Improvements in and relating to turbine rotors with blades and a method for the manufacture of these rotors

摘要

799,910. Making turbine blades. NAAMLOOZE VENNOOTSCHAP BRONSWERK. May 15, 1956, No. 15138/56. Class 83 (2). [Also in Group XXVI] A turbine rotor blade is formed from a piece of sheet metal and is shaped to form a vane portion 2, an intermediate portion 3 and a root portion 4 having extensions 4a, 4b. The vane portion is formed to the desired profile by bending and by milling at the leading and trailing edges and one of the root extensions 4b is bent through a right angle. The rim of the rotor disc 5 is formed with transverse slots 6 of width equal to the thickness of the blade root portion, also with circumferential grooves 7 on either side. The blades are then entered laterally in the slots 6 and the root extensions 4b engaged in the groove 7 at one side of the rotor disc. The extensions 4a are then bent to engage the groove 7 at the other side of the rotor disc. The edges 8, 9, 10, 11 of the rotor grooves 7 are then rolled so as to engage the edges of the root extensions. A shroud band is secured around the blade tips by means of the rivets 1.