JPH01119484A - Formation of vehicle body panel of honeycomb sandwich structure - Google Patents

Abstract

PURPOSE:To restrain minute vibration being transmitted to the inside of a vehicle from each machinery such as an engine by forming a honeycomb structure by sticking a thermoplastic sheet having adhesiveness on the surface to be joined with the surface plate of a honeycomb core. CONSTITUTION:A subhoneycomb structure 14 comprises an upper surface plate 11, a honeycomb core 12 having been joined to the undersurface of an upper plate 11, and a melsheet 13 sticked on the undersurface of the honeycomb core 12. The subhoneycomb structure 14 is set so as to be housed inside the recessed part 9 having been formed on a vehicle body panel part. The melsheet 13 melts by the heat at the time of drying in the painting process to join the honeycomb core 12 to the bottom 10 of the recessed part 9, so that the vehicle body panel can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for forming an automobile body panel, and particularly relates to a method for forming a body panel of an automobile, and particularly to a method for forming a body panel of an automobile, and in particular, a honeycomb sandwich in which a honeycomb core is sandwiched between a first face plate and a second face plate. The present invention relates to a method of forming a vehicle body panel composed of structural panels.

(Prior Art) In general, vehicle body panels such as floor panels that form the floor surface of an automobile cabin and dash panels that partition the engine room and the cabin have various properties depending on the location where the panel is installed. That is required.

For example, the floor panel, especially the portion that forms the floor surface of the vehicle interior, must be protected from deformation due to vibrations of the vehicle body while the vehicle is running. In addition, the floor panel is required to play a major role in suppressing minute vibrations from various devices such as the engine and blocking noise transmitted into the vehicle interior.

Generally, a floor panel is often formed of a vehicle body panel portion that is press-molded using two flat plates integrally with a center tunnel member that constitutes a center tunnel extending in the longitudinal direction of the vehicle body. In that case, if such a vehicle body panel portion is simply made flat, the floor panel has a relatively large area, so the rigidity of the floor panel is reduced and the floor panel is easily deformed.

Therefore, it is usual to form uneven parts on the floor panel,
Rigidity is increased by attaching reinforcing members such as cross members.

In addition, such floor panels are not only unable to attenuate minute vibrations transmitted from the engine, etc., but also cannot block noise such as running noise, so the floor panels are not equipped with Melsheet, which is a damping material, or sound insulating material. An insulator is installed to dampen minute vibrations and prevent noise from being transmitted into the cabin.

However, the floor panel is required to be as flat as possible, but if uneven portions are formed, a flat surface cannot be obtained. Furthermore, if the reinforcing material, Mel sheet, and insulator are attached to the floor panel, the weight becomes extremely large.

For this reason, as shown in Japanese Utility Model Application Publication No. 57-133479, the floor panel is made of a honeycomb structure in which a honeycomb core is sandwiched between a first face plate and a second face plate, that is, a lower face plate and an upper face plate. A sandwich structure is proposed.

Such a sandwich-structured floor panel is lightweight, extremely rigid, and has excellent sound insulation. Therefore, by using such a floor panel, it is possible to increase the flat area of the floor of the vehicle compartment. However, since such a honeycomb panel has extremely high rigidity, when forming a honeycomb sandwich structure such as a floor panel, for example, it is impossible to integrally mold it with a vehicle body strength member such as a center tunnel. Therefore, the honeycomb structure floor panel must be formed as a single piece and be coupled to the vehicle body strength member. To achieve this, it is necessary to significantly change the conventional vehicle body assembly line in which the floor panel is formed by a vehicle body panel portion that is press-molded integrally with the center tunnel member.

For this reason, it is possible to make the floor panel into a sandwich structure by press-forming the bottom plate of the honeycomb panel integrally with the center tunnel member and joining the honeycomb core and top plate on top of the bottom plate. It is being

With this configuration, a conventional vehicle body panel portion integrated with the center tunnel member can be used as the lower surface plate. Therefore, when assembling a floor panel with a honeycomb sandwich structure, the conventional assembly line can be used as is without much modification.

(Problems to be Solved by the Invention) By the way, when forming a car body floor section with such a sandwich-structured floor panel, generally the bottom plate and the center tunnel member are press-formed together on the car body assembly line. After that, it is considered that the honeycomb core and the top plate should be bonded to the bottom plate in order immediately using an adhesive.

