JP3648653B2 - Nozzle for hydraulic forming - Google Patents

Nozzle for hydraulic forming Download PDF

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Publication number
JP3648653B2
JP3648653B2 JP22974196A JP22974196A JP3648653B2 JP 3648653 B2 JP3648653 B2 JP 3648653B2 JP 22974196 A JP22974196 A JP 22974196A JP 22974196 A JP22974196 A JP 22974196A JP 3648653 B2 JP3648653 B2 JP 3648653B2
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slide member
nozzle
molding
cylindrical portion
seal ring
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JPH1071433A (en
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八州治 波多野
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Calsonic Kansei Corp
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Calsonic Kansei Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/045—Closing or sealing means

Description

【０００１】
【発明の属する技術分野】
本発明は、パイプにバルジ加工を施す場合等に適用される液圧成形で使用するノズルの技術分野に属する。
【０００２】
【従来の技術】
パイプを液圧成形する場合には、被成形用パイプの内部に成形液を密封する必要があるため、被成形用パイプの端部の閉塞の仕方に種々の工夫を施している。そのうちのひとつとして、図６に示すように、ノズル１００の嵌合部１０１を被成形用パイプＰの端部内側に嵌合させると共に、ビード２０１を有する外型２００を前記被成形用パイプＰの端部外側に設け、この外型２００のビード２０１を被成形用パイプＰの端部外周面に食い込ませることにより被成形用パイプＰの内周面とノズル１００の嵌合部１０１の外周面との密着性を高めようとする従来技術▲１▼がある。
【０００３】
また、別の従来技術として、特開平６−３２８１５８号公報（図７参照）に記載されているように、ノズル３００の嵌合部３０１の先端にスライド部材３０２を設けると共に、このスライド部材３０２と嵌合部３０１との間にシールリング３０３を設け、スライド部材３０２をシリンダー４００で駆動することにより前記シールリング３０３を圧縮変形させて被成形用パイプＰの内周面に密着させる従来技術▲２▼がある。
【０００４】
【発明が解決しようとする課題】
ところが、従来技術▲１▼では、被成形用パイプとノズルとの密着性が十分に得られず、液洩れ防止が不完全であるという問題があった。
【０００５】
また、従来技術▲２▼では、スライド部材を駆動するために駆動手段（シリンダー）が必要であったために、非常に機構が複雑になるという問題があった。
【０００６】
本発明が解決しようとする課題は、パイプを液圧成形する際の液洩れを、駆動手段を用いない簡単な機構の液圧成形用ノズルで確実に防止することにある。
【０００７】
【課題を解決するための手段】
（解決手段１）
上記課題の解決手段１（請求項１）は、被成形用パイプの端部内側に嵌合させる嵌合部と、該嵌合部の一端に設けられている頭部と、で構成されていて、被成形用パイプに噴出させる成形液の通路となる成形液噴出孔が設けられている液圧成形用ノズルにおいて、
前記嵌合部が、前記頭部に固定されている嵌合軸部と、この嵌合軸部の外周をその軸方向にスライド可能に設けられているスライド部材と、で構成され、
前記嵌合軸部が、外径が異なる第１円筒部と第２円筒部と第３円筒部を有した先細り形状に形成され、
前記スライド部材が、最も外径が小さい前記第１円筒部と係合している内径小部と、次に外径が小さい前記第２円筒部と係合している内径大部を有した円筒状に形成され、
前記嵌合軸部の第３円筒部と前記スライド部材の内径大部との間に、前記スライド部材による押圧力で圧縮変形して被成形用パイプの内周面に密着するシールリングが設けられ、
前記嵌合軸部の第２円筒部と前記スライド部材の内径大部との間に、圧抜き孔を通して大気圧となっている大気圧室が設けられていることを特徴とする。
【０００８】
（解決手段２）
上記課題の解決手段２（請求項２）は、請求項１記載の液圧成形用ノズルにおいて、前記嵌合軸部の第１円筒部と前記スライド部材の内径小部との間にシールリングが設けられていると共に、前記嵌合軸部の第２円筒部と前記スライド部材の内径大部との間にシールリングが設けられていることを特徴とする。
【０００９】
【発明の実施の形態】
（実施の形態１）
実施の形態１は、解決手段１ならびに解決手段２に対応する液圧成形用ノズルである。
【００１０】
図１は実施の形態１の液圧成形用ノズルを示す一部断面側面図で、まず、図１に基づいて、液圧成形用ノズルＮの構成について説明する。
【００１１】
前記液圧成形用ノズルＮは、被成形用パイプＰの端部内側に嵌合させる嵌合部１と、その嵌合部１の一端に設けられている頭部２と、で構成されていて、被成形用パイプＰに噴出させる成形液の通路となる成形液噴出孔３が軸心に貫通して設けられている。
【００１２】
前記嵌合部１は、前記頭部２と一体成形されている嵌合軸部１１と、この嵌合軸部１１の外周をその軸方向にスライド可能に設けられているスライド部材１２とで構成されていて、前記嵌合軸部１１は、外径が異なる３つの円筒部（以下、外径が小さい順に第１円筒部１１１、第２円筒部１１２、第３円筒部１１３とする）によって先細り円筒状に形成されており、前記スライド部材１２は、前記嵌合軸部１１の第１円筒部１１１と係合している内径小部１２１と、前記嵌合軸部１１の第２円筒部１１２と係合している内径大部１２２とで円筒状に形成されている。
