Abstract:

In this study, molybdenum of commercial purity with good mechanical properties was threaded. Hole diameter, thread material and form, coating and cutting speed are the most important factors affecting thread quality in tapping operations. On the other hand, the appropriate cutting speed is very important for easy removal of the chip and increased tool life. The aim of this study is to determine the appropriate cutting speed on the basis of low cost and high efficiency in tapping operations performed on commercial purity molybdenum. For this purpose, nine different cutting speeds (2, 3, 4, 5, 6, 7, 8, 9 and 10 m/min) were performed using HSS machine taps. As a result of the experiments, the images of the screw crest, root and the height of the thread were measured. Material losses and fractures were observed during tapping of commercial purity molybdenum. This material loss occurred at relatively low cutting speeds. 9 m/min cutting speed optimum results obtained while the 10 m/min cutting speed losses increased screw thread profile began to deteriorate.

Keywords: