METHOD OF MANUFACTURE OF BLADE FROM COMPOSITE MATERIAL Russian patent published in 2004 - IPC

FIELD: aeronautical engineering; manufacture of blades for flying vehicle propellers from composite materials. SUBSTANCE: proposed method includes assembly on table and in mold horizontally beginning with nose part which is molded in mold with the aid of release unit in elastic chamber and technological insert-stop; first, open-contour outer stack of blade is made and then heating element with anti-abrasive tippings is mounted on adhesive material on the outside of nose section of outer stack of blade, after which counter-weights are placed on adhesive material in inner cavity of nose section of outer stack of blade; assembly of closed nose channel is effected through successive placing in inner cavity of outer stack of blade, inner front open-contour stack, elastic chamber with release unit, rear open-contour stack to whose inner side additional flat stacks with metal plates are molded in blade shank; then blade blank thus assembled is placed in mold and technological insert-stop is placed in remaining cavity of non-closed part of outer stack of blade; mold is closed and pressure is created on nose section of blade first with the aid of release unit only and then pressure and temperature are raised in elastic chamber at preliminary molding of blade for obtaining required geometry; them it is cooled and mold cover is opened, non-closed part of outer stack of blade is slightly raised on side of cover, technological inset-stop is removed from mold and additional elastic chamber with release unit and intermediate wall are placed in cavity thus formed; release unit is preliminarily set to size of position of intermediate wall in chord; intermediate wall is preliminarily molded and is mounted on adhesive material after which elastic chamber is mounted between stringer molded preliminarily and intermediate wall; adhesive material is applied on free part of outer stack of blade remaining behind stringer and part of outer stack of blade which was slightly raised is lowered closing wall and stringer and forming closed intermediate and tail channels of blade; then cover of mold is closed; final molding is performed at gradual raising of pressure in elastic chambers and temperature of heating of mold; pressure in elastic chamber of tail channel is higher than that in remaining elastic chambers by 0.5-1.0 Mpa during entire period of final molding of blade from moment of delivery of pressure till its relief in the course of cooling. EFFECT: low cost of process; facilitated procedure of manufacture; reduced number of tools; enhanced stability of characteristics. 6 dwg