【００１３】
また、前記嵌合軸部１１は、スナップリング４が装着された溝１１４を第１円筒部１１１の先端部外周に有し、Ｏ−リング５が装着された溝１１５を第２円筒部１１２の外周に有しており、前記スナップンング４によってスライド部材１２の脱落を防止し、前記Ｏ−リング５によって、嵌合軸部１１の第２円筒部１１２とスライド部材１２の内径大部１２２との間の密閉性を確保している。
【００１４】
前記スライド部材１２は、Ｏ−リング６が装着された溝１２３を前記内径小部１２１の内周に有しており、このＯ−リング６によって、前記嵌合軸部１１の第１円筒部１１１とスライド部材１２の内径小部１２１との間の密閉性を確保している。また、前記スライド部材１２は、前記内径大部１２２の外周が、前記嵌合軸部１１の第３円筒部１１３の外径と同径の一定外径に形成されており、前記内径小部１２１の外周が、先端に向けて縮径するテーパ状に形成されている。
【００１５】
また、前記嵌合軸部１１とスライド部材１２との間には、圧抜き孔７を通して頭部２の外側の大気と連通した大気圧室８が設けられている。
【００１６】
更に、前記嵌合軸部１１の第３円筒部１１３と前記スライド部材１２の内径大部１２２の間には、スライド部材１２からの圧力で圧縮変形して被成形用パイプの内周面に密着するシールリング９が設けられている。このシールリング９は、ゴムや樹脂やウレタン等の弾性体で形成されており、外径が、非圧縮状態では前記第３円筒部１１３ならびに前記内径大部１２２の外径よりも小さく、圧縮状態では前記第３円筒部１１３ならびに前記内径大部１２２の外径よりも大きくなるようになっている。また、このシールリング９は、嵌合軸部１１の第２円筒部１１２の外周面ならびに第１円筒部１１１の前面とスライド部材１２の後端面にそれぞれ密着する面を有する断面長方形に形成されている。
【００１７】
図２ならびに図３は実施の形態１の液圧成形用ノズルＮを被成形用パイプＰの端部に嵌合させた状態を示す図で、図２は被成形用パイプＰに成形液Ｗを噴出させる前の状態を示し、図３は被成形用パイプＰに成形液Ｗを噴出させた状態を示している。
【００１８】
まず、被成形用パイプＰに成形液Ｗを噴出させる前の状態では、被成形用パイプＰの閉塞空間の内圧が大気圧に近く大気圧室８の内圧とほとんど差がないので、スライド部材１２には、シールリング９を圧縮させるだけの圧力が作用しない。つまり、シールリング９は、外径が第３円筒部１１３ならびに前記内径大部１２１の外径よりも小さい状態が維持されている。
【００１９】
したがって、この状態で被成形用パイプＰ内に成形液噴出孔３から成形液Ｗを噴出し始めると、最初は、圧縮成形用ノズルＮの嵌合部１の外周面と被成形用パイプＰの内周面との間の隙間から成形液Ｗが洩れることがある。しかし、成形液Ｗを洩れ量よりも早い速度で被成形用パイプＰ内に噴出することにより、被成形用パイプＰの閉塞空間の内圧が徐々に上昇するので、被成形用パイプＰの閉塞空間と大気圧室８との間に差圧が生じ、その差圧によってスライド部材１２がシールリング９を圧縮する方向にスライドする。そしてスライド部材１２によって圧縮されたシールリング９は、外径が第３円筒部１１３ならびに前記内径大部１２１の外径よりも大きくなって被成形用パイプＰの内周面に密着する。なお、前記シールリング９は、嵌合軸部１１の第２円筒部１１２の外周面ならびに第１円筒部１１１の前面とスライド部材１２の後端面にそれぞれ密着する面を有する断面長方形であるので、シールリング９は、弾性変形量に対して高い比率で外径が大きくなって被成形用パイプＰの内周面と密着するので、迅速に液洩れを防止できる。
【００２０】
シールリング９が被成形用パイプＰの内周面に密着すると、被成形用パイプＰの閉塞空間の内圧が更に大きくなるので、シールリング９は更にスライド部材１２によって圧縮され、被成形用パイプＰの内周面との密着性を高める。これにより、被成形用パイプＰ内の成形液Ｗを完全に密封することができる。
【００２１】
このように、本実施の形態１では、成形液Ｗの噴出時に被成形用パイプＰの閉塞空間と大気圧室８との間に生じる差圧を利用して被成形用パイプＰ内に成形液Ｗを密封することができるので、駆動手段を用いない簡単な機構の液圧成形用ノズルＮでありながら、被成形用パイプＰを液圧成形する際の液洩れを確実に防止することができるという効果が得られる。
【００２２】
また、被成形用パイプＰの端部内側に嵌合される嵌合軸部１１とスライド部材１２との間には、２つのＯ−リング５，６が大気圧室８を挟むようにして設けられているので、被成形用パイプＰに噴出した成形液Ｗが大気圧室８に浸入するのを確実に防止することもできる。
【００２３】
更に、シールリング９は、非圧縮状態では外径が第３円筒部１１３ならびに前記内径大部１２１の外径よりも小さいものを使用したので、被成形用パイプＰの端部に嵌合させる際に、シールリング９が被成形用パイプＰの内周面と擦れ合って摩耗したり傷付いたりしない。
【００２４】
（その他の実施の形態）
実施の形態１では、断面形状が長方形のシールリング９を用いたが、シールリングの断面形状は長方形に限定されない。例えば、図４に示すように、スライド部材１２の内径大部１２２の後端面１２２ａを外側に傾いた傾斜面にすると共に、シールリング９ａの断面形状を、この後端面１２２ａに対応した傾斜面を有する台形形状にし、シールリング９ａがスライド部材１２のスライド時に、その後端面１２２ａによって外側に押し上げられるようにしてもよい。そうすることにより、被成形用パイプＰの閉塞空間と大気圧室８間の差圧が小さい時でもシールリング９ａが被成形用パイプＰの内周面と密着し易くなる。また、図５に示すように、シールリング９ｂに断面円形のＯ−リングを用い、コストの削減を図るようにしてもよい。
【００２５】
【発明の効果】
