JP7332966B2 - Joint manufacturing method, joint, and automobile part - Google Patents
Joint manufacturing method, joint, and automobile part Download PDFInfo
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- JP7332966B2 JP7332966B2 JP2022534132A JP2022534132A JP7332966B2 JP 7332966 B2 JP7332966 B2 JP 7332966B2 JP 2022534132 A JP2022534132 A JP 2022534132A JP 2022534132 A JP2022534132 A JP 2022534132A JP 7332966 B2 JP7332966 B2 JP 7332966B2
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- 238000004519 manufacturing process Methods 0.000 title claims description 79
- 238000000034 method Methods 0.000 claims description 87
- 239000000463 material Substances 0.000 claims description 81
- 229910000831 Steel Inorganic materials 0.000 claims description 36
- 239000010959 steel Substances 0.000 claims description 36
- 238000010438 heat treatment Methods 0.000 claims description 22
- 238000002788 crimping Methods 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims 3
- 238000005304 joining Methods 0.000 description 66
- 230000000052 comparative effect Effects 0.000 description 52
- 238000010586 diagram Methods 0.000 description 32
- 238000003466 welding Methods 0.000 description 23
- 230000002093 peripheral effect Effects 0.000 description 20
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 17
- 229910052739 hydrogen Inorganic materials 0.000 description 17
- 239000001257 hydrogen Substances 0.000 description 17
- 238000005516 engineering process Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000003780 insertion Methods 0.000 description 5
- 230000037431 insertion Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000003825 pressing Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910017813 Cu—Cr Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
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- 230000008018 melting Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
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- 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
- F16B37/00—Nuts or like thread-engaging members
- F16B37/04—Devices for fastening nuts to surfaces, e.g. sheets, plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D27/00—Connections between superstructure or understructure sub-units
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
Description
本願が開示する技術は、継手の製造方法、継手、及び自動車部品に関する。 The technology disclosed by the present application relates to a joint manufacturing method, a joint, and an automobile part.
例えば、鋼板等の板材に金属製のナットを接合するための装置としては、プロジェクション溶接装置が知られている（例えば、特開２０１９－９８３８５号公報参照）。このプロジェクション溶接装置では、一対の電極によって、板材及びナット（プロジェクションナット）を挟んだ状態で、一対の電極間が通電される。ナットの軸方向一方側の端部には、ナットの周方向に間隔を空けて複数の凸部が形成されている。この複数の凸部と板材との複数の点接触部が、プロジェクション溶接により接合される。 For example, a projection welding device is known as a device for joining a metal nut to a plate material such as a steel plate (see, for example, Japanese Unexamined Patent Application Publication No. 2019-98385). In this projection welding device, a pair of electrodes are energized while sandwiching a plate material and a nut (projection nut) between the pair of electrodes. A plurality of protrusions are formed at intervals in the circumferential direction of the nut at one axial end of the nut. A plurality of point contact portions between the plurality of convex portions and the plate material are joined by projection welding.
このようなプロジェクション溶接による接合技術は、例えば、自動車の車体パネルの接合構造に広く利用されている（例えば、特開２０１９－９３８１９号公報参照）。このプロジェクション溶接による接合技術を用いた車体パネルの接合構造では、例えば、ナット（ウェルドナット）が接合された第一車体パネル材に第二車体パネル材が重ねられる。そして、第二車体パネル材の挿通穴に挿通されたボルトがナットにねじ込まれることにより、第二車体パネル材が第一車体パネル材に接合される。 Such joining technology by projection welding is widely used, for example, in joining structures of body panels of automobiles (see, for example, Japanese Patent Application Laid-Open No. 2019-93819). In a body panel joining structure using this joining technique by projection welding, for example, a second body panel member is superimposed on a first body panel member to which a nut (weld nut) is joined. Then, the second vehicle body panel member is joined to the first vehicle body panel member by screwing the bolt inserted through the insertion hole of the second vehicle body panel member into the nut.
以上は、プロジェクション溶接により、板材とナットとを接合する技術に関する説明である。板材にナットを固定する技術としては、次の技術がある。 The above is a description of a technique for joining a plate and a nut by projection welding. Techniques for fixing nuts to plate materials include the following techniques.
例えば、第一の固定技術では、ナット本体の軸方向一方側の端部に、内筒及び外壁を有するナット、すなわち、ピアスナットが用いられている（例えば、特開平１１－１９３８０８号公報、特開２００５－２４０８３６号公報、特許第５１０６２７９号公報、及び特許第５８７６４０５号公報参照）。このピアスナットを用いた固定技術では、板材にセットされたナットが、打込工具によって打ち込まれる。これにより、ナットの内筒によって板材の一部が打ち抜かれ、板材に穴が形成される。そして、この穴に内筒が挿入されると共に、穴の周囲部が内筒と外壁との間にかしめられることにより、板材にナットが固定される。 For example, in the first fixing technique, a nut having an inner cylinder and an outer wall at one end in the axial direction of the nut body, that is, a pierce nut is used (for example, JP-A-11-193808, JP-A-11-193808, JP-A-11-193808, See JP-A-2005-240836, Japanese Patent No. 5106279, and Japanese Patent No. 5876405). In this fixing technique using a pierce nut, a nut set on a plate is driven by a driving tool. As a result, part of the plate material is punched out by the inner cylinder of the nut, and a hole is formed in the plate material. The nut is fixed to the plate member by inserting the inner cylinder into the hole and crimping the periphery of the hole between the inner cylinder and the outer wall.
また、例えば、第二の固定技術では、フランジ部及び胴部を有するナット、すなわち、かしめナットが用いられている（例えば、特許第４０９３６７４号公報、特開２００１－０６５５２５号公報、特開平０９－１２６２１５号公報、特開２００８－１７５３７９号公報参照）。このかしめナットを用いた固定技術では、板材の穴に挿入されたナットの胴部が軸方向に潰されることにより、胴部に環状のかしめ変形部が形成される。そして、ナットのフランジ部及びかしめ変形部によって板材を挟んだ状態で、板材にナットが固定される。 Further, for example, in the second fixing technique, a nut having a flange portion and a trunk portion, that is, a caulked nut is used (for example, Japanese Patent No. 4093674, Japanese Unexamined Patent Publication No. 2001-065525, Japanese Unexamined Patent Publication No. 09- 126215 and Japanese Patent Laid-Open No. 2008-175379). In this fixing technique using a crimped nut, the body of the nut inserted into the hole of the plate material is crushed in the axial direction, thereby forming an annular crimped deformed portion in the body. Then, the nut is fixed to the plate while the plate is sandwiched between the flange portion and the caulking deformation portion of the nut.
しかしながら、上記従来の技術では、次の課題がある。すなわち、プロジェクション溶接による接合技術を用いた車体パネルの接合構造では、第二車体パネル材の挿通穴に通されたボルトを、第一車体パネル材に接合されたナットにねじ込む際に、ボルトによってナットが押し込まれる。したがって、ナットが第一車体パネル材から剥離される方向の押し込み荷重が、ナットに作用する。 However, the conventional technique described above has the following problems. That is, in the body panel joining structure using the joining technology by projection welding, when the bolt passed through the insertion hole of the second body panel material is screwed into the nut joined to the first body panel material, the nut is pushed by the bolt. is pushed. Therefore, a pressing load acts on the nut in the direction in which the nut is separated from the first vehicle body panel member.
ここで、プロジェクション溶接による接合技術では、ナットの周方向の全長に亘ってナットと板材とが溶接により接合されるのではなく、ナットに形成された複数の凸部と板材との複数の点接触部が、プロジェクション溶接により接合される。このため、ナットの剥離強度が不足する虞がある。また、ナットの剥離強度を高めるため、点接触部の溶融径を大きくすると、スパッタが発生する虞がある。このスパッタがナットのネジ穴に付着すると、ボルトをナットにねじ込めなくなる虞がある。 Here, in the joining technique by projection welding, the nut and the plate material are not joined by welding over the entire length of the nut in the circumferential direction. The parts are joined by projection welding. As a result, the peel strength of the nut may be insufficient. Moreover, if the melting diameter of the point contact portion is increased in order to increase the peel strength of the nut, spatter may occur. If this spatter adheres to the screw hole of the nut, there is a possibility that the bolt cannot be screwed into the nut.
また、ピアスナットを用いた上述の固定技術では、ナット本体から内筒に亘ってネジ穴が形成されている。したがって、打ち込まれたナットの内筒によって板材の一部を打ち抜く際に、内筒が変形すると共に、内筒の変形に伴ってネジ穴も変形する虞がある。 Further, in the above-described fixing technique using a pierce nut, a screw hole is formed from the nut body to the inner cylinder. Therefore, when a part of the plate material is punched by the inner cylinder of the driven nut, the inner cylinder may be deformed, and the screw hole may be deformed along with the deformation of the inner cylinder.
また、かしめナットを用いた固定技術においても、ナットの胴部にネジ穴が形成されている。そのため、胴部が軸方向に潰され、当該胴部にかしめ変形部が形成される際に、ネジ穴が変形する虞がある。 Also in the fixing technique using a crimp nut, a threaded hole is formed in the body of the nut. Therefore, when the barrel portion is crushed in the axial direction and the crimping deformation portion is formed in the barrel portion, the screw hole may be deformed.
本願が開示する技術は、一例として、締結部材の剥離強度を確保すると共に、締結部材のネジ穴にネジ部材の雄ネジ部がねじ込み難くなることを抑制することを第一の目的とする。 As an example, the technology disclosed in the present application aims to ensure the peel strength of the fastening member and to suppress the difficulty of screwing the male threaded portion of the screw member into the screw hole of the fastening member.
また、本願が開示する技術は、締結部材の剥離、及び締結部材のネジ穴にネジ部材の雄ネジ部がねじ込み難くなることを抑制すると共に、第１の板材と第２の板材とを適切に接合することを第二の目的とする。 In addition, the technology disclosed in the present application suppresses peeling of the fastening member and difficulty in screwing the male threaded portion of the screw member into the screw hole of the fastening member, and properly connects the first plate member and the second plate member. The second purpose is to join.
第１態様に係る締結部材は、軸部と、前記軸部の軸方向端部に設けられたフランジと、を備えた締結部材であって、前記締結部材には、前記軸部の軸方向に沿って前記軸部及び前記フランジを貫通する第１の貫通穴があり、前記フランジにおける前記第１の貫通穴は、ネジ穴であって、前記軸部の横断面における前記第１の貫通穴の径は、前記フランジの横断面における前記ネジ穴の谷径より大きい。 A fastening member according to a first aspect is a fastening member including a shaft portion and a flange provided at an axial end portion of the shaft portion, wherein the fastening member has a There is a first through-hole extending through the shank and the flange along, the first through-hole in the flange being a threaded hole, the cross-section of the first through-hole in the cross section of the shank. The diameter is greater than the root diameter of the threaded hole in the cross section of the flange.
第２態様に係る締結部材は、第１態様に係る締結部材において、前記フランジの外径は、前記軸部の外径より大きく、前記フランジの肉厚は、前記軸部の肉厚より厚い。 A fastening member according to a second aspect is the fastening member according to the first aspect, wherein the outer diameter of the flange is larger than the outer diameter of the shaft portion, and the thickness of the flange is thicker than the thickness of the shaft portion.
第３態様に係る締結部材は、第１態様又は第２態様に係る締結部材において、軸部は、雄ネジである。 A fastening member according to a third aspect is the fastening member according to the first aspect or the second aspect, wherein the shaft portion is a male screw.
第４態様に係る継手の接合方法は、第２の貫通穴のある第１の板材の前記第２の貫通穴に、第１態様～第３態様の何れか１つに係る前記軸部を通すこと、前記第１の板材に前記フランジを当接させること、前記軸部の先端を潰して前記第１の板材をかしめること、を備える。 A joint joining method according to a fourth aspect includes passing the shaft portion according to any one of the first to third aspects through the second through hole of a first plate having a second through hole. bringing the flange into contact with the first plate member; and crimping the first plate member by crushing the tip of the shaft portion.
第５態様に係る継手の接合方法は、第４態様に係る継手の製造方法において、前記フランジの外径は、前記軸部の外径より大きく、前記フランジの肉厚は、前記軸部の肉厚より厚い。 A joint joining method according to a fifth aspect is the joint manufacturing method according to the fourth aspect, wherein the outer diameter of the flange is larger than the outer diameter of the shaft portion, and the thickness of the flange is the thickness of the shaft portion. Thicker than thick.
第６態様に係る継手の接合方法は、第４態様又は第５態様に係る継手の製造方法において、前記第２の貫通穴は、ネジ穴であって、前記軸部は、雄ネジであって、前記軸部を前記第２の貫通穴にねじ込む。 A joint joining method according to a sixth aspect is the joint manufacturing method according to the fourth aspect or the fifth aspect, wherein the second through hole is a screw hole, and the shaft portion is a male screw. , screwing the shaft into the second through hole;
第７態様に係る継手の接合方法は、第４態様又は第５態様に係る継手の製造方法において、前記第２の貫通穴は、多角穴であって、前記軸部を前記第２の貫通穴に係合する。 A joint joining method according to a seventh aspect is the method for manufacturing a joint according to the fourth aspect or the fifth aspect, wherein the second through hole is a polygonal hole, and the shaft portion is connected to the second through hole. to engage.
第８態様に係る継手の接合方法は、第４態様～第７態様の何れか１つに係る継手の製造方法において、前記締結部材を軸方向両側から一対の加熱加圧部材で挟んだ状態で、前記一対の加熱加圧部材によって前記締結部材を加熱するとともに前記締結部材の軸方向に加圧することにより、前記軸部の先端を潰して前記第１の板材をかしめる。 A joint joining method according to an eighth aspect is the joint manufacturing method according to any one of the fourth to seventh aspects, wherein the fastening member is sandwiched between a pair of heating and pressurizing members from both sides in the axial direction. The pair of heating and pressurizing members heats the fastening member and applies pressure to the fastening member in the axial direction, thereby crushing the tip of the shaft portion and crimping the first plate member.
第９態様に係る継手の接合方法は、第８態様に係る継手の製造方法において、前記締結部材は、金属製であって、前記第１の板材は、引張強さが７８０ＭＰａ以上の鋼板であって、前記一対の加熱加圧部材は、一対の電極である。 A joint joining method according to a ninth aspect is the joint manufacturing method according to the eighth aspect, wherein the fastening member is made of metal, and the first plate material is a steel plate having a tensile strength of 780 MPa or more. The pair of heating and pressurizing members are a pair of electrodes.
第１０態様に係る継手の接合方法は、第４態様～第９態様の何れか１つに係る継手の製造方法において、第３の貫通穴のある第２の板材の前記第３の貫通穴に、ネジ部材の雄ネジ部を通すこと、前記雄ネジ部を前記軸部の前記第１の貫通穴に通すこと、前記雄ネジ部を前記ネジ穴にねじ込んで前記第２の板材を固定すること、を備える。 A method for joining a joint according to a tenth aspect is the method for manufacturing a joint according to any one of the fourth to ninth aspects, wherein the third through hole of the second plate member having the third through hole passing the male screw portion of a screw member through, passing the male screw portion through the first through hole of the shaft portion, and screwing the male screw portion into the screw hole to fix the second plate member. , provided.
