Elektro erozyon ile delik delmede işleme tamlığının deneysel incelenmesi

Öz

İşleme tamlığı, elektro erozyon ile delik delme işlemlerinin en önemli ölçütlerden birisidir ve bu olay aşırı elektrot aşınmalarından dolayı çok önemlidir. Bu çalışmada iş parçaları, kör delikler elde edebilmek için elektro erozyon parametrelerine bağlı olarak işlenmiştir. İşleme tamlığı deneysel olarak işleme derinliği ve deliklerin şekillerine bağlı analiz edilmiştir. Deneysel sonuçlar varyans analizi ve regresyon analizi gibi istatistiksel metotlar ile değerlendirilmiştir. Ek olarak, işleme tamlığını geliştirmek ve en uygun işleme şartlarını belirlemek için grey ilişki analizi kullanılmıştır. Çalışma akımının belirleyici parametre olduğu gözlemlenmiştir. Malzemelerin elektro erozyon ile delme işlemlerinde daha doğru delik şekli elde edebilmek için daha düşük çalışma akımı ve daha yüksek vurum süresi tavsiye edilmiştir.

Anahtar Kelimeler

• İşleme tamlığı,Elektro erozyon ile delik delme,Grey ilişki analizi

Experimental investigation of machining accuracy in electrical discharge drilling

Abstract

Machining accuracy is one of the most important criteria of electro discharge drilling (EDD) processes and this phenomenon is serious due to excessive electrode wears. In this study, the workpieces were machined with regard to EDD parameters to obtain blind holes. The machining accuracy was analyzed experimentally based on machining depth and shape of the holes. Experimental results were assessed by statistical methods such as analysis of variance and regression analysis. In addition, grey relation analysis was used to determine optimal machining condition and to improve the machining accuracy. It has been observed that working current is the determinative parameter. The lower working current and the higher pulse time are suggested to obtain the more accurate shape of the drilled holes in EDD of materials.

Keywords

• Machining accuracy,Electrical discharge drilling,Grey relation analysis

References

1. Rajurkar KP. Nontraditional Manufacturing Processes. Editors: Dorf RC, Kusiak A. Handbook of Design Manufacturing and Automation, 211-241, Hoboken, New Jersey, USA, John Wiley & Sons, Inc., 1994.
2. Rajurkar KP, Levy G, Malshe A, Sundaram MM, McGeough J, Hu X, Resnick R, DeSilva A. “Micro and nano machining by electro-physical and chemical processes”. CIRP Annals – Manufacturing Technology, 5582), 643-666, 2006.
3. Sundaram MM, Rajurkar KP. “Towards freeform machining by micro electro discharge machining process”. Transactions of the North American Manufacturing Research Institute of SME, 36, 381-388, 2008.
4. Yildiz Y, Sundaram MM, Rajurkar KP. “Statistical analysis and optimization study on the machinability of beryllium-copper alloy in electro discharge machining”. Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture, 226(11), 1847-1861, 2012.
5. Ji R, Liu Y, Zhang Y, Wang F, Cai B, Dong X. “Machining performance optimization in end ed milling and mechanical grinding compound process”. Materials and Manufacturing Processes, 27(2), 221-228, 2012.
6. Ozgedik A, Cogun C. “An experimental investigation of tool wear in electric discharge machining”. International Journal of Advanced Manufacturing Technology, 27(5-6), 488-500, 2006.
7. Pham DT, Ivanov A, Bigot S, Popov K, Dimov S. “An investigation of tube and rod electrode wear in micro EDM drilling”. International Journal of Advanced Manufacturing Technology, 33(1-2), 103-109, 2007.
8. Jeong YH, Min BK. “Geometry prediction of EDM-drilled holes and tool electrode shapes of micro-EDM process using simulation”. International Journal of Machine Tools and Manufacture, 47, 1817-1826, 2007.

9. Opoz TT, Ekmekci B, Erden A. “An experimental study on the geometry of microholes in microelectric discharge machining”. Materials and Manufacturing Processes, 24(12), 1236-1241, 2009.
10. Yan MT, Huang KY, Lo CY. “A study on electrode wear sensing and compensation in Micro-EDM using machine vision system”. International Journal of Advanced Manufacturing Technology, 42, 1065-1073, 2009.
11. Yan MT, Lin SS. “Process planning and electrode wear compensation for 3D micro-EDM”. International Journal of Advanced Manufacturing Technology, 53(1-4), 209-219, 2011.
12. Nguyen MD, Wong YS, Rahman M. “Profile error compensation in high precision 3D micro-EDM milling”. Precision Engineering, 37(2), 399-407, 2013.
13. Yildiz Y, Sundaram MM, Rajurkar KP. “Empirical modeling of the white layer thickness formed in electrodischarge drilling of beryllium-copper alloys”. International Journal of Advanced Manufacturing Technology, 66(9-12), 1745-1755, 2013.
14. Deng JL. “Introduction to grey system theory”. Journal of Grey System, 1(1), 1-24, 1989.