JP2002284045A - Vehicle member connection method and vehicle member connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle member connection method and a vehicle member connection structure capable of preventing deflection caused on a panel surface in connection between vehicle members formed of different kinds of metals. SOLUTION: In connection between a first member (made of steel) and a second member 2 (made of aluminum) formed of different kinds of metals, an adhesion inhibiting agent 32 is applied to a connection face of the second member 2, while an adhesive sealing agent 31 is applied to a connection face of the first member 1, and the first member and the second member are mechanically connected together by means of a rivet 4 and the like while an insulative sealing layer 3 is arranged between them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining method for a vehicle member and a joining structure for a vehicle member for preventing distortion generated on a panel surface in joining a vehicle member made of dissimilar metal.

[0002]

2. Description of the Related Art In order to reduce the weight of a vehicle body, a vehicle member (for example, an aluminum roof panel) formed of aluminum or an aluminum alloy is used. When joining a vehicle member made of aluminum, which is a dissimilar metal, to a vehicle member made of steel, metallurgical joining (melt joining such as spot welding) is performed because their physical properties such as melting point and linear expansion coefficient are different. Is not employed, but mechanical joining using fasteners such as rivets and bolts or caulking is employed.
In the case where dissimilar metals are joined to each other in this way, electrolytic corrosion is caused by an electrolyte such as rainwater that has penetrated into minute gaps at the contact points between the two metals. This electrolytic corrosion causes not only the appearance of the vehicle body to be rusted, which impairs the appearance, but also causes rainwater to enter the vehicle interior. For this reason, a method has been used in which an electrically insulating sealing agent is interposed so that the dissimilar metals do not come into direct contact in an electrolytic corrosion environment, and the two are joined.

[0003] Examples of the electrically insulating sealant include a PVC-based sealant applied in a painting process and an epoxy-based sealant applied in a vehicle body process. Among them, the PVC-based sealing member has relatively poor weather resistance, and particularly, the plastic component in the composition is lost due to the presence of water, and the sealing function tends to gradually decrease. Therefore, from the viewpoint of the possibility of electrolytic corrosion, there is a problem in applying a PVC-based seal to an environmentally severe site. On the other hand, the epoxy sealant is excellent in weather resistance and has no problem from the viewpoint of preventing the occurrence of electrolytic corrosion. Further, the epoxy-based material has an extremely high strength so as to be used for bonding, and exhibits the strength by a thermosetting reaction. It is known that the epoxy-based material undergoes curing shrinkage during the thermosetting reaction.

[0004]

However, as shown in FIG. 3, when the panel rigidity is low, such as when an aluminum roof is joined to a steel body, a vehicle member made of two different metals is used. Panel (vehicle member) due to the difference in thermal expansion coefficient between them and the curing shrinkage of the epoxy sealant
There is a problem that local distortion occurs on the outer surface.
Further, it is conceivable to mechanically join the insulating film or tape between two vehicle members without going through the heat curing step, but the joining portion changes two-dimensionally and three-dimensionally. In such a case, there is a problem that the film or tape cannot follow the shape of the joint surface. Further, there is a problem that the operation of attaching a film or a tape to the joint portion is complicated even if the joint portion has a primary shape, and the work efficiency is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has been made in consideration of the above-described problems. An object of the present invention is to provide a joint structure for a vehicle member.

[0006]

(1) In order to achieve the above object, according to the first aspect of the present invention, in a method of joining vehicle members made of dissimilar metals, one member and the other member are joined together. A bonding method for a vehicle member, in which a bonding surface of the vehicle is bonded to one of the bonding surfaces and a weakly or non-bonded electric insulating sealant is applied to the other bonding surface to mechanically bond the two members. You. According to the invention as set forth in claim 8, in the joint structure for a vehicle member made of the dissimilar metal, an electric insulating seal layer interposed on a joint surface between one member and the other member; A joining means for mechanically joining, wherein the electrically insulating sealing layer is adhered to the one joining surface and is weakly or non-adhered to the other joining surface. Is done. According to the present invention, between the members to be joined, an electrically insulative sealing agent that is adhered to the joining surface of one member and weakly adhered or not adhered is applied to the other joining surface.

