JP7287000B2 - Hose fitting manufacturing method - Google Patents

Hose fitting manufacturing method Download PDF

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JP7287000B2
JP7287000B2 JP2019032953A JP2019032953A JP7287000B2 JP 7287000 B2 JP7287000 B2 JP 7287000B2 JP 2019032953 A JP2019032953 A JP 2019032953A JP 2019032953 A JP2019032953 A JP 2019032953A JP 7287000 B2 JP7287000 B2 JP 7287000B2
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joint
fitting
hose fitting
hose
pipe member
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JP2020138202A (en
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博 奥村
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Yokohama Rubber Co Ltd
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Description

本発明は、ホース金具の製造方法に関し、さらに詳しくは、部材どうしを摩擦圧接接合した後に曲げ加工、メッキ加工をして製造されたホース金具の接合部での割れ発生を抑制できるホース金具の製造方法に関するものである。 TECHNICAL FIELD The present invention relates to a method for manufacturing a hose fitting, and more particularly, to manufacture a hose fitting capable of suppressing the occurrence of cracks at the joint portion of the hose fitting manufactured by bending and plating after joining members together by friction welding. It is about the method.

ゴムホース等に接続されるホース金具を製造する方法として、パイプ部材の端部どうしを突き合わせて互いを軸方向に圧接しつつ高速で相対回転させて摩擦溶接する方法が知られている(例えば、特許文献１参照)。ベンド部を有するホース金具を製造する際には、例えば、このようにパイプ部材どうしを摩擦圧接接合して一体化させた一体物を、所定形状に曲げ加工した後にメッキ加工を行う。 As a method for manufacturing hose fittings to be connected to rubber hoses, etc., there is known a friction welding method in which the ends of pipe members are butted against each other and pressed against each other in the axial direction while being relatively rotated at high speed (for example, patent Reference 1). When manufacturing a hose fitting having a bent portion, for example, an integrated product obtained by joining pipe members together by friction welding is bent into a predetermined shape and then plated.

このように製造されたベンド部を有するホース金具では、部材どうしを圧接させた接合部に割れが発生することがある。特に、接合部の曲げ外周側の表面に割れが発生し易い。それ故、部材どうしを摩擦圧接接合した後に曲げ加工をして製造されたホース金具では、接合部での割れ発生を抑制するには改善の余地がある。 In a hose fitting having a bent portion manufactured in this manner, cracks may occur at joints where the members are brought into pressure contact with each other. In particular, cracks are likely to occur on the surface of the joint portion on the bending outer peripheral side. Therefore, there is room for improvement in suppressing the occurrence of cracks at joints in hose fittings manufactured by bending after joining members by friction welding.

特開平１０－２６３８５１号公報JP-A-10-263851

本発明の目的は、部材どうしを摩擦圧接接合した後に曲げ加工、メッキ加工をして製造されたホース金具の接合部での割れ発生を抑制できるホース金具の製造方法を提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a hose fitting capable of suppressing the occurrence of cracks at the joint portion of the hose fitting manufactured by bending and plating after joining members together by friction welding.

上記目的を達成するため本発明のホース金具の製造方法は、金属製の直線状パイプ部材と所定形状の筒状金具部材とを、互いの対向する端面どうしを摩擦圧接接合することにより一体化させた一体物を製造し、この一体物の前記パイプ部材に相当する範囲を所定形状に曲げ加工し、且つ、メッキ加工をすることより、ベンド部を有し、使用内圧が３５ＭＰａ以上のホース金具を製造するホース金具の製造方法において、前記摩擦圧接接合の条件を調整することにより、前記曲げ加工後の前記メッキ加工の前に前記ホース金具の前記パイプ部材と前記筒状金具部材の接合部のビッカース硬度ＨＶの上昇を抑えて前記接合部のビッカース硬度ＨＶを１１７以上３４４以下にし、前記接合部は前記パイプ材と前記金具部材の接合面から前記金具部材側および前記パイプ材側にそれぞれ、前記金具部材の筒軸方向に０．５ｍｍまでの範囲であり、前記曲げ加工の曲げ中心と前記接合面との前記筒軸方向の距離が１０ｍｍ以下であることを特徴とする。 In order to achieve the above object, the method for manufacturing a hose fitting according to the present invention integrates a metal linear pipe member and a cylindrical fitting member having a predetermined shape by friction welding the opposing end surfaces thereof. A hose fitting having a bent portion and a working internal pressure of 35 MPa or more is manufactured by manufacturing an integrated body, bending the range corresponding to the pipe member of this integrated body into a predetermined shape, and plating it. In the manufacturing method of the hose fitting to be manufactured, by adjusting the friction welding conditions, the Vickers of the joint between the pipe member and the cylindrical fitting member of the hose fitting is adjusted before the plating process after the bending process. The Vickers hardness HV of the joint portion is set to 117 or more and 344 or less by suppressing an increase in the hardness HV, and the joint portion is arranged on the metal member side and the pipe material side from the joint surface of the pipe member and the metal member member, respectively. The range is up to 0.5 mm in the cylinder axis direction of the fitting member, and the distance between the bending center of the bending process and the joint surface in the cylinder axis direction is 10 mm or less.

