METHOD FOR FORMING COOLING HOLES HAVING SEPARATE COMPLEX AND SIMPLE GEOMETRY SECTIONS

摘要

A gas turbine part with a cooling hole, is fabricated by first forming a model of a wall of a gas turbine part. The wall is defined by first and second surfaces (104, 106), the first surface (104) having an aperture indentation (108) possessing a complex geometry and extending into but not all the way through the wall of the gas turbine part. A mold (110, 114) of the wall of the gas turbine part is formed using the model and is used to cast the wall of the gas turbine part by lost-material casting. A passage (120) is drilled through the resulting casting. This passage (120) extends from the aperture indentation (108) in the first surface (104) through to the second surface (106).