| 摘要 |
PURPOSE: A forming method of drilled holes and backer inserts are provided to protect a structure adjacent to a structure to be drilled, from water jet by blocking drilling water jet the moment holes are completed and to prevent breakage of an airfoil structure. CONSTITUTION: A method of forming drilled holes in a wall of a component(10) having hollow interior cavities(18, 20) comprises steps of disposing backer inserts(12, 14) comprising a water jet blocking material in the hollow interior cavity adjacent to a back surface of the wall to be drilled; performing water jet drilling(22, 24) of at least one hole into the wall through to the hollow interior cavity; and removing the backer insert. The backer insert is one of formed from and coated with the blocking material. The blocking material is more resistant to water jet drilling forces than a material of the wall.
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