JP2011167951A

JP2011167951A - Method of manufacturing metal/frp pipe, metal/frp pipe and method of removing heat residual stress of metal/frp pipe

Info

Publication number: JP2011167951A
Application number: JP2010034248A
Authority: JP
Inventors: Ryuhei Aoki; 隆平青木; Toshihiro Yokozeki; 智弘横関; Shunei Nakajima; 俊英中島; Shigeki Higashi; 成希東
Original assignee: HIMECS KK; THREE HOPE KK
Current assignee: HIMECS KK; THREE HOPE KK
Priority date: 2010-02-19
Filing date: 2010-02-19
Publication date: 2011-09-01
Anticipated expiration: 2030-02-19
Also published as: JP5161903B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a metal/FRP pipe comprising inserting, into a metal tube, a core rod attached with an FRP prepreg impregnated with a thermoplastic resin on the outer periphery, expanding the core rod by heating until the FRP prepreg softens, pressing the outermost periphery of the FRP prepreg toward the inner peripheral surface of the metal tube, raising the heating temperature to harden the FRP prepreg, adhering the outermost periphery of the FRP prepreg to the inner peripheral surface of the metal tube in an integrated form, cooling to ordinary temperature to make the core rod shrink and removing the core rod from the metal tube, a metal/FRP pipe which is manufactured by the manufacturing method and whose tensile heat residual stress occurring in a metal layer composed of the metal tube on returning to ordinary temperature is removed and a method of removing a heat residual stress. <P>SOLUTION: A tensile load is applied to the whole of the metal/FRP pipe until the value of the yield strain (ε<SP>Y</SP><SB>metal</SB>) of the metal layer plus the residual strain (ε<SP>T</SP><SB>metal</SB>) reaches a predetermined value of strain, and the load is removed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

この発明は、印刷用ロールや、フィルムや紙などのシート類繰り出し・巻き取り用ロール、液晶パネルやフラットパネルディスプレーなどのパネル類搬送用ロール、その他の各種回転ロールに使用される繊維強化樹脂ライニング金属管に関する。特に、成形時に、金属パイプ内面に繊維強化樹脂（Fiber Reinforced Plastics）が一体化される複合パイプ（以下「金属／ＦＲＰパイプ」と表す）の金属層に残る熱残留応力を除去した金属／ＦＲＰパイプの製造方法及び金属／ＦＲＰパイプ、並びに、金属／ＦＲＰパイプの熱残留応力除去方法に関する。 This invention is a fiber reinforced resin lining used for printing rolls, rolls for taking out and winding sheets such as film and paper, rolls for transporting panels such as liquid crystal panels and flat panel displays, and other various rotating rolls. It relates to metal tubes. In particular, a metal / FRP pipe in which the residual thermal stress remaining in the metal layer of a composite pipe (hereinafter referred to as “metal / FRP pipe”) in which fiber reinforced resin (Fiber Reinforced Plastics) is integrated with the inner surface of the metal pipe during molding is removed. The present invention relates to a metal / FRP pipe and a method for removing thermal residual stress from the metal / FRP pipe.

金属／ＦＲＰパイプとしては従来から種々の提案がされており、特許文献１には、高剛性（耐摩耗性）と軽量さ（低慣性モーメント）が特に要求される各種高速回転（例えば、約１０００〜２０００ｒ．ｐ．ｍ）ロール用のＦＲＰライニング金属管の製造方法が提案されている。 Various proposals have hitherto been made for metal / FRP pipes, and Patent Document 1 discloses various high-speed rotations (for example, about 1000) that particularly require high rigidity (wear resistance) and light weight (low moment of inertia). A method for producing FRP-lined metal tubes for rolls up to 2000 rpm) has been proposed.

ここで提案されている製造方法は、あらかじめエポキシ樹脂やフェノール樹脂などの熱硬化性樹脂が含浸された炭素繊維プリプレグを芯棒（マンドレル）へ巻き付け、その芯棒をアルミ合金やステンレス鋼などからなる金属管の内部へ挿入し、次いで前記プリプレグが軟化する温度まで加熱して前記芯棒を膨張させて前記金属管への内張り状態に押し付け、更に加熱温度を上げて、前記プリプレグを完全に硬化させ、最後に常温まで冷却することにより、前記芯棒を収縮復元させて抜き出すものである。 In the manufacturing method proposed here, a carbon fiber prepreg impregnated with a thermosetting resin such as an epoxy resin or a phenol resin is wound around a mandrel, and the mandrel is made of an aluminum alloy or stainless steel. Insert into the inside of the metal tube, then heat up to a temperature at which the prepreg softens to expand the core rod and press it into the lining state on the metal tube, and further raise the heating temperature to completely cure the prepreg Finally, the core rod is contracted and restored by cooling to room temperature.

本願の発明者もこのような金属／ＦＲＰパイプの製造法についての提案を行っている（特許文献２） The inventor of the present application has also proposed a method for manufacturing such a metal / FRP pipe (Patent Document 2).

特開２０００−１４１４８５号公報JP 2000-141485 A 特開２００６−３３４８０５号公報JP 2006-334805 A

上述した従来提案されている金属／ＦＲＰパイプの製造法は、熱硬化性樹脂が含浸されたＦＲＰプリプレグが外周に装着されている芯棒を金属管の内部へ挿入し、前記ＦＲＰプリプレグが軟化するまで加熱して前記芯棒を膨張させ、前記ＦＲＰプリプレグの最外周を前記金属管の内周面に押し付け、更に加熱温度を上げて前記ＦＲＰプリプレグを硬化させ、前記ＦＲＰプリプレグの最外周を前記金属管の内周面に張り付けて一体化し、その後、常温まで冷却して前記芯棒を収縮させ、前記芯棒を前記金属管から抜き取るものである。すなわち、芯棒の外周に装着されているＦＲＰプリプレグの加熱による軟化と、芯棒の膨張・収縮とを利用し、熱硬化性樹脂が含浸されたＦＲＰプリプレグが外周に装着されている芯棒が内部に挿入された金属管と、その内周に成形される前記ＦＲＰプリプレグが硬化したＦＲＰパイプとを加熱成形時に一体化するものである。 In the conventional method for manufacturing a metal / FRP pipe described above, a core rod having a FRP prepreg impregnated with a thermosetting resin is inserted into the metal tube, and the FRP prepreg is softened. The core rod is expanded by heating up, the outermost periphery of the FRP prepreg is pressed against the inner peripheral surface of the metal tube, the heating temperature is further increased to cure the FRP prepreg, and the outermost periphery of the FRP prepreg is It is attached to the inner peripheral surface of the tube and integrated, and then cooled to room temperature to contract the core rod, and the core rod is extracted from the metal tube. That is, a core rod in which an FRP prepreg impregnated with a thermosetting resin is attached to the outer periphery using the softening of the FRP prepreg attached to the outer periphery of the core rod by heating and the expansion / contraction of the core rod. The metal pipe inserted inside and the FRP pipe cured on the FRP prepreg formed on the inner periphery thereof are integrated at the time of heat forming.

そして、特許文献２記載の発明によれば、耐久強度と安定性に優れた金属／ＦＲＰパイプを短時間で効率よく製造することができた等の優れた効果が発揮されている。 And according to invention of patent document 2, the outstanding effect that the metal / FRP pipe excellent in durability strength and stability was able to be manufactured efficiently in a short time is exhibited.

ところで、前述した製造方法で製造した金属／ＦＲＰパイプの場合、常温に戻した際に前記の金属管からなる金属層に引っ張りの熱残留応力が生じる。これは、加熱成形時に金属管と、その内周に成形されるＦＲＰパイプとが一体化することから引き起こされるものである。 By the way, in the case of the metal / FRP pipe manufactured by the manufacturing method described above, a tensile thermal residual stress is generated in the metal layer made of the metal tube when the temperature is returned to room temperature. This is caused by the integration of the metal tube and the FRP pipe formed on the inner periphery thereof at the time of heat forming.

このような熱残留応力は製造された金属／ＦＲＰパイプの精度に好ましくない影響を与える。 Such thermal residual stress adversely affects the accuracy of the manufactured metal / FRP pipe.

そこで、本発明は、熱硬化性樹脂が含浸されたＦＲＰプリプレグが外周に装着されている芯棒を金属管の内部へ挿入し、前記ＦＲＰプリプレグが軟化するまで加熱して前記芯棒を膨張させ、前記ＦＲＰプリプレグの最外周を前記金属管の内周面に押し付け、更に加熱温度を上げて前記ＦＲＰプリプレグを硬化させ、前記ＦＲＰプリプレグの最外周を前記金属管の内周面に張り付けて一体化し、その後、常温まで冷却して前記芯棒を収縮させ、前記芯棒を前記金属管から抜き取る金属／ＦＲＰパイプの製造法において、かかる製造工程で常温に戻した際に前記の金属管からなる金属層に生じる引っ張りの熱残留応力が除去された金属／ＦＲＰパイプ及び、その製造方法、並びに、金属／ＦＲＰパイプの熱残留応力除去方法を提案することを目的にしている。 Therefore, the present invention inserts a core rod having a FRP prepreg impregnated with a thermosetting resin into the outer periphery thereof, and heats the FRP prepreg until it softens to expand the core rod. The outermost periphery of the FRP prepreg is pressed against the inner peripheral surface of the metal tube, the heating temperature is further increased to cure the FRP prepreg, and the outermost periphery of the FRP prepreg is attached to the inner peripheral surface of the metal tube to be integrated. Then, in the method of manufacturing a metal / FRP pipe in which the core rod is contracted by cooling to room temperature and the core rod is extracted from the metal tube, the metal comprising the metal tube when the temperature is returned to normal temperature in the manufacturing process. The purpose of the present invention is to propose a metal / FRP pipe from which the thermal residual stress of tension generated in the layer has been removed, a method for producing the same, and a method for removing the thermal residual stress from the metal / FRP pipe It is.