As a result, since the electrically insulating sealant is bonded to only one member, a method for joining a vehicle member and a structure for joining a vehicle member do not cause panel distortion due to curing shrinkage of the electrically insulating sealant. Can be provided. Further, since the electrically insulating sealant applied to the vehicle member is liquid at the time of application, the vehicle member can be joined following the shape even on a complicated two-dimensional or three-dimensional joint surface. it can. Therefore, it is possible to provide a joining method of a vehicle member having high working efficiency and a joining structure of a vehicle member having high appearance quality.

[0008] The present invention and claims 2 to 5 and 8
In the inventions of the first to twelfth aspects, the vehicle member made of a dissimilar metal is a member using a material composed of a different metal element, and is, for example, a vehicle member made of a steel member and an aluminum member. .

(2) In order to achieve the above object, according to the second aspect of the present invention, in a method for joining vehicle members made of different metals, an adhesion inhibitor is applied to the joint surface of the other member. According to the third aspect of the present invention, there is provided a vehicle member joining method in which an electrically insulating sealant is applied to a joining surface of one of the members to mechanically join the two members.
3. The method according to claim 2, wherein the adhesion inhibitor includes at least one of a release agent and a lubricant. According to the eighth aspect of the present invention, according to the ninth aspect of the present invention, there is provided a joining structure for a vehicle member, wherein the electrical insulating sealing layer includes an adhesion inhibitor layer on the other joining surface side. According to the tenth aspect of the present invention, there is provided a bonding structure of a vehicle member, wherein the adhesion inhibitor layer includes at least one of a release agent and a lubricant. According to the present invention, an electrically insulating sealant is applied to the joining surface of one member, and a release agent, a lubricant, or another adhesion inhibitor is applied to the joining surface of the other member. This adhesion inhibitor prevents the electrically insulating sealant from adhering to the joining surface of the other member. Thus, the present invention has the same effects as the first and eighth aspects.

(3) In order to achieve the above object, according to the invention of claim 4, in the method of joining vehicle members made of dissimilar metals, electric insulation containing a surfactant on the joining surface of one member is provided. A method for joining a vehicle member, comprising applying a conductive sealant and mechanically joining the two members, is provided. According to the invention according to claim 5, the content of the surfactant is controlled by the electric insulating sealant. 0.1% based on 100 parts by weight of solids
The present invention provides a method for joining vehicle members of up to 5%. According to the invention of claim 8, according to the invention of claim 11, the electrically insulating sealing layer provides a joining structure of a vehicle member containing a surfactant. According to this, the content of the surfactant is 0.1% with respect to 100 parts by weight of the solid content of the electrically insulating sealing layer.
The present invention provides a vehicle member joining structure of up to 5%.

According to the present invention, an electrically insulating sealant containing a surfactant is applied between the vehicle members to be joined.
It is preferable that the surfactant is previously blended with the electrically insulating sealant. The surfactant added to the electrically insulating sealant is applied to one member, so that it collects on the side that is not in contact with one member (the side that is in contact with air, the joint surface side of the other member). Therefore, the adhesiveness between the other member and the electrically insulating sealant is reduced. For this reason, the strength of the joint between the two members can be adjusted only by performing the step of applying an electrically insulating seal (including a surfactant) to the joint surface of the steel member. That is, of the electrically insulating seal, the steel member side is strongly bonded, and the aluminum member side is weakly bonded or non-bonded.

As a result, it is possible to provide a bonding method of a vehicle member and a bonding structure of the vehicle member, in which the adhesive force of the electrically insulating sealant to the vehicle member is weakened and distortion due to curing shrinkage does not occur. Further, since the electrically insulating sealant applied to the vehicle member is liquid at the time of application,
A vehicle member can be joined by following the shape of a complicated three-dimensional joint surface. For this reason,
It is possible to provide a joining method of a vehicle member having high working efficiency and a joining structure of a vehicle member having high appearance quality.

In the fifth and twelfth aspects of the present invention, when the content of the surfactant is less than 0.1%, the adhesive force of the electrically insulating sealant is strong, and the panel surface is distorted due to curing shrinkage. Would. On the other hand, if it exceeds 5%, the adhesion to the vehicle member is weak, and the electrically insulating sealant is peeled off from the vehicle member in the working process, making it impossible to prevent electrolytic corrosion. For these reasons, the content of the surfactant is set to 0.1% to 5%.

