Method for machining a gas turbine rotor

摘要

The method involves concentrically rotating a set of cooling air grooves (19, 19') around an axis of a gas turbine rotor (10). Abrasive tools (22) i.e. milling tools, are lowered one after another in the cooling air grooves at an intermediate chamber between two bars. A slot base (16) of the cooling air grooves is processed over entire circumference so that the slot base is adjusted by a material removal in a breadth (b1, b2). The slot base is provided with a drop-shaped cross-sectioned contour including a bottle neck (20) that lies on the bars.