Procedure for fabrication of pipe out of composite materials

FIELD: machine building.

SUBSTANCE: here is disclosed fabrication of pipe out of composite materials consisting in forming adhesion layer on mandrel, in successive forming sealing, stretching, power and under winding layers by winding composite materials impregnated with polymer binding and in following laying polymer binding on it. The sealing layer is formed by either winding two layers of a band out of non-woven material with pitch of 0.5 of band width impregnated with polymer binding and successive laying one layer of glass cloth on it or by winding two layers of the band out of glass cloth impregnated with glue at pitch of 0.5 of band width. The power layer is formed by the method of cross-layered lengthwise-cross winding out of strands of glass twisted complex thread soaked with polymer binding. The stretching layer is made by spiral-screw winding strands of glass twisted complex thread without impregnation with polymer binding. The under winding layer is formed by spiral screw or cross-layered lengthwise-cross winding strands out of glass twisted complex thread soaked with polymer binding.

EFFECT: increased weight perfection of transport-starting container out of pipe fabricated by winding composite materials; facilitation of pressure tightness and rigidity of pipe.

 

The invention relates to rocket technology, in particular to the manufacture of transport-launch containers for transporting, storing and launching rockets, the method of “wet winding” pipes made of composite materials, and can also be used in the national economy for the manufacture of pipes of different diameters and destination from sewer to water and takes into account the increasing requirements for higher perfection of their designs.

A known method of manufacturing a pipe made of composite materials (patent of Russia №2154766 from 20.08.2000,, MPK7 F16L 9/12), including the formation of mandrel sealing layer of rubber and the subsequent formation of the power frame by winding spiral layers of roving, impregnated with a polymeric binder, thus forming a sealing layer is carried out by winding on a mandrel, pre-coated with a layer of anti-adhesive material tape from devulcanizing chemically and abrazivostruynoy rubber with a thickness of 1 mm with a step equal to the width of the tape, and then wrap a second layer of tape from devulcanizing rubber offset relative to the first layer by 0.5 step and then the third layer is wound devulcanizing rubber starting winding from the opposite end of the mandrel, then install back-up ring made, for example, from a tape-nature is a, consisting of 3-5 layers, at a distance of 0.5-2.0 m along the length of the pipe, which is placed on 2-3 layers devulcanizing rubber, and in the area of the nipple ends also install support ring, then produce a wound package of five adhesive layers, this package includes sequential winding of one layer is not impregnated binding tape from a low density, for example, woven material, winding a layer of tape, non-woven fabric, impregnated with a binder, a double helical winding layer of a thickness not exceeding 1.2 mm glass or basalt roving thickness not exceeding 0.5 mm and a tension of the roving 0,4-2,0 kg 1 m Assembly roving, and then form the structure of power by winding package up to ten double-spiral layers of roving, and in the area of installation of each support ring to form an annular ledge in the form ravnomernogo triangle with rounded top, made of annular layers of roving, after which form at the ends of the pipe connecting elements.

However, this method of manufacturing a pipe made of composite materials and pipe manufactured according to this method, for all its merits, but it is a reliable ensure the integrity and rigidity of the pipe due to the complexity of forming the sealing rubber layer and a consistent location via a 0.5-2.0 m embedded items shall now - support rings, has the following disadvantages when applied to pipes made of composite material, of which further made transport-launch containers for transportation and storage of missile launch:

1) the complexity of manufacturing the sealing layer due to the need to carefully promote adhesion around the perimeter stacked on the mandrel devulcanizing tape rubber, because of this is placed a few layers of rubber with overlap by the width of the tape, which leads to unjustified increase of the mass of the resulting pipe is impractical;

2) internal rubber coating creates a lot of resistance when moving missiles in transport-launch container due to the large coefficient of friction rubber (inner surface of the container should be rigid and have a small coefficient of friction), which will lead to vibrations and disturbances in the launching of a rocket from the container with the launcher, which is unacceptable;

3) the possibility of ignition of the inner sealing layer of the transport and launch container at the exit of the rocket, since the temperature of the exhaust gases reaches 3000°C, which is also unacceptable.

Object of the present invention is to eliminate the above drawbacks, such as increasing the weight of perfection transport-launch Conte is Nera, made of pipes, made by filament winding of composite materials, ensuring its integrity and stiffness.

This is achieved in that in the method of manufacturing a pipe made of composite materials comprising forming mandrel with a release layer and the subsequent formation of sealing, mounting, power and palmoticeva layers by winding the composite material, impregnated with a polymeric binder, forming the sealing layer is produced or by winding two layers of tape, non-woven material with 0.5 of the width of the tape impregnated with a polymeric binder and then laying him one layer of fiberglass, or by winding two layers of strips of fiberglass impregnated with glue, with 0.5 of the width of the tape, forming a power layer produced by the method of the cross-longitudinal-transverse winding of the strands glass woven multifilament yarn, impregnated with a polymeric binder, forming forming layer produced by the method of spiral helical winding of the strands stekljannoi twisted multifilament yarn, impregnated polymeric binder, and forming palmoticeva layer depending on the design of the seats on the tube produced by the method of the spiral screw or method of the cross-longitudinal-transverse winding of strands of glass woven multifilament yarn,impregnated with a polymeric binder, when this mass fraction of the polymer binder used in the formation of power and palmoticeva layers should be at least 50%, and the impregnated composite materials provide preheated to 50-55°with a polymeric binder.

