WO2022050054A1 - Method for joining dissimilar materials, and dissimilar-material joined body - Google Patents

Method for joining dissimilar materials, and dissimilar-material joined body Download PDF

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WO2022050054A1
WO2022050054A1 PCT/JP2021/030270 JP2021030270W WO2022050054A1 WO 2022050054 A1 WO2022050054 A1 WO 2022050054A1 JP 2021030270 W JP2021030270 W JP 2021030270W WO 2022050054 A1 WO2022050054 A1 WO 2022050054A1
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rivet
aluminum
collar
steel material
steel
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PCT/JP2021/030270
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French (fr)
Japanese (ja)
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哲 岩瀬
美速 今村
真三樹 奥田
孝良 杉崎
崇志 後藤
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株式会社神戸製鋼所
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Publication of WO2022050054A1 publication Critical patent/WO2022050054A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/10—Spot welding; Stitch welding
    • B23K11/11—Spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded
    • B23K11/20—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded of different metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/04—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of riveting

Definitions

  • FIG. 6 is a process explanatory view showing a state in which a steel material and an aluminum material are subjected to resistance spot welding using rivets.
  • FIG. 7 is an explanatory diagram showing the state from the pressurization between the electrodes to the energization stepwise in (A) to (C).
  • FIG. 8 is a process explanatory view showing another procedure for fixing the rivet to the steel material.
  • FIG. 9 is a process explanatory view showing another procedure for fixing the rivet to the steel material.
  • FIG. 10 is a cross-sectional photograph of the joint portion.
  • FIG. 6 is a process explanatory view showing a state in which a steel material 33 and an aluminum material 37 are spot-welded by resistance using a rivet 11.
  • a set of a plate material obtained by superimposing a steel material 33 to which the rivet 11 is attached and an aluminum material 37 is sandwiched between a pair of electrodes 43 and 45 at the position of the rivet 11.
  • a pressurizing device not shown
  • energization is performed between the electrodes by a power supply device (not shown) (current I).
  • a nugget is formed between the tip surface 15a of the shaft portion of the rivet 11 and the aluminum material 37.
  • FIG. 8 is a process explanatory view showing another procedure for fixing the rivet 11 to the steel material 33.
  • a through hole 34 serving as a pilot hole is provided at a portion of the steel material 33 where the rivet 11 is provided.
  • the collar 21 is attached to the rivet 11.
  • the shaft portion 15 of the rivet 11 to which the collar 21 is mounted is pushed into the through hole 4 by a press or the like to penetrate the rivet 11, and the rivet 11 is caulked and fixed to the steel material 33.
  • the rivet can be satisfactorily spot-welded to the aluminum material to bond the steel material and the aluminum material with good and high strength. Further, since the process of inserting the rivet into the prepared hole of the steel material can be performed at an arbitrary timing such as a process before and after the press forming process of the steel material or a process before and after the press forming process, the degree of freedom of the process can be improved. ..

Abstract

An annular collar having a higher melting point than aluminum is fitted to a shaft section and attached to an aluminum rivet having a head section and the shaft section, and the shaft section of the rivet, to which the collar is attached, is either driven into a steel material so as to pass therethrough, or the collar and the shaft section are made to pass through a through-hole provided to the steel material. The tip-side of the shaft section of the steel material rivet is made to face an aluminum material, and the steel material and the aluminum material are positioned so as to overlap. The rivet and the aluminum material are sandwiched by a pair of electrodes, and resistance spot welding is carried out while being pressurized between the electrodes.

Description

異材接合方法及び異材接合体Dissimilar material joining method and dissimilar material joining body
　本発明は、異材接合方法及び異材接合体に関する。 The present invention relates to a dissimilar material joining method and a dissimilar material joining body.
　近年の排気ガス等による地球環境問題に対して、自動車等の輸送機における車体の軽量化によって燃費の向上を図る取り組みがなされている。例えば、自動車の車体構造に対しては、車体の軽量化をできるだけ阻害せずに車体衝突時の安全性を高めるため、従来から使用されている鋼材の一部を、より軽量でエネルギー吸収性にも優れたアルミニウム合金材等の軽合金材に置換されつつある。 In response to global environmental problems caused by exhaust gas in recent years, efforts have been made to improve fuel efficiency by reducing the weight of the vehicle body of transport aircraft such as automobiles. For example, for the car body structure, in order to improve the safety in the event of a car body collision without hindering the weight reduction of the car body as much as possible, some of the steel materials that have been used conventionally are made lighter and more energy absorbent. Is being replaced by light alloy materials such as excellent aluminum alloy materials.
　これらのアルミニウム合金材は、車体の全ての部分をアルミニウム合金材で構成しない限り、通常の自動車の車体で元々汎用されている鋼板又は型鋼等の鋼材と組み合わせて使用するため、必然的にアルミニウム合金材と鋼材との異種金属同士の接合（異材接合）が必要となる。 Unless all parts of the car body are made of aluminum alloy material, these aluminum alloy materials are inevitably used in combination with steel materials such as steel plates or mold steels that are originally used in ordinary automobile car bodies. It is necessary to join dissimilar metals between materials and steel materials (dissimilar material joining).
　特許文献１には、鋼製のリベットにより鋼材とアルミニウム合金材とを接合する技術が開示されている。また、このリベットによる接合を応用した技術として、特許文献２には、複数枚のアルミニウム材をアルミニウム製のリベットを用いて接合させる技術が開示されている。 Patent Document 1 discloses a technique for joining a steel material and an aluminum alloy material with steel rivets. Further, as a technique applying this joining by rivets, Patent Document 2 discloses a technique of joining a plurality of aluminum materials using aluminum rivets.
日本国特開２０１０－２０７８９８号公報Japanese Patent Application Laid-Open No. 2010-207988 日本国特開２０１８－７９４７６号公報Japanese Patent Application Laid-Open No. 2018-79476
　しかし、アルミニウム製のリベットとアルミニウム材とを抵抗スポット溶接する場合、溶接電流が鋼材の抵抗スポット溶接よりも大電流（約３倍）となり、鋼材と接するアルミニウム材の接触箇所の入熱が著しく大きくなる。そのため、リベット及びアルミニウム材が溶融した溶融アルミニウムが、接合箇所の外部に流れ出す現象（チリの発生）が生じ、その結果、ナゲットサイズが小さくなり、接合強度の低下を招くことになる。 However, when the aluminum rivet and the aluminum material are resistance spot welded, the welding current becomes larger (about 3 times) than the resistance spot welding of the steel material, and the heat input at the contact point of the aluminum material in contact with the steel material is remarkably large. Become. Therefore, the molten aluminum in which the rivet and the aluminum material are melted flows out to the outside of the joint portion (generation of dust), and as a result, the nugget size becomes small and the joint strength is lowered.
　そこで本発明は、異材同士の接合にアルミニウム製のリベットを使用して抵抗スポット溶接する場合に、溶接部近傍の溶融アルミニウムの流れ出しを抑制して良好な接合ができる異材接合方法及び異材接合体を提供することを目的とする。 Therefore, the present invention provides a dissimilar material joining method and a dissimilar material joining body capable of performing good joining by suppressing the outflow of molten aluminum in the vicinity of the welded portion when resistance spot welding is performed using aluminum rivets for joining dissimilar materials. The purpose is to provide.
