Monday, September 15, 2008

Graphite and CFRP machining

High speed machining is common practice in many workshops generating electrodes through high speed, which are then used in SEDM. Cutting speeds are so as high as the machine can, using very high speed spindles (40.000 rpm) although with little power.

Graphite is very soft (he’s the pencil mogul) yet its character is abrasive thus we recommend using diamond coated tools achieving a very high duratioon. Another problem is the dust generated and must be aspirated effectively (specially problematic in CFRP, carbon fibber reinforced plastics), otherwise one can infilter CNC, and other electrical elements causing short-circuits. Plus he has an abrasive effect which can lead to damage of the machine carriage.



Fig.(Left.) High speed milling of a graphite electrode. (Right.) Image of same. Centre Detail of introduction in an electroerosion machine.

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