Electro-discharge machining method and device for machining workpieces by controlled crater formation

摘要

An EDM method and device, the surface roughness of the machined workpiece (1) being reduced or the ratio of the material removal rate to the surface roughness being increased, in that the flow rate of the fluid machining medium through the discharge gap (4), and/or the relative movement rate between the tool electrode (2) and the workpiece (1) along the machining boundary surface are controlled such that each individual discharge crater on the surface of the workpiece (1) is of an elliptical shape having a major axis which is at least twice as long as its minor axis. IMAGE