Method for producing hollow investment castings

Details Method for producing hollow investment castings Method for producing hollow investment castings

1993-03-29

1994-03-08

Cuda, Irene

Metal working

Method of mechanical manufacture

Impeller making

2988972, 1641221, B23P 1500

Patent

active

052916545

ABSTRACT:
A method for casting metering holes connecting the inner and outer surfaces of hollow investment cast objects, such as hollow air cooled gas turbine airfoils. The method incorporates mini cores having metering hole pins which extend further into the inner cavity than the surface of the cavity, so that the ends of the holes can be exposed by a subsequent machining operation. The method also includes forming a wax pattern which avoids contact between the wax and the metering hole pins so that the pins are not broken by the wax during the heatup portion of the wax removal step after formation of the ceramic casting mold.

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