Investigation Of Geometric Properties Of Micro Holes Drilled By Using Electrical Discharge Machining (Edm) Method

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Thesis Type: Postgraduate

Institution Of The Thesis: Gazi Üniversitesi, Fen Bilimleri Enstitüsü, Turkey

Approval Date: 2020

Thesis Language: Turkish

Student: MERVE EKİCİ

Supervisor: OĞUZHAN YILMAZ

Abstract:

In the present work; 400 and 500 m micro holes were drilled by using electrical discharge machining (EDM) method with different machining parameters (current, pulse-on time and pulse-off time) on Ti-6Al-4V (titanium) and Inconel 718 work pieces material. Single channel, rotational brass electrodes were used to drill micro holes. The objective of this study is to investigate the geometric properties of micro holes drilled by using EDM method; specify the best geometric properties obtained, the machining parameters to achieve these properties and the most effecting machining parameters on each geometric property. For these purposes, overcut, taper and surface roughness were measured on each experiments. Overcut, taper and surface roughness values are lower on Ti-6Al-4V rather than Inconel 718. For Ti-6Al-4V work piece material, minimum overcut ratio: 26,93%, taper: 0,38%, surface roughness: 2,42µm. For Inconel 718 work piece material, minimum overcut ratio: 70,53%, taper: 0,59%, surface roughness: 2,32µm. For both work pieces, lower overcut, taper and surface roughness values were achieved on 500 m holes. The smaller the diameter of the holes, the lower the overcut, taper and surface roughness values.