strength of the portion is increased.
【０００９】[0009]
【実施例】次に、本発明方法を自動車の油圧式パワース
テアリング装置用オイルクーラにおける熱交換管の端部
加工に適用した場合の実施例について説明する。EXAMPLE Next, an example in which the method of the present invention is applied to the processing of the end portion of the heat exchange pipe in the oil cooler for the hydraulic power steering system of an automobile will be described.
【００１０】先ず、内周面に長さ方向に伸び且つ内周面
からの突出高さが異なる複数のフィン(1)が円周方向に
間隔をおいて交互に設けられている横断面円形のアルミ
ニウム管(2)（図１参照）を押出成形した後、このアル
ミニウム管(2)の端部をダイス内に挿入すると共にアル
ミニウム管(2)端部におけるフィン(1)のない管中央の空
間(3)にマンドレル(4)を挿入した後、アルミニウム管
(2)を回転させつつ、ダイスによりアルミニウム管(2)に
打撃を与えてスウェージングを施す。First, a plurality of fins (1) extending in the lengthwise direction on the inner peripheral surface and having different projecting heights from the inner peripheral surface are provided alternately at circumferential intervals with a circular cross section. After extrusion molding the aluminum tube (2) (see Fig. 1), insert the end of this aluminum tube (2) into the die and at the end of the aluminum tube (2) the space in the center of the tube without fins (1) After inserting the mandrel (4) into (3), aluminum tube
While rotating (2), swaging is performed by hitting the aluminum tube (2) with a die.
【００１１】上記スウェージングによって図２〜図４に
示すように、アルミニウム管(2)の端部が縮径されると
共に各フィン(1)がマンドレルとダイス間に挟まれて座
屈し、管壁(2a)の一部となされる結果、アルミニウム管
(2)端部の肉厚が当初の(t)から(T)に増加する。この場
合、アルミニウム管(2)の肉厚は、通常、当初の１．５
〜２倍程度増加することとなる。As shown in FIGS. 2 to 4, the swaging reduces the diameter of the end of the aluminum tube (2) and causes the fins (1) to be pinched between the mandrel and the die and buckled to cause the tube wall. Aluminum tube as a result of being made part of (2a)
(2) The wall thickness at the edge increases from the initial (t) to (T). In this case, the wall thickness of the aluminum tube (2) is usually 1.5
~ 2 times increase.
【００１２】本発明は上述した所謂ロータリ・スウェー
ジングに限らず、リンク・スウェージング等で行っても
差支えない。The present invention is not limited to the so-called rotary swaging described above, but may be performed by link swaging or the like.
【００１３】上述したスウェージング加工の後、図５に
示すように、アルミニウム管(2)の端部を成形型(5)内に
挿入した後、アルミニウム管(2)内を加圧することによ
り、バルジ加工を行う。After the swaging process described above, as shown in FIG. 5, the end of the aluminum tube (2) is inserted into the forming die (5), and then the inside of the aluminum tube (2) is pressurized, Perform bulge processing.
【００１４】[0014]
【発明の効果】本発明のインナーフィン付き熱交換管の
端部縮径方法によれば、インナーフィンを除去せずに、
そのまま熱交換管端部のスウェージングを行うことがで
きる。そのため、従来行われていた煩雑な座くり工程が
省略され、端部加工の作業能率の大幅な向上が期待でき
る。また、座くり工程の際に熱交換管内に削りくず等の
異物が入るという問題も解消される。又、本発明の縮径
方法によれば、配管の際における継手部分となる熱交換
管端部の肉厚が増加し、その強度を高めることができる
という格別の利点を有する。According to the method of reducing the diameter of the end portion of the heat exchange tube with the inner fin of the present invention, the inner fin is not removed,
The end portion of the heat exchange tube can be swaged as it is. Therefore, the complicated countersunk process which has been conventionally performed can be omitted, and a great improvement in the work efficiency of the end processing can be expected. Further, the problem that foreign matter such as shavings enters the heat exchange pipe during the counter boring process is also solved. Further, according to the diameter reducing method of the present invention, there is a particular advantage that the wall thickness of the end portion of the heat exchange pipe, which is a joint portion at the time of piping, is increased and the strength thereof can be increased.
