JPH07111492B2 - Manufacturing method of aluminum tube with optical fiber - Google Patents
Manufacturing method of aluminum tube with optical fiberInfo
- Publication number
- JPH07111492B2 JPH07111492B2 JP61104479A JP10447986A JPH07111492B2 JP H07111492 B2 JPH07111492 B2 JP H07111492B2 JP 61104479 A JP61104479 A JP 61104479A JP 10447986 A JP10447986 A JP 10447986A JP H07111492 B2 JPH07111492 B2 JP H07111492B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- optical fiber
- aluminum
- aluminum tube
- welded
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4486—Protective covering
- G02B6/4488—Protective covering using metallic tubes
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Communication Cables (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は光ファイバ入りアルミ管の製造方法に関するも
のである。The present invention relates to a method for manufacturing an aluminum tube containing an optical fiber.
（従来技術） 近年、電力光複合ケーブルの需要が多くなり、新しい情
報通信媒体として期待されている。電力光複合ケーブル
は、光ファイバ入りアルミ管の外周にアルミ線を撚り合
せた構造になっている。この光ファイバ入りアルイミ管
の仕様は、外径４〜7mm、抗張力17kg/mm2、導電率61
％、完全気密である。アルミ管の造管は難しく、条長20
00m〜3000mの長尺体を連続して成形溶接し、完全気密に
することは、成形の完全性、溶接の完全性から難しい。
特に、溶接では電極の寿命があるため長いもの程、シー
ム部を一様な品質に維持することは難しい。(Prior Art) In recent years, the demand for power-optical composite cables has increased, and they are expected as new information communication media. The power-optical composite cable has a structure in which aluminum wires are twisted around the outer circumference of an aluminum tube containing an optical fiber. The specifications of this Alumi tube with optical fiber are outer diameter 4 ~ 7mm, tensile strength 17kg / mm 2 , conductivity 61.
%, Completely airtight. Making aluminum pipes is difficult, with a strip length of 20
It is difficult to continuously form and weld a long body of 00 m to 3000 m to be completely airtight in terms of the completeness of forming and the completeness of welding.
Particularly, in welding, since the life of the electrode is long, it is difficult to maintain uniform quality of the seam as the length of the electrode becomes longer.
従来、光ファイバ入りアルミ管の製造は、光ファイバを
縦添えしながらアルミテープを逐次造管成形してそのシ
ーム部を電気溶接し、溶接直後に冷却した後縮径して加
工硬化させ、溶接によって下った抗張力を回復させ、仕
様の強度を出している。Conventionally, the manufacture of aluminum pipes with optical fibers is carried out by sequentially forming an aluminum tape with the optical fiber vertically attached, electrically welding the seam, cooling immediately after welding, then reducing the diameter to work-harden, and welding. By recovering the tensile strength that has dropped due to, the strength of the specifications has been achieved.
ところで、このような抗ファイバ入りアルミ管の製造時
には、電極の交換、作業員の休憩等のために作業を一旦
停止し、その後作業を再開することがある。この場合、
従来のアルミ以外の金属管の場合には、起動時に金属管
を一旦逆方向に戻して、前回の作業の溶接部の末端を重
複して溶接して新たなシーム部の電気溶接を再開してい
た。By the way, at the time of manufacturing such an anti-fiber-containing aluminum tube, the work may be temporarily stopped for the purpose of exchanging electrodes, rest of workers, etc., and then restarted. in this case,
In the case of conventional metal pipes other than aluminum, the metal pipe is temporarily returned in the opposite direction at startup, the ends of the welds from the previous work are overlapped and welded, and electric welding of the new seam is restarted. It was
（発明が解決しようとする問題点） しかしながら、アルミ管の電気溶接（例えば、TIG溶
接）に上記の如き再起動の方法をとると、第４図（ａ）
に示すようにアルミ管の受ける熱影響は、溶接停止・再
起動部では熱影響が完全に重複し、総合熱影響は第４図
（ｂ）に示すように溶接停止・再起動部で大きなピーク
値を示し、このためアルミ管の抗張力は第４図（ｃ）に
示すように溶接停止・再起動部で著しく低下してしまう
問題点があった。このようにアルミ管の抗張力が低下す
ると、内部の光ファイバが外力の影響を受けるようにな
り好ましくない。(Problems to be Solved by the Invention) However, when the above-mentioned restart method is adopted for electric welding (for example, TIG welding) of an aluminum pipe, FIG. 4 (a)
As shown in Fig. 4, the heat effect on the aluminum pipe completely overlaps at the welding stop / restart part, and the total heat effect has a large peak at the weld stop / restart part as shown in Fig. 4 (b). Therefore, there is a problem that the tensile strength of the aluminum pipe is significantly lowered at the welding stop / restart portion as shown in FIG. 4 (c). When the tensile strength of the aluminum tube is lowered in this way, the internal optical fiber is affected by an external force, which is not preferable.