本発明によれば、前記パイプ部材と所定形状の筒状金具部材とを摩擦圧接接合することで、これら部材が焼き入れされて硬度が向上するが、前記曲げ加工後の前記メッキ加工前の前記ホース金具の前記パイプ部材と前記筒状金具部材の接合部のビッカース硬度ＨＶを３４４以下に抑えることで接合部に割れが発生し難くなる。また、この接合部のビッカース硬度ＨＶを１７７以上にすることで、ホース金具の実用に耐え得る耐圧性、耐久性を確保できる。 According to the present invention, by joining the pipe member and the tubular fitting member having a predetermined shape by friction welding, these members are quenched and the hardness is improved. By suppressing the Vickers hardness HV of the joint between the pipe member and the tubular metal member of the hose fitting to 344 or less, cracks are less likely to occur in the joint. Further, by setting the Vickers hardness HV of the joint portion to 177 or more, pressure resistance and durability that can withstand practical use of the hose fitting can be ensured.

本発明により製造されたホース金具を側面視で例示する説明図である。BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which illustrates the hose metal fitting manufactured by this invention by side view. 図１のＡ－Ａ断面図である。FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1; ホース金具の接合部の範囲を縦断面視で例示する説明図である。It is explanatory drawing which illustrates the range of the joint part of a hose metal fitting by a longitudinal cross-sectional view. 図１のホース金具を製造する際に使用される部材を側面視で例示する説明図である。1. It is explanatory drawing which illustrates the member used when manufacturing the hose metal fitting of FIG. 1 by the side view. 図４の部材どうしを摩擦圧接接合する工程を縦断面視で例示する説明図である。FIG. 5 is an explanatory diagram illustrating a process of joining the members of FIG. 4 by friction welding in a vertical cross-sectional view; 図５の工程に製造された一体物に生じたバリを除去する工程を縦断面視で例示する説明図である。FIG. 6 is an explanatory view illustrating, in a vertical cross-sectional view, a step of removing burrs generated in the integrated product manufactured in the step of FIG. 5 ; 図６の工程を経た一体物を所定形状に曲げる曲げ工程を縦断面視で例示する説明図である。FIG. 7 is an explanatory view illustrating a bending process of bending the integral body that has undergone the process of FIG. 6 into a predetermined shape in a vertical cross-sectional view; 図７の工程を経た一体物をメッキ処理するメッキ工程を例示する説明図である。FIG. 8 is an explanatory diagram illustrating a plating process for plating the integral body that has undergone the process of FIG. 7; ホース金具に発生した割れを縦断面視で例示する説明図である。It is explanatory drawing which illustrates the crack which generate|occur|produced in the hose metal fitting by the longitudinal cross-sectional view.

以下、本発明のホース金具の製造方法を、図に示した実施形態に基づいて説明する。 Hereinafter, a method for manufacturing a hose fitting according to the present invention will be described based on an embodiment shown in the drawings.

本発明を用いて図１、図２に例示するホース金具１が製造される。このホース金具１は、ベンド部４ａを有していて、所定形状の筒状金具部材３と金属製の直線状のパイプ部材４とを用いて製造されている。図１ではベンド部４ａの曲げ角度は９０°になっているが、この角度に限定されることはなく例えば４５°以上９０°以下の所望の曲げ角度に設定される。 A hose fitting 1 illustrated in FIGS. 1 and 2 is manufactured using the present invention. This hose fitting 1 has a bend portion 4a and is manufactured using a tubular fitting member 3 having a predetermined shape and a straight pipe member 4 made of metal. Although the bending angle of the bend portion 4a is 90° in FIG. 1, it is not limited to this angle and is set to a desired bending angle of, for example, 45° or more and 90° or less.

