JP7180998B2 - Method for manufacturing resin piping - Google Patents

Method for manufacturing resin piping Download PDF

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Publication number
JP7180998B2
JP7180998B2 JP2018092333A JP2018092333A JP7180998B2 JP 7180998 B2 JP7180998 B2 JP 7180998B2 JP 2018092333 A JP2018092333 A JP 2018092333A JP 2018092333 A JP2018092333 A JP 2018092333A JP 7180998 B2 JP7180998 B2 JP 7180998B2
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tube member
diameter
resin tube
resin
end portion
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JP2019196831A (en
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晴也 溜渕
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Miraial Co Ltd
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Miraial Co Ltd
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Priority to JP2018092333A priority Critical patent/JP7180998B2/en
Priority to TW108110242A priority patent/TWI821261B/en
Priority to CN201910385563.XA priority patent/CN110466142B/en
Publication of JP2019196831A publication Critical patent/JP2019196831A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • B29C57/02—Belling or enlarging, e.g. combined with forming a groove
    • B29C57/04—Belling or enlarging, e.g. combined with forming a groove using mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe joints

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Description

この発明は、樹脂製チューブ部材と樹脂製管継手もしくは他の樹脂製チューブ部材とをそれらの端部の溶着により連結する樹脂製配管の製造方法に関するものであり、特に、樹脂製配管の品質向上に寄与することのできる技術を提案するものである。 TECHNICAL FIELD The present invention relates to a method for manufacturing a resin pipe, in which a resin tube member and a resin pipe joint or another resin tube member are connected by welding their ends. We propose a technology that can contribute to quality improvement.

様々な産業で用いられる薬液輸送ライン等の樹脂製配管は、溶着機を用いて、熱可塑性樹脂等からなる樹脂製管継手や樹脂製チューブ部材のそれぞれの端部を互いに突き合わせて溶着させることにより製造されることがある。 Resin pipes such as chemical transport lines used in various industries are made by welding the ends of resin pipe joints and resin tube members made of thermoplastic resin etc. against each other using a welding machine. may be manufactured.

このような樹脂製配管の製造方法の一例を詳説すれば、たとえば、溶着機の対をなすクランプ治具のそれぞれに、二個の樹脂製チューブ部材や樹脂製管継手のそれぞれを、それらの端部が互いに対向する姿勢で保持させる。次いで、各クランプ治具に保持させた二個の樹脂製チューブ部材等のそれぞれの端部を、ヒーター等によって加熱することで、それらの端部を溶融させ、その状態で、二個の樹脂製チューブ部材等を互いに接近させて、当該端部を所要の圧力の作用により突き合わせて溶着させる。このような樹脂製チューブ部材等の端部どうしの溶着を繰り返し行うことで、所定の形状の配管を製造することができる。 An example of such a method for manufacturing a resin pipe will be described in detail. are held so that the parts face each other. Next, by heating the ends of the two resin tube members held by each clamp jig with a heater or the like, the ends are melted, and in that state, the two resin The tube members or the like are brought together and the ends are butted and welded under the action of the required pressure. By repeating such welding of the ends of the resin tube member or the like, it is possible to manufacture a pipe having a predetermined shape.

この種の樹脂製配管では、樹脂製チューブ部材や樹脂製管継手のそれぞれの溶着した端部間の内面の位置ずれや段差の発生を極力防止することが望ましい。これはすなわち、かかる位置ずれや段差は、端部の溶着強度を低下させる要因となり、長期間の使用による劣化や外力の作用によって、溶着した端部に破断やクラックを生じさせ得るからである。 In this type of resin piping, it is desirable to prevent as much as possible the occurrence of positional deviation and steps on the inner surface between the welded ends of the resin tube member and the resin pipe joint. This is because such positional deviations and steps reduce the welding strength of the ends, and deterioration due to long-term use and the action of external forces can cause fractures and cracks in the welded ends.

なお、特許文献１には、樹脂製管継手を端部で溶着させるに当り、樹脂製管継手の相互の溶着された端部の位置ずれを防止すること等を目的として、樹脂製管継手の外面に、溶着機のクランプ治具に保持させる固定部を設けることが提案されている。 In addition, Patent Document 1 discloses a technique for welding resin pipe joints at their ends, for the purpose of preventing positional deviation of welded ends of resin pipe joints. It has been proposed to provide the outer surface with a fixing portion to be held by a clamp jig of a welding machine.

特許第５７１０４５０号公報Japanese Patent No. 5710450

ところで、樹脂材料をチューブ状に成形して得られる樹脂製チューブ部材では、溶着機等で、端部どうしを溶着させるべく当該端部を加熱して溶融させると、その端部が先細りに縮径する変形が生じることが解かった。そして、この状態のまま、当該樹脂製チューブ部材を、樹脂製管継手もしくは他の樹脂製チューブ部材と端部で溶着させて連結した場合は、溶着した端部間の内面に大きな位置ずれや段差が発生するという問題があった。 By the way, in a resin tube member obtained by molding a resin material into a tubular shape, when the ends are heated and melted by a welding machine or the like so that the ends are welded together, the ends are tapered and reduced in diameter. It was found that deformation occurs. In this state, if the resin tube member is welded to a resin pipe joint or another resin tube member at the ends and connected, a large positional deviation or step may occur on the inner surface between the welded ends. occurred.