However, if this is done, the white body on which the honeycomb-structured floor panel is formed will be transported to the painting line. Then, in the painting process, the body is washed with water, so the washing water enters the honeycomb core and wets the core. Since the honeycomb core is made of paper or the like, it deteriorates when it gets wet with water. In addition, rust may occur on the inner surfaces of the top and bottom plates due to infiltrated water. For this reason, it is necessary to securely seal between the upper and lower plates, which results in a time-consuming assembly process.

Additionally, it is necessary to add a new bonding process to the car body assembly line. Therefore, new equipment must be introduced,
Not only does this require significant equipment costs, but it also requires time for the adhesive to harden, so it is necessary to coordinate this time with other processes on the assembly line.

As described above, it is difficult to join the honeycomb core and the upper plate to the lower plate immediately after the center tunnel member and the lower plate are integrally press-molded.

The present invention has been made in view of these problems, and its purpose is to make it possible to form a car body panel with a honeycomb sandwich structure without significantly changing the conventional car body assembly line. That's true.

Another object of the present invention is to provide a vehicle body panel that can easily seal between the first and second face plates.

(Means for solving the problem) In order to achieve this object, in the present invention, a first face plate constituting a vehicle body panel having a honeycomb sandwich structure is formed by a body panel portion coupled to a vehicle body strength member, In addition, by bonding the second face plate and one end of the honeycomb core in advance and pasting an adhesive thermoplastic sheet to the other end of the honeycomb core, that is, the joint end with the first face plate, a sub-honeycomb structure can be created. We are trying to form a

After washing with water in the painting process is completed, the sub-honeycomb structure is set on the first face plate.

(Function) With this configuration, the first face plate constituting the vehicle body panel with the honeycomb sandwich structure can be formed in the same process as the conventional assembly line in which the body panel portion that is coupled to the vehicle body strength member is press-formed. Become so.

In addition, when joining the sub-honeycomb structure to the first face plate,
All that is required is to attach the thermoplastic sheet of the structure to the first face plate. Therefore, such a thermoplastic sheet can be attached to the first face plate in the same process as the conventional Mel sheet attaching process. As a result, there is no need to make major changes to the conventional car body assembly line.

Furthermore, since the first face plate of the sub-honeycomb structure is not joined, it is extremely easy to deform. In other words, since the sub-honeycomb structure has flexibility, even if the first face plate is distorted due to twisting or the like, the sub-honeycomb structure can adapt to and follow the shape of the first face plate. It becomes like this. Therefore, the honeycomb core and the first face plate are uniformly and reliably joined.

Furthermore, since the sub-honeycomb structure is set on the first face plate after washing with water in the coating process is completed, there is no possibility that washing water will enter into the honeycomb core. Therefore, a simple seal between the first and second face plates is sufficient.

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

The figure explains one embodiment of the method for forming a car body panel with a honeycomb sandwich structure according to the present invention using an example in which the car body panel is applied to a floor panel. FIG. 2 is an exploded perspective view shown together with FIG.

As is clear from FIG. 1.2, a pair of side sills 1.degree. 1 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 floor surface of the passenger compartment. The side sill 1 consists of a side sill outer member 2 and a side sill inner member 3, and has a hollow closed cross section.

Furthermore, a pair of center frames 4.4 extending in the front-rear direction are provided approximately midway between the left and right side sills 1.1. The center frame 4 has a channel shape that is open upward.

Further, a channel-shaped center tunnel member 5 formed at the center and open downward, and a body panel portion 6 extending from the member 5 to the left and right side sills 1.1 are pressed together using two flat plates. Molded. and,
A center tunnel member 5 is connected to a pair of center frames 4, 4
A center tunnel 7 having a hollow closed cross-section reinforcing portion is formed by connecting these parts to each other. Further, a flange 8 is provided at the end of the vehicle body panel portion 6 opposite to the center tunnel 7, and the flange 8 is connected to the side wall 3 of the side sill inner member 3.
It is joined to a. In this way, the vehicle body panel portion 6 is attached to the side sill 1 and the center tunnel 7, which are vehicle body strength members.
are now combined.