The essence of the invention lies in the fact that the new method of manufacturing a pipe made of composite materials provides optimal weight get pipes through the use of new composite materials, new technologies winding and the obtained experimental data due to the optimal selection of the necessary quantity of polymeric binder and a sealing layer that allows you to maintain a minimum weight, reliable sealing of the pipe, its strength and stiffness.

The drawing shows the proposed scheme winding pipe made of composite materials, where:

1 - pot;

2 anti - stick layer;

3 - sealing layer;

4 - power layer;

5 - forming layer;

6 - Podkolodny layer.

A method of manufacturing a pipe made of composite materials is as follows.

On a rotating mandrel 1, mounted on a winding machine, previously having degreased its surface, spraying method applied adhesive layer 2 of silicon grease. For the formation of the sealing layer from the front of the headstock of the machine in two passes made in the field, and the first winding of the first layer of tape, non-woven material Mat surface glass brand IPU” increments of 0.5 of the width of the tape, then produce the impregnation of the resulting layer of a polymeric binder, preheated to 55°C, aged 15-20 min until saturation, the frequency of rotation of the mandrel 10-12 rpm Then in the opposite direction from the tailstock of the machine to produce the winding of the second layer of the same material and in the same sequence. The obtained winding the sealing layer when the non-rotating mandrel in a longitudinal direction in a single pass over the entire length of the mandrel laid fiberglass, for example, grade: AU, TSA, ES-38, ES-P. Pets winding sealing layer to produce a ribbon of glass fabric pre-impregnated with adhesive BK-CG, impregnated polymeric binder in two passes with 0.5 of the width of the tape. Then make the winding of the power layer 4 by a method of the cross-longitudinal-transverse winding of strands of glass woven multifilament yarn, for example VMPS, IS impregnated with a polymeric binder. Then make a winding forming layer 5 in a single pass method spiral helical winding of strands of glass woven multifilament yarn, impregnated polymeric binder, because they are impregnated with a polymeric binder directly in the winding process of “wet method”, due to an excess of binder in the strands of the previous power layer. It is followed by the formation of palmoticeva layer 6 depending on the structure, the AI seats on the tube by the method of the spiral screw or method of the cross-longitudinal-transverse winding of strands of glass woven multifilament yarn, impregnated with a polymeric binder, with mass fraction of the polymer binder used in the formation of power and palmoticeva layers should be not less than 50%.

This is done to ensure the reliable exclusion of voids between the fibers in the layers during winding. Heating of the polymeric binder to 55°C provides the greatest fluidity of the binder, which is necessary for impregnation of composite materials. The polymerization of the polymeric binder is wound pipe is held in a heating Cabinet for 14 h at 160°C on a rotating mandrel that provides uniform distribution of the polymer binder according to the thickness of the pipe walls during polymerization. Removing the mandrel from the heating Cabinet is at a mandrel with a tube of normal temperature. To remove the cured pipe from the mandrel one of the ends of the tubes have a winding exceeding the outer diameter of the pipe, for which a special device to draw the pipe from the mandrel. After removing the pipe spend machining end faces and seats on the tube in the desired size.

In the manufacture of the pipe on the mandrel are two methods of winding - spiral-spiral method of winding (circular, tangential), which consists in laying the formed thread tape on the surface of the mandrel along a helical line, and the method of the cross-procainamidesee winding, at which layer of longitudinal-transverse reinforcement is formed not on the entire length of the mandrel and within the technological tape yarns are laid on the mandrel spiral-spiral method with small feed. While strands of ribbon ring reinforcement impregnated with a polymeric binder directly in the winding process “wet”impregnation of dry axial threads carried on the mandrel due to an excess of binder in the tape ring strands, while the axial dry yarn fed to the mandrel by means of a swivel, which revolves around moving impregnated polymeric binder tape.

1. A method of manufacturing a pipe made of composite materials comprising forming mandrel with a release layer and the subsequent formation of sealing, mounting, power and palmoticeva layers by winding the composite material, impregnated with a polymeric binder, characterized in that the formation of the sealing layer is produced by winding two layers non-woven tape material with 0.5 of the width of the tape impregnated with a polymeric binder and then laying him one layer of fiberglass or by winding two layers of strips of fiberglass impregnated with glue, with 0.5 of the width of the tape, forming a power layer produced by the method of the cross-longitudinal-transverse winding of the strands of the sty what Lannoy twisted complex thread impregnated with a polymeric binder, forming forming layer produced by the method of spiral helical winding of strands of glass woven multifilament yarn, impregnated polymeric binder, and forming palmoticeva layer produced by the method of the spiral screw or method of the cross-longitudinal-transverse winding of strands of glass woven multifilament yarn, impregnated with a polymeric binder.

2. The method according to claim 1, characterized in that the impregnation of composite materials provide a preheated 50÷55°With a polymeric binder.



 

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