JPH01226479A - Body panel having honeycomb sandwich structure and forming method therefor - Google Patents

Abstract

PURPOSE:To obtain a body panel having high rigidity, noise block performance and vibration isolating performance where the honeycomb core is adhered reliably to the upper and lower face plates by adhering the auxiliary adhesive board on one face of the honeycomb to the body structure panel through a thermoplastic sheet. CONSTITUTION:A recess 6 is formed in the portion of a body structure panel 3 extending from the center tunnel 5 to the right and left side sills 1. A thermoplastic sheet 8 is arranged on the bottom face 7 of the recess 6. A sub- honeycomb panel 9 is formed by previously jointing an upper face plate 11 and an auxiliary adhesive board 12 to the upper and lower faces of a planar honeycomb core 10. The adhesive board 12 is washed with water in body painting process, then it is adhered through the thermoplastic sheet 8 to the body structure panel 3. Consequently, the honeycomb core is adhered reliably to the upper plate 11 and the lower plate (body structure panel).

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to vehicle body panels such as automobile floor panels and dash board panels, and in particular, the present invention relates to vehicle body panels such as automobile floor panels and dash board panels. The present invention relates to a vehicle body panel having a honeycomb sandwich structure and a method for forming the same.

(Prior Art) Generally, a floor panel forming the floor surface of an automobile cabin is formed of a single plate.

In that case, in order to make the cabin floor surface as flat as possible, the floor panel is required to have a wide flat area.

However, in a floor panel made of a single plate, if the area of the flat portion is increased, the rigidity of that portion decreases, causing surface vibrations to occur in conjunction with vehicle body vibrations. Therefore, reinforcing members such as cross members are attached to the floor panel to ensure its rigidity.

Floor panels are also required to play the role of suppressing vibrations throughout the floor and blocking noise transmitted into the vehicle interior. Therefore, a Melsheet or an insulator is attached to the floor panel to improve its vibration distribution and sound insulation properties.

However, if such a loss member or insulator is attached, the weight of the vehicle inevitably increases, and even if a cross member or the like is attached, the rigidity of the entire surface of the floor panel cannot be uniformly increased.

For this reason, as shown in Japanese Utility Model Application Publication No. 57-133479, etc., the floor panel is made of a panel with a honeycomb sandwich structure in which a plate-shaped honeycomb core is sandwiched between an upper surface plate and a lower surface plate. It is considered to form. Such honeycomb panels are lightweight, yet extremely rigid, and have excellent sound insulation properties. Therefore, by using a floor panel having such a honeycomb sandwich structure, it is possible to increase the planar area of the floor surface of the passenger compartment.

Incidentally, it is necessary to fix the left and right edges of the floor panel to a vehicle body strength member such as a side sill. In that case,
When a floor panel has a honeycomb sandwich structure, the panel has a large gap with a honeycomb core sandwiched between the top plate and bottom plate, so it can be simply spot welded or bolted to other parts. It will no longer be possible to combine. Therefore, for example, as shown in the above-mentioned publication, a special fixing means is adopted, such as providing a horizontal protrusion on the side sill and fitting the protrusion between the upper and lower plates of the floor panel. This is necessary. However, in order to employ such fixing means, it is necessary to significantly modify the conventional vehicle body assembly line.

For this reason, by using the conventional single-plate floor panel, that is, the car body structure panel, as the bottom plate of the honeycomb sandwich structure, and joining the honeycomb core and the top plate to the top surface, the honeycomb sandwich structure is created. It is being considered to form a floor panel. In this way, on the vehicle body assembly line, the honeycomb sandwich structure bottom plate can be formed in the same manner as a conventional floor panel, and it can be fixed to the side sill or the like.

(Problems to be Solved by the Invention) However, the honeycomb core of the 82-cam panel used in automobiles is generally made of paper. Therefore, the honeycomb core must be joined to the top and bottom plates by adhesive, and in the case of a floor panel, the area is extremely large. If it were to be carried out on line, it would be necessary to add a new bonding process to the conventional car body assembly line. Additionally, since time must be ensured for the adhesive to harden, coordination with other processes on the assembly line is also required.

