JP5123490B2 - Body structure and method for dismantling body structure - Google Patents

Description

  The present invention relates to a vehicle body structure and a method for dismantling the vehicle body structure.

  Currently, in a vehicle body structure, a structure in which carbon fiber reinforced plastic (CFRP) and steel are joined is used.

  In the bonding between CFRP and steel, an adhesive having a high bonding strength is used in order to maintain the bonding strength.

  However, when the bonded CFRP and steel are disassembled, they are broken by physical force, so that there is a problem that the recovery rate of CFRP is poor and the number of dismantling steps is large.

  In addition, since an adhesive having a high adhesive strength is used to maintain the adhesive strength, other components are destroyed during the replacement of the components, making replacement difficult.

  Moreover, although it is necessary to collect and collect CRRP and steel separately for recycling, parts are destroyed after being disassembled by physical force, and it is difficult to collect and collect them separately.

In addition, as a bonding method, there is a method of using a dismantling adhesive that exhibits sufficient adhesive force during bonding, but loses the adhesive force by applying an external stimulus such as heating or water supply, and is separated (Patent Document) 1), it is difficult to disassemble only a part of the adhesive parts when there are a plurality of adhesive parts.
JP 2003-276403 A

The present invention has been made to solve the problems associated with the prior art, the components such as C F RP and steel can separate collection, are possible parts replaced without destroying the other parts, and dismantling It is an object of the present invention to provide a vehicle body structure and a method for dismantling the vehicle body structure that can reduce man-hours.

The vehicle body structure according to the present invention that achieves the above object is a vehicle body structure in which a plurality of parts including parts made of carbon fiber reinforced plastics are bonded, and the dismantling temperature that is a temperature at which the adhesive force is weakened and separated is different. A plurality of adhesive portions respectively bonded by a plurality of disassembling adhesives separated by heating, wherein the plurality of adhesive portions are bonded to the one component in a state where the plurality of components are separated from each other; At least one of the adhesive part adheres the component made of the carbon fiber reinforced plastic, each disassemblable adhesive to be used in a plurality of the adhesive portion, corresponding to the dismantling to the order of bonding portions, demolition temperature It is characterized by being applied in order from a low decomposable adhesive.

A vehicle structure disassembly method according to the present invention that achieves the above object is a disassembly method of a vehicle body structure in which a plurality of parts including parts made of carbon fiber reinforced plastics are bonded, at a temperature at which the adhesive force is weakened and separated. The part having a plurality of adhesive parts bonded by a plurality of disassembling adhesives that are separated by heating and having different dismantling temperatures, and the plurality of adhesive parts separate the parts from each other. The vehicle body structure adhesion portion, in which at least one of the adhesion portions adheres the component made of the carbon fiber reinforced plastic, is heated in order from the adhesion portion to which the dismantling adhesive having a low dismantling temperature is applied. It is characterized by dismantling.

Vehicle body structure according to the present invention configured as described above, since the disassemblable adhesive is applied to the plurality of bonding portions having different dismantling temperatures, it can be selectively dismantled portion to be dismantled, for example, C F RP and steel Can be collected separately. Moreover, since it is adhered by a disassembling adhesive and can be selectively disassembled, it is possible to replace parts without destroying other parts. In addition, since a disassembling adhesive is used, it is not necessary to be destroyed by physical force, and the number of dismantling steps can be reduced.

  In the method for disassembling the vehicle body structure according to the present invention configured as described above, in order to disassemble the vehicle body structure having a plurality of adhesion portions bonded by a dismantling adhesive in the order of disassembly, Parts to be disassembled can be selectively separated. Moreover, since it is adhered by a disassembling adhesive and can be selectively disassembled, it is possible to replace parts without destroying other parts. In addition, since a disassembling adhesive is used, it is not necessary to be destroyed by physical force, and the number of dismantling steps can be reduced.

  Embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is a perspective view showing a front side member of a vehicle, and FIG. 2 is a perspective view showing a cover part of the vehicle.

