JPH0767750B2 - Method for integrally forming composite material structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a composite in which the standing beam preforms can be reliably joined without bending during molding and a uniform plate thickness after molding can be secured. The present invention relates to a method for integrally forming a material structure.

[Prior Art] Composite materials such as carbon composite materials (hereinafter referred to as CFRP) are materials that are occupying the mainstream of lightweight structures for aircraft.
It has various characteristics such as high specific strength and high fatigue strength and easy handling. This kind of CFRP is a wing skin,
It is used for leading edge extension, trailing edge flap, vertical stabilizer, horizontal stabilizer, vertical stabilizer, etc.

By the way, as shown in FIGS. 3 to 5, the conventional method for integrally molding the outer plate of the blade and the vertical beam by this kind of CFRP is as shown in FIG. 3 to FIG. The molded body 2 is placed, the standing beam preform 3 in an uncured state is placed on the molded body 2, and then the standing beam preform 3 is sandwiched from both sides by an elastomer block 5 such as silicon rubber, and the sealed space 6 is placed on the top. It is known that the bag film 7 is covered so as to form a vacuum and the inside of the closed space 6 is vacuumed. The elastomer block 5 has a hollow shape, a concave shape, and
Various shapes such as block shapes are used.

[Problems to be solved by the invention]

However, this type of integral molding method has a problem in that pressure is applied to the upper end of the vertical beam preform 3 during evacuation, and the vertical beam after bending is bent. Even if the elastomer block 5 forms the upper opening gap 8 above the vertical beam preform 3, this phenomenon similarly occurs because the back film 7 enters when the pressure is applied and the gap 8 is crushed.

A method of molding the elastomer block 5 by thermal expansion has also been proposed (Japanese Patent Laid-Open No. 55-41210), but due to slight differences in thermal expansion coefficient and temperature distribution, bending of the vertical beam after molding is likely to occur. However, there is a problem that the condition selection and its control are troublesome.

Therefore, an object of the present invention is to provide a method for integrally molding a composite material structure capable of ensuring a uniform plate thickness after molding without causing bending of the standing beam preform during molding. is there.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention places an uncured outer plate preform on a lower jig, and an uncured standing girder preform on the outer girder preform. By sandwiching the standing beam preform from both sides with an elastomer block higher than the body height, forming a gap of the upper opening above the standing beam preform, and closing the gap with an upper jig from above, from above A bag film is covered so as to form a closed space, and the inside of the closed space is evacuated.

[Work]

In the present invention, no pressure is applied to the gap of the upper opening when the vacuum is drawn, the resin escapes into this gap, the bending of the standing beam preform during molding does not occur, and the matching strength becomes appropriate, A uniform plate thickness can be ensured after molding.

〔Example〕

An embodiment of the method for integrally molding a composite material structure according to the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes a lower jig, and the lower jig 1
An uncured outer plate preform 2 that forms an outer plate after curing is placed on the above. The lower jig 1 is prepared as one having a desired outer surface shape of the outer plate, for example, a curved one. On the outer plate preform 2, an uncured standing beam preform 3 that forms a beam after curing is placed. Next, the elastomer block 5 formed of silicon rubber or the like having a height higher than the height of the beam preform 3 and having a concave cross section is applied so as to abut the side surface of the beam preform 3. In this way, the standing beam preform 3 and the elastomer block 5 are sequentially placed on the outer plate preform 2.

Therefore, according to the present invention, these are used as the outer plate preform 2.
At the stage of mounting on the top of the vertical girder preform 3, a gap 8 of an upper opening is formed above each standing beam preform 3, and an upper jig 10 is placed from above so as to close the gap 8. The upper jig 10 is made of, for example, steel I-shaped steel, and as shown in FIG. 2, a plurality of upper jigs 10 are fixed to the groove-shaped steel, and the groove-shaped steel is attached to the lower jig 1. It is configured to fix the position indicated by the dotted line with a bolt or the like.

Next, the heat-resistant sealant 11 is placed on the lower shoulder of the upper jig 10, and the bag film 7 is covered so as to form the closed space 6 from above, and then a vacuum pump or the like (not shown) is used. The inside of the closed space 6 is evacuated.

According to the above method, before covering the back film 7,
The elastomer block 5 forms a gap 8 of an upper opening above the vertical beam preform 3, and the gap 8 is closed by the upper jig 10. Therefore, no pressure is applied to the gap 8 when vacuuming. The bending of the standing beam preform 3 can be prevented. Further, since the bag film 7 is fixed by the upper jig 10, the pressure applied in the closed space 6 can be uniformly maintained when vacuuming, and the pressure control during molding becomes extremely easy.

〔The invention's effect〕

As is apparent from the above configuration, according to the present invention, the vertical beam preform is aligned with the outer plate preform with proper strength without bending during molding, and the composite material structure after molding is uniform. It is possible to secure a large plate thickness.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a method for integrally molding a composite material structure according to the present invention, FIG. 2 is a perspective view showing an example of a molding jig used in the same body molding method, and FIGS. FIG. 5 is an explanatory view showing a conventional method for integrally molding a composite material structure. 1 ... Lower jig, 2 ... Outer plate preform, 3 ... Vertical preform, 5 ... Elastomer block, 6 ... Sealed space, 7 ... Bag film, 8 ... Gap, 10 ... … Upper jig, 11… Heat resistant sealant.

Claims (1)

[Claims] 1. An outer plate preform in an uncured state is placed on a lower jig, and a standing beam preform in an uncured state is placed thereon.
The girder preform is sandwiched from both sides by an elastomer block higher than the height of the girder preform, and a gap of an upper opening is formed above the girder preform, and the gap is formed by an upper jig from above. A method for integrally molding a composite material structure, which comprises closing, covering with a back film so as to form a closed space from above, and evacuating the closed space.