JP5055104B2 - Self-piercing rivet joining method and rivet joining die - Google Patents

Self-piercing rivet joining method and rivet joining die Download PDF

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JP5055104B2
JP5055104B2 JP2007325960A JP2007325960A JP5055104B2 JP 5055104 B2 JP5055104 B2 JP 5055104B2 JP 2007325960 A JP2007325960 A JP 2007325960A JP 2007325960 A JP2007325960 A JP 2007325960A JP 5055104 B2 JP5055104 B2 JP 5055104B2
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self
joined
die
piercing rivet
piercing
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JP2009142889A (en
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孝 松岡
亨 加藤
智康 平井
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Nissan Motor Co Ltd
Nippon Pop Rivets and Fasteners Ltd
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Nissan Motor Co Ltd
Nippon Pop Rivets and Fasteners Ltd
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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
    • B21J15/02—Riveting procedures
    • B21J15/025—Setting self-piercing rivets
    • 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
    • B21J15/10—Riveting machines
    • B21J15/36—Rivet sets, i.e. tools for forming heads; Mandrels for expanding parts of hollow rivets

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Insertion Pins And Rivets (AREA)
  • Connection Of Plates (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joining method using a self-piercing rivet, which can prevent cracking of a die and overload on a rivet driving-in device by reducing the rivet driving-in load. <P>SOLUTION: Three plates, a top plate W1, a middle plate W2 and a bottom plate W3, are piled up together. Those plates W1, W2 and W3 are pressurized and restricted with the die 1 and a pad 2 and then fastened and joined to the top plate W1 with a punch 6 by driving-in the self-piercing rivet 3. The die 1 has a concave pressurize-restricting face 4 with a projection at the center, and the driving-in operation of the self-piercing rivet 3 is completed before a swelled portion P on the bottom plate W3 side comes to contact to the deepest part of the pressurize-restricting face 4. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

本発明は、セルフピアスリベットによる接合方法とその接合方法に用いるリベット接合用ダイに関し、特にアルミニウム合金板と高張力鋼板（超高張力鋼板を含む）とのセルフピアスリベット継手構造に好適な接合方法と接合用ダイの改良に関するものである。   The present invention relates to a joining method using a self-piercing rivet and a rivet joining die used for the joining method, and more particularly to a joining method suitable for a self-piercing rivet joint structure of an aluminum alloy plate and a high-tensile steel plate (including a super-high-strength steel plate). And improvement of the joining die.

この種のセルフピアスリベットによる接合方法は特許文献１等にて広く知られており、特に自動車に多用される傾向にあるアルミニウム合金板と高張力鋼板または超高張力鋼板とのセルフピアスリベット接合を考慮した技術が非特許文献１，２で提案されている。   This type of joining method using self-piercing rivets is widely known in Patent Document 1 and the like, and in particular, self-piercing rivet joining between an aluminum alloy plate and a high-tensile steel plate or an ultra-high-strength steel plate, which tends to be frequently used in automobiles. Non-Patent Documents 1 and 2 propose techniques that have been taken into consideration.

非特許文献１，２では、アルミニウム合金板と高張力鋼板（超高張力鋼板を含む）とのセルフピアスリベット接合において、下板側をアルミニウム合金板とした場合（非特許文献１）および下板側を高張力鋼板とした場合（非特許文献２）のいずれにおいても、ダイ側の凹部の傾斜の度合いやその凹部中央部の突出高さ等を適宜調整することで、板材側の割れあるいはリベットの座屈といった接合不良をある程度未然に防止することができるとされている。
特開２００６−４３７６９号公報 平成１７年度 塑性加工春季講演会（２００５．５．２５〜２７ 三条市），講演論文集Ｐ１０７〜１０８，「セルフピアシングリベットによるアルミニウム合金板と高張力鋼板の接合」，日本塑性加工学会 第５６回塑性加工連合講演会（２００５．１１．１８〜２０ 沖縄市・沖縄県中頭郡），講演論文集Ｐ５５３〜５５４，「セルフピアシングリベットよるアルミニウム合金板と高張力鋼板の接合（第２報：上板アルミ合金板と下板高張力鋼板）」，日本塑性加工学会 In Non-Patent Documents 1 and 2, when self-piercing rivet joining of an aluminum alloy plate and a high-tensile steel plate (including an ultra-high-strength steel plate), the lower plate side is an aluminum alloy plate (Non-Patent Document 1) and the lower plate In any case where the side is a high-strength steel plate (Non-patent Document 2), by appropriately adjusting the degree of inclination of the concave portion on the die side, the protruding height of the central portion of the concave portion, etc., cracks or rivets on the plate material side It is said that joint failure such as buckling can be prevented to some extent.
JP 2006-43769 A 2005 Plastic Working Spring Lecture (2005.5.525-27 Sanjo City), Proceedings P107-108, “Jointing of Aluminum Alloy Plate and High Tensile Strength Steel Plate with Self-piercing Rivet”, Japan Society for Technology of Plasticity 56th Plastic Working Joint Lecture Meeting (2005.11.18-20, Okinawa, Nakagami-gun, Okinawa Prefecture), Proceedings P553-554, "Joint of Aluminum Alloy Plate and High Tensile Strength Steel Plate by Self-piercing Rivet (2nd Report) : Upper plate aluminum alloy plate and lower plate high-tensile steel plate) ”, Japan Society for Technology of Plasticity

