| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of working a TBC without closing film cooling holes by a simple method in a turbine blade having the TBC and a large number of film cooling holes. <P>SOLUTION: A method of working a film cooling hole which communicates with an internal cooling passage of a turbine blade from an outer surface, in the turbine blade which has a heat shield coating and the internal cooling passage includes: (1) a step of executing a bond coat on a blade base material; (2) a step of piercing a cooling hole in accordance with an electric discharge machining; (3) a step of executing a top coat; and (4) a step of removing the top coat in accordance with a mechanical method with respect to a band-like region including a row of cooling holes, by using a blasting method, a water jet method or the like. Accordingly, the blade using both the highly reliable film cooling system and the TBC can be easily worked, wherein any occlusion of the cooling hole or any damage of the TBC due to the piercing hardly occurs. <P>COPYRIGHT: (C)2012,JPO&INPIT |
