METHOD OF AND ASSEMBLING FIXTURE FOR MANUFACTURE OF CENTRIFUGAL COMPRESSOR IMPELLER Russian patent published in 1998 - IPC

FIELD: mechanical engineering; manufacture of impellers and wheels of centrifugal compressors, fans, pumps and radial-flow turbines. SUBSTANCE: method of manufacture of centrifugal compressor impeller comes to making main and cover disks and blade blanks with additional allowances for machining and processing bases. Blade blank is made by cutting ring sector out of ring with surfaces corresponding to side surfaces of blade and with outer and/or inner beads located on impeller end at side of surface for making of mating surface with cover disk and having common end face surface. Blade blanks are fitted in assembling fixture along end face surface to form blade cascade and are secured by hold-down members, after which assembly is subjected to machining to provide mating of surfaces with main disk. Main disk is placed on blades and is connected with blades by soldering or welding. Then main disk with blades is taken out of assembling fixture and is installed on metal cutting tool processing bases of main disk. Blades are machined to form mating of surfaces with cover disk which is afterwards is connected with blades. Assembling fixture has ring member with flat mounting surface between ring beads and hold-down members installed on ring members. Distance between ring beads is chosen to provide orientation of blade blanks with limited displacement in radial direction relative to assembling fixture axis. EFFECT: simplified manufacturing of impeller and design of assembling fixture. 3 cl, 6 dwg