JP2021020251A - Method for manufacturing press type pipe fitting - Google Patents

Abstract

To provide easily process and form an annular swelling part internally installing an O ring and a straight pipe part in a socket part of a press type pipe fitting for inserting a connection pipe to the socket part, reducing the diameter of the annular swelling part and both sides thereof, and fixing the connection pipe thereto, with high accuracy in a short time.SOLUTION: An expansion part and a tapered part are adjacently formed in a socket part by insertion of a core bar for diameter expansion, the expansion part and the tapered part are molded by a spinning processing method, and an annular swelling part and a straight pipe part are formed.SELECTED DRAWING: Figure 1

Description

本発明は、配管システムを構成するメカニカル継手のうち、ソケット部に接続管を差し込んだ状態で締め付けて接続するプレス式管継手の、製造方法に関する。 The present invention relates to a method for manufacturing a press-type pipe joint that is fastened and connected with a connection pipe inserted into a socket portion among mechanical joints constituting a piping system.

流体を複数の配管内に流通させる配管システムにおいて、金属製の管継手のソケット部に金属製の接続管（配管）を所定量差し込んだ状態で締め付けて（加締めて）接続する、所謂プレス式の管継手が多用されている。例えば特許第３４３６８２２号に記載されるように、ソケット部に形成された環状膨出部の内側（環状溝）に弾性Ｏリングを装着し、ソケット内に接続管の一端部を所定量差し込んで、その状態に保持したまま環状膨出部およびその両側のソケット部の一部を締め付けて縮径加工し、接続管を気密／液密に固定するものである。 In a piping system that distributes fluid in multiple pipes, a so-called press type is used in which a predetermined amount of metal connection pipes (pipes) are inserted into the sockets of metal pipe joints and then tightened (tightened). Pipe fittings are often used. For example, as described in Japanese Patent No. 3436822, an elastic O-ring is attached to the inside (annular groove) of the annular bulge formed in the socket portion, and a predetermined amount of one end of the connecting pipe is inserted into the socket. While maintaining this state, the annular bulging portion and a part of the socket portions on both sides thereof are tightened to reduce the diameter, and the connecting pipe is airtightly / liquidtightly fixed.

このような管継手は、接続管を収納・固定するソケット部と一般部とから構成される。ソケット部には接続管を挿入する受口が開口しており、その近傍に環状膨出部が一体的に形成される。そして、ソケット部および環状膨出部に接続管を差し込んだ状態で、プレス工具を用いて環状膨出部とその近傍（横のソケット部の一部）を締め付けて縮径加工する。このとき、環状膨出部内に装着されているＯリングが圧縮されて接続管に密着し、シール機能を発現する。そのため、Ｏリングを圧縮する環状膨出部の断面形状が重要となっている。そして、そのような環状膨出部を短時間で容易に加工形成するような、管継手の製造方法が求められている。 Such a pipe joint is composed of a socket portion for accommodating and fixing a connecting pipe and a general portion. A receiving port for inserting a connecting pipe is opened in the socket portion, and an annular bulging portion is integrally formed in the vicinity thereof. Then, with the connecting pipe inserted into the socket portion and the annular bulge portion, the annular bulge portion and its vicinity (a part of the horizontal socket portion) are tightened with a press tool to reduce the diameter. At this time, the O-ring mounted in the annular bulge is compressed and adheres to the connecting pipe to exhibit the sealing function. Therefore, the cross-sectional shape of the annular bulge that compresses the O-ring is important. Then, there is a demand for a method for manufacturing a pipe joint so that such an annular bulge can be easily processed and formed in a short time.

そのようなニーズを満たして環状膨出部を形成すべく、回転塑性加工の一種である転造加工が用いられる。例えば、特許第５３７６４８７号には、Ｏリングは内装しないものの係止のための環状膨出部を管継手部に形成する加工方法であって、管継手部の端部を軸押ししながら内部から回転ローラを押圧することで、回転ローラの形状を転写させる転造工法が開示されている。 Rolling, which is a type of rotary plastic working, is used to satisfy such needs and form an annular bulge. For example, in Japanese Patent No. 5376487, an O-ring is not installed, but an annular bulge for locking is formed in the pipe joint portion, and the end portion of the pipe joint portion is axially pressed from the inside. A rolling method for transferring the shape of a rotating roller by pressing the rotating roller is disclosed.