この発明は、従来技術が抱えるこのような問題を解決することを課題とするものであり、その目的とするところは、樹脂製チューブ部材と樹脂製管継手もしくは他の樹脂製チューブ部材の溶着された端部間での大きな位置ずれや段差の発生を有効に防止することのできる樹脂製配管の製造方法を提供することにある。 An object of the present invention is to solve such problems of the prior art, and an object of the present invention is to weld a resin tube member and a resin pipe joint or other resin tube member. To provide a method for manufacturing a resin pipe which can effectively prevent occurrence of a large positional deviation and a step between ends.

この発明の樹脂製配管の製造方法は、樹脂製チューブ部材と樹脂製管継手もしくは他の樹脂製チューブ部材とを連結して、樹脂製配管を製造する方法であって、樹脂材料から成形した樹脂製チューブ部材の端部の内外径を、該樹脂製チューブ部材の残部の内外径よりも拡大させて、前記端部を拡径端部とする端部拡径工程と、前記樹脂製チューブ部材の拡径端部、および、該樹脂製チューブ部材に連結する樹脂製管継手もしくは他の樹脂製チューブ部材の端部をともに加熱して溶融させ、当該拡径端部と端部とを突き合わせて溶着する端部溶着工程とを含み、前記端部拡径工程後に前記樹脂製チューブ部材の前記拡径端部が縮径し、前記端部溶着工程を、当該拡径端部の内外径が拡大前の大きさに戻る前に行うというものである。 A method for manufacturing a resin pipe according to the present invention is a method for manufacturing a resin pipe by connecting a resin tube member and a resin pipe joint or another resin tube member, wherein the resin is molded from a resin material. enlarging the inner and outer diameters of the ends of the resin tube member so as to make the ends larger than the inner and outer diameters of the remaining part of the resin tube member, and The diameter-enlarged end and the end of the resin pipe joint or other resin-made tube member connected to the resin-made tube member are heated and melted together, and the diameter-enlarged end and the end are butted and welded. wherein the diameter of the enlarged diameter end of the resin tube member is reduced after the diameter expansion step, and the inner and outer diameters of the enlarged diameter end are expanded during the edge welding step. This is done before returning to the previous size.

ここで好ましくは、端部拡径工程で、樹脂製チューブ部材の前記端部の内側に、拡径治具を挿入することにより、当該端部の内外径を拡大させる。
この場合、前記拡径治具が、樹脂製チューブ部材の端部へ挿入される挿入部を含み、前記挿入部が、先端側から後方側に向かうに従って外径を漸増させたテーパ状の外周面を有することが好ましい。 Here, preferably, in the end portion diameter enlarging step, the inner and outer diameters of the end portion are enlarged by inserting a diameter enlarging jig inside the end portion of the resin tube member.
In this case, the diameter-expanding jig includes an insertion portion that is inserted into the end portion of the resin tube member, and the insertion portion has a tapered outer peripheral surface whose outer diameter gradually increases from the tip side to the rear side. It is preferred to have

また好ましくは、端部拡径工程で、樹脂製チューブ部材の前記拡径端部を、当該拡径端部の少なくとも一部で該拡径端部の端面側に向かうに従って内外径が漸増するテーパ形状とすることが好ましい。 Preferably, in the step of increasing the diameter of the end portion, the enlarged end portion of the resin tube member is tapered such that the inner and outer diameters gradually increase toward the end face side of the enlarged end portion at least part of the enlarged end portion. A shape is preferred.

上述したいずれかの樹脂製配管の製造方法では、樹脂製チューブ部材と他の樹脂製チューブ部材とを連結する場合、端部拡径工程で、前記樹脂製チューブ部材及び他の樹脂製チューブ部材のそれぞれの端部の内外径を拡大させて、それぞれの前記端部を拡径端部とし、端部溶着工程で、前記樹脂製チューブ部材及び他の樹脂製チューブ部材のそれぞれの拡径端部どうしを溶着させることが好ましい。 In any of the above-described methods for manufacturing a resin pipe, when connecting a resin tube member and another resin tube member, in the end diameter expanding step, the resin tube member and the other resin tube member are connected. The inner and outer diameters of the respective ends are enlarged to make the respective ends the enlarged diameter ends, and in the end welding step, the enlarged diameter ends of the resin tube member and the other resin tube member are joined together. is preferably welded.

また、上述したいずれかの樹脂製配管の製造方法では、樹脂製チューブ部材と樹脂製管継手とを連結する場合、端部拡径工程で、前記樹脂製チューブ部材及び樹脂製管継手のうち、樹脂製チューブ部材のみの端部の内外径を拡大させることが好ましい。 Further, in any of the methods for manufacturing a resin pipe described above, when connecting the resin tube member and the resin pipe joint, in the step of expanding the diameter of the end portion, of the resin tube member and the resin pipe joint, It is preferable to enlarge the inner and outer diameters of the ends of only the resin tube member.