筒状金具部材３は大径の筒状体と小径の筒状体とが連続した形状になっていて、大径の筒状体がフランジになっている。この小径の筒状体はパイプ部材４の一端と接合されている。筒状金具部材３とパイプ部材４の接合面２ａは図中では細線の破線で示されている。パイプ部材４の他端部にはゴム等で形成されたホース６が接続される。 The tubular fitting member 3 has a shape in which a large-diameter tubular body and a small-diameter tubular body are continuous, and the large-diameter tubular body serves as a flange. This small-diameter tubular body is joined to one end of the pipe member 4 . The joint surface 2a between the tubular metal fitting member 3 and the pipe member 4 is indicated by a thin broken line in the drawing. A hose 6 made of rubber or the like is connected to the other end of the pipe member 4 .

筒状金具部材３とパイプ部材４とは同じ材質の場合も、異なる材質の場合もある。この実施形態では、筒状金具部材３（Ｓ３５Ｃ）がパイプ部材４（Ｓ２０Ｃ）よりも硬度が高い材質になっている。筒状金具部材３、パイプ部材４の材質としては、Ｓ１０Ｃ、Ｓ１２Ｃ、Ｓ１５Ｃ、Ｓ１７Ｃ、Ｓ２０Ｃ、Ｓ２２Ｃ、Ｓ２５Ｃ、Ｓ２８Ｃ、Ｓ３０Ｃ、Ｓ３３Ｃ、Ｓ３５Ｃ、Ｓ３８Ｃ、Ｓ４０Ｃ、Ｓ４３Ｃ、Ｓ４５Ｃ、ＳＴＫＭ１１Ａ、ＳＴＫＭ１２Ａ、ＳＴＫＭ１３Ａ等の機械構造用炭素鋼を例示できる。その他に、ホース金具１に対する要求性能を満たす炭素鋼などを用いることができる。 The tubular fitting member 3 and the pipe member 4 may be made of the same material or may be made of different materials. In this embodiment, the tubular metal member 3 (S35C) is made of a material with higher hardness than the pipe member 4 (S20C). The materials of the tubular fitting member 3 and the pipe member 4 include S10C, S12C, S15C, S17C, S20C, S22C, S25C, S28C, S30C, S33C, S35C, S38C, S40C, S43C, S45C, STKM11A, STKM12A, STKM13A, etc. Carbon steel for machine structural use can be exemplified. In addition, carbon steel or the like that satisfies the required performance of the hose fitting 1 can be used.

接合部となる部分には、下記（１）式により算出される炭素当量Ｃｅｑが０．１８％以上０．４３％以下の材質を使用するとよい。
炭素当量Ｃｅｑ＝[Ｃ]ｗ＋[Ｍｎ]ｗ／６＋[Ｓｉ]ｗ／２４＋[Ｎｉ]ｗ／４０＋[Ｃｒ]ｗ／５・・・（１）
ここで、[Ｃ]ｗ、[Ｍｎ]ｗ、[Ｓｉ]ｗ、[Ｎｉ]ｗ、[Ｃｒ]ｗはそれぞれ、接合部となる部分の材質中のＣ、Ｍｎ、Ｓｉ、Ｎｉ、Ｃｒの重量％である。 It is preferable to use a material having a carbon equivalent Ceq of 0.18% or more and 0.43% or less calculated by the following formula (1) for the joint portion.
Carbon equivalent Ceq=[C]w+[Mn]w/6+[Si]w/24+[Ni]w/40+[Cr]w/5 (1)
Here, [C]w, [Mn]w, [Si]w, [Ni]w, and [Cr]w are the weights of C, Mn, Si, Ni, and Cr in the material of the joint portion, respectively. %.

