JP2021183854A - Resin pipe for pipe connection and manufacturing method thereof - Google Patents
Resin pipe for pipe connection and manufacturing method thereof Download PDFInfo
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- JP2021183854A JP2021183854A JP2020089262A JP2020089262A JP2021183854A JP 2021183854 A JP2021183854 A JP 2021183854A JP 2020089262 A JP2020089262 A JP 2020089262A JP 2020089262 A JP2020089262 A JP 2020089262A JP 2021183854 A JP2021183854 A JP 2021183854A
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- thermoplastic resin
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- 229920005989 resin Polymers 0.000 title claims abstract description 53
- 239000011347 resin Substances 0.000 title claims abstract description 53
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 24
- 238000002844 melting Methods 0.000 claims abstract description 10
- 230000008018 melting Effects 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 40
- 238000000465 moulding Methods 0.000 claims description 9
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 5
- 239000000155 melt Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Flanged Joints, Insulating Joints, And Other Joints (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
Description
本発明は、各種配管に用いられる樹脂管に関し、特に管材に接続部が一体的に形成された配管接続用樹脂管及びその製造方法に係る。 The present invention relates to resin pipes used for various pipes, and more particularly to a pipe connection resin pipe having a connection portion integrally formed with a pipe material and a method for manufacturing the same.
水配管やガス配管等の配管として、樹脂製の管材が使用されることがある。
この場合に、樹脂管同士あるいは継手等と配管接続するのに、フランジ形状の接続部が設けられている。
この場合に、樹脂管材にフランジ形状の接続部を溶着する方法の他に、樹脂管の端部側にフランジ部を一体的に成形する方法がある。
例えば特許文献１には、樹脂配管と接合フランジとを射出成形にて一体的に成形する例が開示されている。
Resin pipes may be used for pipes such as water pipes and gas pipes.
In this case, a flange-shaped connecting portion is provided to connect the resin pipes to each other or to a joint or the like.
In this case, in addition to the method of welding the flange-shaped connection portion to the resin pipe material, there is a method of integrally molding the flange portion on the end side of the resin pipe.
For example, Patent Document 1 discloses an example in which a resin pipe and a joint flange are integrally molded by injection molding.
しかし、樹脂材料は、溶融状態から冷却固化される際に、体積収縮する性質があるために、接合フランジ部の一部にヒケが生じやすい。
特に、フランジ部の肉厚が管材の一般肉厚よりも厚い場合には、そのヒケが大きくなる。
特許文献１は、このヒケ対策としてフランジの接合面に環状突起を形成する例を開示している。
しかし、これでは配管同士を接続する際には、一方の配管側に突起を設けると、他方の配管側にその突起を吸収するシール部材等が必要になり、配管接続の自由度が制限される問題がある。
However, since the resin material has a property of volume shrinkage when it is cooled and solidified from the molten state, sink marks are likely to occur in a part of the joint flange portion.
In particular, when the wall thickness of the flange portion is thicker than the general wall thickness of the pipe material, the sink mark becomes large.
Patent Document 1 discloses an example in which an annular protrusion is formed on a joint surface of a flange as a countermeasure against this sink mark.
However, in this case, when connecting pipes to each other, if a protrusion is provided on one pipe side, a seal member or the like that absorbs the protrusion is required on the other pipe side, which limits the degree of freedom in pipe connection. There's a problem.
本発明は、接続部を一体的に形成した樹脂管であって、接続部のヒケを抑え、成形性にも優れた配管接続用樹脂管及びその製造方法の提供を目的とする。 An object of the present invention is to provide a resin pipe for pipe connection, which is a resin pipe in which a connecting portion is integrally formed, suppresses sink marks in the connecting portion, and has excellent moldability, and a method for manufacturing the same.
本発明に係る配管接続用樹脂管は、熱可塑性樹脂の端部側に当該熱可塑性樹脂の一部を溶融して溶融成形された接続部を有し、前記接続部はサポート部材に前記熱可塑性樹脂の一部が溶融接合されていることを特徴とする。
ここで、熱可塑性樹脂管の端部側と表現したのは、管材の端部又はその端部寄りを意味し、端部に限定されない。
The resin pipe for connecting pipes according to the present invention has a connecting portion formed by melting a part of the thermoplastic resin on the end side of the thermoplastic resin, and the connecting portion is attached to the support member with the thermoplasticity. It is characterized in that a part of the resin is melt-bonded.