非特許文献２に記載の下板側を高張力鋼板とした場合の例では、割れ発生や接合可能板厚の予測・評価は、あくまで板材が１枚モデルでのシミュレーション結果にすぎないために、特に上板の影響が十分に考慮されておらず、実際にセルフピアスリベットの打ち込みを行うと、リベット打ち込み荷重が高いために、ダイの割れのほか、リベット打ち込み装置の過負荷による装置異常が発生するという問題がある。   In the example when the lower plate side described in Non-Patent Document 2 is a high-tensile steel plate, the prediction and evaluation of crack occurrence and bondable plate thickness is only a simulation result with a single plate model, In particular, the influence of the upper plate is not fully taken into account, and when the self-piercing rivet is actually driven, the rivet driving load is high, resulting in equipment failure due to die cracking and overloading of the rivet driving device. There is a problem of doing.

特にセルフピアスリベットの場合には、サーボモータを駆動源としてボールねじによりパンチを昇降動作させるタイプのリベット打ち込み装置が使用されるために、上記のような装置異常が発生しやすい。   In particular, in the case of a self-piercing rivet, a rivet driving device of a type in which a punch is moved up and down by a ball screw using a servo motor as a drive source is used, and thus the above-described device abnormality is likely to occur.

本発明はこのような課題に着目してなされたものであり、とりわけリベット打ち込み荷重を低減でき、さらにはダイの割れ、装置の過負荷を未然に防止できるようにしたセルフピアスリベットによる接合方法とその方法に好適なリベット接合用ダイを提供しようとするものである。   The present invention has been made paying attention to such a problem, and in particular, a bonding method using a self-piercing rivet that can reduce the rivet driving load and further prevent the cracking of the die and the overload of the apparatus. An object of the present invention is to provide a rivet joining die suitable for the method.

請求項１に記載の発明は、複数の板状の被接合部材同士を重ね合わせてそれら複数の被接合部材の一方の面にダイを当接させるとともに、複数の被接合部材の他方の面にダイ側に向けて円環状の軸部を有するセルフピアスリベットを打ち込むことにより複数の被接合部材同士をリベット接合する方法であることを前提としている。その上で、上記ダイは中央部が突出した凹状の加圧拘束面を有していて、この加圧拘束面のうち当該加圧拘束面の最深部を含み且つセルフピアスリベットの少なくとも軸部の投影形状と合致する部分に被接合部材が接触する前にセルフピアスリベットの打ち込みを完了させることを特徴とする。
この場合において、セルフピアスリベットとしては、例えば請求項６に記載のように、ボロン鋼等の鋼系材料製のものとする。 According to the first aspect of the present invention, a plurality of plate-like members to be joined are overlapped with each other and a die is brought into contact with one surface of the plurality of members to be joined, and the other surface of the plurality of members to be joined is contacted. It is premised on a method of riveting a plurality of members to be joined by driving a self-piercing rivet having an annular shaft portion toward the die side. In addition, the die has a concave pressure constraining surface protruding from the center, and includes the deepest portion of the pressure constraining surface of the pressure constraining surface and at least the shaft portion of the self-piercing rivet. It is characterized in that the driving of the self-piercing rivet is completed before the member to be joined comes into contact with the portion that matches the projected shape .
In this case, the self-piercing rivet is made of a steel material such as boron steel, as described in claim 6, for example.