第１１態様に係る継手の接合方法は、第１０態様に係る継手の製造方法において、前記第１の板材は、前記第２の板材と反対側に膨出するとともに、頂部に前記第２の貫通穴のある膨出部を有する。 A method for joining a joint according to an eleventh aspect is the method for manufacturing a joint according to the tenth aspect, wherein the first plate member bulges to the side opposite to the second plate member, and has the second through hole at the top. It has a bulge with a hole.
第１２態様に係る継手は、第２の貫通穴のある板材と、前記軸部が前記第２の貫通穴に通された状態で、前記フランジが前記板材に当接された第１態様～第３態様の何れか１つに係る締結部材と、を備え、前記第２の貫通穴から突出する前記軸部の先端部には、前記フランジとで前記板材をかしめるかしめ部が形成されている。 A joint according to a twelfth aspect includes a plate member having a second through hole, and the first aspect to the first aspect in which the flange is in contact with the plate member in a state where the shaft portion is passed through the second through hole. and a fastening member according to any one of the three aspects, wherein a crimping portion for crimping the plate material with the flange is formed at a tip portion of the shaft portion projecting from the second through hole. .
第１３態様に係る自動車部品は、第１２態様に係る継手を備える。 An automobile component according to a thirteenth aspect includes the joint according to the twelfth aspect.
本願が開示する技術によれば、一例として、締結部材の剥離強度を確保すると共に、締結部材のネジ穴にネジ部材の雄ネジ部がねじ込み難くなることを抑制することができる。 According to the technology disclosed in the present application, as an example, it is possible to secure the peel strength of the fastening member and to suppress the difficulty of screwing the male screw portion of the screw member into the screw hole of the fastening member.
また、本願が開示する技術は、締結部材の剥離、及び締結部材のネジ穴にネジ部材の雄ネジ部がねじ込み難くなることを抑制すると共に、第１の板材と第２の板材とを適切に接合することができる。 In addition, the technology disclosed in the present application suppresses peeling of the fastening member and difficulty in screwing the male threaded portion of the screw member into the screw hole of the fastening member, and properly connects the first plate member and the second plate member. can be spliced.
［第一実施形態］
はじめに、本発明の第一実施形態について説明する。[First embodiment]
First, a first embodiment of the present invention will be described.
図１Ａ、及び図１Ｂは、第一実施形態に係る締結部材１０を示す図である。図１Ａは、締結部材１０の正面図である。図１Ｂは、締結部材１０の縦断面図である。矢印Ａ１は、締結部材１０の軸方向一方側を示し、矢印Ａ２は、締結部材１０の軸方向他方側を示している。 1A and 1B are diagrams showing the fastening member 10 according to the first embodiment. FIG. 1A is a front view of the fastening member 10. FIG. FIG. 1B is a vertical cross-sectional view of the fastening member 10. FIG. The arrow A1 indicates one axial side of the fastening member 10, and the arrow A2 indicates the other axial side of the fastening member 10. As shown in FIG.
図１Ａ、及び図１Ｂに示されるように、締結部材１０（例えば、リベットナット、ナット）は、軸部１２と、軸部１２の軸方向端部に設けられたフランジ１１とを有する。また、締結部材１０には、軸部１２の軸方向に沿って、軸部１２及びフランジ１１を貫通する第１の貫通穴がある。この締結部材１０は、一例として、金属製である。 As shown in FIGS. 1A and 1B, a fastening member 10 (eg, rivet nut, nut) has a shaft portion 12 and a flange 11 provided at an axial end of the shaft portion 12 . Further, the fastening member 10 has a first through-hole extending through the shaft portion 12 and the flange 11 along the axial direction of the shaft portion 12 . The fastening member 10 is, for example, made of metal.
フランジ１１（ナット本体、雌ネジ部）は、環状に形成されている。このフランジ１１における第１の貫通穴は、ネジ穴１３である。ネジ穴１３は、フランジ１１の中心部に形成されている。なお、フランジ１１における第１の貫通穴の全体がネジ穴１３とされても良いし、フランジ１１における第１の貫通穴の一部がネジ穴１３とされても良い。軸部１２（筒状部）は、フランジ１１の軸方向一方側の端部から突出している。この軸部１２は、円筒である。また、軸部１２における第１の貫通穴は、貫通穴１４である。貫通穴１４は、軸部１２の中心部に形成されている。 The flange 11 (nut body, female screw portion) is formed in an annular shape. A first through hole in this flange 11 is a screw hole 13 . A screw hole 13 is formed in the center of the flange 11 . The entire first through hole in the flange 11 may be the screw hole 13 , or part of the first through hole in the flange 11 may be the screw hole 13 . The shaft portion 12 (cylindrical portion) protrudes from one axial end portion of the flange 11 . This shaft portion 12 is cylindrical. A first through hole in the shaft portion 12 is a through hole 14 . The through hole 14 is formed in the central portion of the shaft portion 12 .
ネジ穴１３及び貫通穴１４は、締結部材１０を軸部１２の軸方向に貫通する第１の貫通穴を構成している。貫通穴１４は、ネジ穴１３と同軸に配置されるとともに、ネジ穴１３と通じている。フランジ１１の外径Ｄ１は、軸部１２の外径Ｄ２よりも大きい。軸部１２の横断面における貫通穴１４の径ｄ２（内径）は、フランジ１１の横断面におけるネジ穴１３の谷径ｄ１（内径、穴径）よりも大きい。また、フランジ１１の肉厚（Ｄ１－ｄ１）は、軸部１２の肉厚（Ｄ２－ｄ２）よりも厚い。なお、ネジ穴１３の谷径ｄ１とは、雌ネジの谷底に接する仮想的な円筒の直径を意味する。 The screw hole 13 and the through hole 14 constitute a first through hole that passes through the fastening member 10 in the axial direction of the shaft portion 12 . The through hole 14 is arranged coaxially with the screw hole 13 and communicates with the screw hole 13 . The outer diameter D1 of the flange 11 is larger than the outer diameter D2 of the shaft portion 12 . The diameter d2 (inner diameter) of the through hole 14 in the cross section of the shaft portion 12 is larger than the root diameter d1 (inner diameter, hole diameter) of the screw hole 13 in the cross section of the flange 11 . Further, the thickness (D1-d1) of the flange 11 is thicker than the thickness (D2-d2) of the shaft portion 12. As shown in FIG. The root diameter d1 of the screw hole 13 means the diameter of an imaginary cylinder in contact with the root of the female thread.
続いて、第一実施形態に係る継手の製造方法について説明する。 Next, a method for manufacturing a joint according to the first embodiment will be described.
図２Ａ、及び図２Ｂは、第一実施形態に係る継手の製造方法（接合継手の製造方法）を説明する図である。図２Ａは、継手の製造方法の第一工程を説明する図である。図２Ｂは、継手の製造方法の第二工程を説明する図である。 2A and 2B are diagrams for explaining the joint manufacturing method (bonded joint manufacturing method) according to the first embodiment. FIG. 2A is a diagram explaining the first step of the joint manufacturing method. FIG. 2B is a diagram explaining the second step of the joint manufacturing method.
第一実施形態に係る継手の製造方法は、板材２０の被接合部２１に締結部材１０を固定して、被接合部２１及び締結部材１０を備える接合継手３０を得る方法である。板材２０は、例えば、引張強さが７８０ＭＰａ以上の鋼板であり、好ましくは、引張強さが９８０ＭＰａ以上の鋼板である。また、板材２０を構成する鋼板の板厚は、例えば、０．５ｍｍ～４．０ｍｍである。なお、板材２０は、表面処理鋼板でもよい。また、板材２０は、第１の板材の一例である。 The joint manufacturing method according to the first embodiment is a method of fixing the fastening member 10 to the joined portion 21 of the plate material 20 to obtain the joined joint 30 including the joined portion 21 and the fastening member 10 . The plate material 20 is, for example, a steel plate with a tensile strength of 780 MPa or more, preferably a steel plate with a tensile strength of 980 MPa or more. Further, the plate thickness of the steel plate forming the plate material 20 is, for example, 0.5 mm to 4.0 mm. Note that the plate material 20 may be a surface-treated steel plate. Also, the plate member 20 is an example of a first plate member.
被接合部２１には、当該被接合部２１を板厚方向に貫通する貫通穴２２（通し穴）が形成されている。貫通穴２２は、断面が円形状の丸穴である。被接合部２１は、貫通穴２２を含む所定の範囲の部位である。なお、貫通穴２２は、第２の貫通穴の一例である。また、図２Ａ、及び図２Ｂでは、板材２０のうちの被接合部２１のみが示されている。被接合部２１は、第一板面２１Ａと、この第一板面２１Ａとは反対側の第二板面２１Ｂとを有している。 A through hole 22 (through hole) is formed in the joined portion 21 so as to pass through the joined portion 21 in the plate thickness direction. The through hole 22 is a round hole with a circular cross section. The joined portion 21 is a portion within a predetermined range including the through hole 22 . The through hole 22 is an example of a second through hole. In addition, in FIGS. 2A and 2B, only the joined portion 21 of the plate material 20 is shown. The joined portion 21 has a first plate surface 21A and a second plate surface 21B opposite to the first plate surface 21A.
第一実施形態に係る継手の製造方法は、締結部材１０を被接合部２１に固定する工程として、第一工程及び第二工程を備える。 The joint manufacturing method according to the first embodiment includes a first step and a second step as steps for fixing the fastening member 10 to the joined portion 21 .
図２Ａに示されるように、第一工程では、第一板面２１Ａ側から軸部１２を貫通穴２２に通し、フランジ１１を板材２０の第一板面２１Ａにおける貫通穴２２の周囲部に当接させる。また、軸部１２の先端（先端部）を被接合部２１の第二板面２１Ｂから突出させる。 As shown in FIG. 2A, in the first step, the shaft portion 12 is passed through the through hole 22 from the first plate surface 21A side, and the flange 11 is brought into contact with the peripheral portion of the through hole 22 in the first plate surface 21A of the plate member 20. contact. Also, the tip (tip) of the shaft portion 12 is projected from the second plate surface 21B of the joined portion 21 .
軸部１２の軸長Ｌは、被接合部２１の板厚Ｔよりも長い。また、フランジ１１の外径Ｄ１は、貫通穴２２の径ｄ３よりも大きい。また、軸部１２の外径Ｄ２は、貫通穴２２の径ｄ３よりも小さい。被接合部２１に対する締結部材１０のがたつきを抑制するためには、軸部１２の外径Ｄ２が、貫通穴２２の径ｄ３よりも僅かに小さいことが望ましい。なお、軸部１２は、貫通穴２２に圧入されてもよい。 The axial length L of the shaft portion 12 is longer than the plate thickness T of the joined portion 21 . Also, the outer diameter D1 of the flange 11 is larger than the diameter d3 of the through hole 22 . Also, the outer diameter D2 of the shaft portion 12 is smaller than the diameter d3 of the through hole 22 . In order to suppress rattling of the fastening member 10 with respect to the joined portion 21 , it is desirable that the outer diameter D2 of the shaft portion 12 is slightly smaller than the diameter d3 of the through hole 22 . Note that the shaft portion 12 may be press-fitted into the through hole 22 .
図２Ｂに示されるように、第二工程では、締結部材１０の軸方向両側から締結部材１０を一対の電極４０で挟んだ状態とする。一対の電極４０は、「一対の加熱加圧部材」の一例である。そして、一対の電極４０間に通電し、この一対の電極４０によって締結部材１０を通電加熱しながら締結部材１０の軸方向に加圧することにより、軸部１２の先端を潰して板材２０をかしめる。これにより、軸部１２の先端部には、軸部１２の径方向外側に拡がるかしめ部１５が形成される。このかしめ部１５は、軸部１２の周方向に沿って環状に形成される。なお、一対の電極４０による締結部材１０の加熱及び加圧は、必ずしも同時に行う必要はなく、別々に行うことも可能である。 As shown in FIG. 2B , in the second step, the fastening member 10 is sandwiched between the pair of electrodes 40 from both axial sides of the fastening member 10 . The pair of electrodes 40 is an example of "a pair of heating and pressurizing members." Then, an electric current is passed between the pair of electrodes 40, and the fastening member 10 is pressurized in the axial direction while the fastening member 10 is energized and heated by the pair of electrodes 40, thereby crushing the tip of the shaft portion 12 and crimping the plate member 20. . As a result, a crimped portion 15 extending radially outward of the shaft portion 12 is formed at the distal end portion of the shaft portion 12 . The crimped portion 15 is formed in an annular shape along the circumferential direction of the shaft portion 12 . The heating and pressing of the fastening member 10 by the pair of electrodes 40 do not necessarily have to be performed simultaneously, and can be performed separately.
このとき、かしめ部１５の外径Ｄ４が、貫通穴２２の径ｄ３よりも大きくなるように、かしめ部１５が形成される。これにより、かしめ部１５は、第二板面２１Ｂにおける貫通穴２２の周囲部に圧着（係止）される。つまり、フランジ状に形成されたかしめ部１５が、第二板面２１Ｂにおける貫通穴２２の周囲部に重なり、この貫通穴２２の周囲部に引っ掛かった状態となる。 At this time, the crimped portion 15 is formed such that the outer diameter D4 of the crimped portion 15 is larger than the diameter d3 of the through hole 22 . As a result, the crimped portion 15 is crimped (locked) to the peripheral portion of the through hole 22 on the second plate surface 21B. That is, the crimped portion 15 formed in a flange shape overlaps the peripheral portion of the through hole 22 in the second plate surface 21B and is caught by the peripheral portion of the through hole 22 .
このようにして、フランジ１１を第一板面２１Ａにおける貫通穴２２の周囲部に当接させる。また、第二板面２１Ｂにおける貫通穴２２の周囲部に圧着するかしめ部１５を軸部１２の先端部に形成する。これにより、フランジ１１及びかしめ部１５によって被接合部２１を挟んだ状態で、被接合部２１に締結部材１０が固定される。また、フランジ１１及びかしめ部１５によって被接合部２１を加圧した状態で挟むことにより、被接合部２１に対する締結部材１０の回転が規制される。 In this manner, the flange 11 is brought into contact with the periphery of the through hole 22 on the first plate surface 21A. Further, a crimped portion 15 is formed at the tip of the shaft portion 12 to be press-fitted to the peripheral portion of the through hole 22 on the second plate surface 21B. As a result, the fastening member 10 is fixed to the joined portion 21 with the joined portion 21 sandwiched between the flange 11 and the crimped portion 15 . Further, by sandwiching the jointed portion 21 under pressure between the flange 11 and the crimped portion 15 , rotation of the fastening member 10 with respect to the jointed portion 21 is restricted.
