ELEKTRO EROZYON İLE İŞLEMEDE TOZ KARIŞIMLI DİELEKTRİĞİN PERFORMANS ÜZERİNE ETKİLERİ

Bu çalışmada, elektro erozyon ile işlemede (EEİ) metal tozu karışımlı dielektrik sıvı kullanımında işparçası yüzey pürüzlülüğü, işparçası işleme hızı, elektrot aşınma hızı, bağıl aşınma, işparçası yüzey sertliği ve mikroyapısı gibi performans çıktılarının işleme parametreleri ile gösterdiği değişim deneysel olarak incelenmiştir. Bu amaçla prizmatik çelik işparçası, prizmatik bakır elektrot, borik asit (H3BO) ve grafit tozları katılmış gazyağı dielektrik kullanılarak değişik toz konsantrasyonları ve vurum süreleri için işleme deneyleri yapılmıştır. Yapılan deneyler, vurum süresinin ve dielektrik sıvıya karıştırılan tozların ve konsantrasyonlarının EEİ yönteminin performans çıktıları üzerinde etkili olduğu göstermiştir

Anahtar Kelimeler:

elektro erozyon ile işleme, toz karışımlı dielektrik sıvı, yüzey pürüzlülüğü, işleme hızı, elektrot aşınması, yüzey sertliği, mikro yapı

EFFECT OF POWDER MIXED DIELECTRIC ON MACHINING PERFORMANCE IN ELECTRIC DISCHARGE MACHINING (EDM)

ABSTRACTIn this study, the variations of machining performance outputs, namely, workpiece surface roughness, workpiece removal rate, electrode wear rate, relative wear, workpiece surface hardness, and workpiece surface microstructure were experimentally investigated with the varying machining parameters for metal powder mixed dielectric liquid in electrical discharge machining (EDM). The machining tests were conducted by using prismatic steel workpiece and copper electrodes with graphite and boric acid powders (H3BO3) mixed kerosene dielectric at different powder concentrations and pulse time settings. The experiments have shown that the type and concentration of the powders mixed into the dielectric and the pulse time were effective on machining performance outputs in EDM.

Keywords:

Key Words: electric discharge machining, powder mixed dielectric, surface roughness, machining rate, electrode wear, surface hardness, micro structure,

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Chow, H.M., Yan, B.H., Huang, F.Y., Hung, J.C., “Study of added powder in kerosene for the micro-slit machining of titanium alloy using electro-discharge machining”, Journal of Materials Processing Technology, 101, 95-103, (2000).
Lin, Y.C., Yan, B.H., Chang, Y.S., “Machining characteristics of titanium alloy (Ti-6Al-4V) using a combination process of EDM with USM”, Journal of Materials Processing Technology, 104, 171-177, (2000).
Uno, Y., Okada, A., Çetin, S., “Surface modification of EDMed surface with powder mixed fluid”, 2nd International Conference on Design and Production of Dies and Molds, Kuşadası, (2001).
Uno, Y., Okada, A., “Surface generation in electrical discharge machining with silicon powder mixed fluid”, International Journal of Electrical Machining, 2, 13-18, (1997).
Zhao, W.S., Meng, Q.G., Wang, Z.L., “The application of research on powder mixed EDM in rough machining”, Journal of Materials Processing Technology, 129, 30-33, (2002).
Ming, Q.Y., He, L.Y., “Powder-suspension dielectric fluid for EDM”, Journal of Materials Processing Technology, , 44-54, (1995).
Narumiya, H., Mohri, N., Saito, N., Ootake, H., Teunekewa, Y., Takawashi, T., Kobayashi., “EDM by powder suspended working fluid”, Proceedings of the 9th International Symposium for Electrode Machining, 5-8, (1989).
Wong, Y.S., Lim, L.C., Rahuman, I., Tee, W.M., “Near-mirror-finish phenomenon in EDM using powder-mixed dielectric”, Journal of Materials Processing Technology, 79, 30-40, (1998).
Mohri, N., Saito, N., Higashi, M., “A new process of finish machining on free surface by EDM methods”, Annals of the CIRP, 40, 1, 207-210, (1991).
Furutani, K., Saneto, A., Takezawa, H., Mohri, N., Miyake, H., “Accretion of titanium carbide by electrical discharge machining with powder suspended in working fluid”, Journal of International Societies for Precision Engineering and Nanotechnology, 25, 138-144, (2001).
Kruth, J.-P., Froyen, L., Stevens, L., Dejonghe, P., “In-process alloying of the white layer of a workpiece machined by die-sinking EDM”, International Journal of Electrical Machining, 3, 33-38, (1998).
Tzeng, Y. F., Lee, C. Y., “Effects of powder characteristics on electro discharge machining efficiency”, The International Journal of Advanced Manufacturing Technology, 17, 586-592, (2001).
Masui, K., Demizu, K., Sato, Y., Sone, T., “Surface modification of tool steels by alloying method using EDM process”, Proc. of ISEM-XI, 419-426, (1995).
Çalık, A., “Turkey’s boron minerals and their properties”, Journal of Engineer and Machine, 508, 36-42, (2002) (text in Turkish).
Kruth, J. P., Stevens, L., Froyen, L., Lauwers, B., “Study of the white layer of a surface machined by die-sinking electro-discharge machining”, Annals of the CIRP, 44, 1, 169-172, (1995).