JPH0829361B2 - Flare tube manufacturing method - Google Patents
Flare tube manufacturing methodInfo
- Publication number
- JPH0829361B2 JPH0829361B2 JP3618387A JP3618387A JPH0829361B2 JP H0829361 B2 JPH0829361 B2 JP H0829361B2 JP 3618387 A JP3618387 A JP 3618387A JP 3618387 A JP3618387 A JP 3618387A JP H0829361 B2 JPH0829361 B2 JP H0829361B2
- Authority
- JP
- Japan
- Prior art keywords
- heating
- coil
- cooling
- tube
- frequency coil
- 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 - Lifetime
Links
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- Bending Of Plates, Rods, And Pipes (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- General Induction Heating (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明はフレアチューブの製造方法に関する。The present invention relates to a method for manufacturing a flare tube.
（従来の技術） 従来、フレアチューブの製造は、一般に液圧バルジ加
工によっていた。しかしながら、この液圧バルジ加工に
よれば、素管を液密に保持するための高精度な成形型を
必要とするばかりか、大型の油圧ユニットが必要で、設
備コストが高くつくという問題があった。(Prior Art) Conventionally, the production of flare tubes has generally been performed by hydraulic bulging. However, this hydraulic bulging process not only requires a highly accurate molding die for holding the raw pipe in a liquid-tight manner, but also requires a large hydraulic unit, which causes a problem of high equipment cost. It was
ところで、最近、鋼管を局部的に円周方向に加熱した
後、両管端から圧縮荷重を加えて加熱部分を膨出させる
ことを、所定のピッチで繰り返すことによりフレアチュ
ーブを製造する技術が開発されている（特開昭59−1445
29号公報）。この方法によれば、成形型を必要としない
ため、設備コストの低減を図ることができると共に、任
意の大きさや肉厚の素管を対象とし得るという製造上の
自由度が得られるようになる。By the way, recently, a technology has been developed for manufacturing flare tubes by locally heating a steel pipe in the circumferential direction and then applying a compressive load from both pipe ends to swell the heated portion at a predetermined pitch. (Japanese Patent Laid-Open No. 59-1445)
No. 29 publication). According to this method, since a molding die is not required, it is possible to reduce the equipment cost and also to obtain the degree of freedom in manufacturing that the target can be a raw pipe of any size and thickness. .
（発明が解決しようとする問題点） しかしながら、上記新たなフレアチューブの製造方法
によれば、先に膨出成形した山（既成形山）に現在の加
熱部分から熱が伝達されるため、成形ピッチを小さくし
ようとすると、前記熱の影響により既成形山が座屈して
しまい、成形不能に落ち入り易いという問題があった。(Problems to be Solved by the Invention) However, according to the above new flare tube manufacturing method, since heat is transferred from the current heating portion to the bulge (the already-formed ridge) that has been bulged previously, If the pitch is made small, there is a problem that the already-formed peaks buckle due to the influence of the heat, and it easily falls into the unmoldable state.
また加熱後に圧縮荷重を加えるようにしているため、
加熱時間と圧縮時間とを個別に設定しなければならず、
しかも上記座屈を防止する関係上、既成形山の冷却を待
って次の山の成形に移行しなければならないという制約
があり、思うように加工能率を上げ得ないという問題も
あった。Also, since the compressive load is applied after heating,
The heating time and compression time must be set individually,
In addition, in order to prevent the above buckling, there is a restriction that it is necessary to wait for the already formed mountain to cool before shifting to the molding of the next mountain, and there is a problem that the machining efficiency cannot be increased as expected.
