METHOD FOR SHAPING COMPLEX-PROFILE INTER-BLADE DUCTS OF MONOIMPELLER OF GAS-TURBINE ENGINE AND TOOL FOR PERFORMING THE SAME Russian patent published in 2005 - IPC

FIELD: working parts by cutting, namely processes and equipment for making aircraft engines.

SUBSTANCE: in order to enlarge manufacturing possibilities and to improve efficiency, cutting of back, trough and bottom of inter-blade duct is realized simultaneously for one technological procedure by means of one annular cutting tool and blade edges are further worked before finishing them. Rotation axes of tool and mono-impeller are arranged in such a way that they cross by predetermined angle depending upon curvature of worked surfaces while providing rectilinear motion of cutting tool along three axes of three-dimensional coordinate system and rotation of cutting tool around said three axes. Tool includes cutting end members arranged along annular perimeter of body. Tool is in the form of T-shaped cutting members arranged uniformly along perimeter of annular body with width equal to that of inter-blade duct in root cross section. T-shaped cutting members have end, outer and inner lateral cutting edges. Diameter of circle described around outer lateral cutting edges of tool is equal to that of circle inscribed to trough profile of mean cross section of blade by three points. Non-equal legs of outer and inner lateral cutting edges of trough profile correspond to twisting value of blades along height and spacing from rotation axis of cutting tool till projections of nearest points of inlet and outlet edges of boundary cross section of inter-blade duct on rotation plane of tool. Length of T-shaped cutting member is determined by value exceeding depth of inter-blade duct.

EFFECT: enlarged manufacturing possibilities, improved efficiency.

2 cl, 6 dwg