JPS6210586B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for bagging and adhering structures using pressurization using a pressure vessel (autoclave) or depressurization using a vacuum device.

Conventional bagging bonding method for structures using sheet-shaped plastic film as a pressure medium (bagging material) For example, bagging bonding method for complex-shaped structures such as the aircraft skin structure shown in Figure 1 (Figure 2) However, it has the following drawbacks.

(1) For example, when bonding a structure with a complex shape such as a three-dimensional intersection between parts, the film may stretch, causing so-called bridging, resulting in insufficient bonding pressure, or the film may tear and bond when pressurized by an autoclave. Adhesion will be insufficient due to insufficient pressure. Here, bridging is a phenomenon in which a gap is created between the plastic film and the pressurized surface of the structure, making it impossible to apply pressure uniformly. This is a phenomenon in which a displacement that exceeds the elongation at break of the plastic film occurs, and is the biggest cause of film breakage. becomes.

(2) In bonding the complex-shaped structure shown in FIG. 1, in order to avoid the insufficient bonding pressure in (1), the first step is to bond the outer panel 01, the doubler 02, and the stringer 04, and then Rib 03 on this adhesive structure
This requires separate adhesion and a second step of gluing, which increases production costs.

(3) Even in the case of (2) above, it is necessary to use an intermediate pressure medium 010 as shown in the cross-sectional view of bagging bonding using an intermediate pressure medium in FIG. 3 in order to prevent bridging of the plastic film. For gluing,
Heating at 120 to 180° C. is required to cure the adhesive, but if intermediate pressure medium 010 is used, workability is poor and the thermal energy required to heat the intermediate pressure medium itself is wasted.

(4) The plastic film 06 and vacuum sealant 08 shown in FIG. 2 are disposable, and the consumption of such adhesion molding auxiliary materials increases production costs.

It is an object of the present invention to provide a method for bagging and bonding structures using a new pressure medium that eliminates the above-mentioned drawbacks, namely, insufficient pressure, increased number of steps, prolonged working time, loss of thermal energy, and decreased workability. That is.

That is, the present invention covers the structure to be bonded with a bagging material, reduces the pressure in the space created by the inner surface of the bagging material containing the structure, and/or pressurizes the outer surface of the bagging material to bond the structure. A structure characterized in that, in a bucking bonding method for a structure to be bonded, a pressure bag whose inner surface shape is formed to match the shape of the pressure surface of the structure is used as a bagging material by being adhered to the pressure surface of the structure. The gist of this paper is the bagging adhesive method.

Generally, it is common to apply pressure to the space above the bagging material to bond the structure while reducing the pressure in the space where the structure is located on the bottom surface of the bagging material. can get.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 4 is an enlarged perspective view of the reinforced aircraft skin 11 immediately before bonding to explain an embodiment of the present invention.

The outer panel 1 is fixed on the adhesive jig 7, the doubler 2 is placed on the outer panel 1 with an adhesive 5 in between, and the ribs 3 and stringers 4 are placed on the doubler 2 with the adhesive 5 in between. Assembly is fixed. At this time, if the parts are fixed with heat-resistant tape, no misalignment will occur. Further, on this reinforced outer panel 11, an elastomer pressure bag 6 processed to match the shape of the pressure surface of the reinforced outer panel 11 shown in FIG. 5 is attached. Fifth
FIG. 6 is an enlarged perspective view of the reinforcing skin 11 covered with the elastomer pressure bag 6 shown in FIG.

The elastomer pressure bag 6 shown in FIG. 6 is partially omitted in the illustration, and actually covers the entire reinforcing outer panel 11. FIG. 7 is a sectional view of the reinforcing outer panel 11 shown in FIG. 6, and an elastomer pressure bag 6 is pressed into the round groove in the bonding jig 7 with a seal rubber 8 to make it airtight. Finally, a vacuum is drawn from the vacuum mouthpiece 9 and the pieces are bonded while being heated and pressurized.

By using an elastomer manufactured according to the shape of the parts to be bonded as a pressure bag instead of a plastic film, the following effects can be obtained.

