Investigations On The Performance Of Ultrasonic Drilling Process With Special Reference To Precision Machining Of Advanced Ceramicsc

Abstract

Advanced ceramics are assuming an important role in modern industrial technology. The applications and advantages of using advanced ceramics are many.There are several reasons why we should go in for machining of advanced ceramics after their compacting and sintering. These are discussed in this paper. However,precision machining of advanced ceramics must be economical. Critical technological issues to be addressed in cost effective machining of ceramics include design of machine tools, tooling arrangements, improved yield and precision, relationship of part dimensions and finish specifications to functional performance, and on-line inspection.Considering the above Ultrasonic Drilling is an important process used for the precision machining of advanced ceramics. Extensive Studies on tool wear occurring in the ultrasonic machining of advanced ceramics have been carried out. In addition, production accuracy of holes drilled, surface finish obtained and surface integrity aspects in the machining of advanced ceramics have also been investigated. Some specific findings with reference to surface integrity are: (a) There were no cracks or micro-cracks developed during or after ultrasonic machining of advanced ceramics. (b) While machining Hexoloy Alpha Silicon Carbide a recast layer is formed as a result of ultrasonic machining. This is attributed to the viscous heating resulting from high energy impacts during ultrasonic machining. While machining all other types of ceramics no such formation of recast layer was observed, and (c) There is no change in the micro-structure of the advanced ceramics as a result of ultrasonic machining.