RU2356789C1 - Method for formation of power rib on shell of composite materials - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention is related to machine building and may be used in aircraft building and other engineering fields in manufacture of shells from composite materials, on which units, pipelines and actuating elements of control system are installed. Method for formation of power rib on shell from composite materials includes winding of cords or tapes impregnated with binder in place of rib location to get required height of rib with further thermal treatment of produced packet and openings in it. In place of rib location annular supports are installed at the distance from each other equal to rib width and with height of not below height of formed rib. Between annular supports cords or tapes are wound till they reach border of openings location. Pins are installed in annular supports with diametre equal to diametre of openings, between pins cloth segments are laid with thickness equal to diametre of openings. Rib is wound to get required height, and after achievement of specified height and thermal treatment pins and annular supports are removed.

EFFECT: increased reliability of rib operation is achieved.

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Description

The invention relates to mechanical engineering and can be used in aircraft and other fields of technology in the manufacture of shells from composite materials (CM), which are installed on units, pipelines and actuators of the control system.

A known method of manufacturing stiffeners (frames) from composite materials on the shell of rotation (see Bulanov IM, Vorobey VV Technology of rocket and aerospace structures from composite materials: Textbook for high schools. M.: Publishing house of MSTU. N.E.Bauman, 1998, pp. 458-460). The formation of the frame profile on the shell of KM consists in winding alternating annular layers of woven tape and fibers on a shelf between two walls. The required height of the frame profile is provided by the required number of layers of tape and fiber. Then carry out the polymerization of the frame and the shell.

In the above-described method of forming the frame, the holes can only be drilled. However, the drilling of the frame, due to the cutting of tapes or bundles, significantly reduces its strength and rigidity of the connection. In addition, the frame located on the shell may be smaller in diameter than the end frames, and be located at a great distance from them. These circumstances significantly complicate the opening of holes in it by drilling.

The technical task is to increase the reliability of the operation of the frame and the product as a whole by improving the technology of manufacturing the frame.

The technical result is achieved by the fact that in the method of forming a power frame from composite materials, including laying and winding the tapes and bundles impregnated with a binder at the location of the frame to obtain a given height of the frame, followed by heat treatment of the resulting package and making holes in it, at the location of the frame the distance from each other, equal to the width of the frame, ring stops with a height not less than the height of the formed frame, between the ring stops produce winding harnesses or tapes until the hole placement boundary is reached. Then, pins of a diameter equal to the diameter of the holes are installed in the ring stops, and tissue segments with a thickness equal to the diameter of the holes are laid between the pins, then the frame is wound up to a given height, after heat treatment, the pins and stops are removed.

Figure 1 presents the appearance of the shell of KM with the frame.

Figure 2 presents a fragment of the shell without the frame.

Figure 3 presents the installation of ring stops.

Figure 4 shows the formation of the lower part of the frame to the boundary of the location of the holes.

Figure 5 shows the installation of pins forming holes in the frame of KM.

Figure 6 shows the layout of the tissue segments between the pins.

7 shows a formed frame.

On Fig shows the shell together with the frame after polymerization of the binder and removal of the pins.

Figure 9 shows the completion of the manufacture of the shell with the frame with holes after removal of the ring stops.

The following positions are shown in the figures:

1 - shell made of composite material,

2 - annular stops forming the side surfaces of the frame,

3 - bundles or tapes forming the lower part of the frame,

4 - pins,

5 - tissue segments,

6 - bundles or tapes forming the upper part of the frame,

7 - power frame on the shell of KM.

The method is as follows.

Ring stops 2 are installed on the power shell 1 from KM (Fig. 1) and fixed on the shell 1 so that the axis of the holes d coincides and the gap Δ between the ring stops was equal to the thickness of the formed frame (Fig. 3). Then, in the gap Δ between the annular stops 2, bundles or woven tapes 3 are wound (Fig. 4) until the lower part of the frame is formed (up to the boundary of the hole placement). In the holes of the annular stops 2 set pins 4 of a diameter equal to the diameter of the holes in the formed frame (figure 5). Between the pins 4 on the adhesive or binder spread fabric segments 5 with a thickness equal to the diameter of the pins 4 (Fig.6). Then produce ring winding of bundles or tapes 6 forming the upper part of the frame (Fig.7). The shell with the frame is subjected to heat treatment to polymerize the binder (Fig. 8) and the pins and stops are removed (Fig. 9).

Using the method of forming a power frame will allow you to jointly form a frame with holes on the shell of KM, to exclude drilling holes, increase the rigidity and strength of the frame and increase the reliability of the product as a whole.

Claims (1)

A method of forming a power frame on a shell made of composite materials, including winding the bundles impregnated with a binder or tapes at the location of the frame to obtain the specified height of the frame, followed by heat treatment of the resulting package and making holes in it, characterized in that the location of the frame is set at a distance from each other, equal to the width of the frame, ring stops with a height not less than the height of the formed frame, between the ring stops, make bundles or tapes up to reaching the boundaries of the placement of holes, then pins with a diameter equal to the diameter of the holes are installed in the ring stops, and tissue segments with a thickness equal to the diameter of the holes are laid between the pins, then the frame is wound up to a given height and after heat treatment the pins and ring stops are removed.

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