この発明によれば、端部溶着工程に先立つ端部拡径工程で、樹脂製チューブ部材の端部の内外径を拡大させて前記端部を拡径端部とすることにより、端部溶着工程で加熱によって樹脂製チューブ部材の拡径端部が縮径変形すると、拡径前の内径に近い内径に戻るので、溶着された端部間での大きな位置ずれや段差の発生を有効に防止することができる。 According to this invention, in the end portion diameter expanding step prior to the end portion welding step, the inner and outer diameters of the end portions of the resin tube member are expanded to form the end portions as diameter-enlarged end portions, thereby performing the end portion welding step. When the enlarged diameter end of the resin tube member is deformed to shrink by heating, it returns to the inner diameter close to the inner diameter before the diameter expansion, so it effectively prevents the occurrence of a large positional deviation or a step between the welded ends. be able to.

この発明の一の実施形態に係る樹脂製配管の製造方法を示すフロー図である。It is a flow figure showing a manufacturing method of resin piping concerning one embodiment of this invention. 図１の実施形態の端部拡径工程の一例を示す、中心軸線に沿う縦断面図である。FIG. 2 is a longitudinal cross-sectional view along the central axis showing an example of an end diameter expanding step of the embodiment of FIG. 1; 図２の端部拡径工程で得られる樹脂製チューブ部材の拡径端部を示す縦断面図である。FIG. 3 is a vertical cross-sectional view showing a diameter-expanded end portion of the resin tube member obtained in the end portion diameter-expanding step of FIG. 2 ; 図１の実施形態の端部溶着工程の加熱時の様子を示す縦断面図である。1. It is a longitudinal cross-sectional view which shows the state at the time of the heating of the edge welding process of embodiment of FIG.

以下に、この発明の実施の形態について詳細に説明する。
この発明の一の実施形態に係る樹脂製配管の製造方法は、樹脂製チューブ部材と樹脂製管継手もしくは他の樹脂製チューブ部材とを連結して、樹脂製配管を製造する方法であり、具体的には、樹脂材料から成形した樹脂製チューブ部材の端部の内外径を、該樹脂製チューブ部材の残部の内外径よりも拡大させて、その端部を拡径端部とする端部拡径工程と、樹脂製チューブ部材の拡径端部、および、樹脂製管継手もしくは他の樹脂製チューブ部材の端部をともに加熱して溶融させ、当該拡径端部と端部とを突き合わせて溶着する端部溶着工程とを含む。なお、樹脂製配管は、その主要部分を構成する樹脂製チューブ部材や樹脂製管継手が樹脂材料からなる配管であることを意味し、樹脂以外の金属等の材料からなる部材が含まれていてもよい。 BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below.
A method for manufacturing a resin pipe according to one embodiment of the present invention is a method for manufacturing a resin pipe by connecting a resin tube member and a resin pipe fitting or another resin tube member, and specifically: Specifically, the inner and outer diameters of the ends of a resin tube member molded from a resin material are made larger than the inner and outer diameters of the remaining part of the resin tube member, and the ends are used as enlarged diameter ends. The diametrical step, the enlarged diameter end portion of the resin tube member, and the end portion of the resin pipe joint or other resin tube member are heated and melted together, and the enlarged diameter end portion and the end portion are brought into contact with each other. and a welding edge welding step. In addition, resin piping means that the resin tube members and resin pipe joints that constitute the main part are piping made of resin materials, and members made of materials such as metals other than resin are included. good too.

端部拡径工程で用いる樹脂製チューブ部材は、樹脂材料に対して押出成形等の所定の成形を行って得られる長尺管状素材を、切断工程で所定の長さに切断して形成されることがあるので、この実施形態は、図１に例示するように、端部拡径工程の前に、当該切断工程をさらに含むものである。ここでは、図１のフロー図に従って各工程について以下に詳説する。但し、樹脂製チューブ部材の形成方法は特に問わず、また、購買その他の何らかの方法で樹脂製チューブ部材を準備してもよいことから、切断工程は省略することもできる。 The resin tube member used in the end diameter expanding step is formed by cutting a long tubular material obtained by subjecting a resin material to predetermined molding such as extrusion molding into a predetermined length in the cutting step. As such, this embodiment further includes the cutting step prior to the end widening step, as illustrated in FIG. Here, each step will be described in detail below according to the flow chart of FIG. However, the method of forming the resin tube member is not particularly limited, and since the resin tube member may be prepared by purchasing or some other method, the cutting step may be omitted.

（切断工程）
切断工程では、一般に押出成形により成形される長尺管状素材を、製造しようとする樹脂製配管で用いる箇所に応じた所定の長さに切断することで、一本以上の樹脂製チューブ部材を形成する。樹脂製チューブ素材は通常、直線もしくは曲線状の直管もしくは曲管形状をなす。
この切断工程は、たとえば、長尺管状素材を大まかにカットする一段目の切断と、その後、高い精度で所定の長さにカットしつつ端面を仕上げる二段目の切断との二つの過程に分けて行うことができる。 (Cutting process)
In the cutting step, one or more resin tube members are formed by cutting a long tubular material, which is generally molded by extrusion, into a predetermined length according to the location to be used in the resin pipe to be manufactured. do. The resin tube material usually has a straight or curved straight or curved shape.
This cutting process is, for example, divided into two processes: a first stage cutting in which a long tubular material is roughly cut, and then a second stage cutting in which the end face is finished while cutting to a predetermined length with high precision. can be done.

