JP2008273053A - Adhesion method and adhesion structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesion method capable of suppressing peeling of an adhesion surface while suppressing formation of voids, and to provide an adhesion structure. <P>SOLUTION: In the adhesion method and the adhesion structure, respective adhesion surfaces 11, 12 of a pair of adhesion members are attached to each other by an adhesive agent. A ridge-like projection part 14 where a main adhesive agent 6 is linearly applied to one side of the adhesion surfaces 11, 12, and which is provided on the other side of the adhesion surfaces 11, 12, and projected from the adhesion surface are adhered by curing the main adhesive agent 6 after two adhesion surfaces 11, 12 are made to approach to contact from the tip end part 15 projecting to the most of the projection part 14 to the main adhesive agent 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bonding method and a bonding structure for bonding a pair of members with an adhesive.

In recent years, for example, in structural members for vehicles, resins have been used for weight reduction, and in particular, FRP (fiber reinforced plastic) reinforced with fiber material is used. When manufacturing a structural member by FRP, the members may be joined with an adhesive, but in that case, it is necessary to apply the adhesive to a large area, in order to apply the adhesive to the entire surface, After depositing the adhesive in a line shape, it is crushed and spread (for example, see Patent Document 1). However, in this method, the adhesive bites air and easily generates voids, which causes peeling of the adhesive surface.
JP 2005-350547 A

  The present invention has been made to solve the problems associated with the above-described prior art, and an object thereof is to provide an adhesion method and an adhesion structure that can suppress the occurrence of voids and suppress the peeling of the adhesion surface.

  An adhesion method according to the present invention that achieves the above object is an adhesion method in which the adhesive surfaces of a pair of adhesive members are adhered with an adhesive, and a main adhesive is linearly applied to one of the adhesive surfaces, After the two adhesive surfaces are brought close to each other so that a ridge-shaped protrusion provided on the other of the adhesive surfaces and protruding from the adhesive surface comes into contact with the main adhesive from the most protruding tip of the protrusion The main adhesive is cured and bonded.

  An adhesive structure according to the present invention that achieves the above object is an adhesive structure in which the respective adhesive surfaces of a pair of adhesive members are bonded via a bonding portion, and the other of the bonded surfaces is the most from the bonded surface. A ridge-shaped protrusion having a protruding tip is formed, and the two adhesive surfaces are brought close to a main adhesive applied linearly on one of the adhesive surfaces so that the protrusion contacts the tip. Thereafter, the main adhesive is cured to form a joint portion.

  In the bonding method according to the present invention configured as described above, the main adhesive is spread from the tip of the protrusion toward the skirt in order to bring the ridge-like protrusion close to the main adhesive from the tip. Therefore, since the flow of the main adhesive can be controlled in the skirt direction of the protruding portion, the generation of voids can be suppressed and peeling of the adhesive surface can be suppressed.

  In the adhesive structure according to the present invention configured as described above, since the pair of adhesive members are bonded so that the ridge-shaped protrusion is in contact with the main adhesive from the tip, the main adhesive is the protrusion of the protrusion. It is spread from the tip to the skirt. Therefore, the flow of the main adhesive is controlled in the skirt direction of the protruding portion, the generation of voids is suppressed, and the adhesive surface is difficult to peel off.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  1 is a perspective view showing an adhesive structure according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a perspective view for explaining a state before the adhesive structure is bonded. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3, FIG. 5 is a cross-sectional view for explaining the flow of the main adhesive during bonding of the same adhesive structure, and FIG. 6 is another application of the main adhesive. The top view of the 2nd adhesion member for explaining an example, Drawing 7 is a graph which shows the shear stress distribution of the joined part in this embodiment.

  As shown in FIGS. 1 and 2, the bonding structure 1 according to the first embodiment is formed by bonding a pair of first bonding member 2 and second bonding member 3 to each other and the first and second bonding members 2 and 3. And a bonding agent holding portion 5 provided on the outer periphery of the bonding portion 4. The joining portion 4 and the adhesive holding portion 5 are formed by curing a main adhesive 6 and an auxiliary adhesive 7 which will be described later.