A recess 9 having a predetermined shape is formed in the vehicle body panel portion 6, and the bottom 10 of the recess 9 is flat.

On the other hand, the top plate 11 is formed of a single flat plate that is thinner than the vehicle body panel portion 6.

Then, a honeycomb core 12 made of paper or the like is bonded to the bottom surface of the top plate 11, leaving only the outer peripheral edge thereof, and a Melsheet 13, which is a thermoplastic sheet with adhesive properties, is attached to the bottom end of the honeycomb core 12. By doing so, a sub-honeycomb structure 14 is formed. Since this structure 14 only has the top plate 11 joined to one side of the honeycomb core 12, it can be bent relatively easily. That is, the structure 14 has flexibility. Further, the top plate 11 is sized to completely cover the recess 9 and overlap with the peripheral edge of the recess 9 of the vehicle body panel portion 6 . Furthermore, the honeycomb core 12 is sized to be completely accommodated within the recess 9 thereof.

Such a sub-honeycomb structure 14 is shown in FIG. 2 after washing with water in the painting process of a white body on which side sills 1, body panel parts 6, center tunnel 7, etc. are assembled on a car body assembly line. like,
With the honeycomb core 12 housed in the recess 9,
It is set in the vehicle body panel portion 6. In this state, the outer peripheral end portion of the top plate 11 is joined to the vehicle body panel portion 6 via a sealing material such as seek.

Then, the melt sheet 13 is melted by the drying heat of the coating process or its residual heat, and the honeycomb core 12 and the bottom 10 of the recess 9 are joined. In that case, if the honeycomb core 12 is made of paper, the melted Melsheet 13 will penetrate into the core 12. Therefore, the bonding force between the core 12 and the bottom 10 is increased. That is, Melsheet 13 functions as an adhesive.

Since the core 12 and the vehicle body panel portion 6 are firmly joined by the Mel sheet 13, the upper surface plate 1
1 and the vehicle body panel portion 6 may be joined by a relatively simple method.

In this way, between the side sill 1 and the center tunnel 7,
A floor panel 15 having a honeycomb sandwich structure is formed integrally with the center tunnel 7. In that case, the vehicle body panel portion 6 formed integrally with the center tunnel member 5 constitutes a lower surface plate 16.

The lower plate 16 and the upper plate 11 are the first plate of the present invention.
It constitutes a face plate and a second face plate.

In the floor panel 15 configured in this manner, the lower surface plate 16 and the center tunnel member 5 are integrally press-molded from a single flat plate, but such integral molding is similar to a conventional vehicle body assembly line. It can be molded in the same process. In addition, the sub honeycomb structure 14 is attached to the bottom plate 1.
6, it is only necessary to attach the Melsheet 13 to the bottom plate 16, so it can be performed in the same process as the conventional Melsheet attaching process. Therefore, an adhesive application step is not necessary. Moreover, after washing with water in the painting process is completed, the sub-honeycomb structure 14 is set from above the vehicle body panel portion 6, that is, from the negative side, and is joined to the bottom plate 16 at the outer peripheral end of the top plate 11, and in this state, the painting process is carried out. By simply melting Melsheet 13 using the heat during drying,
A floor panel 15 having a honeycomb structure can be easily formed. If this is done, the honeycomb core 12 will not come into contact with the cleaning water, so there is no need to make the seal between the top plate 11 and the bottom plate 16 particularly strict. Therefore, the waterproofing of the honeycomb core 12 becomes easy, and the manufacture of the floor panel 15 becomes even easier. Furthermore, not only does it not require any new equipment and can be used on a conventional car body assembly line with almost no changes, Melsheet 13 is cheaper than other adhesives. The floor panel 15 can be manufactured at relatively low cost.

Furthermore, since a recess 9 is formed in the vehicle body panel portion 6,
The rigidity is large due to the shape effect. Therefore, the car body panel part 6 does not bend, and the installation work of the integral press molded product of the car body panel part 6 and the center tunnel member 5 on a jig etc. before the sub-honeycomb structure 14 is attached can be done accurately. It can be done easily.

Moreover, the honeycomb core 12 of the structure 14 is located within the recess 9.
simply by accommodating the structure 14 into the vehicle body panel portion 6
You will be able to set it to . Therefore, there is no need to take any special measures for positioning the structure 14 with respect to the vehicle body panel portion 6.