ホース金具１の使用内圧は例えば３５ＭＰａ以上の高圧であり、使用内圧の上限は例えば４２ＭＰａである。ホース金具１の内径は接続されるホース６の内径に応じて適切なサイズに設定される。このホース金具１に接続されるホース６の内径は例えば６ｍｍ以上５０ｍｍ以下であり、内径１９ｍｍ以上２５ｍｍ以下のホース６に多用される。 The working internal pressure of the hose fitting 1 is, for example, a high pressure of 35 MPa or higher, and the upper limit of the working internal pressure is, for example, 42 MPa. The inner diameter of the hose fitting 1 is set to an appropriate size according to the inner diameter of the hose 6 to be connected. The inner diameter of the hose 6 connected to the hose fitting 1 is, for example, 6 mm or more and 50 mm or less, and is often used for hoses 6 with an inner diameter of 19 mm or more and 25 mm or less.

図３に例示するように、ホース金具１のパイプ部材４と筒状金具部材３の接合面２ａ周辺の接合部のビッカース硬度ＨＶは１１７以上３４４以下になっている。接合部とは接合面２ａから筒状金具部材３側、パイプ部材４側にそれぞれ筒軸方向に所定距離ｄまでの範囲であり、図３では斜線部で示されている。この所定距離ｄは０．５ｍｍ、或いは０．４ｍｍ程度である。この接合部でビッカース硬度ＨＶを測定すると１１７以上３４４以下になる。図３の点ＣＬは、ベンド部４ａの曲げ中心を示している。この実施形態では、曲げ中心ＣＬと接合面２ａとの距離（筒軸方向距離）ｔが非常に小さく、５ｍｍ以下になっている。 As illustrated in FIG. 3, the Vickers hardness HV of the joint around the joint surface 2a between the pipe member 4 of the hose fitting 1 and the tubular fitting member 3 is 117 or more and 344 or less. The joint portion is a range from the joint surface 2a to the tubular metal member 3 side and the pipe member 4 side to a predetermined distance d in the axial direction of the cylinder, which is indicated by the hatched portion in FIG. This predetermined distance d is approximately 0.5 mm or 0.4 mm. When the Vickers hardness HV is measured at this joint portion, it is 117 or more and 344 or less. A point CL in FIG. 3 indicates the bending center of the bend portion 4a. In this embodiment, the distance (distance in the cylinder axis direction) t between the bending center CL and the joint surface 2a is very small, 5 mm or less.

ビッカース硬度ＨＶは、図３に例示するようにホース金具１を筒軸方向に切断した縦断面に対して測定すればよい。尚、ホース金具１の切断は、ホース金具１が過剰に加熱しないように水等で十分に冷やしながら行う。即ち、接合部の硬度がホース金具１を切断する際に発生する熱に起因して大きく変化しないようにする。メッキ加工によって、接合部断面のビッカース硬度ＨＶが実質的に変化することはないので、ビッカース硬度の測定は、曲げ加工後のメッキ加工の前であっても、メッキ加工の後であってもよい。 The Vickers hardness HV can be measured with respect to a longitudinal section of the hose fitting 1 cut in the cylinder axis direction, as shown in FIG. The hose fitting 1 is cut while being sufficiently cooled with water or the like so that the hose fitting 1 is not overheated. In other words, the hardness of the joint should not be greatly changed due to the heat generated when the hose fitting 1 is cut. Plating does not substantially change the Vickers hardness HV of the cross section of the joint, so the Vickers hardness may be measured either before plating after bending or after plating. .

以下、筒状金具部材３とパイプ部材４とを用いてホース金具１を製造する手順の一例を説明する。 An example of the procedure for manufacturing the hose fitting 1 using the tubular fitting member 3 and the pipe member 4 will be described below.

図４に例示するように、所定形状の筒状金具部材３と金属製の直線状パイプ部材４とを用意して、接合する端面どうしを対向させる。筒状金具部材３と直線状パイプ部材４の接合端面での互いの外径どうし、内径どうしは実質的に同じ寸法になっている。 As illustrated in FIG. 4, a tubular fitting member 3 having a predetermined shape and a straight pipe member 4 made of metal are prepared, and the end faces to be joined face each other. The outer diameters and the inner diameters of the tubular fitting member 3 and the linear pipe member 4 at the joint end surfaces are substantially the same.