本願の請求項１記載の発明は、
熱硬化性樹脂が含浸されたＦＲＰプリプレグが外周に装着されている芯棒を金属管の内部へ挿入し、
前記ＦＲＰプリプレグが軟化するまで加熱して前記芯棒を膨張させ、前記ＦＲＰプリプレグの最外周を前記金属管の内周面に押し付け、
更に加熱温度を上げて前記ＦＲＰプリプレグを硬化させ、前記ＦＲＰプリプレグの最外周を前記金属管の内周面に張り付けて一体化し、
その後、常温まで冷却して前記芯棒を収縮させ、前記芯棒を前記金属管から抜き取った金属／ＦＲＰパイプの全体に対して、所定のひずみ値になるまで引っ張り荷重を加え、次いで、除荷して
金属／ＦＲＰパイプを製造する方法である。 The invention according to claim 1 of the present application is
Insert a core rod with FRP prepreg impregnated with thermosetting resin on the outer periphery into the inside of the metal tube,
Heating until the FRP prepreg is softened to expand the core rod, pressing the outermost periphery of the FRP prepreg against the inner peripheral surface of the metal tube,
Further, the heating temperature is raised to cure the FRP prepreg, and the outermost periphery of the FRP prepreg is attached to the inner peripheral surface of the metal tube to be integrated,
Thereafter, the core rod is contracted by cooling to room temperature, and a tensile load is applied to the entire metal / FRP pipe with the core rod extracted from the metal tube until a predetermined strain value is obtained. Thus, a metal / FRP pipe is manufactured.

本願の請求項２記載の発明は、
芯棒を金属管から抜き取った金属／ＦＲＰパイプの全体に対して所定のひずみ値になるまで引っ張り荷重を加える工程は、
前記金属／ＦＲＰパイプの両端の開口部をそれぞれチャックで掴んで前記金属／ＦＲＰパイプを軸方向に引き伸ばすものであり、
当該チャックは、それぞれ、前記金属／ＦＲＰパイプの開口部が装入されるチャック開口部を備えている筒状で、中心部に内側押圧部を有し、当該内側押圧部を中心にして径方向外側に向かって、当該内側押圧部の外周側に内側挟持部、当該内側挟持部の外周側に外側挟持部、当該外側挟持部の外周側に外側押圧部を備えていて、
前記内側押圧部は、前記チャック開口部側に向かうにつれて拡径し、中心軸が延びる方向において、前記チャック開口部側に向かう方向に前進および、前記チャック開口部側から離れる方向に後退可能で、
前記内側挟持部は、前記金属／ＦＲＰパイプの内周壁に対応する形状の外周壁を備えていて、当該外周壁の周長が大きくなる方向及び小さくなる方向に拡径及び縮径可能であると共に、軸方向に延びる分割溝によって、円周方向において所定の間隔をあけて複数の内側挟持片に分割されており、
前記外側挟持部は前記内側挟持部との間に径方向に所定の間隔を有する隙間を介して配置され、前記金属／ＦＲＰパイプの外周壁に対応する形状の内周壁を備えていて、当該内周壁の周長が小さくなる方向及び大きくなる方向に縮径及び拡径可能であると共に、軸方向に延びる分割溝によって、円周方向において所定の間隔をあけて複数の外側挟持片に分割されており、当該外側挟持片の内周壁に掛止部を有し、
前記外側押圧部は、前記チャック開口部側に向かうにつれて縮径する内周壁を備えており、中心軸が延びる方向において、前記チャック開口部側に向かう方向に前進および、前記チャック開口部側から離れる方向に後退可能で、
前記金属／ＦＲＰパイプの両端開口部の周壁が前記内側挟持部と前記外側挟持部との間に存在する径方向の隙間に挿入されるように前記金属／ＦＲＰパイプの両端開口部にそれぞれ前記チャック開口部を装着した後、
前記内側押圧部を後退させることによって前記内側挟持部の各内側挟持片を拡径方向に移動させて内側挟持片の外周壁を前記金属／ＦＲＰパイプの内周壁に当接させ、
前記外側押圧部を後退させることによって前記外側挟持部の各外側挟持片を縮径方向に移動させて外側挟持片の内周壁に配備されている掛止部を前記金属／ＦＲＰパイプの外周壁に掛止させつつ前記金属／ＦＲＰパイプの外周壁を軸方向で外側に向かって引き伸ばす
ことにより、金属／ＦＲＰパイプの全体を軸方向に延びるように引っ張るものであることを特徴とする請求項１記載の金属／ＦＲＰパイプを製造する方法である。 The invention according to claim 2 of the present application is
The process of applying a tensile load until the predetermined strain value is obtained for the entire metal / FRP pipe with the core rod extracted from the metal pipe,
The opening of both ends of the metal / FRP pipe is gripped by chucks, and the metal / FRP pipe is stretched in the axial direction.
Each of the chucks has a cylindrical shape having a chuck opening into which the opening of the metal / FRP pipe is inserted, has an inner pressing portion at the center, and is radially oriented around the inner pressing portion. Toward the outside, the inner pressing part on the outer peripheral side of the inner pressing part, the outer clamping part on the outer peripheral side of the inner clamping part, and the outer pressing part on the outer peripheral side of the outer clamping part,
The inner pressing portion increases in diameter toward the chuck opening side, and can advance in the direction toward the chuck opening side and retreat in the direction away from the chuck opening side in the direction in which the central axis extends.
The inner clamping portion includes an outer peripheral wall having a shape corresponding to the inner peripheral wall of the metal / FRP pipe, and can be expanded and contracted in a direction in which the peripheral length of the outer peripheral wall increases and decreases. The axially divided grooves are divided into a plurality of inner clamping pieces at predetermined intervals in the circumferential direction,
The outer holding portion is disposed through a gap having a predetermined gap in the radial direction between the outer holding portion and an inner peripheral wall having a shape corresponding to the outer peripheral wall of the metal / FRP pipe. The peripheral wall can be reduced in diameter and increased in the direction in which the peripheral length becomes smaller and larger, and is divided into a plurality of outer clamping pieces at predetermined intervals in the circumferential direction by dividing grooves extending in the axial direction. And has a latching portion on the inner peripheral wall of the outer clamping piece,
The outer pressing portion includes an inner peripheral wall that decreases in diameter toward the chuck opening, moves forward in the direction toward the chuck opening, and moves away from the chuck opening in the direction in which the central axis extends. Reversible in the direction,
The chucks are respectively provided at both end openings of the metal / FRP pipe so that peripheral walls of both end openings of the metal / FRP pipe are inserted into radial gaps existing between the inner sandwiching portion and the outer sandwiching portion. After installing the opening,
Retreating the inner pressing part to move each inner clamping piece of the inner clamping part in the diameter increasing direction to bring the outer peripheral wall of the inner clamping piece into contact with the inner peripheral wall of the metal / FRP pipe;
By retracting the outer pressing portion, each outer clamping piece of the outer clamping portion is moved in the diameter reducing direction so that a latching portion provided on the inner peripheral wall of the outer clamping piece is provided on the outer peripheral wall of the metal / FRP pipe. 2. The metal / FRP pipe is stretched in the axial direction by pulling the outer peripheral wall of the metal / FRP pipe outward in the axial direction while being latched. This is a method for manufacturing a metal / FRP pipe.

本願の請求項３記載の発明は、
前記所定のひずみ値が、「前記金属管から構成される金属層の降伏ひずみ（ε^Ｙ _金属）＋前記金属管から構成される金属層の残留ひずみ（ε^Ｔ _金属）」であることを特徴とする請求項１又は２記載の金属／ＦＲＰパイプを製造する方法である。 Invention of Claim 3 of this application is
The predetermined strain value is “yield strain of the metal layer composed of the metal tube (ε ^Y _metal ) + residual strain of the metal layer composed of the metal tube (ε ^T _metal )” A method for producing a metal / FRP pipe according to claim 1 or 2.

本願の請求項４記載の発明は、
請求項１乃至３のいずれか一項記載の金属／ＦＲＰパイプを製造する方法により製造した金属／ＦＲＰパイプである。 Invention of Claim 4 of this application is
A metal / FRP pipe manufactured by the method for manufacturing a metal / FRP pipe according to any one of claims 1 to 3.

本願の請求項５記載の発明は、
熱硬化性樹脂が含浸されたＦＲＰプリプレグが外周に装着されている芯棒を金属管の内部へ挿入し、
前記ＦＲＰプリプレグが軟化するまで加熱して前記芯棒を膨張させ、前記ＦＲＰプリプレグの最外周を前記金属管の内周面に押し付け、
更に加熱温度を上げて前記ＦＲＰプリプレグを硬化させ、前記ＦＲＰプリプレグの最外周を前記金属管の内周面に張り付けて一体化し、
その後、常温まで冷却して前記芯棒を収縮させ、前記芯棒を前記金属管から抜き取って製造した金属／ＦＲＰパイプの前記金属管から構成される金属層の残留応力を除去する方法であって、
前記金属／ＦＲＰパイプの全体に対して、所定のひずみ値になるまで引っ張り荷重を加え、次いで、除荷ことを特徴とする金属／ＦＲＰパイプの熱残留応力除去方法である。 The invention according to claim 5 of the present application is
Insert a core rod with FRP prepreg impregnated with thermosetting resin on the outer periphery into the inside of the metal tube,
Heating until the FRP prepreg is softened to expand the core rod, pressing the outermost periphery of the FRP prepreg against the inner peripheral surface of the metal tube,
Further, the heating temperature is raised to cure the FRP prepreg, and the outermost periphery of the FRP prepreg is attached to the inner peripheral surface of the metal tube to be integrated,
Thereafter, the core rod is contracted by cooling to room temperature, and the residual stress of the metal layer composed of the metal tube of the metal / FRP pipe manufactured by extracting the core rod from the metal tube is removed. ,
A method for removing thermal residual stress from a metal / FRP pipe, wherein a tensile load is applied to the entire metal / FRP pipe until a predetermined strain value is reached, and then the load is unloaded.

