| 摘要 |
1,190,293. Making bladed rotors. ROLLSROYCE Ltd. 13 March, 1969, [20 March, 1968], No. 13498/68. Heading B3A. [Also in Division F1] A turbine, compressor or ducted fan rotor is constructed by assembling together a series of annular or part-annular I-section wall members 10, Fig. 1, grinding off the tops of the I-sections, filling the annular recesses 12 between the members 10 with fibrous material 13, Fig. 2, and securing in slots 11 tangs (17), Fig. 4 (not shown), on the roots 16 of blades 15 formed of fibrous material. The wall members 10 may be formed from epoxy resin reinforced by circumferentially extending carboniferous fibres of polyacrylonitrile, from carboniferous material reinforced with carboniferous fibres, from foamed synthetic resin or ceramic material, or from metal. The slots 11 are formed by machining after the members 10 have been bonded together, when the latter are fully annular, or, when they are part annular, by spacing circumferentially adjacent members 10 apart. The material 13 may be of carboniferous fibre formed from polyacrylonitrile and is inserted in the recesses 12 by a winding operation after being coated with resin. The recesses 12 increase in cross-sectional area in the radially inward direction to improve keying of the material 13 into the recesses. The blades 15 are also formed from carboniferous fibres, which may be cross-woven as at 24, 25. After insertion of the blade roots 16 in the slots 11, the troughs 22 defined between adjacent roots and rotor end pieces 21 are filled with sheets 23 of cross-woven fibrous material and the whole assembly is then cured in a mould to bond all the fibres together. |