Furthermore, in order to take advantage of the features of the honeycomb sandwich structure, the honeycomb core and the top and bottom plates must be reliably joined, but since the cell walls that make up the honeycomb core are extremely thin, The honeycomb core is in line contact with the top plate and the bottom plate. It is almost impossible to reliably bond such line-contacting parts on a car body assembly line.

In addition, the surface precision between both sides of the honeycomb core and the honeycomb core joining surfaces of the top and bottom plates must be high.
When forming the lower plate on a vehicle body assembly line, it is extremely difficult to ensure surface accuracy.

The present invention has been made in view of such problems, and its object is to provide a honeycomb core with high rigidity, sound insulation, and vibration damping properties, in which a honeycomb core and an upper surface plate and a lower surface plate are reliably bonded. The objective is to obtain a car body panel with a sandwich structure.

It is also an object of the present invention to enable such a honeycomb sandwich structure vehicle body panel to be formed using a conventional vehicle body assembly line.

(Means for Solving the Problems) In order to achieve this object, the present invention provides a plate-shaped honeycomb core having a top plate joined to the - side surface, and a honeycomb core having a top plate joined to the other side of the honeycomb core. A vehicle body panel having a honeycomb sandwich structure is constituted by the adhesion auxiliary plate and the vehicle body structure panel to which the adhesion auxiliary plate is adhered via the Mel sheet.

Then, a sub-honeycomb panel is formed by bonding a top plate and an adhesion auxiliary plate to both sides of the honeycomb core in advance, and the adhesion auxiliary plate of the sub-honeycomb panel is attached to the car body structural panel using Mel sheet after washing with water in the car body painting process. By gluing them together, a honeycomb sandwich structure of the vehicle body panels is constructed.

(Function) With this configuration, the honeycomb core is adhered to the vehicle body structure panel forming the lower surface plate via the adhesion auxiliary plate and the Melsheet. Therefore, the honeycomb core side and the lower plate are bonded face to face. Moreover, these errors in surface accuracy are absorbed by Melsheet.

Furthermore, since the joining of the honeycomb core to the top plate and the adhesion auxiliary plate can be performed separately from the car body assembly line,
It can be made reliable and strong. As a result, the honeycomb core and the lower surface plate, that is, the vehicle body structural panel, are reliably bonded to each other.

In addition, by using Melsheet, a vibration damping effect can be obtained, and the distribution performance can be improved. Furthermore, since the lower plate side is double-layered with the vehicle body structure panel and the adhesion auxiliary plate, the rigidity and sound insulation properties are further improved.

Additionally, the vehicle body structure panel that forms the bottom plate is molded in the same process as a conventional vehicle body assembly line. Then, by attaching the pre-formed sub-honeycomb panel to the car body via Melsheet after washing with water during the car body painting process, the subhoneycomb panel can be glued using the Melsheet pasting process on the conventional car body assembly line. can do. Therefore, there is no need to make any major changes to the conventional car body assembly line, and since the sub-honeycomb panels are set after washing, the honeycomb core does not become wet and weaken.

(Example) Hereinafter, the present invention will be explained in detail using the drawings.

The figure shows a floor panel which is an example of a car body panel with a honeycomb sandwich structure according to the present invention.
The figure is an exploded perspective view of the same, and FIG. 2 is a vertical sectional view of the vehicle body in the left-right direction.

As is clear from these figures, a pair of side sills 1.degree.l extending in the front-rear direction are provided on both left and right sides of the vehicle body floor at a position corresponding to the cabin floor surface. Also,
A pair of center frames 2.2 extending in the longitudinal direction are provided in 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 1.1. This large panel 3 is similar to a floor panel in a normal car body structure, and flanges 4.4 are provided on both left and right edges of the large panel 3, and is connected to the side sill l by the flanges 4. Further, a center tunnel 5 is formed in the center of the panel 3, and the center tunnel 5 is joined onto the center frame 2.2. Therefore, the large panel 3 is a panel forming the vehicle body structure, that is, a vehicle body structure panel.

A large-area recess 6.6 is provided in the portion of the vehicle body structure panel 3 extending from the center tunnel 5 to the left and right side sills 1.1.
is formed. The bottom surface 7 of the recess 6 is flat. That is, the bottom surface 7 is a flat plate portion with a large area.