このような工法によれば、たしかにプレス加工や据込み加工に比べて、環状膨出部を短時間で容易に加工形成することができるが、加工部位の積極的な塑性流動を実現できるものではなく、環状膨出部の断面をＯリングが内装できるような大きさに形成することが困難である。また、回転ローラの形状転写であるため所望断面ごとに回転ローラが必要となり、加工の汎用性も低い。 According to such a construction method, it is possible to easily form the annular bulging portion in a short time as compared with press working and stationary machining, but it is not possible to realize positive plastic flow of the machined part. Therefore, it is difficult to form the cross section of the annular bulge portion so as to be large enough to accommodate the O-ring. Further, since the shape of the rotating roller is transferred, a rotating roller is required for each desired cross section, and the versatility of processing is low.

そこで本発明は、環状膨出部の形成において積極的な材料流動（塑性流動）を実現し、Ｏリングを内装できる断面の大きさおよび任意形状を容易に実現できる、環状膨出部の形成方法を提供するものである。 Therefore, the present invention is a method for forming an annular bulge, which can realize a positive material flow (plastic flow) in forming an annular bulge, and can easily realize a cross-sectional size and an arbitrary shape in which an O-ring can be installed. Is to provide.

前術の課題を解決するために、Ｏリングを内装した環状膨出部を具備するソケット部に接続管を挿入し、前記環状膨出部とその近傍を縮径することで前記接続管を固定するプレス式管継手の製造方法において、ソケット部の開口端部を一定範囲に亘って拡径しテーパ部と拡径部を形成する第１の工程と、該テーパ部と拡径部に亘ってスピニング加工を施し、所望の断面形状の環状膨出部とその先端側に直管部とを形成する第２の工程と、を少なくとも含むこととした。 In order to solve the problem of the previous operation, the connecting pipe is inserted into the socket portion provided with the annular bulging portion containing the O-ring, and the connecting pipe is fixed by reducing the diameter of the annular bulging portion and its vicinity. In the method of manufacturing a press-type pipe joint, the first step of expanding the diameter of the open end of the socket portion over a certain range to form a tapered portion and a diameter-expanded portion, and over the tapered portion and the enlarged diameter portion. It was decided to include at least a second step of performing a spinning process to form an annular bulge portion having a desired cross-sectional shape and a straight pipe portion on the tip end side thereof.

また、スピニング加工においては、ソケット部の少なくとも一部を回転不能に把持し、拡径部とテーパ部に亘ってローラを公転接触させつつローラを管軸方向および放射方向へ移動させて、ソケット部に任意の環状膨出部形状および直管部形状を一体形成するとよい。 Further, in the spinning process, at least a part of the socket portion is non-rotatably gripped, and the roller is moved in the tube axial direction and the radial direction while revolving contacting the roller over the enlarged diameter portion and the tapered portion to move the socket portion. It is preferable to integrally form an arbitrary annular bulging portion shape and a straight pipe portion shape.

また、第１の工程におけるソケット部の拡径により径の異なる２つの拡径部及びテーパ部を形成し、大径の方の拡径部とテーパ部に亘ってスピニング加工を施してもよい。 Further, two diameter-expanded portions and tapered portions having different diameters may be formed by expanding the diameter of the socket portion in the first step, and spinning processing may be performed over the enlarged diameter portion and the tapered portion of the larger diameter portion.

本発明の製造方法によれば、プレス式管継手の環状膨出部の形成において積極的な材料流動（塑性流動）を実現し、Ｏリングを内装可能な任意形状の断面を容易に実現できるものである。 According to the manufacturing method of the present invention, positive material flow (plastic flow) can be realized in the formation of the annular bulge portion of the press type pipe joint, and an arbitrary shape cross section in which the O-ring can be installed can be easily realized. Is.

