Improvement of machining performance for steel grade 760 using magnetic field assisted Al2O3 powder-mixed EDM /
Electrical Discharge Machining (EDM) is one of unconventional machining process that attracts people in mould making industries because of its numerous advantages. However, debris clogged in the machining gap affect EDM performance. Recent research agreed that EDM with the assistance of magnetic fie...
Saved in:
| Main Author: | |
|---|---|
| Format: | Thesis |
| Language: | English |
| Published: |
Gombak, Selangor :
Kulliyyah of Engineering, International Islamic University Malaysia,
2016
|
| Subjects: | |
| Online Access: | http://studentrepo.iium.edu.my/handle/123456789/4883 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Electrical Discharge Machining (EDM) is one of unconventional machining process that attracts people in mould making industries because of its numerous advantages. However, debris clogged in the machining gap affect EDM performance. Recent research agreed that EDM with the assistance of magnetic field could counter the debris clogged problem and powder-mixed EDM (PMEDM) has also proved to improve the surface qualities of the workpiece. Therefore, this research combined those two EDM-based hybrid machining together, which is known as magnetic field assisted PMEDM. It used Aluminium Oxide (Al2O3) as the powder mixed in the dielectric fluid of EDM and permanent cylindrical-type magnet to have the magnetic field influences. Steel grade 760 used as the workpiece as it is one of the common steel used in mould cavity making and copper used as the electrode. Three input parameters which are peak current (Ip), pulse on-time (Ton), and powder concentration (Pconc) was selected. Two level approach of Full Factorial Design of Experiment (DOE) was applied to design the experiment and the data was analyzed by using ANOVA analysis and the optimal combinations of the process parameters were predicted. The experimental results and the developed mathematical models indicate that the input process parameters affect the responses, and peak current is the most significant factor. It was found that the application of cylindrical magnet contributed to higher machining performance of PMEDM in terms of material removal rate, tool wear rate, surface roughness and surface hardness. The multi optimization of the experimental results consider all responses to have the same importance shows that the MRR improves up to 14.89% when the magnetic field is applied while TWR did not have significance difference. The surfaces of the workpiece can get 13.128% smoother and 9.804% harder when magnetic field assisting the PMEDM process compared to PMEDM with no magnetic field applied |
|---|---|
| Physical Description: | xv, 95 leaves : ill. ; 30cm. |
| Bibliography: | Includes bibliographical references (leaves 90-94). |