JPH08270793A - Manufacture of pressure vessel - Google Patents

Abstract

PURPOSE: To form a pressure vessel desirably without being influenced by the length of a cylinder part and the dimensional difference of both side opening parts in the pressure vessel having dome parts of approximately semicircular shape on both end sides of the cylinder part and circular opening parts at the center parts of both dome parts. CONSTITUTION: At the time of forming a pressure vessel (rocket motor case R) having dome parts 2, 3 on both end sides of a cylinder part 1 and opening parts 4, 5 at the center parts of both dome parts 2, 3 on the basis of a filament winding method, fiber F is wound around the dome parts 2, 3 by in-plane winding, and continuously the fiber F is wound around the cylinder part 1 by helical winding to form the pressure vessel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure container made of fiber reinforced plastic which is molded based on a filament winding method, and more particularly to a pressure container used for a rocket motor case or the like.

[0002]

2. Description of the Related Art A pressure vessel made of fiber-reinforced plastic molded based on a filament winding method is used as a rocket motor case, for example, "Second Edition-Aerospace Engineering Handbook" issued by Maruzen on September 30, 1992. ] No. 9
Some are described on page 32 and page 933.

In such a rocket motor case, a mandrel corresponding to the shape of the case is wound with a fiber impregnated with a thermosetting resin to form a preform, which is evacuated and heated. By doing so, it is cured and molded. At this time, the method of winding the fiber around the mandrel is selected according to the shape of the motor case.

The mandrel 100 shown in FIG. 2 is for molding a rocket motor case having substantially semicircular dome portions on both end sides of a cylinder portion, and a rotary shaft 101, 102 supporting both end portions forms a dome portion. An opening is formed in the center. The winding method of the fiber F in the illustrated mandrel 100 is an in-plane winding in which a flat surface is formed inside the locus when it makes one round through the dome portions on both sides, and it is continuously wound by shifting this plane for each round. is there. This in-plane volume is, for example, AIAA JOURNAL VOL.
1 NO. 12, pp. 2842-2844.

Further, as another method of winding the fiber, there is a helical winding forming an equal tension curved surface, and in the case of molding a rocket motor case having the cylinder portion as described above, in the in-plane winding, the fiber with respect to the axis line in the cylinder portion is wound. The angle of inclination of is slightly different depending on the place, while the angle of inclination is constant in helical winding. These techniques are described in "The University of Tokyo Aerospace Exploration Report-Vol. 15, No. 4" of November 1979.

[0006]

However, in manufacturing the conventional rocket motor case (pressure vessel) as described above, the in-plane winding is suitable for a spherical or substantially spherical case and has a cylinder portion. In the case of a case, the angle of inclination of the fiber with respect to the axis becomes smaller as the cylinder length becomes longer, which makes it easier for the fiber to slip, which makes it unsuitable for cases where the cylinder length is relatively long. Can cope with the case of a long cylinder part, but is limited to those in which the diameters of the openings on both sides are consequently equal due to the winding conditions for forming a generally-used equal tension curved surface shape. . If you have to make the diameters of the openings at both ends the same,
On the small diameter side (usually the igniter side), the boss attached to the opening becomes large, resulting in an increase in weight and an increase in component cost.

Therefore, in the conventional method of winding the fibers in the production of the pressure vessel, it may be difficult to form the fiber depending on the conditions such as the length of the cylinder portion and the size of the opening, and such a problem can be solved. It was a challenge.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above conventional problems, and has substantially semicircular dome portions on both end sides of a cylinder portion, and a circular opening portion at the center of both dome portions. In a pressure vessel having, based on the filament winding method, it is possible to provide a method of manufacturing a pressure vessel which can be satisfactorily molded without being influenced by the length of a cylinder portion or the dimensional difference between openings on both sides. Has an aim.

[0009]

A method for manufacturing a pressure vessel according to the present invention is a pressure vessel having substantially semicircular dome portions on both end sides of a cylinder portion and circular opening portions at the centers of both dome portions. When molding is based on the filament winding method, fibers are wound around the dome by in-plane winding according to the mesh theory, and then the cylinder is wound around by fibers by helical winding to form a pressure vessel. The above configuration is used as means for solving the problem.

The cylinder part of the in-plane winding according to the mesh theory is not exactly the same as the cylinder part of the curved surface of equal tension, but in reality, the cylinder part of the in-plane winding according to the mesh theory is a helical winding with a substantially constant winding angle. It is focused on the fact that it does not matter. It can be explained that the length of the cylinder portion can be changed (under a constant winding angle) if the cylinder portion can be assumed to be helically wound, and the above configuration can be implemented. Of course, both dome parts are on a plane, but both dome parts are in a twisted position.

