Preparation mold and preparation method of integrated composite material spray pipe

Abstract

The invention discloses a preparation mold of an integrated composite material spray pipe, which comprises a core mold head section expansion layer preparation mold and a core mold tail section expansion layer preparation mold detachably connected with the core mold head section expansion layer preparation mold, the core mold tail section upper cone expansion layer preparation mold, the core mold tail section middle cone expansion layer preparation mold and the core mold tail section lower cone expansion layer preparation mold are detachably connected in sequence, and the diameter from the core mold tail section upper cone expansion layer preparation mold to the core mold tail section lower cone expansion layer preparation mold is gradually increased. The invention further provides a preparation method of the integrated composite material spray pipe, the expansion layer is subjected to roughening treatment, the cloth bag is prevented from sliding in the winding and curing process, meanwhile, in the product curing process, the expansion layer is heated to expand, overall pressurization on the inner molded surface of the product is achieved, the product compactness degree is increased, and the service life of the product is prolonged. And the ablation resistance of the integrated composite material spray pipe is improved.

Description

technical field [0001] The invention relates to a preparation mold and a preparation method of an integrated composite material nozzle, belonging to the field of solid rocket motors. Background technique [0002] In recent years, with the increasing demand for space activities, the demand for launch vehicles in my country has gradually increased, which has been unable to meet the needs of existing launch missions. As the main power conversion device of low-cost launch vehicle, integrated composite nozzle has been widely used and highly valued in the industry. The integrated composite nozzle can significantly improve the engine's performance and mass ratio, which can fully increase the payload. The forming process of the integrated composite nozzle is complicated, and the traditional preparation method has the following defects: [0003] (1) It is directly wound on the metal mold. Because the friction coefficient between the cloth tape and the metal mold is small, the cloth...

AI Technical Summary

Problems solved by technology

At the same time, the resin becomes soft during the curing and heating process of the product, and the cloth tape will progress under the action of external curing pressure and slip to the small diameter end of the mold, resulting in serious polyglue lines on the inner surface of the integrated composite nozzle after molding, affecting product performance

[0004] (2) During the curing process of the traditional composite material nozzle, the metal mold cannot realize the pressure on the inner surface of the product, because the outer surface of the composite material nozzle directly contacts with the high temperature environment, it will first solidify and form a hard shell, resulting in the failure of the curing pressure to continue to be transmitted To the inside of the product, there will be more defects such as pores inside the product, which will seriously affect the product quality

When the nozzle is undergoing secondary curing, under the action of external curing pressure, due to the lack of mold support on the inner surface of the product, it is very easy to cause damage or cracks to the cured functional layer

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