(4) In order to achieve the above object, according to the first to fifth aspects of the present invention, according to the sixth aspect, the one member to which the electrically insulating sealant is applied is made of steel. A method for joining a vehicle member, wherein the other member is an aluminum member. Also,
According to the invention of claims 8 to 12, according to the invention of claim 13, the one joining surface to which the electrically insulating sealing layer adheres is a joining surface of a steel member, and the other joining surface is A joint structure for a vehicle member, which is a joint surface of an aluminum member, is provided.

According to the present invention, in the above inventions 1 to 5, when the vehicle member made of a dissimilar metal is made of a steel member and an aluminum member, the electrically insulating sealant is bonded to the steel member. . For this reason, the electrically insulating sealant becomes weakly adhered or non-adhered to the aluminum member (corresponding to claim 1), and a release agent or a lubricant or other adhesion inhibitor is applied to the aluminum member (claims 2 and 3). Corresponding), the surfactant contained in the electrically insulating sealant gathers on the bonding surface side of the aluminum member, and the surfactant comes into contact with the aluminum member (claims 4 and 5). When the vehicle member is made of a dissimilar metal, for example, a steel member and an aluminum member, it is desirable that the steel member be sufficiently electrodeposited because electric corrosion is likely to occur at the joint surface.

The operation of the invention according to claim 6 will be described. As a comparison, a case where an electrically insulating seal is applied to an aluminum member will be described. It is assumed that a gap is formed between the electrically insulating seal and the bonding surface of the weakly or non-bonded steel member for some reason while the joint member is being subjected to the electrodeposition coating and being used. In this case, the joining surface of the steel member at the portion where the electric insulating seal has been peeled off is exposed because the electrodeposition coating is not applied. For this reason, structural rust and electric corrosion with aluminum occur in the steel member, and there is a problem in rust prevention.

On the other hand, in the present invention, an electrically insulating seal is applied to the joining surface of the steel member, joined to an aluminum member, and subjected to electrodeposition coating. It is assumed that a gap is generated between the electrically insulating seal and the bonding surface of the weakly or non-adhered aluminum member for some reason. In this case, even if the electrically insulating seal is peeled off from the aluminum member, the aluminum member is only exposed and does not cause structural rust. Further, since the steel member coated with the electric insulating sealant has at least one of the electric insulating seal and the electrodeposition coating, the steel member is not exposed. Therefore, it is possible to provide a joining method for a vehicle member and a joining structure for a vehicle, in which rust prevention of the steel member is ensured.

[0018] Claim 6 or Claim 4 or Claim 4
In the described invention, the electrically insulating seal containing the surfactant is applied to a steel member. In this case, the surfactant contained in the electrically insulating seal collects on the side that is not in contact with the applied steel member (the side that is in contact with air, the joining surface side of the aluminum member) due to its characteristics. For this reason, the strength of the joint between the two members can be adjusted only by performing the step of applying an electrically insulating seal (including a surfactant) to the joint surface of the steel member. That is, of the electrically insulating seal, the steel member side is strongly bonded, and the aluminum member side is weakly bonded or non-bonded.

(5) In order to achieve the above object, according to the invention as set forth in claim 7, the two members are mechanically joined to each other before the electric insulating sealant is solidified. A method is provided. In the present invention, before the electric insulating sealant is solidified, the vehicle member is mechanically joined with the electric insulating sealant interposed therebetween. Thereby, while having the same effect as the above invention, the electrically insulating sealant on the liquid applied along the joining surface receives the force in the mechanical joining, adapts to the joining surface of both members, and Thus, there can be provided a method for joining vehicle members, which eliminates gaps and can improve the effect of preventing electrolytic corrosion.

[0020]

According to the present invention, since the electrically insulating sealant is bonded to only one member, a method of joining a vehicle member and a vehicle in which distortion of a panel does not occur due to curing shrinkage of the electrically insulating sealant. The joining structure of the member for use can be provided. Further, since the electrically insulating sealant applied to the vehicle member is liquid at the time of application, the vehicle member can be joined following the shape even on a complicated two-dimensional or three-dimensional joint surface. it can. Therefore, it is possible to provide a joining method of a vehicle member having high working efficiency and a joining structure of a vehicle member having high appearance quality.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a joining structure of a vehicle member, and FIG. 2 is a diagram illustrating mechanical joining of a vehicle member.

First, a method of joining a vehicle member according to the present embodiment will be described with reference to FIG.

