Method for machining a workpiece having an irregular edge

Abstract

A method for machining a workpiece is provided. An electrode is moved linearly in the direction of the workpiece to cause material to be removed from the workpiece, at least one end of a surface of the workpiece running obliquely to a guide edge of the electrode machining this surface. The electrode is moved at least partially with the electrode surface parallel to the surface, so that during the approach to the workpiece, areas of the workpiece having an irregular edge machined at a different intensity are formed, the difference in intensity of machining on the edge of the surface to be machined being compensated in that the surface to be machined is provided with a height profile adapted to the shape of the end of the surface to be machined. A blade ring segment and blade ring is also disclosed.

What is claimed is: 
     
         1 . A method for machining a workpiece, an electrode being situated at a distance from a workpiece to be machined and moved linearly in the direction of the workpiece to be machined to cause material to be removed from the workpiece during the approach to the workpiece, at least one end or one section of one end of a surface of the workpiece to be machined running obliquely to a guide edge of the electrode machining this surface, the method comprising:
 moving the electrode at least partially with the electrode surface parallel to the surface to be machined, so that during an approach of the electrode to the workpiece, areas of the workpiece having an irregular edge machined at a different intensity are formed, the difference in intensity of machining on the edge of the surface to be machined being compensated in that the surface to be machined is provided with a height profile adapted to the shape of the end of the surface to be machined.   
     
     
         2 . The method as recited in  claim 1  wherein the height profile, in areas in which the end of the surface to be machined protrudes in the opposite direction from the direction of movement component parallel to the surface, and is passed by the guide edge of the electrode first, a lesser material removal and thus an elevated profile is provided than in areas in which the end of the surface to be machined is recessed in the direction of the direction of movement component parallel to the surface and is passed by the guide edge of the electrode at a later point in time and therefore a lowered profile is provided. 
     
     
         3 . The method as recited in  claim 1  wherein the machining includes electrochemical machining (ECM), erosion, electrodischarge machining (EDM) or electrochemical discharge machining (ECDM). 
     
     
         4 . The method as recited in  claim 1  wherein workpiece includes blade ring segments of a blade ring having an outer and/or inner shroud, and the machining of the blade ring segments is used to adjust the boundary edges of adjacent blade ring segments to one another. 
     
     
         5 . The method as recited in  claim 4  wherein the electrode is moved with at least one movement component across a Z-shaped edge of one of the outer and inner shrouds in the circumferential direction of the blade ring, so that the one shroud receives a height profile having peaks and/or valleys running in the circumferential direction, the peaks being provided in the area of the sections of the end of the one shroud protruding in the circumferential direction, and the valleys being provided in areas of the sections of the end of the one shroud recessed in the circumferential direction.