  The first adhesive member 2 and the second adhesive member 3 are made of, for example, FRP (reinforced plastic) and have a first adhesive surface 11 and a second adhesive surface 12 that are bonded to each other. In addition, the material of the 1st adhesive member 2 and the 2nd adhesive member 3 is not limited, Another material may be sufficient.

  The first adhesive surface 11 is formed with a ridge-like protrusion 14 protruding from the flat first flat surface portion 13, and the protrusion 14 gradually decreases in height from the most protruding tip portion 15 in the skirt direction. It is formed.

  The second adhesive surface 12 is provided with a groove-shaped concave portion 17 that is recessed from the planar second planar portion 16 and extends along the ridge line of the protruding portion 14. The depth of the recess 17 is shallower than the height of the protrusion 14, and the curvature radius of the protrusion 14 is smaller than the curvature radius of the recess 17. Therefore, the tip 15 of the protrusion 14 is in contact with the deepest part 18 of the recess 17, and an adhesive layer having an adhesive gap X between the first flat part 13 and the second flat part 16 is formed. The bonding gap X is set to an optimum length for bonding, and is, for example, 0.7 mm.

  The adhesive holding part 5 is provided on the outer periphery of the joint part 4 between the first adhesive surface 11 and the second adhesive surface 12.

  Next, the bonding method according to this embodiment will be described.

  First, as shown in FIGS. 3 and 4, the auxiliary adhesive 7 is applied to the second flat surface portion 16 and the end portions of the concave portion 17 so as to surround the concave portion 17 on the second adhesive surface 12. At this time, it is preferable that the auxiliary adhesive 7 is provided with one or more discontinuous cuts 19. Moreover, it is preferable that the 2nd adhesive surface 12 to which the main adhesive agent 6 and the auxiliary | assistant adhesive agent 7 are apply | coated is arrange | positioned facing upwards so that the adhesive agents 6 and 7 may not droop in an adhesion | attachment process.

  The auxiliary adhesive 7 is faster-curing than the main adhesive 6 described later, and has a higher tensile elongation and higher viscosity than the main adhesive 6. The tensile elongation of the auxiliary adhesive 7 is preferably 4 to 200%, and more preferably 10 to 100%. The viscosity of the auxiliary adhesive 7 is preferably 10 to 300 Pa · s, and more preferably 50 to 200 Pa · s.

  Further, a disassembling adhesive is applied to the auxiliary adhesive 7. A demolition adhesive is an adhesive that exhibits a sufficient adhesive force during bonding, but loses the adhesive force by applying an external stimulus such as heating or water supply, and is separated. The decomposable adhesive contains a filler such as a microballoon or a thermally expandable graphite that contains a liquid that is gasified by heat, such as a thermoplastic resin that melts and disassembles by heat (hot melt type). And the like that expand and separate when heated.

  After the auxiliary adhesive 7 is applied to the second adhesive surface 12, the auxiliary adhesive 7 is cured on the second adhesive surface 12, and the adhesive holding portion 5 is formed. At this time, since the auxiliary adhesive 7 is a fast-curing type, it is cured in a short time and has excellent processability in the production line. Further, since the auxiliary adhesive 7 has a high tensile elongation and a high viscosity, the auxiliary adhesive 7 hardly sags and can be cured while maintaining the shape when applied. In addition, after apply | coating the auxiliary adhesive 7 to the 2nd adhesive surface 12, and making the 1st adhesive surface 11 approach the 2nd adhesive surface 12 until the auxiliary adhesive 7 contacts the 1st adhesive surface 11 in the process mentioned later. The auxiliary adhesive 7 may be cured. In this case, since the auxiliary adhesive 7 is a fast-curing type, it can be cured in a short time and the member can be temporarily fixed, so that the processability in the production line is excellent.

  Next, the main adhesive 6 is applied in a linear form so as to cover at least a part of the deepest portion 18 corresponding to the tip portion 15 in a portion surrounded by the adhesive holding portion 5 of the concave portion 17 of the second adhesive surface 12. To do. In the present embodiment, the main adhesive 6 is applied linearly corresponding to the shape of the concave portion 17 (the deepest portion 18), but the main adhesive is included so as to include at least a part of the position corresponding to the tip portion 15. If 6 is applied, the shape is not limited, and for example, it may be applied in a wave shape as shown in FIG.