請求項１記載の発明にあっては、被成形用パイプの端部内側に嵌合させる嵌合部と、該嵌合部の一端に設けられている頭部と、で構成されていて、被成形用パイプに噴出させる成形液の通路となる成形液噴出孔が設けられている液圧成形用ノズルにおいて、前記嵌合部が、前記頭部に固定されている嵌合軸部と、この嵌合軸部の外周をその軸方向にスライド可能に設けられているスライド部材と、で構成され、前記嵌合軸部が、外径が異なる第１円筒部と第２円筒部と第３円筒部を有した先細り形状に形成され、前記スライド部材が、最も外径が小さい前記第１円筒部と係合している内径小部と、次に外径が小さい前記第２円筒部と係合している内径大部を有した円筒状に形成され、前記嵌合軸部の第３円筒部と前記スライド部材の内径大部との間に、前記スライド部材による押圧力で圧縮変形して被成形用パイプの内周面に密着するシールリングが設けられ、前記嵌合軸部の第２円筒部と前記スライド部材の内径大部との間に、圧抜き孔を通して頭部の外側の大気と連通している大気圧室が設けられている構造としたため、成形液の噴出時に被成形用パイプの閉塞空間と大気圧室との間に生じる差圧を利用して被成形用パイプ内に成形液を密封することができるので、駆動手段を用いない簡単な機構の液圧成形用ノズルでありながら、被成形用パイプを液圧成形する際の液洩れを確実に防止することができるという効果が得られる。
【００２６】
請求項２記載の発明にあっては、請求項１記載の液圧成形用ノズルにおいて、嵌合軸部の第１円筒部と前記スライド部材の内径小部との間にシールリングが設けられていると共に、前記嵌合軸部の第２円筒部と前記スライド部材の内径大部との間にシールリングが設けられている構造としたので、被成形用パイプの端部内側に嵌合される嵌合軸部とスライド部材との間には、２つのシールリングが大気圧室を挟むようにして設けられていることになり、上記効果に加え、被成形用パイプに噴出した成形液が大気圧室に浸入するのを確実に防止することができるという効果が得られる。
【００２７】
請求項３記載の発明にあっては、請求項１記載の液圧成形用ノズルならびに請求項２記載の液圧成形用ノズルにおいて、前記シールリングが、嵌合軸部の第２円筒部の外周面ならびに第１円筒部の前面とスライド部材の後端面にそれぞれ密着する面を有する断面長方形であるので、シールリングは、弾性変形量に対して高い比率で外径が大きくなり被成形用パイプの内周面と密着するので、迅速に液洩れを防止できるという効果が得られる。
【００２８】
請求項４記載の発明にあっては、請求項１記載の液圧成形用ノズルならびに請求項２記載の液圧成形用ノズルにおいて、スライド部材の内径大部の後端面が外側に傾いた傾斜面であると共に、シールリングが、この後端面に対応した傾斜面を有する断面台形であるので、被成形用パイプの閉塞空間と大気圧室間の差圧が小さい時でもシールリングを被成形用パイプの内周面と密着させることができ、より確実に液洩れを防止することができるという効果が得られる。
【００２９】
請求項５記載の発明にあっては、請求項１記載の液圧成形用ノズルにおいて、請求項１記載の液圧成形用ノズルならびに請求項２記載の液圧成形用ノズルにおいて、前記シールリングが断面円形であるので、コストの削減を図ることができるという効果が得られる。
【図面の簡単な説明】
【図１】実施の形態１の液圧成形用ノズルを示す一部断面側面図である。
【図２】実施の形態１の液圧成形用ノズルを被成形用パイプの端部に嵌合させた状態を示す断面図である。
【図３】実施の形態１の液圧成形用ノズルを被成形用パイプの端部に嵌合させた状態を示す断面図である。
【図４】その他の実施の形態の液圧成形用ノズルを示す一部断面側面図である。
【図５】その他の実施の形態の液圧成形用ノズルを示す一部断面側面図である。
【図６】従来技術▲１▼の液圧成形用ノズルを示す断面図である。
【図７】従来技術▲２▼の液圧成形用ノズルを示す断面図である。
【符号の説明】
Ｐ 被成形用パイプ
Ｎ 液圧成形用ノズル
１ 嵌合部
１１ 嵌合軸部
１１１ 第１円筒部
１１２ 第２円筒部
１１３ 第３円筒部
１２ スライド部材
１２１ 内径大部
１２２ 内径小部
２ 頭部
３ 成形液噴出孔
４ スナップリング
５ Ｏ−リング（シールリング）
６ Ｏ−リング（シールリング）
７ 圧抜き孔
８ 大気圧室
９ シールリング[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of nozzles used in hydraulic forming applied when bulging a pipe.
[0002]
[Prior art]
When the pipe is formed by hydraulic pressure, it is necessary to seal the forming liquid inside the pipe to be formed, and therefore various measures are taken in the manner of closing the end of the pipe to be formed. As one of them, as shown in FIG. 6, the fitting portion 101 of the nozzle 100 is fitted inside the end portion of the pipe P for molding, and the outer mold 200 having the beads 201 is attached to the pipe P for molding. An outer peripheral surface of the pipe P for molding and the outer peripheral surface of the fitting portion 101 of the nozzle 100 are provided on the outer side of the end portion, and the bead 201 of the outer mold 200 bites into the outer peripheral surface of the end portion of the pipe P for molding. There is a conventional technique {circle around (1)} that attempts to improve the adhesion of the film.
[0003]