[0011]

In the method of manufacturing a pressure vessel according to the present invention, the fibers are wound around the dome portion by in-plane winding. Therefore, it is possible to deal with the case where the diameters of the openings formed at the centers of the dome portions on both sides are different. In addition, since the fiber is wound around the cylinder by helical winding, the inclination angle of the fiber with respect to the axial direction in the cylinder becomes constant, and even if the cylinder is relatively long, the fiber Winding is performed without causing slippage.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a pressure vessel according to the present invention will be described below with reference to the drawings. Here, a rocket motor case is exemplified as the pressure vessel.

Rocket motor case R shown in FIG. 1 (b)
Is made of fiber-reinforced plastic based on the filament winding method, has substantially semi-circular dome parts (end plate parts) 2 and 3 on both end sides of the cylinder part 1, and has center parts of both dome parts 2 and 3. It has circular openings 4 and 5.

The openings 4 and 5 have different diameters D.
1 and D2, for example, after filling with solid propellant, a closing member or an igniter is attached to the small opening 4 on the left side of FIG. 1, and a propelling nozzle is attached to the large opening 5 on the right side of FIG. Mounted.

To mold the rocket motor case R described above, the mandrel 10 shown in FIG. 1 (a) is used. The mandrel 10 has a cylinder molding portion 11 corresponding to the inner shape of the cylinder portion 1 and dome molding portions 12 and 13 corresponding to the inner shape of the dome portions 2 and 3, and the opening portions 4 and 5 are provided on both end sides. Are supported by rotating shafts 14 and 15 for molding.

Then, while the mandrel 10 is rotated, the continuous fiber F impregnated with the thermosetting resin is wound around, and at this time, the planes S1 and S2 are formed inside the loci of the dome molding portions 12 and 13. The fiber F is wound by in-plane winding, the fiber F is wound by the helical winding on the cylinder molding portion 11, and the fiber F is continuously wound while repeating the in-plane winding and the helical winding at each part, and the rocket motor case (preform ) Mold R.

In such a manufacturing method, since the fiber F is wound around the dome molding portions 12 and 13 by in-plane winding, the openings 4 and 5 formed in the dome portions 2 and 3, respectively.
Even if the diameters D1 and D2 of the fiber are different from each other, the winding is performed well, and since the fiber F is wound around the cylinder forming portion 11 by helical winding, the inclination angle α of the fiber F with respect to the axial direction of the cylinder portion 1 is constant. As
Even if the cylinder portion 1 is relatively long, the fiber F is not slipped and good winding is performed.

Further, the rocket motor case (preform) R is subjected to evacuation and heat treatment to be cured and formed, and by winding the above-mentioned fiber F, the fiber orientation state is good and desired. It will be strong.

In the above embodiment, the rocket motor case is exemplified, but the present invention can be applied to the manufacture of other pressure vessels, and the pressure vessel having a short cylinder portion and the pressure vessels having the same opening diameter on both sides can be used. Can also be applied.

[0020]

As described above, according to the method for manufacturing a pressure vessel of the present invention, the cylinder portion has substantially semicircular dome portions at both ends thereof, and the circular opening is formed at the center of both dome portions. In a pressure vessel having a portion, based on the filament winding method, the pressure vessel can be satisfactorily molded without being influenced by the length of the cylinder portion or the dimensional difference between the openings on both sides, and in particular, the cylinder portion It is possible to mold very well a long one or one having different diameters of the openings on both sides, and it is possible to remarkably enhance the moldability of the pressure vessel having the cylinder part, the dome part and the opening part.

[Brief description of drawings]

FIG. 1 shows a method for manufacturing a pressure vessel according to the present invention,
It is a side view (a) explaining the point of winding a fiber around a mandrel, and a sectional view (b) explaining a rocket motor case as a pressure container.

FIG. 2 is a side view illustrating a procedure for winding fibers by in-plane winding.

[Explanation of symbols]

 F Fiber R Rocket motor case (pressure vessel) 1 Cylinder part 2 3 Dome part 4 5 Opening part

Claims (1)

[Claims] 1. A pressure vessel having substantially semicircular dome portions on both end sides of a cylinder portion and having circular opening portions at the centers of both dome portions is molded on the basis of a filament winding method. A method for producing a pressure vessel, comprising winding a fiber by in-plane winding, and continuously winding the fiber around the cylinder by helical winding to form a pressure vessel.