JP2832830B2 - Body panel with honeycomb sandwich structure and method of forming the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vehicle body panel such as an automobile floor panel or a dashboard panel, and more particularly to a honeycomb core sandwiched between an upper surface plate and a lower surface plate. The present invention relates to a body panel having a honeycomb sandwich structure and a method for forming the same.

(Prior Art) Generally, a floor panel constituting a cabin floor of an automobile has one
It is formed by a single plate. In this case, in order to make the vehicle floor as flat as possible, it is required to provide a wide flat portion on the floor panel. However, in the case of a floor panel made of a single plate, if the area of the plane portion is increased, the rigidity of the portion is reduced, and surface vibrations occur with the vehicle body vibration. Therefore, a reinforcing member such as a cross member is attached to the floor panel to ensure its rigidity.

Further, the floor panel is also required to have a role of suppressing vibration of the entire floor portion and blocking noise transmitted to the vehicle interior. Therefore, a mel sheet or an insulator is attached to the floor panel to improve its vibration damping and sound insulation.

However, if such a cross member or insulator is attached, the weight of the vehicle body will inevitably increase. Further, even if a cross member or the like is attached, the rigidity of the entire floor panel cannot be uniformly increased.

For this reason, as shown in Japanese Utility Model Laid-Open No. 57-133479 and the like, the floor panel is formed by a honeycomb sandwich structure panel in which a plate-shaped honeycomb core is sandwiched between an upper surface plate and a lower surface plate. It is thought to form. Such a honeycomb panel has extremely high rigidity while being lightweight, and has excellent sound insulation. Therefore,
By using a floor panel having such a honeycomb sandwich structure, it becomes possible to make the plane portion of the vehicle cabin floor surface large.

Incidentally, the left and right side edges of the floor panel need to be fixed to a vehicle body strength member such as a side sill. In that case, if the floor panel has a honeycomb sandwich structure, the panel has a large gap with the honeycomb core sandwiched between the upper surface plate and the lower surface plate, so it can be simply spot welded or bolted Therefore, it cannot be connected to another member. Therefore, for example, as shown in the above publication, a horizontal projection is provided on the side sill,
It is necessary to employ a special fixing means such as fitting the protrusion between the upper surface plate and the lower surface plate of the floor panel. However, in order to adopt such fixing means, it is necessary to significantly change the conventional vehicle body assembly line.

For this reason, a honeycomb sandwich structure is obtained by using a conventional floor panel made of a single plate, that is, a body structure panel as it is as a lower plate of a honeycomb sandwich structure and joining a honeycomb core and an upper plate to the upper surface thereof. It is considered to form a floor panel. By doing so, on the vehicle body assembly line, the lower plate of the honeycomb sandwich structure can be formed in the same manner as a conventional floor panel, and can be fixed to a side sill or the like.

(Problems to be Solved by the Invention) However, a honeycomb core of a honeycomb panel used for an automobile is generally formed of paper. Therefore, the honeycomb core must be bonded to the upper and lower plates by bonding. Moreover, in the case of a floor panel, the area is extremely large. Therefore, if the honeycomb cores are to be joined on the vehicle body assembly line, it is necessary to newly establish a bonding process in the conventional vehicle body assembly line. In addition, since it is necessary to secure time for the adhesive to harden, it is necessary to coordinate with other steps of the assembly line.

Furthermore, in order for the features of the honeycomb sandwich structure to be exhibited, the honeycomb core and the upper surface plate and the lower surface plate must be securely joined, but since the cell walls constituting the honeycomb core are extremely thin, The honeycomb core is in line contact with the upper surface plate and the lower surface plate. It is almost impossible to reliably bond such line-contacting parts in a vehicle body assembly line. In addition, the surface accuracy between both surfaces of the honeycomb core and the honeycomb core joining surfaces of the upper surface plate and the lower surface plate must be increased. However, when the lower surface plate is formed on a vehicle body assembly line, the surface accuracy may be secured. Extremely difficult.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a honeycomb having high rigidity, sound insulation, and vibration damping properties in which a honeycomb core is securely bonded to an upper surface plate and a lower surface plate. The goal is to obtain a sandwich structure body panel.

Another object of the present invention is to provide such a honeycomb sandwich-structured vehicle body panel using a conventional vehicle body assembly line.

