STUDY OF ULTRASONIC ASSISTED TURNING OF 4340 STEEL WITH PLANE AND SELF-LUBRICATING CUTTING INSERTS

摘要

The machining of intractable materials result in several problems that are required to be addressed for industry. The conventional turning of such materials is characterized by low material removal rate, which ultimately hampers the productivity. The present research work focuses on enhancing the machinability of Ultrasonic Assisted Turning (UAT) using self-lubricating cutting inserts. The formation of a thin lubricating layer combined with the aerodynamic lubrication is found to be responsible for decrease in the frictional force. A comparative study has been presented between plane and self-lubricating cutting insert over a range of cutting speed. The study of cutting force, surface roughness, shear angle and coefficient of friction demonstrate the better machining regime using textured cutting inserts during UAT. The chip analysis has been provided to indicate chip coiling due to the superimposition of ultrasonic vibration on the cutting insert.