公开(公告)号：US20240167423A1

公开(公告)日：2024-05-23

申请号：US17990343

申请日：2022-11-18

申请人： Collins Engine Nozzles, Inc.

发明人： Thomas J. Ocken ,  Murtuza Lokhandwalla ,  Mark J. Kelly ,  Andrew M. Caldecutt ,  Jerry Logsdon ,  Nathan DeVore ,  Joseph Samo

IPC分类号： F02C7/22 ,  B23H7/08 ,  B23H9/14

CPC分类号： F02C7/22 ,  B23H7/08 ,  B23H9/14 ,  F05D2220/323 ,  F05D2230/12 ,  F05D2260/607

摘要： A method of manufacturing a last chance screen for an aircraft engine includes forming an array of holes through a metal sheet with a wire electrode using electrical discharge machining. The array of holes comprises a plurality of holes. Each hole of the plurality of holes comprises a first end and a second end and is surrounded by a wall section such that the last chance screen is defined by the plurality of holes and the plurality of wall sections. The first and second end of each hole are widened by either applying a flow of an abrasive flow medium to the array of holes in two directions or using a conical sinker electrode on either side of the metal sheet. Shaping the first and second end of each hole results in an airfoil-shaped cross-section of each wall section.