As another prior art, as described in Japanese Patent Laid-Open No. 6-328158 (see FIG. 7), a slide member 302 is provided at the tip of the fitting portion 301 of the nozzle 300, and the slide member 302 Conventional technology (2) in which a seal ring 303 is provided between the fitting portion 301 and the slide member 302 is driven by a cylinder 400 so that the seal ring 303 is compressed and deformed to be in close contact with the inner peripheral surface of the molding pipe P. There is ▼.
[0004]
[Problems to be solved by the invention]
However, the prior art {circle around (1)} has a problem in that sufficient adhesion between the molding pipe and the nozzle cannot be obtained, and liquid leakage prevention is incomplete.
[0005]
Further, in the prior art (2), since a driving means (cylinder) is required to drive the slide member, there is a problem that the mechanism becomes very complicated.
[0006]
The problem to be solved by the present invention is to surely prevent the liquid leakage during the hydraulic forming of the pipe with the hydraulic forming nozzle having a simple mechanism without using the driving means.
[0007]
[Means for Solving the Problems]
(Solution 1)
Means for solving the above problem 1 (Claim 1) is constituted by a fitting portion to be fitted inside the end portion of the molding pipe, and a head portion provided at one end of the fitting portion. In a hydraulic forming nozzle provided with a molding liquid ejection hole that becomes a passage of a molding liquid to be ejected to a molding pipe,
The fitting portion is composed of a fitting shaft portion fixed to the head portion, and a slide member provided so that the outer periphery of the fitting shaft portion is slidable in the axial direction.
The fitting shaft portion is formed in a tapered shape having a first cylindrical portion, a second cylindrical portion, and a third cylindrical portion having different outer diameters,
A cylinder in which the slide member has a small inner diameter portion engaged with the first cylindrical portion having the smallest outer diameter, and a large inner diameter portion engaged with the second cylindrical portion having the next smallest outer diameter. Formed into a shape,
Between the third cylindrical portion of the fitting shaft portion and the large inner diameter portion of the slide member, there is provided a seal ring that is compressed and deformed by the pressing force of the slide member and is in close contact with the inner peripheral surface of the molding pipe. ,
An atmospheric pressure chamber that is at atmospheric pressure through a pressure release hole is provided between the second cylindrical portion of the fitting shaft portion and the inner diameter large portion of the slide member.