また請求項７に記載の発明は、上記請求項１に記載の技術を当該セルフピアスリベットによる接合方法に用いるダイとして捉えたものであって、上記ダイの加圧拘束面のうち当該加圧拘束面の最深部を含み且つセルフピアスリベットの少なくとも軸部の投影形状と合致する部分に被接合部材が接触する前にセルフピアスリベットの打ち込みが完了するように、少なくもとも上記加圧拘束面の深さおよび中央部の突出高さ位置をそれぞれ設定してあることを特徴とする。 The invention described in claim 7, the billing technique described in claim 1 comprising which is assumed as a die for use in the bonding method according to the self-piercing rivet, the pressure constraints of the pressure restraining face of the die At least the pressure restraint surface so that the driving of the self-piercing rivet is completed before the member to be joined comes into contact with the portion including the deepest part of the surface and matching the projected shape of at least the shaft portion of the self-piercing rivet. The depth and the protruding height position of the central part are respectively set.

したがって、これらの請求項１，７に記載の発明では、ダイの加圧拘束面のうち当該加圧拘束面の最深部を含み且つセルフピアスリベットの少なくとも軸部の投影形状と合致する部分に被接合部材が接触する前にセルフピアスリベットの打ち込みを完了させることは、リベット打ち込み完了時点においてダイの加圧拘束面の全面が被接合部材に接触しないことにほかならないから、それによってリベット打ち込み荷重を低減、ひいてはダイの割れや装置の過負荷を未然に防止できることになる。 Therefore, in the inventions according to the first and seventh aspects of the present invention, the portion of the pressure restraint surface of the die that includes the deepest portion of the pressure restraint surface and that matches the projected shape of at least the shaft portion of the self-piercing rivet is covered. Completing the driving of the self-piercing rivet before contacting the joining member means that the entire pressure restraint surface of the die does not contact the member to be joined at the time when the rivet driving is completed. Reduction, and consequently, cracking of the die and overload of the device can be prevented in advance.

請求項１，７に記載の発明によれば、被接合部材がアルミニウム合金板と高張力鋼板との組み合わせの場合であっても、リベット打ち込み荷重を低減でき、ダイの割れや装置の過負荷を未然に防止できるほか、特にダイに直接当接する被接合部材の過大な変形を抑制して、その被接合部材側での割れの発生をも未然に防止できるようになる。
According to the first and seventh aspects of the invention, even when the member to be joined is a combination of an aluminum alloy plate and a high-tensile steel plate, the rivet driving load can be reduced, and die cracking and overloading of the device can be prevented. In addition to being able to prevent it, it is possible to prevent the occurrence of cracks on the bonded member side by suppressing excessive deformation of the bonded member that is in direct contact with the die.

図１は本発明に係るセルフピアスリベット接合方法のより具体的な実施の形態を示す図で、被接合部材として上板Ｗ１、中板Ｗ２および下板Ｗ３の三枚の板組みで締結接合する場合の例を示している。なお、ここでは上板Ｗ１をアルミニウム合金板、中板Ｗ２を軟鋼板、下板Ｗ３を高張力鋼板とする。   FIG. 1 is a diagram showing a more specific embodiment of the self-piercing rivet joining method according to the present invention, and is fastened and joined by three plate assemblies of an upper plate W1, an intermediate plate W2 and a lower plate W3 as members to be joined. An example of the case is shown. Here, the upper plate W1 is an aluminum alloy plate, the middle plate W2 is a mild steel plate, and the lower plate W3 is a high-tensile steel plate.

図１の（Ａ）に示すように、上板Ｗ１と中板Ｗ２および下板Ｗ３の三枚の板材を重ね合わせてダイ１の上に位置決めし、ダイ１と対向配置されたパッド２を下降させてそのパッド２にて板材Ｗ１〜Ｗ３を加圧拘束するとともに、上板Ｗ１側からセルフピアスリベット３を供給して位置決めする。   As shown in FIG. 1A, the three plates of the upper plate W1, the middle plate W2 and the lower plate W3 are overlapped and positioned on the die 1, and the pad 2 disposed opposite to the die 1 is lowered. Then, the plate members W1 to W3 are pressed and restrained by the pad 2, and the self-piercing rivet 3 is supplied and positioned from the upper plate W1 side.

なお、セルフピアスリベット３はフルチューブラリベットに類似した形状ではあるものの、その特殊性として軸部３ｂの長さが極端に短いものとなっている。   Although the self-piercing rivet 3 has a shape similar to that of a full tubular rivet, as a special feature, the length of the shaft portion 3b is extremely short.

