JPH0142870B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a body structure panel for constructing a vehicle body with good sound insulation and sound absorption efficiency, and a method for molding the same.

In recent years, the weight of vehicle body structures has been reduced from the standpoint of energy conservation, and body structural steel plates have been made thinner. However, this has resulted in a decrease in the strength of the vehicle body, a lack of safety, and The reality is that a large amount of technology and money is wasted on measures to insulate and absorb sound from the outside, resulting in inconvenient results.

In view of the above-mentioned circumstances, the present invention provides a vehicle body structure that has good sound insulation and sound absorption effects without hindering the weight reduction of the vehicle body, and is also highly rigid to compensate for the lack of strength of the vehicle body structural steel plate. The purpose is to provide a panel and its molding method, especially the first
It is an object of the present invention to provide a panel suitably used as a dart lower DL forming a partition wall with the engine room shown in the figure.

As shown in the illustrated embodiment, the vehicle body structure panel according to the present invention is a composite of a vehicle body structure steel plate 1 and a synthetic resin layer 2 laminated on the vehicle body structure steel plate 1 by compression molding of molten synthetic resin. In the plate A, the synthetic resin layer 2 and the vehicle body structural steel plate 1 are connected to a large number of coupling protrusions or coupling ribs 3 protruding from the vehicle body structural steel plate 1, and the coupling protrusions or coupling ribs 3 are bored. It has an integral structure with a bonding resin layer 2' formed by press-fitting a synthetic resin into the girder communication hole 4 or groove 5. Therefore, a composite plate A is constructed in which one side is a synthetic resin layer side and the other side is a vehicle body structural steel plate side.

The vehicle body structure panel described above is molded in the following steps. That is, the vehicle body structural steel plate 1 is
At the same time as mounting holes for steering columns, accelerators, brakes, etc. and electrical wiring insertion holes are punched, they are press-formed into a shape suitable for the body components, and at the same time, communicating holes 4 or 4 are formed on the surface of the vehicle body structural steel plate 1. A number of coupling protrusions or coupling ribs 3 with grooves 5 are pressed. Next, lower mold 6
The molten synthetic resin 7 is charged onto the surface of the vehicle body structural steel plate supported by the upper die 8 of the resin press molding machine.
is lowered to apply compression to the molten synthetic resin 7. Through this compression, a part of the molten synthetic resin is press-fitted into the recess or groove 3a formed on the back surface of the coupling protrusion or coupling rib 3 through the communication hole 4 or groove 5, and is melted onto the surface of the vehicle body structural steel plate 1. A synthetic resin layer 2 is formed, and the molten synthetic resin layer 2 and the vehicle body structural steel plate 1 are integrated.

The upper die 8 is provided with punching holes 9 corresponding to the mounting holes and insertion holes of the steering column, brake, accelerator, etc., drilled in the vehicle body structural steel plate 1. Make sure that the insertion hole is not blocked by molten synthetic resin. Further, as an example, the vehicle body structure panel has a welding margin 10 remaining at its edge with another body structure panel,
This makes it convenient for welding body assembly.

As a specific example, an elastic material 12 such as urethane rubber is protruded from the end of the upper mold 8 corresponding to the welding margin 10, and the mold is clamped while the elastic material 12 is brought into contact with the welding margin 10 and crimped. 12 to the welding margin 10 and expanding laterally, the welding margin 1
It was designed to reliably block the flow of molten resin into the 0 and expose the sound metal surface.

In addition, the synthetic resin layer 2 of the vehicle body structure panel contains glass fiber and various fillers to improve strength and impart flame retardancy, as well as to improve effects such as noise insulation.

Further, FIG. 5 shows that after integrally molding the molten synthetic resin 7 and the vehicle body structural steel plate 1, and before the molten synthetic resin layer hardens, a sound absorbing material 11 is attached to the surface of the molten synthetic resin layer 2 using its adhesive property. This shows a case in which a panel with sound absorbing properties is constructed by bonding under pressure. In this way, it is possible to eliminate the need for adhesive and to omit the subsequent process of lining the sound absorbing material.

