Assessment of vibration-assisted micro-EDM dressing process-stability by monitoring and analyzing debris evacuation during Ti-6Al-7Nb machining
| Autor: | Probir Saha, Shamim Shah |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0209 industrial biotechnology
Materials science Strategy and Management Process (computing) 02 engineering and technology Surface finish Management Science and Operations Research 021001 nanoscience & nanotechnology Debris Stability (probability) Industrial and Manufacturing Engineering Vibration Electric arc 020901 industrial engineering & automation Machining Surface roughness Composite material 0210 nano-technology |
| Zdroj: | Journal of Manufacturing Processes. 66:250-268 |
| ISSN: | 1526-6125 |
| Popis: | Despite several benefits, the micro-EDM dressing has not achieved widespread acceptance in the micro-fabrication industries due to its low process-stability, which resulted in low material removal rate ( M R R ), surface finish, and dimensional accuracy. The vibration of the tool-plate showed significant improvements in this regard. Additionally, understanding the process-stability of micro-EDM dressing under vibration in terms of debris evacuation in real-time will surely help to utilize the process better, which lacks recognition to date. In this regard, the present work used a high-speed camera and image processing technique to monitor and analyze the debris evacuation while machining an emerging Ti-6Al-7Nb biomedical material. The process-stability was assessed by the percentage of normal and arcing pulses, and the average workpiece retraction height was monitored in real-time. Furthermore, the stability results were used to explain its performance measures, mainly M R R , area surface roughness ( S a ) and dimensional accuracy. The experimental results showed an increased debris number (∼ 3–38 times) and average velocity (∼ 1.3–2.2 times) in the focused window under the tool-plate vibration compared to no vibration. The results also showed an increased percentage of normal pulses (∼ 1.1 times) and a decreased average workpiece retraction height (∼ 1.5 times) with an increased vibration amplitude from 0.65 ( a 1 ) to 4.41 μm ( a 5 ) , which were also as per the debris evacuation results. However, despite having a higher average debris velocity, the higher vibration frequency didn’t offer a superior inter-electrode gap condition, as verified through the stability results. The process’s performance results under different vibration frequencies were also found as per the stability results. |
| Databáze: | OpenAIRE |
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