　本発明は下記の構成からなる。
（１）　頭部と軸部とを有するアルミニウム製のリベットの前記軸部に、アルミニウムよりも融点の高い環状のカラーを取り付け、
　前記カラーが取り付けられた前記リベットの前記軸部を、鋼材に打ち込んで貫通させ、
　前記鋼材の前記リベットの軸部先端をアルミニウム材に対向させて、前記鋼材と前記アルミニウム材とを重ねて配置し、
　前記リベットと前記アルミニウム材とを、一対の電極で挟み込み、前記電極間で加圧しながら抵抗スポット溶接して、前記アルミニウム材と前記鋼材とを接合する、
異材接合方法。
（２）　貫通孔を設けた鋼材の前記貫通孔に、頭部と軸部とを有するアルミニウム製のリベットの前記軸部を、アルミニウムよりも融点の高い環状のカラーを介して貫通させて取り付け、
　前記鋼材の前記リベットの軸部先端をアルミニウム材に対向させて、前記鋼材と前記アルミニウム材とを重ねて配置し、
　前記リベットと前記アルミニウム材とを、一対の電極で挟み込み、前記電極間で加圧しながら抵抗スポット溶接して、前記アルミニウム材と前記鋼材とを接合する、
異材接合方法。
（３）　互いに重ね合わされた鋼材とアルミニウム材とが、軸部と頭部を有するアルミニウム製のリベットで接合された異材接合体であって、
　前記鋼材と前記リベットとの間に、アルミニウムよりも融点の高い環状のカラーが配置され、
　前記カラーの内径側に、前記リベットと前記アルミニウム材とが溶融、凝固したナゲットが形成されている、
異材接合体。 The present invention has the following configuration.
(1) An annular collar having a melting point higher than that of aluminum is attached to the shaft portion of an aluminum rivet having a head and a shaft portion.
The shaft portion of the rivet to which the collar is attached is driven into a steel material and penetrated.
The tip of the shaft portion of the rivet of the steel material is opposed to the aluminum material, and the steel material and the aluminum material are placed on top of each other.
The rivet and the aluminum material are sandwiched between a pair of electrodes, and resistance spot welding is performed while pressurizing between the electrodes to join the aluminum material and the steel material.
Dissimilar material joining method.
(2) The shaft portion of an aluminum rivet having a head and a shaft portion is attached to the through hole of a steel material provided with a through hole through an annular collar having a melting point higher than that of aluminum.
The tip of the shaft portion of the rivet of the steel material is opposed to the aluminum material, and the steel material and the aluminum material are placed on top of each other.
The rivet and the aluminum material are sandwiched between a pair of electrodes, and resistance spot welding is performed while pressurizing between the electrodes to join the aluminum material and the steel material.
Dissimilar material joining method.
(3) The steel material and the aluminum material superposed on each other are dissimilar material joints joined by aluminum rivets having a shaft portion and a head.
An annular collar having a melting point higher than that of aluminum is placed between the steel material and the rivet.
A nugget in which the rivet and the aluminum material are melted and solidified is formed on the inner diameter side of the collar.
Dissimilar material joint.
　本発明によれば、異材同士の接合にアルミニウム製のリベットを使用して抵抗スポット溶接する場合に、溶接部近傍の溶融アルミニウムの流れ出しを抑制して良好な接合が可能となる。 According to the present invention, when resistance spot welding is performed using aluminum rivets for joining dissimilar materials, it is possible to suppress the outflow of molten aluminum in the vicinity of the welded portion and perform good joining.
図１Ａは、カラーを取り付けたリベットを示す図であって、リベットの頭部側から見た外観斜視図である。FIG. 1A is a view showing a rivet to which a collar is attached, and is an external perspective view of the rivet as viewed from the head side. 図１Ｂは、カラーを取り付けたリベットを示す図であって、リベットの軸部側から見た外観斜視図である。FIG. 1B is a view showing a rivet to which a collar is attached, and is an external perspective view seen from the shaft portion side of the rivet. 図２は、図１Ａ，図１Ｂに示すリベット及びカラーの軸方向断面図である。FIG. 2 is an axial sectional view of the rivet and collar shown in FIGS. 1A and 1B. 図３は、リベットとカラーの分解斜視図である。FIG. 3 is an exploded perspective view of rivets and colors. 図４は、リベットを鋼材に打ち込む工程を（Ａ）～（Ｃ）に段階的に示す工程説明図である。FIG. 4 is a process explanatory view showing the process of driving the rivet into the steel material step by step in (A) to (C). 図５は、カラーを装着したリベットが打ち込まれた鋼材を、アルミニウム材と重ねる様子を示す工程説明図である。FIG. 5 is a process explanatory view showing a state in which a steel material in which a rivet with a collar is driven is overlapped with an aluminum material. 図６は、鋼材とアルミニウム材とをリベットを用いて抵抗スポット溶接する様子を示す工程説明図である。FIG. 6 is a process explanatory view showing a state in which a steel material and an aluminum material are subjected to resistance spot welding using rivets. 図７は、電極間を加圧してから通電するまでの様子を（Ａ）～（Ｃ）に段階的に示す説明図である。FIG. 7 is an explanatory diagram showing the state from the pressurization between the electrodes to the energization stepwise in (A) to (C). 図８は、鋼材にリベットを固定する他の手順を示す工程説明図である。FIG. 8 is a process explanatory view showing another procedure for fixing the rivet to the steel material. 図９は、鋼材にリベットを固定する他の手順を示す工程説明図である。FIG. 9 is a process explanatory view showing another procedure for fixing the rivet to the steel material. 図１０は、接合箇所の断面写真である。FIG. 10 is a cross-sectional photograph of the joint portion.
　以下、本発明の実施形態について、図面を参照して詳細に説明する。
　本発明の異材接合方法においては、アルミニウム製のリベットを使用して、鋼材とアルミニウム材とを抵抗スポット溶接する際に、リベットの軸部を環状のカラーで覆うことで溶融アルミニウムの飛び出しを抑制している。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the dissimilar material joining method of the present invention, when aluminum rivets are used and resistance spot welding is performed between a steel material and an aluminum material, the shaft portion of the rivet is covered with an annular collar to prevent the molten aluminum from popping out. ing.
＜リベットの構成＞
　図１Ａは、カラーを取り付けたリベットを示す図であって、リベットの頭部側から見た外観斜視図、図１Ｂは、カラーを取り付けたリベットを示す図であって、リベットの軸部側から見た外観斜視図である。図２は、図１Ａ，図１Ｂに示すリベット及びカラーの軸方向断面図である。図３は、リベットとカラーの分解斜視図である。 <Rivet composition>
FIG. 1A is a view showing a rivet with a collar attached, and is an external perspective view seen from the head side of the rivet. FIG. 1B is a view showing a rivet with a collar attached, from the shaft portion side of the rivet. It is an external perspective view as seen. FIG. 2 is an axial sectional view of the rivet and collar shown in FIGS. 1A and 1B. FIG. 3 is an exploded perspective view of rivets and colors.