Elastomer pressure bags are made to match the shape of the pressurized surface of the parts to be bonded, and because they are flexible, they are comparable to film bridging and film tearing that occur when using conventional sheet-shaped plastic films. There is no problem of insufficient pressure during bonding. In other words, they are bonded while being uniformly pressurized.

Since there is no problem of insufficient pressure, there is no need to perform the bonding work in several steps, and the bonded parts can be adhesively cured and assembled in a single autoclave operation.

Since there is no problem of insufficient pressure such as non-uniformity of the bonding member, no intermediate pressure medium is required. Therefore, thermal energy loss during heating for adhesive curing can be minimized and working time can be shortened.

If the elastomer pressure bag is made of an elastomer mainly composed of silicone rubber or fluorine rubber, it will have excellent heat resistance and flexibility, and the elastomer can be repaired using the same material, so it can be reused. Economical. Also in this case,
The elastomer can be applied to the pressurized surface of the structure with a spray gun, and the work is easy because it has good releasability.

As described above, stable and high adhesive quality can be obtained at low cost.

FIG. 8 is a perspective view of a pressure bag 26 made of plastic film having a shape matching the shape of the pressure surface of the adhesive structure used in the second embodiment of the present invention. Even if this is used as a pressure bag in place of the elastomer pressure bag shown in FIG. 5 of the first embodiment, there is no gap between the plastic film and the pressure surface of the structure, so there is insufficient pressure due to bridging. does not occur. Furthermore, there is almost no change in the shape of the film when no pressure is applied and when pressure is applied, and therefore, the distortion is small, so that the film does not tear. Therefore,
Bonding and assembly can also be done in one step, which has the advantage of minimizing thermal energy loss during bonding heating.

As mentioned above, when the bonding method of the present invention is used, tearing of the pressure bag and bridging are less likely to occur, so there is no problem of insufficient pressure during bonding, and therefore structures with complex shapes can be bonded in one step. Done,
Furthermore, since no intermediate pressure medium is used, there is an advantage that thermal energy loss during bonding heating can be minimized and a highly accurate structure can be manufactured in a short time.

[Brief explanation of the drawing]

Figure 1 is an enlarged perspective view of the aircraft skin structure;
The figure is a schematic cross-sectional view showing a conventional pressure bonding method using a plastic film as a pressure medium, and FIG. 3 is a schematic cross-sectional view showing a conventional bonding method using an intermediate pressure medium and a plastic film. FIG. 4 is an enlarged perspective view of an aircraft reinforced skin before bonding as an example of applying the method of the present invention, and FIG. 5 is an enlarged needle view of an aircraft reinforced skin according to the first embodiment of the present invention. FIG. 6 is a partial perspective view of an elastomer pressure bag shaped to match the shape of the pressure surface, FIG. FIG. 7 is a sectional view of a reinforced skin of an aircraft covered with an elastomer pressure bag according to a first embodiment of the present invention, and FIG. 8 is a cross-sectional view of a reinforced skin of an aircraft used in a second embodiment of the present invention. FIG. 2 is a perspective view of a plastic sheet bladder shaped to match the shape of the pressure surface. 1... Outer panel, 2... Doubler, 3... Rib, 4... Stringer, 5... Adhesive, 06... Plastic sheet,
6... Elastomer pressure bag shaped like the pressure surface of the adhesive body, 26... Plastic sheet pressure bag shaped like the pressure surface of the adhesive body, 7... Adhesive jig, 8... Seal rubber, 9... Vacuum mouthpiece, 010... Intermediate pressure medium, 1
1...Reinforced outer panel structure.

Claims (1)

[Claims] 1 Cover the structure to be bonded with a bagging material, reduce the pressure in the space created by the inner surface of the bagging material including the structure, and/or pressurize the outer surface of the bagging material to bond the structure. 1. A method for bagging and bonding a structure, characterized in that a pressure bag whose inner surface shape is formed to match the shape of the pressure surface of the structure is used as a bagging material by being adhered to the pressure surface of the structure.