Study On Cutting Performance Of Coated Cemented Carbide End Milling Tool In High-speed Milling Of Titaniumalloy

Titanium alloys are extensively used in aerospace industry, weapons develop-ment and medical chemical because of their excellent properties of high specificstrength (strength-to-weight ratio), high heat resistance and corrosion resistance etal.However, Because of high chemical activity, low thermal conductivity and lowmodulus of elasticity which lead to rapid tools wear, low tools life and high cost.Based on the high-speed milling Ti6A14V as the research object, finding suitablecarbide coated tools for cutting of titanium alloy. Selecting the TiAlN and PCDcoated cemented carbide tools as the research object, a comprehensive analysis ofprogressive tool failure processes, parameter optimization process and tool life baseon the cutting force and cutting temperature in high speed milling of Ti6Al4V. Thecutting performance of cemented carbide coating tool is evaluated in high speedmilling of titanium alloy.Firstly, this paper preferred suitable tools for cutting titanium alloy based onmethods of the coating process and material properties and cutting performance oftool and seek out the carbide coated tools on cutting titanium alloy. Finally the twotypes of coating TiAlN and PCD were selected.Again, an analytical model of cutting force is established of the indexablemilling cutter; through finite element simulation and single factor experiment, thecutting force and cutting temperature variation were comparatively analyzed ofTiAlN and PCD two coating materials cemented carbide tools in high-speed millingTi6Al4V. The process parameters of cemented carbide coating tools which wasexcellent were analyzed in detail, and the influence of tool wear on cutting forces andtemperatures were studied. The influence significance of cutting parameters wasdetermined by orthogonal experiment and the most suitable machining parameterswere selected.Finally, the tools wear morphology and the tools life of coated cemented carbidewere studied in high speed milling of Ti6A14V. The wear morphology of tools were were observed by super depth of field microscopy. In addition, the influence ofcooling and lubricating ways were studied on tools wear, founding that Ti6Al4V isnot suitable for cutting in fluid environment. It is finally showed PCD coating caneffectively improve the tool life in high speed milling of Ti6Al4V.