ダイ１には打ち込むべきセルフピアスリベット３の大きさに応じた皿状または凹状の加圧拘束面４が形成されていて、その中央部に略円錐形状の突出部５が形成されているために加圧拘束面４全体としては円環状のものとなっている。そして、突出部５の頂部はダイ１そのものの上面とほぼ同一高さ、例えば突出部５の頂部はダイ１そのものの上面と同一高さ位置とするか、または図２に示すように突出部５の頂部５ａはダイ１の上面よりもわずかに低くなるように設定してあるとともに、突出部５の根元部側は滑らかな円弧状面をもって加圧拘束面４の底面に連続している。   The die 1 is formed with a dish-like or concave pressurizing restraint surface 4 corresponding to the size of the self-piercing rivet 3 to be driven, and a substantially conical projection 5 is formed at the center thereof. The entire pressure restraint surface 4 is annular. The top of the protrusion 5 is substantially the same height as the upper surface of the die 1 itself, for example, the top of the protrusion 5 is at the same height as the upper surface of the die 1 itself, or as shown in FIG. The top 5a is set to be slightly lower than the top surface of the die 1, and the base side of the protrusion 5 is continuous with the bottom surface of the pressure restraining surface 4 with a smooth arcuate surface.

したがって、図１の（Ａ）から明らかなように、ダイ１にて三枚の板材Ｗ１〜Ｗ３を支えたときには、ダイ１側の突出部５の頂部はダイ１の上面とともに下板Ｗ３に接するか、あるいは接しないまでも下板Ｗ３ときわめて近接した状態となる。   Therefore, as apparent from FIG. 1A, when the three plate members W1 to W3 are supported by the die 1, the top of the protruding portion 5 on the die 1 side contacts the lower plate W3 together with the upper surface of the die 1. Even if it is not in contact with the lower plate W3, it is in a very close state.

続いて、図１の（Ｂ）に示すように、パッド２とともにダイ１と対向配置されたパンチ６を下降させてセルフピアスリベット３を上板Ｗ１側から打ち込む。セルフピアスリベット３は名のとおり自己穿孔方式にて板材Ｗ１〜Ｗ３に打ち込まれ、その打ち込み進行に伴い板材Ｗ１〜Ｗ３の一部がダイ１側の加圧拘束面４側に向けて膨出するように塑性変形することになる。そして、同図（Ｃ）に示すように、最終的にはセルフピアスリベット３は上板Ｗ１と中板Ｗ２は貫通するも下板Ｗ３は貫通せず、軸部３ｂの先端が外側に拡がりながら下板Ｗ３に食い込み、頭部３ａが上板ｗ１とほぼ面一となる状態をもってリベット継手としての締結、すなわちセルフピアスリベット３による板材Ｗ１〜Ｗ３同士の締結接合が完了する。   Subsequently, as shown in FIG. 1B, the punch 6 disposed facing the die 1 together with the pad 2 is lowered and the self-piercing rivet 3 is driven from the upper plate W1 side. As the name suggests, the self-piercing rivet 3 is driven into the plate materials W1 to W3 by a self-drilling method, and a part of the plate materials W1 to W3 bulges toward the pressure restraint surface 4 side on the die 1 side as the driving progresses. It will be plastically deformed. As shown in FIG. 5C, the self-piercing rivet 3 eventually penetrates the upper plate W1 and the middle plate W2, but does not penetrate the lower plate W3, and the tip of the shaft portion 3b spreads outward. The lower plate W3 bites into the lower plate W3 and the head 3a is substantially flush with the upper plate w1. Thus, fastening as a rivet joint, that is, fastening of the plate materials W1 to W3 by the self-piercing rivet 3 is completed.