A Mel sheet 8 is placed on the bottom surface 7 of the recess 6. Then, a sub-honeycomb panel 9 is bonded by the Mel sheet 8.

The sub-honeycomb panel 9 is made by bonding a top plate 11 and an adhesion auxiliary plate 12 to the upper and lower surfaces of a plate-shaped honeycomb core 10, respectively, and the honeycomb core 10 and the adhesion auxiliary plate 12 are sized to be accommodated in the recess 6. , its adhesion auxiliary plate 12
is adhered to the bottom surface 7 of the recess 6 by the Mel sheet 8. The top plate 11 is made of a steel plate, aluminum plate, resin plate, paper, etc. that is thinner than the vehicle body structural panel 3, and its peripheral part is joined to the outer peripheral part of the recess 6 through a sealing material such as seek. It has become. Further, the adhesion auxiliary plate 12 is formed of a thinner steel plate, aluminum plate, resin plate, paper, or the like. The honeycomb core 10 made of paper is bonded to the top plate 11 and the adhesion auxiliary plate 12 using an adhesive.

In this way, the floor surface of the vehicle compartment between the center tunnel 5 and the side sills 1.1 is formed into a panel 13 having a honeycomb sandwich structure in which the honeycomb core 10 is sandwiched between the top plate 11 and the vehicle body structure panel 3. Therefore, the vehicle body structure panel 3 forms the bottom plate of the honeycomb sandwich structure.

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

First, on a line separate from the vehicle body assembly line, the top plate 11 and the adhesion auxiliary plate 12 are bonded to both sides of the honeycomb core 10, respectively, to form the sub-honeycomb panel 9 in a predetermined shape. In this way, the assembly process of the sub-honeycomb panel 9 will not affect other processes on the car body assembly line, so the bonding between the honeycomb core 10, the top plate 11, and the adhesion auxiliary plate 12 will be ensured and strong. It can be made into something.

Then, as shown in FIG. 1, the Mel sheet 8 is temporarily adhered to the adhesion auxiliary plate 12 of the sub-honeycomb panel 9 to form a unit.

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

The unitized Melsheet 8 and sub-honeycomb panel 9 are carried into a car body assembly line after washing with water in the painting process, that is, onto a line corresponding to the conventional Melsheet pasting process. In that case, the sub-honeycomb panel 9 is made by bonding the top plate 11 and the adhesion auxiliary plate 12 to both sides of the honeycomb core 10, and has a honeycomb sandwich structure, so its rigidity is high and it does not bend. Therefore, it can be easily transported.

In the vehicle body assembly line, the unit carried in is set on the bottom surface 7 of the recess 6 of the vehicle body structure panel 3 in the same manner as in the conventional Mel sheet pasting operation. Then, the Melsheet 8 is melted by the heat generated during the drying of the vehicle body or its residual heat.

Then, as the vehicle body is subsequently cooled, the Melsheet 8 is cooled and hardened, so that the adhesion auxiliary plate 12 of the sub-honeycomb panel 9 and the vehicle body structure panel 3 are bonded together.

In this way, the honeycomb core IO is bonded to the vehicle body structure panel 3, which serves as the bottom plate, via the flat adhesion auxiliary plate 12. Therefore, the adhesion will be performed between surfaces, and the adhesion area will be sufficiently large. Further, even if there is an error in the surface precision of the bonding surfaces of the adhesion auxiliary plate 12 or the vehicle body structure panel 3, the error is absorbed by the Mel sheet 8. As a result, the bonding strength between the sub-honeycomb panel 9 and the vehicle body structure panel 3 becomes sufficiently stable.

In this way, the honeycomb sandwich structure floor panel 13 can be assembled without changing the conventional car body assembly line.
is formed. In that case, since the sub-honeycomb panel 9 is set after washing with water in the painting process of the car body assembly line, the paper honeycomb core 10 will not be damaged by the washing. It can be made of paper.

