A process for contour control machining of metal blocks

B - Operations – Transporting – 23 – Q

Patent

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Details

B23Q 35/02 (2006.01) B23P 15/02 (2006.01) G05B 19/19 (2006.01) G05B 19/4099 (2006.01)

Patent

CA 2407002

The invention comprises a computer aided program for milling machine to machine precise concave and convex surfaces within a metal block to form the base section of a turbine blade called the root section (1). The root section (1) of the turbine blade is designed to fit within precise tolerances upon a circular rotor. Because of the curvatures of the mating surface of the root section and the mating section of the circular rotor, the machining of the root section of the turbine blade requires convex movements of the form cutter tool (9) and rotating of the rotary table (7) which holds the turbine blades. The invention teaches a method of determing machining instructions for machining of a workpiece using a machine having a cutter (9), the surfaces of the workpiece being defined by a plurality of programmed instructions obtained by trigonometric analysis of the required surface curvatures.

La présente invention comprend un programme assisté par ordinateur destiné à une fraiseuse permettant d'usiner des surfaces concaves et convexes précises dans un bloc métallique de façon à fabriquer la base d'une aube de turbine appelée emplanture (1). Cette emplanture (1) de l'aube de turbine est conçue de façon à s'adapter selon des tolérances précises sur un rotor circulaire. Du fait de la courbure de la surface de contact de l'emplanture et de la section de contact du rotor circulaire, l'usinage de l'emplanture de l'aube de turbine nécessite des mouvements convexes de la fraise (9) de mise en forme et une rotation de la table rotative (7) qui maintient les aubes de la turbine. Cette invention propose un procédé de détermination d'instructions d'usinage permettant d'usiner une pièce avec une machine possédant une fraise (9), les surfaces de cette pièce étant définies par une pluralité d'instructions programmées par l'analyse trigonométrique des courbures de surface requises.

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