| 摘要 |
1,261,081. Making gas turbine blades; aircraft and boats. ROLLS-ROYCE Ltd. 22 Feb., 1969, No. 9666/69. Heading B3A. A method of shaping a cellular material e.g. aluminium in which the sides of the finished structure are curved comprises cutting one side of the material to a developed form of the finished structure wherein one side thereof is plane, working at least one side of the developed form so as to reduce its resistance to crushing and then crushing the developed form between dies so as to produce the required finished structure shape e.g. the hollow blade used in gas turbine engines, an aircraft wing or fuselage or the hull of a boat. In an embodiment one of the curved surfaces 14 desired for the finished turbine blade core (Fig. 5) is developed into a plane surface (Fig. 3) on which to locate the structure so as to machine the curved surface 16 by a spinning disc cutter. After machining the structure is placed in a die block 18 and the edges 20 of the honeycomb walls which form the plane surface are bent to a depth of ten thousandth of an inch to reduce their resistance to crushing. The bending is effected by a studded tool 24 (Fig. 4). After bending the blade structure is placed between dies and given its aerofoil shape. |
