| Summary: | 碩士 === 國立臺灣師範大學 === 工業教育學系 === 104 === The study tested electric discharging machining parameters influence the machining characteristics of aluminum alloy 6061. With copper as the electrode, Fixed pulse time, Slag height, discharge voltage, and change discharge current 8 A~15A. To investigate EDM features including electrode consumption rate, material removal rate, surface roughness, recastlayer and fatigue life. In order to monitor the quality of the discharge process in control, the optimal discharge machining parameters repeated experiments (35 times) , observed an aluminum alloy (6061) discharge machining characteristics, with quality control charts, to monitor the predicted effect.
The results showed a high discharge current (15A) with a larger material removal rate, electrode consumption rate, surface roughness and surface hardness. In addition, increasing the discharge current, recastlayer thickness also increases (from the 10.31 μm to 19.38 μm), due to affected layer hardness is much higher than the base material, so the fatigue life rise with the workpiece.
After repeated (35 times) discharge machining experiments, through quality control charts (Shewhart control chart) monitor the discharge machining characteristics remain in a stable state.
Moreover, the application of plasma etching the surface discharge machining, in further, enhance fatigue life of electrical discharge machining parts.,Investigated plasma etch parameters: etching power (W), oxygen flow rate (sccm), etching time (min) for the influence of electrical discharge machining surface roughness, water contact angle and fatigue life. With scanning electron microscope (SEM), observe the surface morphology and recastlayer.
The experimental result shows that the EDMed workpiece by plasma etching, remove surface residue and micro-cracks effectively, reducing the adverse effects of micro-cracks, the fatigue life of EDMed workpiece can be improved.
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