Please use this identifier to cite or link to this item:
https://scholarbank.nus.edu.sg/handle/10635/16491
DC Field | Value | |
---|---|---|
dc.title | MICRO-EDM-BASED MULTI-PROCESS MACHINING OF TUNGSTEN CARBIDE | |
dc.contributor.author | MUHAMMAD PERVEJ JAHAN | |
dc.date.accessioned | 2010-04-08T11:05:32Z | |
dc.date.available | 2010-04-08T11:05:32Z | |
dc.date.issued | 2009-07-31 | |
dc.identifier.citation | MUHAMMAD PERVEJ JAHAN (2009-07-31). MICRO-EDM-BASED MULTI-PROCESS MACHINING OF TUNGSTEN CARBIDE. ScholarBank@NUS Repository. | |
dc.identifier.uri | http://scholarbank.nus.edu.sg/handle/10635/16491 | |
dc.description.abstract | This study aims to develop micro-EDM-based multi-processes for the machining of difficult-to-cut tungsten carbide (WC). In the first phase of this study, investigation has been carried out on the machinability of WC in micro-EDM and improvement of the micro-EDM system by comparing the performance of existing transistor-type pulse generator with the newly developed RC-type pulse generator It is found that WC has better machinability in micro-EDM and RC-type pulse generator is more suitable for fabricating micro-structures in WC.In the second phase, a low-frequency vibration device has been developed and both analytical and experimental investigations have been carried out on the mechanism and performance of vibration-assisted micro-EDM for deep-hole drilling in WC. A significant improvement in the machining performance as well as quality, accuracy and aspect ratio of micro-holes was observed. In addition, high-aspect-ratio microelectrodes were fabricated on-machine using Turning-B5EDM hybrid process and Block-B5EDM process to apply in deep-hole drilling of WC using vibration-assisted micro-EDM.In the last phase, investigation has been carried out to improve the quality and integrity of the surface finish of WC using newly developed milling micro-EDM and nanopowder mixed dielectric. An analytical and experimental investigation has also been carried out on powder-mixed micro-EDM of WC. It is found that milling micro-EDM provides smoother and defect free nanosurfaces with higher MRR and lower EWR compared to conventional sinking micro-EDM. Moreover, powder mixed micro-EDM with conductive or semi-conductive particles in the dielectric can enhance the surface finish to a great extent in addition to improving the overall performance. Finally, the integration of multiple processes with micro-EDM has greatly enhanced the performance by minimizing the problems with performance issues of micro-EDM alone. | |
dc.language.iso | en | |
dc.subject | Micro-EDM, Multi-process machining, Tungsten carbide, Vibration-assisted micro-EDM, Fine-finish micro-EDM, Powder-mixed micro-EDM | |
dc.type | Thesis | |
dc.contributor.department | MECHANICAL ENGINEERING | |
dc.contributor.supervisor | RAHMAN, MUSTAFIZUR | |
dc.contributor.supervisor | WONG YOKE SAN | |
dc.description.degree | Ph.D | |
dc.description.degreeconferred | DOCTOR OF PHILOSOPHY | |
dc.identifier.isiut | NOT_IN_WOS | |
Appears in Collections: | Ph.D Theses (Open) |
Show simple item record
Files in This Item:
File | Description | Size | Format | Access Settings | Version | |
---|---|---|---|---|---|---|
PhD Thesis_Muhammad Pervej Jahan.pdf | 9.83 MB | Adobe PDF | OPEN | None | View/Download |
Google ScholarTM
Check
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.