1 research outputs found
Analysis of a free machining α+β titanium alloy using conventional and ultrasonically assisted turning
Rapid advancements in power generation and aviation industries have witnessed a
widespread use of titanium and its alloys in many applications. This is primarily due to their
excellent mechanical properties including, amongst other, high strength-to-density ratio,
outstanding fatigue properties and corrosion resistance with the ability to withstand
moderately high temperatures. However, this combination of properties results in poor
machinability of the material, increasing the cost of components machined with
conventional cutting techniques. Recently, Ti 6Al 2Sn 4Zr 6Mo, a modern titanium alloy with
improved mechanical properties, has been introduced as a possible replacement of Ti 6Al 4V
in aerospace industry. However, its poor machinability and formation of long chips in
conventional turning are main limitations for its wide-spread application. Therefore, a new
alloy based on Ti 6Al 2Sn 4Zr 6Mo, namely Ti 6Al 7Zr 6Mo 0.9La, was developed; it shows enhanced machinability generating short chips during metal cutting, which prevents
entanglement with cutting tools improving productivity. To further enhance the
machinability of this material, a novel hybrid machining technique called ultrasonically
assisted turning (UAT) was used. Experimental investigations were carried out to study the
machinability, chip shapes, cutting forces, temperature in the process zone and surface
roughness for conventional and ultrasonically assisted turning of both alloys. UAT shows
improved machinability with reduced nominal cutting forces, improved surface roughness of
the machined workpiece and generation of shorter chips when compared to conventional
machining conditions