本願の請求項６記載の発明は、
前記金属／ＦＲＰパイプの全体に対して所定のひずみ値になるまで引っ張り荷重を加える工程は、
前記金属／ＦＲＰパイプの両端の開口部をそれぞれチャックで掴んで前記金属／ＦＲＰパイプを軸方向に引き伸ばすものであり、
当該チャックは、それぞれ、前記金属／ＦＲＰパイプの開口部が装入されるチャック開口部を備えている筒状で、中心部に内側押圧部を有し、当該内側押圧部を中心にして径方向外側に向かって、当該内側押圧部の外周側に内側挟持部、当該内側挟持部の外周側に外側挟持部、当該外側挟持部の外周側に外側押圧部を備えていて、
前記内側押圧部は、前記チャック開口部側に向かうにつれて拡径し、中心軸が延びる方向において、前記チャック開口部側に向かう方向に前進および、前記チャック開口部側から離れる方向に後退可能で、
前記内側挟持部は、前記金属／ＦＲＰパイプの内周壁に対応する形状の外周壁を備えていて、当該外周壁の周長が大きくなる方向及び小さくなる方向に拡径及び縮径可能であると共に、軸方向に延びる分割溝によって、円周方向において所定の間隔をあけて複数の内側挟持片に分割されており、
前記外側挟持部は前記内側挟持部との間に径方向に所定の間隔を有する隙間を介して配置され、前記金属／ＦＲＰパイプの外周壁に対応する形状の内周壁を備えていて、当該内周壁の周長が小さくなる方向及び大きくなる方向に縮径及び拡径可能であると共に、軸方向に延びる分割溝によって、円周方向において所定の間隔をあけて複数の外側挟持片に分割されており、当該外側挟持片の内周壁に掛止部を有し、
前記外側押圧部は、前記チャック開口部側に向かうにつれて縮径する内周壁を備えており、中心軸が延びる方向において、前記チャック開口部側に向かう方向に前進および、前記チャック開口部側から離れる方向に後退可能で、
前記金属／ＦＲＰパイプの両端開口部の周壁が前記内側挟持部と前記外側挟持部との間に存在する径方向の隙間に挿入されるように前記金属／ＦＲＰパイプの両端開口部にそれぞれ前記チャック開口部を装着した後、
前記内側押圧部を後退させることによって前記内側挟持部の各内側挟持片を拡径方向に移動させて内側挟持片の外周壁を前記金属／ＦＲＰパイプの内周壁に当接させ、
前記外側押圧部を後退させることによって前記外側挟持部の各外側挟持片を縮径方向に移動させて外側挟持片の内周壁に配備されている掛止部を前記金属／ＦＲＰパイプの外周壁に掛止させつつ前記金属／ＦＲＰパイプの外周壁を軸方向で外側に向かって引き伸ばす
ことにより、金属／ＦＲＰパイプの全体を軸方向に延びるように引っ張るものであることを特徴とする請求項５記載の金属／ＦＲＰパイプの熱残留応力除去方法である。 The invention according to claim 6 of the present application is
The step of applying a tensile load until a predetermined strain value is obtained with respect to the entire metal / FRP pipe,
The opening of both ends of the metal / FRP pipe is gripped by chucks, and the metal / FRP pipe is stretched in the axial direction.
Each of the chucks has a cylindrical shape having a chuck opening into which the opening of the metal / FRP pipe is inserted, has an inner pressing portion at the center, and is radially oriented around the inner pressing portion. Toward the outside, the inner pressing part on the outer peripheral side of the inner pressing part, the outer clamping part on the outer peripheral side of the inner clamping part, and the outer pressing part on the outer peripheral side of the outer clamping part,
The inner pressing portion increases in diameter toward the chuck opening side, and can advance in the direction toward the chuck opening side and retreat in the direction away from the chuck opening side in the direction in which the central axis extends.
The inner clamping portion includes an outer peripheral wall having a shape corresponding to the inner peripheral wall of the metal / FRP pipe, and can be expanded and contracted in a direction in which the peripheral length of the outer peripheral wall increases and decreases. The axially divided grooves are divided into a plurality of inner clamping pieces at predetermined intervals in the circumferential direction,
The outer holding portion is disposed through a gap having a predetermined gap in the radial direction between the outer holding portion and an inner peripheral wall having a shape corresponding to the outer peripheral wall of the metal / FRP pipe. The peripheral wall can be reduced in diameter and increased in the direction in which the peripheral length becomes smaller and larger, and is divided into a plurality of outer clamping pieces at predetermined intervals in the circumferential direction by dividing grooves extending in the axial direction. And has a latching portion on the inner peripheral wall of the outer clamping piece,
The outer pressing portion includes an inner peripheral wall that decreases in diameter toward the chuck opening, moves forward in the direction toward the chuck opening, and moves away from the chuck opening in the direction in which the central axis extends. Reversible in the direction,
The chucks are respectively provided at both end openings of the metal / FRP pipe so that peripheral walls of both end openings of the metal / FRP pipe are inserted into radial gaps existing between the inner sandwiching portion and the outer sandwiching portion. After installing the opening,
Retreating the inner pressing part to move each inner clamping piece of the inner clamping part in the diameter increasing direction to bring the outer peripheral wall of the inner clamping piece into contact with the inner peripheral wall of the metal / FRP pipe;
By retracting the outer pressing portion, each outer clamping piece of the outer clamping portion is moved in the diameter reducing direction so that a latching portion provided on the inner peripheral wall of the outer clamping piece is provided on the outer peripheral wall of the metal / FRP pipe. 6. The metal / FRP pipe is pulled so as to extend in the axial direction by extending the outer peripheral wall of the metal / FRP pipe in the axial direction outward while being hooked. This is a method for removing thermal residual stress from metal / FRP pipes.

本願の請求項７記載の発明は、
前記所定のひずみ値が、「前記金属管から構成される金属層の降伏ひずみ（ε^Ｙ _金属）＋前記金属管から構成される金属層の残留ひずみ（ε^Ｔ _金属）」であることを特徴とする請求項５又は６記載の金属／ＦＲＰパイプの熱残留応力除去方法である。 The invention according to claim 7 of the present application is
The predetermined strain value is “yield strain of the metal layer composed of the metal tube (ε ^Y _metal ) + residual strain of the metal layer composed of the metal tube (ε ^T _metal )” The method for removing a thermal residual stress from a metal / FRP pipe according to claim 5 or 6.

この発明によれば、熱硬化性樹脂が含浸されたＦＲＰプリプレグが外周に装着されている芯棒を金属管の内部へ挿入し、前記ＦＲＰプリプレグが軟化するまで加熱して前記芯棒を膨張させ、前記ＦＲＰプリプレグの最外周を前記金属管の内周面に押し付け、更に加熱温度を上げて前記ＦＲＰプリプレグを硬化させ、前記ＦＲＰプリプレグの最外周を前記金属管の内周面に張り付けて一体化し、その後、常温まで冷却して前記芯棒を収縮させ、前記芯棒を前記金属管から抜き取る金属／ＦＲＰパイプの製造法において、かかる製造工程で常温に戻した際に前記の金属管からなる金属層に生じる引っ張りの熱残留応力が除去された金属／ＦＲＰパイプ及び、その製造方法、並びに、金属／ＦＲＰパイプの熱残留応力除去方法を提供することができる。 According to the present invention, a core rod having a FRP prepreg impregnated with a thermosetting resin is inserted into the inside of a metal tube and heated until the FRP prepreg is softened to expand the core rod. The outermost periphery of the FRP prepreg is pressed against the inner peripheral surface of the metal tube, the heating temperature is further increased to cure the FRP prepreg, and the outermost periphery of the FRP prepreg is attached to the inner peripheral surface of the metal tube to be integrated. Then, in the method of manufacturing a metal / FRP pipe in which the core rod is contracted by cooling to room temperature and the core rod is extracted from the metal tube, the metal comprising the metal tube when the temperature is returned to normal temperature in the manufacturing process. It is possible to provide a metal / FRP pipe from which tensile thermal residual stress generated in a layer is removed, a method for manufacturing the same, and a method for removing thermal residual stress from the metal / FRP pipe. .

本発明の金属／ＦＲＰパイプの一例を表す図。The figure showing an example of the metal / FRP pipe of this invention. （ａ）本発明の金属／ＦＲＰパイプの製造工程が開始される前の状態におけるマンドレルと金属管との位置関係を説明する一部を省略した縦断面図、（ｂ）図２（ａ）における一部を省略した横断面図。(A) Longitudinal sectional view omitting a part of the positional relationship between the mandrel and the metal tube in the state before the metal / FRP pipe manufacturing process of the present invention is started, (b) in FIG. 2 (a) The cross-sectional view which abbreviate | omitted one part. マンドレルにＣＦＲＰプリプレグが巻きつけられる状態を説明する斜視図。The perspective view explaining the state by which a CFRP prepreg is wound around a mandrel. 金属管に差し込まれるマンドレルの外周に巻きつけられているＣＦＲＰプリプレグを説明する一部を省略した斜視図。The perspective view which abbreviate | omitted one part explaining the CFRP prepreg currently wound around the outer periphery of the mandrel inserted in a metal tube. マンドレルの外周に巻きつけられているＣＦＲＰプリプレグに対して水分を付与し、熱溶融性のテープを巻きつける状態を説明する一部を省略した斜視図。The perspective view which abbreviate | omitted one part explaining the state which provides a water | moisture content with respect to the CFRP prepreg currently wound around the outer periphery of the mandrel, and winds a heat-meltable tape. 金属管の内部に、外周にＣＦＲＰプリプレグが巻きつけられているマンドレルが差し込まれ、貫通している状態を説明する一部を省略した斜視図。The perspective view which abbreviate | omitted one part explaining the state which the mandrel by which the CFRP prepreg is wound by the outer periphery is inserted in the inside of a metal tube, and has penetrated. （ａ）ＣＦＲＰプリプレグの両端木口面とマンドレルの表面との境界段差部にブリーダーテープを肉盛り状態に巻き付けた状態を説明する一部を省略した斜視図、（ｂ）図７（ａ）の全体図。(A) The perspective view which abbreviate | omitted one part explaining the state which wound the bleeder tape around the boundary level | step-difference part of the both-ends face of a CFRP prepreg, and the surface of a mandrel, (b) The whole of FIG. 7 (a) Figure. （ａ）加熱工程後、常温まで冷却した状態におけるマンドレルと、金属／ＦＲＰパイプとの位置関係を説明する一部を省略した縦断面図、（ｂ）図８（ａ）における一部を省略した横断面図。(A) Longitudinal sectional view omitting a part of the positional relationship between the mandrel and the metal / FRP pipe in a state cooled to room temperature after the heating step, (b) A part of FIG. 8 (a) is omitted. FIG. 加熱によりＦＲＰプリプレグの最外周が金属管の内周面に張り付けられて一体化する過程において、ＣＦＲＰプリプレグの外周に付与されていた水分から蒸発した気体が溶融状態のテープに封入されて発泡剤又はホットメルト接着剤のように挙動する状態を説明する拡大概念図。In the process in which the outermost periphery of the FRP prepreg is attached to the inner peripheral surface of the metal tube by heating and integrated, the gas evaporated from the moisture applied to the outer periphery of the CFRP prepreg is enclosed in a melted tape and the foaming agent or The expansion conceptual diagram explaining the state which behaves like a hot-melt-adhesive. 加熱工程後、常温まで冷却した状態でマンドレルを引き抜いた状態を示す正面図。The front view which shows the state which pulled out the mandrel in the state cooled to normal temperature after the heating process. 本発明による金属／ＦＲＰパイプの熱残留応力除去工程を説明する図。The figure explaining the thermal residual stress removal process of the metal / FRP pipe by this invention. 金属／ＦＲＰパイプの全体に対して所定のひずみ値になるまで引っ張り荷重を加える工程で使用されるチャックおよび、当該チャックを用いた軸方向への引き伸ばし工程を説明する側面図であって、チャックの開口部が金属／ＦＲＰパイプの端部開口に装着される前の状態を説明する側面図。It is a side view explaining the chuck | zipper used by the process of applying a tensile load until it becomes a predetermined | prescribed strain value with respect to the whole metal / FRP pipe, and the extending process to the axial direction using the said chuck | zipper, The side view explaining the state before an opening part is mounted | worn with the edge part opening of a metal / FRP pipe. 金属／ＦＲＰパイプの全体に対して所定のひずみ値になるまで引っ張り荷重を加える工程で使用されるチャックおよび、当該チャックを用いた軸方向への引き伸ばし工程を説明する側面図であって、引き延ばしが行われている状態を説明する側面図。FIG. 5 is a side view illustrating a chuck used in a process of applying a tensile load until a predetermined strain value is obtained with respect to the entire metal / FRP pipe, and an axial stretching process using the chuck; The side view explaining the state currently performed. （ａ）、（ｂ）は、内側挟持部の外周壁の周長が大きくなる方向及び小さくなる方向に内側挟持部が拡径、縮径する状態を説明する正面図であって、（ｂ）が（ａ）よりも拡径している状態を表す。(A), (b) is a front view explaining the state where the inner clamping part expands and contracts in the direction in which the peripheral length of the outer peripheral wall of the inner clamping part increases and decreases, (b) Represents a state in which the diameter is larger than (a). （ａ）、（ｂ）は、外側挟持部の外周壁の周長が小さくなる方向及び大きくなる方向に外側挟持部が縮径、拡径する状態を説明する正面図であって、（ｂ）が（ａ）よりも拡径している状態を表す。(A), (b) is a front view explaining the state where an outer side clamping part is diameter-reduced and diameter-expanded in the direction where the circumference of the outer peripheral wall of an outer side clamping part becomes small, and the direction which becomes large, (b) Represents a state in which the diameter is larger than (a).