（問題点を解決するための手段） 本発明は上記従来の問題点を解決するため、高周波コ
イルと冷却コイルとを上下方向に並設すると共に両コイ
ルの間に磁性材料製のヨークを介装して成る加熱装置に
素管を挿入し、前記冷却コイルから該素管に向けた冷却
液を噴射しつゝ、前記高周波コイルにて該素管を局部的
に円周方向に加熱し、この加熱途中から該管端に軸方向
の荷重を加えて加熱部分を膨出させ、加熱終了とほゞ同
時に前記荷重を加えることを停止することを、所定のピ
ッチで繰り返すように構成したことを要旨とする。(Means for Solving the Problems) In order to solve the above-mentioned problems of the present invention, a high-frequency coil and a cooling coil are vertically arranged side by side, and a yoke made of a magnetic material is interposed between the coils. The element tube is inserted into the heating device comprising, and while the cooling liquid is jetted from the cooling coil toward the element tube, the element tube is locally heated in the circumferential direction by the high frequency coil, It is configured such that an axial load is applied to the tube end from the middle of heating to swell the heated portion, and at the same time as the end of heating, stopping the application of the load is repeated at a predetermined pitch. And
（作用） 上記構成のフレアチューブの製造方法において、高周
波コイルと冷却コイルとの間に磁性材料のヨークを介装
したので、高周波コイルの電流分布ピークが反ヨーク側
へ移行し、この結果、高周波コイルによる加熱部分が同
じく反ヨーク側へ移動して既成形山に対する熱影響が抑
えられるようになる。またこれと同時に冷却コイルから
噴射される冷却液により既成形山が強制的に冷却され、
上記熱影響の小さいことと相まって、成形ピッチを小さ
くしても既成形山の座屈が起こり難くなる。(Operation) In the method for manufacturing a flare tube having the above-described configuration, since the yoke of the magnetic material is interposed between the high frequency coil and the cooling coil, the current distribution peak of the high frequency coil shifts to the side opposite to the yoke, and as a result, the high frequency The heating portion by the coil also moves to the side opposite to the yoke side, so that the thermal influence on the already formed mountain can be suppressed. At the same time, the pre-formed mountain is forcibly cooled by the cooling liquid injected from the cooling coil.
Coupled with the small influence of heat described above, buckling of already formed ridges does not easily occur even if the forming pitch is reduced.
また加熱途中から軸方向の圧縮荷重を加えるようにし
たので、膨出部分が高周波コイルの内面に漸次接近し、
この結果、経時的に加熱効率が増しかつ素管の塑性変形
能が高まることとなり、加熱終了とほゞ同時に膨出成形
を終えても十分満足する膨出量が得られるようになる。
しかも、冷却コイルから冷却液により既成形山を直ちに
強制冷却することができ、連続的に次の山の成形に移行
することができて加工能率が著しく向上するようにな
る。Moreover, since a compressive load in the axial direction is applied during heating, the bulging portion gradually approaches the inner surface of the high-frequency coil,
As a result, the heating efficiency increases with time and the plastic deformability of the shell increases, so that a sufficient swelling amount can be obtained even if the swelling is completed at the same time as the heating is completed.
Moreover, the already formed ridge can be immediately and forcibly cooled by the cooling liquid from the cooling coil, and it is possible to continuously shift to the forming of the next ridge, thereby significantly improving the processing efficiency.
（実施例） 以下、本発明の実施例を添付図面にもとづいて説明す
る。(Example) Hereinafter, an example of the present invention is described based on an accompanying drawing.
第１図は、本発明にかゝるフレアチューブの製造を実
行する装置構成およびその使用態様を示したものであ
る。同図において、１は加工対象である素管、2,3は前
記素管１の管端に係合し、該素管１を上・下方向から挾
持する一対のラムで、該ラムの内の一方のラム２は上下
動できるようになっている。４は前記一対のラム2,3間
に配設された高周波コイルで、支持フレーム５に支持さ
れている。支持フレーム５は、図示を略す駆動機構によ
り上下動できるようになっており、これにはまた、前記
高周波コイル４下に位置するように、中空の冷却コイル
６がボルト７を用いて吊下支持されている。冷却コイル
６は、その内面に設けた噴射孔6aから前記素管１に向け
て冷却液８を噴射し得るもので、その後部には冷却液供
給用のヘッダー９が接続されている。また、前記高周波
コイル４と冷却コイル６との間には、磁性材料例えばフ
ェライトから成るリング状のヨーク10が介装されてい
る。FIG. 1 shows an apparatus configuration for manufacturing a flare tube according to the present invention and its usage. In the figure, 1 is a raw pipe to be processed, 2 and 3 are a pair of rams that engage with the pipe ends of the raw pipe 1 and hold the raw pipe 1 from above and below. One of the rams 2 can move up and down. Reference numeral 4 denotes a high-frequency coil arranged between the pair of rams 2 and 3 and is supported by a support frame 5. The support frame 5 can be moved up and down by a drive mechanism (not shown), and a hollow cooling coil 6 is hung and supported by bolts 7 so as to be located under the high frequency coil 4. Has been done. The cooling coil 6 is capable of injecting the cooling liquid 8 toward the raw pipe 1 from the injection hole 6a provided on the inner surface thereof, and a header 9 for supplying the cooling liquid is connected to the rear portion thereof. A ring-shaped yoke 10 made of a magnetic material such as ferrite is interposed between the high frequency coil 4 and the cooling coil 6.
