| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 99 === EMM (electrochemical micromachining) has the advantages of quick processing speed, no residual stress in surface, and nice smoothness in workpiece surface with enormous potentialities of highly added value. The electrode tool made by electrochemical machining has advantages of low cost, easy to production. Drilling by spiral tool can increase renew of the electrolyte, reduce the hole cut and taper off. So this study will analyze how to manufacture the spiral electrode tool.
The purpose of this thesis is to discuss the influences of various parameters on the production of a spiral microelectrode. Parameters including applied voltage, rotational rate of electrode, processing time, anode length, and electrode spacing.
The experimental results show that electrode rotation rate is the most important parameter. Since a spiral vortex flow can be formed as the tool rotates in a high speed rate, and thus destroying the viscous layer and etching formed on a spiral lines. With the applied voltage of 2V and rotational rate of 5000rpm, a micro spiral electrode with the thread depth up to 9.715μm, thread pitch is 153.103μm and diameter is 337.65μm,can be obtained with EMM.
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