公开(公告)号：EP2971539A4

公开(公告)日：2016-06-22

申请号：EP13866646

申请日：2013-12-06

Applicant: UNITED TECHNOLOGIES CORP

Inventor： KOONANKEIL JAMES M ,  PIETRASZKIEWICZ EDWARD F ,  SCHACHTNER KARL A ,  KLINEFELTER KEVIN J ,  FRITCH MARKUS W ,  DALEY JASON

IPC: F01D5/18 ,  B23H9/10 ,  B23H9/14 ,  F01D25/12 ,  F02C7/18

CPC classification number: B23H1/00 ,  B23H7/265 ,  B23H7/30 ,  B23H9/10 ,  F01D5/187 ,  F05D2230/12 ,  F05D2240/12 ,  F05D2240/81 ,  Y02T50/676 ,  Y10T29/49323 ,  Y10T29/49341

Abstract: A method of machining cooling holes in a component includes the steps of inserting an electro discharge machining guide that houses an electrode into an internal cavity of a component, and machining a cooling hole into a wall of the component with the electrode. A gas turbine engine component includes first and second spaced apart walls providing an internal cavity. The first wall has outer and inner surfaces. The inner surface faces the internal cavity. A cooling hole extends through the first wall from the inner surface to the outer surface. The cooling hole includes entry and exit openings respectively provided in the inner and outer surfaces. The exit opening includes a cross-sectional area that is smaller than a cross-sectional area of the entry opening.