  The main adhesive 6 has a lower viscosity than the auxiliary adhesive 7 and has higher rigidity than the auxiliary adhesive 7 when cured. The tensile rigidity when the main adhesive 6 is cured is preferably 2 to 5 GPa, and more preferably 3 to 4 GPa. The viscosity of the main adhesive 6 is preferably 0.01 to 10 Pa · s, and more preferably 0.1 to 5 Pa · s.

  Various adhesives such as a thermosetting resin and a thermoplastic resin can be applied to the main adhesive 6.

  The main adhesive 6 is easy to sag when applied due to its low viscosity, but the second adhesive surface 12 is arranged facing upward, the outer periphery of the recess 17 is surrounded by the adhesive holding part 5, and the main adhesive 6 Since the adhesive 6 is applied in the concave portion 17, the main adhesive 6 can be prevented from dripping from the second adhesive surface 12.

  Next, as shown in FIG. 5, the first adhesive surface 11 is brought close to the second adhesive surface 12, and the protruding portion 14 is fitted into the concave portion 17 so as to come into contact with the main adhesive 6 from the distal end portion 15. At this time, since the radius of curvature of the protrusion 14 is smaller than the radius of curvature of the recess 17, the main adhesive 6 comes into contact with the main adhesive 6 from the tip 15 of the protrusion 14. It is pushed and spread while flowing in a direction (a direction from the tip portion 15 toward the first flat surface portion 13, see an arrow in FIG. 5). Therefore, it is difficult for air to be caught in the main adhesive 6 and the generation of voids can be suppressed. Moreover, since the front-end | tip part 15 of the protrusion part 14 contacts the recessed part 17, the thickness of the junction part 4 can be controlled and a dispersion | variation can be reduced, without putting the filler for thickness control into the main adhesive agent 6. FIG.

  The spread main adhesive 6 is in contact with the adhesive holding part 5, but the air existing between the adhesive holding part 5 and the main adhesive 6 is between the adhesive holding part 5 and the first adhesive surface 11. It is discharged from the gap and the cut 19. Therefore, even between the adhesive holding part 5 and the main adhesive 6, it is difficult for air to be caught, and generation of voids can be suppressed. In addition, when the adhesive holding | maintenance part 5 is higher than the adhesion space | interval X, since the adhesive holding | maintenance part 5 has high tensile elongation, it is crushed easily. Moreover, the height of the adhesive holding part 5 may be lower than the bonding interval X.

  Thereafter, the main adhesive 6 is cured to form the joint 4 and the bonding is completed.

  As described above, according to the bonding method described above, the main adhesive 6 that is highly rigid but has low viscosity and is easy to sag can be applied while suppressing the occurrence of sagging, and the generation of voids is suppressed by suppressing the occurrence of voids. it can. Further, in the bonded adhesive structure 1, the adhesive holding part 5 has a high tensile elongation, and the first adhesive surface 11 and the second adhesive surface 12 are unlikely to peel off.

  Moreover, since the main adhesive 6 is pushed and expanded in the skirt direction by the protrusions 14, the adhesive can be spread over a wide range without applying the adhesive in a plurality of lines. Therefore, for example, when an adhesive is applied in a plurality of lines, air is easily caught between the lines and voids are easily generated. However, compared to this case, voids are less likely to occur, and the first adhesive surface 11 and The second adhesive surface 12 is unlikely to peel off.

  For example, when an adhesive having a high tensile elongation and a high viscosity (for example, auxiliary adhesive 7) is used on the entire surface of the adhesive surface, the adhesive is difficult to drip and strong against peeling, but air is easily taken in and bonding efficiency is low. Become. Further, when a high-rigidity, low-viscosity adhesive (for example, main adhesive 6) is used on the entire surface, the shearing efficiency is high, but peeling is likely to occur, and the adhesive tends to sag. However, according to the bonding method according to the present embodiment, by using two adhesives, a highly rigid bonding structure 1 can be realized while suppressing dripping and peeling (see FIG. 7).

