Experimental Study On Turning Of Titaninum Matrix Composites

Titanium matrix composites have so many excellent physical and mechanical properties, such ashigh specific strength, high specific modulus, high heat and wear resistance, anti-fatigue and so on,Nevertheless, Titanium matrix composites consist of a soft matrix holding together extremely hardreinforcing phase, which makes them poor machinability. The main concern when machining titaniummatrix composites is the extremely rapid tool wear, low machining efficiency, high cost and hard toensure the accuracy and quality of parts, which hinders the practical application of titanium matrixcomposites. Thus, it is very significant to deeply study and correctly evaluate the machinability of thetitanium matrix composites. To solve the problems during machining process and promote theapplication of titanium matrix composites, experimental research of machinability were carried outwhen turning titanium matrix composites, by using brazed polycrystalline diamond （PCD） tools andconventional cemented carbide tools. The following works have been developed:1. Tool life in turning of titanium matrix composites was investigated. The effects of differenttools and workpiece material on tool life were studied, the performance of PCD and cemented carbidetools were studied comparatively in turning of titanium matrix composites.2. Tool damage and tool wear mechanism in turning of titanium matrix composites with differenttool material were investigated. The three-dimensional video microscope, SEM and EDS wereutilized to investigate the effect of cutting speed on tool wear. Tool morphology of PCD and cementedcarbide tools were studied comparatively in cutting titanium matrix composites. On this basis, the toolwear mechanism was revealed.3. The machinability of the titanium matrix composites was comprehensively evaluated. Cuttingforces and cutting temperature in machining process were measured and analyzed, on this basis, Toollife were also comparatively studied in order to comprehensively evaluate the machinability of titaniummatrix composites.