次いで図５に例示するように、筒状金具部材３と直線状パイプ部材４とをそれぞれ、圧接装置８を構成する保持部８ａ、８ｂにより保持する。この実施形態では、筒状金具部材３は保持部８ａによって不動状態に保持される。直線状パイプ部材４は圧接装置８を構成する回転機構９によって回転駆動される保持部８ｂによって保持される。そして、筒状金具部材３と直線状パイプ部材４との対向する端面どうしを圧着させつつ、直線状パイプ部材４を回転機構９によって筒軸心を中心にして回転させる。これにより、筒状金具部材３と直線状パイプ部材４との対向する端面どうしを摩擦圧接接合して、互いを一体化させた一体物２を製造する。 Next, as illustrated in FIG. 5, the cylindrical fitting member 3 and the linear pipe member 4 are held by holding portions 8a and 8b constituting a pressure contact device 8, respectively. In this embodiment, the tubular metal fitting member 3 is held immovably by the holding portion 8a. The linear pipe member 4 is held by a holding portion 8b that is rotationally driven by a rotating mechanism 9 that constitutes the pressing device 8. As shown in FIG. Then, the straight pipe member 4 is rotated around the cylinder axis by the rotation mechanism 9 while the opposed end surfaces of the tubular metal fitting member 3 and the straight pipe member 4 are crimped to each other. As a result, the opposed end surfaces of the cylindrical metal fitting member 3 and the straight pipe member 4 are friction-welded to each other to manufacture an integrated product 2 that is integrated with each other.

摩擦圧接接合する際の互いの部材３、４を圧着させる圧着力、直線状パイプ部材４の回転速度については、事前テスト等を行って、互いの部材３、４を強固に接合でき、且つ、接合部のビッカース硬度ＨＶを上述した範囲内にすることができる条件を把握しておく。そして、この把握した条件の圧着力、回転速度で摩擦圧接接合を行えばよい。 Preliminary tests, etc., were conducted with respect to the crimping force for crimping the members 3 and 4 and the rotation speed of the linear pipe member 4 when friction welding is performed, so that the members 3 and 4 can be firmly joined, and The conditions under which the Vickers hardness HV of the joint can be within the above range are grasped. Then, the friction welding can be performed with the pressure bonding force and rotational speed under the comprehended conditions.

この摩擦圧接接合を行うと、筒状金具部材３と直線状パイプ部材４との接合部の外周面および内周面にはバリ５が発生する。そこで図６に例示するように、一体物２を回転機構９によって筒軸心を中心にして回転させつつ、切削工具１０を用いてバリ５を除去して、接合部の外周面および内周面を滑らかな周面に仕上げる。 When this friction welding is performed, burrs 5 are generated on the outer and inner peripheral surfaces of the joining portion between the tubular metal member 3 and the linear pipe member 4 . Therefore, as illustrated in FIG. 6, while rotating the unitary body 2 around the cylinder axis by the rotating mechanism 9, the burr 5 is removed using the cutting tool 10, and the outer peripheral surface and the inner peripheral surface of the joint are removed. to a smooth peripheral surface.

次いで図７に例示するように曲げ治具１２を用いて、一体物２のパイプ部材４に相当する範囲を所定形状に曲げ加工する。この実施形態では一体物２の内部にマンドレル１１を挿入した状態で、一体物２の一端部、他端部をそれぞれクランプ部１２ａにより保持して、直線状パイプ部材４を曲げロール１２ｂの外周面に沿って曲げる。この曲げ加工によって、所定の曲げ角度のベンド部４ａを有するホース金具１の形状になる。 Next, as shown in FIG. 7, a bending jig 12 is used to bend a range corresponding to the pipe member 4 of the integral 2 into a predetermined shape. In this embodiment, with the mandrel 11 inserted into the integral body 2, one end and the other end of the integral body 2 are held by the clamps 12a, respectively, and the linear pipe member 4 is bent on the outer peripheral surface of the roll 12b. Bend along. By this bending process, the shape of the hose fitting 1 having the bend portion 4a with a predetermined bending angle is obtained.

次いで図８に例示するように、曲げ加工した後のホース金具１をメッキ処理する。例えば、ホース金具１の表面に所定の下処理（酸洗浄など）を施した後に、メッキ槽１３に貯留されているメッキ液に漬けて付着させる。その後、ホース金具１に付着したメッキ液を乾燥させてホース金具１が完成する。 Next, as illustrated in FIG. 8, the hose fitting 1 after bending is plated. For example, the surface of the hose fitting 1 is subjected to a predetermined pretreatment (acid cleaning, etc.) and then immersed in the plating solution stored in the plating tank 13 to adhere. After that, the plating liquid adhering to the hose fitting 1 is dried to complete the hose fitting 1. - 特許庁