なお、軸部１２の先端が変形することにより、この軸部１２の先端部には、上述のかしめ部１５に加えて、軸部１２の径方向内側に延出する延出部１６が形成される。この延出部１６は、軸部１２の周方向に沿って環状に形成される。 By deforming the tip of the shaft portion 12, an extension portion 16 extending radially inward of the shaft portion 12 is formed at the tip portion of the shaft portion 12 in addition to the crimped portion 15 described above. be. The extending portion 16 is formed in an annular shape along the circumferential direction of the shaft portion 12 .
ところで、延出部１６の内径ｄ４がネジ穴１３の谷径ｄ１よりも小さくなると、後述するように、締結部材１０の軸方向一方側（矢印Ａ１側）からネジ穴１３にボルトをねじ込むことができなくなる（螺入できなくなる）。 By the way, when the inner diameter d4 of the extending portion 16 is smaller than the root diameter d1 of the screw hole 13, it is possible to screw a bolt into the screw hole 13 from one axial side (arrow A1 side) of the fastening member 10, as described later. It becomes impossible (it becomes impossible to screw in).
そこで、第二工程では、延出部１６の内径ｄ４がネジ穴１３の谷径ｄ１よりも小さくならないように、一対の電極４０による加熱温度、加圧力、加圧時間、又は一対の電極４０の形状等により、軸部１２の先端部の径方向内側への変形量が調整される。また、延出部１６の内径ｄ４がネジ穴１３の谷径ｄ１よりも小さくならないように、加圧変形前の軸部１２の貫通穴１４の径ｄ２の大きさが設定される。これにより、延出部１６の内径ｄ４が、ネジ穴１３の谷径ｄ１よりも小さくなることが抑制される。さらに、加圧変形前の軸部１２の貫通穴１４には、フランジ１１側に向かって先細りになるテーパを設けてもよい。これにより、軸部１２が軸方向に変形する際に、軸部１２が内側に変形し難くなるため、内径ｄ４がネジ穴１３の谷径ｄ１よりも小さくなることが抑制される。 Therefore, in the second step, the heating temperature, pressure, and pressure time of the pair of electrodes 40 are adjusted so that the inner diameter d4 of the extension 16 does not become smaller than the root diameter d1 of the screw hole 13. The amount of radially inward deformation of the tip portion of the shaft portion 12 is adjusted depending on the shape and the like. In addition, the size of the diameter d2 of the through hole 14 of the shaft portion 12 before pressure deformation is set so that the inner diameter d4 of the extension portion 16 is not smaller than the root diameter d1 of the screw hole 13 . This prevents the inner diameter d4 of the extending portion 16 from becoming smaller than the root diameter d1 of the screw hole 13 . Furthermore, the through hole 14 of the shaft portion 12 before pressure deformation may be provided with a taper that tapers toward the flange 11 side. This makes it difficult for the shaft portion 12 to deform inward when the shaft portion 12 is deformed in the axial direction.
この第二工程は、溶接工程ではなく、かしめ工程である。そのため、この第二工程では、被接合部２１が溶融しない加熱温度で、一対の電極４０によって締結部材１０を通電加熱しながら加圧する。 This second process is not a welding process but a crimping process. Therefore, in the second step, the fastening member 10 is electrically heated and pressurized by the pair of electrodes 40 at a heating temperature that does not melt the part to be joined 21 .
この第二工程では、鋼板である板材２０が溶融しないため、大気中や板材２０の表面の防錆油から水素が板材２０の内部に侵入することが抑制される。また、板材２０が高温から急冷されず、フレッシュマルテンサイトにならないことから、板材２０に水素脆化が生じることが抑制される。これらのことは、プロジェクション溶接に比べて、第一実施形態の優位な特徴である。なお、水素脆化とは、鋼板中に吸収された水素により鋼板に割れが生じたり、鋼板の強度（延性又は靭性）が低下したりする現象のことである。 In the second step, since the plate material 20 which is a steel plate is not melted, hydrogen is suppressed from entering the inside of the plate material 20 from the atmosphere or from the rust preventive oil on the surface of the plate material 20 . Further, since the plate material 20 is not rapidly cooled from a high temperature and does not become fresh martensite, the occurrence of hydrogen embrittlement in the plate material 20 is suppressed. These are the advantageous features of the first embodiment compared to projection welding. Hydrogen embrittlement is a phenomenon in which hydrogen absorbed in a steel sheet causes cracks in the steel sheet or decreases the strength (ductility or toughness) of the steel sheet.
第一実施形態に係る継手の製造方法では、以上の要領により、板材２０に形成された被接合部２１に締結部材１０が接合される。これにより、被接合部２１及び締結部材１０を備える接合継手３０が得られる。この接合継手３０は、例えば、自動車部品に好適である。このような接合継手３０を備える自動車部品としては、例えば、Ａピラー、Ｂピラー、サイドメンバ、ロッカ、ルーフサイドレール、及びバンパリインフォースメント等の車体骨格部材が挙げられる。 In the joint manufacturing method according to the first embodiment, the fastening member 10 is joined to the joined portion 21 formed on the plate member 20 in the manner described above. Thereby, the joining joint 30 including the joined portion 21 and the fastening member 10 is obtained. This joining joint 30 is suitable for automobile parts, for example. Automobile parts having such joints 30 include, for example, body frame members such as A pillars, B pillars, side members, rockers, roof side rails, and bumper reinforcements.
この接合継手３０において、締結部材１０は、ネジ穴１３を有するフランジ１１と、フランジ１１の軸方向一方側の端部（軸方向端部）から突出する軸部１２とを備える。軸部１２は、ネジ穴１３と同軸に形成された貫通穴１４を有する。軸部１２は、被接合部２１に形成された貫通穴２２に通されている。フランジ１１は、第一板面２１Ａにおける貫通穴２２の周囲部に当接している。軸部１２の先端部は、被接合部２１の第二板面２１Ｂから突出している。この軸部１２の先端部には、第二板面２１Ｂにおける貫通穴２２の周囲部に圧着（係止）されたかしめ部１５が形成されている。 In this joining joint 30 , the fastening member 10 includes a flange 11 having a screw hole 13 and a shaft portion 12 projecting from one axial end (axial end) of the flange 11 . The shaft portion 12 has a through hole 14 formed coaxially with the screw hole 13 . The shaft portion 12 is passed through a through hole 22 formed in the joined portion 21 . The flange 11 is in contact with the periphery of the through hole 22 on the first plate surface 21A. A tip portion of the shaft portion 12 protrudes from the second plate surface 21B of the joined portion 21 . A crimped portion 15 is formed at the distal end portion of the shaft portion 12 and crimped (locked) to the peripheral portion of the through hole 22 in the second plate surface 21B.
続いて、第一実施形態に係る板材接合方法について説明する。 Next, a method for joining plate materials according to the first embodiment will be described.
図３Ａ、及び図３Ｂは、第一実施形態に係る板材接合方法を説明する図である。図３Ａは、板材接合方法の第一工程を説明する図である。図３Ｂは、板材接合方法の第二工程を説明する図である。 3A and 3B are diagrams for explaining the method for joining plate materials according to the first embodiment. FIG. 3A is a diagram for explaining the first step of the method for joining plate materials. FIG. 3B is a diagram for explaining the second step of the method for joining plate materials.
なお、以降の説明では、板材接合方法によって得らえる板材接合構造７０の第２の板材５０及び第２の被接合部５１と区別するために、板材２０を第１の板材２０と称し、被接合部２１を第１の被接合部２１と称する。 In the following description, the plate member 20 will be referred to as the first plate member 20 in order to distinguish it from the second plate member 50 and the second joined portion 51 of the plate member joining structure 70 obtained by the plate member joining method. The joining portion 21 is referred to as a first joining portion 21 .
第一実施形態に係る板材接合方法は、第１の板材２０の第１の被接合部２１に、第１の板材２０とは別の第２の板材５０の第２の被接合部５１を接合する方法である。 In the method for joining plate materials according to the first embodiment, the second part to be joined 51 of the second plate material 50 different from the first plate material 20 is joined to the first part to be joined 21 of the first plate material 20. It is a way to
第一実施形態に係る板材接合方法は、第１の被接合部２１に第２の被接合部５１を接合する工程として、第一工程及び第二工程を備える。 The method for joining plate materials according to the first embodiment includes a first step and a second step as steps of joining the second portion to be joined 51 to the first portion to be joined 21 .
図３Ａに示されるように、第一工程では、上述の第一実施形態に係る継手の製造方法によって製造された接合継手３０における第１の被接合部２１に、第２の板材５０の第２の被接合部５１を重ね合わせる。 As shown in FIG. 3A , in the first step, the second plate material 50 is attached to the first welded portion 21 of the welded joint 30 manufactured by the joint manufacturing method according to the first embodiment described above. are superimposed on each other.
第２の被接合部５１は、膨出部５３を有する。膨出部５３は、第２の板材５０の平坦部５４に対して第１の板材２０と反対側に膨出する形状を有する。膨出部５３の頂部には、第２の板材５０の板厚方向に貫通する貫通穴５２（挿通穴）が形成されている。第二工程では、膨出部５３の内側に軸部１２の先端部が位置すると共に、貫通穴５２が締結部材１０と同軸上に位置するように、第１の被接合部２１に対して第２の被接合部５１が位置決めされる。なお、貫通穴５２は、第３の貫通穴の一例である。 The second joined portion 51 has a bulging portion 53 . The bulging portion 53 has a shape that bulges to the side opposite to the first plate member 20 with respect to the flat portion 54 of the second plate member 50 . A through hole 52 (insertion hole) that penetrates the second plate member 50 in the plate thickness direction is formed at the top of the bulging portion 53 . In the second step, the first to-be-joined portion 21 is positioned so that the tip portion of the shaft portion 12 is positioned inside the bulging portion 53 and the through hole 52 is positioned coaxially with the fastening member 10 . 2 to be joined 51 are positioned. The through hole 52 is an example of a third through hole.
図３Ｂに示されるように、第二工程では、ボルト６０を用いる。ボルト６０は、頭部６１及び雄ネジ部６３を有する。この第二工程では、第２の被接合部５１側から雄ネジ部６３を貫通穴５２に通すと共に、雄ネジ部６３を締結部材１０のネジ穴１３にねじ込む（螺入する）。これにより、締結部材１０のフランジ１１とボルト６０の頭部６１とによって、第１の被接合部２１及び第２の被接合部５１が挟まれた状態で、第１の被接合部２１及び第２の被接合部５１が接合される。なお、ボルト６０は、ネジ部材の一例である。 As shown in FIG. 3B, the second step uses bolts 60 . The bolt 60 has a head 61 and a male threaded portion 63 . In this second step, the male threaded portion 63 is passed through the through hole 52 from the second joined portion 51 side, and the male threaded portion 63 is screwed (screwed) into the screw hole 13 of the fastening member 10 . As a result, the first joint portion 21 and the second joint portion 51 are held between the flange 11 of the fastening member 10 and the head portion 61 of the bolt 60 . 2 to-be-joined part 51 is joined. Note that the bolt 60 is an example of a screw member.
第一実施形態に係る板材接合方法では、以上の要領により、締結部材１０及びボルト６０を用いて第１の被接合部２１及び第２の被接合部５１が接合される。これにより、締結部材１０、ボルト６０、第１の被接合部２１、及び第２の被接合部５１を備える板材接合構造７０が得られる。 In the plate member joining method according to the first embodiment, the first joined portion 21 and the second joined portion 51 are joined using the fastening member 10 and the bolt 60 in the manner described above. As a result, the plate member joining structure 70 including the fastening member 10, the bolt 60, the first joined portion 21, and the second joined portion 51 is obtained.
このような板材接合構造７０は、例えば、自動車の車体パネルの接合構造、特に、高強度鋼板である車体パネルを含む自動車部品に好適である。板材接合構造７０を備える自動車部品としては、例えば、Ａピラー、Ｂピラー、サイドメンバ、ロッカ、ルーフサイドレール、バンパリインフォースメント等の車体骨格部材が挙げられる。この板材接合構造７０は、負荷応力が高い部位（点）に特に好適である。しかしながら、板材接合構造７０は、自動車部品以外に適用されてもよいことは勿論である。 Such a plate material joining structure 70 is suitable for, for example, a joining structure for a body panel of an automobile, particularly an automobile part including a body panel made of high-strength steel plate. Automobile parts including the plate material joining structure 70 include, for example, body frame members such as A pillars, B pillars, side members, rockers, roof side rails, and bumper reinforcements. This plate material joining structure 70 is particularly suitable for sites (points) where load stress is high. However, it goes without saying that the plate material joining structure 70 may be applied to other than automobile parts.
なお、図２Ａ、及び図２Ｂに示される継手の製造方法における第一工程及び第二工程を、第一実施形態に係る板材接合方法における第一工程及び第二工程（前工程）とする場合、図３Ａ、及び図３Ｂに示される第一工程及び第二工程（後工程）は、第一実施形態に係る板材接合方法における第三工程及び第四工程にそれぞれ相当する。 2A and 2B in the method for manufacturing the joint shown in FIG. The first step and second step (post-step) shown in FIGS. 3A and 3B respectively correspond to the third step and fourth step in the method for joining plate materials according to the first embodiment.
また、第一実施形態に係る継手の製造方法は、貫通穴２２のある第１の板材２０の貫通穴２２に、締結部材１０の軸部１２を通すこと、第１の板材２０にフランジ１１を当接させること、軸部１２の先端を潰して第１の板材２０をかしめること、貫通穴５２のある第２の板材５０の貫通穴５２に、ネジ部材としてのボルト６０の雄ネジ部６３を通すこと、雄ネジ部６３を軸部１２の貫通穴１４に通すこと、雄ネジ部６３をネジ穴１３にねじ込んで第２の板材５０を固定すること、を備える。 In addition, the joint manufacturing method according to the first embodiment includes passing the shaft portion 12 of the fastening member 10 through the through hole 22 of the first plate member 20 having the through hole 22, and attaching the flange 11 to the first plate member 20. The first plate member 20 is crimped by crushing the tip of the shaft portion 12, and the male screw portion 63 of the bolt 60 as a screw member is inserted into the through hole 52 of the second plate member 50 having the through hole 52. , passing the male screw portion 63 through the through hole 14 of the shaft portion 12 , and screwing the male screw portion 63 into the screw hole 13 to fix the second plate member 50 .
続いて、第一実施形態の作用及び効果について説明する。 Next, the action and effects of the first embodiment will be described.
第一実施形態によれば、継手の製造方法（図２Ｂ参照）の第二工程において、締結部材１０の軸方向両側から締結部材１０を一対の電極４０で挟んだ状態で、一対の電極４０によって締結部材１０を通電加熱しながら加圧する。そして、軸部１２の先端を潰すことにより、軸部１２の先端部に第二板面２１Ｂにおける貫通穴２２の周囲部に圧着されるかしめ部１５を形成する。 According to the first embodiment, in the second step of the joint manufacturing method (see FIG. 2B), the fastening member 10 is sandwiched between the pair of electrodes 40 from both axial sides of the fastening member 10, and the pair of electrodes 40 The fastening member 10 is pressurized while being electrically heated. By crushing the tip of the shaft portion 12, the crimped portion 15 is formed at the tip portion of the shaft portion 12 so as to be press-fitted to the peripheral portion of the through hole 22 in the second plate surface 21B.