長尺管状素材を構成する樹脂材料としては、たとえば、パーフルオロアルコキシアルカン（ＰＦＡ）、パーフルオロエチレンプロペンコポリマー（ＦＥＰ）又はポリエーテルエーテルケトン（ＰＥＥＫ）等を挙げることができるが、ここで挙げた材料以外のものを用いることも可能である。後述する端部溶着工程で樹脂製チューブ部材に端部で溶着される樹脂製管継手や他の樹脂製チューブ部材も、これと同様の樹脂材料からなるものとすることができる。なお樹脂製管継手は、たとえば所定の金型を用いた射出成形により成形することが一般的であり、内部流路が略Ｌ字状に折れ曲がるエルボや、内部流路が途中で分岐してＴ字状等をなすチーズ、内部流路の断面積が途中で変化するレデューサ等の様々なものがある。 Examples of the resin material constituting the long tubular material include perfluoroalkoxyalkane (PFA), perfluoroethylenepropene copolymer (FEP), polyetheretherketone (PEEK), and the like. It is also possible to use things other than materials. Resin pipe joints and other resin tube members whose ends are welded to resin tube members in the end welding step described later can also be made of the same resin material. It should be noted that resin pipe joints are generally formed by injection molding using a predetermined mold, for example. There are various types of cheese, such as a letter-shaped cheese, a reducer in which the cross-sectional area of the internal flow path changes in the middle, and the like.

（端部拡径工程）
端部拡径工程では、上記の樹脂製チューブ部材の端部の内径及び外径（すなわち内外径）を、その樹脂製チューブ部材の残部の内外径よりも拡大させ、それにより、当該端部を、内外径が残部のものよりも拡大した拡径端部とする。 (End diameter expansion process)
In the end diameter enlarging step, the inner and outer diameters (i.e., inner and outer diameters) of the end portions of the resin tube member are made larger than the inner and outer diameters of the remaining portion of the resin tube member, thereby increasing the end portions. , and an enlarged diameter end portion whose inner and outer diameters are larger than those of the remaining portion.

仮に端部拡径工程を経ずに後述の端部溶着工程を行った場合は、端部溶着工程で樹脂製チューブ部材の端部を加熱した際に、押出成形等により生じていた残留応力が加熱によって解放されて、加熱した端部が、その端面に向けて先細りに縮径して変形する。その状態で、当該端部を、樹脂製管継手もしくは他の樹脂製チューブ部材の端部と溶着させると、その内面に大きな段差や位置ずれが生じ、このことが、そこでの強度低下や、破断もしくはクラックの発生の原因となる。
これに対し、この実施形態では、端部溶着工程での加熱に際する樹脂製チューブ部材の端部の縮径変形を見越して、端部溶着工程に先立って端部拡径工程を行うことにより、端部拡径工程で、加熱時の端部の変形量を考慮してその端部を拡径させることができるので、端部溶着工程で当該端部を溶着した際の大きな内面段差及び位置ずれの発生を有効に防止することができる。 If the end welding process, which will be described later, is performed without going through the end diameter expanding process, when the end of the resin tube member is heated in the end welding process, the residual stress generated by extrusion molding, etc. Released by heating, the heated end deforms by tapering toward its end face. In that state, if the end is welded to the end of a resin pipe joint or other resin tube member, a large step or positional deviation occurs on the inner surface, which causes a decrease in strength or breakage. Or it becomes a cause of crack generation.
On the other hand, in this embodiment, in anticipation of diameter reduction deformation of the end of the resin tube member during heating in the end welding process, the end diameter expanding process is performed prior to the end welding process. , In the end diameter expanding process, the end can be expanded in diameter considering the amount of deformation of the end during heating, so there is no large inner surface step and position when the end is welded in the end welding process It is possible to effectively prevent the occurrence of deviation.