[0008]
(Solution 2)
The solution 2 (Claim 2) of the above-described problem is the hydraulic forming nozzle according to Claim 1, wherein a seal ring is provided between the first cylindrical portion of the fitting shaft portion and the small inner diameter portion of the slide member. And a seal ring is provided between the second cylindrical portion of the fitting shaft portion and the large inner diameter portion of the slide member.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
The first embodiment is a hydraulic forming nozzle corresponding to the solving means 1 and the solving means 2.
[0010]
FIG. 1 is a partial cross-sectional side view showing the hydraulic forming nozzle of the first embodiment. First, the configuration of the hydraulic forming nozzle N will be described with reference to FIG.
[0011]
The hydroforming nozzle N is composed of a fitting portion 1 that is fitted inside the end portion of the pipe P to be molded, and a head portion 2 that is provided at one end of the fitting portion 1. A molding liquid ejection hole 3 serving as a passage for the molding liquid ejected to the molding pipe P is provided through the shaft.
[0012]
The fitting portion 1 includes a fitting shaft portion 11 that is integrally formed with the head portion 2 and a slide member 12 that is provided on the outer periphery of the fitting shaft portion 11 so as to be slidable in the axial direction. The fitting shaft portion 11 is tapered by three cylindrical portions having different outer diameters (hereinafter referred to as a first cylindrical portion 111, a second cylindrical portion 112, and a third cylindrical portion 113 in order of decreasing outer diameter). The slide member 12 is formed in a cylindrical shape, and includes a small inner diameter portion 121 engaged with the first cylindrical portion 111 of the fitting shaft portion 11 and a second cylindrical portion 112 of the fitting shaft portion 11. And is formed in a cylindrical shape with a large inner diameter portion 122 engaged therewith.
[0013]
The fitting shaft portion 11 has a groove 114 in which the snap ring 4 is mounted on the outer periphery of the distal end portion of the first cylindrical portion 111, and a groove 115 in which the O-ring 5 is mounted on the second cylindrical portion 112. The slide member 12 is prevented from falling off by the snapping 4, and the second cylindrical portion 112 of the fitting shaft portion 11 and the large inner diameter portion 122 of the slide member 12 are formed by the O-ring 5. The airtightness between is secured.
[0014]
The slide member 12 has a groove 123 in which the O-ring 6 is mounted on the inner periphery of the small inner diameter portion 121, and the first cylindrical portion 111 of the fitting shaft portion 11 is formed by the O-ring 6. And a sealing property between the small inner diameter portion 121 of the slide member 12 are ensured. Further, the slide member 12 has an outer periphery of the large inner diameter portion 122 formed to have a constant outer diameter that is the same as the outer diameter of the third cylindrical portion 113 of the fitting shaft portion 11, and the small inner diameter portion 121. The outer periphery of each is formed in a taper shape with a diameter reduced toward the tip.
[0015]
Further, an atmospheric pressure chamber 8 communicating with the atmosphere outside the head 2 through the pressure release hole 7 is provided between the fitting shaft portion 11 and the slide member 12.
[0016]
Further, between the third cylindrical portion 113 of the fitting shaft portion 11 and the inner diameter large portion 122 of the slide member 12, it is compressed and deformed by the pressure from the slide member 12 and is in close contact with the inner peripheral surface of the molding pipe. A sealing ring 9 is provided. The seal ring 9 is formed of an elastic body such as rubber, resin, or urethane, and has an outer diameter that is smaller than the outer diameter of the third cylindrical portion 113 and the large inner diameter portion 122 in a non-compressed state. Then, it becomes larger than the outer diameter of the third cylindrical portion 113 and the large inner diameter portion 122. In addition, the seal ring 9 is formed in a rectangular cross section having a surface that closely contacts the outer peripheral surface of the second cylindrical portion 112 of the fitting shaft portion 11 and the front surface of the first cylindrical portion 111 and the rear end surface of the slide member 12. Yes.
[0017]
2 and 3 are views showing a state in which the hydraulic pressure forming nozzle N of Embodiment 1 is fitted to the end of the pipe P for molding, and FIG. 2 shows the molding liquid W applied to the pipe P for molding. FIG. 3 shows a state before the ejection, and FIG. 3 shows a state where the molding liquid W is ejected to the molding pipe P.
