MANDREL FOR MAKING ARTICLES FROM COMPOSITE MATERIALS Russian patent published in 2012 - IPC B29C41/02 

FIELD: process engineering.

SUBSTANCE: invention relates to production of parts from composite materials, namely, power plant shells, mainly, solid propellant engine nozzle unit parts. Proposed mandrel comprises forming section made up of truncated cone, cover and flange jointed to small and large faces of said forming section, respectively. Note here that flange is secured to detachable spring and pressure rings that embrace forming section and circular clearance. Chamber formed between spring ring inner surface and forming section outer surface communicates via section hole with unions arranged inside mandrel, said unions being furnished with shutoff valve. Note here that cover is jointed with ring embracing its peripheral surface, ring outer surface extending beyond forming section edges to make a ledge in joint zone.

EFFECT: higher quality of products, ease of hardened material carcass withdrawal from mandrel.

3 cl, 6 dwg