Laser welding forming method for sectional type composite material shell of solid rocket engine

Abstract

The invention discloses a laser welding forming method for a sectional type composite material shell of a solid rocket engine. The laser welding forming method comprises the following steps that (1),a core mold is prepared; (2), a heat insulation layer is manufactured; (3), sectional prefabricated parts are manufactured; (4), surface treatment is carried out on the prefabricated parts; (5), laserwelding assembly is carried out on the sectional prefabricated parts; and (6), the outer layer of the shell is reinforced. According to the laser welding forming method for the sectional type composite material shell of the solid rocket engine, a laser welding forming process is designed according to various loads of an engine shell and sectional connecting parts, so that inner composite layer connection and integral forming of the engine shell are achieved for shell front and rear head plate prefabricated parts and shell barrel segment prefabricated parts correspondingly through laser welding and outer layer winding reinforcement, efficient and reliable connection of the sectional type composite shell is achieved, the production cost is further reduced, and the inertia mass of an engineis reduced; and meanwhile, the production efficiency and the charging space are improved.

Description

technical field [0001] The invention relates to the technical field of carbon fiber composite material solid rocket motor casing manufacturing technology, in particular to a laser welding forming method for a solid rocket motor segmented composite material casing. Background technique [0002] The solid rocket motor has a large charge, simple structure, high mobility and reliability, and strong survivability. It is the main power device of a large solid launch vehicle. The solid rocket motor housing is the place where the propellant grain is stored and burned. It needs to withstand various complex loads under high temperature, high pressure, high speed and special chemical atmosphere during work. It must be made of high-performance structural materials. The use of carbon fiber reinforced thermoplastic composites can realize efficient and reliable manufacturing of engine housings, further reduce production costs and engine negative mass, and improve engine mass ratio and over...

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Problems solved by technology

[0004] At present, the welding and forming process of segmental manufacturing of domestic engine casings is mostly used for small and medium-sized metal solid rocket motors, and the segmental molding of large-scale composite engine casings is mostly connected by metal connectors and pin structures. This design increases the negative mass of the engine and damages. The continuity of the fiber at the connection part is ensured, so that the fiber opening part is prone to stress concentration and low-pressure failure under the condition of fully blocked internal pressure, and it is difficult to meet the reliability of the connection structure under the high-pressure working condition of a large-diameter engine

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