Abstract
In this study, the effect of changing processing parameters on the burr formation ats the exit end of hole during the drilling process in milling machines of CNC (Computer Numerical Control) was examined. . In experimental studies, cold work tool steels (AISI D2, 20 HRC and AISI D3, 28 HRC) were drilling by HSS cutting tools with four different lengths in two different diameters (O 8 mm and O 10 mm). Three different cutting speeds (5 m/min, 10 m/min, 15 m/min) and three different feed rates values (0.04 mm/rev, 0.05 mm/rev, 0.06 mm/rev) were used in experiments. According to outcomes of the experiment, it was detected that burr height decreases depending on feed rates increase and burr height increases depending on the number of holes, cutting speed and material hardness.
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