Manufacturing of graphite electrodes with high geometrical requirements

摘要

Graphite is widely used for the die-sinking electrical discharge machining (EDM) process, especially for the roughing process. For the manufacturing of graphite electrodes the milling process is mainly used. The process enables fast processing times t_P and high geometrical flexibility. In consequence of the cutting behaviour of graphite micro-components with geometrical features can be manufactured. In this contribution the manufacturing of micro-pins and bridges with aspect ratios of A = 1:50 were machined with diamond coated milling tools. By variation of the depth of cut a_p and the width of cut a_e it can be shown that the influence of the depth of cut a_p is quite bigger than the influence of the width of cut a_e. This results in consequence of the higher stability of the geometrical features by improved force distribution.