[0018]
First, in a state before the molding liquid W is ejected to the molding pipe P, the internal pressure of the closed space of the molding pipe P is close to the atmospheric pressure and is not substantially different from the internal pressure of the atmospheric pressure chamber 8. The pressure sufficient to compress the seal ring 9 does not act on the. That is, the seal ring 9 is maintained in a state where the outer diameter is smaller than the outer diameter of the third cylindrical portion 113 and the large inner diameter portion 121.
[0019]
Accordingly, when the molding liquid W starts to be ejected from the molding liquid ejection hole 3 into the molding pipe P in this state, the outer peripheral surface of the fitting portion 1 of the compression molding nozzle N and the molding pipe P are initially set. The molding liquid W may leak from the gap between the inner peripheral surface. However, since the molding liquid W is ejected into the molding pipe P at a speed faster than the leakage amount, the internal pressure of the molding space of the molding pipe P gradually increases. And the atmospheric pressure chamber 8 generate a differential pressure, and the slide member 12 slides in a direction in which the seal ring 9 is compressed by the differential pressure. The seal ring 9 compressed by the slide member 12 has an outer diameter larger than the outer diameters of the third cylindrical portion 113 and the inner diameter large portion 121 and is in close contact with the inner peripheral surface of the molding pipe P. The seal ring 9 has a rectangular cross section having a surface that closely contacts the outer peripheral surface of the second cylindrical portion 112 of the fitting shaft portion 11 and the front surface of the first cylindrical portion 111 and the rear end surface of the slide member 12. Since the outer diameter of the seal ring 9 increases at a high ratio with respect to the amount of elastic deformation and comes into close contact with the inner peripheral surface of the molding pipe P, liquid leakage can be prevented quickly.
[0020]
When the seal ring 9 comes into close contact with the inner peripheral surface of the molding pipe P, the internal pressure in the closed space of the molding pipe P further increases, so that the sealing ring 9 is further compressed by the slide member 12 and the molding pipe P Increases the adhesion with the inner peripheral surface of. Thereby, the molding liquid W in the pipe P for molding can be completely sealed.
[0021]
As described above, in the first embodiment, the molding liquid is formed in the molding pipe P by utilizing the differential pressure generated between the closed space of the molding pipe P and the atmospheric pressure chamber 8 when the molding liquid W is ejected. Since W can be sealed, it is possible to reliably prevent liquid leakage when the pipe P to be molded is formed by hydraulic forming, even though it is a hydraulic forming nozzle N having a simple mechanism that does not use driving means. The effect is obtained.
[0022]
Further, two O-rings 5 and 6 are provided between the fitting shaft portion 11 fitted inside the end portion of the pipe P to be molded and the slide member 12 so as to sandwich the atmospheric pressure chamber 8. Therefore, it is possible to reliably prevent the molding liquid W ejected from the molding pipe P from entering the atmospheric pressure chamber 8.
[0023]
Furthermore, since the seal ring 9 used in the non-compressed state has an outer diameter smaller than the outer diameters of the third cylindrical portion 113 and the inner diameter large portion 121, when the seal ring 9 is fitted to the end of the pipe P for molding. Moreover, the seal ring 9 does not rub against the inner peripheral surface of the molding pipe P and is not worn or damaged.
[0024]
(Other embodiments)
In Embodiment 1, the seal ring 9 having a rectangular cross-sectional shape is used, but the cross-sectional shape of the seal ring is not limited to a rectangular shape. For example, as shown in FIG. 4, the rear end surface 122a of the large inner diameter portion 122 of the slide member 12 is an inclined surface inclined outward, and the cross-sectional shape of the seal ring 9a is an inclined surface corresponding to the rear end surface 122a. The sealing ring 9a may be pushed upward by the rear end face 122a when the sliding member 12 slides. By doing so, even when the pressure difference between the closed space of the molding pipe P and the atmospheric pressure chamber 8 is small, the seal ring 9a can be easily adhered to the inner peripheral surface of the molding pipe P. Further, as shown in FIG. 5, an O-ring having a circular cross section may be used for the seal ring 9b to reduce the cost.
[0025]
【The invention's effect】
In the invention of claim 1, the fitting portion is configured to be fitted inside the end portion of the pipe to be molded, and a head portion provided at one end of the fitting portion. In a hydraulic forming nozzle provided with a forming liquid ejection hole that serves as a passage for forming liquid to be injected into the forming pipe, the fitting portion includes a fitting shaft portion fixed to the head and the fitting. And a slide member provided to be slidable in the axial direction on the outer periphery of the shaft portion, and the fitting shaft portion includes a first cylindrical portion, a second cylindrical portion, and a third cylindrical portion having different outer diameters. The slide member is engaged with the second cylindrical portion having the smallest outer diameter and the second cylindrical portion having the next smallest outer diameter. A third cylindrical portion of the fitting shaft portion and a large inner diameter portion of the slide member. Between the second cylindrical portion of the fitting shaft portion and the large inner diameter portion of the slide member. Between the closed space of the pipe for molding and the atmospheric pressure chamber when the molding liquid is ejected, so that the atmospheric pressure chamber communicating with the atmosphere outside the head through the pressure release hole is provided. The molding liquid can be sealed in the molding pipe using the differential pressure generated between them, so that the molding pipe can be hydraulic The effect that the liquid leakage at the time of shaping | molding can be prevented reliably is acquired.
