LAUSR

In this paper, the contact phenomenon of meshing of sliding gear tooth used in planetary gear train (PGT) of CNC bending machine is simulated to estimate the coefficient of friction (COF), frictional force (FF) and wear rate of various steel alloys. Planetary gear systems continually transmit highest torque and reduction ratio. In this work, the experiments are performed on a pin-on-disk apparatus to estimate tribological characteristics of different gear materials with different loading conditions. Pins were mounted in a pin holder and fed against a rotating disk at a required speed. The trials were performed on a group of steels alloys for duration of 5 min for load of 50 N and 100 N with disk speed of 350 rpm. The results show that the COF varies with duration of rubbing and normal load. In general, COF increases for a certain duration of rubbing and after that it remains constant for the rest of the experimental time. The wear of carbon steel is significantly reduced due to more carbon content. Hence, it becomes imperative to analyze the wear characteristics of different types of steel materials, particularly EN8, 20MnCr5, EN19, EN24 and M.S. sliding against EN-31 disk on a case-to-case basis in order to arrive at a more realistic assessment of friction and wear performance.