摩擦圧接接合によって接合部は焼き入れされて硬度が高くなり、さらに曲げ加工により接合部には曲げ応力が生じる。その後、メッキ加工における酸洗浄時に発生する水素が接合部に吸収されて接合部が脆化する。このように接合部は、高い硬度、曲げ応力、水素脆化の要件が揃うことで割れＣが発生し易くなる。 The joint is quenched and hardened by friction welding, and bending stress is generated in the joint by bending. After that, hydrogen generated during acid cleaning in the plating process is absorbed by the joint and the joint becomes embrittled. In this way, cracks C are likely to occur in joints when the requirements for high hardness, bending stress, and hydrogen embrittlement are met.

接合部のビッカース硬度ＨＶが３４４超になると、メッキ加工後に図９に例示するように、接合部の曲げ外周側の表面に割れＣが発生し易くなる。この割れＣは、筒状金具部材３とパイプ部材４の硬度が異なる場合は、硬度がより高い部材に発生する。また、接合部（接合面２ａ）がベンド部４ａの曲げ中心ＣＬに近い程、割れＣは発生し易くなる。例えば、曲げ中心ＣＬと接合面２ａとの距離ｔが１０ｍｍ以下であると割れＣが発生し易くなる。 When the Vickers hardness HV of the joint exceeds 344, cracks C are likely to occur on the surface of the joint on the bending outer peripheral side after plating, as shown in FIG. 9 . If the tubular metal fitting member 3 and the pipe member 4 have different hardnesses, the crack C occurs in the member with the higher hardness. Also, the closer the joint portion (joint surface 2a) is to the bending center CL of the bend portion 4a, the more easily the crack C occurs. For example, if the distance t between the bending center CL and the joint surface 2a is 10 mm or less, cracks C are likely to occur.

そこで本発明では、曲げ加工した後のメッキ加工前のホース金具１のパイプ部材４と筒状金具部材３の接合部の断面におけるビッカース硬度ＨＶが１１７以上３４４以下になるようにしている。即ち、接合部のビッカース硬度ＨＶを３４４以下に抑えることで接合部に割れＣが発生し難くなっている。 Therefore, in the present invention, the Vickers hardness HV in the cross section of the joint between the pipe member 4 and the tubular metal member 3 of the hose fitting 1 after bending and before plating is set to 117 or more and 344 or less. That is, by suppressing the Vickers hardness HV of the joint to 344 or less, cracks C are less likely to occur in the joint.

硬度と部材中の炭素当量Ｃｅｑには相関関係があり、炭素当量Ｃｅｑが大きくなるに連れて、摩擦圧接接合する際の焼き入れ効果が増大して部材の硬度が高くなる。そこで、接合部となる部分に、上記（１）式により算出される炭素当量Ｃｅｑを０．１８％以上０．４３％以下の材質を使用することで、接合部のビッカース硬度ＨＶを１１７以上３４４以下にし易くなる。 There is a correlation between the hardness and the carbon equivalent Ceq in the member, and as the carbon equivalent Ceq increases, the effect of quenching during friction welding increases and the hardness of the member increases. Therefore, by using a material having a carbon equivalent Ceq of 0.18% or more and 0.43% or less calculated by the above formula (1) for the portion to be the joint, the Vickers hardness HV of the joint is 117 or more and 344. It becomes easier to:

また、接合部のビッカース硬度ＨＶを１７７以上にすることで、ホース金具１の実用に耐え得る耐圧性、耐久性を確保している。接合部のビッカース硬度ＨＶが１７７未満であると、ホース金具１の耐圧性、耐久性を十分に確保できない。特に、ホース金具１の使用内圧が３５ＭＰａ以上の場合、ホース金具１の十分な耐圧性、耐久性を確保するにはビッカース硬度ＨＶを１７７以上にすることが重要である。 Further, by setting the Vickers hardness HV of the joint portion to 177 or more, pressure resistance and durability that can withstand practical use of the hose fitting 1 are ensured. If the Vickers hardness HV of the joint is less than 177, the pressure resistance and durability of the hose fitting 1 cannot be sufficiently ensured. In particular, when the working internal pressure of the hose fitting 1 is 35 MPa or more, it is important to set the Vickers hardness HV to 177 or more in order to secure sufficient pressure resistance and durability of the hose fitting 1 .