　リベット１１は、図１Ａ、図１Ｂ、図２に示すように、頭部１３と軸部１５とを有する。頭部１３は、軸部１５より大径の円板形状であり、軸部１５は、略円柱形状であって、リベット１１の中心軸Ｌに沿って頭部１３から突出する。軸部先端面１５ａは、プロジェクションとなる円錐状の突起１７を有するが、プロジェクションに限らず、所定の曲率半径で突出する湾曲面であってもよく、平坦面であってもよい。このリベット１１はアルミニウム製であって、図３に示すように、軸部１５には軸部外周を覆うカラー２１が装着される。 The rivet 11 has a head portion 13 and a shaft portion 15 as shown in FIGS. 1A, 1B, and 2. The head portion 13 has a disk shape having a diameter larger than that of the shaft portion 15, and the shaft portion 15 has a substantially cylindrical shape and protrudes from the head portion 13 along the central axis L of the rivet 11. The tip surface 15a of the shaft portion has a conical protrusion 17 that serves as a projection, but is not limited to the projection, and may be a curved surface projecting with a predetermined radius of curvature or a flat surface. The rivet 11 is made of aluminum, and as shown in FIG. 3, the shaft portion 15 is equipped with a collar 21 that covers the outer circumference of the shaft portion.
　カラー２１は、筒状部２３と、筒状部２３の軸方向一端から径方向外側へ張り出す環状のフランジ部２５と、を有する。筒状部２３の内周面２３ａは、中心軸Ｌの直交断面が円形であり、リベット１１の軸部外周面１５ｂを覆う。フランジ部２５の互いに対向するリベット側環状面２５ａと挿入側環状面２５ｂとは、いずれも互いに平行な平坦面で形成されている。カラー２１の材質は、リベット１１の材料であるアルミニウムよりも高い融点を有していればよく、鋼材を用いることができる。 The collar 21 has a tubular portion 23 and an annular flange portion 25 that projects radially outward from one axial end of the tubular portion 23. The inner peripheral surface 23a of the tubular portion 23 has a circular cross section orthogonal to the central axis L and covers the outer peripheral surface 15b of the shaft portion of the rivet 11. The rivet-side annular surface 25a and the insertion-side annular surface 25b of the flange portion 25 facing each other are both formed of flat surfaces parallel to each other. The material of the collar 21 may have a melting point higher than that of aluminum, which is the material of the rivet 11, and a steel material can be used.
　このカラー２１は、筒状部２３の内周にリベット１１の軸部１５を挿し込むことでリベット１１に装着される。リベット１１の軸部外周面１５ｂとカラー２１の内周面２３ａとは、隙間なく密着することが好ましい。軸部外周面１５ｂと内周面２３ａとを互いに嵌合させることで、カラー２１の抜け落ちを防止して、ハンドリング性を向上できる。また、カラー２１の筒状部２３の反フランジ側端面２３ｃは、リベット１１の軸部１５の軸方向に関して、軸部先端面１５ａの外周縁１５ｃの高さと等しいか、外周縁１５ｃよりも低く形成される。つまり、カラー２１は、その筒状部２３が軸部１５の軸部先端面１５ａの外周縁１５ｃから突出されずにリベット１１に装着されることが好ましい。また、フランジ部２５は、リベット１１の頭部裏面１３ａに密着することが好ましい。 This collar 21 is attached to the rivet 11 by inserting the shaft portion 15 of the rivet 11 into the inner circumference of the tubular portion 23. It is preferable that the outer peripheral surface 15b of the shaft portion of the rivet 11 and the inner peripheral surface 23a of the collar 21 are in close contact with each other without a gap. By fitting the outer peripheral surface 15b of the shaft portion and the inner peripheral surface 23a to each other, it is possible to prevent the collar 21 from coming off and improve the handling property. Further, the end surface 23c on the anti-flange side of the tubular portion 23 of the collar 21 is formed to be equal to or lower than the height of the outer peripheral edge 15c of the shaft portion tip surface 15a with respect to the axial direction of the shaft portion 15 of the rivet 11. Will be done. That is, it is preferable that the cylindrical portion 23 of the collar 21 is mounted on the rivet 11 without projecting from the outer peripheral edge 15c of the shaft portion tip surface 15a of the shaft portion 15. Further, it is preferable that the flange portion 25 is in close contact with the back surface 13a of the head of the rivet 11.
＜鋼材とアルミニウム材の材質＞
　ここで用いる鋼材としては、高張力鋼材、亜鉛めっき鋼板及びステンレス鋼等が挙げられる。この鋼材は、板材、形材、鋳物材、板材のプレス成形品、又はホットスタンプ品等を利用できる。
　また、アルミニウム材としては、アルミニウム、アルミニウム合金（ＪＩＳ規格の２０００系、３０００系、４０００系、５０００系、６０００系又は７０００系）が挙げられる。溶接性の観点から、特に５０００系、６０００系、７０００系のアルミニウム合金であることが好ましい。このアルミニウム材は、板材に限らず、押出部材（パイプ材又は、中空、中実、異形断面の形材）、鍛造材（板材、リブ付材）であってもよい。さらに、アルミニウム材３７の表面に、予備処理としてブラスト処理、エッチング処理、ブラシ研磨処理等の各種表面処理を施してもよい。その場合、アルミニウム材の表面の有機物が除去されて、接合品質が向上する。 <Materials of steel and aluminum>
Examples of the steel material used here include high-strength steel materials, galvanized steel sheets, and stainless steel. As this steel material, a plate material, a profile material, a casting material, a press-molded product of a plate material, a hot stamped product, or the like can be used.
Examples of the aluminum material include aluminum and aluminum alloys (JIS standard 2000 series, 3000 series, 4000 series, 5000 series, 6000 series or 7000 series). From the viewpoint of weldability, 5000 series, 6000 series, and 7000 series aluminum alloys are particularly preferable. This aluminum material is not limited to a plate material, and may be an extruded member (pipe material or a hollow, solid, irregular cross-section profile) or a forged material (plate material, ribbed material). Further, the surface of the aluminum material 37 may be subjected to various surface treatments such as a blast treatment, an etching treatment, and a brush polishing treatment as a preliminary treatment. In that case, organic substances on the surface of the aluminum material are removed, and the joining quality is improved.
＜異材接合方法の手順＞
　次に、上記のリベット１１を使用して、アルミニウム材と鋼材とを異材接合する手順を説明する。 <Procedure of dissimilar material joining method>
Next, a procedure for joining the aluminum material and the steel material to different materials by using the above rivet 11 will be described.
（打ち込み工程）
　図４は、リベット１１を鋼材３３に打ち込む工程を（Ａ）～（Ｃ）に段階的に示す工程説明図である。
　図４の（Ａ）に示すように、上部が円筒状のダイ３１の上に板状の鋼材３３を載置し、カラー２１が装着されたリベット１１をこのダイ３１の上方に配置する。そして、リベット１１の頭部１３をポンチ３５で押し下げる。 (Driving process)
FIG. 4 is a process explanatory view showing the process of driving the rivet 11 into the steel material 33 step by step in (A) to (C).
As shown in FIG. 4A, a plate-shaped steel material 33 is placed on a die 31 having a cylindrical upper portion, and a rivet 11 on which the collar 21 is mounted is placed above the die 31. Then, the head 13 of the rivet 11 is pushed down by the punch 35.