Furthermore, since the sub-honeycomb structure 14 is flexible, even if the vehicle body panel portion 6 is distorted due to twisting or the like, the structure 14 will remain in the vehicle body panel portion 6.
You will be able to adapt and follow the shape of. Therefore, the honeycomb core 12 and the bottom 10 of the recess 9 are joined almost uniformly and reliably over the entire surface thereof. In that case, since Melsheet 13 is used as the adhesive, distortions in the vehicle body panel portion 6 can be absorbed more efficiently.

In addition, in the floor panel 15 having such a honeycomb sandwich structure, the bottom plate 16 and the honeycomb core 12 are joined by the Mel sheet 13, and since the Mel sheet 13 has a vibration damping function to damp minute vibrations. The floor panel 15 can effectively absorb minute vibrations from various devices such as the engine.

Furthermore, since the top plate 11 of the structure 14 is formed of a single flat plate, a large plane is formed on the floor surface of the vehicle interior, making the living space in the vehicle interior more efficient.

In the above embodiment, Melsheet 13 is used as the adhesive thermoplastic sheet, but other adhesive thermoplastic sheets such as other resin sheets can also be used.

Further, in the above embodiment, the honeycomb sandwich structure vehicle body panel is applied to the floor panel 15, but it is possible to prevent vibrations, noise, and heat from the engine room from being transmitted into the vehicle interior. The method for forming a honeycomb sandwich structure vehicle body panel according to the present invention can be applied to other vehicle body panels that require functions such as distribution, sound insulation, and heat insulation, as well as dash panels.

(Effects of the Invention) As is clear from the above description, according to the present invention, the vehicle body panel portion connected to the vehicle body strength member is formed into a honeycomb structure in which a honeycomb core is sandwiched between the first face plate and the second face plate. Since it is configured as the first face plate in a sandwich structure, the first face plate can be formed in the same process as the conventional car body assembly line that press-forms the car body panel part that is connected to the car body strength member. become. Moreover, a sub-honeycomb structure is formed by joining the second face plate and the honeycomb core and pasting a thermoplastic sheet to the core in advance, and when joining the structure to the first face plate, the thermoplastic sheet By pasting on the first face plate,
Since the sub-honeycomb structure is bonded to the first face plate, the bonding can be performed in the same process as the conventional Mel sheet bonding process. therefore,
This eliminates the need to make major changes to the conventional body assembly line, and there is no need to introduce new equipment. As a result, it becomes possible to form a honeycomb sandwich structure vehicle body panel at extremely low cost.

In addition, when the car body panel has a honeycomb sandwich structure, it is sufficient to simply set the sub-honeycomb structure on the first face plate from one side, but in that case, since the structure has flexibility, , it becomes possible to follow the surface shape of the first face plate. Therefore, the honeycomb core,
It becomes possible to join to the first face plate easily and reliably.

Furthermore, since the sub-honeycomb structure is set on the first face plate after washing with water in the painting process, the honeycomb core will not get wet with washing water. There is no need for strict sealing, and waterproofing can be done extremely easily.

[Brief explanation of the drawing]

FIG. 1 explains one embodiment of the method for forming a car body panel with a honeycomb sandwich structure according to the present invention using an example in which the car body panel is applied to a floor panel, and the floor panel is shown together with the car body floor part. Exploded perspective view. FIG. 2 is a vertical sectional view of the vehicle floor portion in the left-right direction of the vehicle body. 6... Vehicle body panel portion 11... Upper surface plate (second surface plate) 12... Honeycomb core 13... Mel sheet (thermoplastic sheet) 14... Sub-honeycomb structure 16... Lower surface plate (second surface plate) 1 side board)

Claims (1)

[Scope of Claims] A method for forming a vehicle body panel having a honeycomb sandwich structure in which a honeycomb core is sandwiched between a first face plate and a second face plate; A sub-honeycomb structure is formed by joining the second face plate and the honeycomb core, and attaching an adhesive thermoplastic sheet to the joint surface of the honeycomb core with the first face plate. A method for forming a vehicle body panel having a honeycomb sandwich structure, comprising: forming the sub-honeycomb structure, and setting the sub-honeycomb structure on the first face plate after washing with water in a painting process.