Side-Insulation of Tool Electrode and Application in Micro ECM
This paper presented a new side-insulation approach for micro electrodes in micro ECM, in which spin-coating and room curing are used to coat the micro tool electrodes with a very thin film of polymer, followed by an end-rubbing process to remove the insulation material from the electrode end surfaces. Processing parameters of spin-coating were optimized experimentally, and side-insulated micro electrodes with a five-layer epoxy coating of 5~ 10 μm thickness were prepared. Experiments were made to test the effect of side-insulated electrode in micro hole Machining. And the results demonstrated that the side-insulated electrode used as tool electrode can significantly reduce the hole diameter and taper and improve the machining accuracy.
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