Study of Electrical Discharge Machining by a large scale

• Main Authors: Hsu-Shih hsun, 許世勳
• Other Authors: Piin-Hwa Yan
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/09870544496123157505

碩士 === 國立中央大學 === 機械工程研究所碩士在職專班 === 100 === Due to EDM have low working speed defect,working debris weren’t easily flushed and also debris deposit between electrode and work. In order to solve this problem, We propose three solutions .First ,We add aluminum powder in the working fluid can increase the gap distance between the electrode and workpiece and wastes bits can become small quality .Second , Add the magnetic field on both sides of the workpiece, increasing processing speed of debris flow. Third, while increasing the magnetic field and adding aluminum powder in the EDM, to enhance the material removal rate. From the experiment results, The use of better methods of processing parameters and no improvement of the workpiece surface will have a processing chip accumulation phenomenon. 30min after processing, electrode diameter, 30mm, 40mm, 55mm material removal rates were 0.70g/min, 0.69g/min, 0.20g/min;The first Techniques experiment results, Add aluminum material removal rates were 0.82g/min, 0.77g/min, 0.72g/min, and the workpiece surface did not chip accumulation phenomenon; Magnetic field-assisted material removal rates were 0.96g/min, 0.83g/min, 0.70g/min, and the workpiece surface did not chip accumulation phenomenon; Add aluminum powder processed with the magnetic field-assisted material removal rates were 1g/min, 0.93g/min, 0.76g/min, and the workpiece surface did not chip accumulation phenomenon. Three kinds of improvements can make the process smooth chip flow and enhance the material removal rate. Add aluminum powder and add magnet while the best results after processing