In the floor panel 13 formed in this manner, Melsheet 8 used as an adhesive exhibits a vibration damping effect, and in combination with the distribution function of the honeycomb sandwich structure, the floor panel 13 has an extremely high vibration distribution property. It will have the following. In addition, compared to the normal honeycomb sandwich structure, the lower plate side has a double structure of the vehicle body structure panel 3 and the adhesion auxiliary plate 12,
Its rigidity and sound insulation properties are also significantly improved. Therefore, a sufficiently wide plane can be provided, which is the floor surface of the vehicle compartment. By using a vehicle body structure panel 3 similar to a conventional floor panel, strength is ensured by the panel 3, so the upper surface plate 11 forming the honeycomb sand inch structure
Moreover, a thin and lightweight material can be used as the adhesion auxiliary plate 12, and an increase in weight can be suppressed. In particular, since the adhesion auxiliary plate 12 only needs to have the function of securing the adhesion area, it can be made extremely thin.

In the above embodiment, the car body structure panel 3 is provided with a recess 6 and the sub-honeycomb panel 9 is accommodated in the recess 6, but the car body structure panel 3 is a flat plate,
It is also possible to place a sub-honeycomb panel 9 on the upper surface thereof. However, in order to make the floor surface of the vehicle compartment completely flat and to increase the rigidity of the vehicle body structure panel 3 itself, it is desirable to configure it as in the above embodiment.

Furthermore, in the above embodiment, the Melsheet 8 is temporarily attached to the sub-honeycomb panel 9, and these units are transported to the car body assembly line. The sub-honeycomb panel 9 may be set after the Melsheet 8 is pasted on the vehicle body structure panel 3.

Furthermore, although an example in which the floor panel 13 is formed into a honeycomb sandwich structure has been described, the present invention is not limited to this, and can also be applied to cases where other vehicle body panels such as a dash board panel are formed into a honeycomb sandwich structure. .

(Effects of the Invention) As is clear from the above description, according to the present invention, an adhesion auxiliary plate is bonded to one surface of the honeycomb core, and the adhesion auxiliary plate and the vehicle body structure panel are bonded using Mel sheet. Therefore, by bonding the 82-cam core and the adhesion auxiliary plate in advance, the honeycomb core side and the vehicle body structure panel can be bonded face-to-face. Therefore, the adhesion can be made stable and reliable, and the adhesion work can also be performed on the vehicle body assembly line.

By using Melsheet for adhesion, it is possible to provide a honeycomb sandwich structure vehicle body panel with extremely high distribution performance. Moreover, since the lower plate side has a double structure consisting of the vehicle body structure panel and the adhesion auxiliary plate, the rigidity and sound insulation properties can be further improved than that of a panel with a normal honeycomb sandwich structure.

Further, according to the present invention, a sub-honeycomb panel is formed by bonding the top plate and the adhesion auxiliary plate to the honeycomb core in advance, and then the sub-honeycomb panel is bonded to the car body structural panel using Mel sheet after washing with water in the car body painting process. Because there are
The adhesion work can be performed by a conventional Mel sheet pasting process on a car body assembly line. Therefore, it is possible to obtain a honeycomb sandwich structure vehicle body panel without changing the conventional vehicle body assembly line. By assembling the sub-honeycomb panel after washing with water, the sub-honeycomb panel will not get wet with water, so not only the 82-cam core but also the top plate and adhesion auxiliary plate can be made of paper. can do. Thereby, it is possible to obtain a vehicle body panel having a honeycomb sandwich structure that is inexpensive and does not cause rust or the like.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an example of a floor panel with a honeycomb sandwich structure to which the present invention is applied, and FIG. 2 is a cross-sectional view of the floor panel. 3... Vehicle body structure panel 8... Mel seat 9
...Sub honeycomb panel 10...Honeycomb core 11...Top plate 12
... Adhesive auxiliary plate 13 ... Floor panel (vehicle body panel) Applicant Honda Motor Co., Ltd.

Claims (2)

[Claims] (1) A car body panel with a honeycomb sandwich structure, in which a top plate and an adhesion auxiliary plate are bonded to both sides of a plate-shaped honeycomb core, and the adhesion auxiliary plate is bonded to the car body structure panel via a Mel sheet. (2) A sub-honeycomb panel is formed by bonding a top plate and an adhesion auxiliary plate to both sides of a plate-shaped honeycomb core, and after washing with water in the car body painting process, the adhesion auxiliary plate is attached to the car body structural panel using Melsheet. 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 adhesion.