以下、添付図面を参照して本発明の好ましい実施形態を説明する。 Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

（金属／ＦＲＰパイプの準備）
外径が６０．５ｍｍ、内径ｒ１が５７．５ｍｍ、厚みｗ１が１．５ｍｍの金属管２を準備した。金属管２は、線膨張係数が約２３．６×１０^−６／℃のアルミ合金（Ａ５０５２）製とした。 (Preparation of metal / FRP pipe)
A metal tube 2 having an outer diameter of 60.5 mm, an inner diameter r1 of 57.5 mm, and a thickness w1 of 1.5 mm was prepared. The metal tube 2 was made of an aluminum alloy (A5052) having a linear expansion coefficient of about 23.6 × 10 ⁻⁶ / ° C.

線膨張係数が約０．２〜０．４×１０^−６／℃のＣＦＲＰ（炭素繊維強化樹脂：ＰＡＮ系繊維Ｔ３００〜Ｔ８００、Ｖｆ：６０）からなるＵＤテープ材のクロス材に、あらかじめ熱硬化性樹脂（エポキシ樹脂）が含浸され、半硬化状態（プリプレグ）に形成されたＣＦＲＰプリプレグ３を準備した。ＣＦＲＰプリプレグ３の厚みｗ２は、金属管２の厚みｗ１の少なくとも約２．５倍に設定することが望ましく、ここでは、外径ｒ２が５７ｍｍ、内径が４５ｍｍ、厚みｗ２が６ｍｍのＣＦＲＰプリプレグ３を準備した。 Thermosetting in advance on a cloth material of UD tape material made of CFRP (carbon fiber reinforced resin: PAN fiber T300 to T800, Vf: 60) having a linear expansion coefficient of about 0.2 to 0.4 × 10 ⁻⁶ / ° C. CFRP prepreg 3 impregnated with a conductive resin (epoxy resin) and formed in a semi-cured state (prepreg) was prepared. The thickness w2 of the CFRP prepreg 3 is desirably set to at least about 2.5 times the thickness w1 of the metal tube 2. Here, the CFRP prepreg 3 having an outer diameter r2 of 57 mm, an inner diameter of 45 mm, and a thickness w2 of 6 mm is used. Got ready.

ＣＦＲＰプリプレグ３は、巻き付け芯となるマンドレル（金型）４に巻きつけられた状態で準備した。マンドレル４は、金属管２よりも大きく熱膨張できることが必要であり、ここでは金属管２と同材質のアルミ合金製の管で、その厚みｗ３が、金属管２の厚みｗ１の少なくとも約３倍に厚肉化されているアルミ合金管をマンドレル４とした。ここでは、外径ｒ３が４５ｍｍ、内径が３５ｍｍ、厚みｗ３が５ｍｍのものを用いた。 The CFRP prepreg 3 was prepared in a state where it was wound around a mandrel (mold) 4 serving as a winding core. The mandrel 4 needs to be able to expand more thermally than the metal tube 2. Here, the mandrel 4 is an aluminum alloy tube made of the same material as the metal tube 2, and its thickness w3 is at least about three times the thickness w1 of the metal tube 2. An aluminum alloy tube having a large thickness was used as a mandrel 4. Here, the outer diameter r3 is 45 mm, the inner diameter is 35 mm, and the thickness w3 is 5 mm.

巻き付け芯となるマンドレル（金型）４に巻きつけられた状態で準備されたＣＦＲＰプリプレグ３が、後述するように、加熱による軟化と、マンドレル４の膨張・収縮とを利用して、金属管２の内周に一体化して成形されるＦＲＰパイプ３ａとなる。 A CFRP prepreg 3 prepared in a state of being wound around a mandrel (die) 4 serving as a winding core uses a softening due to heating and expansion / contraction of the mandrel 4 as will be described later. The FRP pipe 3a is formed integrally with the inner periphery of the FRP pipe 3a.

この実施例では、マンドレル４の表面へあらかじめ耐熱用の離型剤（図示省略）を塗布して、マンドレル４を回転させ、その表面へＣＦＲＰプリプレグ３を図３のように巻き付けて一体化した。 In this example, a heat-resistant release agent (not shown) was applied to the surface of the mandrel 4 in advance, the mandrel 4 was rotated, and the CFRP prepreg 3 was wound around the surface and integrated as shown in FIG.

図３図示の実施形態では、ＣＦＲＰプリプレグ３のＵＤテープ材（繊維を一方向に引き揃えたプリプレグ）３１、３２、３３、３４をマンドレル４に対して、順次９０度の方向性に２プライ、０度の方向性に５〜７プライ、再び９０度の方向性に同じく２プライ、再び０度の方向性に同じく５〜７プライとして、図４に図示するように、交互の縦横積層状態に巻き付けた。 In the embodiment shown in FIG. 3, the UD tape material (prepreg in which fibers are aligned in one direction) 31, 32, 33, and 34 of CFRP prepreg 3 are arranged in two plies in a 90-degree direction with respect to mandrel 4, As shown in FIG. 4, 5-7 plies for the 0 degree orientation, 2 plies for the 90 degree orientation again, and 5-7 plies for the 0 degree orientation again, as shown in FIG. I wrapped it.

なお、巻き付けプライ数は製品の使用目的や用途などに応じて選定できるが、マンドレル４に巻きつけられた状態のＣＦＲＰプリプレグ３と、金属管２との内外相互間隙ｃ１が０．１〜０．３ｍｍになるように保つことが望ましい。０．３ｍｍよりも広いと、金属管２及びマンドレル４における熱膨張率との関係で、後述する張り付けライニング状態の耐久強度や安定性が低下するおそれがある。一方、０．１ｍｍよりも狭いと、ＣＦＲＰプリプレグ３が巻き付けられたマンドレル４を金属管２の内部へ円滑に差し込み貫通させることが難しくなる。 The number of winding plies can be selected according to the purpose and application of the product. However, the internal / external gap c1 between the CFRP prepreg 3 wound around the mandrel 4 and the metal tube 2 is 0.1-0. It is desirable to keep it at 3 mm. If it is wider than 0.3 mm, the durability and stability in the pasted lining state, which will be described later, may be reduced due to the relationship between the thermal expansion coefficients of the metal tube 2 and the mandrel 4. On the other hand, if it is narrower than 0.1 mm, it becomes difficult to smoothly insert and penetrate the mandrel 4 around which the CFRP prepreg 3 is wound into the metal tube 2.

この実施形態では、マンドレル４に巻き付けられたＣＦＲＰプリプレグ３の最外層３４へ霧吹きや湿した拭き布などによって水分５を付与した後、低密度ポリエチレン（ＬＤＰＥ）のフィルムからなる熱溶融性のテープ６を巻き付けた（図５）。図示の実施形態では、幅が２５ｍｍ、厚みが３０μｍの熱溶融性のテープ６を５プライ巻き付けで０．１５ｍｍの厚みに積層させた。 In this embodiment, after water 5 is applied to the outermost layer 34 of the CFRP prepreg 3 wound around the mandrel 4 by spraying or a wet wiping cloth, a heat-meltable tape 6 made of a film of low density polyethylene (LDPE). Was wound (FIG. 5). In the illustrated embodiment, a heat-meltable tape 6 having a width of 25 mm and a thickness of 30 μm is laminated to a thickness of 0.15 mm by winding 5 plies.

熱溶融性のテープ６は、後述する加熱工程においてＣＦＲＰプリプレグ３の熱硬化性樹脂（エポキシ樹脂）を溶融軟化させて流動性状にする際に、この加熱によって溶融し、同じく加熱によって前記水分５が蒸発して気体になり、この気体が封入された溶融状態で、発泡剤又はホットメルト接着剤のような役割を果たす目的で採用している。 The heat-meltable tape 6 is melted by this heating when the thermosetting resin (epoxy resin) of the CFRP prepreg 3 is melted and softened in a heating process to be described later. It is employed for the purpose of playing a role like a foaming agent or a hot-melt adhesive in a molten state in which this gas is evaporated and encapsulated.