また、ソケット部の一部を回転不能に把持し、拡径部とテーパ部に亘ってローラを公転接触させつつローラを管軸方向および放射方向へ移動させる、ワーク固定式（ローラ公転式）のスピニング加工を採用することで、クランプができれば、あらゆる形状の管継手（ワーク）の端部に、任意の環状膨出部形状および直管部形状を得ることができる。 In addition, a work fixed type (roller revolution type) that grips a part of the socket part non-rotatably and moves the roller in the pipe axis direction and the radial direction while making the roller revolve around the enlarged diameter part and the tapered part. By adopting the spinning process, if the clamp can be formed, an arbitrary annular bulging portion shape and a straight pipe portion shape can be obtained at the end portion of the pipe joint (work) having any shape.

また、ソケット部の拡径により径の異なる２つの拡径部およびテーパ部が形成されることで、環状膨出部形成用のテーパ部に加えて、内装する接続管のストッパとしてのテーパ部も、同時に形成できて効率的である。 Further, by forming two enlarged diameter portions and tapered portions having different diameters by expanding the diameter of the socket portion, in addition to the tapered portion for forming the annular bulging portion, the tapered portion as a stopper of the connecting pipe to be installed is also provided. , Can be formed at the same time and is efficient.

本発明の第１実施形態に係るプレス式管継手の加工方法の工程を記載した図である。It is a figure which described the process of the processing method of the press type pipe joint which concerns on 1st Embodiment of this invention. 本発明の加工方法に係るプレス式管継手の第１実施形態を記載した図である。It is a figure which described the 1st Embodiment of the press type pipe joint which concerns on the processing method of this invention. 本発明の加工方法に係るプレス式管継手の第２実施形態を記載した図である。It is a figure which described the 2nd Embodiment of the press type pipe joint which concerns on the processing method of this invention.

以下、本発明の望ましい実施形態について図１を参照して説明する。 Hereinafter, desirable embodiments of the present invention will be described with reference to FIG.

図１に本発明の第１実施形態に係るプレス式管継手３におけるソケット部２０の製造方法を（ａ）、（ｂ）、（ｃ）のステップごとに説明する。図（ａ）の工程は、管継手３（およびソケット部）の素材である素材管１を図示しないクランプ装置にて強固に把持した状態を示す。素材管１の管端には開口部２が開口しており、ここから素材管１内へ、次工程（ｂ）において拡径加工用のマンドレル（芯金）４を挿入し、図示しない慣用の押圧手段によりα方向へ押し込む。 FIG. 1 describes a method of manufacturing the socket portion 20 in the press-type pipe joint 3 according to the first embodiment of the present invention for each step (a), (b), and (c). The process of FIG. (A) shows a state in which the material pipe 1 which is the material of the pipe joint 3 (and the socket portion) is firmly gripped by a clamp device (not shown). An opening 2 is opened at the end of the material pipe 1, and a mandrel (core metal) 4 for diameter expansion processing is inserted into the material pipe 1 from here in the next step (b). Push in the α direction by the pressing means.

図（ｂ）は、素材管１内へマンドレル４が所定量押し込まれて素材管１が拡径加工された結果、素材管１の端部に開口部１２、大径部１３、屈曲部１８、テーパ部１４、中径部１５、テーパ部１６、小径部１７（素材管１）が連続的に形成された状態を示す。開口部１２と大径部１３と屈曲部１８はマンドレル４の大径部５によって、テーパ部１４、中径部１５、テーパ部１６はそれぞれマンドレル４のテーパ部６、中径部７、テーパ部８によってそれぞれ拡管形成された。なお、小径部１７は素材管１のままであり、非加工部である。以上が第１の工程である。そして、第２の工程においては、図（ｂ）に示すβ範囲に亘ってスピニング加工法による成形を施す。 In FIG. (B), as a result of the mandrel 4 being pushed into the material pipe 1 by a predetermined amount and the material pipe 1 being expanded in diameter, an opening 12, a large diameter portion 13, and a bent portion 18 are formed at the ends of the material pipe 1. A state in which the tapered portion 14, the medium diameter portion 15, the tapered portion 16, and the small diameter portion 17 (material pipe 1) are continuously formed is shown. The opening 12, the large diameter portion 13, and the bent portion 18 are formed by the large diameter portion 5 of the mandrel 4, and the tapered portion 14, the medium diameter portion 15, and the tapered portion 16 are the tapered portion 6, the medium diameter portion 7, and the tapered portion of the mandrel 4, respectively. Each of the tubes was expanded by 8. The small diameter portion 17 is still the material pipe 1 and is a non-processed portion. The above is the first step. Then, in the second step, molding is performed by the spinning processing method over the β range shown in FIG.