(Means for Solving the Problems) In order to achieve this object, according to the present invention, a plate-shaped honeycomb core having an upper surface plate bonded to one surface and an adhesive bonded to the other surface of the honeycomb core are provided. A body plate having a honeycomb sandwich structure is constituted by the auxiliary plate and a body structure panel to which the adhesion auxiliary plate is bonded via a melt sheet.

Then, a top honeycomb plate and an adhesive auxiliary plate are joined to both surfaces of the honeycomb core in advance to form a sub-honeycomb panel, and the adhesive auxiliary plate of the sub-honeycomb panel is washed with water in a body painting process and then applied to a body structural panel by a melt sheet. By bonding, a body panel having a honeycomb sandwich structure is constructed.

(Operation) With this configuration, the honeycomb core is bonded to the vehicle body structural panel serving as the lower surface plate via the bonding auxiliary plate and the melt sheet. Therefore, the honeycomb core side and the lower plate are bonded face to face. Moreover, the errors in the surface accuracy are absorbed by the melt sheet.
And since the joining of the honeycomb core with the upper surface plate and the adhesion auxiliary plate can be performed separately from the vehicle body assembly line,
It can be reliable and strong. As a result, the honeycomb core and the lower surface plate, that is, the vehicle body structural panel are securely bonded.

Further, by using the mel sheet, a vibration damping effect can be obtained, and the vibration damping property is improved. Since the lower panel side is double of the vehicle body structural panel and the bonding auxiliary plate for shielding, the rigidity and sound insulation are further improved.

Further, the body structure panel serving as the lower surface plate is formed in the same process as the conventional body assembly line. Then, the pre-formed sub-honeycomb panel is attached to the vehicle body via a mel sheet after washing in the vehicle body painting process, so that the sub-honeycomb panel is bonded using the conventional mel sheet attaching process in the vehicle body assembly line. can do. Therefore, it is not necessary to significantly change the conventional body assembly line. In addition, since the setting of the sub-honeycomb panel is performed after the washing, the honeycomb core does not get wet and weaken.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a floor panel which is an embodiment of a car body panel having a honeycomb sandwich structure according to the present invention. FIG. 1 is an exploded perspective view thereof, and FIG. 2 is a vertical sectional view of the car body left-right direction. .

As is apparent from these figures, a pair of side sills 1, 1 extending in the front-rear direction are provided on the left and right sides of the vehicle body floor portion at positions corresponding to the cabin floor surface. Also,
A pair of center frames 2, 2 extending in the front-rear direction is provided at the center of the vehicle body between the side sills 1, 1. One large panel 3 is arranged between the left and right side sills 1. The large panel 3 is similar to a floor panel in a normal vehicle body structure, and has flanges 4 on both right and left edges thereof, and is joined to the side sill 1 by the flanges 4. A center tunnel 5 is formed in the center of the panel 3, and the center tunnel 5 is joined to the center frames 2, 2. Therefore, the large panel 3 is a panel forming a vehicle body structure, that is, a vehicle body structure panel.

Large-area recesses 6, 6 are formed in a portion of the body structure panel 3 extending from the center tunnel 5 to the left and right side sills 1, 1. The bottom surface 7 of the recess 6 is flat. That is, the bottom surface 7 is a large-area flat plate portion.

A melt sheet 8 is provided on the bottom surface 7 of the recess 6. The sub-honeycomb panel 9 is bonded by the melt sheet 8. The sub honeycomb panel 9
The upper surface plate 11 and the bonding auxiliary plate 12 are respectively joined to the upper and lower surfaces of the plate-shaped honeycomb core 10. The honeycomb core 10 and the bonding auxiliary plate 12 are sized to be accommodated in the recess 6. Is the bottom surface 7 of the recess 6
It is designed to be adhered to. The upper surface plate 11 is made of a steel plate thinner than the body structure panel 3, or an aluminum plate, a resin plate,
It is made of paper or the like, and its peripheral portion is joined to the outer peripheral portion of the concave portion 6 via a sealing material such as a sealer. Further, the bonding auxiliary plate 12 is a thinner steel plate, an aluminum plate,
It is formed of a resin plate, paper, or the like. The honeycomb core 10 formed of paper is joined to the upper surface plate 11 and the adhesion auxiliary plate 12 by an adhesive.

