关键词: 涡轮导向叶片, 封严槽, 电火花, 基准系统, 弹性定位, 快换工装

Abstract: The turbine guide vane is a key component in an aero-engine that withstands high temperatures and thermal shocks. It is usually assembled in the engine as an integral disk. Seal plates are used for sealed connection between the side surfaces of adjacent vane platforms to reduce cold air loss between the side surfaces of the guide vanes. These seal plates are installed in the seal grooves of the vane platforms,and Electrical Discharge Machining (EDM) is generally adopted for machining these seal grooves.However,due to the diverse structures of the seal grooves and the low precision of the vane blank datums, EDM faces great difficulties and low efficiency in machining. To address this problem,by analyzing the structure of the seal grooves of turbine guide vanes and the characteristics of EDM,research was conducted on the design technologies of EDM tooling such as fixtures,electrodes and electrode chucks for precise and efficient machining. A tooling scheme for EDM of the seal grooves of turbine guide vanes was proposed,which ensures the shape and position accuracy of the seal grooves and realizes efficient EDM of the seal grooves of turbine guide vanes.

Key words: turbine guide vane, sealing groove, spark, reference system, elastic positioning, fast exchange tooling