  In addition, since the disassembling adhesive is applied to the auxiliary adhesive 7, the first adhesive surface 11 and the second adhesive surface 12 can be easily formed by causing separation in the auxiliary adhesive 7 when the structure is disassembled. Can be dismantled. In addition, when the disassembling adhesive contains an expandable filler, the adhesive is often high in viscosity and inferior in handleability, so that it is applied to the entire first adhesive surface 11 and the second adhesive surface 12. However, since the main adhesive 6 is used at the same time, the rigidity is also maintained.

  FIG. 8 is a cross-sectional view showing a modified example of the adhesive structure according to the present embodiment, FIG. 9 is a cross-sectional view showing another modified example of the adhesive structure according to the present embodiment, and FIG. 10 further shows the adhesive structure according to the present embodiment. Sectional drawing which shows another modification, FIG. 11: is sectional drawing which shows the further another modification of the adhesive structure which concerns on this embodiment. In addition, about the site | part which has the function similar to the above-mentioned embodiment, in order to avoid duplication, the description is abbreviate | omitted.

  As a modification of the bonding structure according to the present embodiment, as shown in FIG. 8, two or more protrusions 14 and two recesses 17 (two in this modification) can be provided.

  Further, as another modification of the bonding structure according to the present embodiment, as shown in FIG. 9, the concave portion 17 may not be provided on the second bonding surface 12. In addition, although the two protrusion parts 14 are provided in the modification of FIG. 9, one may be sufficient and three or more may be sufficient.

  As still another modification of the bonding structure according to the present embodiment, as shown in FIG. 10, a protrusion 14 may be provided on each of the first bonding surface 11 and the second bonding surface 12. In addition, the protrusion part 14 may be three or more.

  As still another modification of the bonding structure according to the present embodiment, as shown in FIG. 11, a protrusion 14 and a recess 17 may be provided on each of the first bonding surface 11 and the second bonding surface 12. . In addition, the protrusion part 14 and the recessed part 17 may be three or more.

  Even in the forms of these modified examples shown in FIGS. 8 to 11, since the main adhesive 6 is brought into contact with the main adhesive 6 from the tip 15 of the protrusion 14, the generation of voids is suppressed and the generation of voids is suppressed. The peeling of the first adhesive surface 11 and the second adhesive surface 12 can be suppressed.

  12 is an exploded perspective view showing a vehicle body structure to which the adhesive structure according to this embodiment is applied, FIG. 13 is a perspective view showing a vehicle body structure to which the adhesive structure is applied, and FIG. 14 is taken along line XIV-XIV in FIG. It is a fragmentary perspective view which shows the torn surface which follows.

  An example in which the bonding structure 1 according to the present embodiment is applied to the vehicle body structure 20 is shown in FIGS. As shown in FIG. 12, the vehicle body structure 20 includes a rear floor 21 that is a first adhesive member and a front floor 22 that is a second adhesive member. The rear floor 21 and the front floor 22 are made of carbon fiber reinforced plastic (CFRP).

  The rear floor 21 is provided with a first adhesive surface 23, and a protrusion is formed on the first adhesive surface 23. The front floor 22 is provided with a second adhesive surface 24, and a recess is formed in the second adhesive surface 12. By applying the above-described bonding method to the rear floor 21 and the front floor 22, the rear floor 21 and the front floor 22 can be bonded as shown in FIGS.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, the auxiliary adhesive 7 may not be a dismantling adhesive, or the auxiliary adhesive 7 may not be provided. Further, the main adhesive 6 may be applied discontinuously, for example, having a plurality of cuts.

It is a perspective view showing the adhesion structure concerning the embodiment of the present invention. It is sectional drawing which follows the II-II line | wire of FIG. It is a perspective view for demonstrating before adhesion of the adhesion structure. It is sectional drawing which follows the IV-IV line of FIG. It is sectional drawing for demonstrating the flow of the main adhesive agent at the time of adhesion | attachment of the adhesion structure. It is a top view of the 2nd adhesion member for explaining other examples of application of the main adhesive. It is a graph which shows the shear stress distribution of the junction part in this embodiment. It is sectional drawing which shows the modification of the adhesion structure which concerns on this embodiment. It is sectional drawing which shows the other modification of the adhesion structure which concerns on this embodiment. It is sectional drawing which shows the further another modification of the adhesion structure which concerns on this embodiment. It is sectional drawing which shows the further another modification of the adhesion structure which concerns on this embodiment. It is a disassembled perspective view which shows the vehicle body structure to which the adhesion structure concerning this embodiment is applied. It is a perspective view which shows the vehicle body structure to which the same adhesion structure was applied. It is a fragmentary perspective view which shows the torn surface which follows the XIV-XIV line | wire of FIG.