樹脂製チューブ部材の端部の拡径は、たとえば、図２に示す手法により実現することができる。
図２に示すところでは、樹脂製チューブ部材１の端部２に挿入することのできる拡径治具１１を用いる。図示の拡径治具１１は具体的には、全体として概して円柱形状をなすものであり、円柱状の基部１２と、基部１２の先端側（図２では右側）に設けられて、樹脂製チューブ部材１の端部２に挿入される挿入部１３とを含むものである。そして、この挿入部１３は、基部１２より膨出した形状であって、先端側から後方側（図２では左側、すなわち基部１２側）に向かうに従って外径が漸増するテーパ状の外周面１３ａを有する。図示の例では、挿入部１３の外周面１３ａは、縦断面にてやや外側に凸の曲線で湾曲する形状としているも、図示しないが直線で外径が漸増する形状とすることも可能である。拡径治具１１の挿入部１３の外径は、その先端側では、樹脂製チューブ部材１の端部２の内径よりも小さく、その後方側では端部２の内径よりも大きくなるものとすることができる。 The diameter expansion of the end portion of the resin tube member can be realized, for example, by the method shown in FIG.
As shown in FIG. 2, a diameter expanding jig 11 that can be inserted into the end portion 2 of the resin tube member 1 is used. Specifically, the illustrated diameter expansion jig 11 has a generally cylindrical shape as a whole, and is provided on a cylindrical base 12 and a distal end side (right side in FIG. 2) of the base 12, and a resin tube and an insertion portion 13 that is inserted into the end portion 2 of the member 1 . The insertion portion 13 has a shape that bulges out from the base portion 12, and has a tapered outer peripheral surface 13a whose outer diameter gradually increases from the distal end side to the rear side (the left side in FIG. 2, i.e., the base portion 12 side). have. In the illustrated example, the outer peripheral surface 13a of the insertion portion 13 has a shape that curves slightly outwardly in the vertical cross section, but it is also possible to have a shape that gradually increases in the outer diameter in a straight line (not shown). . The outer diameter of the inserting portion 13 of the diameter expanding jig 11 is smaller than the inner diameter of the end portion 2 of the resin tube member 1 on the tip side thereof, and larger than the inner diameter of the end portion 2 on the rear side thereof. be able to.

このような拡径治具１１を用いる場合、はじめに、図２（ａ）に矢印で示すように、拡径治具１１と樹脂製チューブ部材１のそれぞれの中心軸線がほぼ一致する向きで、拡径治具１１の挿入部１３に、樹脂製チューブ部材１の端部２を挿入する。
そうすると、樹脂製チューブ部材１の端部２が挿入部１３に挿入されるに伴って、図２（ｂ）に示すように、樹脂製チューブ部材１の端部２は、その端部２の内径よりも外径が大きくなる挿入部１３の外周面１３ａで押し広げられて拡径する。この場合、樹脂製チューブ部材１の端部２の内径及び外径が拡大されることになる。一方、樹脂製チューブ部材１の、内側で挿入部１３が到達しない残部３は、元の内外径が維持される。 When using such a diameter expansion jig 11, first, as indicated by the arrow in FIG. The end portion 2 of the resin tube member 1 is inserted into the insertion portion 13 of the diameter jig 11 .
Then, as the end portion 2 of the resin tube member 1 is inserted into the insertion portion 13, as shown in FIG. The outer peripheral surface 13a of the insertion portion 13, which has a larger outer diameter than the insertion portion 13, pushes and expands the diameter. In this case, the inner diameter and the outer diameter of the end portion 2 of the resin tube member 1 are enlarged. On the other hand, the remaining portion 3 of the resin tube member 1 which is not reached by the insertion portion 13 maintains its original inner and outer diameters.

これにより、樹脂製チューブ部材１の端部２は、図３に示すように、残部３よりも内外径が拡大された拡径端部２ａとなる。 As a result, the end portion 2 of the resin tube member 1 becomes a diameter-enlarged end portion 2a whose inner and outer diameters are larger than those of the remaining portion 3, as shown in FIG.

拡径治具１１により樹脂製チューブ部材１の端部２を拡径させた場合は、拡径治具１１の挿入部１３を樹脂製チューブ部材１の端部２から引き抜いて、樹脂製チューブ部材１から拡径治具１１を取り外すと、時間の経過に伴い、樹脂製チューブ部材１の拡径端部２ａが次第に縮径して元の形状に戻ることがある。 When the diameter of the end portion 2 of the resin tube member 1 is expanded by the diameter expansion jig 11, the insertion portion 13 of the diameter expansion jig 11 is pulled out from the end portion 2 of the resin tube member 1, and the resin tube member is inserted. When the diameter-expansion jig 11 is removed from the resin tube member 1, the diameter-expanded end portion 2a of the resin tube member 1 may gradually shrink and return to its original shape over time.

それ故に、樹脂製チューブ部材１から拡径治具１１を取り外した後は、できる限り速やかに、当該樹脂製チューブ部材１を後述の端部溶着工程に供することが望ましい。 Therefore, after detaching the diameter-expanding jig 11 from the resin tube member 1, it is desirable to subject the resin tube member 1 to the end welding step described later as soon as possible.

また、拡径治具１１の挿入部１３を樹脂製チューブ部材１の端部２に挿入している時間をある程度長くすることで、樹脂製チューブ部材１から拡径治具１１を取り外した後に、樹脂製チューブ部材１の拡径端部２ａの拡径された形状を比較的長時間にわたって維持することができる。拡径治具１１の挿入時間が短い場合は、樹脂製チューブ部材１の拡径端部２ａの形状が端部溶着工程まで維持されない可能性があり、この一方で、挿入時間が長い場合は、生産性の低下を招くおそれがある。 Moreover, by extending the time during which the insertion portion 13 of the diameter expansion jig 11 is inserted into the end portion 2 of the resin tube member 1 to some extent, after removing the diameter expansion jig 11 from the resin tube member 1, The diameter-enlarged shape of the diameter-enlarged end portion 2a of the resin tube member 1 can be maintained for a relatively long period of time. If the insertion time of the diameter expansion jig 11 is short, the shape of the expanded diameter end portion 2a of the resin tube member 1 may not be maintained until the end welding step. There is a possibility of causing a decrease in productivity.