したがって、かしめ部１５が貫通穴２２の周囲部に圧着することにより、かしめ部１５が貫通穴２２の周囲部に引っ掛かる抜止部として機能するので、締結部材１０の剥離強度が高められる。これにより、図３Ａ、及び図３Ｂに示されるように、ボルト６０の雄ネジ部６３を締結部材１０のネジ穴１３にねじ込む際に、締結部材１０が第１の被接合部２１から剥離する方向の押し込み荷重が締結部材１０に作用しても、第１の被接合部２１から締結部材１０が剥離することが抑制される。 Therefore, by crimping the crimped portion 15 to the periphery of the through hole 22 , the crimped portion 15 functions as a retaining portion that is caught by the periphery of the through hole 22 , thereby increasing the peel strength of the fastening member 10 . Accordingly, as shown in FIGS. 3A and 3B, when the male screw portion 63 of the bolt 60 is screwed into the screw hole 13 of the fastening member 10, the fastening member 10 is separated from the first joined portion 21. is applied to the fastening member 10, the separation of the fastening member 10 from the first joined portion 21 is suppressed.
特に、かしめ部１５は、軸部１２の周方向に沿って環状に形成される。そのため、第一実施形態は、例えば、複数の点接触部でナットと第１の被接合部２１が接合されるプロジェクション溶接と比べて、締結部材１０の剥離強度を高めることができる。 In particular, the crimped portion 15 is annularly formed along the circumferential direction of the shaft portion 12 . Therefore, the first embodiment can increase the peel strength of the fastening member 10, for example, compared to projection welding in which the nut and the first welded portion 21 are joined at a plurality of point contact portions.
また、第一実施形態によれば、継手の製造方法（図３Ａ、及び図３Ｂ参照）の第二工程において、第１の被接合部２１が溶融しない加熱温度で、一対の電極４０によって締結部材１０を通電加熱しながら加圧し、軸部１２の先端を潰す。つまり、この第二工程では、プロジェクション溶接よりも第１の被接合部２１の加熱温度が低いかしめ加工の条件の下で、締結部材１０を通電加熱しながら加圧する。したがって、第１の被接合部２１は溶融しないので、第１の被接合部２１に水素脆化が生じることが抑制される。これにより、第１の被接合部２１、及び接合継手３０の品質を確保することができる。 Further, according to the first embodiment, in the second step of the joint manufacturing method (see FIGS. 3A and 3B), the pair of electrodes 40 is used to heat the fastening member at a heating temperature at which the first welded portion 21 does not melt. 10 is pressurized while being energized and heated, and the tip of the shaft portion 12 is crushed. That is, in the second step, the fastening member 10 is electrically heated and pressurized under the crimping condition in which the heating temperature of the first welded portion 21 is lower than that in projection welding. Therefore, since the first welded portion 21 does not melt, hydrogen embrittlement in the first welded portion 21 is suppressed. Thereby, the quality of the first welded portion 21 and the welded joint 30 can be ensured.
また、締結部材１０は、フランジ１１と、フランジ１１の軸方向一方側の端部から突出する軸部１２とを備えている。この締結部材１０のネジ穴１３は、軸部１２に形成されておらず、フランジ１１にのみ形成されている。したがって、継手の製造方法（図２Ａ、及び図２Ｂ参照）の第二工程において、軸部１２の先端を潰してかしめ部１５を形成する際に、ネジ穴１３が変形し難くなる。しかも、上述の通り、第二工程では、第１の被接合部２１は溶融しないので、ネジ穴１３にスパッタが付着することが抑制される。以上により、ネジ穴１３にボルト６０の雄ネジ部６３がねじ込み難くなることが抑制される。 The fastening member 10 also includes a flange 11 and a shaft portion 12 protruding from one axial end of the flange 11 . The screw hole 13 of this fastening member 10 is not formed in the shaft portion 12 but is formed only in the flange 11 . Therefore, in the second step of the joint manufacturing method (see FIGS. 2A and 2B), when the tip of the shaft portion 12 is crushed to form the caulked portion 15, the screw hole 13 is less likely to deform. Moreover, as described above, in the second step, since the first part to be joined 21 is not melted, adhesion of spatter to the screw hole 13 is suppressed. As described above, it is possible to prevent the male screw portion 63 of the bolt 60 from being difficult to be screwed into the screw hole 13 .
また、継手の製造方法の第二工程において、潰される軸部１２の先端は、ネジ穴１３を有するフランジ１１から離れた位置にあるので、ネジ穴１３の変形がさらに抑制される。しかも、フランジ１１の肉厚が、軸部１２の肉厚よりも厚いので、一対の電極４０で通電しながら締結部材１０を加圧したときに、フランジ１１の電流密度が、軸部１２の電流密度よりも低くなる。そのため、フランジ１１は、軸部１２に比べて、温度が上がらないので、フランジ１１のネジ穴１３の変形がさらに抑制される。なお、フランジ１１の肉厚は、軸部１２の肉厚の例えば、１．５倍以上が好適である。 Further, in the second step of the joint manufacturing method, the tip of the shaft portion 12 that is crushed is located away from the flange 11 having the screw hole 13, so deformation of the screw hole 13 is further suppressed. Moreover, since the thickness of the flange 11 is thicker than the thickness of the shaft portion 12, when the fastening member 10 is pressurized while the pair of electrodes 40 is energized, the current density of the flange 11 is greater than the current density of the shaft portion 12. lower than density. Therefore, the temperature of the flange 11 does not rise as compared with the shaft portion 12, so that the deformation of the screw hole 13 of the flange 11 is further suppressed. The thickness of the flange 11 is preferably 1.5 times or more the thickness of the shaft portion 12, for example.
このように、第一実施形態では、締結部材１０の剥離、及び締結部材１０のネジ穴１３にボルト６０の雄ネジ部６３がねじ込み難くなることを抑制すると共に、第１の板材２０と第２の板材５０とを適切に接合することができる。 As described above, in the first embodiment, separation of the fastening member 10 and difficulty in screwing the male threaded portion 63 of the bolt 60 into the screw hole 13 of the fastening member 10 are suppressed, and the first plate member 20 and the second plate member 20 are prevented from can be properly joined to the plate material 50 of
また、第一実施形態では、第１の被接合部２１の貫通穴２２は、断面が円形状の丸穴である。そのため、例えば、板材接合構造７０が自動車の車体パネルの接合構造に適用された場合に、ボルト６０及び締結部材１０を通じて第１の被接合部２１に荷重が作用しても、貫通穴２２の周囲部の一部に、応力が集中することを抑制することができる。 Further, in the first embodiment, the through hole 22 of the first joined portion 21 is a round hole having a circular cross section. Therefore, for example, when the plate material joining structure 70 is applied to the joining structure of the vehicle body panel of an automobile, even if a load acts on the first joined portion 21 through the bolt 60 and the fastening member 10, the circumference of the through hole 22 is It is possible to suppress concentration of stress on a part of the portion.
続いて、第一実施形態と比較例との比較について説明する。 Next, a comparison between the first embodiment and a comparative example will be described.
（第一比較例との比較）
図１１Ａ、及び図１１Ｂは、第一比較例に係るナット１１０を示す図である。図１１Ａは、ナット１１０の正面図である。図１１Ｂは、ナット１１０の縦断面図である。(Comparison with the first comparative example)
11A and 11B are diagrams showing a nut 110 according to a first comparative example. 11A is a front view of nut 110. FIG. 11B is a vertical cross-sectional view of nut 110. FIG.
第一比較例に係るナット１１０は、プロジェクション溶接装置によって板材に接合されるプロジェクションナットである。このナット１１０の軸方向一方側の端部には、複数の凸部１１５が形成されている。複数の凸部１１５は、ナット１１０の周方向に間隔を空けて配置されている。 A nut 110 according to the first comparative example is a projection nut that is joined to a plate material by a projection welding device. A plurality of projections 115 are formed at one end of the nut 110 in the axial direction. The plurality of protrusions 115 are arranged at intervals in the circumferential direction of the nut 110 .
図１２Ａ、及び図１２Ｂは、第一比較例に係る継手の製造方法を説明する図である。図１２Ａは、継手の製造方法の第一工程を説明する図である。図１２Ｂは、継手の製造方法の第二工程を説明する図である。 12A and 12B are diagrams illustrating a method of manufacturing a joint according to the first comparative example. FIG. 12A is a diagram illustrating the first step of the joint manufacturing method. FIG. 12B is a diagram explaining the second step of the joint manufacturing method.
第一比較例に係る継手の製造方法では、第一工程において、ナット１１０が板材１５０の被接合部１５１の上にセットされる。次いで、第二工程において、一対の電極１６０によって被接合部１５１及びナット１１０を挟んだ状態で、一対の電極１６０間が通電される。 In the joint manufacturing method according to the first comparative example, the nut 110 is set on the joined portion 151 of the plate member 150 in the first step. Next, in the second step, the pair of electrodes 160 is energized with the joined portion 151 and the nut 110 sandwiched between the pair of electrodes 160 .
そして、複数の凸部１１５と被接合部１５１との複数の点接触部で、ナット１１０及び被接合部１５１がプロジェクション溶接により接合される。このプロジェクション溶接により、ナット１１０と被接合部１５１との接合部には、複数の溶接部１１６が形成される。第一比較例に係る継手の製造方法では、以上の要領で、ナット１１０及び被接合部１５１を有する接合継手が得られる。 The nut 110 and the joined portion 151 are joined by projection welding at the plurality of point contact portions between the plurality of convex portions 115 and the joined portion 151 . A plurality of welded portions 116 are formed at the joint portion between the nut 110 and the joint portion 151 by this projection welding. In the joint manufacturing method according to the first comparative example, a joined joint having the nut 110 and the joined portion 151 is obtained in the manner described above.
しかしながら、第一比較例では、ナット１１０の周方向の全長に亘ってナット１１０と被接合部１５１とが溶接で接合されず、ナット１１０に形成された複数の凸部１１５と被接合部１５１との複数の点接触部が、プロジェクション溶接により接合される。このため、ボルトがナット１１０に押し込まれる際に、ナット１１０に作用する押し込み荷重に対して、ナット１１０の剥離強度が不足する虞がある。 However, in the first comparative example, the nut 110 and the joined portion 151 are not joined by welding over the entire circumferential length of the nut 110, and the plurality of convex portions 115 formed on the nut 110 and the joined portion 151 are not joined together. are joined by projection welding. Therefore, when the bolt is pushed into the nut 110 , there is a possibility that the peel strength of the nut 110 may be insufficient with respect to the pushing load acting on the nut 110 .
第一比較例では、特に、板材１５０の鋼板強度が高くなると、溶接部１１６の靱性が低下するため、ナット１１０の剥離強度が不足する虞が高くなる。また、鋼板強度が高くなると、溶接部１１６が硬くなるため、溶接部１１６に水素脆化が生じる虞がある。 In the first comparative example, particularly when the steel plate strength of the plate material 150 increases, the toughness of the welded portion 116 decreases, so the possibility of insufficient peel strength of the nut 110 increases. In addition, when the strength of the steel plate increases, the welded portion 116 becomes hard, and hydrogen embrittlement may occur in the welded portion 116 .
また、第一比較例では、複数の凸部１１５と第１の被接合部２１との複数の点接触部の加熱温度が高くなると共に加圧時間が長くなると、次のようになる。すなわち、溶接部１１６が硬くなると共に、複数の点接触部に形成される複数の溶接部１１６に、大気中、又は第１の板材１５０の表面の防錆油から水素が侵入しやすくなる。そのため、第１の板材１５０が高強度鋼板の場合は、水素脆化が生じる可能性が高くなる。特に、１．５ＧＰａ級を超える高強度鋼板では、水素脆化の問題が顕在化する。 In addition, in the first comparative example, when the heating temperature of the plurality of point contact portions between the plurality of convex portions 115 and the first to-be-bonded portion 21 increases and the pressing time increases, the following occurs. That is, as the welded portion 116 becomes harder, the plurality of welded portions 116 formed at the plurality of point contact portions are more likely to be penetrated by hydrogen from the atmosphere or from the rust preventive oil on the surface of the first plate member 150 . Therefore, when the first plate material 150 is a high-strength steel plate, hydrogen embrittlement is likely to occur. In particular, the problem of hydrogen embrittlement becomes apparent in high-strength steel sheets exceeding 1.5 GPa class.
ここで、水素脆化の影響を小さくするために、溶接部１１６の大きさを小さくすることが考えられる。しかしながら、この場合には、ナット１１０の剥離強度が低下する。一方、ナット１１０の剥離強度を向上させるために、溶接部１１６の大きさを大きくすることが考えられる。しかしながら、この場合には、水素脆化の影響が大きくなる。すなわち、剥離強度と水素脆化とは、トレードオフの関係にある。 Here, in order to reduce the influence of hydrogen embrittlement, it is conceivable to reduce the size of the welded portion 116 . However, in this case, the peel strength of nut 110 is reduced. On the other hand, in order to improve the peel strength of nut 110, it is conceivable to increase the size of welded portion 116. FIG. However, in this case, the influence of hydrogen embrittlement increases. That is, there is a trade-off relationship between peel strength and hydrogen embrittlement.
これに対して、第一実施形態（図１Ａ、図１Ｂ、図２Ａ、及び図２Ｂ参照）では、一対の電極４０によって締結部材１０を通電加熱しながら加圧して、軸部１２の先端を潰す。これにより、軸部１２の先端部に、第二板面２１Ｂにおける貫通穴２２の周囲部に圧着されるかしめ部１５を形成する。このかしめ部１５は、軸部１２の周方向に沿って環状に形成され、貫通穴２２の周囲部に引っ掛かる抜止部として機能する。したがって、第一実施形態は、第一比較例に係るプロジェクション溶接と比べて、締結部材１０の剥離強度を高めることができる。また、第１の被接合部２１は溶融しないので、第１の被接合部２１を含む第１の板材２０が高強度鋼板の場合でも、第１の被接合部２１の靱性が低下しにくい。すなわち、第一実施形態は、高強度鋼板においても、高い効果を得ることができる。 On the other hand, in the first embodiment (see FIGS. 1A, 1B, 2A, and 2B), the fastening member 10 is pressurized while being energized and heated by the pair of electrodes 40, and the tip of the shaft portion 12 is crushed. . As a result, a crimped portion 15 is formed at the distal end portion of the shaft portion 12 so as to be crimped to the peripheral portion of the through hole 22 in the second plate surface 21B. The crimped portion 15 is formed in an annular shape along the circumferential direction of the shaft portion 12 and functions as a retaining portion that is hooked to the peripheral portion of the through hole 22 . Therefore, the first embodiment can increase the peel strength of the fastening member 10 compared to the projection welding according to the first comparative example. Further, since the first jointed portion 21 does not melt, even if the first plate material 20 including the first jointed portion 21 is a high-strength steel plate, the toughness of the first jointed portion 21 is less likely to decrease. That is, the first embodiment can obtain high effects even in high-strength steel sheets.