こうして、ＣＦＲＰプリプレグ３の外周に水分５を介して熱溶融性のテープ６が巻き付けられたマンドレル４を、金属管２の内部へ差し込み貫通させる（図６）。図示の例ではアルミ合金からなる金属管２の内径ｒ１が５７．５ｍｍ、ＣＦＲＰプリプレグ３の外径ｒ２がテープ６を含んで５７．１５ｍｍであるため、これらが巻き付けられたマンドレル４を金属管２の内部へ支障なく差し込み貫通させることができた。 In this way, the mandrel 4 in which the heat-meltable tape 6 is wound around the outer periphery of the CFRP prepreg 3 through the moisture 5 is inserted and penetrated into the metal tube 2 (FIG. 6). In the illustrated example, since the inner diameter r1 of the metal tube 2 made of an aluminum alloy is 57.5 mm and the outer diameter r2 of the CFRP prepreg 3 is 57.15 mm including the tape 6, the mandrel 4 around which these are wound is used as the metal tube 2 It was possible to insert and penetrate through the inside of the machine.

図示の実施形態では、図６図示のように、金属管２の長さＬ１とＣＦＲＰプリプレグ３の長さＬ２との関係を、ＣＦＲＰプリプレグ３の両端部が金属管２の両端部から５〜１０ｍｍの長さＬ２ずつ突出するようにした。 In the illustrated embodiment, as shown in FIG. 6, the relationship between the length L1 of the metal tube 2 and the length L2 of the CFRP prepreg 3 is set such that both ends of the CFRP prepreg 3 are 5 to 10 mm from both ends of the metal tube 2. The length L2 of each was projected.

そして、図７図示のように、ＣＦＲＰプリプレグ３の両端がＬ３ずつ突出した状態で、ＣＦＲＰプリプレグ３の両端木口面と、マンドレル４の表面との境界段差部へ、耐熱性や離型性がある延伸ポリプロピレン（ＯＰＰ）のブリーダーテープ７を肉盛り状態に巻き付けた（図７）。こうして、後述する加熱時にＣＦＲＰプリプレグ３の熱硬化性樹脂が、その両端木口面から余分に溶け出さないように封止すると共に、長さＬ３ずつ突出しているＣＦＲＰプリプレグ３の最外層から空気が円滑に押し出される状態に保った。 Then, as shown in FIG. 7, with both ends of the CFRP prepreg 3 projecting by L3, the boundary step between the both ends of the CFRP prepreg 3 and the surface of the mandrel 4 has heat resistance and releasability. An expanded polypropylene (OPP) bleeder tape 7 was wound up in a piled state (FIG. 7). Thus, the thermosetting resin of the CFRP prepreg 3 is sealed so as not to be excessively melted from the both ends of the mouth at the time of heating, which will be described later, and the air smoothly flows from the outermost layer of the CFRP prepreg 3 protruding by the length L3. Kept extruded.

図７（ｂ）図示の状態で、全体を１３０℃〜１５０℃の温度を保つ加熱炉（図示省略）へ挿入し、３〜４時間加熱し、ＣＦＲＰプリプレグ３を完全に硬化させた。 In the state shown in FIG. 7B, the whole was inserted into a heating furnace (not shown) maintaining a temperature of 130 ° C. to 150 ° C. and heated for 3 to 4 hours to completely cure the CFRP prepreg 3.

この加熱工程において、マンドレル４に巻き付けられているＣＦＲＰプリプレグ３の熱硬化性樹脂（エポキシ樹脂）が、一旦溶融軟化して流動性状となる。そこで、当初曲げ応力を加えられていたＵＤテープ材３１、３２、３３、３４が自由になり、そのＵＤテープ材３１〜３４にはフラットな状態へ復元しようとする力が発生する。 In this heating step, the thermosetting resin (epoxy resin) of the CFRP prepreg 3 wound around the mandrel 4 is once melted and softened to become fluid. Therefore, the UD tape materials 31, 32, 33, and 34 to which bending stress is initially applied are freed, and a force for restoring the UD tape materials 31 to 34 to a flat state is generated.

また、マンドレル４と金属管２も加熱を受けて、各々図２（ｂ）の矢印で示す内外方向（求心方向と放射方向）へ膨張する。マンドレル４の厚みｗ３は金属管２の厚みｗ１に比して、少なくとも約３倍に設定されているため、金属管２よりも多量に熱膨張するマンドレル４の大きな勢力（内圧）を受けたＣＦＲＰプリプレグ３の最外層は、金属管２の内周面へ張り付き溶着一体化する。 The mandrel 4 and the metal tube 2 are also heated and expand in the inner and outer directions (centripetal direction and radial direction) indicated by arrows in FIG. Since the thickness w3 of the mandrel 4 is set to be at least about 3 times the thickness w1 of the metal tube 2, the CFRP that has received a large force (internal pressure) of the mandrel 4 that thermally expands more than the metal tube 2 The outermost layer of the prepreg 3 is attached to the inner peripheral surface of the metal tube 2 by welding and integrated.

こうして当初存在していたＣＦＲＰプリプレグ３と金属管２との内外相互間隙ｃ１（図２）が図８図示のようになくなる。 Thus, the internal / external gap c1 (FIG. 2) between the CFRP prepreg 3 and the metal tube 2 which originally existed is eliminated as shown in FIG.

ＣＦＲＰプリプレグ３の最外層に巻き付けられていた熱溶融性のテープ６は、この実施例では低密度ポリエチレンのフィルムからなり、約７０℃を越えると溶融する。また、テープ６の下地の水分５も加熱されて蒸発する。そこで、図９に拡大して示すように、溶融したテープ６ａに無数の気体が独立気泡として封じ込められ、その状態の下でマンドレル４からの多大な熱膨張力（内圧）を受ける。 The heat-meltable tape 6 wound around the outermost layer of the CFRP prepreg 3 is made of a low-density polyethylene film in this embodiment, and melts when the temperature exceeds about 70 ° C. Also, the moisture 5 underlying the tape 6 is heated and evaporated. Therefore, as shown in an enlarged view in FIG. 9, an infinite number of gases are contained as closed cells in the melted tape 6 a, and under that state, a great thermal expansion force (internal pressure) is received from the mandrel 4.

このように、水分５から蒸発した気体を封入した溶融状態のテープ６ａが、発泡剤又はホットメルト接着剤と化して、ＣＦＲＰプリプレグ３の溶けた熱硬化性樹脂（エポキシ樹脂）と一体の膜８になり、その能動的な働きによってＣＦＲＰプリプレグ３の最外層を金属管２へ内張り状態にライニングする。このように発泡剤又はホットメルト接着剤として能動的に働くテープ６は、ＣＦＲＰプリプレグ３と金属管２との内外相互間隙ｃ１から空気を押し出す役割を果たす。これによって、ＣＦＲＰプリプレグ３の最外層と金属管２の内周壁との間に層間剥離を生ずるおそれがなくなり、耐久強度に富む安定な焼きバメ状態を得られる。 In this way, the melted tape 6a in which the gas evaporated from the moisture 5 is sealed becomes a foaming agent or a hot-melt adhesive, and the film 8 integrated with the thermosetting resin (epoxy resin) in which the CFRP prepreg 3 is dissolved. Accordingly, the outermost layer of the CFRP prepreg 3 is lined on the metal tube 2 by its active action. Thus, the tape 6 actively acting as a foaming agent or a hot-melt adhesive serves to push air out from the inner and outer mutual gap c1 between the CFRP prepreg 3 and the metal tube 2. As a result, there is no risk of delamination between the outermost layer of the CFRP prepreg 3 and the inner peripheral wall of the metal tube 2, and a stable shrinkage state with high durability strength can be obtained.

ＣＦＲＰプリプレグ３の完全な硬化後、加熱炉から取り出して、常温まで冷却する。これにより、金属管２のみならず、マンドレル４も当初の太さまで収縮復元する。ここで、マンドレル４の厚みｗ３は金属管２の厚みｗ１に比し、少なくとも約３倍に設定されているため、その冷却時の復元収縮量も多い。また、アルミ合金からなる金属管２及びマンドレル４の線膨張係数：約２３．６×１０^−６／℃に対して、約０．２〜０．４×１０^−６／℃と線膨張係数が極めて小さいＣＦＲＰプリプレグ３は、実質的に膨張・収縮しない。そこで、この実施形態で挙げた前記の数値において、金属管２とＣＦＲＰプリプレグ３との間に当初存在していた０．２５ｍｍの間隙ｃ１が、前述したマンドレル４及び金属管２の熱膨張により埋め尽くされる。その一方、ＣＦＲＰプリプレグ３が硬化したＣＦＲＰ３ａとマンドレル４との間には、マンドレル４の収縮復元によって間隙ｃ２が形成される。 After the CFRP prepreg 3 is completely cured, the CFRP prepreg 3 is taken out from the heating furnace and cooled to room temperature. As a result, not only the metal tube 2 but also the mandrel 4 is restored to its original thickness. Here, since the thickness w3 of the mandrel 4 is set to be at least about three times as large as the thickness w1 of the metal tube 2, the amount of restoration shrinkage during cooling is also large. Further, the linear expansion coefficient of the metal tube 2 and the mandrel 4 made of an aluminum alloy is about 0.2 to 0.4 × 10 ⁻⁶ / ° C. with respect to about 23.6 × 10 ⁻⁶ / ° C. The extremely small CFRP prepreg 3 does not substantially expand or contract. Therefore, in the above-mentioned numerical values given in this embodiment, the 0.25 mm gap c1 that originally existed between the metal tube 2 and the CFRP prepreg 3 is filled by the thermal expansion of the mandrel 4 and the metal tube 2 described above. To be exhausted. On the other hand, a gap c <b> 2 is formed between the CFRP 3 a obtained by curing the CFRP prepreg 3 and the mandrel 4 by the contraction restoration of the mandrel 4.

この結果、金属管２へ内張りライニング状態に硬化したＣＦＲＰ３ａの内部からマンドレル４を支障なく円滑に抜き出すことができる。 As a result, the mandrel 4 can be smoothly extracted from the inside of the CFRP 3a cured in the lining state to the metal tube 2 without any trouble.

こうして、硬化したＣＦＲＰ３ａからマンドレル４を抜き出した後、金属管２とＣＦＲＰ３ａの両端部を図１０のように切除し、所定の長さＬの金属／ＦＲＰパイプ１（図１）を準備する。 Thus, after the mandrel 4 is extracted from the cured CFRP 3a, both ends of the metal tube 2 and the CFRP 3a are cut as shown in FIG. 10 to prepare the metal / FRP pipe 1 (FIG. 1) having a predetermined length L.