拡径治具１１を用いて得られる樹脂製チューブ部材１の拡径端部２ａは通常、拡径治具１１の挿入部１３の外周面形状に倣った形状となる。図３に示す樹脂製チューブ部材１の拡径端部２ａは、その少なくとも一部、この場合は大部分が、拡径端部２ａの端面４側に向かうに従って内径及び外径が漸増するテーパ形状となっている。
あるいは、図示は省略するが、拡径治具の挿入部の形状を適宜選択することにより、拡径端部を、残部との境界位置で内外径が急激に拡大し、そこから端面に向けて一定の内外径としなる縦断面視でほぼ四角形状のものとしたり、または多角形状のものとしたりする等といった様々な形状とすることができる。 The diameter-enlarged end portion 2 a of the resin tube member 1 obtained by using the diameter-expansion jig 11 usually has a shape following the shape of the outer peripheral surface of the insertion portion 13 of the diameter-expansion jig 11 . At least a portion of the enlarged diameter end portion 2a of the resin tube member 1 shown in FIG. 3, in this case, most of it, has a tapered shape in which the inner diameter and the outer diameter gradually increase toward the end face 4 side of the enlarged diameter end portion 2a. It has become.
Alternatively, although not shown, by appropriately selecting the shape of the insertion portion of the diameter expansion jig, the inner and outer diameters of the expanded end portion are rapidly expanded at the boundary position with the remaining portion, and from there toward the end face It can have various shapes, such as a substantially square shape in longitudinal cross-section with constant inner and outer diameters, or a polygonal shape.

拡径端部２ａの端面４での内径Ｄａの、残部３の内径Ｄに対する比（Ｄａ／Ｄ）は適宜決めることができるが、残部３の内径Ｄに対する拡径端部２ａの端面４での内径Ｄａの比（Ｄａ／Ｄ）が小さすぎると、拡径端部２ａの拡径が、端部溶着工程での加熱時の縮径変形を効果的に抑えることができるほど十分ではないことによって、溶着後に内面段差や位置ずれが生じ得る可能性を否定できない。一方、残部３の内径Ｄに対する拡径端部２ａの端面４での内径Ｄａの比（Ｄａ／Ｄ）が大きすぎると、拡径治具１１を挿入した際の過度な負荷により、ひび（クラック）等が生じる懸念がある。 The ratio (Da/D) of the inner diameter Da at the end surface 4 of the enlarged diameter end portion 2a to the inner diameter D of the remaining portion 3 (Da/D) can be determined as appropriate. If the ratio of the inner diameters Da (Da/D) is too small, the diameter expansion of the diameter-enlarged end portion 2a is not sufficient to effectively suppress diameter-reducing deformation during heating in the end welding step. , the possibility that an inner surface step or positional deviation may occur after welding cannot be denied. On the other hand, if the ratio (Da/D) of the inner diameter Da at the end surface 4 of the expanded diameter end portion 2a to the inner diameter D of the remaining portion 3 is too large, cracks may occur due to excessive load when the diameter expanding jig 11 is inserted. ), etc. may occur.

また、拡径端部２ａの軸線方向に沿う長さＬは、端部溶着工程での加熱時の縮径変形が生じ得る長さとすることができ、この長さＬを、樹脂製チューブ部材１の端部２の拡径させる範囲とすることができる。 In addition, the length L along the axial direction of the expanded diameter end portion 2a can be set to a length that can cause diameter reduction deformation during heating in the end welding process. can be a range in which the diameter of the end portion 2 of is expanded.

なお、図２に示す手法の他、図示は省略するが、たとえば、樹脂製チューブ部材１の端部２に、収縮した状態のバルーンを挿入し、このバルーンを、端部２の内部で膨張させることにより、端部２の内外径を拡大させて当該端部２を拡径端部とすることもできる。 In addition to the method shown in FIG. 2, although illustration is omitted, for example, a deflated balloon is inserted into the end portion 2 of the resin tube member 1, and the balloon is inflated inside the end portion 2. Thus, the inner and outer diameters of the end portion 2 can be enlarged to make the end portion 2 a diameter-enlarged end portion.

（端部溶着工程）
上述した端部拡径工程を経て得られた拡径端部２ａを有する樹脂製チューブ部材１は、樹脂製管継手もしくは他の樹脂製チューブ部材と連結するための端部溶着工程に供される。そして、このような連結を繰り返して、所期した形状をなす樹脂製配管を製造することができる。 (End welding process)
The resin tube member 1 having the diameter-enlarged end portion 2a obtained through the above-described end diameter enlarging step is subjected to an end welding step for coupling with a resin pipe joint or another resin tube member. . By repeating such connection, a resin pipe having a desired shape can be manufactured.