また、第一実施形態は、第１の被接合部２１が溶融しない加熱温度で、一対の電極４０によって締結部材１０を通電加熱しながら加圧する。つまり、第一実施形態では、プロジェクション溶接よりも第１の被接合部２１の加熱温度が低いかしめ加工の条件の下で、締結部材１０を通電加熱しながら加圧する。したがって、第１の被接合部２１は溶融しないので、第１の被接合部２１に水素脆化が生じることが抑制される。特に、第一実施形態は、１．５ＧＰａ級を超える高強度鋼板において、水素脆化を抑制することができるので、高強度鋼板において、高い効果を得ることができる。 Further, in the first embodiment, the fastening member 10 is pressurized while being electrically heated by the pair of electrodes 40 at a heating temperature at which the first joined portion 21 is not melted. That is, in the first embodiment, the fastening member 10 is electrically heated and pressurized under the crimping condition in which the heating temperature of the first welded portion 21 is lower than that in projection welding. Therefore, since the first welded portion 21 does not melt, hydrogen embrittlement in the first welded portion 21 is suppressed. In particular, since the first embodiment can suppress hydrogen embrittlement in high-strength steel sheets exceeding 1.5 GPa class, high effects can be obtained in high-strength steel sheets.
このように、第一実施形態は、剥離強度の向上と水素脆化の抑制とを両立させることができる。 Thus, the first embodiment can achieve both improvement in peel strength and suppression of hydrogen embrittlement.
（第二比較例、及び第三比較例との比較）
図１３Ａ、及び図１３Ｂは、第二比較例に係るナット１２０及び接合継手を示す図である。図１３Ａは、ナット１２０の縦断面図である。図１３Ｂは、接合継手の縦断面図である。(Comparison with second comparative example and third comparative example)
13A and 13B are diagrams showing a nut 120 and a joining joint according to a second comparative example. 13A is a vertical cross-sectional view of nut 120. FIG. FIG. 13B is a longitudinal cross-sectional view of a bonded joint.
第二比較例に係るナット１２０は、ナット本体１２１の軸方向一方側の端部に内筒１２２と外壁１２５（外筒）を有するピアスナットである。この第二比較例では、板材１５０にセットされたナット１２０を打込工具で打込む。これにより、内筒１２２によって板材１５０の一部が打ち抜かれ、板材１５０に穴１５２が形成される。この穴１５２に内筒１２２が挿入されると共に、穴１５２の周囲部が内筒１２２と外壁１２５との間でかしめられることにより、板材１５０にナット１２０が固定される。 A nut 120 according to a second comparative example is a pierce nut having an inner cylinder 122 and an outer wall 125 (outer cylinder) at one axial end of a nut body 121 . In this second comparative example, a nut 120 set on a plate member 150 is driven by a driving tool. As a result, a portion of the plate material 150 is punched out by the inner cylinder 122 and a hole 152 is formed in the plate material 150 . The nut 120 is fixed to the plate member 150 by inserting the inner cylinder 122 into the hole 152 and crimping the periphery of the hole 152 between the inner cylinder 122 and the outer wall 125 .
しかしながら、第二比較例では、ナット本体１２１から内筒１２２に亘ってネジ穴１２３が形成されている。したがって、打ち込まれたナット１２０の内筒１２２によって、板材１５０の一部を打ち抜く際に、内筒１２２が変形するとともに、当該内筒１２２の変形に伴ってネジ穴１２３も変形する虞がある。 However, in the second comparative example, a screw hole 123 is formed from the nut body 121 to the inner cylinder 122 . Therefore, when part of the plate material 150 is punched out by the driven inner cylinder 122 of the nut 120 , the inner cylinder 122 may be deformed, and the screw hole 123 may be deformed along with the deformation of the inner cylinder 122 .
また、第二比較例は、冷間で板材１５０にナット１２０を打ち込むので、高強度鋼板への適用が困難である。 In addition, in the second comparative example, since the nut 120 is driven into the plate material 150 in the cold, it is difficult to apply to a high-strength steel plate.
図１４Ａ、及び図１４Ｂは、第三比較例に係るナット１３０及び接合継手を示す図である。図１４Ａは、ナット１３０の縦断面図である。図１４Ｂは、接合継手の縦断面図である。 14A and 14B are diagrams showing a nut 130 and a joining joint according to a third comparative example. 14A is a vertical cross-sectional view of nut 130. FIG. FIG. 14B is a longitudinal cross-sectional view of a bonded joint.
第三比較例に係るナット１３０は、外壁１２５が凸部である以外は、第二比較例に係るナット１２０（図１３Ａ、及び図１３Ｂ参照）と同様の構成である。第三比較例において、第二比較例と同様の構成については、同一の符号を用いている。 The nut 130 according to the third comparative example has the same configuration as the nut 120 according to the second comparative example (see FIGS. 13A and 13B), except that the outer wall 125 is a convex portion. In the third comparative example, the same reference numerals are used for the same configurations as in the second comparative example.
第三比較例に係るナット１３０においても、ナット本体１２１から内筒１２２に亘ってネジ穴１２３が形成されている。したがって、打ち込まれたナット１３０の内筒１２２によって、板材１５０の一部を打ち抜く際に、内筒１２２が変形するとともに、当該内筒１２２の変形に伴ってネジ穴１２３も変形する虞がある。 A screw hole 123 is also formed in the nut 130 according to the third comparative example from the nut body 121 to the inner cylinder 122 . Therefore, when part of the plate material 150 is punched out by the driven inner cylinder 122 of the nut 130 , the inner cylinder 122 may be deformed, and the screw hole 123 may be deformed along with the deformation of the inner cylinder 122 .
また、第三比較例においても、冷間で板材１５０にナット１３０を打ち込むので、高強度鋼板への適用が困難である。 Also, in the third comparative example, since the nut 130 is driven into the plate material 150 in the cold, it is difficult to apply to a high-strength steel plate.
これに対し、第一実施形態（図１Ａ、図１Ｂ、図２Ａ、及び図２Ｂ参照）に係る締結部材１０は、フランジ１１と、フランジ１１の軸方向一方側の端部から突出する軸部１２とを備えている。締結部材１０のネジ穴１３は、軸部１２に形成されておらず、フランジ１１にのみ形成されている。したがって、継手の製造方法の第二工程において、軸部１２の先端を潰してかしめ部１５を形成しても、ネジ穴１３の変形が抑制される。 On the other hand, the fastening member 10 according to the first embodiment (see FIGS. 1A, 1B, 2A, and 2B) includes a flange 11 and a shaft portion 12 protruding from one end of the flange 11 in the axial direction. and The screw hole 13 of the fastening member 10 is not formed in the shaft portion 12 but is formed only in the flange 11 . Therefore, even if the tip of the shaft portion 12 is crushed to form the caulked portion 15 in the second step of the joint manufacturing method, deformation of the screw hole 13 is suppressed.
また、第一実施形態では、軸部１２の先端を潰して締結部材１０を第１の板材２０に固定するので、高強度鋼板への適用が可能である。 Further, in the first embodiment, since the fastening member 10 is fixed to the first plate material 20 by crushing the tip of the shaft portion 12, application to high-strength steel plates is possible.
（第四比較例との比較）
図１５Ａ、及び図１５Ｂは、第四比較例に係る継手の製造方法を示す図である。図１５Ａは、継手の製造方法の第一工程を説明する図である。図１５Ｂは、継手の製造方法の第二工程を説明する図である。(Comparison with the fourth comparative example)
15A and 15B are diagrams showing a method of manufacturing a joint according to the fourth comparative example. FIG. 15A is a diagram explaining the first step of the joint manufacturing method. FIG. 15B is a diagram explaining the second step of the joint manufacturing method.
第四比較例では、フランジ部１４１と胴部１４２を有するナット１４０、すなわち、かしめナットが用いられている。この第四比較例では、板材１５０の穴１５２にナット１４０の胴部１４２が挿入された状態で、当該胴部１４２を軸方向に潰すことにより、環状のかしめ変形部１４５が胴部１４２に形成される。これらのナット１４０のフランジ部１４１及びかしめ変形部１４５によって板材１５０を挟んだ状態で、板材１５０にナット１４０が固定される。 In the fourth comparative example, a nut 140 having a flange portion 141 and a body portion 142, that is, a caulking nut is used. In this fourth comparative example, an annular caulking deformed portion 145 is formed in the body portion 142 by crushing the body portion 142 in the axial direction while the body portion 142 of the nut 140 is inserted into the hole 152 of the plate member 150. be done. The nut 140 is fixed to the plate member 150 in a state in which the plate member 150 is sandwiched between the flange portion 141 and the crimp deformation portion 145 of the nut 140 .
しかしながら、この第四比較例では、ナット１４０の胴部１４２にネジ穴１４３が形成されている。このネジ穴１４３にかしめ変形部１４５が隣接するため、胴部１４２にかしめ変形部１４５が形成される際に、ネジ穴１４３が変形する虞がある。 However, in this fourth comparative example, a threaded hole 143 is formed in the body portion 142 of the nut 140 . Since the crimping deformation portion 145 is adjacent to the screw hole 143 , there is a possibility that the screw hole 143 is deformed when the crimping deformation portion 145 is formed in the trunk portion 142 .
これに対し、第一実施形態（図１Ａ、図１Ｂ、図２Ａ、及び図２Ｂ参照）に係る締結部材１０は、フランジ１１と、フランジ１１の軸方向一方側の端部から突出する軸部１２とを備えている。この締結部材１０のネジ穴１３は、軸部１２に形成されておらず、フランジ１１にのみ形成されている。したがって、継手の製造方法の第二工程において、軸部１２の先端を潰してかしめ部１５を形成しても、ネジ穴１３の変形が抑制される。 On the other hand, the fastening member 10 according to the first embodiment (see FIGS. 1A, 1B, 2A, and 2B) includes a flange 11 and a shaft portion 12 protruding from one end of the flange 11 in the axial direction. and The screw hole 13 of this fastening member 10 is not formed in the shaft portion 12 but is formed only in the flange 11 . Therefore, even if the tip of the shaft portion 12 is crushed to form the caulked portion 15 in the second step of the joint manufacturing method, deformation of the screw hole 13 is suppressed.
特に、継手の製造方法の第二工程において、潰される軸部１２の先端は、ネジ穴１３を有するフランジ１１から離れた位置にある。そのため、第一実施形態は、第四比較例（図１５Ａ、及び図１５Ｂ参照）のようにネジ穴１３にかしめ変形部１４５が隣接する場合に比して、ネジ穴１３の変形が抑制される。 In particular, in the second step of the joint manufacturing method, the tip of the shank 12 to be crushed is located away from the flange 11 having the screw hole 13 . Therefore, in the first embodiment, deformation of the screw hole 13 is suppressed as compared with the case where the crimp deformation portion 145 is adjacent to the screw hole 13 as in the fourth comparative example (see FIGS. 15A and 15B). .
続いて、実施例について説明する。 Next, examples will be described.
第一実施形態（図１Ａ、図１Ｂ、図２Ａ、図２Ｂ、図３Ａ、及び図３Ｂ参照）を適用した実施例と、上述の第一比較例（図１１Ａ、図１１Ｂ、図１２Ａ、及び図１２Ｂ参照）を適用した比較例とを比較する。 An example to which the first embodiment (see FIGS. 1A, 1B, 2A, 2B, 3A, and 3B) is applied and the first comparative example described above (FIGS. 11A, 11B, 12A, and 12B) is applied.
実施例では、板材として、１．５ＧＰａ級亜鉛めっきホットスタンプ鋼板を用いた。板材の板厚は、２．０ｍｍである。実施例で用いた締結部材の形状は、雌ネジ部の外径が１６ｍｍ、雌ネジ部の長さが１０ｍｍ、ネジ穴の谷径（内径）が６ｍｍ（Ｍ６）、軸部の長さが８ｍｍ、軸部の外径が１４ｍｍ、軸部の貫通穴の径が８ｍｍ、軸部の肉厚が３ｍｍである。比較例では、ＪＩＳ Ｂ １１６３に記載の四角ナットを用いた。実施例で使用する一対の電極は、直径が１６ｍｍ、先端がフラット、材料がＣｕ－Ｃｒ合金の電極とした。プロジェクション溶接である比較例でも本実施例と同じ電極を用いた。 In the examples, a 1.5 GPa grade galvanized hot stamped steel sheet was used as the plate material. The plate thickness of the plate material is 2.0 mm. The shape of the fastening member used in the examples is as follows: the outer diameter of the female screw portion is 16 mm, the length of the female screw portion is 10 mm, the root diameter (inner diameter) of the screw hole is 6 mm (M6), and the length of the shaft portion is 8 mm. , the outer diameter of the shaft is 14 mm, the diameter of the through hole of the shaft is 8 mm, and the thickness of the shaft is 3 mm. In a comparative example, a square nut described in JIS B 1163 was used. A pair of electrodes used in the examples had a diameter of 16 mm, a flat tip, and were made of a Cu—Cr alloy. The same electrodes as in this example were used in the comparative example, which is projection welding.
実施例では、かしめ加工に応じた電流を一対の電極間に流した。比較例では、プロジェクション溶接に応じた電流を一対の電極間に流した。実施例では、加圧力を３９２０Ｎ、通電時間を１０ｃｙｃｌｅ、保持時間を１０ｃｙｃｌｅ（１ｃｙcｌｅ＝１／６０秒）とした。比較例１では、一対の電極間に流す電流を１０．０ｋＡとし、比較例２では、一対の電極間に流す電流を１３．０ｋＡとした。 In the example, a current corresponding to caulking was applied between the pair of electrodes. In the comparative example, a current corresponding to projection welding was passed between a pair of electrodes. In the example, the applied pressure was 3920 N, the energization time was 10 cycles, and the holding time was 10 cycles (1 cycle=1/60 second). In Comparative Example 1, the current flowing between the pair of electrodes was 10.0 kA, and in Comparative Example 2, the current flowing between the pair of electrodes was 13.0 kA.
表１には、実施例、比較例１、及び比較例２の結果が示されている。評価項目は、「締結部材又はナットの剥離強度」と、「ボルトの螺入不良」とした。締結部材又はナットの剥離強度は、ＪＩＳ Ｂ １１９６付属書Ａで評価した。ボルトのねじ込み不良は、ボルトをナットにねじ込めるか否かで評価した。そして、ボルトをナットにねじ込めた場合を「無し」とし、ボルトをナットにねじ込めない場合を「有り」とした。 Table 1 shows the results of Example, Comparative Example 1, and Comparative Example 2. Evaluation items were "peel strength of fastening member or nut" and "failure to screw in bolt". The peel strength of the fastening member or nut was evaluated according to JIS B 1196 Annex A. The screwing failure of the bolt was evaluated by whether or not the bolt could be screwed into the nut. The case where the bolt was screwed into the nut was evaluated as "no", and the case where the bolt could not be screwed into the nut was evaluated as "yes".
