METHOD FOR MAKING PRODUCTS OF COMPOSITE MATERIALS Russian patent published in 2011 - IPC B29C43/30 B29C70/44 B29D22/00 

FIELD: process technologies.

SUBSTANCE: invention refers to technology of products of composite materials, namely, load-bearing unit parts, e.g. nozzle mouths of solid-propellant rocket motors (SPRMs). The process for making the products of composite materials involves coating of a rigid mandrel with an initial material, mounting of the mandrel to produce a material package in a elastic diaphragm filled with a binding agent and placed in a hydraulic steriliser, and impregnation of the material package with the binding agent under pressure of a working fluid transferred to a package surface through the elastic diaphragm. The impregnation process involves filling the hydraulic steriliser with the working fluid at 100-125 litres a minute, generating pressure 5 kgs/cm² and keeping the material package under this pressure for 10 minutes; it is followed with pressure release and working fluid pump-down from the hydraulic steriliser at the same speed preset for the filling process; the procedures carried out are repeated. The hydraulic steriliser is filled with the working fluid once again, and the material package is kept under hydrostatic fluid pressure for 12 hours, then the working fluid is pumped-down; a vacuum medium is generated, and the mandrel with the impregnated material package is removed from the hydraulic steriliser.

EFFECT: use of the invention for making large capacity inserts of the SPRM nozzle units has provided high-quality manufacturing of the parts of the composite materials with ensuring required adaptability to manufacture.

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