Fans and turbines

B - Operations – Transporting – 23 – H

Patent

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Details

B23H 9/10 (2006.01) B23H 1/04 (2006.01)

Patent

CA 2579690

Overlapping twisted radial aerofoil blades or vanes are formed on a compressor rotor or turbine disk or the like (102) by electro-discharge machining with a curved tool electrode which is in the form of an elongate and substantially rigid element other than a wire (150) which is turned by a tool holder (130) as it is advanced on a helical path to form the inner surface of each blade or vane with the outer curve of the electrode, or the outer surface of each blade or vane with the inner curve of the electrode, the disk being indexed to a next rotary position after each blade surface is machined.

Selon l'invention, des aubes ou pales aérodynamiques radiales courbées et en chevauchement sont formées sur un rotor de compresseur ou un disque de turbine ou analogue (102) par usinage par électro-érosion à l'aide d'une électrode d'outil courbé sous forme d'élément allongé et sensiblement rigide autre qu'un câble (150) mis en rotation par un porte-outil (130) à mesure qu'il est avancé sur un chemin hélicoïdal pour former la surface intérieure de chaque aube ou pale avec la courbure extérieure de l'électrode, ou la surface extérieure de chaque aube ou pale avec la courbure intérieure de l'électrode, le disque étant indexé sur une position rotative suivante après usinage de chaque aube.

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