図１～３に例示したホース金具（内径は２０ｍｍとした）と同様の形状の試験サンプルを、図４～図８に例示した工程を経て１０種類（比較例１～５、実施例１～５）製造した。それぞれの試験サンプルは表１に示すように、曲げ加工後のメッキ加工前における接合部のビッカース硬度、材質を異ならせたものであり、その他の条件は基本的に同じにした。 10 types of test samples (comparative examples 1 to 5, examples 1 to 5) having the same shape as the hose fittings (with an inner diameter of 20 mm) illustrated in FIGS. ) manufactured. As shown in Table 1, each test sample was different in Vickers hardness and material of the joint before plating after bending, and other conditions were basically the same.

Figure 0007287000000001
Figure 0007287000000001

それぞれの試験サンプルの接合部での割れの有無を確認した。割れが発生していない試験サンプルについては、下記のインパルス試験を行って耐圧性、耐久性を確認した。その結果を表１に示す。比較例１～４の試験サンプルでは、接合部の筒状金具部材側で割れが発生した。 The presence or absence of cracks at the joints of each test sample was checked. The test samples with no cracks were subjected to the following impulse test to confirm pressure resistance and durability. Table 1 shows the results. In the test samples of Comparative Examples 1 to 4, cracks occurred on the side of the cylindrical metal fitting member of the joint.

[インパルス試験]
ホースを接続した試験サンプルをホース内側曲げ半径２４０ｍｍの状態に屈曲させた状態で、１００℃の温度条件下、圧力を３５ＭＰａ×１３３％の台形波で１．１７Ｈｚのサイクルで、繰り返し内圧（油圧）を加えてた。内圧を５０万回加えた時にホース金具の破損の有無を確認し、破損が無い場合は内圧をさらに５０万回（トータルで１００万回）加えた。内圧を１００万回加えた時点で破損が無ければ、十分な耐圧性、耐久性を有していると判断できる。 [Impulse test]
With the test sample connected to the hose bent to a hose inner bending radius of 240 mm, the internal pressure (hydraulic pressure) was repeatedly applied at a temperature of 100 ° C. with a trapezoidal wave of 35 MPa × 133% and a cycle of 1.17 Hz. was added. When the internal pressure was applied 500,000 times, the presence or absence of breakage of the hose fitting was checked, and if there was no breakage, the internal pressure was further applied 500,000 times (1,000,000 times in total). If there is no breakage when the internal pressure is applied one million times, it can be judged to have sufficient pressure resistance and durability.

表１の結果から、接合部のビッカース硬度ＨＶが１１７以上３４４以下の範囲にある実施例１～５のホース金具は製造後に割れがなく、且つ、十分な耐圧性、耐久性を有していることが分かる。 From the results in Table 1, the hose fittings of Examples 1 to 5 having a joint portion with a Vickers hardness HV in the range of 117 or more and 344 or less had no cracks after production and had sufficient pressure resistance and durability. I understand.

１ ホース金具
２ 一体物
２ａ 接合面
３ 筒状金具部材
４ パイプ部材
４ａ ベンド部
５ バリ
６ ホース
７ 圧接装置
８ａ、８ｂ 保持部
９ 回転機構
１０ 切削工具
１１ マンドレル
１２ 曲げ治具
１２ａ クランプ部
１２ｂ 曲げロール
１３ メッキ槽
Ｃ 割れ 1 Hose fitting 2 Integrated object 2a Joint surface 3 Cylindrical fitting member 4 Pipe member 4a Bend portion 5 Burr 6 Hose 7 Pressure welding device 8a, 8b Holding portion 9 Rotation mechanism 10 Cutting tool 11 Mandrel 12 Bending jig 12a Clamp portion 12b Bending roll 13 Plating tank C Crack

Claims (3)