Here, the term "end side" of the thermoplastic resin pipe means the end of the pipe material or the end thereof, and is not limited to the end.
本発明における配管接続用樹脂管は、管材の端部付近を金型内に挿入し、この管材の一部を溶融状態に加熱し、加圧成形したものである点で、特許文献１に開示する射出成形とは相違する。 The resin pipe for connecting pipes in the present invention is disclosed in Patent Document 1 in that the vicinity of the end portion of the pipe material is inserted into a mold, a part of the pipe material is heated to a molten state, and pressure-molded. It is different from injection molding.
金型内に管材の端部を挿入して加熱溶融し、接続部を金型成形した後に冷却固化させることになるが、これにより体積収縮しても接続部はサポート部材に溶融した樹脂が溶着するように成形されるので、このサポート部材の体積（肉厚）に相当する分だけ溶融樹脂の量が少なくなるので、固化時のヒケの量が少なくなる。
また、接続部は加熱溶融された溶融樹脂がサポート部材に密着するように流動し、その後に冷却・固化することになるが、その際の歪みや変形をサポート部材が抑える作用も有する。
The end of the pipe material is inserted into the mold and melted by heating, and the connection part is molded and then cooled and solidified. As a result, even if the volume shrinks, the molten resin is welded to the support member at the connection part. Since it is molded so as to be formed, the amount of the molten resin is reduced by the amount corresponding to the volume (thickness) of the support member, so that the amount of sink marks at the time of solidification is reduced.
Further, in the connecting portion, the molten resin heated and melted flows so as to be in close contact with the support member, and then is cooled and solidified, but the support member also has an action of suppressing distortion and deformation at that time.
本発明において、サポート部材を管材と同一又は同系統の樹脂材料とした場合に、管材の一部が溶着してサポート部材と接続した場合の溶融密着性に優れる。
熱可塑性樹脂としては、加熱溶融可能な樹脂であれば管材として使用される樹脂に制限はない。
代表的には、ポリエチレン，ポリプロピレン等のオレフィン系樹脂やナイロン，塩化ビニル樹脂等が一例として挙げられる。
In the present invention, when the support member is made of the same or the same type of resin material as the pipe material, the melt adhesion is excellent when a part of the pipe material is welded and connected to the support member.
As the thermoplastic resin, there is no limitation on the resin used as the pipe material as long as it is a resin that can be melted by heating.
Typical examples include olefin resins such as polyethylene and polypropylene, nylon and vinyl chloride resins.
本発明において、サポート部材を管材の樹脂材料よりも高強度の樹脂材で製作してあったり、金属製で製作すると接合部の強度を向上させることができる。
この場合に、サポート部材が高融点のフッ素樹脂材や金属材である場合には、溶融樹脂との密着面に凹凸等の接合面にしてもよい。
In the present invention, if the support member is made of a resin material having a higher strength than that of the resin material of the pipe material, or if it is made of metal, the strength of the joint portion can be improved.
In this case, when the support member is a fluororesin material or a metal material having a high melting point, the contact surface with the molten resin may be a joint surface such as unevenness.
サポート部材の形状は、接続部の形状に応じて設定され、形状には制限がない。
例えば、外形が円形つば形状の接続部にあっては、このサポート部材はドーナツ形状であってもよい。
サポート部材は、接続部の強度向上の作用もあり、接続部を形成する際に溶融樹脂で包設するようにしてもよく、複数のサポート部材に分割してもよい。
また、サポート部材の替わりに金型側に孔形成部材を配置することで、熱可塑性樹脂管の端部側に当該熱可塑性樹脂の一部を溶融して溶融成形された接続部を有し、前記接続部は溶融成形時に形成されたボルト等による接続孔を有しているようにしてもよい。
The shape of the support member is set according to the shape of the connecting portion, and the shape is not limited.
For example, if the outer shape is a circular brim-shaped connection portion, the support member may be donut-shaped.
The support member also has an effect of improving the strength of the connecting portion, and may be encapsulated with a molten resin when forming the connecting portion, or may be divided into a plurality of support members.
Further, by arranging the hole forming member on the mold side instead of the support member, a connecting portion formed by melting a part of the thermoplastic resin is provided on the end side of the thermoplastic resin tube. The connection portion may have a connection hole made of bolts or the like formed during melt molding.
