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http://dx.doi.org/10.5228/KSTP.2012.21.5.312

A Study on Performance Improvement of Electrical Discharge Machining for Producing Micro-holes Using a Shot Blasting Surface Treatment  

Jang, H.S. (서울과학기술대학교 산업대학원)
Kim, H.S. (서울과학기술대학교 기계.자동차공학과)
Shin, K.H. (서울과학기술대학교 기계.자동차공학과)
Publication Information
Transactions of Materials Processing / v.21, no.5, 2012 , pp. 312-318 More about this Journal
Abstract
With an increasing trend toward miniaturization, electrical discharge machining(EDM) has been receiving a lot of attention as a suitable production technology for micro-parts, since it enables the machining of hard conductive materials with a high degree of repeatability and without alteration to the material. When a micro-hole is fabricated by EDM, however, the diameter of the inlet hole is larger than that of the outlet region due to the additional discharge effect caused by the eroded particles. In this paper, a shot blasting surface treatment, in which an abrasive material is accelerated through a pressurized nozzle and directed at the surface of a part, is suggested as an effective method to reduce the tapered shape of EDM micro-hole. In addition, the influence of process parameters such as spark-on time and electrode diameter on the machining performance was investigated. It is shown quantitatively that the difference in diameter between the inlet and outlet holes decreases with the shot blasting treatment and with decreasing spark-on time.
Keywords
Shot Blasting; Micro-hole; Electrical Discharge Machining; Surface Treatment;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 S. Das, M. Klotz, F. Klocke, 2003, EDM Simulation: Finite Element-based Calculation of Deformation, Microstructure and Residual Stresses, J. Mater. Process. Technol., Vol. 142, No. 2, pp. 434-4512.   DOI
2 C. Diver, J. Atkinson, H. J. Helml, L. Li, 2004, Micro EDM Drilling of Tapered Holes for Industrial Applications, J. Mater. Process. Technol., Vol. 149, No. 1-3, pp. 296-303.   DOI
3 S. H. Lee, T. S. Jung, 2006, A Study on the Characteristics of Wire Electrical Discharge Machining of the High-hardened Mold Steel, Trans. Mater. Process., Vol. 15, No. 9, pp. 648-653.   DOI
4 K. H. Ho, S. T. Newman, 2003, State of the Art Electrical Discharge Machining (EDM), Int. J. Mach. Tools Manuf., Vol. 43, No. 13, pp. 1287-1300.   DOI
5 R. Cusanelli, M. Minello, F. Torchia, W. Ammann, P. E. Grize, 2007, Proc. 15th Int. Symposium Electromachining, University of Nebraska-Lincoln, Industrial & Management Systems Engineering, Pittsburgh, PA, pp. 241-245.
6 M. Kagawa, 1999, Study on Straight Micro Hole Machining by EDM using Stepped Electrode, J. JSPE, Vol. 65, No. 12, pp. 1793-1797.
7 D. J. Kim, S. M. Yi, Y. S. Lee, C. N. Chu, 2006, Straight Hole Micro EDM with a Cylindrical Tool using a Variable Capacitance Method Accompanied by Ultrasonic Vibration, J. Micromech. Microeng., Vol. 16, No. 5, pp. 1092-1097.   DOI
8 A. Fedoryszyn, P. Zyzak, 2010, Characteristics of the Outer Surface layer in Casts Subjected to Shot Blasting Treatment, Arch. Metall. Mater., Vol. 55, No. 3, pp. 813-818.