[0026]
According to a second aspect of the present invention, in the hydraulic forming nozzle according to the first aspect, a seal ring is provided between the first cylindrical portion of the fitting shaft portion and the small inner diameter portion of the slide member. In addition, since a seal ring is provided between the second cylindrical portion of the fitting shaft portion and the large inner diameter portion of the slide member, the seal ring is fitted inside the end portion of the pipe to be molded. Between the fitting shaft portion and the slide member, two seal rings are provided so as to sandwich the atmospheric pressure chamber. In addition to the above effects, the molding liquid ejected to the molding pipe is in the atmospheric pressure chamber. The effect that it can prevent reliably entering into is obtained.
[0027]
According to a third aspect of the present invention, in the hydraulic forming nozzle according to the first aspect and the hydraulic forming nozzle according to the second aspect, the seal ring is an outer periphery of the second cylindrical portion of the fitting shaft portion. The seal ring has a rectangular cross section having a surface and a surface that is in close contact with the front surface of the first cylindrical portion and the rear end surface of the slide member. Therefore, the outer diameter of the seal ring increases at a high ratio with respect to the amount of elastic deformation. Since it is in close contact with the inner peripheral surface, it is possible to quickly prevent liquid leakage.
[0028]
In the invention according to claim 4, the nozzle for hydraulic forming according to claim 1 and the nozzle for hydraulic forming according to claim 2 are inclined surfaces in which the rear end surface of the large inner diameter portion of the slide member is inclined outward. In addition, since the seal ring has a trapezoidal cross section having an inclined surface corresponding to the rear end surface, the seal ring can be formed even when the pressure difference between the closed space of the molding pipe and the atmospheric pressure chamber is small. It is possible to obtain an effect that liquid leakage can be prevented more reliably.
[0029]
According to a fifth aspect of the present invention, in the hydraulic molding nozzle according to the first aspect, in the hydraulic molding nozzle according to the first aspect and in the hydraulic molding nozzle according to the second aspect, the seal ring includes the seal ring. Since the cross section is circular, the effect of reducing cost can be obtained.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional side view showing a hydraulic forming nozzle according to a first embodiment.
FIG. 2 is a cross-sectional view showing a state in which the hydraulic forming nozzle according to the first embodiment is fitted to the end of the pipe to be formed.
FIG. 3 is a cross-sectional view showing a state in which the hydraulic forming nozzle according to the first embodiment is fitted to the end of the pipe to be formed.
FIG. 4 is a partial cross-sectional side view showing a hydroforming nozzle according to another embodiment.
FIG. 5 is a partial cross-sectional side view showing a hydraulic forming nozzle according to another embodiment.
FIG. 6 is a cross-sectional view showing a hydraulic forming nozzle of prior art {circle around (1)}.
FIG. 7 is a cross-sectional view showing a hydraulic forming nozzle according to prior art (2).