Thus, the floor surface of the passenger compartment between the center tunnel 5 and the side sills 1, 1 is a honeycomb sandwich panel 13 having the honeycomb core 10 sandwiched between the upper surface plate 11 and the body structure panel 3. Therefore, the body structure panel 3 is
The honeycomb sandwich structure serves as a bottom plate.

Next, a method of constructing the floor panel 13 having such a honeycomb sandwich structure will be described.

First, on a separate line from the vehicle body assembly line, the upper surface plate 11 and the bonding auxiliary plate
12 are bonded to form a sub-honeycomb panel 9 having a predetermined shape. By doing so, the assembly process of the sub-honeycomb panel 9 does not affect other processes of the vehicle body assembly line, so that the honeycomb core 10 is securely and firmly joined to the upper surface plate 11 and the adhesion auxiliary plate 12. It can be.

Then, as shown in FIG. 1, the melt sheet 8 is temporarily bonded to the bonding auxiliary plate 12 of the sub-honeycomb panel 9, and these are unitized.

On the other hand, in the vehicle body assembly line, a vehicle body structural panel 3 is formed in the same manner as a conventional floor panel, and is joined to the side sill 1 and the center frame 2. Next, they are washed with water and dried in a coating process.

The unitized mel sheet 8 and sub-honeycomb panel 9 are carried into the body assembly line after rinsing in a painting process, that is, on a line corresponding to a conventional mel sheet attaching process. In this case, the sub-honeycomb panel 9 is formed by joining the upper surface plate 11 and the adhesion auxiliary plate 12 to both surfaces of the honeycomb core 10, respectively, and has a large honeycomb sandwich structure. There is no. Therefore, it can be easily carried in.

In the car body assembly line, the carried-in unit is
It is set on the bottom surface 7 of the concave portion 6 of the vehicle body structure panel 3 in the same manner as in the conventional work of attaching a melt sheet. Then, the heat of drying the vehicle body or the residual heat causes the melt sheet 8 to melt. The sub-honeycomb panel 9 is cooled and hardened with the subsequent cooling of the vehicle body.
Is bonded to the vehicle body structural panel 3.

In this manner, the honeycomb core 10 is bonded to the vehicle body structural panel 3 serving as the lower surface plate via the flat bonding auxiliary plate 12. Therefore, the bonding is performed between the surfaces, and the bonding area is sufficiently large. Also, if there is an error in the surface accuracy of the bonding surface of the bonding auxiliary plate 12 or the body structure panel 3, the error is also detected by the melt sheet 8.
Is absorbed by As a result, the sub-honeycomb panel 9
The joint strength between the vehicle body panel 3 and the vehicle body structure panel 3 is sufficiently stable.

Thus, the floor panel 13 having the honeycomb sandwich structure can be used with almost no change in the conventional body assembly line.
Is formed. In this case, since the sub-honeycomb panel 9 is set after washing in the painting process of the vehicle body assembly line, the paper honeycomb core 10 is not damaged by the washing. Further, the upper surface plate 11 and the adhesion auxiliary plate 12 can also be made of paper.

In the floor panel 13 formed as described above, the melt sheet 8 used as an adhesive exerts a vibration damping action, so that the floor panel 13 has an extremely high damping function in combination with the vibration damping function of the honeycomb sandwich structure. It has a vibration property. Further, as compared with the ordinary honeycomb sandwich structure, the lower plate side has a double structure of the vehicle body structure panel 3 and the adhesion auxiliary plate 12, so that the rigidity and the sound insulation properties are remarkably improved. Accordingly, the floor surface of the passenger compartment can be made a sufficiently wide plane. By using the same body structure panel 3 as the conventional floor panel, the strength is secured by the panel 3,
As the upper surface plate 11 and the bonding auxiliary plate 12 constituting the honeycomb sandwich structure, a thin and lightweight one can be used,
An increase in weight can be suppressed. In particular, the adhesive auxiliary plate 12
Since it only needs to have a function of securing the bonding area, it can be made extremely thin.

In the above embodiment, the recess 6 is provided in the vehicle body structure panel 3 and the sub-honeycomb panel 9 is accommodated in the recess 6. However, the vehicle body structure panel 3 is a flat plate, and the sub honeycomb panel 9 is provided on the upper surface thereof. Can also be placed. However, in order to make the vehicle cabin floor completely flat and to increase the rigidity of the vehicle body structural panel 3 itself, it is desirable to configure as in the above embodiment.