　図４の（Ｂ）に示すように、ポンチ３５が下降すると、リベット１１の軸部１５とカラー２１とが鋼材３３に打ち込まれる。すると、鋼材３３は、カラー２１の筒状部２３と軸部１５によってダイ３１との間で打ち抜かれ、この打ち抜かれた部分（ブランク）３３Ａがダイ３１の内側に落下する。 As shown in FIG. 4B, when the punch 35 is lowered, the shaft portion 15 and the collar 21 of the rivet 11 are driven into the steel material 33. Then, the steel material 33 is punched between the die 31 by the tubular portion 23 of the collar 21 and the shaft portion 15, and the punched portion (blank) 33A falls inside the die 31.
　こうして、図４の（Ｃ）に示すように、カラー２１の挿着されたリベット１１が鋼材３３に嵌合される。このとき、リベット１１の軸部１５は、鋼材３３にかしめ固定され、カラー２１のフランジ部２５は、リベット１１の頭部裏面１３ａと鋼材３３との間に挟まれて、頭部裏面１３ａとリベット側環状面２５ａとが密着する。 Thus, as shown in FIG. 4 (C), the inserted rivet 11 of the collar 21 is fitted to the steel material 33. At this time, the shaft portion 15 of the rivet 11 is caulked and fixed to the steel material 33, and the flange portion 25 of the collar 21 is sandwiched between the head back surface 13a of the rivet 11 and the steel material 33, and the head back surface 13a and the rivet. It comes into close contact with the side annular surface 25a.
　つまり、リベット１１の軸部外周面１５ｂとカラー２１の内周面２３ａとが隙間なく密着され、さらに、カラー２１の外周面２３ｂと鋼材３３に形成された貫通孔３４の内周面とが隙間なく密着される。また、鋼材３３を貫通したリベット１１の軸部１５は、その軸部先端面１５ａが鋼材３３の下面に露出する。 That is, the outer peripheral surface 15b of the shaft portion of the rivet 11 and the inner peripheral surface 23a of the collar 21 are in close contact with each other without a gap, and further, the outer peripheral surface 23b of the collar 21 and the inner peripheral surface of the through hole 34 formed in the steel material 33 are in close contact with each other. It is closely attached. Further, in the shaft portion 15 of the rivet 11 penetrating the steel material 33, the tip surface 15a of the shaft portion is exposed on the lower surface of the steel material 33.
　このようなカラー２１を装着したリベット１１の打ち込みは、例えば、鋼材３３のプレス成形工程（トリミング工程）にて、プレス成形と同時に行ってもよい。即ち、鋼材３３をプレス成形する際に、プレスの型にポンチを設置し、又はポンチの代わりにプレス型自体を使用して、リベット１１をプレス型の下降と同時に打ち抜く。これにより、リベット１１が鋼材３３にかしめ固定される。この状態では、鋼材３３が抵抗スポット溶接ラインに搬送される際、リベット１１は鋼材３３にかしめ固定されているので、搬送の過程でリベット１１が落下することがなく、接合の施工性を高められる。 The driving of the rivet 11 equipped with such a collar 21 may be performed at the same time as the press forming in, for example, the press forming step (trimming step) of the steel material 33. That is, when the steel material 33 is press-formed, a punch is installed in the press mold, or the press mold itself is used instead of the punch, and the rivet 11 is punched out at the same time as the press mold is lowered. As a result, the rivet 11 is caulked and fixed to the steel material 33. In this state, when the steel material 33 is transported to the resistance spot welding line, the rivet 11 is caulked and fixed to the steel material 33, so that the rivet 11 does not fall during the transfer process, and the workability of joining can be improved. ..
（抵抗スポット溶接工程）
　図５は、カラー２１を装着したリベット１１が打ち込まれた鋼材３３を、アルミニウム材３７と重ねる様子を示す工程説明図である。
　抵抗スポット溶接を行うにあたって、リベット１１が貫通して取り付けられた鋼材３３を、接合相手であるアルミニウム材３７に対してリベット１１の軸部１５の先端をアルミニウム材３７に向けて重ねて配置する。 (Resistance spot welding process)
FIG. 5 is a process explanatory view showing how the steel material 33 into which the rivet 11 with the collar 21 is driven is overlapped with the aluminum material 37.
In performing resistance spot welding, the steel material 33 to which the rivet 11 penetrates is placed so as to overlap the aluminum material 37 which is the joining partner with the tip of the shaft portion 15 of the rivet 11 facing the aluminum material 37.
　図６は、鋼材３３とアルミニウム材３７とをリベット１１を用いて抵抗スポット溶接する様子を示す工程説明図である。
　リベット１１が取り付けられた鋼材３３と、アルミニウム材３７と、を重ね合わせた板材の組を、リベット１１の位置で一対の電極４３，４５で挟み込む。そして、不図示の加圧装置によって電極４３，４５間を加圧しつつ、不図示の電源装置によって電極間に通電する（電流Ｉ）。すると、リベット１１の軸部先端面１５ａとアルミニウム材３７との間にナゲットが形成される。 FIG. 6 is a process explanatory view showing a state in which a steel material 33 and an aluminum material 37 are spot-welded by resistance using a rivet 11.
A set of a plate material obtained by superimposing a steel material 33 to which the rivet 11 is attached and an aluminum material 37 is sandwiched between a pair of electrodes 43 and 45 at the position of the rivet 11. Then, while pressurizing between the electrodes 43 and 45 by a pressurizing device (not shown), energization is performed between the electrodes by a power supply device (not shown) (current I). Then, a nugget is formed between the tip surface 15a of the shaft portion of the rivet 11 and the aluminum material 37.
　ここで、電極間に通電してナゲット４７を形成するまでの様子を詳細に説明する。
　図７は、電極間を加圧してから通電するまでの様子を（Ａ）～（Ｃ）に段階的に示す説明図である。 Here, the state until the nugget 47 is formed by energizing between the electrodes will be described in detail.
FIG. 7 is an explanatory diagram showing the state from the pressurization between the electrodes to the energization stepwise in (A) to (C).
　図７の（Ａ）に示すように、リベット１１の軸部先端面１５ａが、電極４３，４５の挟み込みによってアルミニウム材３７に押し当てられる。そして、電極４３，４５間の通電により、中心軸Ｌ付近の互いに密着した軸部先端面１５ａとアルミニウム材３７とが、通電による加熱によって溶融して、ナゲット４７が形成される。 As shown in FIG. 7A, the tip surface 15a of the shaft portion of the rivet 11 is pressed against the aluminum material 37 by sandwiching the electrodes 43 and 45. Then, by energization between the electrodes 43 and 45, the tip surface 15a of the shaft portion in close contact with each other near the central axis L and the aluminum material 37 are melted by heating by energization to form the nugget 47.
　図７の（Ｂ）に示すように、通電により形成されるナゲット４７は、中心軸Ｌを起点として成長して、溶融アルミニウムがカラー２１の内周面２３ａに達する。このとき、電極４３，４５からの加圧によってカラー２１の筒状部２３の反フランジ側端面２３ｃがアルミニウム材３７に強く押し当てられて密着される。つまり、カラー２１が環状のコロナボンドの機能を発揮して、溶融アルミニウムのはみ出しが抑制される。 As shown in FIG. 7B, the nugget 47 formed by energization grows from the central axis L as a starting point, and the molten aluminum reaches the inner peripheral surface 23a of the collar 21. At this time, due to the pressure from the electrodes 43 and 45, the anti-flange side end surface 23c of the tubular portion 23 of the collar 21 is strongly pressed against the aluminum material 37 to be brought into close contact with the aluminum material 37. That is, the collar 21 exerts the function of the annular corona bond, and the protrusion of the molten aluminum is suppressed.
