ULTRASONIC MACHINING AND ITS CAPABILITIES IN MACHINING OF TITANIUM -A STATE OF THE ART REVIEW

摘要

Ultrasonic Machining is one of the most widely used non-traditional machining processes for the machining of non-conductive, brittle materials such as engineering ceramics. USM process has been employed commercially to a large extent for machining of relatively hard and brittle materials such as glass, ceramics, quartz, precision stones and diamond etc. Although the process can also be applied to the machining of tough materials, this issue has not been explored to a great extent so far because of extremely low machining rate of ultrasonic machining and high tool wear rate when applied to such materials. This paper reviews the fundamental principles of ultrasonic machining; the modes and mechanisms of material removal and the effect of operating parameters on the performance indices-Material removal rate (MRR), tool wear rate (TWR) and surface roughness. The issues of production accuracy and precision in drilling deep holes have also been explored. It has been concluded that ultrasonic machining could be applied effectively for micro hole machining in relatively tough materials as well. In contrast to brittle materials, when applied to tough material, ultrasonic machining results in low Material removal rate (MRR), High tool wear rate (TWR) and low surface roughness.