The investigation of the tappi̇ng problems of ti6al4v alloy

Tapping with a tap is more complex than the machining processes done by other cutting tools. Also, this process becomes harder for such materials as Ti alloys, super alloys, etc. which are hard to machine and causes a decrease in the cutting tool (tap) life. Thus, it is required to determine the optimal cutting conditions (selection of tap, cutting parameters, etc.) in order to use the tap efficiently. In this study, screw cutting experiments have been carried out on Ti6Al4V alloy by using 5 different types of coated (TiAIN) and uncoated taps. The experiments were conducted in wet and dry conditions with 4 different cutting speeds (2,3,4 and 5 m/min) and a feed rate which is equal to thread pitch (1.25 mm/min). The tool life and the cutting forces of the taps were determined during tapping processes. The best results were obtained with straight flutes with spiral point taps in terms of cutting torque. Cutting torque increases were observed in coated cutting tools. Cutting torque increases were also observed in the wet cuting conditions. As a result, it was determined that straight flutes with spiral point taps exhibited the best cutting performance on Ti6Al4V material. With the experiments carried with this tap, between 10% - 74% better torque values were obtained compared to other taps in all cutting conditions.