（熱残留応力の除去）
金属／ＦＲＰパイプ１の全体に対して、「アルミ合金（Ａ５０５２）の降伏ひずみ（ε^Ｙ _金属）＋アルミ合金（Ａ５０５２）の残留ひずみ（ε^Ｔ _金属）」のひずみ値になるまで引っ張り荷重を加え、次いで、除荷して金属／ＦＲＰパイプ１の熱残留応力を除去した。 (Removal of thermal residual stress)
A tensile load was applied to the entire metal / FRP pipe 1 until the strain value was "yield strain of aluminum alloy (A5052) (ε ^Y _metal ) + residual strain of aluminum alloy (A5052) (ε ^T _metal )". Subsequently, the metal / FRP pipe 1 was unloaded to remove the thermal residual stress.

こうして、本発明の金属／ＦＲＰパイプ１を製造した。 Thus, the metal / FRP pipe 1 of the present invention was manufactured.

ここで、金属／ＦＲＰパイプ１の全体に対して引っ張り荷重を加える工程は、金属／ＦＲＰパイプ１の両端の開口を、それぞれ、図１２、図１３図示のチャック１０で掴んで金属／ＦＲＰパイプ１を軸方向に引き伸ばすようにして行うことができる。 Here, the step of applying a tensile load to the entire metal / FRP pipe 1 is performed by holding the openings at both ends of the metal / FRP pipe 1 with the chucks 10 shown in FIGS. 12 and 13, respectively. Can be extended in the axial direction.

金属／ＦＲＰパイプ１の両端の開口にそれぞれ装着されるチャック１０は同一の構造、形状であるので、以下、図１２、図１３を参照して、金属／ＦＲＰパイプ１の左側端の開口に装着されるチャック１０について説明する。 Since the chucks 10 to be attached to the openings at both ends of the metal / FRP pipe 1 have the same structure and shape, they are attached to the opening at the left end of the metal / FRP pipe 1 with reference to FIGS. The chuck 10 to be used will be described.

チャック１０は、それぞれ、金属／ＦＲＰパイプ１の開口部が装入されるチャック開口部１８を備えている筒状である。図１２、図１３図示のように、中心部に内側押圧部１１を有し、内側押圧部１１を中心にして径方向外側に向かって、内側押圧部１１の外周側に内側挟持部１３、内側挟持部１３の外周側に外側挟持部１４、外側挟持部１４の外周側に外側押圧部１６が配備されている。 Each of the chucks 10 has a cylindrical shape including a chuck opening 18 into which the opening of the metal / FRP pipe 1 is inserted. As shown in FIGS. 12 and 13, the inner pressing portion 11 is provided at the center, and the inner clamping portion 13 is provided on the outer peripheral side of the inner pressing portion 11 toward the outer side in the radial direction centering on the inner pressing portion 11. An outer clamping part 14 is arranged on the outer circumferential side of the clamping part 13, and an outer pressing part 16 is arranged on the outer circumferential side of the outer clamping part 14.

内側押圧部１１は、図１２、図１３図示のように、チャック開口部１８側に向かうにつれて拡径し、中心軸が延びる方向において、チャック開口部１８側に向かう方向（矢印２０）に前進および、チャック開口部１８側から離れる方向（矢印２１）に後退可能になっている。 As shown in FIGS. 12 and 13, the inner pressing portion 11 increases in diameter toward the chuck opening 18, advances in the direction (arrow 20) toward the chuck opening 18 in the direction in which the central axis extends. Further, it can be retracted in the direction away from the chuck opening 18 side (arrow 21).

内側挟持部１３は、金属／ＦＲＰパイプ１の内周壁に対応する形状の外周壁を備えている。そして、図１４図示のように、外周壁の周長が大きくなる方向及び小さくなる方向に拡径（図１４（ａ）の矢印２６方向）及び縮径可能であり、軸方向に延びる分割溝１９ａ、１９ｂ、１９ｃによって、円周方向において所定の間隔をあけて複数の内側挟持片１３ａ、１３ｂ、１３ｃに分割されている。 The inner clamping portion 13 includes an outer peripheral wall having a shape corresponding to the inner peripheral wall of the metal / FRP pipe 1. As shown in FIG. 14, the dividing groove 19a can be increased in diameter (in the direction of arrow 26 in FIG. 14A) and reduced in the direction in which the peripheral length of the outer peripheral wall increases and decreases, and extends in the axial direction. , 19b, 19c are divided into a plurality of inner clamping pieces 13a, 13b, 13c at a predetermined interval in the circumferential direction.

外側挟持部１４は、図１２、図１３図示のように、内側挟持部１３との間に径方向に所定の間隔を有する隙間を介して配置され、金属／ＦＲＰパイプ１の外周壁に対応する形状の内周壁を備えている。そして、内周壁の周長が小さくなる方向及び大きくなる方向に縮径（図１５（ｂ）の矢印２７方向）及び拡径可能であり、軸方向に延びる分割溝１９ｄ、１９ｅ、１９ｆによって、円周方向において所定の間隔をあけて複数の外側挟持片１４ａ、１４ｂ、１４ｃに分割されている。更に、外側挟持片１４ａ等の内周壁には、掛止部１５（図１２、図１３）が配備されている。 As shown in FIGS. 12 and 13, the outer holding portion 14 is disposed through a gap having a predetermined interval in the radial direction between the inner holding portion 13 and corresponds to the outer peripheral wall of the metal / FRP pipe 1. It has an inner wall with a shape. And the diameter can be reduced (in the direction of arrow 27 in FIG. 15B) and the diameter can be increased in the direction in which the peripheral length of the inner peripheral wall decreases and increases, and the circular grooves are formed by dividing grooves 19d, 19e, 19f extending in the axial direction. It is divided into a plurality of outer pinching pieces 14a, 14b, 14c with a predetermined interval in the circumferential direction. Furthermore, the latching | locking part 15 (FIG. 12, FIG. 13) is arrange | positioned at inner peripheral walls, such as the outer side clamping piece 14a.

外側押圧部１６は、図１２、図１３図示のように、チャック開口部側１８に向かうにつれて縮径する内周壁を備えており、中心軸が延びる方向において、チャック開口部１８側に向かう方向（矢印２２方向）に前進および、チャック開口部１８側から離れる方向（矢印２３方向）に後退可能になっている。 As shown in FIGS. 12 and 13, the outer pressing portion 16 includes an inner peripheral wall that decreases in diameter toward the chuck opening 18, and in the direction in which the central axis extends, the direction toward the chuck opening 18 ( It can be moved forward (in the direction of arrow 22) and retracted in the direction away from the chuck opening 18 side (in the direction of arrow 23).

まず、図１２図示のように内側挟持部１３を矢印２０方向に前進させ、また、外側挟持部１４を矢印２２方向に前進させて、内側挟持部１３と外側挟持部１４との間に存在する径方向の隙間が、金属／ＦＲＰパイプ１の端部の開口部の周壁を収容するのに十分な状態にしておく。この状態では、内側挟持部１３は図１４（ａ）図示のように縮径している状態にあり、外側挟持部１４は図１５（ｂ）図示のように拡径している状態にある。 First, as shown in FIG. 12, the inner clamping part 13 is advanced in the direction of the arrow 20, and the outer clamping part 14 is advanced in the direction of the arrow 22, and exists between the inner clamping part 13 and the outer clamping part 14. The gap in the radial direction is in a state sufficient to accommodate the peripheral wall of the opening at the end of the metal / FRP pipe 1. In this state, the inner clamping part 13 is in a state of being reduced in diameter as shown in FIG. 14A, and the outer clamping part 14 is in a state of being expanded in diameter as shown in FIG. 15B.

次に、金属／ＦＲＰパイプ１の両端開口部の周壁が内側挟持部１３と外側挟持部１４との間に存在する径方向の隙間に挿入されるように金属／ＦＲＰパイプ１の左側の開口部にチャック１０の開口部１８を装着する（図１３）。図示していないが、金属／ＦＲＰパイプ１の右側の開口部にもチャック１０の開口部１８を装着する
ここで、例えば、ボルト１２を回転させることにより、内側押圧部１１を矢印２１方向に後退させる。これによって、内側挟持部１３の各内側挟持片１３ａ、１３ｂ、１３ｃの内周壁はテーパー状に傾斜している内側押圧部１１の外周壁に押されて矢印２６（図１４（ａ））で表すように拡径方向に移動する。これによって、内側挟持片１３ａ、１３ｂ、１３ｃの外周壁が金属／ＦＲＰパイプ１の内周壁、すなわち、ＣＦＲＰ３ａの内周壁に当接する。 Next, the opening on the left side of the metal / FRP pipe 1 is inserted so that the peripheral walls of the opening portions at both ends of the metal / FRP pipe 1 are inserted into a radial gap existing between the inner clamping portion 13 and the outer clamping portion 14. The opening 18 of the chuck 10 is attached to (Fig. 13). Although not shown, the opening 18 of the chuck 10 is also attached to the opening on the right side of the metal / FRP pipe 1. Here, for example, the inner pressing portion 11 is retracted in the direction of the arrow 21 by rotating the bolt 12. Let Thereby, the inner peripheral wall of each inner clamping piece 13a, 13b, 13c of the inner clamping part 13 is pushed by the outer peripheral wall of the inner pressing part 11 inclined in a taper shape, and is represented by an arrow 26 (FIG. 14 (a)). It moves in the diameter expansion direction. As a result, the outer peripheral walls of the inner clamping pieces 13a, 13b, 13c come into contact with the inner peripheral wall of the metal / FRP pipe 1, that is, the inner peripheral wall of the CFRP 3a.

一方、例えば、ボルト１７を回転させることにより、外側押圧部１６を矢印２３方向後退させる。これによって、外側挟持部１４の各外側挟持片１４ａ、１４ｂ、１４ｃの外周壁はテーパー状に傾斜している外側押圧部１６の内周壁に押されて矢印２７（図１５（ｂ））で表すように縮径方向に移動する。これによって、外側挟持片１４ａ、１４ｂ、１４ｃの内周壁に配備されている掛止部１５が金属／ＦＲＰパイプ１の外周壁、すなわち、アルミ合金からなる金属管２の外周壁に掛止される。 On the other hand, for example, by rotating the bolt 17, the outer pressing portion 16 is retracted in the direction of the arrow 23. As a result, the outer peripheral wall of each outer clamping piece 14a, 14b, 14c of the outer clamping part 14 is pushed by the inner peripheral wall of the outer pressing part 16 that is inclined in a tapered shape, and is represented by an arrow 27 (FIG. 15B). Move in the direction of diameter reduction. Thereby, the latching | locking part 15 arrange | positioned at the inner peripheral wall of the outer side clamping piece 14a, 14b, 14c is latched by the outer peripheral wall of the metal / FRP pipe 1, ie, the outer peripheral wall of the metal tube 2 which consists of aluminum alloys. .