本発明の目的は、溶接停止・再起動部でのアルミ管の抗
張力の低下を抑制できる光ファイバ入りアルミ管の製造
方法を提供することにある。An object of the present invention is to provide a method for manufacturing an aluminum tube containing an optical fiber, which can suppress a decrease in tensile strength of the aluminum tube at a welding stop / restart section.
（問題点を解決するための手段） 上記の目的を達成するための本発明の手段を、実施例に
対応する第１図乃至第３図を参照して説明すると、本発
明は光ファイバ４を縦添えしつつアルミテープ２′を前
記光ファイバ４が内蔵されるように逐次造管成形し、前
記アルミテープ２′のシーム部９を逐次電気溶接して光
ファイバ入りのアルミ管12を製造する光ファイバ入りア
ルミ管の製造方法において、前記アルミテープ２′の電
気溶接を途中で停止した後再起動する際に、停止前の溶
接部9Aの末端9AEに対して長手方向に間隔をあけて前記
シーム部９に非溶接部分9Bを作り、その先から前記シー
ム部９の電気溶接を再開し、前記シーム部９の前記非溶
接部分9Bはレーザ溶接することを特徴とする。(Means for Solving the Problems) The means of the present invention for achieving the above object will be described with reference to FIGS. 1 to 3 corresponding to the embodiments. The aluminum tape 2'is successively pipe-formed so that the optical fiber 4 is built in vertically, and the seam portion 9 of the aluminum tape 2'is successively electrowelded to manufacture the aluminum tube 12 containing the optical fiber. In the method for manufacturing an aluminum tube containing an optical fiber, when the electric welding of the aluminum tape 2'is stopped and restarted, the aluminum tape 2'is longitudinally spaced from the end 9AE of the welded portion 9A before the stop. A non-welded portion 9B is formed in the seam portion 9, electric welding of the seam portion 9 is restarted from that point, and the non-welded portion 9B of the seam portion 9 is laser-welded.
（作用） このように電気溶接を再開する際に、シーム部９に非溶
接部分9Bを設けてその先から電気溶接をし、非溶接部分
9Bはレーザ溶接すると、アルミ管７の溶接停止・再起動
部での熱影響の重複を避け、抗張力の低下を抑制でき
る。(Function) When the electric welding is restarted in this way, the non-welded portion 9B is provided in the seam portion 9 and the electric welding is performed from the tip thereof, and
When 9B is laser welded, it is possible to avoid overlapping of heat effects at the welding stop / restart portion of the aluminum pipe 7 and suppress a decrease in tensile strength.