ここで、図１の（Ｃ）の状態をもってセルフピアスリベット３による締結が完了することは先に述べたとおりであるが、ここで重要なことは同図の状態をもってしてもなおも下板Ｗ３側の膨出部Ｐがダイ１側の加圧拘束面４の底面、特にその最深部には接触せず、下板Ｗ３側の膨出部Ｐとダイ１側の加圧拘束面４との間に隙間Ｇが確保されていることである。これは、ダイ１が板材Ｗ１〜Ｗ３に及ぼす加圧拘束力はダイ１の上面のほか突出部５の頂部に集中していることを意味し、同図（Ｂ），（Ｃ）から明らかなようにセルフピアスリベット３の打ち込みに伴い下板Ｗ３がダイ１側に膨出して膨出部Ｐとして成長する過程では、その膨出部Ｐがダイ１によっては何ら拘束されることなくその塑性変形が進行することになる。これにより、リベット打ち込み荷重が過大になりすぎるのを未然に防止することができ、ダイ１の割れ発生防止に大きく貢献することができる。   Here, as described above, the fastening by the self-piercing rivet 3 is completed in the state shown in FIG. 1C. However, what is important here is that the lower plate still has the state shown in FIG. The bulging portion P on the W3 side does not contact the bottom surface of the pressure restraining surface 4 on the die 1 side, particularly the deepest portion thereof, and the bulging portion P on the lower plate W3 side and the pressure restraining surface 4 on the die 1 side That is, the gap G is secured. This means that the pressing restraining force exerted on the plate members W1 to W3 by the die 1 is concentrated on the top of the protruding portion 5 in addition to the upper surface of the die 1, which is apparent from FIGS. Thus, in the process in which the lower plate W3 bulges toward the die 1 side and grows as the bulge portion P as the self-piercing rivet 3 is driven, the bulge portion P is plastically deformed without being constrained by the die 1. Will progress. Thereby, it is possible to prevent the rivet driving load from becoming excessively large, and can greatly contribute to the prevention of cracking of the die 1.

さらに、上記のように膨出部Ｐがダイ１によっては何ら拘束されることなくその塑性変形が進行することは、下板Ｗ３の過大な変形を抑制して、その下板Ｗ３の割れを未然に防止する上でも有利となる。言い換えるならば、下板Ｗ３のうちセルフピアスリベット３の打ち込みに関与する部分が突出部５で支持されているだけであるので、セルフピアスリベット３が下板Ｗ３に食い込みやすく、セルフピアスリベット３の座屈等を招くこともないから、必要十分な接合強度を確保することができる。   Further, as described above, the plastic deformation progresses without the bulging portion P being restrained by the die 1, which suppresses excessive deformation of the lower plate W3 and causes the lower plate W3 to crack. This is also advantageous for prevention. In other words, since the portion of the lower plate W3 that is involved in driving the self-piercing rivet 3 is only supported by the protrusion 5, the self-piercing rivet 3 is easy to bite into the lower plate W3, and the self-piercing rivet 3 Since it does not cause buckling or the like, a necessary and sufficient bonding strength can be ensured.

ここで、図１に示した接合方法を前提としたより具体的な実施例について説明する。   Here, a more specific embodiment based on the joining method shown in FIG. 1 will be described.

上板Ｗ１には板厚が１．２ｍｍの６０００系アルミニウム合金板を、中板Ｗ２には板厚が０．８ｍｍの軟鋼板を、下板Ｗ３には板厚が１．８ｍｍの高張力鋼板をそれぞれ用い、図１と同様の三枚の板組みでセルフピアスリベット３による締結接合を行った。なお、高張力鋼板の引っ張り強度は５９０ＭＰａ、加工硬化指数は０．１以上、一様伸びは８％以上である。また、セルフピアスリベット３はボロン鋼製のものであり、その軸部３ｂの直径（φ）は５．３ｍｍ、長さは５ｍｍ、硬度は４８０Ｈｖとした。また、ダイ１の加圧拘束面４の形状は図２に示したとおりであり、特に突出部５の頂部５ａの高さ位置はダイ１の上面よりも所定量αだけ低く設定した。   The upper plate W1 is a 6000 series aluminum alloy plate having a thickness of 1.2 mm, the middle plate W2 is a mild steel plate having a thickness of 0.8 mm, and the lower plate W3 is a high-tensile steel plate having a thickness of 1.8 mm. Each was used to fasten and join with a self-piercing rivet 3 using the same three-plate assembly as in FIG. The tensile strength of the high-tensile steel plate is 590 MPa, the work hardening index is 0.1 or more, and the uniform elongation is 8% or more. The self-piercing rivet 3 is made of boron steel, and the diameter (φ) of the shaft portion 3b is 5.3 mm, the length is 5 mm, and the hardness is 480 Hv. Further, the shape of the pressure restraint surface 4 of the die 1 is as shown in FIG. 2, and in particular, the height position of the top portion 5 a of the protruding portion 5 is set lower than the upper surface of the die 1 by a predetermined amount α.

