GAS TURBINE BLADE, AND TOOL FOR ELECTRICAL DISCHARGE MACHINING AND MACHINING METHOD OF THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a gas turbine blade including a diffusion film hole having superior cooling efficiency and machining efficiency regardless of a blade structure.SOLUTION: A gas turbine blade includes: a first blade surface positioned at a working fluid channel side exposed to working fluid; a second blade surface positioned at a cooling channel side through which a cooling medium circulates; and a plurality of film holes 10 communicating the first blade surface with the second blade surface. Each of the plurality of film holes has: an inlet 11 opened on the second blade surface; and an outlet 12 communicating the inlet with the first blade surface and in which a channel cross-sectional area expands toward the first blade surface, wherein the whole surface forming the outlet in the plurality of film holes is completely seen from one direction.