樹脂製チューブ部材１の拡径端部２ａと樹脂製管継手の端部を互いに溶着する場合は、たとえば、図示しない溶着機の対をなすクランプ治具のそれぞれに、相互に連結しようとする樹脂製チューブ部材の拡径端部及び樹脂製管継手の端部が互いに対向する姿勢で、それらの樹脂製チューブ部材１及び樹脂製管継手のそれぞれを保持させる。その後、図４に示すように、樹脂製チューブ部材１の拡径端部２ａ及び樹脂製管継手２１の端部２２を、ヒーター３１等によって加熱して溶融させる。そしてその状態で、樹脂製チューブ部材１と樹脂製管継手２１とを互いに接近させ、それらの拡径端部２ａ及び端部２２の相互を、所要の圧力の作用により突き合わせる。 When the expanded diameter end portion 2a of the resin tube member 1 and the end portion of the resin pipe joint are to be welded to each other, for example, a pair of clamping jigs of a welding machine (not shown) are used to weld the resin to be connected to each other. The resin tube member 1 and the resin pipe joint are held in a posture in which the enlarged diameter end portion of the resin tube member and the end portion of the resin pipe joint face each other. After that, as shown in FIG. 4, the enlarged diameter end portion 2a of the resin tube member 1 and the end portion 22 of the resin pipe joint 21 are heated by the heater 31 or the like to be melted. Then, in this state, the resin tube member 1 and the resin pipe joint 21 are brought close to each other, and the enlarged diameter end portion 2a and the end portion 22 of them are butted against each other by the action of a required pressure.

ここにおいて、樹脂製チューブ部材１の拡径端部２ａを加熱した際には、拡径端部２ａは先細りになる縮径変形するも、この実施形態では、先述したような端部拡径工程で予め内外径を拡大させていることから、図４に矢印で示すように、拡径端部２ａは、実質的に拡径前の元の寸法に戻ることになる。それにより、樹脂製チューブ部材１の拡径端部２ａが、樹脂製管継手２１の端部２２と同程度の内径となって、溶着後のそこでの内面段差及び位置ずれの発生が防止される。その結果として、拡径端部２ａと端部２２との所要の溶着強度が確保されて、長時間の使用や外力の作用によっても、溶着された拡径端部２ａ及び端部２２での破断やクラックを有効に防止することができる。 Here, when the diameter-enlarged end portion 2a of the resin tube member 1 is heated, the diameter-enlarged end portion 2a is deformed to be tapered. Since the inner and outer diameters are expanded in advance in , the diameter-enlarged end portion 2a substantially returns to its original size before diameter expansion, as indicated by the arrows in FIG. As a result, the diameter-enlarged end portion 2a of the resin tube member 1 has an inner diameter approximately equal to that of the end portion 22 of the resin pipe joint 21, thereby preventing the occurrence of an inner surface step and positional deviation there after welding. . As a result, the required welding strength between the expanded diameter end portion 2a and the end portion 22 is ensured, and the welded expanded diameter end portion 2a and the end portion 22 do not break even when used for a long period of time or by the action of an external force. and cracks can be effectively prevented.

なお、二個の樹脂製チューブ部材のそれぞれの端部どうしを溶着する場合は、一の樹脂製チューブ部材と他の樹脂製チューブ部材とがいずれも、上述した端部拡径工程を経て作製されたものであることが好適である。それにより、それらの各樹脂製チューブ部材で、端部を溶着させる前の加熱溶融時の縮径変形を抑制でき、段差や位置ずれの発生がより有効に防止される。 In addition, when the respective ends of two resin tube members are welded together, both the one resin tube member and the other resin tube member are manufactured through the above-described end portion expanding step. It is preferred that the As a result, it is possible to suppress diameter-reducing deformation during heat-melting before the ends of the resin tube members are welded, thereby more effectively preventing the occurrence of steps and positional deviations.

このようにして製造された配管では、樹脂製チューブ部材と樹脂製管継手もしくは他の樹脂製チューブ部材との連結箇所である溶着された端部間に生じ得る内面の段差が、当該端部で半径方向に沿って測定して、周方向の平均値で０．４ｍｍ以下、さらには０．３ｍｍ以下とすることができる。この段差の平均値は、周方向にて等間隔に４か所の各測定点で、顕微鏡を用いて測った値の平均とする。 In a pipe manufactured in this way, a step on the inner surface that can occur between the welded ends, which are the joints between the resin tube member and the resin pipe joint or other resin tube member, is Measured along the radial direction, the circumferential average may be 0.4 mm or less, or even 0.3 mm or less. The average value of this level difference is the average of the values measured using a microscope at four measurement points equidistantly spaced in the circumferential direction.