かゝる装置を用いて、いま一対のラム2,3間に素管１
をセットし、支持フレーム５を移動させて高周波コイル
４を適宜位置決めする。そして、先ず冷却コイル６から
素管１に向けて冷却液８を噴射し、次に高周波コイル４
に高周波電流を印加して素管１の加熱を開始し、続いて
ラム２を下動させて素管１に軸方向の圧縮荷重を加え
る。この加熱および圧縮荷重の付与により、素管１の加
熱部分の塑性変形能が増すと共にこの部分に歪が集中
し、該加熱部分は徐々に膨出する。その後、所定時間経
過時点で、高周波コイル４に対する高周波電流の印加を
停止し、これと同時にラム２の下動を停止する。かゝる
一連の動作により前記加熱部分には所定形状の一つの山
が膨出成形される。Using such a device, the tube 1 is now between the pair of rams 2 and 3.
Is set and the support frame 5 is moved to position the high frequency coil 4 appropriately. Then, first, the cooling liquid 8 is jetted from the cooling coil 6 toward the base pipe 1, and then the high frequency coil 4 is injected.
A high-frequency current is applied to start heating of the raw tube 1, and then the ram 2 is moved downward to apply an axial compressive load to the raw tube 1. By the heating and the application of the compressive load, the plastic deformability of the heated portion of the raw tube 1 is increased and the strain is concentrated on this portion, so that the heated portion is gradually expanded. After that, when a predetermined time elapses, the application of the high frequency current to the high frequency coil 4 is stopped, and at the same time, the downward movement of the ram 2 is stopped. By such a series of operations, one peak having a predetermined shape is bulged and formed in the heating portion.
上記膨出成形完了後、支持フレーム５を所定距離だけ
上動させる。すると、赤熱状態の既成形山が冷却コイル
６から噴射されている冷却液８に触れて直ちに冷却され
る。一方前記支持フレーム５の上動により新たに位置決
めされた高周波コイル４には、再び高周波電流が印加さ
れ、その後上記動作の繰り返しにより次の山が膨出成形
され、以降所定のピッチで前記動作を繰り返えせば、所
望の山数を有するフレアチューブが得られるようにな
る。After the bulging molding is completed, the support frame 5 is moved upward by a predetermined distance. Then, the pre-molded mountain in the red hot state comes into contact with the cooling liquid 8 jetted from the cooling coil 6 and is immediately cooled. On the other hand, a high-frequency current is applied again to the high-frequency coil 4 newly positioned by the upward movement of the support frame 5, and then the next mountain is bulged by repeating the above-mentioned operation, and thereafter the above-mentioned operation is performed at a predetermined pitch. If it repeats, the flare tube which has a desired number of peaks will be obtained.
しかして、上記高周波コイル４による加熱に際し、磁
性材料から成るヨーク10の存在によって、高周波コイル
４の電流分布のピークが、第２図に点線で示すように、
反ヨーク側へ移行し、この結果、高周波コイル４による
素管１の加熱部分Ａが同じく反ヨーク側へわずか移動し
て、既成形山Ｂに対する熱の伝達が少なくなる。一方、
冷却コイル６から噴射される冷却液８により既成形山Ｂ
の温度上昇が抑えられる。したがって、従来より成形ピ
ッチを小さくしても既成形山Ｂの座屈が起こり難くな
る。これを従来の方法（特開昭59−144529号公報）であ
る第３図と対比すれば一層明らかとなる。すなわち、従
来の方法では、同図に点線で示すように、高周波コイル
４の電流分布は正規分布状となり、したがって、素管１
の加熱部分Ａが既成形山Ｂに接近し、該既成形山Ｂに対
する熱伝導が大きくなる。しかもこの場合特別の冷却手
段を持たないため、既成形山Ｂの速やかな冷却が困難と
なり、成形ピッチを小さくすることはきわめて困難とな
る。When heating by the high-frequency coil 4, the peak of the current distribution of the high-frequency coil 4 due to the presence of the yoke 10 made of a magnetic material is as shown by the dotted line in FIG.
It moves to the side opposite to the yoke, and as a result, the heated portion A of the raw tube 1 by the high-frequency coil 4 also slightly moves toward the side opposite to the yoke, and the heat transfer to the already-formed peak B is reduced. on the other hand,
Formed mountain B by cooling liquid 8 injected from cooling coil 6
Suppresses temperature rise. Therefore, even if the forming pitch is made smaller than in the conventional case, the buckling of the already formed mountain B is less likely to occur. This will become more apparent when compared with FIG. 3 which is a conventional method (Japanese Patent Laid-Open No. 59-144529). That is, in the conventional method, as indicated by the dotted line in the figure, the current distribution in the high-frequency coil 4 has a normal distribution, and therefore the tube 1
The heating portion A of the above approaches the preformed peak B, and the heat conduction to the preformed peak B increases. Moreover, in this case, since no special cooling means is provided, it is difficult to quickly cool the already formed mountain B, and it is extremely difficult to reduce the molding pitch.