　そして、図７の（Ｃ）に示すように、カラー２１に達したナゲット４７は、さらに成長を続けるが、カラー２１の筒状部２３によってナゲット４７の径方向外側への成長が堰き止められる。また、カラー２１のフランジ部２５がリベット１１の頭部裏面１３ａに密着されているので、ナゲット４７の溶融アルミニウムが、頭部裏面１３ａと鋼材３３との間から径方向外側への飛び散りも抑制される。 Then, as shown in FIG. 7 (C), the nugget 47 that has reached the collar 21 continues to grow, but the tubular portion 23 of the collar 21 blocks the growth of the nugget 47 in the radial direction. Further, since the flange portion 25 of the collar 21 is in close contact with the back surface 13a of the head of the rivet 11, the molten aluminum of the nugget 47 is suppressed from being scattered outward in the radial direction from between the back surface 13a of the head and the steel material 33. To.
　以上のようにして、軸部１５にカラー２１を取り付けたリベット１１を、鋼材３３を挟んでアルミニウム材３７と抵抗スポット溶接する際、リベット１１とアルミニウム材３７の溶融アルミニウムの広がりが、アルミニウムよりも融点の高い材質のカラー２１によって堰き止められる。これにより、リベット１１とアルミニウム材３７との接合箇所から溶融アルミニウムが外部へ流れ出すことを抑制でき、鋼材３３とアルミニウム材３７とを良好かつ高強度に接合させることができる。また、鋼材３３に対して、カラー２１によってリベット１１を傾きなく適正な姿勢で配置できるので、つまり、リベット１１の軸部１５を鋼材３３の板面法線方向に規制できるため、リベット１１とアルミニウム材３７との抵抗スポット溶接を偏りなく高精度に行うことができる。 As described above, when the rivet 11 having the collar 21 attached to the shaft portion 15 is spot-welded to the aluminum material 37 by sandwiching the steel material 33, the spread of the molten aluminum of the rivet 11 and the aluminum material 37 is larger than that of aluminum. It is blocked by the collar 21 made of a material having a high melting point. As a result, it is possible to prevent the molten aluminum from flowing out from the joint portion between the rivet 11 and the aluminum material 37, and it is possible to bond the steel material 33 and the aluminum material 37 with good and high strength. Further, since the rivet 11 can be arranged in an appropriate posture without tilting with respect to the steel material 33 by the collar 21, that is, the shaft portion 15 of the rivet 11 can be regulated in the plate surface normal direction of the steel material 33, so that the rivet 11 and aluminum can be arranged. Resistance spot welding with the material 37 can be performed with high accuracy without bias.
　また、カラー２１がリベット１１の頭部裏面１３ａに密着するフランジ部２５を有するため、リベット１１の頭部１３と鋼材３３との間からの溶融アルミニウムの流れ出しを確実に防止できる。特に、鋼製のカラー２１を用いれば、アルミニウムよりも融点が高いため、溶融アルミニウムの影響を受けにくく、しかも、耐荷重性が向上するため、強固なコロナボンドを形成でき、溶融アルミニウムを更に確実に堰き止めることができる。また、カラー２１がリベット１１と鋼材３３との間に隙間なく密着するため、異材接合体の接合強度の向上に寄与できる。 Further, since the collar 21 has the flange portion 25 in close contact with the back surface 13a of the head of the rivet 11, it is possible to reliably prevent the molten aluminum from flowing out from between the head 13 of the rivet 11 and the steel material 33. In particular, if the steel collar 21 is used, it has a higher melting point than aluminum, so that it is not easily affected by molten aluminum, and the load bearing capacity is improved, so that a strong corona bond can be formed and the molten aluminum is more reliable. Can be dammed up. Further, since the collar 21 is in close contact between the rivet 11 and the steel material 33 without a gap, it can contribute to the improvement of the bonding strength of the dissimilar material bonded body.
＜リベット固定手順の他の例＞
　上記例ではカラー２１を装着したリベット１１を鋼材３３に打ち込むことで、リベット１１を鋼材３３にかしめ固定していたが、リベット１１の鋼材３３への固定手順はこれに限らない。 <Other examples of rivet fixing procedure>
In the above example, the rivet 11 to which the collar 21 is attached is driven into the steel material 33 to crimp and fix the rivet 11 to the steel material 33, but the procedure for fixing the rivet 11 to the steel material 33 is not limited to this.
　図８は、鋼材３３にリベット１１を固定する他の手順を示す工程説明図である。
　図８に示すように、鋼材３３のリベット１１を設ける部位に、下孔となる貫通孔３４を設けておく。また、リベット１１にはカラー２１を装着しておく。この状態で、カラー２１を装着したリベット１１の軸部１５を、プレス等により貫通孔４に押し込んで貫通させ、リベット１１を鋼材３３にかしめ固定する。 FIG. 8 is a process explanatory view showing another procedure for fixing the rivet 11 to the steel material 33.
As shown in FIG. 8, a through hole 34 serving as a pilot hole is provided at a portion of the steel material 33 where the rivet 11 is provided. Further, the collar 21 is attached to the rivet 11. In this state, the shaft portion 15 of the rivet 11 to which the collar 21 is mounted is pushed into the through hole 4 by a press or the like to penetrate the rivet 11, and the rivet 11 is caulked and fixed to the steel material 33.
　この場合、リベット１１とカラー２１とを一体にして扱えるため、リベット１１及びカラー２１のハンドリング性が向上し、抵抗スポット溶接の施工性を向上できる。 In this case, since the rivet 11 and the collar 21 can be handled integrally, the handleability of the rivet 11 and the collar 21 can be improved, and the workability of resistance spot welding can be improved.
　図９は、鋼材３３にリベット１１を固定する他の手順を示す工程説明図である。
　図９に示すように、鋼材３３のリベット１１を設ける部位に下孔となる貫通孔３４を設け、この貫通孔３４にカラー２１の筒状部２３を嵌合又は接着して鋼材３３にカラー２１を装着しておく。そして、カラー２１の筒状部２３に軸部１５をプレス等により挿入して、カラー２１が装着された鋼材３３の貫通孔３４にリベット１１の軸部１５を貫通させる。これにより、リベット１１を鋼材３３にかしめ固定する。 FIG. 9 is a process explanatory view showing another procedure for fixing the rivet 11 to the steel material 33.
As shown in FIG. 9, a through hole 34 serving as a pilot hole is provided at a portion of the steel material 33 where the rivet 11 is provided, and the tubular portion 23 of the collar 21 is fitted or adhered to the through hole 34 to fit or adhere the collar 21 to the steel material 33. Is attached. Then, the shaft portion 15 is inserted into the tubular portion 23 of the collar 21 by a press or the like, and the shaft portion 15 of the rivet 11 is passed through the through hole 34 of the steel material 33 on which the collar 21 is mounted. As a result, the rivet 11 is caulked and fixed to the steel material 33.
　この場合、リベット１１を単体で鋼材３３に取り付けるため、通常のカラー２１を用いない場合と同様のリベット供給機構を利用できる。 In this case, since the rivet 11 is attached to the steel material 33 by itself, the same rivet supply mechanism as when the normal collar 21 is not used can be used.