さらに、下板Ｗ３として上記高張力鋼板に代えて板厚が２．０ｍｍで引っ張り強度が９８０ＭＰａの超高張力鋼板を用い、それ以外は上記と同条件でセルフピアスリベット３による締結接合を行った。   Furthermore, instead of the high-strength steel plate as the lower plate W3, an ultra-high-strength steel plate having a thickness of 2.0 mm and a tensile strength of 980 MPa was used, and other than that, fastening joining with the self-piercing rivet 3 was performed under the same conditions as above. .

これらのいずれの場合にも、ダイ１の割れや下板Ｗ３の割れ、あるいはセルフピアスリベット３の座屈等の不具合の発生がなく、必要十分なリベット接合強度が得られることが確認できた。また、いずれの場合にもダイ１の割れのほか、リベット打ち込み装置の過負荷あるいはそれによる装置停止等の異常の発生は認められず、リベット打ち込み荷重は約６５ｋＮであった。   In any of these cases, it was confirmed that there was no problem such as cracking of the die 1, cracking of the lower plate W3, or buckling of the self-piercing rivet 3, and the necessary and sufficient rivet joint strength was obtained. Further, in any case, in addition to cracking of the die 1, there was no occurrence of an abnormality such as an overload of the rivet driving device or an apparatus stop due thereto, and the rivet driving load was about 65 kN.

比較のために、図３に示すように加圧拘束面４における中央部の突出部５の頂部高さをダイ１の上面よりも低くしたダイ１を用い、加圧拘束面４の全面が下板Ｗ３に圧接した状態でセルフピアスリベット３の締結接合が完了するように、そのセルフピアスリベット３の打ち込みを行ってみた。このときのリベット打ち込み荷重は約８０ｋＮであった。   For comparison, as shown in FIG. 3, a die 1 is used in which the top height of the central protruding portion 5 of the pressure restraint surface 4 is lower than the upper surface of the die 1, and the entire surface of the pressure restraint surface 4 is lower. The self-piercing rivet 3 was driven so that the fastening and joining of the self-piercing rivet 3 was completed in a state where it was pressed against the plate W3. The rivet driving load at this time was about 80 kN.

以上のことから、図１の（Ｃ）の状態をもってセルフピアスリベット３による締結接合が完了した時点で、下板Ｗ３側の膨出部Ｐがダイ１側の加圧拘束面４の最深部には接触せず、下板Ｗ３側の膨出部Ｐとダイ１側の加圧拘束面４との間に隙間Ｇが確保されていることは、特にリベット打ち込み荷重の低減に大きく寄与できることがわかる。   From the above, when the fastening joining by the self-piercing rivet 3 is completed in the state of FIG. 1C, the bulging portion P on the lower plate W3 side is at the deepest portion of the pressure restraining surface 4 on the die 1 side. Is not in contact, and the gap G is secured between the bulging portion P on the lower plate W3 side and the pressure restraining surface 4 on the die 1 side, it can be seen that this can greatly contribute particularly to the reduction of the rivet driving load. .

本発明に係るセルフピアスリベット接合方法の具体的な実施の形態としてその手順を示す工程説明図。Process explanatory drawing which shows the procedure as concrete embodiment of the self-piercing rivet joining method which concerns on this invention. 図１のセルフピアスリベット接合方法で使用するダイの諸元を示す要部拡大図。The principal part enlarged view which shows the specification of the die | dye used with the self-piercing rivet joining method of FIG. 本発明との比較のために使用したダイの断面説明図。Cross-sectional explanatory drawing of the die | dye used for the comparison with this invention.

符号の説明Explanation of symbols

１…ダイ
２…パッド
３…セルフピアスリベット
３ａ…頭部
３ｂ…軸部
４…加圧拘束面
５…突出部
５ａ…頂部
６…パンチ
Ｇ…隙間
Ｐ…膨出部
Ｗ１…上板（被接合部材）
Ｗ２…中板（被接合部材）
Ｗ３…下板（被接合部材） DESCRIPTION OF SYMBOLS 1 ... Die 2 ... Pad 3 ... Self-piercing rivet 3a ... Head 3b ... Shaft part 4 ... Pressure restraint surface 5 ... Protruding part 5a ... Top part 6 ... Punch G ... Gap P ... Protruding part W1 ... Upper plate (to-be-joined) Element)
W2 ... Middle plate (members to be joined)
W3 ... Lower plate (member to be joined)

Claims (7)

