| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 99 === Most of the general discharge machining process using solid electrodes. The use of sintered porous electrode is less. The experimental by three different titanium-based electrodes (including solid and porous). Adjust the current size and the impact factor of aluminum alloy EDM experiment. Discuss aluminum through the different electrodes, electric current and impact factor after EDM processing characteristics, Surface with cross-section elemental analysis, Cross-section hardness and other characteristics. We hope that changes various parameters to have quickly remove material. And in the processing process, to the surface alloying, produces a modified layer.
The results indicate that using TiN electrode caused material removal rate, electrode wear rate and surface roughness are the largest, Ti (25% TiN) electrodes are the second, Ti (6Al4V) electrode is the lowest. By EDS analysis, With the TiN electrode EDM workpiece surface and the workpiece cross-section of Ti element content are the largest, Ti (25% TiN) electrodes are the second, Ti (6Al4V) electrode is the lowest. Analyzed by the XRD diffraction, The three kinds of electrode EDM workpiece surface have aluminum carbide (AlC) and titanium carbide (TiC) compound ingredients. Finally, Do the cross-section micro-hardness measurements. Compare porous and solid electrodes on the surface modification effect. Porous titanium-based electrodes that can be processed aluminum alloy are more surface modification effects. Surface and cross-sectional have more elements of Ti content. Aluminum surface can improve the characteristics of the micro-hardness.
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