Turbine blade machining method, machining tool, and turbine blade

Abstract

A turbine blade machining method and a machining tool, which allow efficient machining of a through-hole running from the surface of a turbine blade to the interior thereof, and a turbine blade. This turbine blade machining method, in which a through-hole is machined in a turbine blade with a protective film formed on a surface of a substrate, has: an insertion step of inserting a machining tool, including a grinding region provided at a tip thereof, into the through-hole with such an orientation that the grinding region faces the surface of the through-hole; and a removal step of grinding the protective film laminated in the through-hole with the grinding region of the machining tool inserted into the through-hole, to remove the protective film laminated in the through-hole.

1 . A machining tool, comprising:
 a tip portion provided with at least one grinding surface, a grinding region being formed thereon having diamond particles bonded to the grinding region; and   a support portion connected to one end of the tip portion, wherein   the grinding surface has a width becoming narrower toward a tip, the tip being an end on the opposite side to the end supported by the support portion.   
     
     
         2 . The machining tool according to  claim 1 , wherein a cross-section of the grinding surface has a linear shape, the cross-section being orthogonal to a direction connecting the end supported by the support portion and the tip. 
     
     
         3 . The machining tool according to  claim 1 , wherein a cross-section of the grinding surface has an inwardly-convex curved shape, the cross-section being orthogonal to a direction connecting the end supported by the support portion and the tip. 
     
     
         4 . The machining tool according to  claim 1 , further comprising an oscillating portion connected to the support portion, the oscillating portion, via the support portion, reciprocating the tip portion in a direction in which the end supported by the support portion and the tip are connected.