金属製の直線状パイプ部材と所定形状の筒状金具部材とを、互いの対向する端面どうしを摩擦圧接接合することにより一体化させた一体物を製造し、この一体物の前記パイプ部材に相当する範囲を所定形状に曲げ加工し、且つ、メッキ加工をすることより、ベンド部を有し、使用内圧が３５ＭＰａ以上のホース金具を製造するホース金具の製造方法において、
前記摩擦圧接接合の条件を調整することにより、前記曲げ加工後の前記メッキ加工の前に前記ホース金具の前記パイプ部材と前記筒状金具部材の接合部のビッカース硬度ＨＶの上昇を抑えて前記接合部のビッカース硬度ＨＶを１１７以上３４４以下にし、前記接合部は前記パイプ部材と前記金具部材の接合面から前記金具部材側および前記パイプ部材側にそれぞれ、前記金具部材の筒軸方向に０．５ｍｍまでの範囲であり、前記曲げ加工の曲げ中心と前記接合面との前記筒軸方向の距離が１０ｍｍ以下であることを特徴とするホース金具の製造方法。Manufacture of an integral body in which a metal linear pipe member and a cylindrical fitting member of a predetermined shape are joined by friction welding the opposing end surfaces thereof, and corresponds to the pipe member of this integral body A hose fitting manufacturing method for manufacturing a hose fitting having a bent portion and a working internal pressure of 35 MPa or more by bending the range to a predetermined shape and plating the hose fitting,
By adjusting the conditions of the friction welding, before the plating process after the bending process , an increase in the Vickers hardness HV of the joint between the pipe member and the tubular metal fitting member of the hose fitting is suppressed. The Vickers hardness HV of the part is set to 117 or more and 344 or less, and the joint part has a hardness of 0.00 in the cylinder axis direction of the metal fitting member from the joint surface of the pipe member and the metal fitting member to the metal fitting member side and the pipe member side, respectively. A method for manufacturing a hose fitting , wherein the distance between the bending center of the bending process and the joining surface in the cylinder axis direction is 10 mm or less. 前記接合部となる部分には、下記（１）式により算出される炭素当量Ｃｅｑが０．１８％以上０．４３％以下の材質を使用する請求項１に記載のホース金具の製造方法。
炭素当量Ｃｅｑ＝[Ｃ]ｗ＋[Ｍｎ]ｗ／６＋[Ｓｉ]ｗ／２４＋[Ｎｉ]ｗ／４０＋[Ｃｒ]ｗ／５・・・（１）
ここで、[Ｃ]ｗ、[Ｍｎ]ｗ、[Ｓｉ]ｗ、[Ｎｉ]ｗ、[Ｃｒ]ｗはそれぞれ、前記接合部となる部分の材質中のＣ、Ｍｎ、Ｓｉ、Ｎｉ、Ｃｒの重量％である。 2. The method for manufacturing a hose fitting according to claim 1, wherein the joint portion is made of a material having a carbon equivalent Ceq of 0.18% or more and 0.43% or less calculated by the following formula (1).
Carbon equivalent Ceq=[C]w+[Mn]w/6+[Si]w/24+[Ni]w/40+[Cr]w/5 (1)
Here, [C]w, [Mn]w, [Si]w, [Ni]w, and [Cr]w are C, Mn, Si, Ni, and Cr in the material of the joint portion, respectively. % by weight. 前記曲げ加工による前記ベンド部の曲げ角度を４５°以上９０°以下にする請求項１または２に記載のホース金具の製造方法。 3. The method for manufacturing a hose fitting according to claim 1, wherein the bend angle of the bend portion formed by the bending process is set to 45[deg.] or more and 90[deg.] or less.
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Citations (4)

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Publication number Priority date Publication date Assignee Title
US20070284878A1 (en) 2005-07-18 2007-12-13 Titeflex Corporation Sealing fitting for stainless steel tubing
JP2015080789A (en) 2013-10-21 2015-04-27 ブリヂストンフローテック株式会社 Pipe body joining structure
WO2017022184A1 (en) 2015-07-31 2017-02-09 国立大学法人大阪大学 Friction bonding method
JP2017211010A (en) 2016-05-25 2017-11-30 日立金属株式会社 Hydraulic piping hose, brake hose, and hose mouthpiece

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10263851A (en) * 1997-03-21 1998-10-06 Tokai Rubber Ind Ltd Manufacture of tube joint

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070284878A1 (en) 2005-07-18 2007-12-13 Titeflex Corporation Sealing fitting for stainless steel tubing
JP2015080789A (en) 2013-10-21 2015-04-27 ブリヂストンフローテック株式会社 Pipe body joining structure
WO2017022184A1 (en) 2015-07-31 2017-02-09 国立大学法人大阪大学 Friction bonding method
JP2017211010A (en) 2016-05-25 2017-11-30 日立金属株式会社 Hydraulic piping hose, brake hose, and hose mouthpiece

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