| Summary: | 碩士 === 國立中央大學 === 機械工程學系 === 102 === The demand for electronic products has been rapidly increasing. The general trend of size reduction and thinning increases the demand for enhanced precision of manufactured products not only in terms of dimension and shape, but also in the roughness quality of the machined surface. To avoid complex assembly and reduce structural rigidity due to miniaturized components, integrally molded parts have been adopted to improve the precision. The stainless steel is often adopted as a miniaturized structural part materials in order to keep strength and anti-wear. But the production speed about 10~20 μm/h is limited by using etching method. Present process mostly adopted chemical etching connected with stamping to fabricate but etching time is too long and machining shape is limited in two dimension.
This study presents two kinds of micro electrochemical machining processes to shorten the machining time and reduce the bottom corner radius of machined cavity. The high-precision electrode and fixtures is designed to fit the width specifications. The needed pattern and strip thickness of 20μm are removed by electrochemical machining. According to experimental results, the depth will increase with voltage and pulse-on time increasing, the bottom corner is getting smaller. The secondary processing method is better. The minimum radius of 0.094 mm is obtained as voltage of 11 V, pulse-on time of 70μs, pulse ratio of 50:50, electrode gap of 50μm, electrolyte pressure of 2 kg/cm2 and electrolyte concentration of 20 wt%.
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