（実施例） 以下本発明の実施例を第１図乃至第３図を参照して詳細
に説明する。図示のように、テープサプライ１からはア
ルミテープ２′をサプライし、ファイバサプライ３から
は光ファイバ４をサプライし、光ファイバ４はアルミテ
ープ２′の上面中央に縦添えして成形工程５に供給す
る。成形工程５では光ファイバ４を内蔵するようにして
アルミテープ２′を造管成形し、電気溶接工程６に送
る。電気溶接工程６では成形されたアルミ管２を溶接ロ
ール８で両側から押え、そのシーム部９を溶接トーチ10
の電極11からアークを飛ばして電気溶接し、シーム部９
に溶接部9Aを逐次形成して密封し、光ファイバ入りアル
ミ管12を連続的に成形する。(Embodiment) An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 3. As shown in the figure, the tape supply 1 supplies the aluminum tape 2 ', the fiber supply 3 supplies the optical fiber 4, and the optical fiber 4 is vertically attached to the center of the upper surface of the aluminum tape 2'in the molding step 5. Supply. In the molding step 5, the aluminum tape 2'is pipe-molded so that the optical fiber 4 is built therein, and is sent to the electric welding step 6. In the electric welding process 6, the formed aluminum pipe 2 is pressed by the welding rolls 8 from both sides, and the seam portion 9 is welded by the welding torch 10.
The arc is blown from the electrode 11 of the
The welded portion 9A is sequentially formed on the aluminum plate and sealed, and the aluminum tube 12 containing the optical fiber is continuously molded.
このような光ファイバ入りアルミ管12の製造過程で作業
を一旦停止し、再起動する際には、停止前の溶接部9Aの
末端9AEに対して長手方向に間隔をあけてシーム部９に
非溶接部分9Bを作り、その先からシーム部９の電気溶接
を再開する。非溶接部分9Bは、次のレーザ溶接工程13に
送り、レーザ溶接機14から光ファイバ15を経てレーザ光
を放出させてレーザ溶接して密封する。光ファイバ15は
ホルダー16で位置決めする。When the work is temporarily stopped and restarted in the manufacturing process of such an aluminum tube 12 with an optical fiber, the seam portion 9 is not spaced from the end 9AE of the welded portion 9A before the stop at a longitudinal interval. The welded portion 9B is made, and the electric welding of the seam portion 9 is restarted from that point. The non-welded portion 9B is sent to the next laser welding step 13, where laser light is emitted from the laser welder 14 through the optical fiber 15 and laser welded to seal it. The optical fiber 15 is positioned by the holder 16.
溶接が終った光ファイバ入りアルミ管12は直ちに冷却工
程17に送り、冷却水槽18中に光ファイバ入りアルミ管12
を通して冷却し、光ファイバ４が熱的損傷を受けないよ
うにする。Immediately after welding, the optical fiber-containing aluminum tube 12 is sent to the cooling step 17, and the optical fiber-containing aluminum tube 12 is placed in the cooling water tank 18.
To prevent the optical fiber 4 from being thermally damaged.
冷却した光ファイバ入りアルミ管12は、次に縮径工程19
に送り、アルミ管２を所要のサイズに縮径し、且つ加工
硬化させ、所要の抗張力を得るようにし、しかる後、巻
取りドラム20に巻取る。The cooled aluminum tube 12 containing the optical fiber is then subjected to the diameter reduction step 19
To reduce the diameter of the aluminum tube 2 to a required size and work-harden it so as to obtain a required tensile strength. Then, the aluminum tube 2 is wound on a winding drum 20.
レーザ溶接工程13は電気溶接工程６と冷却工程17との間
で行われ、この間のスペースは小さい方が溶接熱による
悪影響を避けるため好ましいが、このような小さなスペ
ースでも光ファイバ15でレーザ光を導いて来ると、容易
にレーザ溶接が行える。The laser welding process 13 is performed between the electric welding process 6 and the cooling process 17, and it is preferable that the space between them is small in order to avoid adverse effects due to welding heat. However, even in such a small space, the laser beam is emitted by the optical fiber 15. Laser welding can be easily done by guiding.