１ 樹脂製チューブ部材
２ 端部
２ａ 拡径端部
３ 残部
４ 端面
１１ 拡径治具
１２ 基部
１３ 挿入部
１３ａ 外周面
２１ 樹脂製管継手
２２ 端部
３１ ヒーター
Ｄ 樹脂製チューブ部材の残部の内径
Ｄａ 樹脂製チューブ部材の拡径端部の端面での内径
Ｌ 樹脂製チューブ部材の拡径端部の軸線方向長さ REFERENCE SIGNS LIST 1 resin tube member 2 end 2a expanded diameter end 3 remnant 4 end face 11 diameter expansion jig 12 base 13 insertion portion 13a outer peripheral surface 21 resin pipe joint 22 end 31 heater D inner diameter Da of the remainder of the resin tube member Inner diameter at the end surface of the enlarged diameter end of the resin tube member L Length in the axial direction of the enlarged diameter end of the resin tube member

Claims (6)

樹脂製チューブ部材と樹脂製管継手もしくは他の樹脂製チューブ部材とを連結して、樹脂製配管を製造する方法であって、
樹脂材料から成形した樹脂製チューブ部材の端部の内外径を、該樹脂製チューブ部材の残部の内外径よりも拡大させて、前記端部を拡径端部とする端部拡径工程と、
前記樹脂製チューブ部材の拡径端部、および、該樹脂製チューブ部材に連結する樹脂製管継手もしくは他の樹脂製チューブ部材の端部をともに加熱して溶融させ、当該拡径端部と端部とを突き合わせて溶着する端部溶着工程と
を含み、
前記端部拡径工程後に前記樹脂製チューブ部材の前記拡径端部が縮径し、
前記端部溶着工程を、当該拡径端部の内外径が拡大前の大きさに戻る前に行う、樹脂製配管の製造方法。 A method of manufacturing a resin pipe by connecting a resin tube member and a resin pipe joint or another resin tube member, comprising:
a step of enlarging the inner and outer diameters of the ends of a resin tube member molded from a resin material so as to make the ends larger than the inner and outer diameters of the remaining portion of the resin tube member;
The enlarged diameter end portion of the resin tube member and the end portion of the resin pipe fitting or other resin tube member connected to the resin tube member are heated together to melt, and the enlarged diameter end portion and the end portion are melted together. and an end welding step of welding the parts against each other,
After the step of expanding the diameter of the end portion, the diameter of the expanded end portion of the resin tube member is reduced,
A method for manufacturing a resin pipe , wherein the end welding step is performed before the inner and outer diameters of the expanded diameter end return to the sizes before expansion. 端部拡径工程で、樹脂製チューブ部材の前記端部の内側に、拡径治具を挿入することにより、当該端部の内外径を拡大させる、請求項１に記載の樹脂製配管の製造方法。 2. Manufacture of the resin pipe according to claim 1, wherein in the end portion diameter enlarging step, a diameter enlarging jig is inserted inside the end portion of the resin tube member to expand the inner and outer diameters of the end portion. Method. 前記拡径治具が、樹脂製チューブ部材の端部へ挿入される挿入部を含み、前記挿入部が、先端側から後方側に向かうに従って外径を漸増させたテーパ状の外周面を有する、請求項２に記載の樹脂製配管の製造方法。 The diameter expansion jig includes an insertion portion that is inserted into the end portion of the resin tube member, and the insertion portion has a tapered outer peripheral surface whose outer diameter gradually increases from the tip side toward the rear side. The method for manufacturing a resin pipe according to claim 2. 端部拡径工程で、樹脂製チューブ部材の前記拡径端部を、当該拡径端部の少なくとも一部で該拡径端部の端面側に向かうに従って内外径が漸増するテーパ形状とする、請求項１～３のいずれか一項に記載の樹脂製配管の製造方法。 In the step of increasing the diameter of the end portion, the enlarged diameter end portion of the resin tube member is formed into a tapered shape in which the inner and outer diameters gradually increase toward the end face side of the enlarged diameter end portion at least in part of the enlarged diameter end portion. A method for manufacturing a resin pipe according to any one of claims 1 to 3. 樹脂製チューブ部材と他の樹脂製チューブ部材とを連結するに当り、
端部拡径工程で、前記樹脂製チューブ部材及び他の樹脂製チューブ部材のそれぞれの端部の内外径を拡大させて、それぞれの前記端部を拡径端部とし、
端部溶着工程で、前記樹脂製チューブ部材及び他の樹脂製チューブ部材のそれぞれの拡径端部どうしを溶着させる、請求項１～４のいずれか一項に記載の樹脂製配管の製造方法。 In connecting the resin tube member and another resin tube member,
In an end diameter expanding step, the inner and outer diameters of the ends of the resin tube member and the other resin tube member are expanded to make the respective ends diameter-enlarged ends,
The method for manufacturing a resin pipe according to any one of claims 1 to 4, wherein in the end welding step, the enlarged diameter ends of the resin tube member and the other resin tube member are welded together. 樹脂製チューブ部材と樹脂製管継手とを連結するに当り、
端部拡径工程で、前記樹脂製チューブ部材及び樹脂製管継手のうち、樹脂製チューブ部材のみの端部の内外径を拡大させる、請求項１～４のいずれか一項に記載の樹脂製配管の製造方法。 In connecting the resin tube member and the resin pipe joint,
5. The resin according to any one of claims 1 to 4, wherein, in the end diameter expanding step, the inner and outer diameters of the ends of only the resin tube member out of the resin tube member and the resin pipe joint are expanded. A method of manufacturing piping.
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