Investigations on drilling of cfrp ti6al4v stacks usingmodified twist drill under dry and minimum quantity lubrication mql conditions

Abstract

Composites are used together with other material to form a stack of multiple materials which results in a higher strength weight ratio The composite of Carbon Fiber Reinforced Plastic CFRP with Aluminum Al or Titanium alloy Ti6Al4V has been widely used by the aerospace industries Commercial aircraft structural components are made extensively using light weight and high strength materials like CFRP Ti6Al4V and stacks composite such like CFRPTi6Al4V CFRPAl and CFRP/AlTi6Al4V Although materials can be manufactured separately and stacked together to attain a near net shape it still involves post processing operations such as trimming and drilling It is a challenging task to drill CFRPTi6Al4V or CFRPAl or AlCFRPTi6Al4V at one time due to the lack of uniformity in the properties of the material Based on the literature review the present work attempted to investigate on hole quality during drilling of CFRPTi6Al4V stacks An experimental study was carried out on drilling of CFRPTi6Al4V stack using 5mm solid carbide drill tool coated with Titanium Aluminium Nitrate TiAlN It is vital to have an optimal machining condition and tool geometry for better hole quality and tool life newline