レーザの能力から、非溶接部9Bのレーザ溶接時には、ラ
インピードを下げ、非溶接部9Bのレーザ溶接後にライン
スピードを上げるようにする。ラインスピードを下げた
ときには、電気溶接の電流を小さくしてシーム溶接し、
レーザ溶接が終了するとラインスピードの上昇に同期し
て電気溶接の電流値を上げ、シーム溶接を行う。Due to the capability of the laser, the line speed is lowered during laser welding of the non-welded portion 9B, and the line speed is increased after laser welding of the non-welded portion 9B. When the line speed is reduced, the electric welding current is reduced to seam welding,
When laser welding is completed, the current value of electric welding is increased in synchronization with the increase in line speed to perform seam welding.
電気溶接は、例えば、交流TIG溶接、高周波TIG溶接、プ
ラズマ溶接等で行う。The electric welding is performed by, for example, AC TIG welding, high frequency TIG welding, plasma welding or the like.
レーザ溶接は、例えば、400WのYAGレーザ溶接で行う。Laser welding is performed by 400 W YAG laser welding, for example.
このように溶接を行うと、第３図（ａ）に示すようにア
ルミ管２が受ける電気溶接による熱影響は、非溶接部9B
で前後が完全に重複することがなく、該非溶接部9Bにレ
ーザ溶接を行ってもその熱影響は僅かであり、アルミ管
２の抗張力の変化は電気溶接だけの場合は第３図（ｂ）
に示す通りであり、これにレーザ溶接が加わったときの
アルミ管２の抗張力の変化は第３図（ｃ）に示す通りで
あり、溶接停止・再起動部でアルミ管２の抗張力が著し
く低下しなくなる。When welding is performed in this way, the heat effect of the electric welding on the aluminum pipe 2 as shown in FIG.
In the case where laser welding is performed on the non-welded portion 9B, the thermal effect is slight, and the change in tensile strength of the aluminum pipe 2 is only by electric welding.
The change in tensile strength of the aluminum tube 2 when laser welding is applied is as shown in Fig. 3 (c), and the tensile strength of the aluminum tube 2 is significantly reduced at the welding stop / restart portion. Will not do.
実験例 外径8.5mmのアルミ管を成形し、そのシーム部をTIG溶接
した。ラインスピードは４〜5m/minとし、溶接電流は40
Aとした。ラインを一旦停止し、再起動時にはシーム部
に約10mmの非溶接部を設けた。再起動時には、この非溶
接部をYAGレーザでレーザ溶接した。レーザ溶接は、出
力400W、60ppsのパルスレーザを用いて行った。レーザ
溶接中はライン速度を落したが、レーザ溶接後は通常の
ライン速度に戻して電気溶接を続行した。溶接後、光フ
ァイバ入りアルミ管を冷却し、縮径工程で外径6mmに縮
径し、17kg/mm2の抗張力を得た。Experimental Example An aluminum tube with an outer diameter of 8.5 mm was molded, and its seam was TIG welded. Line speed is 4-5m / min, welding current is 40
A. The line was stopped once, and when restarted, a non-welded area of about 10 mm was provided at the seam. At the time of restart, this non-welded portion was laser-welded with a YAG laser. Laser welding was performed using a pulse laser with an output of 400 W and 60 pps. The line speed was reduced during laser welding, but after laser welding, the normal line speed was restored and electric welding was continued. After the welding, the aluminum tube containing the optical fiber was cooled, and the outer diameter was reduced to 6 mm in the diameter reduction step to obtain a tensile strength of 17 kg / mm 2 .
