JPS58179637A - Light hollow body for high load - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a composite material (e.g., carbon fiber and evokino prepreg) capable of withstanding high bending and compressive loads.
Concerning lightweight hollow bodies made of

Such hollow bodies are used, for example, in the satellite separation part that connects the third-stage rocket motor and the satellite in satellite launch vehicles, but even if the payload of the rocket is the same, it is possible to launch a heavier satellite. In order to achieve this, it is necessary to reduce the weight of the ring hollow body as much as possible while maintaining sufficient strength.By the way, the composite hollow body is made entirely of metal (for example, aluminum alloy). However, there is a problem in that when a composite skin is connected with a metal frame, it becomes heavier than when it is made entirely of composite materials, and even if the hollow body is made entirely of composite materials, its walls If it is formed into a corrugated shape, there is a problem in that it is difficult to process the ends when joining them to other parts.

Furthermore, when reinforcing stringers are added to the wall of a hollow body made entirely of composite material by secondary adhesion, there are also problems in that the shear strength is insufficient and the weight of the adhesive increases.

An object of the present invention is to solve the above-mentioned problems and provide a lightweight hollow body for heavy loads that is lightweight while providing sufficient strength.

Therefore, the lightweight hollow body for heavy loads of the present invention has a cylindrical body,
A reinforcing stringer is integrally formed on the side wall thereof, and an annular member is bonded along the circumferential surface of the end of the cylindrical body, and unidirectional materials are laminated only in the circumferential direction of the annular member. It is characterized by being molded.

Hereinafter, a high-load lightweight hollow body as an embodiment of the present invention will be explained with reference to the drawings. FIG. 1 is a perspective view thereof, and FIG.
The figure is a sectional view taken along the line ■--■ in FIG. 1, and FIG. 3 is a diagram showing the manufacturing process.

As shown in FIG. 1.2, the cylindrical body 1 made of reinforced plastic as a composite laminate 4A has an upper flange 2 and a lower flange 73 at its ends, and also has an upper flange 2 and a lower flange 73. On the inner wall, a large number of reinforcing stringers 4 made of the same composite laminated material as this clay are integrally molded and arranged in a row.

Further, on the upper flange 2 of this cylindrical body 1, an annular portion 5 formed by laminating unidirectional carbon fibers such as carbon fibers only in the circumferential direction by the filament winding method is attached to the upper flange 2 using a room-temperature adhesive. It is being

Next, the manufacturing process of the high-load, lightweight hollow body of the present invention will be explained with reference to FIG.

(Step 2 1) Since the stringer mold will be removed after step 7 is completed, use Teflon, which has good mold releasability. '81: The mandrel 1 and/or cylinder are made of metal.

(Step 2) In order to improve the mold release of the mandrel and flange from the carbon F'RP tonnage, the mandrel and cylinder are coated with silicone, and the silicone coating and baking process is performed.

(Step 3) Evogishi prepreg is laminated on the mold and flange prepared in Step 1, and the resin is sucked off to form a stringer and a cylindrical body.

In particular, the flange portion of the cylindrical body has a large number of laminated sheets (the total number of laminated sheets is 110p1y) and it is difficult to suck up the resin at once, so the resin is sucked off in two parts.

Generally, 180°C hardening type Evokin II fatoke 12
0'CX about 30 minutes is enough. This resin suction is performed to reduce the molded product size (nearly 9 mm in thickness) before assembling each laminate for final curing. ).

This resin blotting has the following advantages.

(1) Matching during assembly becomes easier.

(2) Dimensional accuracy after curing is improved by -1.

(3) No need for a bleeder cloth during curing.

As for the annular member, the filament winding method is used, so the resin is not absorbed.

In the explanatory diagram of the banoguiing for the cylindrical body in process knee 3, the symbol a indicates the flange wall, and b, c and d are the banoguiing materials such as buckyme film (nylon) and bleeder cloth (glass cloth), respectively.
and pill ply (indicates nylon cloth 9, e indicates prepreg, f indicates seal).

(Step 4) Regarding the flange portion of the cylindrical body, first lamination is performed, resin is sucked off, and then second lamination is performed.

The second resin blotting can be done during curing in step 6, so the resin blotting here is not necessary.

(Step 5) Assemble the stringer to the main body. Banogiing is done in the same way as step 3. However, blotting the resin is step 4.
Only the second laminated part.

(Step 6) Curing (180°C for 2 hours + 90 psi as an example)
The temperature and time are adjusted to the curing characteristics of the prepreg resin for 7 hours (180'C x 2 hours as an example).The zero pressure is 35-7 kg/'cm using an autoclave etc.
By applying 2 gauge pressure, a molded product with high fiber content and few voids can be obtained. (Step 7) Remove the stringer mold.

(Step 8) Process the annular part formed by the filament winding method 7 and the flange part of the cylindrical body.

(Step 9) Affinity of prepreg with resin (Af f 1nity
)) Glue the annular member along the circumference of the end of the cylindrical body using a room-temperature adhesive with a good temperature.

Note that the cross-sectional shape of the cylindrical body may be circular, square, or any other suitable hollow shape.

The hollow body of the present invention manufactured in this way has a semi-monocoque structure made of composite materials, and is lightweight and has high strength.Especially at the end of the cylindrical body, the filament winding method is used. By laminating unidirectional materials only in the circumferential direction and bonding the formed annular member, high strength and rigidity can be obtained while reducing weight.

[Brief explanation of the drawing]

Figures 1 and 2 show a lightweight hollow body for heavy loads as an embodiment of the present invention. Figure 1 is a perspective view thereof, and Figure 2 is a
The sectional view taken along the line II--II in the figure, and Figure 3, are the manufacturing process diagrams. l...Cylindrical main body, 2...Upper flange, 3...Lower flange, 4...Si ringer, 5...Annular member. Minor Agent Yoshihiko Iinuma, Patent Attorney Continued from page 1 [Partner] Inventor Yoshiaki Sakatani, Mitsubishi Heavy Industries, Ltd., Nagoya Aircraft Works, 10 Oe-cho, Minato-ku, Nagoya Inventor: Tetsuya Yamamoto 10 Oe-cho, Minato-ku, Nagoya Address Mitsubishi Heavy Industries, Ltd., Nagoya Aircraft Works. Author: Yoshio Ono. 10 Oe-cho, Minato-ku, Nagoya. Mitsubishi Heavy Industries, Ltd. Nagoya Aircraft Works. Author: Mutsuo Inaguma. 10 Oe-cho, Minato-ku, Nagoya. Author: Mitsubishi Heavy Industries, Ltd. Nagoya. Inside the aircraft manufacturing facility ■Applicant: Mitsubishi Heavy Industries, Ltd. 2-5-1-217 Marunouchi, Chiyoda-ku, Tokyo

Claims (1)

[Claims] It comprises a cylindrical body, a reinforcing stringer integrally formed on the side wall thereof, and an annular member glued along the peripheral surface of the end of the cylindrical body, -
] - A lightweight hollow body for heavy loads, characterized in that the annular portion is formed by laminating unidirectional materials only in the circumferential direction.