F - Mech Eng,Light,Heat,Weapons – 01 – D
Patent
F - Mech Eng,Light,Heat,Weapons
01
D
26/148, 230/20,
F01D 25/00 (2006.01) B21K 1/36 (2006.01) B22D 25/00 (2006.01) B23P 15/00 (2006.01) F01D 5/34 (2006.01) F02C 7/00 (2006.01)
Patent
CA 1043266
METHOD OF MAKING A MOLD OR PATTERN OR CASTING FOR A TURBINE WHEEL OR A NOZZLE Abstxact of the Disclosure A method is presented for forming a rotatable tur- bine wheel or nozzle having one continuous and regular series of blades extending around its periphery with a uniform pitch between blades and in which all such blades are bent in one circumferential direction and adjacent blades overlap each other in a circumferential direction so that the wheel cannot be made in a simple two part mold separating at right angles to a parting line. The method comprises separately molding two wheel portions of the same diameter as the finished turbine wheel or nozzle, each having a series of continuous and regular blades around its periphery with a uniform pitch between the blades which is exactly twice the pitch of the blades in the finished wheel. In such a wheel portion the adjacent blades do not overlap each other. Two wheel portions are then assem- bled by placing the two wheel portlons together in such a mutual position that the blades of the two portions form the one continuous and regular series of blades which comprises the turbine wheel or nozzle. The turbine wheel or nozzle itself, made in such a manner, is also part of the invention.
276038
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