また本実施例において、加熱途中から軸方向の圧縮荷
重を加えるようにしたので、膨出部分が高周波コイル４
の内面に漸次接近し、この結果、経時的に加熱効率が増
しかつ素管１の塑性変形能が高まることとなり、加熱終
了とほゞ同時に膨出成形を終えても十分満足する膨出量
が得られるようになる。Further, in this embodiment, since the axial compressive load is applied during the heating, the bulging portion has the high-frequency coil 4.
Gradually, the heating efficiency increases and the plastic deformability of the shell 1 increases with the lapse of time. As a result, a sufficient swelling amount can be obtained even if the swelling is finished at the same time as the end of heating. You will get it.
以下、本法の具体的実施例について説明する。 Hereinafter, specific examples of this method will be described.
使用素管として、JIS STKM11A、外形34mm、肉厚1.0m
m、長さ130mmのものを用い、先ず冷却コイル６から15l/
minの条件で冷却液を噴射し、続いて周波数40KHz、40KW
の発振器に結ぶ高周波コイル４にて、電圧5KV、電流7.5
Aの出力で、1.5秒間加熱した。この加熱により膨出成形
部の温度は最高1000℃まで到達した。一方、加熱開始後
1.0秒からラム２を下降速度10mm/秒の速度で下動せし
め、加熱終了と同時にラム２の下動を停止した。その直
後、支持フレーム５を上動させて既成形山を冷却コイル
６の冷却液８中に移動させた。この移動に要する時間は
１秒であった。その後、前記動作を必要な山数だけ繰り
返し、所定のフレアチューブを得た。JIS STKM11A, outer diameter 34 mm, wall thickness 1.0 m
m, length 130mm, cooling coil 6 to 15l /
Coolant is injected under the condition of min, then frequency 40KHz, 40KW
In the high frequency coil 4 connected to the oscillator, voltage 5KV, current 7.5
Heated at A power for 1.5 seconds. Due to this heating, the temperature of the bulging-molded portion reached a maximum of 1000 ° C. On the other hand, after starting heating
From 1.0 second, the ram 2 was moved downward at a descending speed of 10 mm / sec, and the lowering of the ram 2 was stopped at the same time as the heating was completed. Immediately after that, the support frame 5 was moved upward to move the preformed peak into the cooling liquid 8 of the cooling coil 6. The time required for this movement was 1 second. Then, the above operation was repeated for the required number of peaks to obtain a predetermined flare tube.
上記実施例において、一山の成形に要する時間は、加
熱1.5秒と移動１秒との合計2.5秒であり、きわめて短時
間に成形を完了させることができる。因みに特開昭59−
144529号公報に示される従来の方法によって同様の成形
を行ったところ、一山の成形に要する時間は、加熱1.5
秒と、冷却10秒と移動１秒との合計12.5秒であり、本法
の成形時間の著しく短かい（約1/5）ことが確認でき
た。In the above example, the time required for molding one mountain is 1.5 seconds for heating and 1 second for moving, which is a total of 2.5 seconds, and the molding can be completed in an extremely short time. Incidentally, JP-A-59-
When the same molding was performed by the conventional method shown in Japanese Patent No. 144529, the time required for molding one mountain was 1.5
Second, 10 seconds of cooling and 1 second of movement were a total of 12.5 seconds, and it was confirmed that the molding time of this method was extremely short (about 1/5).
一方、成形ピッチに関し、座屈を起こすことなく成形
できる最小ピッチを求めたところ、第４図に示すよう
に、本発明の方法によって得たフレアチューブT1のそれ
がp1＝9.0mmであるのに対し、従来の方法によって得た
フレアチューブT2のそれはp2＝10.5mmであり、本法の優
れていることが確認できた。On the other hand, regarding the forming pitch, the minimum pitch that can be formed without causing buckling was determined. As shown in FIG. 4, that of the flare tube T 1 obtained by the method of the present invention was p 1 = 9.0 mm. On the other hand, the flare tube T 2 obtained by the conventional method has p 2 = 10.5 mm, which confirms that the present method is excellent.
