| 摘要 |
781,333. Moulding aircraft propeller blades &c. WARNKEN, E. P. April 16, 1955, No. 11018/55. Class 87(2). [Also in Groups XXVI and XXXIII] A blade of aerofoil section for example an aircraft propeller blade, comprises a vane portion formed of a plurality of substantially parallel elongated laminations disposed in a pack one on the other, and a root portion formed of laminations which extend transversely of and adjacent one end of the vane portion, the laminations being impregnated with a resin and being moulded to form the blade. The laminations may be of fibre-glass cloth impregnated with phenol-formaldehyde type resin. The laminations 14 forming the vane portion and the laminations 16 forming the root portion of a compressor blade are shown in Figs. 4 and 5, the root-forming laminations 16 being formed as convoluted rolls one on either side of the laminations 14. The laminations 14 are not all of the same width. In a further embodiment, Fig. 8, the root-forming laminations 23 are formed as a pack having an opening 24 therethrough, the pack being passed over the pack of vane-forming laminations. A moulding machine for forming the blades is shown in Fig. 7, and comprises a fixed die 28 supported on a stationary press plate 27<SP>1</SP> carried on a frame 27. An upper movable die 33 is carried on a platen 32 slidable on columns 31. The laminations 14, 16 are supported on the lower die 28 and the upper mould is moved downwardly by the hydraulic ram 46. The fibres at the root end of the blade are gripped by shoes 43, 44 during the vane-forming operation. The root-forming dies 39, 42 are disposed in slots 38, 41 in the fixed and movable dies 28, 33 respectively the two root-forming dies being moved towards each other by the hydraulic rams 51, 52 so as to mould the laminations 16 into the blade root portion, the root-forming operation being subsequent to the vane-forming operation. The dies may be heated to a temperature such that the resin impregnant can flow. The invention is also applicable to the construction of helicopter rotor blades, and to ducted fan blades of ducted fan type propulsion units. |
