Wednesday, August 27, 2008

Electrical discharge machining (EDM)

Electrical discharge machining (EDM) is a non-conventional process of machining. the development of the EDM technology started in the forties. Since then, it is the most important machining process in tool engineering. General advantages to other machining processes are: accuracy, surface quality and the fact that hardness and stiffness of a workpiece material is not important for the material removal. The EDM has become mature technology but the researches and improvements of the process are still going on. The main reason why, is that there still does not exist a machining process, which could successfully replace the EDM.

Crater to pulse classification

By research on basic principles for material removal in EDM process we try to improve effectiveness of the process. A single discharge - an unit event of EDM process was researched (Fig. 1). The correlation between electrical parameters and surface give us important information about process.

Figure: Time dependence and surface crater of single discharge made by EDM machining

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