Abstract:Titanium alloys Ti6Al4V have superior properties,such as excellent strength-to-weight ratio,high corrosion resistance and good mechanical properties.However,due to its high chemical reaction and low thermal conductivity,tool wears seriously during cutting.In order to choose resonable cutting parameters so as to reduce tool wear,the friction characteristic of tool-chip/workpiece interface in machining Ti6Al4V with carbide tools were studied under different cutting speeds.The results show that,at rather low cutting speed,there are lots of adhesion materials in the close contact area in tool wear surface.At quite high cutting speed,the adhesion materials become unstable and diffusion occurs in the tool-workpiece interface.The peeling off of unstable adhesion material leads to tool micro-chipping and accelerates tool wear.When employing optimum cutting speed,the oxidation reaction occurs in toolworkpiece interface.The oxides generated in the cutting process acts as a boundary lubrication layer,which makes the chemical wear and adhesive wear to reach equilibrium,therefore,the high-temperature adhesion is inhibited and tool wear is reduced.