  The member shown in FIG. 1 is a vehicle component, and is a front side member 1 provided between the front floor of the vehicle and the engine room. The front side member 1 has a steel front side member main body 2, an energy absorbing member 3 made of aluminum honeycomb, a suspension mounting bolt 4 made of steel, and a cover part 5 made of CFRP bonded to each other. The hatched portion in the figure indicates the energy absorbing member 2, the suspension mounting bolt 4, and the cover component 5. Further, a front floor (not shown) is bonded to the bonding portion 6 indicated by a one-dot oblique line in the drawing.

  As shown in FIG. 2, the cover part 5 made of CFRP is bonded to the front side member main body 2 at a cover bonding part 7 (shaded part) provided on the cover part 5.

  A disassembling adhesive is applied to the bonding portion between the parts to be bonded. 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.

  In the present embodiment, the adhesive between the front side member main body 2 and the energy absorbing member 3 is disassembled at a disassembly temperature of 200 degrees, and the adhesive between the front side member main body 2 and the suspension mounting bolt 4 is disassembled at the disassembly temperature. 210 degree disassembly adhesive, a disassembly adhesive having a disassembly temperature of 220 degrees at the adhesive portion between the front side member main body 2 and the cover part 5, and a disassembly temperature 230 at an adhesive portion between the front side member main body 2 and the front floor. Each degree of dismantling adhesive is applied.

  When disassembling the parts joined in this way, the energy absorbing member 3 can be removed by first heating the adhesive portion to which the disassembly adhesive having a disassembly temperature of 200 degrees is applied to 200 degrees. After that, similarly, by heating the adhesive parts to which the dismantling adhesives having the dismantling temperatures of 210 degrees, 220 degrees, and 230 degrees, respectively, are applied in order of increasing temperature to 210 degrees, 220 degrees, and 230 degrees, respectively. The suspension mounting bolt 4, the cover part 5, and the front floor can be removed in order. Thus, when disassembling, by heating to the respective dismantling temperatures in order from the disassembling adhesive having a low dismantling temperature, it is possible to dismantle in the targeted dismantling order and to simplify the dismantling process. .

  In addition, in the conventional method, an adhesive having a high adhesive strength is used to maintain the adhesive strength. Therefore, when replacing the components, components other than the components that require replacement are destroyed, making it difficult to replace the components. In the present embodiment, by replacing only the replacement part, it is possible to selectively replace parts without destroying other parts.

  Further, when the bonded CFRP and steel are disassembled, the conventional method is broken by physical force, so the recovery rate of CFRP is poor and the dismantling man-hour is large, but in this embodiment, the CFRP ( The cover part 5) can be disassembled without being destroyed, the recovery rate of CFRP can be improved, and the dismantling man-hour can be reduced.

Moreover, because of recycling it is necessary to sort and collect C F RP and steel or the like, there is no need to dismantle a physical force, part is easily collected separately without being destroyed.

Second Embodiment
FIG. 3 is an exploded perspective view showing the rear floor of the vehicle.

  The second embodiment relates to a rear floor of a CFRP vehicle body.

Li Afuroa 10 has a CFRP-made rear floor main body 11, and the rear floor body 1 1 and the other components is adhered by the adhesive 12, 13 and 14. The hatched portion in the figure indicates the above-mentioned bonding portion.

  As shown in FIG. 3, the rear panel 15 is bonded at the bonding portion 12, the first cross member 16 is bonded at the bonding portion 13, and the second cross member 17 is bonded at the bonding portion 14.

  A decomposable adhesive is applied to these adhesive portions 12, 13 and 14. Since the rear floor is not an engine peripheral part, the disassembly temperature of the applied disassembly adhesive can be set to 200 degrees or less.

  In the present embodiment, a disassembly adhesive having a disassembly temperature of 140 degrees is applied to the adhesive portion 12, and a disassembly adhesive having a disassembly temperature of 150 degrees is applied to the adhesive portions 13 and 14, respectively.

  Also in the second embodiment, as in the first embodiment, when disassembling, by heating to each dismantling temperature in order from the disassembling adhesive having a low dismantling temperature, it can be disassembled in the targeted dismantling order, It is possible to simplify the dismantling process.

  Since other effects are the same as those in the first embodiment, description thereof is omitted.

<Third Embodiment>
The third embodiment relates to a CFRP vehicle body in which a CFRP member is used.

  FIG. 4 is an exploded perspective view of a CFRP vehicle body.