表１に示されるように、比較例１では、ボルトのねじ込み不良が「無し」となったが、一対の電極間に流す電流を小さくしたため、点接触部の溶融径が小さくなり、ナットの剥離強度が低くなった。また、比較例２では、ナットの剥離強度は高かったが、一対の電極間に流す電流を大きくしたため、スパッタが発生した。この結果、スパッタがナットのネジ穴に付着し、ボルトのねじ込み不良が「有り」となった。一方、実施例では、締結部材の高い剥離強度が得られると共に、ボルトのねじ込み不良が「無し」となった。また、比較例１，２において、１．５ＧＰａ級亜鉛めっきホットスタンプ鋼板の代わりに、引張強度が２．０ＧＰａ以上の鋼板を用いた場合では、水素脆化割れが発生することがあった。これに対し、実施例において、１．５ＧＰａ級亜鉛めっきホットスタンプ鋼板の代わりに、引張強度が２．０ＧＰａ以上の鋼板を用いた場合では、水素脆化割れは認められなかった。 As shown in Table 1, in Comparative Example 1, there was no screwing failure of the bolt, but since the current flowing between the pair of electrodes was reduced, the diameter of the melted point contact portion became smaller, and the nut peeled off. decreased strength. In Comparative Example 2, although the peel strength of the nut was high, the current flowing between the pair of electrodes was increased, so that spatter was generated. As a result, the spatter adhered to the screw hole of the nut, and the screwing failure of the bolt was judged to be "yes". On the other hand, in the example, a high peel strength of the fastening member was obtained, and the screwing failure of the bolt was "absent". In addition, in Comparative Examples 1 and 2, hydrogen embrittlement cracking sometimes occurred when a steel sheet having a tensile strength of 2.0 GPa or more was used instead of the 1.5 GPa grade galvanized hot stamped steel sheet. On the other hand, in the example, when a steel sheet having a tensile strength of 2.0 GPa or more was used instead of the 1.5 GPa grade galvanized hot stamped steel sheet, hydrogen embrittlement cracking was not observed.
続いて、第一実施形態の変形例について説明する。 Next, a modified example of the first embodiment will be described.
上記第一実施形態では、好ましい例として、第１の板材２０が鋼板とされ、締結部材１０が金属製とされている。しかし、第１の板材２０は鋼板以外でもよい。また、締結部材１０は、金属製以外でもよい。 In the first embodiment described above, as a preferred example, the first plate member 20 is a steel plate, and the fastening member 10 is made of metal. However, the first plate member 20 may be other than a steel plate. Moreover, the fastening member 10 may be made of a material other than metal.
また、例えば、第１の板材２０及び締結部材１０は、樹脂製でもよい。第１の板材２０及び締結部材１０が樹脂製の場合には、一対の電極４０の代わりに、例えばヒータ等の加熱機能を有する一対の加熱加圧部材を用いて、締結部材１０を加熱しながら加圧すればよい。 Further, for example, the first plate member 20 and the fastening member 10 may be made of resin. When the first plate member 20 and the fastening member 10 are made of resin, instead of the pair of electrodes 40, for example, a pair of heating and pressurizing members having a heating function such as a heater are used to heat the fastening member 10. pressurize it.
また、上記第一実施形態では、第１の被接合部２１の第二板面２１Ｂに第２の被接合部５１が重ね合わされ、これらの第１の被接合部２１及び第２の被接合部５１が締結部材１０及びボルト６０によって接合される。しかし、第１の被接合部２１の第一板面２１Ａに第２の被接合部５１が重ね合わされ、これらの第１の被接合部２１及び第２の被接合部５１が締結部材１０及びボルト６０によって接合されてもよい。 Further, in the first embodiment, the second part to be joined 51 is superimposed on the second plate surface 21B of the first part to be joined 21, and the first part to be joined 21 and the second part to be joined are 51 are joined by the fastening member 10 and the bolt 60 . However, the second part to be joined 51 is superimposed on the first plate surface 21A of the first part to be joined 21, and the first part to be joined 21 and the second part to be joined 51 are connected to the fastening member 10 and the bolt. 60 may be joined.
また、上記第一実施形態では、貫通穴１４及びネジ穴１３の境界と、軸部１２及びフランジ１１の境界との位置が、軸方向で一致している。しかし、貫通穴１４及びネジ穴１３の境界と、軸部１２及びフランジ１１の境界との軸方向の位置は、例えば、第１の板材２０の板厚分程度ずれてもよい。 Further, in the first embodiment described above, the positions of the boundary between the through hole 14 and the screw hole 13 and the boundary between the shaft portion 12 and the flange 11 coincide in the axial direction. However, the axial position of the boundary between the through hole 14 and the screw hole 13 and the boundary between the shaft portion 12 and the flange 11 may be offset by the thickness of the first plate member 20, for example.
［第二実施形態］
次に、第二実施形態について説明する。[Second embodiment]
Next, a second embodiment will be described.
図４Ａ、及び図４Ｂは、第二実施形態に係る継手の製造方法を説明する図である。図４Ａは、継手の製造方法の第一工程を説明する図である。図４Ｂは、継手の製造方法の第二工程を説明する図である。 4A and 4B are diagrams illustrating a method for manufacturing a joint according to the second embodiment. FIG. 4A is a diagram explaining the first step of the joint manufacturing method. FIG. 4B is a diagram for explaining the second step of the joint manufacturing method.
第二実施形態では、上述の第一実施形態に対し、第１の被接合部２１の構成が次のように変更されている。すなわち、第１の被接合部２１は、膨出部２３を有する。膨出部２３は、第１の板材２０の平坦部２４に対して第一板面２１Ａ側に膨出する。膨出部２３の頂部には、貫通穴２２が形成されている。膨出部２３は、電極４０と干渉しない程度の内径を有している。膨出部２３は、例えば、プレス成形により作製できる。 In the second embodiment, the configuration of the first joined portion 21 is changed as follows from the above-described first embodiment. That is, the first joined portion 21 has a bulging portion 23 . The bulging portion 23 bulges toward the first plate surface 21A with respect to the flat portion 24 of the first plate member 20 . A through hole 22 is formed at the top of the bulging portion 23 . The bulging portion 23 has an inner diameter that does not interfere with the electrode 40 . The bulging portion 23 can be produced, for example, by press molding.
第二実施形態に係る継手の製造方法では、上記第一実施形態と同様に、第一工程で締結部材１０の軸部１２を貫通穴２２に通し、第二工程で一対の電極４０によって締結部材１０を通電加熱しながら加圧する。 In the joint manufacturing method according to the second embodiment, as in the first embodiment, the shaft portion 12 of the fastening member 10 is passed through the through hole 22 in the first step, and the fastening member is inserted by the pair of electrodes 40 in the second step. 10 is pressurized while being energized and heated.
ただし、第二実施形態に係る継手の製造方法では、第二工程において、一対の電極４０で締結部材１０を通電加熱しながら加圧する。これにより、膨出部２３の頂部に対する軸部１２の先端の突出高さｈ２が、第二板面２１Ｂにおいて膨出部２３の頂部と平坦部２４との間に形成された段差の高さｈ１よりも低くなるように、軸部１２の先端を潰す。すなわち、第二工程において、一対の電極４０で締結部材１０を通電加熱しながら加圧することによって、軸部１２が膨出部２３内に収まるように、軸部１２の先端を潰す。これにより、軸部１２の先端が、平坦部２４よりも突出することが抑制される。 However, in the joint manufacturing method according to the second embodiment, in the second step, the fastening member 10 is pressurized while being electrically heated by the pair of electrodes 40 . As a result, the protrusion height h2 of the tip of the shaft portion 12 with respect to the top of the bulging portion 23 is equal to the height h1 of the step formed between the top of the bulging portion 23 and the flat portion 24 on the second plate surface 21B. The tip of the shaft portion 12 is crushed so as to be lower than the . That is, in the second step, the tip of the shaft portion 12 is crushed so that the shaft portion 12 is accommodated in the bulging portion 23 by pressurizing the fastening member 10 while being electrically heated by the pair of electrodes 40 . This prevents the tip of the shaft portion 12 from protruding beyond the flat portion 24 .
図５Ａ、及び図５Ｂは、第二実施形態に係る板材接合方法を説明する図である。図５Ａは、板材接合方法の第一工程を説明する図である。図５Ｂは、板材接合方法の第二工程を説明する図である。 FIG. 5A and FIG. 5B are diagrams for explaining the plate material joining method according to the second embodiment. FIG. 5A is a diagram for explaining the first step of the method for joining plate materials. FIG. 5B is a diagram for explaining the second step of the method for joining plate materials.
第２の被接合部５１は、一例として、平坦に形成されている。そして、第二実施形態に係る板材接合方法では、上記第一実施形態と同様に、第２の被接合部５１側からボルト６０の雄ネジ部６３を貫通穴５２に通す。そして、ボルト６０の雄ネジ部６３を締結部材１０のネジ穴１３にねじ込むことにより、第１の被接合部２１及び第２の被接合部５１を接合する。 As an example, the second joined portion 51 is formed flat. Then, in the plate member joining method according to the second embodiment, the male threaded portion 63 of the bolt 60 is passed through the through hole 52 from the second joined portion 51 side, as in the first embodiment. Then, by screwing the male threaded portion 63 of the bolt 60 into the screw hole 13 of the fastening member 10, the first joined portion 21 and the second joined portion 51 are joined.
第二実施形態によれば、膨出部２３の頂部に対する軸部１２の先端の突出高さｈ２が、第二板面２１Ｂにおいて膨出部２３の頂部と平坦部２４との間に形成された段差の高さｈ１よりも低い。そのため、軸部１２の先端が、平坦部２４よりも突出することが抑制される。したがって、軸部１２の先端が第２の被接合部５１に干渉することが抑制されるので、第２の被接合部５１を平坦な形状にすることができる。これにより、第２の被接合部５１を含む第２の板材５０の形状の自由度を向上させることができる。 According to the second embodiment, the projection height h2 of the tip of the shaft portion 12 with respect to the top of the bulging portion 23 is formed between the top of the bulging portion 23 and the flat portion 24 on the second plate surface 21B. It is lower than the step height h1. Therefore, the tip of the shaft portion 12 is suppressed from protruding beyond the flat portion 24 . Therefore, the tip of the shaft portion 12 is prevented from interfering with the second joined portion 51, so that the second joined portion 51 can be made flat. Thereby, the flexibility of the shape of the second plate member 50 including the second to-be-joined portion 51 can be improved.
［第三実施形態］
次に、第三実施形態について説明する。[Third Embodiment]
Next, a third embodiment will be described.
図６Ａ、及び図６Ｂは、第三実施形態に係る締結部材１０を示す図である。図６Ａは、締結部材１０の正面図である。図６Ｂは、締結部材１０の縦断面図である。 6A and 6B are diagrams showing the fastening member 10 according to the third embodiment. 6A is a front view of the fastening member 10. FIG. 6B is a vertical cross-sectional view of the fastening member 10. FIG.
第三実施形態では、上述の第一実施形態に対し、締結部材１０の構成が次のように変更されている。すなわち、軸部１２は、外周面にネジ山を有する雄ネジとされている。なお、軸部１２の外周面に形成されたネジ山以外の構成は、上述の第一実施形態と同様である。 In the third embodiment, the configuration of the fastening member 10 is changed as follows with respect to the above-described first embodiment. That is, the shaft portion 12 is a male screw having threads on its outer peripheral surface. The configuration other than the thread formed on the outer peripheral surface of the shaft portion 12 is the same as that of the above-described first embodiment.
図７Ａ、及び図７Ｂは、第三実施形態に係る継手の製造方法を説明する図である。図７Ａは、継手の製造方法の第一工程を説明する図である。図７Ｂは、継手の製造方法の第二工程を説明する図である。 7A and 7B are diagrams illustrating a method for manufacturing a joint according to the third embodiment. FIG. 7A is a diagram explaining the first step of the joint manufacturing method. FIG. 7B is a diagram for explaining the second step of the joint manufacturing method.
第三実施形態では、上述の第一実施形態に対し、第１の被接合部２１の構成が次のように変更されている。すなわち、第１の被接合部２１に形成された貫通穴２２は、内周面にネジ溝を有するネジ穴とされている。なお、貫通穴２２の内周面に形成されたネジ穴以外の構成は、上述の第一実施形態と同様である。 In the third embodiment, the configuration of the first joined portion 21 is changed as follows from the above-described first embodiment. That is, the through hole 22 formed in the first joined portion 21 is a screw hole having a screw groove on the inner peripheral surface. The configuration other than the screw holes formed on the inner peripheral surface of the through hole 22 is the same as that of the above-described first embodiment.
第三実施形態に係る継手の製造方法では、第一工程において、雄ネジである軸部１２をネジ穴である貫通穴２２にねじ込む。このとき、フランジ１１が第一板面２１Ａにおける貫通穴２２の周囲部に当接すると共に、軸部１２の先端が第１の被接合部２１の第二板面２１Ｂから突出するまで、雄ネジである軸部１２をネジ穴である貫通穴２２にねじ込む。 In the method for manufacturing a joint according to the third embodiment, in the first step, the shaft portion 12, which is a male screw, is screwed into the through hole 22, which is a screw hole. At this time, the flange 11 abuts on the peripheral portion of the through hole 22 in the first plate surface 21A, and the tip of the shaft portion 12 protrudes from the second plate surface 21B of the first joined portion 21 with the male screw. A shaft portion 12 is screwed into a through hole 22 which is a screw hole.
次いで、第二工程において、一対の電極４０によって締結部材１０を通電加熱しながら加圧する。このとき、軸部１２の先端に、第二板面２１Ｂにおける貫通穴２２の周囲部に圧着するかしめ部１５を形成することは、第一実施形態と同様である。これにより、フランジ１１及びかしめ部１５によって、第１の被接合部２１を挟んだ状態で、第１の被接合部２１に締結部材１０が固定される。 Next, in the second step, the fastening member 10 is pressurized while being electrically heated by the pair of electrodes 40 . At this time, forming the caulked portion 15 that is crimped to the peripheral portion of the through hole 22 in the second plate surface 21B at the tip of the shaft portion 12 is the same as in the first embodiment. As a result, the fastening member 10 is fixed to the first jointed portion 21 with the first jointed portion 21 sandwiched between the flange 11 and the crimped portion 15 .
図８Ａ、及び図８Ｂは、第三実施形態に係る板材接合方法を説明する図である。図８Ａは、板材接合方法の第一工程を説明する図である。図８Ｂは、板材接合方法の第二工程を説明する図である。 FIG. 8A and FIG. 8B are diagrams for explaining the plate material joining method according to the third embodiment. FIG. 8A is a diagram for explaining the first step of the method for joining plate materials. FIG. 8B is a diagram for explaining the second step of the method for joining plate materials.