（発明の効果） 以上、詳細に説明したように、本発明にかゝるフレア
チューブの製造方法は、高周波コイルと冷却コイルとの
間に磁性材料のヨークを介装しかつまた冷却コイルから
冷却液を常時噴射するようにしたので、既成形山に対す
る加熱部分からの熱影響を抑制し得て、成形ピッチの可
及的縮小を達成できる効果が得られた。(Effects of the Invention) As described in detail above, in the method for manufacturing a flare tube according to the present invention, a yoke of a magnetic material is interposed between the high frequency coil and the cooling coil and the cooling coil is also cooled. Since the liquid is always sprayed, it is possible to suppress the thermal influence from the heating portion on the already formed mountain and to achieve the effect of achieving the possible reduction of the forming pitch.
また加熱途中から軸方向の圧縮荷重を加えるようにし
たので、加熱終了とほゞ同時に膨出成形を終えても十分
満足する膨出量が得られ、冷却コイルからの強制冷却と
相まって、一山の成形時間を著しく短縮することが可能
になり、生産性の大幅向上を達成できる効果が得られ
た。In addition, since a compressive load in the axial direction is applied during heating, a sufficient amount of swelling can be obtained even if bulging is completed at the same time as the end of heating, and in combination with forced cooling from the cooling coil It became possible to remarkably shorten the molding time, and the effect of achieving a significant improvement in productivity was obtained.
第１図は本発明にかゝるフレアチューブの製造方法を実
行する装置例を示す断面図、第２図は本法における成形
状態を示す説明図、第３図は従来の方法における成形状
態を示す説明図、第４図は本法によって得たフレアチュ
ーブの成形ピッチを従来法によって得たフレアチューブ
のそれとを対比して示す説明図である。 １…素管、４…高周波コイル ６…冷却コイル、10…ヨークFIG. 1 is a sectional view showing an example of an apparatus for carrying out the method for producing a flare tube according to the present invention, FIG. 2 is an explanatory view showing a molding state in this method, and FIG. 3 is a molding state in a conventional method. FIG. 4 is an explanatory diagram showing the molding pitch of the flare tube obtained by the present method in comparison with that of the flare tube obtained by the conventional method. 1 ... Element tube, 4 ... High frequency coil 6 ... Cooling coil, 10 ... Yoke
Claims (1)
並設すると共に両コイルの間に磁性材料製のヨークを介
装して成る加熱装置に素管を挿入し、前記冷却コイルか
ら該素管に向けて冷却液を噴射しつゝ、前記高周波コイ
ルにて該素管を局部的に円周方向に加熱し、この加熱途
中から該管端に軸方向の荷重を加えて加熱部分を膨出さ
せ、加熱終了とほゞ同時に前記荷重を加えることを停止
することを、所定のピッチで繰り返すことを特徴とする
フレアチューブの製造方法。1. An element tube is inserted into a heating device in which a high frequency coil and a cooling coil are arranged side by side in a vertical direction and a yoke made of a magnetic material is interposed between the coils, and the element is removed from the cooling coil. While the cooling liquid is jetted toward the pipe, the high-frequency coil locally heats the raw pipe in the circumferential direction, and an axial load is applied to the pipe end from the middle of the heating to expand the heated portion. A method for manufacturing a flare tube, characterized in that the heating and the end of heating and the stop of applying the load at the same time are repeated at a predetermined pitch.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3618387A JPH0829361B2 (en) | 1987-02-19 | 1987-02-19 | Flare tube manufacturing method |
| US07/124,961 US4821551A (en) | 1986-11-25 | 1987-11-24 | Method of manufacturing corrugate tube and molding apparatus thereof |
| EP87310401A EP0269433B1 (en) | 1986-11-25 | 1987-11-25 | Method of manufacturing corrugated tube and molding apparatus thereof |
| DE87310401T DE3787349T2 (en) | 1986-11-25 | 1987-11-25 | Process for producing corrugated pipes and device for carrying them out. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3618387A JPH0829361B2 (en) | 1987-02-19 | 1987-02-19 | Flare tube manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63203217A JPS63203217A (en) | 1988-08-23 |
| JPH0829361B2 true JPH0829361B2 (en) | 1996-03-27 |
Family
ID=12462615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3618387A Expired - Lifetime JPH0829361B2 (en) | 1986-11-25 | 1987-02-19 | Flare tube manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0829361B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102411005A (en) * | 2010-09-17 | 2012-04-11 | 株式会社东芝 | Cell substrate inspection system and method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2874532B2 (en) * | 1993-09-20 | 1999-03-24 | トヨタ自動車株式会社 | Corrugated tube molding method and apparatus |
-
1987
- 1987-02-19 JP JP3618387A patent/JPH0829361B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102411005A (en) * | 2010-09-17 | 2012-04-11 | 株式会社东芝 | Cell substrate inspection system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63203217A (en) | 1988-08-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |