Patent ID: 6627837
Filing Date: 2003-09-30
Classification: B23H,F04D,F05D

Abstract:
A method of manufacturing a stator stage for a turbine pump comprising the steps of:providing a workpiece (2) for obtaining said stator stage(11) having a disk (8) with a plurality of radial blades(12) joined thereto radially at inner and outer ends thereof and being separated by narrow channels (13) therebetween; providing an apparatus for electrical discharge machining having an electrical discharge machining tool (1) with at least one plate (3) equipped with at least one tongue-shaped member (7) being joined at one end with said plate (3) and extending along a peripheral edge(4) therefrom in a plane inclined relative to said plate (3), said machining tool forming a first electrode within said apparatus; placing said workpiece (2) within said apparatus in front of said electrical discharge machining tool (1), said workpiece (2) forming a second electrode therein; generating relative combined rotation and translation motions of said tool (1) and said workpiece (2) so as said tongue-shaped member(7) being within said disk (8) during said combined motions; and forming at least one channel (13) within said workpiece (2) radially limited at both ends and having shape, size and inclination corresponding with those of said tongue-shaped member(7).