本発明に係る配管接続用樹脂管の製造方法は、金型は熱可塑性樹脂管を端部側から挿入する挿入部と、挿入された熱可塑性樹脂管の一部を溶融して接続部を形成するためのフランジ成形部を有し、前記フランジ成形部にサポート部材又は接続孔成形部材を配設した状態で前記熱可塑性樹脂管を端部側から前記金型に挿入加圧することで前記接続部を溶融成形することを特徴とする。 In the method for manufacturing a resin pipe for connecting a pipe according to the present invention, the mold forms a connecting portion by melting an insertion portion into which the thermoplastic resin pipe is inserted from the end side and a part of the inserted thermoplastic resin pipe. The connecting portion is formed by inserting the thermoplastic resin pipe into the mold from the end side and applying pressure in a state where the flange forming portion is provided and the support member or the connection hole forming member is arranged in the flange forming portion. Is characterized by melt molding.
本発明においては、管材の端部側に管材の一部を加熱溶融して、フランジ形状等の接続部を成形する際に、接続部となる部分にサポート部材を配置したので、接続部における溶融樹脂量、例えば肉厚が小さくなる。
これにより、固化時のヒケ量を少なくすることができる。
また、溶融樹脂量が少なくなる分だけ、固化するまでの冷却時間が短くなり、生産性が向上する。
また、サポート部材の形状，配置，材質等を適宜選定することで、接続部の強度が向上し、薄肉化，小型化も可能になる。
In the present invention, when a part of the pipe material is heated and melted on the end side of the pipe material to form a connection portion such as a flange shape, a support member is arranged at the portion to be the connection portion. The amount of resin, for example, the wall thickness becomes small.
This makes it possible to reduce the amount of sink marks during solidification.
Further, as the amount of the molten resin is reduced, the cooling time until solidification is shortened, and the productivity is improved.
In addition, by appropriately selecting the shape, arrangement, material, etc. of the support member, the strength of the connecting portion can be improved, and the thickness and size can be reduced.
本発明に係る配管接続用樹脂管（製品）の構造例及び製造例を以下図に基づいて説明するが、本発明はこれに限定されない。 A structural example and a manufacturing example of the resin pipe (product) for connecting pipes according to the present invention will be described with reference to the following figures, but the present invention is not limited thereto.
図１の流れに基づいて製造例を説明する。
図１は断面図で説明したが、樹脂管材１１は断面円形状の熱可塑性樹脂からなる管材である。
金型は半割構造で、図１（ｄ）に示すように左右に開閉可能になっていて、中央部には樹脂管材１の内側に挿入され、内周部を拘束する円柱状のコア型１１を有する。
コア型１１は、ベース部１１ａから円柱部１１ｂを立設した例になっている。
金型は、接続部を形成するためのキャビティ部を有し、成形後に製品を取り出すことができれば、その構造に制限がない。
A manufacturing example will be described based on the flow of FIG.
Although FIG. 1 has been described with a cross-sectional view, the
The mold has a half-split structure and can be opened and closed to the left and right as shown in FIG. 1 (d). Has 11.
The
The mold has a cavity portion for forming a connection portion, and the structure is not limited as long as the product can be taken out after molding.
図１では、左右に配置した半割形状の外形型１２，１３にて樹脂管材１の外周部に、つば形状の接続部３ａを形成するようになっている。
外形型は、成形後に製品を取り出すことができれば、半割構造に制限されない。
管材の溶融加圧時には、外形型が相対的に開く方向に力が加わるので、例えば一対の半割外形型の外周部をリング部材で保持してもよく、シリンダー等にて両側から型締めしてもよい。
外形型１２，１３の内周面にリング溝状のフランジ成形部１４を有する。
この溝状のフランジ成形部１４の内側に、ドーナツ状のサポート部材２を配置した例になっている。
図１（ａ）では、サポート部材２をフランジ成形部の内側上部に配置した例になっているが、下部側や中央部でもよい。
In FIG. 1, half-split
The outer shape is not limited to the half-split structure as long as the product can be taken out after molding.
At the time of melt pressurization of the pipe material, a force is applied in the direction in which the outer die is relatively opened. You may.