Explanation of symbols

1 Adhesive structure,
2 first adhesive member,
3 Second adhesive member,
4 joints,
5 Adhesive holding part,
6 Main adhesive,
7 Auxiliary adhesive,
11 First adhesive surface,
12 Second adhesive surface,
13 1st plane part,
14 protrusions,
15 tip,
16 2nd plane part,
17 recess,
18 deepest part,
19 Cut,
X Adhesion interval.

Claims (19)

An adhesion method for adhering each adhesion surface of a pair of adhesive members with an adhesive,
A main adhesive is linearly applied to one of the bonding surfaces, and a ridge-shaped protruding portion provided on the other of the bonding surfaces and protruding from the bonding surface is moved from the most protruding tip of the protruding portion to the main surface. An adhesion method comprising: adhering the main adhesive after curing the two adhesion surfaces so as to be in contact with the adhesive.   The bonding method according to claim 1, wherein the main adhesive applied to one of the bonding surfaces is applied to a recess formed on one of the bonding surfaces in which the protruding portion is accommodated.   The bonding method according to claim 1, wherein a radius of curvature of the protruding portion is smaller than a radius of curvature of the concave portion.   The bonding method according to claim 2, wherein a height of the protruding portion is higher than a depth of the concave portion.   The bonding method according to any one of claims 1 to 4, wherein one of the bonding surfaces to which the main adhesive is applied is arranged facing upward.   Before applying the main adhesive to one of the adhesive surfaces, an auxiliary adhesive having a higher tensile elongation and higher viscosity than the main adhesive is provided on the outer periphery of the portion of the adhesive surface to which the main adhesive is applied. The adhesion method according to any one of claims 1 to 5, wherein: is applied.   The bonding method according to claim 6, wherein the main adhesive has higher rigidity than the auxiliary adhesive when cured.   The bonding method according to claim 6 or 7, wherein the auxiliary adhesive is applied with a cut so as to be discontinuous.   The bonding method according to any one of claims 6 to 8, wherein the auxiliary adhesive is faster-curing than the main adhesive.   The adhesion method according to claim 6, wherein the auxiliary adhesive is a disassembling adhesive. An adhesive structure in which the respective adhesive surfaces of the pair of adhesive members are joined via a joint portion,
On the other side of the bonding surface, a ridge-shaped protruding portion having a tip portion that protrudes most from the bonding surface is formed, and the protruding portion extends to the main adhesive applied linearly on one side of the bonding surface. An adhesive structure in which the two adhesive surfaces are brought close to each other so as to come into contact with each other and then the main adhesive is cured to form a joint.   The adhesive structure according to claim 11, wherein a concave portion in which the joint portion and the protruding portion are accommodated is formed on one of the adhesive surfaces.   The adhesive structure according to claim 11 or 12, wherein a curvature radius of the protrusion is smaller than a curvature radius of the recess.   The adhesive structure according to claim 12 or 13, wherein a height of the protruding portion is higher than a depth of the concave portion.   The outer periphery of the said junction part in the said adhesive surface has an adhesive holding | maintenance part which is higher tensile elongation than the said main adhesive agent, and the auxiliary adhesive of high viscosity hardened | cured. The adhesion structure according to any one of the above.   The bonding method according to claim 15, wherein the joint portion is higher in rigidity than the adhesive holding portion.   The adhesive structure according to claim 15 or 16, wherein the adhesive holding part has a discontinuous cut.   The adhesive structure according to any one of claims 15 to 17, wherein the auxiliary adhesive is faster-curing than the main adhesive.   The adhesive structure according to any one of claims 15 to 18, wherein the auxiliary adhesive is a disassembling adhesive.

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