Further, as shown in FIG. 6, when integrally molding the molten synthetic resin 7 and the vehicle body structural steel plate 1, the tops of the coupling protrusions or coupling ribs 3 protruding from the surface of the vehicle body structural steel plate 1 are placed in the upper die 8. by squishing, etc.
If a part of it is exposed on the surface of the synthetic resin layer 2 to form a vehicle body structure panel, other necessary parts can be welded and fixed using the exposed surface of the vehicle body structure steel plate, or as another example. Above upper mold 8
A mounting hole 14 is formed in the resin in the recess 3a by pushing the protrusion 13 into the communication hole 4 bored at an arbitrary location on the top of the coupling rib 3, and then inserting the tapping screw 1 into the hole 14.
5 is screwed in to attach the parts. In this case, it is preferable to leave the thin resin part 16 at the bottom of the mounting hole 14, and pierce only the required mounting hole portion with the screw 15. In addition, a low-cost polyolefin resin that does not have an adhesive function can be used as the synthetic resin material, and the exposed surface can be used to bond or weld interior components, etc., especially on the surface of the synthetic resin layer 2. This is convenient when attaching other sound absorbing materials, boards, etc. Further, as an example, FIG. 8 shows a panel in which a sound absorbing material 11 such as felt is laminated on the surface of a synthetic resin layer 2 with staples 17.

Therefore, the present invention provides a rigid structure with high vibration resistance, in which a synthetic resin layer and a vehicle body structural steel plate are integrated by press-fitting the resin into communication holes or grooves formed in a large number of coupling protrusions or coupling ribs. To provide a vehicle body structure panel with excellent sound insulation and sound absorption effects, and to easily and conveniently construct a highly safe vehicle body. Furthermore, it is possible to appropriately omit laying and pasting of Melsheet, glass wool, felt, hardboard, etc. during the interior of the vehicle body as in the conventional art. Also,
Due to the demand for lighter vehicle body structures, there is a trend toward thinner body structural steel plates. It is possible to provide a highly rigid vehicle body structure panel that compensates for the lack of strength, and a method for forming the same.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view showing the lower part of the vehicle body; FIG. 2 is an enlarged cross-sectional view showing an embodiment of the vehicle body structural panel according to the present invention; and FIG. 3 is an example of the vehicle body structural steel plate. A perspective view showing an example,
FIGS. 4A and 4B are cross-sectional views for explaining the principle of the method of forming the vehicle body structure panel according to the present invention, and FIGS. 5 to 7 show other examples of the vehicle body structure panel according to the present invention. It is an enlarged sectional view. DESCRIPTION OF SYMBOLS 1... Vehicle body structural steel plate, 2... Synthetic resin layer, 3... Connection protrusion or connection rib, 4... Communication hole, 5... Communication groove, A... Composite plate.

Claims (1)

[Scope of Claims] 1. A composite plate of a vehicle body structural steel plate and a synthetic resin layer, wherein the synthetic resin layer and the vehicle body structural steel plate are composed of a large number of coupling protrusions or coupling ribs protruding from the vehicle body structural steel plate. and press-fit synthetic resin into communication holes or grooves drilled in the coupling protrusion or coupling rib to form an integral structure, one side of which is a synthetic resin layer surface and the other surface of which is a vehicle body structural steel plate surface. A vehicle body structure panel. 2. The vehicle body structure panel according to claim 1, wherein the synthetic resin layer contains various fillers. 3. The vehicle body structure panel according to claim 1, wherein a part of the coupling protrusion or coupling rib is exposed on the surface of the synthetic resin layer. 4 At the same time as press forming of the vehicle body structural steel plate,
A large number of coupling protrusions or coupling ribs with communicating holes or grooves are press-molded on the surface of the vehicle body structural steel plate, and after charging the molten synthetic resin on the surface of the press-formed vehicle body structural steel plate, compression is applied. Press the molten synthetic resin into the recess or groove formed on the back surface of the coupling protrusion or coupling rib through the communication hole or groove, and form the molten synthetic resin layer on the surface of the vehicle body structural steel plate, and form the vehicle body structural steel plate. A method of forming a vehicle body structure panel in which one side is a synthetic resin layer surface and the other side is a vehicle body structural steel plate surface, which is formed by integrating a and a synthetic resin layer.