MANUFACTURING METHOD OF TURBINE CASING

摘要

PROBLEM TO BE SOLVED: To resolve a problem in molten metal for cast steel where a molten metal flow is poor and it is difficult to manufacture cooling holes by holes as cast. SOLUTION: The molten metal is cast in a mold molded so that a plurality of axially extending grooves are formed in an outer circumferential part of the turbine casing after casting. After solidification of the molten metal, the turbine casing which is a casting is taken out of the mold. The cooling holes are formed by covering the grooves formed in the outer circumferential part of the turbine casing after casting by lids and welding the lids and the turbine casing outer circumferential part.