この状態でチャック１０の全体を軸方向で外側に向かって矢印２５で示すように引き伸ばす。 In this state, the entire chuck 10 is stretched outward in the axial direction as indicated by an arrow 25.

このように引き伸ばしが行われる状態では、内側挟持部１３は図１４（ｂ）図示のように拡径している状態にあり、外側挟持部１４は図１５（ａ）図示のように縮径している状態にある。 In such a state where the stretching is performed, the inner clamping portion 13 is in a state of being expanded in diameter as shown in FIG. 14B, and the outer clamping portion 14 is reduced in diameter as shown in FIG. 15A. Is in a state.

以上のように、金属／ＦＲＰパイプ１の両端の開口を、それぞれ、チャック１０で掴んで金属／ＦＲＰパイプ１を軸方向に引き伸ばすことによって金属／ＦＲＰパイプ１の全体に対して引っ張り荷重を加える際、金属／ＦＲＰパイプ１の内周壁、すなわち、ＣＦＲＰ３ａの内周壁には内側挟持片１３ａ、１３ｂ、１３ｃの外周壁が当接し、金属／ＦＲＰパイプ１の外周壁、すなわち、アルミ合金からなる金属管２の外周壁に掛止する外側挟持片１４ａ、１４ｂ、１４ｃの内周壁に配備されている掛止部１５と協働して金属／ＦＲＰパイプ１の開口の周壁が挟持され、引張りが行われる。そこで、ＣＦＲＰ３ａの内周壁に破壊が生じることなく、希望する引っ張り強度で引き伸ばしを行うことができる。 As described above, when a tensile load is applied to the entire metal / FRP pipe 1 by gripping the openings at both ends of the metal / FRP pipe 1 with the chuck 10 and extending the metal / FRP pipe 1 in the axial direction, respectively. The outer peripheral wall of the inner clamping pieces 13a, 13b, 13c is in contact with the inner peripheral wall of the metal / FRP pipe 1, that is, the inner peripheral wall of the CFRP 3a, and the outer peripheral wall of the metal / FRP pipe 1, that is, a metal tube made of an aluminum alloy. The peripheral wall of the opening of the metal / FRP pipe 1 is clamped in cooperation with the latching portion 15 arranged on the inner peripheral wall of the outer clamping pieces 14a, 14b, 14c that are latched on the outer peripheral wall of the metal 2 and is pulled. . Therefore, the CFRP 3a can be stretched with a desired tensile strength without causing damage to the inner peripheral wall.

なお、外側挟持片１４ａ、等の内周壁に配備されている掛止部１５は、前述したように、外側挟持部１４の各外側挟持片１４ａ、等が縮径方向に移動した際に、外側挟持片１４ａ、等の内周壁に配備されている掛止部１５が金属／ＦＲＰパイプ１の外周壁に掛止し、この状態でチャック１０の全体が軸方向で外側に向かって矢印２５で示すように移動することにより、金属／ＦＲＰパイプ１の全体を軸方向に引き伸ばすことを可能にするものであれば、種々の形状、構造のものにすることができる。 Note that, as described above, the latching portion 15 provided on the inner peripheral wall of the outer clamping piece 14a, etc., when the outer clamping pieces 14a, etc. of the outer clamping portion 14 move in the diameter reducing direction, A latching portion 15 provided on the inner peripheral wall of the sandwiching piece 14a or the like is latched on the outer peripheral wall of the metal / FRP pipe 1, and in this state, the entire chuck 10 is indicated by an arrow 25 outward in the axial direction. As long as the entire metal / FRP pipe 1 can be extended in the axial direction by moving in this manner, it can have various shapes and structures.

また、チャック１０の構造も、金属／ＦＲＰパイプ１の内径側から金属／ＦＲＰパイプ１の内周壁に当接する部材と、金属／ＦＲＰパイプ１の外径側から金属／ＦＲＰパイプ１の外周壁に当接する部材とによって、金属／ＦＲＰパイプ１の端部開口の周壁を挟持し、金属／ＦＲＰパイプ１の内周壁、すなわちＣＦＲＰ３ａの内周壁に破壊を生じさせることなく、希望する引っ張り強度で引き伸ばしを行うことができるものであれば、図示し、上述した構造に限られるものではない。 The structure of the chuck 10 also includes a member that contacts the inner peripheral wall of the metal / FRP pipe 1 from the inner diameter side of the metal / FRP pipe 1, and an outer peripheral wall of the metal / FRP pipe 1 from the outer diameter side of the metal / FRP pipe 1. The peripheral wall of the end opening of the metal / FRP pipe 1 is sandwiched between the abutting member and the inner peripheral wall of the metal / FRP pipe 1, that is, the inner peripheral wall of the CFRP 3a is stretched at a desired tensile strength without causing damage. If it can be performed, it is not limited to the structure shown and described above.

（熱残留応力除去試験）
前記のようにして金属／ＦＲＰパイプの熱残留応力を除去できることは以下の実験によって確認できる。 (Thermal residual stress removal test)
It can be confirmed by the following experiment that the thermal residual stress of the metal / FRP pipe can be removed as described above.

金属管２への内張りライニング状態に硬化したＣＦＲＰ３ａは十分剛性が高く、熱ひずみもゼロに近いとしてＣＦＲＰ３ａの残留応力（及び残留ひずみ：ε^Ｔ _ＣＦ）を無視する。なお、図１１においてＣＦＲＰ３ａの層を「ＣＦ層」と表している。 The CFRP 3a cured to the lining state on the metal tube 2 is sufficiently rigid and the thermal strain is close to zero, and the residual stress (and residual strain: ε ^T _CF ) of the CFRP 3a is ignored. In FIG. 11, the layer of CFRP 3 a is represented as “CF layer”.

一方、アルミ合金からなる金属管２には前記のように高温にし、常温に戻した際に、引っ張りの残留熱応力（σ^Ｔ _ＡＬ）が生じている。 On the other hand, a tensile residual thermal stress (σ ^T _AL ) is generated in the metal tube 2 made of an aluminum alloy when the temperature is raised to room temperature as described above.

そこで、金属管２のアルミ合金層（図１１において「ＡＬ層」と表している）の熱残留応力（σ^Ｔ _ＡＬ）を打ち消すように、金属／ＦＲＰパイプ１の全体に引っ張り荷重を加える試験である。 Therefore, in a test in which a tensile load is applied to the entire metal / FRP pipe 1 so as to cancel out the thermal residual stress (σ ^T _AL ) of the aluminum alloy layer (shown as “AL layer” in FIG. 11) of the metal tube 2. is there.

引張試験前後及び試験中の状態を、図１１にあるように、（１）硬化後の常温での状態、（２）引張試験で目標まで引張った状態、（３）引張試験後、残留応力がなくなった状態として、ＣＦ層、ＡＬ層の応力ひずみ関係を表すと図１１にグラフで示した状態になる。 As shown in FIG. 11, the state before and after the tensile test and during the test are as follows: (1) the state at room temperature after curing, (2) the state pulled to the target in the tensile test, and (3) the residual stress after the tensile test. When the stress-strain relationship between the CF layer and the AL layer is expressed as a state of disappearance, the state illustrated in FIG. 11 is obtained.

すなわち、「アルミ合金（Ａ５０５２）の降伏ひずみ(εＹＡＬ)」のひずみ値になるまで引張荷重を加え、次いで、除荷すると、ＡＬ層の熱残留応力がゼロになる。 That is, when a tensile load is applied until the strain value of “yield strain (εYAL) of aluminum alloy (A5052)” is reached and then unloaded, the thermal residual stress of the AL layer becomes zero.

なお、引張荷重で目標を設定する場合には、図１１に表されているように下記の式１に基づいて目標の引張荷重を設定することができる。 In addition, when setting a target with a tensile load, the target tensile load can be set based on the following formula 1 as shown in FIG.

（式１）
引張荷重Ｆ＝σ^Ｙ _ＡＬ／Ｅ_ＡＬ×（Ｅ_ＣＦＡ_ＣＦ＋Ｅ_ＡＬＡ_ＡＬ）
ここで、σ^Ｙ _ＡＬ：ＡＬ層の降伏応力
Ｅ_ＡＬ：ＡＬ層のヤング率、Ｅ_ＣＦ：ＣＦ層のヤング率
Ａ_ＡＬ：ＡＬ層の断面積、Ａ_ＣＦ：ＣＦ層の断面積 (Formula 1)
Tensile load ^{_{_{F = σ Y AL / E AL}}} × (E CF A CF + E AL A AL)
Where σ ^Y _AL : Yield stress of AL layer
E _AL: Young's modulus of the AL _{layer, E} CF: Young's modulus of the CF layer
A _AL : Cross section of AL layer, A _CF : Cross section of CF layer

以上、添付図面を参照して本発明の好ましい実施形態を説明したが、本発明はかかる実施形態に限られるものではなく、特許請求の範囲の記載から把握される技術的範囲において種々の形態に変更可能である。 As mentioned above, although preferred embodiment of this invention was described with reference to the accompanying drawing, this invention is not limited to this embodiment, In various forms in the technical range grasped | ascertained from description of a claim It can be changed.

例えば、本発明は、芯棒の外周に装着されているＦＲＰプリプレグの加熱による軟化と、芯棒の膨張・収縮とを利用し、熱硬化性樹脂が含浸されたＦＲＰプリプレグが外周に装着されている芯棒が内部に挿入された金属管と、その内周に成形されるＦＲＰパイプとを加熱成形時に一体化した金属／ＦＲＰパイプにおいて、加熱成形時に金属管と、前記ＦＲＰプリプレグが硬化して金属管の内周に成形されるＦＲＰパイプとが一体化することから引き起こされる、常温に戻した際に金属管に生じる引っ張りの熱残留応力による問題の解決を目指すものである。そこで、金属／ＦＲＰパイプを準備する工程は前述したものに限られない。 For example, the present invention utilizes the softening of the FRP prepreg attached to the outer periphery of the core rod by heating and the expansion / contraction of the core rod, and the FRP prepreg impregnated with a thermosetting resin is attached to the outer periphery. In a metal / FRP pipe in which a metal tube having a core rod inserted therein and an FRP pipe formed on the inner periphery thereof are integrated at the time of heat forming, the metal tube and the FRP prepreg are cured at the time of heat forming. The object is to solve the problem caused by the thermal residual stress of the tensile force generated in the metal tube when it is returned to room temperature, which is caused by the integration of the FRP pipe formed on the inner periphery of the metal tube. Therefore, the process of preparing the metal / FRP pipe is not limited to the above-described process.