【図１】本発明方法による縮径前の熱交換管端部の横断
面図である。FIG. 1 is a cross-sectional view of a heat exchange tube end portion before being reduced in diameter by the method of the present invention.
【図２】本発明方法による縮径後の熱交換管端部の側面
図である。FIG. 2 is a side view of the end portion of the heat exchange tube after the diameter is reduced by the method of the present invention.
【図３】本発明方法による縮径後の熱交換管端部の縦断
面図である。FIG. 3 is a vertical cross-sectional view of the end portion of the heat exchange tube after the diameter reduction by the method of the present invention.
【図４】図３におけるＡ−Ａ線断面図である。4 is a cross-sectional view taken along the line AA in FIG.
【図５】本発明方法による縮径後の熱交換管端部のバル
ジ加工の状態を示す要部断面図である。FIG. 5 is a cross-sectional view of an essential part showing a state of bulging of the end portion of the heat exchange tube after the diameter reduction by the method of the present invention.
【図６】従来の加工方法を示す熱交換管端部の縦断面図
である。FIG. 6 is a vertical cross-sectional view of a heat exchange tube end portion showing a conventional processing method.
(1) フィン (2) アルミニウム管 (3) 空間 (4) マンドレル (1) Fin (2) Aluminum tube (3) Space (4) Mandrel
Claims (2)
所定間隔でフィン(1)が設けられている熱交換管(2)の端
部におけるフィン(1)のない管中央の空間(3)にマンドレ
ル(5)を挿入した後、この熱交換管(2)の端部に平行スウ
ェージングを施すことにより、熱交換管(2)端部を縮径
させるとともに、フィン(1)を座屈させて熱交換管(2)の
管壁の一部として熱交換管(2)端部の肉厚を増大させる
ことを特徴とするインナーフィン付き熱交換管の端部縮
径方法。1. A center of a tube without fins (1) at the end of a heat exchange tube (2), which has fins (1) extending in the lengthwise direction on the inner peripheral surface and provided at predetermined intervals in the circumferential direction. After inserting the mandrel (5) into the space (3), apply parallel swaging to the end of this heat exchange tube (2) to reduce the diameter of the end of the heat exchange tube (2).
Together is characterized in that <br/> increasing the wall thickness of the part and to the heat exchange tubes (2) end of the tube wall of the fin (1) was buckling and heat exchange tubes (2) How to reduce the diameter of the end of heat exchange tubes with inner fins.
びるフィン(1)が円周方向に所定間隔で設けられてお
り、熱交換管(2)端部のフィン(1)が座屈させられて熱交
換管(2)の管壁の一部となることにより、熱交換管(2)端
部の肉厚が増大させられているインナーフィン付き熱交
換管。2. A heat exchange tube (2) having an inner peripheral surface extending in the longitudinal direction.
The fins (1) are installed at regular intervals in the circumferential direction.
The fins (1) at the ends of the heat exchange tubes (2) are buckled and heat is exchanged.
By forming a part of the wall of the exchange pipe (2), the end of the heat exchange pipe (2)
Heat exchange with inner fin whose wall thickness is increased
Exchange .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27145793A JP3451492B2 (en) | 1993-10-29 | 1993-10-29 | Diameter reduction method for end of heat exchange tube with inner fin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27145793A JP3451492B2 (en) | 1993-10-29 | 1993-10-29 | Diameter reduction method for end of heat exchange tube with inner fin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07124668A JPH07124668A (en) | 1995-05-16 |
| JP3451492B2 true JP3451492B2 (en) | 2003-09-29 |
Family
ID=17500305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27145793A Expired - Fee Related JP3451492B2 (en) | 1993-10-29 | 1993-10-29 | Diameter reduction method for end of heat exchange tube with inner fin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3451492B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2003275020A1 (en) | 2002-09-19 | 2004-04-08 | Blissfield Manufacturing Company | Process of end-forming a tube having internal surface features |
| CN102840784B (en) * | 2011-06-24 | 2016-04-27 | 乐金电子(天津)电器有限公司 | Heat radiation pipe and heat exchanger |
-
1993
- 1993-10-29 JP JP27145793A patent/JP3451492B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07124668A (en) | 1995-05-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20030527 |
|
| LAPS | Cancellation because of no payment of annual fees |