Akademik Veri Yönetim Sistemi
3. Global Research on Multidisciplinary Sciences, İstanbul, Türkiye, 4 Temmuz - 07 Ekim 2022, ss.20-33, (Tam Metin Bildiri)
The highest usage rate among titanium alloys; belongs to Ti6Al4V alloy due to its
excellent chemical and mechanical properties, good heat treatment, and weldability
properties. The necessity of good surface quality and measurement accuracy of Ti6Al4V
alloy products brings machining processes to the fore. Since it has a low modulus of
elasticity and thermal conductivity, strong tools are needed especially in hole drilling.
The biggest problem in drilling with a drill bit is the difficulty in ejecting the chip from
the hole and the increased temperature. These problems experienced in the drilling of
Ti6Al4V alloy made it necessary to work in this field. In this study, the drillability of
Ti6Al4V alloy, which is difficult to process and preferred in many sectors, was
investigated according to different drill diameters and cooling mediums. For this
purpose, drilling operations were carried out using Ø7.5 mm and Ø8.4 mm carbide drill
inserts, using 50 m/min cutting speed, 0.08 mm/rev feed rate and 20 mm drilling depth
in dry and cool environment. The chip formation mechanisms, surface roughness
measurements and wear mechanisms of the inserts and the structure of the drilled
surfaces were characterized. As a result of the study, better surface quality and cutting
tool life were obtained in drilling with the use of Ø7.5 mm diameter drill inserts and
cutting fluid. With increasing drill diameter, wear increased in both cutting
environments. It has been determined that the use of coolant has a more decisive effect
on the chip form than the drill diameter.