熱硬化性樹脂が含浸されたＦＲＰプリプレグが外周に装着されている芯棒を金属管の内部へ挿入し、前記ＦＲＰプリプレグが軟化するまで加熱して前記芯棒を膨張させ、前記ＦＲＰプリプレグの最外周を前記金属管の内周面に押し付け、更に加熱温度を上げて前記ＦＲＰプリプレグを硬化させ、前記ＦＲＰプリプレグの最外周を前記金属管の内周面に張り付けて一体化し、その後、常温まで冷却して前記芯棒を収縮させ、前記芯棒を前記金属管から抜き取ることにより金属／ＦＲＰパイプが準備されるのであれば、種々の方法・工程を採用可能であり、金属管、マンドレル、等のサイズや、金属管、マンドレル、ＦＲＰプリプレグ、熱硬化性樹脂、等の材質も種々に変更可能である。 A core rod with an FRP prepreg impregnated with a thermosetting resin is inserted into the metal tube and heated until the FRP prepreg is softened to expand the core rod. The outer periphery is pressed against the inner peripheral surface of the metal tube, the heating temperature is further raised to cure the FRP prepreg, the outermost periphery of the FRP prepreg is attached to the inner peripheral surface of the metal tube, and then cooled to room temperature. If the metal / FRP pipe is prepared by contracting the core rod and extracting the core rod from the metal tube, various methods and processes can be adopted, such as a metal tube, a mandrel, etc. The material such as size, metal tube, mandrel, FRP prepreg, thermosetting resin, etc. can be variously changed.

また、金属／ＦＲＰパイプにおける金属管、ＦＲＰ管の材質も前述したものに限られない。 Further, the material of the metal pipe and the FRP pipe in the metal / FRP pipe is not limited to that described above.

１金属／ＦＲＰパイプ
２金属管
３ＣＦＲＰプリプレグ
４マンドレル
ｃ１ＣＦＲＰプリプレグと金属管との内外相互間隙
ｃ２硬化したＣＦＲＰとマンドレルとの内外相互間隙
１０チャック
１１内側押圧部
１３内側挟持部
１３ａ、１３ｂ、１３ｃ内側挟持片
１４外側挟持部
１４ａ、１４ｂ、１４ｃ外側挟持片
１５掛止部
１６外側押圧部
１８チャック開口部
１９ａ、１９ｂ、１９ｃ、１９ｄ、１９ｅ、１９ｆ軸方向に延びる分割溝 DESCRIPTION OF SYMBOLS 1 Metal / FRP pipe 2 Metal pipe 3 CFRP prepreg 4 Mandrel c1 Inner / outer mutual gap c2 between CFRP prepreg and metal tube Inner / outer mutual gap between hardened CFRP and mandrel 10 Chuck 11 Inner pressing part 13 Inner clamping parts 13a, 13b, 13c Inner pinching piece 14 Outer pinching portions 14a, 14b, 14c Outer pinching piece 15 Latching portion 16 Outer pressing portion 18 Chuck opening portions 19a, 19b, 19c, 19d, 19e, 19f Dividing grooves extending in the axial direction

Claims

Insert a core rod with FRP prepreg impregnated with thermosetting resin on the outer periphery into the inside of the metal tube,
Heating until the FRP prepreg is softened to expand the core rod, pressing the outermost periphery of the FRP prepreg against the inner peripheral surface of the metal tube,
Further, the heating temperature is raised to cure the FRP prepreg, and the outermost periphery of the FRP prepreg is attached to the inner peripheral surface of the metal tube to be integrated,
Thereafter, the core rod is contracted by cooling to room temperature, and a tensile load is applied to the entire metal / FRP pipe with the core rod extracted from the metal tube until a predetermined strain value is obtained. To produce a metal / FRP pipe.

The process of applying a tensile load until the predetermined strain value is obtained for the entire metal / FRP pipe with the core rod extracted from the metal pipe,
The opening of both ends of the metal / FRP pipe is gripped by chucks, and the metal / FRP pipe is stretched in the axial direction.
Each of the chucks has a cylindrical shape having a chuck opening into which the opening of the metal / FRP pipe is inserted, has an inner pressing portion at the center, and is radially oriented around the inner pressing portion. Toward the outside, the inner pressing part on the outer peripheral side of the inner pressing part, the outer clamping part on the outer peripheral side of the inner clamping part, and the outer pressing part on the outer peripheral side of the outer clamping part,
The inner pressing portion increases in diameter toward the chuck opening side, and can advance in the direction toward the chuck opening side and retreat in the direction away from the chuck opening side in the direction in which the central axis extends.
The inner clamping portion includes an outer peripheral wall having a shape corresponding to the inner peripheral wall of the metal / FRP pipe, and can be expanded and contracted in a direction in which the peripheral length of the outer peripheral wall increases and decreases. The axially divided grooves are divided into a plurality of inner clamping pieces at predetermined intervals in the circumferential direction,
The outer holding portion is disposed through a gap having a predetermined gap in the radial direction between the outer holding portion and an inner peripheral wall having a shape corresponding to the outer peripheral wall of the metal / FRP pipe. The peripheral wall can be reduced in diameter and increased in the direction in which the peripheral length becomes smaller and larger, and is divided into a plurality of outer clamping pieces at predetermined intervals in the circumferential direction by dividing grooves extending in the axial direction. And has a latching portion on the inner peripheral wall of the outer clamping piece,
The outer pressing portion includes an inner peripheral wall that decreases in diameter toward the chuck opening, moves forward in the direction toward the chuck opening, and moves away from the chuck opening in the direction in which the central axis extends. Reversible in the direction,
The chucks are respectively provided at both end openings of the metal / FRP pipe so that peripheral walls of both end openings of the metal / FRP pipe are inserted into radial gaps existing between the inner sandwiching portion and the outer sandwiching portion. After installing the opening,
Retreating the inner pressing part to move each inner clamping piece of the inner clamping part in the diameter increasing direction to bring the outer peripheral wall of the inner clamping piece into contact with the inner peripheral wall of the metal / FRP pipe;
By retracting the outer pressing portion, each outer clamping piece of the outer clamping portion is moved in the diameter reducing direction so that a latching portion provided on the inner peripheral wall of the outer clamping piece is provided on the outer peripheral wall of the metal / FRP pipe. 2. The metal / FRP pipe is stretched in the axial direction by pulling the outer peripheral wall of the metal / FRP pipe outward in the axial direction while being latched. Method for manufacturing metal / FRP pipes.

The predetermined strain value is “yield strain of the metal layer composed of the metal tube (ε ^Y _metal ) + residual strain of the metal layer composed of the metal tube (ε ^T _metal )” A method for producing a metal / FRP pipe according to claim 1 or 2.

A metal / FRP pipe manufactured by the method for manufacturing a metal / FRP pipe according to any one of claims 1 to 3.

Insert a core rod with FRP prepreg impregnated with thermosetting resin on the outer periphery into the inside of the metal tube,
Heating until the FRP prepreg is softened to expand the core rod, pressing the outermost periphery of the FRP prepreg against the inner peripheral surface of the metal tube,
Further, the heating temperature is raised to cure the FRP prepreg, and the outermost periphery of the FRP prepreg is attached to the inner peripheral surface of the metal tube to be integrated,
Thereafter, the core rod is contracted by cooling to room temperature, and the residual stress of the metal layer composed of the metal tube of the metal / FRP pipe manufactured by extracting the core rod from the metal tube is removed. ,
A method of removing thermal residual stress from a metal / FRP pipe, wherein a tensile load is applied to the entire metal / FRP pipe until a predetermined strain value is reached, and then the load is unloaded.

The step of applying a tensile load until a predetermined strain value is obtained with respect to the entire metal / FRP pipe,
The opening of both ends of the metal / FRP pipe is gripped by chucks, and the metal / FRP pipe is stretched in the axial direction.
Each of the chucks has a cylindrical shape having a chuck opening into which the opening of the metal / FRP pipe is inserted, has an inner pressing portion at the center, and is radially oriented around the inner pressing portion. Toward the outside, the inner pressing part on the outer peripheral side of the inner pressing part, the outer clamping part on the outer peripheral side of the inner clamping part, and the outer pressing part on the outer peripheral side of the outer clamping part,
The inner pressing portion increases in diameter toward the chuck opening side, and can advance in the direction toward the chuck opening side and retreat in the direction away from the chuck opening side in the direction in which the central axis extends.
The inner clamping portion includes an outer peripheral wall having a shape corresponding to the inner peripheral wall of the metal / FRP pipe, and can be expanded and contracted in a direction in which the peripheral length of the outer peripheral wall increases and decreases. The axially divided grooves are divided into a plurality of inner clamping pieces at predetermined intervals in the circumferential direction,
The outer holding portion is disposed through a gap having a predetermined gap in the radial direction between the outer holding portion and an inner peripheral wall having a shape corresponding to the outer peripheral wall of the metal / FRP pipe. The peripheral wall can be reduced in diameter and increased in the direction in which the peripheral length becomes smaller and larger, and is divided into a plurality of outer clamping pieces at predetermined intervals in the circumferential direction by dividing grooves extending in the axial direction. And has a latching portion on the inner peripheral wall of the outer clamping piece,
The outer pressing portion includes an inner peripheral wall that decreases in diameter toward the chuck opening, moves forward in the direction toward the chuck opening, and moves away from the chuck opening in the direction in which the central axis extends. Reversible in the direction,
The chucks are respectively provided at both end openings of the metal / FRP pipe so that peripheral walls of both end openings of the metal / FRP pipe are inserted into radial gaps existing between the inner sandwiching portion and the outer sandwiching portion. After installing the opening,
Retreating the inner pressing part to move each inner clamping piece of the inner clamping part in the diameter increasing direction to bring the outer peripheral wall of the inner clamping piece into contact with the inner peripheral wall of the metal / FRP pipe;
By retracting the outer pressing portion, each outer clamping piece of the outer clamping portion is moved in the diameter reducing direction so that a latching portion provided on the inner peripheral wall of the outer clamping piece is provided on the outer peripheral wall of the metal / FRP pipe. 6. The metal / FRP pipe is pulled so as to extend in the axial direction by extending the outer peripheral wall of the metal / FRP pipe in the axial direction outward while being hooked. For removing residual thermal stress from metal / FRP pipes.

The predetermined strain value is “yield strain of the metal layer composed of the metal tube (ε ^Y _metal ) + residual strain of the metal layer composed of the metal tube (ε ^T _metal )” The method for removing thermal residual stress from a metal / FRP pipe according to claim 5 or 6.