<First joining method and joining structure> FIG. 1A shows a first joining method and joining structure. The second member for vehicles
A liquid release agent, a solid lubricant and other adhesion inhibitors 32 are applied to the periphery of the member 2 (aluminum member) in advance along the joint surface. First member 1 (steel member)
Around the joint surface along the joint surface.
1 is applied. Also, the second member 2 is formed (pressed).
It is also possible to use a solid lubricant at this time. FIG. 1A shows a state in which the adhesion inhibitor 32 and the electrically insulating sealing agent 31 are applied between the first member 1 and the second member 2. The insulating sealing layer 3 is generally formed in a vehicle body process.

As the release agent 32, either a solid type or a liquid type release agent 32 can be used.
As a typical release agent, a silicone-based or fluorine-based release agent can be used. As the solid lubricant 32, for example, a wax-like lubricant containing paraffin as a main component and solidified at a low temperature described in JP-A-5-247479, and JP-A-6-9980 are described. A solid lubricant that is applied to the surface of the member, dried, and solidified can be used.

As the electrically insulating sealant 31, an adhesive material (epoxy adhesive) used for a hemming portion of a door panel in a vehicle body process may be used. Specifically, an acrylic resin composition can be used in addition to an epoxy resin composition such as Sandine (made by Asahi Rubber Co., Ltd.) and penguin cement (made by Sunstar Giken Co., Ltd.).

The vehicle members 1 and 2 include a first member 1 and a second member 2 to be joined. In the present embodiment, the first member is a steel member, and the second member is an aluminum member.
The combination of the materials of the first member 1 and the second member 2 of the vehicle member is not limited to the above, but in the relationship between the first member 1 and the second member, the metal constituting the first member 1 Is preferably a metal having a lower ionization tendency than the metal constituting the second member 2.

The first member 1 and the second member 2 are joined by mechanical joining. For the mechanical joining, a joining method such as a self-piercing rivet, a blind rivet, a mechanical clinch, and a caulking is used. In the present invention, any known means can be applied to the mechanical joining.

Here, the mechanical joining will be described.
The joining of the vehicle members according to the present embodiment can be performed by using a general mechanical joining, and the following joining method is merely an example for facilitating understanding of the present invention, and the present invention is limited. It does not do.

FIG. 2 shows an example of mechanical joining using the rivet 4 as a mechanical joining member. FIG. 2 shows the first member 1
(Steel member) and the joining of the second member 2 (aluminum member) are shown. The first member 1 and the second member 2 are joined by rivets 4. An insertion hole into which the rivet 4 can be inserted is formed at a predetermined position on the joint surface 1 ′ of the first member 1. After positioning the joining position between the second member 2 and the first member 1, the rivet 4 is fitted into the fitting hole from the first member side. The die 5 and the plunger 6 are arranged at positions facing each other with the rivet 4 fitted at the center, and the die 5 and the plunger 6 can move up and down relatively. When the die 5 and the plunger 6 are tightened, the rivet 4 and the second member 2 are deformed, and the first member 1 and the second member 2 are joined. At this time, the second member 2 is connected to the cavity 5 of the die 5.
1 is deformed. According to this mechanical joining,
The rivet 4 is not exposed outside the vehicle body.
The insulating seal layer 3 according to the present invention comprises the first member 1 and the second member 1.
It is formed between the member 2.

<Second joining method and joining structure> FIG. 1B shows the second joining method and joining structure. The second bonding method differs from the first bonding method only in the composition of the insulating seal layer 3 formed between the first member 1 and the second member. In the second bonding method, the insulating seal layer 3 is formed from an electric insulating sealant 31 containing a surfactant 33.
It is preferable that the surfactant 33 is previously blended with the electrically insulating sealant 31. Electrical insulating sealant 31
The surfactant 33 added to the first member 1 is applied to the first member 1 and collects on the side not in contact with the first member 1 (the side that is in contact with air, the bonding surface side of the second member 2). The adhesiveness between the second member 2 and the electrically insulating sealant 31 is reduced.

As the surfactant 33, a fluorine-based or silicone-based surfactant 33 can be used. For example, Megafac (manufactured by Dainippon Ink and Chemicals), Surflon (manufactured by Asahi Glass Co., Ltd.), and Unidyne (manufactured by Daikin Industries, Ltd.) can be used by being previously blended with an electrically insulating sealant.

