Investment casting method

Details Investment casting method Investment casting method

B - Operations, Transporting

22

C

22/166

B22C 9/22 (2006.01) B22C 9/04 (2006.01)

Patent

CA 1090087

INVESTMENT CASTING METHOD ABSTRACT OF THE DISCLOSURE The specification discloses a method of manufacturing a propeller or other large casting wherein a pattern coated with a ceramic shell defining an investment mold is removed from the shell in two stages. In the first stage a sufficient amount of the material constituting the pattern is removed by the vapour of a solvent for the material to produce a small gap between the pattern and the shell. In the second stage, heat is applied to remove the rest of the pattern. Because of the gap produced in the first stage, stress on, and cracking of, portions of the shell due to expansion of the pattern are avoided in the second stage and there is thereby produced a shell mold permitting production of a casting such as a pro- peller having good surface finish and precise dimensions.

282385

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