| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for forming a cooling hole in a workpiece and a turbine airfoil with hybrid-formed cooling holes. SOLUTION: This method includes the steps of laser-forming a blind, inwardly-tapering transition opening into a first side surface of the workpiece, and EDM-forming a generally cylindrical through-hole to a second, opposing side surface of the workpiece communicating with the inwardly-tapering transition opening to form a through cooling hole 14 communicating with the first and second side surfaces of the workpiece. An airfoil 10 having cooling holes formed by use of both of laser and EDM is also disclosed. COPYRIGHT: (C)2009,JPO&INPIT
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