| URN | etd-0117112-171741 | Statistics | This thesis had been viewed 812 times. Download 8 times. |
| Author | Wei-Jen Cheng | ||
| Author's Email Address | No Public. | ||
| Department | Institute of Mechatronic Engineering | ||
| Year | 2011 | Semester | 1 |
| Degree | Master | Type of Document | Master's Thesis |
| Language | zh-TW.Big5 Chinese | Page Count | 121 |
| Title | Electrical Discharge Machining of Aluminum Alloy using Sintered Titanium Electrodes | ||
| Keyword | |||
| Abstract | This study conducted electrical discharge machining (EDM) of aluminum alloy using sintered titanium electrodes with specimens submerged in kerosene. The effect of machining parameters including polarity, peak current, pulse duration and pulse-off time on material removal rate and electrode wear ratio were explored. In addition, electrical discharge machined surface was examined to understand the effect of mode of kerosene supply and additives in aluminum alloy on the formation of thin film during the EDM process. Surface roughness was measured, compositional phase analysis was performed using XRD, and surface morphology was observed by SEM. Experimental results showed that EDM using sintered titanium electrodes of positive polarity achieved good material removal rate; while EDM using electrodes of negative polarity caused deposition, resulting in thin film formed on the material surface. The formation rate of thin film was influenced by both peak current and pulse duration. Moreover, carbon debris and other materials were more efficiently removed during EDM with rotating electrodes and in kerosene supplied in a jet flow with Nitrogen added. However, to avoid thin film formation, both the electrode rotational speed and flow speed of Nitrogen should be reduced; and the specimens had to be submerged in kerosene during EDM. Better machining results were obtained using sintered titanium electrodes with 80% density. TiN or CNTi thin film would be formed on the surface of the aluminum alloy specimen by EDM using sintered titanium electrodes of negative polarity with 80% density, peak current of smaller than 8A, pulse duration of 9-100 £gs, impact ratio of 27%. Furthermore, by adding TiN powder to the kerosene, surface roughness can be enhanced by 12% when using electrodes with negative polarity and 25% when using electrodes with positive polarity. |
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| Advisor Committee | |||
| Files | indicate in-campus access at 3 years and off-campus access at 3 years | ||
| Date of Defense | 2012-01-09 | Date of Submission | 2012-01-18 |