スピニング加工法は回転塑性加工の一種であり回転ローラによるパイプ絞り加工であるが、その中でも本発明においてはワーク非回転かつローラ公転式のスピニング加工法を選択する。すなわち、素材管１の軸芯と同軸の軌道上を公転する複数個のスピニングローラ２１が、前述のβ範囲に亘って公転接触しつつ管軸方向および放射方向へ移動することで、任意の環状膨出部２５形状および先端部２４の形状を得るものである。具体的には、テーパ部１４と大径部１３にスピニング施工することで環状膨出部２５を成形し、大径部１３をスピニング施工することで先端部２４を得る。 The spinning method is a kind of rotary plastic working and is a pipe drawing process using a rotating roller. Among them, in the present invention, a non-rotating work and roller revolving spinning method is selected. That is, a plurality of spinning rollers 21 revolving on an orbit coaxial with the axis of the material tube 1 move in the tube axis direction and the radial direction while revolving in contact with each other over the β range described above, thereby forming an arbitrary annular shape. The shape of the bulging portion 25 and the shape of the tip portion 24 are obtained. Specifically, the annular bulging portion 25 is formed by spinning the tapered portion 14 and the large diameter portion 13, and the tip portion 24 is obtained by spinning the large diameter portion 13.

このとき、テーパ部１４だけでなく隣接する中径部１５の端部から開始してスピニング加工を施すと、環状膨出部２５の断面形状を正確に実現できるので、β範囲に亘ってスピニング施工することが好ましい。しかしながら、テーパ部１４形状はそのままで屈曲部１８よりも先端側だけの形状変更を望む場合には、γ範囲だけスピニング施工を施してもよい。 At this time, if the spinning process is performed starting from the end portion of the adjacent medium diameter portion 15 as well as the tapered portion 14, the cross-sectional shape of the annular bulging portion 25 can be accurately realized, so that the spinning operation is performed over the β range. It is preferable to do so. However, if it is desired to change the shape of the tapered portion 14 only on the tip side of the bent portion 18 as it is, the spinning operation may be performed only in the γ range.

以上のようなスピング施工によってソケット部２０に、小径部１７〜テーパ部１６〜中間部２７〜環状膨出部２５〜先端部２４を連続して形成できる。もちろん環状膨出部２５の内側には、Ｏリングを内装するための環状内溝２６が形成される。 By the spinging construction as described above, the small diameter portion 17 to the tapered portion 16 to the intermediate portion 27 to the annular bulging portion 25 to the tip portion 24 can be continuously formed in the socket portion 20. Of course, an annular inner groove 26 for incorporating the O-ring is formed inside the annular bulge portion 25.

図２は、本発明の加工方法に係る第１実施形態をプレス式管継手３０である。形状としてはストレート状の一般的な、独立したプレス式管継手である。素材管のままである小径部３７の両側に、上述の工程にて、ソケット部３１と３２、先端部３３と４１、環状膨出部３４と４０、中間部３５と３９、テーパ部３６と３８を同軸上にそれぞれ形成した。 FIG. 2 shows a press type pipe joint 30 according to the first embodiment according to the processing method of the present invention. The shape is a straight, general, independent press type pipe joint. Socket portions 31 and 32, tip portions 33 and 41, annular bulging portions 34 and 40, intermediate portions 35 and 39, and tapered portions 36 and 38 on both sides of the small diameter portion 37 which remains as a material tube in the above-mentioned steps. Was formed coaxially.