　また、これらの他の固定手順において、リベット１１のプレスによる鋼材３３へのかしめ接合は、例えば、鋼材３３が自動車の車体構造材である場合、車体のプレス成形工程の中で実施してもよい。また、このようなプレス成形工程とは別途に、その前後の工程、例えば鋼材３３の製造工程等で実施してもよい。 Further, in these other fixing procedures, caulking joining of the rivet 11 to the steel material 33 by pressing may be performed, for example, in the press forming step of the vehicle body when the steel material 33 is a vehicle body structural material of an automobile. .. Further, apart from such a press forming process, it may be carried out in a process before and after the press forming process, for example, a manufacturing process of the steel material 33.
　カラーを介してリベットを取り付けた鋼材とアルミニウム材とを重ね合わせ、リベットとアルミニウム材とを抵抗スポット溶接した場合の接合箇所の断面を観察して評価した。
　鋼材、アルミニウム材、リベット、カラー、及び溶接条件は次の通りである。 The steel material and the aluminum material to which the rivet was attached via the collar were overlapped, and the cross section of the joint portion when the rivet and the aluminum material were spot welded by resistance was observed and evaluated.
Steel materials, aluminum materials, rivets, collars, and welding conditions are as follows.
（材料）
　　鋼材：亜鉛めっき鋼板　厚さ１．２ｍｍ
　　アルミニウム材：６０００系アルミニウム合金板　厚さ０．８ｍｍ
　　リベット：アルミニウム製、頭部直径１２ｍｍ、軸部直径８ｍｍ
　　カラー：鋼製、筒状部内径８ｍｍ、フランジ部外径１２ｍｍ、厚さ０．５ｍｍ (material)
Steel: Galvanized steel sheet 1.2 mm thick
Aluminum material: 6000 series aluminum alloy plate Thickness 0.8mm
Rivets: Aluminum, head diameter 12 mm, shaft diameter 8 mm
Color: Steel, tubular part inner diameter 8 mm, flange part outer diameter 12 mm, thickness 0.5 mm
（溶接条件）
　　溶接電流：２８～３４ｋＡ
　　通電時間：４ｃｙｃｌｅ
　　加圧力　：６．０ｋＮ (Welding conditions)
Welding current: 28-34 kA
Energizing time: 4cycle
Pressurized pressure: 6.0 kN
（評価結果）
　図１０は、接合箇所の断面写真である。
　接合箇所で生じたナゲット４７は、広い範囲に形成されてカラー２１に達していたが、接合箇所の外部には達していなかった。つまり、抵抗スポット溶接によって生じた溶融アルミニウムは、リベット１１の軸部１５と鋼材３３の貫通孔３４との間に介在されたカラー２１の筒状部２３によって堰き止められていた。また、カラー２１のフランジ部２５がリベット１１の頭部１３の頭部裏面１３ａに密着されていることから、ナゲット４７の溶融アルミニウムは、リベット１１の頭部裏面１３ａと鋼材３３との間からの流れ出しも抑制されていた。 (Evaluation results)
FIG. 10 is a cross-sectional photograph of the joint portion.
The nugget 47 generated at the joint was formed over a wide area and reached the collar 21, but did not reach the outside of the joint. That is, the molten aluminum generated by resistance spot welding was blocked by the tubular portion 23 of the collar 21 interposed between the shaft portion 15 of the rivet 11 and the through hole 34 of the steel material 33. Further, since the flange portion 25 of the collar 21 is in close contact with the head back surface 13a of the head portion 13 of the rivet 11, the molten aluminum of the nugget 47 is from between the head back surface 13a of the rivet 11 and the steel material 33. The outflow was also suppressed.
　このように、本発明は上記の実施形態に限定されるものではなく、実施形態の各構成を相互に組み合わせること、及び明細書の記載、並びに周知の技術に基づいて、当業者が変更、応用することも本発明の予定するところであり、保護を求める範囲に含まれる。 As described above, the present invention is not limited to the above-described embodiment, and is modified or applied by those skilled in the art based on the combination of each configuration of the embodiments with each other, the description of the specification, and the well-known technique. It is also a matter of the present invention to do so, and it is included in the scope of seeking protection.
　以上の通り、本明細書には次の事項が開示されている。
（１）　頭部と軸部とを有するアルミニウム製のリベットの前記軸部に、アルミニウムよりも融点の高い環状のカラーを取り付け、
　前記カラーが取り付けられた前記リベットの前記軸部を、鋼材に打ち込んで貫通させ、
　前記鋼材の前記リベットの軸部先端をアルミニウム材に対向させて、前記鋼材と前記アルミニウム材とを重ねて配置し、
　前記リベットと前記アルミニウム材とを、一対の電極で挟み込み、前記電極間で加圧しながら抵抗スポット溶接して、前記アルミニウム材と前記鋼材とを接合する、
異材接合方法。
　この異材接合方法によれば、リベットとアルミニウム材とを抵抗スポット溶接することにより、溶融したリベット及びアルミニウム材の溶融アルミニウムの広がりが、アルミニウムよりも融点の高い材質から形成されたカラーによって堰き止められる。これにより、接合箇所からの溶融アルミニウムの外部への流れ出しを抑えることができる。したがって、リベットをアルミニウム材に良好に抵抗スポット溶接して鋼材とアルミニウム材とを良好かつ高強度に接合できる。また、鋼材に対して、カラーによってリベットを傾きなく適正な姿勢で配置させることができるので、リベットとアルミニウム材との抵抗スポット溶接をナゲットの偏りをなくして、高精度に行える。 As described above, the following matters are disclosed in this specification.
(1) An annular collar having a melting point higher than that of aluminum is attached to the shaft portion of an aluminum rivet having a head and a shaft portion.
The shaft portion of the rivet to which the collar is attached is driven into a steel material and penetrated.
The tip of the shaft portion of the rivet of the steel material is opposed to the aluminum material, and the steel material and the aluminum material are placed on top of each other.
The rivet and the aluminum material are sandwiched between a pair of electrodes, and resistance spot welding is performed while pressurizing between the electrodes to join the aluminum material and the steel material.
Dissimilar material joining method.
According to this dissimilar material joining method, by spot welding the rivet and the aluminum material, the spread of the molten rivet and the molten aluminum of the aluminum material is blocked by the collar formed from the material having a melting point higher than that of aluminum. .. As a result, it is possible to suppress the outflow of the molten aluminum from the joint portion to the outside. Therefore, the rivet can be satisfactorily spot-welded to the aluminum material to join the steel material and the aluminum material with good and high strength. Further, since the rivets can be arranged in an appropriate posture without tilting with respect to the steel material, resistance spot welding between the rivets and the aluminum material can be performed with high accuracy by eliminating the bias of the nugget.
