Patent ID: 7410089
Filing Date: 2008-08-12
Classification: B23K,B23P,F01D,F05B,F05D,Y10T

Abstract:
1. A method of making an aerofoil blisk comprising a plurality of aerofoil blades joined to a disc to extend radially outwardly therefrom, the method including the steps of: forming a blade member having a stub for joining to the disc, the stub being shaped with flat ends and having a wide and a narrow section across the length of the blade member, the ratio of the widest to the narrowest part of the stub being less than 2 to reduce the camber of the stub; joining the stub of the blade member to the disc by linear friction welding involving oscillating the blade member tangentially relative to the disc; and machining excess material from the blade member to form the blade member wherein both an end of the leading edge region and an end of the trailing edge region of the stub are defined by a straight edge which is substantially parallel to the oscillation directions wherein the leading and trailing edges of the stub include sharp corners wherein said straight edge extends between said sharp corners.