The amount of the surfactant 33 added is 0.1% to 5% based on 100 parts by weight of the solid content of the electrically insulating sealant 31.
%. Thus, the surfactant 33
The content of 0.1% to 5% is that if it is less than 0.1%, the adhesive force of the electrically insulating sealant 31 is strong, and distortion of the panel surface due to curing shrinkage occurs. If it exceeds 5%, the adhesive strength to the vehicle members 1 and 2 is weak, and the electrically insulating sealant 33 is peeled off from the vehicle member in the work process, and it becomes impossible to prevent electrolytic corrosion. is there.

The vehicle members 1 and 2 of this kind can be used as hoods, front doors, rear doors, back doors, trunk doors and other vehicle members constituting a vehicle body, and in particular, a loop under an electrolytic corrosion environment. Suitable for opening and closing parts such as panels and doors.

The embodiments described above are described to facilitate understanding of the present invention, but are not described to limit the present invention. Therefore, each element and each numerical value disclosed in the above embodiment are:
It is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

[Brief description of the drawings]

FIG. 1 is a view showing a joining structure of a vehicle member.

FIG. 2 is a diagram illustrating mechanical joining of vehicle members.

FIG. 3 is a diagram illustrating a conventional problem.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... 1st member, steel member 2 ... 2nd member, aluminum member 3 ... Insulating seal layer 31 ... Adhesive sealant, epoxy sealant 32 ... Adhesion inhibitor, release agent, solid Lubricant 33 ... Surfactant 4 ... Joining means, mechanical joining member, rivet 5 ... Dice 6 ... Plunger 7 ... Front glass 8 ... Rear glass 10 ... Joint

Continued on the front page F-term (reference) 4D075 CA07 CA09 CA13 CA23 CA33 CA47 DA23 DB02 DB07 DC12 EA07 EA35 EA39 EB22 EB33 EC35 EC54 EC60 4F100 AB01A AB01D AB03A AB10D AH05C AH06C AK53C AR00B AR00C BA04 BA07 CA10BBABCAB JB10B10 JL00 JL14C YY00B

Claims (13)

[Claims] 1. A method of joining a vehicle member made of a dissimilar metal, the method comprising: bonding one member to the other member, bonding the one member to the other member, and weakly bonding or non-bonding the other member to the other member. A method for joining vehicle members by applying an insulating sealant and mechanically joining both members. 2. A method for joining a vehicle member made of a dissimilar metal, wherein an adhesion inhibitor is applied to a joint surface of the other member.
A method for joining vehicle members in which an electrically insulating sealant is applied to a joining surface of one member and the two members are joined mechanically. 3. The method according to claim 2, wherein the adhesion inhibitor contains at least one of a release agent and a lubricant. 4. A method of joining a vehicle member made of a dissimilar metal, wherein an electrically insulating sealing agent containing a surfactant is applied to a joint surface of one member, and the two members are mechanically joined. Joining method. 5. The content of the surfactant is 0.1% to 5% by weight based on 100 parts by weight of the solid content of the electrically insulating sealant.
5. The method for joining vehicle members according to claim 4. 6. The method according to claim 1, wherein the one member to which the electrically insulating sealing agent is applied is a steel member, and the other member is an aluminum member. 7. The method according to claim 1, wherein the two members are mechanically joined before the electric insulating sealant is solidified. 8. A joining structure for a vehicle member made of a dissimilar metal, wherein: an electrically insulating seal layer interposed between joining surfaces of one member and the other member; and joining means for mechanically joining the two members. A bonding structure for a vehicle member, wherein the electrically insulating sealing layer is bonded to the one bonding surface and is weakly or non-bonded to the other bonding surface. 9. The joining structure for a vehicle member according to claim 8, wherein the electrically insulating sealing layer includes an adhesion inhibitor layer on the other joining surface side. 10. The structure according to claim 9, wherein the adhesion inhibitor layer contains at least one of a release agent and a lubricant. 11. The joining structure for a vehicle member according to claim 8, wherein said electrically insulating sealing layer contains a surfactant. 12. The content of the surfactant is 0.1% to 100% by weight of the solid content of the electrically insulating sealing layer.
The joint structure for a vehicle member according to claim 11, which is 5%. 13. The bonding surface of one of the members to which the electrically insulating sealing layer is bonded is a bonding surface of a steel member, and the other bonding surface is a bonding surface of an aluminum member.
3. The joining structure of the vehicle member according to 2.