（２）　貫通孔を設けた鋼材の前記貫通孔に、頭部と軸部とを有するアルミニウム製のリベットの前記軸部を、アルミニウムよりも融点の高い環状のカラーを介して貫通させて取り付け、
　前記鋼材の前記リベットの軸部先端をアルミニウム材に対向させて、前記鋼材と前記アルミニウム材とを重ねて配置し、
　前記リベットと前記アルミニウム材とを、一対の電極で挟み込み、前記電極間で加圧しながら抵抗スポット溶接して、前記アルミニウム材と前記鋼材とを接合する、
異材接合方法。
　この異材接合方法によれば、リベットとアルミニウム材とを抵抗スポット溶接することにより、溶融したリベット及びアルミニウム材の溶融アルミニウムの広がりが、アルミニウムよりも融点の高い材質から形成されたカラーによって堰き止められる。これにより、接合箇所からの溶融アルミニウムの外部への流れ出しを抑えることができる。したがって、リベットをアルミニウム材に良好に抵抗スポット溶接して鋼材とアルミニウム材とを良好かつ高強度に接合させることができる。また、リベットを鋼材の下孔に挿入する処理を、鋼材のプレス成形工程、又はプレス成形工程とは別途に、その前後の工程等の任意のタイミングで実施できるため、工程の自由度を向上できる。 (2) The shaft portion of an aluminum rivet having a head and a shaft portion is attached to the through hole of a steel material provided with a through hole through an annular collar having a melting point higher than that of aluminum.
The tip of the shaft portion of the rivet of the steel material is opposed to the aluminum material, and the steel material and the aluminum material are placed on top of each other.
The rivet and the aluminum material are sandwiched between a pair of electrodes, and resistance spot welding is performed while pressurizing between the electrodes to join the aluminum material and the steel material.
Dissimilar material joining method.
According to this dissimilar material joining method, by spot welding the rivet and the aluminum material, the spread of the molten rivet and the molten aluminum of the aluminum material is blocked by the collar formed from the material having a melting point higher than that of aluminum. .. As a result, it is possible to suppress the outflow of the molten aluminum from the joint portion to the outside. Therefore, the rivet can be satisfactorily spot-welded to the aluminum material to bond the steel material and the aluminum material with good and high strength. Further, since the process of inserting the rivet into the prepared hole of the steel material can be performed at an arbitrary timing such as a process before and after the press forming process of the steel material or a process before and after the press forming process, the degree of freedom of the process can be improved. ..
（３）　前記カラーを装着させた前記リベットの前記軸部を、前記鋼材の前記貫通孔に嵌合させて、前記リベットを前記鋼材に取り付ける、（２）に記載の異材接合方法。
　この異材接合方法によれば、カラーを装着したリベットを鋼材へ容易に取り付けでき、施工性を向上できる。 (3) The dissimilar material joining method according to (2), wherein the shaft portion of the rivet to which the collar is attached is fitted into the through hole of the steel material, and the rivet is attached to the steel material.
According to this dissimilar material joining method, the rivet with the collar attached can be easily attached to the steel material, and the workability can be improved.
（４）　前記鋼材の前記貫通孔に前記カラーを嵌合させ、前記貫通孔に嵌合した前記カラーの内周面に前記軸部を貫通させて、前記リベットを前記鋼材に取り付ける、（２）に記載の異材接合方法。
　この異材接合方法によれば、鋼材の下孔にカラーを嵌合させておくことで、リベットの扱いが簡単となり、施工性を向上できる。 (4) The collar is fitted into the through hole of the steel material, the shaft portion is passed through the inner peripheral surface of the collar fitted in the through hole, and the rivet is attached to the steel material (2). Dissimilar material joining method described in.
According to this dissimilar material joining method, by fitting the collar into the prepared hole of the steel material, the rivet can be easily handled and the workability can be improved.
（５）　前記カラーは、前記リベットの軸部と前記鋼材との間に配置される筒状部と、前記リベットの頭部と前記鋼材との間に配置されるフランジ部と、が一体に形成されている、（１）～（４）のいずれか一つに記載の異材接合方法。
　この異材接合方法によれば、カラーの筒状部によって溶融アルミニウムを良好に堰き止めることができ、また、筒状部と一体となったフランジ部によって、リベットの頭部と鋼材との間から溶融アルミニウムが流れ出すことを抑制できる。 (5) The collar is integrally formed with a tubular portion arranged between the shaft portion of the rivet and the steel material and a flange portion arranged between the head portion of the rivet and the steel material. The dissimilar material joining method according to any one of (1) to (4).
According to this dissimilar material joining method, the molten aluminum can be well blocked by the tubular portion of the collar, and the flange portion integrated with the tubular portion melts from between the head of the rivet and the steel material. It is possible to prevent aluminum from flowing out.
（６）　前記カラーは鋼製である、（１）～（５）のいずれか一つに記載の異材接合方法。
　この異材接合方法によれば、アルミニウムよりも融点が高いため、溶融アルミニウムの影響を受けにくく、しかも、耐荷重性が向上するため、強固なコロナボンドを形成でき、溶融アルミニウムを更に確実に堰き止めることができる。 (6) The dissimilar material joining method according to any one of (1) to (5), wherein the collar is made of steel.
According to this dissimilar material joining method, since the melting point is higher than that of aluminum, it is not easily affected by molten aluminum, and the load bearing capacity is improved, so that a strong corona bond can be formed and the molten aluminum is more reliably dammed. be able to.
（７）　互いに重ね合わされた鋼材とアルミニウム材とが、軸部と頭部を有するアルミニウム製のリベットで接合された異材接合体であって、
　前記鋼材と前記リベットとの間に、アルミニウムよりも融点の高い環状のカラーが配置され、
　前記カラーの内径側に、前記リベットと前記アルミニウム材とが溶融、凝固したナゲットが形成されている、
異材接合体。
　この異材接合体によれば、溶融したリベット及びアルミニウム材の溶融アルミニウムの広がりが、カラーによって堰き止められ、接合箇所からの溶融アルミニウムの外部への流れ出し（チリ）を抑えた構成にできる。したがって、鋼材とアルミニウム材とを高強度に接合できる。 (7) The steel material and the aluminum material superposed on each other are dissimilar material joints joined by aluminum rivets having a shaft portion and a head.
An annular collar having a melting point higher than that of aluminum is placed between the steel material and the rivet.
A nugget in which the rivet and the aluminum material are melted and solidified is formed on the inner diameter side of the collar.
Dissimilar material joint.
According to this dissimilar material joint, the spread of the molten aluminum of the molten rivet and the aluminum material is blocked by the collar, and the molten aluminum can be prevented from flowing out (dust) from the joint portion to the outside. Therefore, the steel material and the aluminum material can be joined with high strength.
（８）　前記カラーは、前記リベットの軸部と前記鋼材との間に配置される筒状部と、前記リベットの頭部と前記鋼材との間に配置されるフランジ部と、が一体に形成されている、（７）に記載の異材接合体。
　この異材接合体によれば、リベットと鋼材との間が隙間なくカラーで覆われるため、密着性が向上して、リベットと鋼材との接合が良好となる。 (8) The collar is integrally formed with a tubular portion arranged between the shaft portion of the rivet and the steel material and a flange portion arranged between the head portion of the rivet and the steel material. The dissimilar material joint according to (7).
According to this dissimilar material joint, since the space between the rivet and the steel material is covered with the collar without a gap, the adhesion is improved and the joint between the rivet and the steel material is good.
（９）　前記カラーは鋼製である、（７）又は（８）に記載の異材接合体。
　この異材接合体によれば、鋼製のカラーによって耐荷重性が向上し、接合強度をより向上できる。 (9) The dissimilar material joint according to (7) or (8), wherein the collar is made of steel.
According to this dissimilar material joint, the load bearing capacity is improved by the steel collar, and the joint strength can be further improved.
　本出願は、２０２０年９月７日出願の日本特許出願（特願２０２０－１５００４９）に基づくものであり、その内容は本出願の中に参照として援用される。 This application is based on a Japanese patent application filed on September 7, 2020 (Japanese Patent Application No. 2020-150049), the contents of which are incorporated herein by reference.
