A new technique for the fabrication of graphite EDM electrodes

Traditional processes for machining mould cavities are lengthy and costly. Electro-discharge machining (EDM) is the most commonly used technique to obtain complex mould cavities. However, some electrodes are difficult to fabricate because of the complexity. Applying rapid prototyping (RP) technology to fabricate an abrading tool which is used to abrade graphite EDM electrodes, the cost and cycle-time can greatly be reduced. The paper describes the work being conducted in this area by the authors. This technique will find widespread applications in rapid steel mould manufacturing.