METHOD FOR MANUFACTURE OF BLADE-TYPE ELEMENTS FOR CASCADES OF THRUST REVERSOR BY MOULDING OF COMPOSITE MATERIAL Russian patent published in 2009 - IPC B29C70/08 B29C70/34 F02K1/64 

FIELD: technological processes.

SUBSTANCE: group of inventions is related to method for manufacture of row of serially installed separate elements, which are distant from each other along at least part of their length, for instance blades of thrust reversor cascade blades or impeller blade, out of single premix (previously prepared mixture) and to design of these elements. Premix 8 contains at least one layer of unidirectional solid fibres 11, which are previously impregnated with resin, in uniform volume ratio, and filler 9. Premix is oriented along larger size of elements (direction X-X1). As necessary equipment, stamping tools are used, comprising matrix 3 and cover 4, which totally create a row of cavities 6a, 6b, 6c, etc. Shape of cavities has larger size and smaller cut and matches shape of finished elements. Cut is located in plane, which is perpendicular to larger size. Cavities of mold communicate to each other via special channels 7a, 7b, 7c and etc, which are arranged between cavities of each pair of cavities. Volume of channels is selected so that during stamping larger part of premix 8 plate, which is located opposite to channels, is forcedly directed to the side of blades. Premix 8 is placed into tool so that it affects row of cavities 6a, 6b, 6c, etc., and is oriented so that there are fibres along every cavity, which pass along larger size and relate to at least one layer. Premix 8, which is placed in this manner, is stamped to produce row of serially installed elements, having higher content of filler compared to volume ratio of initial premix. Besides elements 12a, 12b, 12c, etc are connected to each other with connection webs of "meshed base material" 13a, 13b, etc, which correspond to channels 7a, 7b, 7c, etc and have lower content of filler compared to volume ratio of initial premix. Afterwards, "meshed base materials" are removed. Semi-finished product produced in this manner consists of parts (12a-12c), out of which elements are then produced, as well as connection meshed webs (13a, 13b), the latter are removed afterwards. Method of invention may be used for production of different articles, for instance design, comprising elements produced during realisation of invention method. Such articles include, for instance cascade for thrust reversor of aviation engine or impeller for compressor or part of such impeller.

EFFECT: provision of economic solution to produce smooth streamlined profiles with required mechanical strength to manufacture elements with method of composite materials pressure moulding.

16 cl, 9 dwg