A ring groove-shaped
This is an example in which the donut-
FIG. 1A shows an example in which the
図１（ａ）に示すように、中央のコア型１１と外形型１２，１３の間に形成した隙間（挿入部）１５に、樹脂管材１をその端部から挿入する。
図１（ｂ）は、挿入が完了した状態を示す。
この状態で樹脂管材１の溶融温度、例えば１９０℃になるように金型を加熱する。
さらに、図１（ｃ）に示すように樹脂管材１を上側から加圧ｆにて加圧すると、管材の一部がフランジ成形部１４に向けて変形し、サポート部材２に密着しながらフランジ成形部１４の空間部（キャビティ）に流れ込み、つば形状の接続部３ａが形成される。
金型が冷却され、外形型１２，１３が開き、取り出した製品の外形形状を図２に示す。
接続部３ａは、サポート部材２に重ね合うように溶融接合部３ｂが形成されている。
As shown in FIG. 1A, the resin pipe material 1 is inserted from the end portion into the gap (insertion portion) 15 formed between the
FIG. 1B shows a state in which the insertion is completed.
In this state, the mold is heated so that the melting temperature of the resin tube material 1 becomes, for example, 190 ° C.
Further, as shown in FIG. 1 (c), when the resin pipe material 1 is pressurized from above with the pressure f, a part of the pipe material is deformed toward the
The mold is cooled, the
The
サポート部材２は樹脂管材１と同系統の熱可塑性樹脂でもよいが、フッ素樹脂等の高融点材料や金属材である場合には、接合面の密着性を向上させる目的で図３に示すように、サポート部材２の接合面２ａに凹凸形状を設けることで、その部分に溶融樹脂３ｃが流れ込み、密着強度が向上する。
The
図４に示した例は、金型のフランジ成形部１４にピン部材１３ａを配置することで、接続部３ａにボルト等の締結部材を挿入する接続孔３ｄをつば部の成形と同時に成形することもできる。
In the example shown in FIG. 4, by arranging the
本実施例は、管材の端部寄りの外周部に、つば形状の接続部３ａを形成した例となっているが、管材の端部に段差状のフランジ部を形成したりすることができる。
また、接続部の形状も円形状に限らず、楕円形状，六角形状等、目的に応じて設計できる。
図５には、接続部３ａ（２，３ｂ）を樹脂管材１の端部に設ける例を示す。
In this embodiment, the flange-shaped connecting
Further, the shape of the connecting portion is not limited to the circular shape, but can be designed according to the purpose such as an elliptical shape or a hexagonal shape.
FIG. 5 shows an example in which the connecting
１ 樹脂管材
２ サポート部材
３ 配管接続用樹脂管
３ａ 接続部
３ｂ 溶融接合部
１１ コア型
１２ 外形型
１３ 外形型
１４ フランジ成形部
1
Claims (5)
前記接続部はサポート部材に前記熱可塑性樹脂の一部が溶融接合されていることを特徴とする配管接続用樹脂管。 It has a connection part formed by melting a part of the thermoplastic resin on the end side of the thermoplastic resin tube.
The connection portion is a resin pipe for connecting pipes, characterized in that a part of the thermoplastic resin is melt-bonded to the support member.
前記接続部は溶融成形時に形成されたボルト等による接続孔を有していることを特徴とする配管接続用樹脂管。 It has a connection part formed by melting a part of the thermoplastic resin on the end side of the thermoplastic resin tube.
A resin pipe for connecting pipes, wherein the connecting portion has a connecting hole formed by a bolt or the like formed during melt molding.
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| JP2020089262A JP7488693B2 (en) | 2020-05-22 | 2020-05-22 | Resin pipe for piping connection and its manufacturing method |
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| JP2020089262A JP7488693B2 (en) | 2020-05-22 | 2020-05-22 | Resin pipe for piping connection and its manufacturing method |
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| JP3548436B2 (en) | 1998-09-09 | 2004-07-28 | 株式会社日立ユニシアオートモティブ | Molding equipment for cylindrical molded products with flange |
| JP2006037981A (en) | 2004-07-22 | 2006-02-09 | Furukawa Electric Co Ltd:The | Connection part of plastic pipe |
| EP3489561A4 (en) | 2016-07-20 | 2020-01-01 | Sang Seon Lee | Plastic valve capable of preventing distortion |
| JP6158458B1 (en) | 2017-04-21 | 2017-07-05 | 淀川ヒューテック株式会社 | Tube with hook |
| JP7068038B2 (en) | 2018-05-23 | 2022-05-16 | 株式会社リケンCkjv | Resin pipe for pipe connection and connection structure using it |
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