複数の板状の被接合部材同士を重ね合わせてそれら複数の被接合部材の一方の面にダイを当接させるとともに、複数の被接合部材の他方の面にダイ側に向けて円環状の軸部を有するセルフピアスリベットを打ち込むことにより複数の被接合部材同士をリベット接合する方法であって、
上記ダイは中央部が突出した凹状の加圧拘束面を有していて、
この加圧拘束面のうち当該加圧拘束面の最深部を含み且つセルフピアスリベットの少なくとも軸部の投影形状と合致する部分に被接合部材が接触する前にセルフピアスリベットの打ち込みを完了させることを特徴とするセルフピアスリベットによる接合方法。 A plurality of plate-like members to be joined are overlapped to bring a die into contact with one surface of the plurality of members to be joined, and an annular shaft facing the other side of the plurality of members to be joined toward the die side A method of riveting a plurality of members to be joined by driving a self-piercing rivet having a portion ,
The die has a concave pressure restraint surface with a protruding central part,
Completing the driving of the self-piercing rivet before the member to be joined comes into contact with the portion including the deepest portion of the pressure-restraining surface and matching the projected shape of at least the shaft portion of the self-piercing rivet. A bonding method using self-piercing rivets characterized by 上記ダイに当接する側の被接合部材とセルフピアスリベット打ち込み側の被接合部材との間にもう一枚の被接合部材が介在していることを特徴とする請求項１に記載のセルフピアスリベットによる接合方法。   2. The self-piercing rivet according to claim 1, wherein another member to be joined is interposed between the member to be joined on the die contact side and the member to be joined on the self-piercing rivet driving side. Joining method. 上記ダイに当接する側の被接合部材が鋼板であり、セルフピアスリベット打ち込み側の被接合部材がアルミニウム系板材であることを特徴とする請求項１または２に記載のセルフピアスリベットによる接合方法。   3. The method for joining by self-piercing rivet according to claim 1, wherein the member to be joined on the die contacting side is a steel plate, and the member to be joined on the self-piercing rivet driving side is an aluminum-based plate material. 上記ダイに当接する側の被接合部材が高張力鋼板または超高張力鋼板であり、セルフピアスリベット打ち込み側の被接合部材がアルミニウム合金板であることを特徴とする請求項３に記載のセルフピアスリベットによる接合方法。   4. The self-piercing according to claim 3, wherein the member to be joined on the side contacting the die is a high-tensile steel plate or an ultra-high-strength steel plate, and the member to be joined on the self-piercing rivet driving side is an aluminum alloy plate. Riveting method. 上記ダイに当接する側の被接合部材が高張力鋼板または超高張力鋼板であるとともに、セルフピアスリベット打ち込み側の被接合部材がアルミニウム合金板であり、且つ双方の被接合部材同士の間に介在するもう一枚の被接合部材が軟鋼板であることを特徴とする請求項２に記載のセルフピアスリベットによる接合方法。   The member to be joined on the die contact side is a high-strength steel plate or an ultra-high-strength steel plate, the member to be joined on the self-piercing rivet driving side is an aluminum alloy plate, and is interposed between the two members to be joined. The joining method using a self-piercing rivet according to claim 2, wherein the other member to be joined is a mild steel plate. 上記セルフピアスリベットが鋼系材料製のものであることを特徴とする請求項３〜５のいずれか一つに記載のセルフピアスリベットによる接合方法。6. The joining method using self-piercing rivets according to claim 3, wherein the self-piercing rivets are made of a steel-based material. 請求項１〜６のいずれかに一つに記載のセルフピアスリベットによる接合方法に用いるダイであって、A die used for the bonding method by self-piercing rivets according to any one of claims 1 to 6,
上記ダイの加圧拘束面のうち当該加圧拘束面の最深部を含み且つセルフピアスリベットの少なくとも軸部の投影形状と合致する部分に被接合部材が接触する前にセルフピアスリベットの打ち込みが完了するように、少なくとも上記加圧拘束面の深さおよび中央部の突出高さ位置をそれぞれ設定してあることを特徴とするリベット接合用ダイ。The self-piercing rivet driving is completed before the member to be joined comes into contact with the portion of the pressure-restraining surface of the die that includes the deepest portion of the pressure-restraining surface and matches the projected shape of at least the shaft portion of the self-piercing rivet. Thus, at least the depth of the pressure restraint surface and the protruding height position of the central portion are set, respectively, and a rivet joining die characterized by the above.
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