  In the third embodiment, the components constituting the CFRP vehicle body 20 include a roof 21, a body side 22, a rear panel 23, a rear cross member 24, a par shell 25, a front member sloss 26, an outrigger 27, a front side member 28, and a cowl 29. , Dash 30, rear front 31 and front floor 32.

  Each part mentioned above is adhere | attached with the decomposable adhesive agent.

  Table 1 shows the dismantling temperature of the disassembling adhesive used for bonding each part.

  When dismantling the CFRP vehicle body 20, the temperature is increased stepwise by 10 degrees from 120 degrees to 260 degrees, and parts corresponding to the respective dismantling temperatures are disassembled. Thereby, the line-up of the dismantling process becomes possible, and the man-hours for dismantling can be reduced. Note that the disassembly order in this embodiment requires the use of a dismantling adhesive having a high disassembly temperature for engine peripheral parts that are at a high temperature, and therefore the order of the roof peripheral part, body peripheral part, rear peripheral part, and front peripheral part. It has become.

  FIG. 5 is a graph showing the relationship between the interval between the application positions of the disassembling adhesive (adhesion interval) and the disassembly temperature difference.

  When a plurality of dismantling adhesives having different dismantling temperatures are used, if the temperature difference between the dismantling temperatures is small, there is a possibility that the dismantling reaction proceeds even in the dismantling adhesive that is not desired due to temperature propagation of the parts. Therefore, as shown in FIG. 5, the bonding interval between the disassembling adhesives having a small dismantling temperature difference is set large. It is preferable that different dismantling adhesives have a temperature difference of 3 degrees or more and 5 degrees or less at least at the disassembling temperature. By setting the dismantling temperature in this way, disassembly reaction of other dismantling adhesives can be prevented even if other dismantling adhesives are heated by temperature propagation.

  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 present invention can be applied to products in which FRP parts are not used, and can also be applied to products other than vehicles. Moreover, if the space | interval of the adhesion parts to which a different demolition adhesive is applied is fully away from a viewpoint of temperature propagation, the demolition adhesive which has the same demolition temperature can be applied to a different adhesion part.

It is a perspective view which shows the front side member of a vehicle. It is a perspective view which shows the cover components of a vehicle. It is a disassembled perspective view which shows the rear floor of a vehicle. It is a disassembled perspective view of the CFRP vehicle body. It is a graph which shows the relationship between the space | interval of the application position of a dismantleable adhesive, and a dismantling temperature difference.

Explanation of symbols

1 Front side member,
2 Front side member body,
3 energy absorbing members,
4 Suspension mounting bolts,
5 Cover parts,
6 Bonding part,
7 Cover bonding part,
10 Li Afuroa,
11 Rear floor body,
12, 13, 14 Adhesive part,
15 Rear panel,
16 First cross member,
17 Second cross member,
20 CFRP body.

Claims (2)

A vehicle body structure in which a plurality of parts including parts made of carbon fiber reinforced plastic are bonded,
Having a plurality of adhesive portions respectively bonded by a plurality of decomposable adhesives separated by heating, having different dismantling temperatures, which are temperatures at which the adhesive force is weakened and separated,
The plurality of bonding portions are bonded to one component in a state where the plurality of components are separated from each other,
At least one of the bonding portions bonds a component made of the carbon fiber reinforced plastic,
Each disassemblable adhesive to be used in a plurality of the adhesive portion is a vehicle body structure, wherein in response to dismantling to the order of bonding portion, that it is applied in order from the lower demolition temperature disassemblable adhesive. A method of dismantling a vehicle body structure in which a plurality of parts including parts made of carbon fiber reinforced plastic are bonded,
It has a plurality of adhesive parts bonded respectively by a plurality of disassembling adhesives separated by heating and having different dismantling temperatures, which are temperatures at which the adhesive force is weakened and separated, and a plurality of the adhesive parts are a plurality of the parts Are bonded to one of the components in a state of being separated from each other, and a dismantling adhesive having a low dismantling temperature is applied to the bonding portion of the vehicle body structure in which at least one of the bonding portions bonds the component made of the carbon fiber reinforced plastic. A dismantling method for a vehicle structure, wherein the dismantling is performed by heating in order from the applied bonded portion.

Images