Experimental Study On Cutting Titanium Matrix Composites With PCD Tool

Titanium Matrix Composites(TMCs) have a wide range of applications in a lot of fields such as aeronautics and astronautics, vehicles, due to its outstanding physical and mechanical properties. However, the machinability of TMCs is poor due to the reinforcements added into the matrix,and the extremely severe and rapid tool wear are prominent, which hinder the popularizations and applications of TMCs. In this thesis, TMCs are used for cutting experimental research with PCD tools. The cutting force and cutting temperature are evaluated.The tool wear form and mechanism are analyzed to provide a basis for the optimum of cutting parameters and the improve of cutting processability.The main contents are as follows:(1) The moelectric properties of TMCs-PCD,TMCs-constanton are calibrated,and the thermoelectric characteristics are obtained.The measured thermoelectric power signal are analyzed.The cutting temperature is analyzed while cutting TMCs with different cutting speeds, reinforcement contents and tool wear using PCD tools,which applies for studying the tool wear mechanism.(2) The effects of the cutting speed,reinforcement content and the tool wear on cutting force are revealed using PCD tools.(3) The tool lives are studied under different contions and the main causes influence the tool lives are revealed. Furthermore, tool wear morphology and mechanism are revealed while cutting titanium matrix composites with PCD tools.