（発明の効果） 以上説明したように本発明では、アルミ管のシーム部の
電気溶接を一旦停止した後、再起動するに際し、前回の
溶接部の末端のシーム部に非溶接部を設けて電気溶接を
再開し、非溶接部は次工程でレーザ溶接するので、アル
ミ管の溶接停止・再起動部には電気溶接による熱影響が
完全に重なり合わず、レーザ溶接による僅かな熱影響が
与えられるだけとなり、アルミ管の抗張力の低下を抑制
でき、全長にわたりほぼ一様な強度を得ることができ
る。(Effects of the Invention) As described above, according to the present invention, when the electric welding of the seam portion of the aluminum pipe is temporarily stopped and then restarted, a non-welded portion is provided at the seam portion at the end of the previous welding portion so that the electric welding is performed. Since the welding is restarted and the non-welded part is laser-welded in the next process, the heat effect due to electric welding does not completely overlap with the weld stop / restart part of the aluminum pipe, and a slight heat effect due to laser welding is given. As a result, it is possible to suppress the decrease in tensile strength of the aluminum pipe and obtain a substantially uniform strength over the entire length.
第１図は本発明の方法の実施状態の一例を示す斜視図、
第２図は本発明の方法の工程の一例を示す工程図、第３
図は本発明の方法によるアルミ管の熱影響と抗張力との
状態を示す線図、第４図は従来の方法によるアルミ管の
熱影響と抗張力の関係を示す線図である。 ２……アルミ管、４……光ファイバ、５……成形工程、
６……電気溶接工程、９……シーム部、9A……溶接部、
9B……非溶接部分、9AE……末端、13……レーザ溶接工
程、17……冷却工程、19……縮径工程。FIG. 1 is a perspective view showing an example of an implementation state of the method of the present invention,
FIG. 2 is a process drawing showing an example of the process of the method of the present invention, FIG.
FIG. 4 is a diagram showing a state of heat influence and tensile strength of the aluminum pipe by the method of the present invention, and FIG. 4 is a diagram showing a relationship between heat influence and tensile strength of the aluminum pipe by the conventional method. 2 ... Aluminum tube, 4 ... Optical fiber, 5 ... Molding process,
6 ... Electric welding process, 9 ... Seam part, 9A ... Welded part,
9B: non-welded part, 9AE: end, 13: laser welding process, 17: cooling process, 19: diameter reduction process.
Claims (1)
前記光ファイバが内蔵されるように逐次造管成形し、前
記アルミテープのシーム部を逐次電気溶接して光ファイ
バ入りのアルミ管を製造する光ファイバ入りアルミ管の
製造方法において、前記アルミテープの電気溶接を途中
で停止した後再起動する際に、停止前の溶接部の末端に
対して長手方向に間隔をあけて前記シーム部に非溶接部
分を作り、その先から前記シーム部の電気溶接を再開
し、前記シーム部の前記非溶接部分はレーザ溶接するこ
とを特徴とする光ファイバ入りアルミ管の製造方法。Claim: What is claimed is: 1. An aluminum tape is vertically formed so that the optical fiber is built into the aluminum tape, and the seams of the aluminum tape are sequentially electrowelded to produce an aluminum tube containing the optical fiber. In the method for manufacturing an aluminum tube containing an optical fiber, when the electric welding of the aluminum tape is restarted after being stopped halfway, the seam portion is provided with a space in the longitudinal direction with respect to the end of the welded portion before the stop. A method of manufacturing an aluminum tube containing an optical fiber, characterized in that a non-welded portion is formed, electric welding of the seam portion is restarted from that point, and the non-welded portion of the seam portion is laser-welded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61104479A JPH07111492B2 (en) | 1986-05-07 | 1986-05-07 | Manufacturing method of aluminum tube with optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61104479A JPH07111492B2 (en) | 1986-05-07 | 1986-05-07 | Manufacturing method of aluminum tube with optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62262007A JPS62262007A (en) | 1987-11-14 |
| JPH07111492B2 true JPH07111492B2 (en) | 1995-11-29 |
Family
ID=14381699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61104479A Expired - Fee Related JPH07111492B2 (en) | 1986-05-07 | 1986-05-07 | Manufacturing method of aluminum tube with optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07111492B2 (en) |
-
1986
- 1986-05-07 JP JP61104479A patent/JPH07111492B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62262007A (en) | 1987-11-14 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |