JP3584697B2 - Manufacturing method for heterogeneous pipe joints - Google Patents
Manufacturing method for heterogeneous pipe joints Download PDFInfo
- Publication number
- JP3584697B2 JP3584697B2 JP25159697A JP25159697A JP3584697B2 JP 3584697 B2 JP3584697 B2 JP 3584697B2 JP 25159697 A JP25159697 A JP 25159697A JP 25159697 A JP25159697 A JP 25159697A JP 3584697 B2 JP3584697 B2 JP 3584697B2
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- Japan
- Prior art keywords
- resin
- metal part
- manufacturing
- sealing material
- injection
- 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
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- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Joints With Sleeves (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、金属部と樹脂部からなる異種管継手、特に金属部と樹脂部の界面の一部にシール材が設けられ液体や気体に対するシール性の優れた異種管継手の製造方法に関する。
【０００２】
【従来の技術】
給水管やガス管などの配管系には、鋼などでできた金属管とポリエチレンやポリブテンなどのポリオレフィン樹脂でできた樹脂管を接続するバブルソケットや給水栓ソケットなどの異種管継手が用いられている。
【０００３】
異種管継手は、青銅などでできた金属部と接続すべき樹脂管と同種の樹脂でできた樹脂部から構成されており、通常、金属部に樹脂部をメカニカルに結合させたり、金属部と樹脂部を射出成形により一体成形して製造される。最近では、実開平７−６５８７号公報や実開平２−６８９８号公報に見られるように、金属部と樹脂部の界面の一部にゴム製Ｏリングなどのシール材を設け、機械的にあるいは射出圧によりシール材を押圧してシール性を高めて管内を流通する気体や液体の漏れ防止が図られているものが多い。
【０００４】
しかし、シール材を設けて金属部と樹脂部を射出成形により一体成形すると、シール材と金属部の隙間に溶融樹脂がまわり込み射出圧によるシール材の押圧が不十分となったり、射出成形時に加熱溶融された樹脂による熱ダメージを受けてシール材が劣化したりして、十分にシール性を高めることができない場合がある。
【０００５】
特開平４−１３１５９０号公報には、シール材を樹脂製短管で覆って射出成形し、シール材と金属部の隙間への溶融樹脂のまわり込みを防止する技術が開示されている。
【０００６】
【発明が解決しようとする課題】
しかしながら、特開平４−１３１５９０号公報に記載された技術では、シール材と金属部の隙間への溶融樹脂のまわり込みやシール材の熱ダメージを防止できるが、樹脂製短管と射出成形された樹脂との界面のシール性が劣化し、気体や液体の漏れる場合がある。
【０００７】
本発明はこのような問題を解決するためになされたもので、確実にシール性を確保できる射出成形による異種管継手の製造方法を提供することを目的とする。
【０００８】
【課題を解決するための手段】
上記課題は以下の手段でにより解決される。
１金属部に樹脂部を射出成形して異種管継手を製造する際に、前記金属部の内面と射出成形時に用いるコアの間にキャビティを設けると共に、前記金属部と前記樹脂部の界面におけるシール性を確保するために、前記金属部の表面に１個以上のシール材を設け、前記シール材を射出成形される樹脂と融着可能な樹脂片で覆った後、前記金属部の温度を５０℃以上にして射出成形する異種管継手の製造方法。
２前記射出成形される樹脂を前記樹脂片に向けて射出する１に記載の異種管継手の製造方法。
３前記樹脂片が前記シール材から離れる方向へ移動することが抑制されている１または２に記載の異種管継手の製造方法。
【０００９】
本発明者らが、特開平４−１３１５９０号公報に記載された技術における樹脂製短管と射出成形された樹脂の界面に生じるシール性劣化の原因を調査したところ、射出成形により金属部と一体成形するため熱伝導性の優れた金属部を通して熱が散逸し易く、溶融樹脂の温度や樹脂製短管の長さなどの条件によっては樹脂製短管と射出成形される樹脂とを融着するのに必要な界面温度が確保されず、融着が不完全に行われることに起因していることが明らかになった。
【００１０】
そこで、金属部を通しての熱の散逸を低減させる方法を検討したところ、金属部の表面に１個以上のシール材を設け、このシール材を射出成形される樹脂と融着可能な樹脂片で覆った後、金属部の温度を５０℃以上、より好ましくは６０℃以上にして射出成形すれば、熱の散逸を抑制でき、確実に融着できることを見出した。金属部の温度の上限は、シール材が劣化したり、樹脂製短管などの樹脂片が溶融する温度より低ければよいが、射出成形後の冷却を考慮すると１００℃以下が好ましい。
【００１１】
射出成形時に溶融樹脂を樹脂片に向けて射出させれば、高温の樹脂が直接樹脂片に供給されるので熱の散逸をより確実に抑制できる。
【００１２】
溶融樹脂が射出されて固化する前に、射出圧により押圧されたシール材にはそれ自体の弾性により復元力が働き、シール材の種類によっては、押圧力が著しく弱まりシール性が劣化する場合がある。そこで、シール材を覆う樹脂片のシール材から離れる方向へ移動を、例えば金属部に樹脂片の移動を阻止する微少な突起を設けたりして抑制すれば、シール材の復元が抑制されて押圧力が著しく弱まることを防止できる。
【００１３】
金属部の内面と射出成形時に用いるコアの間にキャビティを設けて射出成形すれば、金属部の内面が樹脂で被覆されるので、金属部の耐食性を向上できる。
【００１４】
【発明の実施の形態】
図１に、本発明である異種管継手の製造方法の１実施の形態を示す。
【００１５】
図１は、射出成形のダイ６内にシール材３と樹脂片４を順次取り付けた金属部１を設置し、コア７を挿入した後の片断面を示している。
【００１６】
樹脂部と界面を形成する金属部１の表面にシール材３と樹脂片４を順次取り付け、金属部１を５０℃以上に加熱してダイ６に設置後、温度が５０℃未満にならないうちに溶融樹脂をランナ５より樹脂片４に向けながらキャビティ２内に吐出させて樹脂部を射出成形すれば、樹脂片４と射出成形される樹脂の界面温度の大きな低下を防止できるので、樹脂片４と射出成形される樹脂を確実に融着一体化できる。また、樹脂片４によりシール材３と金属部１の隙間への溶融樹脂のまわり込みやシール材３への熱ダメージも防止できる。
【００１７】
本実施の形態では、射出成形により金属部１の内面が樹脂被覆されるようになっているので、金属部１の耐食性を向上できる。
【００１８】
なお、シール材３は図１のように金属部１の開口端面に設ける方が、金属部１の内外壁面に設けるより、射出圧をシール材３が金属部１の面に垂直に押圧されるように有効に付与できるので好ましい。
【００１９】
図２に、本発明である異種管継手の製造方法の別の実施の形態を示す。
図２では、図１の金属部１に、樹脂片４がシール材３から離れる方向へ移動しないように、樹脂片４の端部が挿入される樹脂片ストッパー用溝８が設けられている。
【００２０】
この樹脂片ストッパー用溝８により、溶融樹脂が射出されて固化する前に射出圧により押圧されたシール材３が復元することによるシール性の劣化を防止できる。
【００２１】
シール材としては、押圧によりシール性が確保されれば材質や形状に制約はないが、ゴム製などのＯリングの他、テフロン製シール材なども用いることができる。
【００２２】
樹脂部の金属部とは反対側の部分は、単純な樹脂管としてもよく、電熱線を設けて電気融着継手としてもよい。
【００２３】
【発明の効果】
本発明は以上説明したように構成されているので、確実にシール性を確保できる射出成形による異種管継手の製造方法を提供できる。
【図面の簡単な説明】
【図１】本発明である異種管継手の製造方法の１実施の形態を示す図である。
【図２】本発明である異種管継手の製造方法の別の実施の形態を示す図である。
【符号の説明】
１金属部
２キャビティ（樹脂部）
３シール材
４樹脂片
５ランナ
６ダイ
７コア
８樹脂片ストッパー用溝[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a dissimilar pipe joint composed of a metal part and a resin part, and more particularly to a method for manufacturing a dissimilar pipe joint having a sealing property provided at a part of an interface between the metal part and the resin part and having excellent sealing properties against liquids and gases.
[0002]
[Prior art]
For piping systems such as water supply pipes and gas pipes, different types of pipe joints such as bubble sockets and hydrant sockets are used to connect metal pipes made of steel and resin pipes made of polyolefin resin such as polyethylene and polybutene. I have.
[0003]
Dissimilar pipe joints consist of a metal part made of bronze etc. and a resin part made of the same kind of resin as the resin pipe to be connected.In general, the resin part is mechanically connected to the metal part, It is manufactured by integrally molding the resin part by injection molding. Recently, as shown in Japanese Utility Model Laid-Open No. 7-6587 and Japanese Utility Model Laid-Open No. 2-6898, a sealing material such as a rubber O-ring is provided at a part of an interface between a metal portion and a resin portion, and mechanically or In many cases, the sealing material is pressed by the injection pressure to enhance the sealing property and prevent leakage of gas or liquid flowing in the pipe.
[0004]
However, if the sealing material is provided and the metal part and the resin part are integrally molded by injection molding, the molten resin will flow around the gap between the sealing material and the metal part, and the pressure of the sealing material by the injection pressure will be insufficient, or during injection molding, In some cases, the sealing material may be deteriorated due to thermal damage due to the heat-melted resin, and the sealing property may not be sufficiently improved.
[0005]
Japanese Patent Application Laid-Open No. 4-131590 discloses a technique in which a sealing material is covered with a short tube made of resin and injection-molded to prevent molten resin from entering a gap between the sealing material and a metal part.
[0006]
[Problems to be solved by the invention]
However, according to the technique described in Japanese Patent Application Laid-Open No. 4-131590, it is possible to prevent the molten resin from flowing into the gap between the sealing material and the metal portion and to prevent the sealing material from being thermally damaged. The sealing property at the interface with the resin may be deteriorated, and gas or liquid may leak.
[0007]
The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a method for manufacturing a dissimilar pipe joint by injection molding, which can reliably ensure sealing performance.
[0008]
[Means for Solving the Problems]
The above problem is solved by the following means.
(1) When manufacturing a dissimilar pipe joint by injection molding a resin part in a metal part, a cavity is provided between an inner surface of the metal part and a core used in injection molding, and a seal at an interface between the metal part and the resin part. In order to ensure the performance, at least one sealing material is provided on the surface of the metal part, and the sealing material is covered with a resin piece that can be fused with the resin to be injection molded. A method for manufacturing a dissimilar pipe joint that is injection molded at a temperature of at least ℃.
2. The method for manufacturing a dissimilar pipe joint according to 1, wherein the resin to be injection-molded is injected toward the resin piece.
(3) The method for manufacturing a dissimilar pipe joint according to (1) or (2), wherein the resin piece is prevented from moving in a direction away from the sealing material.
[0009]
The present inventors have investigated the cause of the deterioration of the sealing property at the interface between the resin short tube and the injection-molded resin in the technique described in Japanese Patent Application Laid-Open No. 4-131590. Heat is easily dissipated through the metal part with excellent thermal conductivity for molding, and depending on conditions such as the temperature of the molten resin and the length of the resin short tube, the resin short tube and the resin to be injection molded are fused. It was clarified that the interfacial temperature required for this was not ensured, and that the fusion was incompletely performed.
[0010]
Therefore, when a method for reducing heat dissipation through the metal part was examined, one or more sealing materials were provided on the surface of the metal part, and this sealing material was covered with a resin piece that can be fused with the resin to be injection-molded. After that, if the temperature of the metal part is 50 ° C. or more, more preferably 60 ° C. or more and injection molding is performed, it has been found that heat dissipation can be suppressed and fusion can be surely performed. The upper limit of the temperature of the metal portion may be lower than the temperature at which the sealing material is deteriorated or the resin piece such as a resin short tube is melted, but is preferably 100 ° C. or lower in consideration of cooling after injection molding.
[0011]
If the molten resin is injected toward the resin piece during injection molding, the high-temperature resin is directly supplied to the resin piece, so that the dissipation of heat can be suppressed more reliably.
[0012]
Before the molten resin is injected and solidified, the sealing material pressed by the injection pressure exerts a restoring force due to its own elasticity, and depending on the type of sealing material, the pressing force may be significantly reduced and the sealing property may be deteriorated. is there. Therefore, if the movement of the resin piece covering the seal material in the direction away from the seal material is suppressed, for example, by providing a minute projection on the metal portion to prevent the movement of the resin piece, the restoration of the seal material is suppressed and the pushing is suppressed. It is possible to prevent the pressure from remarkably weakening.
[0013]
If the cavity is provided between the inner surface of the metal part and the core used for injection molding and injection molding is performed, the inner surface of the metal part is covered with the resin, so that the corrosion resistance of the metal part can be improved.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows an embodiment of a method for manufacturing a different type pipe joint according to the present invention.
[0015]
FIG. 1 shows a cross section of a
[0016]
After the sealing
[0017]
In the present embodiment, since the inner surface of the
[0018]
It is to be noted that, when the sealing
[0019]
FIG. 2 shows another embodiment of the method for manufacturing a dissimilar pipe joint according to the present invention.
In FIG. 2, the
[0020]
The resin
[0021]
The sealing material is not limited in material and shape as long as the sealing property is secured by pressing, but a Teflon sealing material or the like can be used in addition to an O-ring made of rubber or the like.
[0022]
A portion of the resin portion opposite to the metal portion may be a simple resin tube, or a heating wire may be provided to form an electric fusion joint.
[0023]
【The invention's effect】
Since the present invention is configured as described above, it is possible to provide a method for manufacturing a dissimilar pipe joint by injection molding, which can reliably ensure sealing performance.
[Brief description of the drawings]
FIG. 1 is a view showing one embodiment of a method for manufacturing a dissimilar pipe joint according to the present invention.
FIG. 2 is a view showing another embodiment of the method for manufacturing a dissimilar pipe joint according to the present invention.
[Explanation of symbols]
1
3
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25159697A JP3584697B2 (en) | 1997-08-20 | 1997-09-17 | Manufacturing method for heterogeneous pipe joints |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9-223256 | 1997-08-20 | ||
| JP22325697 | 1997-08-20 | ||
| JP25159697A JP3584697B2 (en) | 1997-08-20 | 1997-09-17 | Manufacturing method for heterogeneous pipe joints |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11125383A JPH11125383A (en) | 1999-05-11 |
| JP3584697B2 true JP3584697B2 (en) | 2004-11-04 |
Family
ID=26525363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25159697A Expired - Fee Related JP3584697B2 (en) | 1997-08-20 | 1997-09-17 | Manufacturing method for heterogeneous pipe joints |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3584697B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101138441B1 (en) | 2011-04-12 | 2012-04-26 | 와토스코리아 주식회사 | Connecting hose and method thereof |
-
1997
- 1997-09-17 JP JP25159697A patent/JP3584697B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11125383A (en) | 1999-05-11 |
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