[Explanation of symbols]
P Pipe to be molded N Hydraulic forming nozzle 1 Fitting portion 11 Fitting shaft portion 111 First cylindrical portion 112 Second cylindrical portion 113 Third cylindrical portion 12 Slide member 121 Large inner diameter 122 Small inner diameter 2 Head 3 Molding liquid ejection hole 4 Snap ring 5 O-ring (seal ring)
6 O-ring (seal ring)
7 Pressure release hole 8 Atmospheric pressure chamber 9 Seal ring

Claims (5)

被成形用パイプ（Ｐ）の端部内側に嵌合させる嵌合部（１）と、該嵌合部（１）の一端に設けられている頭部（２）と、で構成されていて、被成形用パイプ（Ｐ）に噴出させる成形液の通路となる成形液噴出孔（３）が設けられている液圧成形用ノズル（Ｎ）において、
前記嵌合部（１）が、前記頭部（２）に固定されている嵌合軸部（１１）と、この嵌合軸部（１１）の外周をその軸方向にスライド可能に設けられているスライド部材（１２）と、で構成され、
前記嵌合軸部（１１）が、外径が異なる第１円筒部（１１１）と第２円筒部（１１２）と第３円筒部（１１３）を有した先細り形状に形成され、
前記スライド部材（１２）が、最も外径が小さい前記第１円筒部（１１１）と係合している内径小部（１２１）と、次に外径が小さい前記第２円筒部（１１２）と係合している内径大部（１２２）を有した円筒状に形成され、
前記嵌合軸部（１１）の第３円筒部（１１３）と前記スライド部材（１２）の内径大部（１２２）の間に、前記スライド部材（１２）による押圧力で圧縮変形して被成形用パイプ（Ｐ）の内周面に密着するシールリング（９）が設けられ、
前記嵌合軸部（１１）の第２円筒部（１１２）と前記スライド部材（１２）の内径大部（１２２）との間に、圧抜き孔（７）を通して大気圧となっている大気圧室（８）が設けられていることを特徴とする液圧成形用ノズル。It is comprised by the fitting part (1) fitted in the edge part inner side of the pipe for molding (P), and the head (2) provided in the end of this fitting part (1), In the hydroforming nozzle (N) provided with the molding liquid ejection hole (3) that becomes the passage of the molding liquid to be ejected to the molding pipe (P),
The fitting portion (1) is provided so that the fitting shaft portion (11) fixed to the head portion (2) and the outer periphery of the fitting shaft portion (11) are slidable in the axial direction. A slide member (12),
The fitting shaft portion (11) is formed in a tapered shape having a first cylindrical portion (111), a second cylindrical portion (112), and a third cylindrical portion (113) having different outer diameters,
The slide member (12) has a small inner diameter portion (121) engaged with the first cylindrical portion (111) having the smallest outer diameter, and the second cylindrical portion (112) with the next smallest outer diameter. Formed into a cylindrical shape having a large inner diameter portion (122) engaged;
Between the third cylindrical part (113) of the fitting shaft part (11) and the large inner diameter part (122) of the slide member (12), it is compressed and deformed by the pressing force of the slide member (12). A seal ring (9) is provided in close contact with the inner peripheral surface of the pipe (P) for use;
An atmospheric pressure that is at atmospheric pressure through a pressure release hole (7) between the second cylindrical portion (112) of the fitting shaft portion (11) and the large inner diameter portion (122) of the slide member (12). A nozzle for hydroforming, characterized in that a chamber (8) is provided. 前記嵌合軸部（１１）の第１円筒部（１１１）と前記スライド部材（１２）の内径小部（１２１）との間にシールリング（６）が設けられていると共に、前記嵌合軸部（１１）の第２円筒部（１１２）と前記スライド部材（１２）の内径大部（１２２）との間にシールリング（５）が設けられていることを特徴とする請求項１記載の液圧成形用ノズル。A seal ring (6) is provided between the first cylindrical portion (111) of the fitting shaft portion (11) and the small inner diameter portion (121) of the slide member (12), and the fitting shaft The seal ring (5) is provided between the second cylindrical part (112) of the part (11) and the large inner diameter part (122) of the slide member (12). Nozzle for hydroforming. 請求項１記載の液圧成形用ノズルならびに請求項２記載の液圧成形用ノズルにおいて、前記シールリング（９）が、嵌合軸部（１１）の第２円筒部（１１２）の外周面ならびに第１円筒部（１１１）の前面とスライド部材（１２）の後端面にそれぞれ密着する面を有する断面長方形であることを特徴とする液圧成形用ノズル。The hydraulic molding nozzle according to claim 1 and the hydraulic molding nozzle according to claim 2, wherein the seal ring (9) includes an outer peripheral surface of the second cylindrical portion (112) of the fitting shaft portion (11), and A nozzle for hydraulic forming, which has a rectangular cross section having surfaces that are in close contact with the front surface of the first cylindrical portion (111) and the rear end surface of the slide member (12). 請求項１記載の液圧成形用ノズルならびに請求項２記載の液圧成形用ノズルにおいて、スライド部材（１２）の内径大部（１２２）の後端面（１２２ａ）が外側に傾いた傾斜面であると共に、シールリング（９ａ）が、この後端面（１２２ａ）に対応した傾斜面を有する断面台形であることを特徴とする液圧成形用ノズル。The nozzle for hydraulic molding according to claim 1 and the nozzle for hydraulic molding according to claim 2, wherein the rear end surface (122a) of the large inner diameter portion (122) of the slide member (12) is an inclined surface inclined outward. A hydroforming nozzle characterized in that the seal ring (9a) has a trapezoidal cross section having an inclined surface corresponding to the rear end surface (122a). 請求項１記載の液圧成形用ノズルならびに請求項２記載の液圧成形用ノズルにおいて、前記シールリング（９ｂ）が断面円形であることを特徴とする液体成形用ノズル。The nozzle for hydraulic molding according to claim 1 and the nozzle for hydraulic molding according to claim 2, wherein the seal ring (9b) has a circular cross section.
JP22974196A 1996-08-30 1996-08-30 Nozzle for hydraulic forming Expired - Fee Related JP3648653B2 (en)

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