Investigation the effect of point angle while drilling titanium

Titanium is classified as difficult to cut material due its high chemical affinity, low thermal conductivity, high hot hardness etc. In this paper the influence of point angle using Titanium- Ti-6Al-4V is studied. For that the finite element modelling of the drilling is carried with Johnson cook flow stress modelling with different operating parameters and different point angled tools. For experimental validation a 4mm solid carbide drill with TiAlN coating is used as the tool material with three different point angles to make a through hole using a vertical machining centre. The burr formed for different tool and parameters were observed. The chip formed during the machine was collected and the effect of point angle on the chip shape has studied. A drill cap was formed while using tool with 1400 point angle tool. During finite element modelling it is found that the stress at starting of the cutting edge is maximum as opposed to tool tip for 1180 pointed angle tool.