In the above embodiment, the sub-honeycomb panel 9
The mel sheet 8 is temporarily adhered to the vehicle body assembly line, and the mel sheet 8 is transported to the vehicle body assembly line in a unitized state. The sub-honeycomb panel 9 may be set.

Furthermore, although an example in which the floor panel 13 is formed in a honeycomb sandwich structure has been described, the present invention is not limited to this, and can be applied to a case where another vehicle body panel such as a dashboard panel has a honeycomb sandwich structure.

(Effects of the Invention) As is apparent from the above description, according to the present invention, an auxiliary bonding plate is joined to one surface of a honeycomb core, and the auxiliary bonding plate and the vehicle body structural panel are bonded by a melt sheet. Therefore, by joining the honeycomb core and the bonding auxiliary plate in advance, the honeycomb core side and the vehicle body structural panel are bonded face to face.
Therefore, the bonding can be made stable and reliable, and the bonding operation can be performed on the vehicle body assembly line.

And by using a melt sheet for the adhesion,
An extremely high vibration damping property can be provided to the body panel having the honeycomb sandwich structure. Moreover, since the lower plate side is formed in a double structure by the vehicle body structure panel and the adhesion auxiliary plate, the rigidity and sound insulation can be further improved as compared with a panel having a normal honeycomb sandwich structure.

Further, according to the present invention, a top honeycomb plate and an adhesion auxiliary plate are joined to a honeycomb core in advance to form a sub-honeycomb panel, and the sub-honeycomb panel is adhered to a car body structural panel by a mel sheet after water washing in a car body painting process. Therefore, the bonding operation can be performed by a mel sheet attaching process in a conventional vehicle body assembly line.
Therefore, it is possible to obtain a body panel having a honeycomb sandwich structure without changing the conventional body assembly line. Then, by assembling the sub-honeycomb panel after washing with water, the sub-honeycomb panel does not get wet with water, so that not only the honeycomb core but also the top plate and the adhesion auxiliary plate are made of paper. be able to. This makes it possible to obtain an inexpensive body panel having a honeycomb sandwich structure that does not generate rust or the like.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an example of a floor panel having a honeycomb sandwich structure to which the present invention is applied, and FIG. 2 is a cross-sectional view of the floor panel. 3 ... body structure panel, 8 ... melt sheet 9 ... sub-honeycomb panel 10 ... honeycomb core, 11 ... top plate 12 ... bonding auxiliary plate 13 ... floor panel (body panel)

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Maeda 1-4-1, Chuo, Wako-shi, Saitama Pref. Inside the Honda R & D Co., Ltd. (72) Inventor Makoto Shiokawa 1-4-1, Chuo, Wako-shi, Saitama Pref. Within the Honda R & D Co., Ltd. (72) Inventor Tsuyoshi Yamashita 1-4-1, Chuo, Wako-shi, Saitama Prefecture, Inc. Inside Honda R & D Co., Ltd. (72) Mitsugu Nakamura 1-4-1, Chuo, Wako-shi, Saitama Co., Ltd. Within the Technical Research Institute (56) References JP-A-62-114034 (JP, A) JP-A-62-165043 (JP, A) JP-A-61-195828 (JP, A) JP-A-60-61375 (JP, A A) Japanese Utility Model Showa 62-174978 (JP, U) Japanese Utility Model Showa 62-139785 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B62D 25/20 G B60R 13/08

Claims (2)

(57) [Claims] 1. A honeycomb sandwich-structured vehicle body panel in which an upper surface plate and an adhesion auxiliary plate are respectively bonded to both surfaces of a plate-shaped honeycomb core, and the adhesion auxiliary plate is bonded to a vehicle body structural panel via a melt sheet. 2. A sub-honeycomb panel is formed by joining an upper surface plate and an adhesion auxiliary plate to both surfaces of a plate-shaped honeycomb core, and after washing with water in a vehicle body painting process, the adhesion auxiliary plate is formed by a melt sheet into a body structure. A method for forming a vehicle body panel having a honeycomb sandwich structure, wherein the sub-honeycomb panel is assembled to a vehicle body by bonding to the panel.