第三実施形態に係る板材接合方法では、上記第一実施形態と同様に、第２の被接合部５１側からボルト６０の雄ネジ部６３を貫通穴５２に通す。そして、雄ネジ部６３を締結部材１０のネジ穴１３にねじ込むことにより、第１の被接合部２１及び第２の被接合部５１を接合する。 In the plate member joining method according to the third embodiment, the male threaded portion 63 of the bolt 60 is passed through the through hole 52 from the second joined portion 51 side, as in the first embodiment. By screwing the male threaded portion 63 into the screw hole 13 of the fastening member 10, the first joined portion 21 and the second joined portion 51 are joined.
第三実施形態によれば、軸部１２は、雄ネジとされている。また、貫通穴２２は、ネジ穴とされている。雄ネジである軸部１２は、ネジ穴である貫通穴２２にねじ込まれている。また、締結部材１０は、軸部１２の先端にかしめ部１５が形成された状態では、第１の被接合部２１が、当該第１の被接合部２１の板厚方向の両側からフランジ１１及びかしめ部１５によって挟まれた状態になる。したがって、締結部材１０が、第１の被接合部２１に対して回転することが抑制される。 According to the third embodiment, the shaft portion 12 is a male thread. Also, the through hole 22 is a screw hole. The shaft portion 12, which is a male screw, is screwed into a through hole 22, which is a screw hole. Further, in the fastening member 10 in which the crimped portion 15 is formed at the tip of the shaft portion 12 , the first joint portion 21 extends from both sides of the first joint portion 21 in the plate thickness direction to the flange 11 and the crimped portion 15 . It will be sandwiched by the caulked portion 15 . Therefore, the fastening member 10 is suppressed from rotating with respect to the first joined portion 21 .
つまり、締結部材１０に回転力が作用した場合には、雄ネジである軸部１２とネジ穴である貫通穴２２とのネジ構造によって、締結部材１０に作用した回転力が締結部材１０の軸力に変換される。しかし、フランジ１１及びかしめ部１５によって、第１の被接合部２１を挟み込むことにより、締結部材１０の軸方向の移動が拘束される。このようにフランジ１１及びかしめ部１５によって締結部材１０の軸方向の移動を拘束すると、締結部材１０の回転も拘束される。これにより、締結部材１０が第１の被接合部２１に対して回転することが抑制される。 In other words, when a rotational force acts on the fastening member 10 , the rotational force acting on the fastening member 10 is transferred to the shaft of the fastening member 10 due to the screw structure of the shaft portion 12 that is a male screw and the through hole 22 that is a screw hole. converted to force. However, by sandwiching the first joined portion 21 between the flange 11 and the caulked portion 15, the axial movement of the fastening member 10 is restrained. When the axial movement of the fastening member 10 is restricted by the flange 11 and the caulked portion 15 in this way, the rotation of the fastening member 10 is also restricted. As a result, the fastening member 10 is prevented from rotating with respect to the first joined portion 21 .
［第四実施形態］
次に、本発明の第四実施形態について説明する。[Fourth embodiment]
Next, a fourth embodiment of the invention will be described.
図９は、第四実施形態に係る接合継手３０の分解斜視図である。第四実施形態では、上述の第一実施形態に対し、締結部材１０及び第１の被接合部２１の構成が次のように変更されている。 FIG. 9 is an exploded perspective view of the joining joint 30 according to the fourth embodiment. In the fourth embodiment, the configurations of the fastening member 10 and the first joined portion 21 are changed as follows from the above-described first embodiment.
すなわち、軸部１２は、多角筒とされている。また、貫通穴２２は、多角穴とされている。軸部１２の外周形状及び貫通穴２２の内周形状は、一例として、正六角形とされているが、正六角形以外の多角形状でもよい。また、軸部１２と貫通穴２２とで多角形状が異なっていてもよい。軸部１２は、貫通穴２２に係合される。つまり、軸部１２は、軸周りに回転不能に貫通穴２２に固定される。 That is, the shaft portion 12 is a polygonal tube. Also, the through hole 22 is a polygonal hole. The outer peripheral shape of the shaft portion 12 and the inner peripheral shape of the through hole 22 are, for example, regular hexagons, but may be polygonal shapes other than regular hexagons. Moreover, the polygonal shape may be different between the shaft portion 12 and the through hole 22 . The shaft portion 12 is engaged with the through hole 22 . That is, the shaft portion 12 is fixed to the through hole 22 so as not to be rotatable about the axis.
第四実施形態において、上記以外の構成は、第一実施形態と同様である。また、第四実施形態において、継手の製造方法及び板材接合方法は、第一実施形態と同様である。 In the fourth embodiment, configurations other than the above are the same as those in the first embodiment. In addition, in the fourth embodiment, the joint manufacturing method and the plate member joining method are the same as those in the first embodiment.
第四実施形態では、多角筒である軸部１２が、多角穴である貫通穴２２に係合されることにより、締結部材１０が第１の被接合部２１に対して回転することを防止することができる。 In the fourth embodiment, the shaft portion 12, which is a polygonal tube, is engaged with the through hole 22, which is a polygonal hole, thereby preventing the fastening member 10 from rotating with respect to the first joined portion 21. be able to.
なお、貫通穴２２は、八角形以下が望ましい。貫通穴２２の角の数が増えるに従って貫通穴２２が円形に近づき、締結部材１０の回転抑制効果が減少するためである。 In addition, the through hole 22 is desirably less than octagonal. This is because as the number of corners of the through hole 22 increases, the through hole 22 approaches a circular shape and the effect of suppressing the rotation of the fastening member 10 decreases.
また、第四実施形態では、多角筒である軸部１２が、多角穴である貫通穴２２に通される。しかし、例えば、円筒である軸部１２を、多角穴である貫通穴２２に通してもよい。この場合、一対の電極４０によって、軸部１２の先端を潰してかしめ部１５を形成する際に、貫通穴２２内において軸部１２が拡径し、貫通穴２２の内周面に係合される。これにより、締結部材１０が第１の板材２０に対して回転することを防止することができる。 Further, in the fourth embodiment, the shaft portion 12, which is a polygonal tube, is passed through the through hole 22, which is a polygonal hole. However, for example, the shaft portion 12, which is a cylinder, may be passed through the through hole 22, which is a polygonal hole. In this case, when the tip of the shaft portion 12 is crushed by the pair of electrodes 40 to form the caulked portion 15 , the diameter of the shaft portion 12 expands in the through hole 22 and is engaged with the inner peripheral surface of the through hole 22 . be. Thereby, the fastening member 10 can be prevented from rotating with respect to the first plate member 20 .
［第五実施形態］
次に、本発明の第五実施形態について説明する。[Fifth embodiment]
Next, a fifth embodiment of the invention will be described.
図１０Ａ、及び図１０Ｂは、第五実施形態に係る継手の製造方法を説明する図である。図１０Ａは、継手の製造方法の第一工程を説明する図である。図１０Ｂは、継手の製造方法の第二工程を説明する図である。 10A and 10B are diagrams illustrating a method for manufacturing a joint according to the fifth embodiment. FIG. 10A is a diagram explaining the first step of the joint manufacturing method. FIG. 10B is a diagram explaining the second step of the joint manufacturing method.
第五実施形態では、複数枚の第１の板材２０が重ねられている。また、複数枚の第１の板材２０の各々に、第１の被接合部２１が形成されている。そして、重ね合わされた複数枚の第１の被接合部２１に締結部材１０を固定することにより、複数枚の第１の被接合部２１と締結部材１０とを備える接合継手３０が製造される。 In the fifth embodiment, a plurality of first plate members 20 are stacked. Also, a first joint portion 21 is formed on each of the plurality of first plate members 20 . By fixing the fastening member 10 to the plurality of first to-be-joined portions 21 that are overlapped, the joint 30 including the plurality of first to-be-joined portions 21 and the fastening member 10 is manufactured.
なお、複数枚の第１の板材２０のうち少なくとも１枚は、引張強さが７８０ＭＰａ以上の鋼板であり、好ましくは、引張強さが９８０ＭＰａ以上の鋼板である。また、その鋼板の板厚は、例えば、０．５ｍｍ～４．０ｍｍである。なお、複数枚の第１の板材２０のうち少なくとも１枚は、表面処理鋼板でもよい。 At least one of the plurality of first plate members 20 is a steel plate with a tensile strength of 780 MPa or more, preferably a steel plate with a tensile strength of 980 MPa or more. Further, the plate thickness of the steel plate is, for example, 0.5 mm to 4.0 mm. At least one of the plurality of first plate members 20 may be a surface-treated steel plate.
第五実施形態のように、重ね合わされた複数枚の第１の被接合部２１に締結部材１０を固定する場合でも、第一実施形態と同様の作用及び効果を奏することができる。 Even when the fastening member 10 is fixed to a plurality of first joined portions 21 that are overlapped as in the fifth embodiment, the same functions and effects as in the first embodiment can be obtained.
以上、第一実施形態～第五実施形態について説明した。しかし、本願が開示する技術は、上記第一実施形態～第五実施形態に限定されるものでなく、その主旨を逸脱しない範囲内において、種々変形して実施可能であることは勿論である。 The first to fifth embodiments have been described above. However, the technology disclosed by the present application is not limited to the above-described first to fifth embodiments, and can of course be modified in various ways without departing from the gist thereof.
また、上記第一実施形態～第五実施形態のうち、組み合わせ可能な実施形態は、適宜組み合わされてもよい。 In addition, among the first to fifth embodiments, the combinable embodiments may be combined as appropriate.
また、２０２０年７月３日に出願された日本国特許出願２０２０－１１５８３３号の開示は、その全体が参照により本明細書に取り込まれる。
本明細書に記載された全ての文献、特許出願、及び技術規格は、個々の文献、特許出願、及び技術規格が参照により取り込まれることが具体的かつ個々に記された場合と同程度に、本明細書中に参照により取り込まれる。In addition, the disclosure of Japanese Patent Application No. 2020-115833 filed on July 3, 2020 is incorporated herein by reference in its entirety.
All publications, patent applications and technical standards mentioned herein are to the same extent as if each individual publication, patent application and technical standard were specifically and individually noted to be incorporated by reference. incorporated herein by reference.
なお、以上の実施形態に関し、さらに以下の付記を開示する。 In addition, the following additional remarks are disclosed regarding the above embodiment.
(付記１）
板材に形成された接合部にナットを固定して、前記接合部及び前記ナットを備える接合継手を得る接合継手の製造方法において、
前記ナットは、ネジ穴を有する雌ネジ部と、前記ネジ穴と同軸に形成された貫通穴を有し、前記雌ネジ部の軸方向一方側の端部から突出する軸部とを備え、前記雌ネジ部の外径は、前記軸部の外径より大きく、前記雌ネジ部の肉厚は、前記軸部の肉厚より厚く、
前記ナットを前記接合部に固定する工程として、
前記軸部を前記接合部に形成された通し穴に挿通して、前記雌ネジ部を前記接合部の第一板面に当接させると共に、前記軸部の先端部を前記接合部の第二板面から突出させる第一工程と、
前記ナットの軸方向両側から前記ナットを一対の加熱加圧部材で挟んだ状態で、前記一対の加熱加圧部材によって前記ナットを加熱しながら加圧することにより前記軸部の先端部をかしめて、前記軸部の先端部に前記第二板面における前記通し穴の周囲部に係止するかしめ部を形成する第二工程と、
を備える接合継手の製造方法。
(付記２）
前記通し穴は、ネジ穴であり、
前記軸部は、雄ネジであり、
前記第一工程において、前記軸部を前記通し穴に螺入する、
付記１に記載の接合継手の製造方法。
(付記３）
前記通し穴は、多角穴であり、
前記軸部は、多角筒であり、
前記第一工程において、前記軸部を前記通し穴に係合する、
付記１に記載の接合継手の製造方法。
(付記４）
前記接合部は、前記板材に形成された平坦部に対して前記第一板面の側に膨出し、頂部に前記通し穴が形成された膨出部を有する、
付記１～付記３のいずれか一つに記載の接合継手の製造方法。
(付記５）
前記第二工程において、前記一対の加熱加圧部材で前記ナットを加熱しながら加圧することによって、前記膨出部の頂部に対する前記軸部の先端部の突出高さが、前記膨出部の頂部と前記平坦部との間で前記第二板面に形成された段差の高さよりも低くなるように、前記軸部の先端部をかしめる、
付記４に記載の接合継手の製造方法。
(付記６）
前記ナットは、金属製であり、
前記板材は、引張強さが７８０ＭＰａ以上の鋼板であり、
前記加熱加圧部材は、電極である、
付記１～付記５のいずれか一つに記載の接合継手の製造方法。
(付記７）
付記１～付記６のいずれか一つに記載の接合継手の製造方法によって製造された前記接合継手における前記接合部としての第一接合部に、前記板材としての第一板材とは別の第二板材に形成された第二接合部を重ね合わせ、
前記第二接合部に形成された挿通穴にボルトのネジ部を挿通すると共に、前記ネジ部を前記ナットの前記ネジ穴に螺入して、前記第一接合部及び前記第二接合部を接合する、
ことを含む板材接合方法。
(付記８）
板材に形成された接合部と、前記接合部に接合されたナットとを備える接合継手において、
前記ナットは、ネジ穴を有する雌ネジ部と、前記ネジ穴と同軸に形成された貫通穴を有し、前記雌ネジ部の軸方向一方側の端部から突出する軸部とを備え、前記雌ネジ部の外径は、前記軸部の外径より大きく、前記雌ネジ部の肉厚は、前記軸部の肉厚より厚く、
前記軸部は、前記接合部に形成された通し穴に挿通され、
前記雌ネジ部は、前記接合部の第一板面に当接し、
前記軸部の先端部は、前記接合部の第二板面から突出し、
前記軸部の先端部には、前記第二板面における前記通し穴の周囲部に係止されたかしめ部が形成されている、
接合継手。
(付記９）
前記通し穴は、ネジ穴であり、
前記軸部は、雄ネジであり、前記通し穴に螺入されている、
付記８に記載の接合継手。
(付記１０）
前記通し穴は、多角穴であり、
前記軸部は、多角筒であり、前記通し穴に係合されている、
付記８に記載の接合継手。
(付記１１）
前記接合部は、前記板材に形成された平坦部に対して前記第一板面の側に膨出し、頂部に前記通し穴が形成された膨出部を有する、
付記８～付記１０のいずれか一つに記載の接合継手。
(付記１２）
前記膨出部の頂部に対する前記軸部の先端部の突出高さが、前記膨出部の頂部と前記平坦部との間で前記第二板面に形成された段差の高さよりも低い、
付記１０に記載の接合継手。
(付記１３）
前記ナットは、金属製であり、
前記板材は、引張強さが７８０ＭＰａ以上の鋼板である、
付記８～付記１２のいずれか一つに記載の接合継手。
(付記１４）
付記８～付記１３のいずれか一つに記載の接合継手を備える自動車部品。
(付記１５）
付記８～付記１３のいずれか一つに記載の接合継手と、
前記板材としての第一板材とは別の第二板材に形成され、前記接合部としての第一接合部に重ね合わされた第二接合部と、
前記第二接合部に形成された挿通穴にネジ部が挿通されると共に、前記ネジ部が前記ナットの前記ネジ穴に螺入され、前記第一接合部及び前記第二接合部を接合するボルトと、
を備える板材接合構造。
(付記１６）
付記１５に記載の板材接合構造を備える自動車部品。
(付記１７）
ネジ穴を有する雌ネジ部と、
前記ネジ穴と同軸に形成された貫通穴を有し、前記雌ネジ部の軸方向一方側の端部から突出する軸部と、
を備え、
前記雌ネジ部の外径は、前記軸部の外径より大きく、前記雌ネジ部の肉厚は、前記軸部の肉厚より厚い、
ナット。
(付記１８）
前記軸部は、雄ネジである、
付記１７に記載のナット。
(付記１９）
前記軸部は、多角筒である、
付記１７に記載のナット。(Appendix 1)
In a method for manufacturing a bonded joint, wherein a nut is fixed to a joint formed in a plate material to obtain a bonded joint including the joint and the nut,
The nut includes a female screw portion having a screw hole, and a shaft portion having a through hole formed coaxially with the screw hole and protruding from one axial end of the female screw portion, an outer diameter of the female thread portion is larger than an outer diameter of the shaft portion, and a wall thickness of the female thread portion is thicker than the wall thickness of the shaft portion;
As a step of fixing the nut to the joint,
The shaft portion is inserted through a through hole formed in the joint portion so that the female screw portion is brought into contact with the first plate surface of the joint portion, and the distal end portion of the shaft portion is inserted into the second plate surface of the joint portion. A first step of protruding from the plate surface;
In a state in which the nut is sandwiched between a pair of heating and pressurizing members from both sides in the axial direction of the nut, the nut is heated and pressurized by the pair of heating and pressurizing members, thereby crimping the tip portion of the shaft portion, a second step of forming a crimped portion that engages with a peripheral portion of the through hole on the second plate surface at the tip portion of the shaft portion;
A method of manufacturing a joint joint comprising:
(Appendix 2)
the through hole is a screw hole,
The shaft portion is a male screw,
In the first step, screwing the shaft portion into the through hole,
A method for manufacturing a bonded joint according to appendix 1.
