Metal founding – Process – Shaping a forming surface
Patent
1977-07-25
1979-02-13
Lazarus, Richard B.
Metal founding
Process
Shaping a forming surface
164246, 164249, B22C 702
Patent
active
041390466
ABSTRACT:
A method is presented to make an investment casting pattern of a rotatable turbine wheel or a stationary turbine nozzle wheel 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 pattern cannot be made in a simple two part mold separating at right angles to a parting line. The method comprises separately forming two wheel pattern portions of the same diameter as the finished turbine wheel pattern, 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 pattern. In such a pattern wheel portion the adjacent blades do not overlap each other. Two such pattern wheel portions are then assembled so that the blades of the two portions form the one continuous and regular series of blades which comprises the pattern of the complete turbine wheel.
REFERENCES:
patent: 3041689 (1962-07-01), Peras
patent: 3669177 (1972-06-01), Ingalls et al.
patent: 3848654 (1974-11-01), Boyle et al.
Lazarus Richard B.
McQuade John
Tempcraft Tool & Mold Inc.
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