図４は、本発明の加工方法に係る第２実施形態のプレス式管継手５０である。プレス式管継手５０は、独立した管継手ではなく、接続管５１と一体化された（接続管５１の端部に一体形成された）ものであり、ソケット部５２がすなわちプレス式管継手５０（ソケット部）を構成している。このように、任意の形状／長さの接続管の端部に、本発明のプレス式管継手を一体化してもよい。本発明の製法によれば、ワーク（被スピニング加工物）を回転させずスピニングローラがワーク周囲を公転する所謂「ワーク固定式」のスピニング加工法であるので、長尺や複雑な形状の接続管の端部にも、本発明のプレス式管継手を一体形成できる。 FIG. 4 is a press-type pipe joint 50 of the second embodiment according to the processing method of the present invention. The press-type pipe joint 50 is not an independent pipe joint, but is integrated with the connection pipe 51 (integrally formed at the end of the connection pipe 51), and the socket portion 52 is the press-type pipe joint 50 (that is, the press-type pipe joint 50 ( Socket part). In this way, the press type pipe joint of the present invention may be integrated with the end of the connecting pipe having an arbitrary shape / length. According to the manufacturing method of the present invention, since it is a so-called "work fixed type" spinning method in which the spinning roller revolves around the work without rotating the work (work piece to be spun), a connecting pipe having a long or complicated shape is used. The press-type pipe joint of the present invention can be integrally formed at the end of the pipe.

以上、本発明の実施形態を説明してきたが、本発明は上記の実施形態に限られるものではなく、本発明の趣旨を逸脱し範囲の変更があっても本発明に包含される。 Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and even if there is a change in the scope deviating from the gist of the present invention, the present invention is included in the present invention.

１ 素材管
２０，３１，３２，５２ ソケット部
２１ スピニングローラ
２６ 環状膨出部
３、３０、５０ プレス式管継手1 Material pipe 20, 31, 32, 52 Socket part 21 Spinning roller 26 Ring bulge part 3, 30, 50 Press type pipe joint

Claims (3)

Ｏリングを内装した環状膨出部を具備するソケット部に接続管を挿入し、前記環状膨出部とその近傍を縮径することで前記接続管を固定するプレス式管継手の製造方法であって、
ソケット部の開口端部を一定範囲に亘って拡径しテーパ部と拡径部を形成する第１の工程と、
該テーパ部と拡径部に亘ってスピニング加工を施し、所望の断面形状の環状膨出部とその先端側に直管部とを形成する第２の工程と、
を少なくとも含むことを特徴とするプレス式管継手の製造方法。This is a method for manufacturing a press-type pipe joint in which a connecting pipe is inserted into a socket portion having an annular bulging portion having an O-ring inside, and the connecting pipe is fixed by reducing the diameter of the annular bulging portion and its vicinity. hand,
The first step of expanding the diameter of the open end of the socket portion over a certain range to form a tapered portion and an enlarged diameter portion,
A second step of performing spinning processing over the tapered portion and the enlarged diameter portion to form an annular bulging portion having a desired cross-sectional shape and a straight pipe portion on the tip end side thereof.
A method for manufacturing a press-type pipe fitting, which comprises at least. 前記スピニング加工において、少なくとも前記ソケット部の一部を回転不能に把持し、前記拡径部とテーパ部に亘ってローラを公転接触させつつ該ローラを管軸方向および放射方向へ移動させ任意の環状膨出部形状および直管部形状を得ることを特徴とする、
請求項１に記載のプレス式管継手の製造方法。In the spinning process, at least a part of the socket portion is non-rotatably gripped, and the roller is moved in the tube axial direction and the radial direction while revolving contacting the roller over the enlarged diameter portion and the tapered portion to form an arbitrary annular shape. It is characterized by obtaining a bulging portion shape and a straight pipe portion shape.
The method for manufacturing a press-type pipe joint according to claim 1. 前記第１の工程におけるソケット部の拡径により径の異なる２つの拡径部及びテーパ部が形成され、大径の方の拡径部とテーパ部に亘って前記スピニング加工が施されることを特徴とする、
請求項１又は請求項２に記載のプレス式管継手の製造方法。By expanding the diameter of the socket portion in the first step, two enlarged diameter portions and tapered portions having different diameters are formed, and the spinning process is performed over the enlarged diameter portion and the tapered portion of the larger diameter portion. Characteristic,
The method for manufacturing a press-type pipe fitting according to claim 1 or 2.

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