(Appendix 3)
the through hole is a polygonal hole,
The shaft portion is a polygonal cylinder,
In the first step, engaging the shaft with the through hole;
A method for manufacturing a bonded joint according to appendix 1.
(Appendix 4)
The joint portion has a bulging portion that bulges toward the first plate surface with respect to a flat portion formed on the plate material and that has the through hole formed at the top thereof.
A method for manufacturing a joint joint according to any one of appendices 1 to 3.
(Appendix 5)
In the second step, by heating and pressurizing the nut with the pair of heating and pressurizing members, the projection height of the tip portion of the shaft portion with respect to the top portion of the bulging portion is adjusted to the top portion of the bulging portion. crimping the tip portion of the shaft portion so that the height between the flat portion and the flat portion is lower than the height of the step formed on the second plate surface;
A method for manufacturing a bonded joint according to appendix 4.
(Appendix 6)
The nut is made of metal,
The plate material is a steel plate having a tensile strength of 780 MPa or more,
The heating and pressurizing member is an electrode,
A method for manufacturing a joint joint according to any one of appendices 1 to 5.
(Appendix 7)
A second plate material different from the first plate material as the plate material is added to the first joint portion as the joint portion in the joined joint manufactured by the method for manufacturing a joint joint according to any one of Appendixes 1 to 6. Overlapping the second joint formed on the plate material,
A threaded portion of a bolt is inserted through an insertion hole formed in the second joint portion, and the threaded portion is screwed into the threaded hole of the nut to join the first joint portion and the second joint portion. do,
A plate joining method comprising:
(Appendix 8)
A joint joint comprising a joint formed in a plate material and a nut joined to the joint,
The nut includes a female screw portion having a screw hole, and a shaft portion having a through hole formed coaxially with the screw hole and protruding from one axial end of the female screw portion, an outer diameter of the female thread portion is larger than an outer diameter of the shaft portion, and a wall thickness of the female thread portion is thicker than the wall thickness of the shaft portion;
The shaft portion is inserted through a through hole formed in the joint portion,
The female screw portion abuts on the first plate surface of the joint portion,
a tip portion of the shaft portion protrudes from a second plate surface of the joint portion;
A crimped portion is formed at a tip portion of the shaft portion and is engaged with a peripheral portion of the through hole on the second plate surface,
joint joint.
(Appendix 9)
the through hole is a screw hole,
The shaft portion is a male screw and is screwed into the through hole,
The joint joint according to appendix 8.
(Appendix 10)
the through hole is a polygonal hole,
The shaft portion is a polygonal tube and is engaged with the through hole,
The joint joint according to appendix 8.
(Appendix 11)
The joint portion has a bulging portion that bulges toward the first plate surface with respect to a flat portion formed on the plate material and that has the through hole formed at the top thereof.
The joining joint according to any one of appendices 8 to 10.
(Appendix 12)
The projection height of the tip of the shaft with respect to the top of the bulging portion is lower than the height of the step formed on the second plate surface between the top of the bulging portion and the flat portion,
11. The joint joint according to Appendix 10.
(Appendix 13)
The nut is made of metal,
The plate material is a steel plate having a tensile strength of 780 MPa or more,
The joining joint according to any one of appendices 8 to 12.
(Appendix 14)
An automobile part comprising the joint according to any one of appendices 8 to 13.
(Appendix 15)
The joining joint according to any one of appendices 8 to 13;
a second joint portion formed on a second plate material different from the first plate material as the plate material and superimposed on the first joint portion as the joint portion;
A bolt that joins the first joint portion and the second joint portion by inserting a screw portion into an insertion hole formed in the second joint portion and screwing the screw portion into the screw hole of the nut. and,
A plate material joining structure.
(Appendix 16)
An automobile part comprising the plate material joining structure according to appendix 15.
(Appendix 17)
a female threaded portion having a screw hole;
a shaft portion having a through hole formed coaxially with the screw hole and protruding from one axial end of the female thread portion;
with
The outer diameter of the female threaded portion is greater than the outer diameter of the shaft portion, and the thickness of the female threaded portion is greater than the thickness of the shaft portion.
nut.
(Appendix 18)
The shaft portion is a male screw,
A nut according to Appendix 17.
(Appendix 19)
The shaft portion is a polygonal tube,
A nut according to Appendix 17.
Claims (11)
前記締結部材には、前記軸部の軸方向に沿って前記軸部及び前記フランジを貫通する第１の貫通穴があり、
前記フランジにおける前記第１の貫通穴は、ネジ穴であって、
前記軸部の横断面における前記第１の貫通穴の径は、前記フランジの横断面における前記ネジ穴の谷径より大きい、
前記締結部材を、第２の貫通穴のある第１の板材に固定する継手の製造方法であって、
前記第１の板材の前記第２の貫通穴に、前記締結部材の前記軸部を通すこと、
前記第１の板材に前記フランジを当接させること、
前記軸部の先端を潰して前記軸部を径方向外側に拡げて前記第１の板材をかしめるとともに、前記軸部の軸方向に沿って見て前記軸部における前記第１の貫通穴の縁よりも前記軸部を径方向内側に延出させること、
を備える継手の製造方法。 A fastening member comprising a shaft and a flange provided at an axial end of the shaft,
The fastening member has a first through hole penetrating the shaft portion and the flange along the axial direction of the shaft portion,
The first through hole in the flange is a screw hole,
The diameter of the first through hole in the cross section of the shaft portion is larger than the root diameter of the screw hole in the cross section of the flange,
A method for manufacturing a joint for fixing the fastening member to a first plate having a second through hole ,
passing the shaft portion of the fastening member through the second through hole of the first plate;
abutting the flange against the first plate;
The tip of the shaft portion is crushed to widen the shaft portion radially outward to caulk the first plate material, and the first through hole in the shaft portion is formed when viewed along the axial direction of the shaft portion. extending the shaft portion radially inward from the edge;
A method of manufacturing a joint comprising:
前記フランジの肉厚は、前記軸部の肉厚より厚い、
請求項１に記載の継手の製造方法。 The outer diameter of the flange is larger than the outer diameter of the shaft,
the thickness of the flange is greater than the thickness of the shaft;
A method for manufacturing a joint according to claim 1.
請求項１又は請求項２に記載の継手の製造方法。 The shaft portion is a male screw,
A method for manufacturing a joint according to claim 1 or 2.
前記締結部材には、前記軸部の軸方向に沿って前記軸部及び前記フランジを貫通する第１の貫通穴があり、The fastening member has a first through hole penetrating the shaft portion and the flange along the axial direction of the shaft portion,
前記フランジにおける前記第１の貫通穴は、ネジ穴であって、The first through hole in the flange is a screw hole,
前記軸部の横断面における前記第１の貫通穴の径は、前記フランジの横断面における前記ネジ穴の谷径より大きい、The diameter of the first through hole in the cross section of the shaft portion is larger than the root diameter of the screw hole in the cross section of the flange,
前記締結部材を、第２の貫通穴のある第１の板材に固定する継手の製造方法であって、A method for manufacturing a joint for fixing the fastening member to a first plate having a second through hole,
前記第１の板材の前記第２の貫通穴に、前記締結部材の前記軸部を通すこと、passing the shaft portion of the fastening member through the second through hole of the first plate;
前記第１の板材に前記フランジを当接させること、abutting the flange against the first plate;
前記軸部の先端を潰して前記第１の板材をかしめること、crimping the first plate by crushing the tip of the shaft;
を備え、with
前記第２の貫通穴は、ネジ穴であって、The second through hole is a screw hole,
前記軸部は、雄ネジであって、The shaft portion is a male screw,
前記軸部を前記第２の貫通穴にねじ込む、screwing the shaft into the second through hole;
継手の製造方法。Method for manufacturing fittings.
前記軸部を前記第２の貫通穴に係合する、engaging the shaft with the second through hole;
請求項１～請求項３の何れか１項に記載の継手の製造方法。A method for manufacturing a joint according to any one of claims 1 to 3.
請求項１～請求項５の何れか１項に記載の継手の製造方法。A method for manufacturing a joint according to any one of claims 1 to 5.
前記第１の板材は、引張強さが７８０ＭＰａ以上の鋼板であって、The first plate material is a steel plate having a tensile strength of 780 MPa or more,
前記一対の加熱加圧部材は、一対の電極である、The pair of heating and pressurizing members are a pair of electrodes,
請求項６に記載の継手の製造方法。A method for manufacturing a joint according to claim 6.
前記雄ネジ部を前記軸部の前記第１の貫通穴に通すこと、passing the male threaded portion through the first through hole of the shaft;
前記雄ネジ部を前記ネジ穴にねじ込んで前記第２の板材を固定すること、fixing the second plate member by screwing the male screw portion into the screw hole;
を備える請求項１～請求項７の何れか１項に記載の継手の製造方法。A method for manufacturing a joint according to any one of claims 1 to 7.
請求項８に記載の継手の製造方法。A method for manufacturing a joint according to claim 8.
軸部と、前記軸部の軸方向端部に設けられたフランジと、を備え、前記軸部が前記第２の貫通穴に通された状態で、前記フランジが前記板材に当接された締結部材と、A fastening system comprising a shaft portion and a flange provided at an axial end portion of the shaft portion, wherein the flange is in contact with the plate member while the shaft portion is passed through the second through hole. a member;
を備え、with
前記締結部材には、前記軸部の軸方向に沿って前記軸部及び前記フランジを貫通する第１の貫通穴があり、The fastening member has a first through hole penetrating the shaft portion and the flange along the axial direction of the shaft portion,
前記フランジにおける前記第１の貫通穴は、ネジ穴であって、The first through hole in the flange is a screw hole,
前記軸部の横断面における前記第１の貫通穴の径は、前記フランジの横断面における前記ネジ穴の谷径より大きく、The diameter of the first through hole in the cross section of the shaft portion is larger than the root diameter of the screw hole in the cross section of the flange,
前記第２の貫通穴から突出する前記軸部の先端部には、前記軸部の径方向外側へ拡がり前記フランジとで前記板材をかしめるかしめ部、及び前記軸部の軸方向に沿って見て前記軸部における前記第１の貫通穴の縁よりも前記軸部の径方向内側へ延出する延出部が形成されている、At the tip of the shaft protruding from the second through hole, there is a crimping portion that expands radially outward of the shaft and crimps the plate material together with the flange, an extending portion extending radially inward of the shaft portion from the edge of the first through hole in the shaft portion;
継手。fittings.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020115833 | 2020-07-03 | ||
| JP2020115833 | 2020-07-03 | ||
| PCT/JP2021/025215 WO2022004890A1 (en) | 2020-07-03 | 2021-07-02 | Fastening member, method for manufacturing joint, joint, and automotive component |
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| JPWO2022004890A1 JPWO2022004890A1 (en) | 2022-01-06 |
| JP7332966B2 true JP7332966B2 (en) | 2023-08-24 |
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|---|---|---|---|---|
| JP2016056940A (en) | 2014-09-08 | 2016-04-21 | 廣志 赤羽 | Fastening tool, hammer rod and fastening tool fixing method |
| JP2019056402A (en) | 2017-09-20 | 2019-04-11 | プレス工業株式会社 | Caulking nut, caulking tool for caulking nut and caulking nut attaching method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1759339A (en) * | 1927-07-15 | 1930-05-20 | Smith Corp A O | Threaded nut for securing metal parts |
| US2415695A (en) * | 1944-10-20 | 1947-02-11 | Cann Edward | Attaching nuts to plates |
| JPS63224822A (en) * | 1987-03-12 | 1988-09-19 | Yamakawa Kogyo Kk | Method for fixing headed shaft to plate stock |
| JPH06185515A (en) * | 1992-12-18 | 1994-07-05 | Sannohashi:Kk | Method for fixing bolt to plate material and structure of this bolt |
| JP4093674B2 (en) * | 1999-03-31 | 2008-06-04 | 三洋電機株式会社 | Caulking nut mounting structure and air conditioner |
| JP2001065525A (en) * | 1999-08-23 | 2001-03-16 | Ito Seisakusho:Kk | Detachable caulking element |
| DE102008052383A1 (en) * | 2008-10-20 | 2010-04-22 | Profil Verbindungstechnik Gmbh & Co. Kg | Assembly part consisting of a fastener and a sheet metal part and a method for producing such a component assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2016056940A (en) | 2014-09-08 | 2016-04-21 | 廣志 赤羽 | Fastening tool, hammer rod and fastening tool fixing method |
| JP2019056402A (en) | 2017-09-20 | 2019-04-11 | プレス工業株式会社 | Caulking nut, caulking tool for caulking nut and caulking nut attaching method |
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| JPWO2022004890A1 (en) | 2022-01-06 |
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