Patent ID: 7225539

Claim:
Method for the manufacture of components composed of difficult-to-cut materials for gas turbines, especially for aircraft engines. by producing recesses with one or more side walls, in particular for manufacturing integrally bladed rotors for gas turbines, the recesses forming flow channels and the side walls forming blade surfaces, comprising the following steps: a) defining contours of said recesses by defining contours of at least one of said side-walls and said flow channels, b) removing material in the region of said flow channels by a drilling process, c) after the drilling process is finished, completing the removal of material in the region of said flow channels by a milling process, wherein the drilling process is performed in a way that a drilling tool removes material by drilling drill-holes in a flow wise direction of each flow channel, at least one of the size of the drill-holes, the pattern of the drill-holes and the axis of the drill-holes is determined from the defined contours of said recesses, and the axis of the drill-holes is approximately in parallel to the flow direction through the flow channel to be manufactured.