| 摘要 |
1537559 Winding hollow bodies with internal flanges DEFENCE SECRETARY OF STATE FOR 23 Aug 1977 [14 Sept 1976] 38075/76 Heading B8G To wind a hollow body having at least one internal circumferential flange, two mandrel portions are separately wound with filament, the windings extending across at least one end of each portion so that the windings extend stably inwards towards the mandrel axes, a second filamentary winding is made between the inwardly extending parts of the first windings, a third filamentary winding is made over the first and second windings, and the mandrel portions are removed. A cylindrical mandrel, Fig. 1, comprises parts 1, 2, 1<SP>1</SP>. Separate helical windings of impregnated fibre are formed on parts 2, and flanges 5 being formed by chords, lying across the end faces of parts 2, which arise because of a dwell in fibre traverse at its reversal points. Circumferential winding 6 then fills in the flange, and further covering winding 7 is formed. Initial windings 4<SP>1</SP>, Fig. 3, may be formed on separated mandrels 2<SP>1</SP> which are then brought together with spacer ring 10. The inward flange may have the shape shown in Fig. 4. Shrunk film may be used on the outside of the uncured windings, collapsible or frangible mandrels may be used where the end or other flanges are to be retained, and the mandrels may be of any shape. The flanges may be wound across pegs in the end faces in the mandrel parts. Glass or carbon fibre may be used. |
