Electro-discharge machining (EDM) is a manufacturing process in which material is removed by electrical discharges between the electrode and the workpiece. This allows for the desired shape to be obtained even for high aspect ratios. EDM is therefore particularly suitable for the production of complex and highly accurate internal geometries or shaped cooling air holes.
When restoring the tips of repaired high-pressure turbine blades, the process is used to produce the internal tip geometry and to open up cooling air holes plugged by welding. MTU boasts an adaptive and fully automated EDM facility which can accommodate several blades, which are processed one after the other with the aid of a robot-controlled system. Optimum machining parameters are ensured by special control software.