　１１　リベット
　１３　頭部
　１５　軸部
　２１　カラー
　２３　筒状部
　２５　フランジ部
　３３　鋼材
　３４　貫通孔
　３７　アルミニウム材
　４３，４５　電極 11 Rivet 13 Head 15 Shaft 21 Color 23 Cylindrical 25 Flange 33 Steel 34 Through hole 37 Aluminum 43,45 Electrode

Claims (10)

  1. 　頭部と軸部とを有するアルミニウム製のリベットの前記軸部に、アルミニウムよりも融点の高い環状のカラーを取り付け、
    　前記カラーが取り付けられた前記リベットの前記軸部を、鋼材に打ち込んで貫通させ、
    　前記鋼材の前記リベットの軸部先端をアルミニウム材に対向させて、前記鋼材と前記アルミニウム材とを重ねて配置し、
    　前記リベットと前記アルミニウム材とを、一対の電極で挟み込み、前記電極間で加圧しながら抵抗スポット溶接して、前記アルミニウム材と前記鋼材とを接合する、
    異材接合方法。     An annular collar with a higher melting point than aluminum is attached to the shaft of an aluminum rivet having a head and a shaft.
    The shaft portion of the rivet to which the collar is attached is driven into a steel material and penetrated.
    The tip of the shaft portion of the rivet of the steel material is opposed to the aluminum material, and the steel material and the aluminum material are placed on top of each other.
    The rivet and the aluminum material are sandwiched between a pair of electrodes, and resistance spot welding is performed while pressurizing between the electrodes to join the aluminum material and the steel material.
    Dissimilar material joining method.
  2. 　貫通孔を設けた鋼材の前記貫通孔に、頭部と軸部とを有するアルミニウム製のリベットの前記軸部を、アルミニウムよりも融点の高い環状のカラーを介して貫通させて取り付け、
    　前記鋼材の前記リベットの軸部先端をアルミニウム材に対向させて、前記鋼材と前記アルミニウム材とを重ねて配置し、
    　前記リベットと前記アルミニウム材とを、一対の電極で挟み込み、前記電極間で加圧しながら抵抗スポット溶接して、前記アルミニウム材と前記鋼材とを接合する、
    異材接合方法。     The shaft portion of an aluminum rivet having a head and a shaft portion is attached to the through hole of a steel material provided with a through hole by penetrating the shaft portion through an annular collar having a melting point higher than that of aluminum.
    The tip of the shaft portion of the rivet of the steel material is opposed to the aluminum material, and the steel material and the aluminum material are placed on top of each other.
    The rivet and the aluminum material are sandwiched between a pair of electrodes, and resistance spot welding is performed while pressurizing between the electrodes to join the aluminum material and the steel material.
    Dissimilar material joining method.
  3. 　前記カラーを装着させた前記リベットの前記軸部を、前記鋼材の前記貫通孔に嵌合させて、前記リベットを前記鋼材に取り付ける、請求項２に記載の異材接合方法。 The dissimilar material joining method according to claim 2, wherein the shaft portion of the rivet to which the collar is attached is fitted into the through hole of the steel material, and the rivet is attached to the steel material.
  4. 　前記鋼材の前記貫通孔に前記カラーを嵌合させ、前記貫通孔に嵌合した前記カラーの内周面に前記軸部を貫通させて、前記リベットを前記鋼材に取り付ける、請求項２に記載の異材接合方法。 The second aspect of the present invention, wherein the collar is fitted into the through hole of the steel material, the shaft portion is passed through the inner peripheral surface of the collar fitted in the through hole, and the rivet is attached to the steel material. Dissimilar material joining method.
  5. 　前記カラーは、前記リベットの軸部と前記鋼材との間に配置される筒状部と、前記リベットの頭部と前記鋼材との間に配置されるフランジ部と、が一体に形成されている、請求項１～４のいずれか一項に記載の異材接合方法。 The collar is integrally formed with a tubular portion arranged between the shaft portion of the rivet and the steel material, and a flange portion arranged between the head portion of the rivet and the steel material. , The dissimilar material joining method according to any one of claims 1 to 4.
  6. 　前記カラーは鋼製である、請求項１～４のいずれか一項に記載の異材接合方法。 The dissimilar material joining method according to any one of claims 1 to 4, wherein the collar is made of steel.
  7. 　前記カラーは鋼製である、請求項５に記載の異材接合方法。 The dissimilar material joining method according to claim 5, wherein the collar is made of steel.
  8. 　互いに重ね合わされた鋼材とアルミニウム材とが、軸部と頭部を有するアルミニウム製のリベットで接合された異材接合体であって、
    　前記鋼材と前記リベットとの間に、アルミニウムよりも融点の高い環状のカラーが配置され、
    　前記カラーの内径側に、前記リベットと前記アルミニウム材とが溶融、凝固したナゲットが形成されている、
    異材接合体。     The steel material and the aluminum material that are overlapped with each other are dissimilar material joints that are joined by aluminum rivets having a shaft portion and a head.
    An annular collar having a melting point higher than that of aluminum is placed between the steel material and the rivet.
    A nugget in which the rivet and the aluminum material are melted and solidified is formed on the inner diameter side of the collar.
    Dissimilar material joint.
  9. 　前記カラーは、前記リベットの軸部と前記鋼材との間に配置される筒状部と、前記リベットの頭部と前記鋼材との間に配置されるフランジ部と、が一体に形成されている、請求項８に記載の異材接合体。 The collar is integrally formed with a tubular portion arranged between the shaft portion of the rivet and the steel material, and a flange portion arranged between the head portion of the rivet and the steel material. , The dissimilar material joint according to claim 8.
  10. 　前記カラーは鋼製である、請求項８又は９に記載の異材接合体。 The dissimilar material joint according to claim 8 or 9, wherein the collar is made of steel.
PCT/JP2021/030270 2020-09-07 2021-08-18 Method for joining dissimilar materials, and dissimilar-material joined body WO2022050054A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020172576A1 (en) * 2001-05-18 2002-11-21 The Boeing Company Fastener apparatus and method of fastening non-metallic structures
JP2010207898A (en) * 2009-03-11 2010-09-24 Kobe Steel Ltd Rivet for joining different material, method for joining different material, and joined body of different material
JP2018079476A (en) * 2016-11-14 2018-05-24 株式会社神戸製鋼所 Joint structure and manufacturing method of the same
JP2018171658A (en) * 2014-02-03 2018-11-08 アーコニック インコーポレイテッドＡｒｃｏｎｉｃ Ｉｎｃ． Resistance welding fastener, apparatus, and method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020172576A1 (en) * 2001-05-18 2002-11-21 The Boeing Company Fastener apparatus and method of fastening non-metallic structures
JP2010207898A (en) * 2009-03-11 2010-09-24 Kobe Steel Ltd Rivet for joining different material, method for joining different material, and joined body of different material
JP2018171658A (en) * 2014-02-03 2018-11-08 アーコニック インコーポレイテッドＡｒｃｏｎｉｃ Ｉｎｃ． Resistance welding fastener, apparatus, and method
JP2018079476A (en) * 2016-11-14 2018-05-24 株式会社神戸製鋼所 Joint structure and manufacturing method of the same

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