Experimental Research On Milling Of Titanium Alloy TC4 Under Dry Ice Cooling

As one kind of difficult-to-cut materials,titanium alloy has been widely used in the aerospace,chemical,petroleum,medical industry and other fields for its high specific strength,anti-corrosive and strong thermal stability.However,due to its poor machinability,rapid tool wear is the bottleneck which restricts the enhancement of machining efficiency of these materials.Aiming at this problem,some exploratory researches on rough and finish milling of titanium alloy TC4 with dry ice internal cooling were done in this paper.The major research works were included as follows:(1)High feed milling experiments of titanium alloy TC4 were carried out to investigate the cutting force and cutting temperature under dry ice internal cooling and traditional emulsions condition as contrary.The influence of cutting parameters,tool wear on cutting force and the influence of cutting parameters on cutting temperature and chip morphology were analyzed.(2)Tool wear and tool life of coated carbide tools in high feed milling of titanium alloy TC4 under dry ice internal cooling were investigated.The effects of coolants,cutting speed,cutting edge and tool material on tool life were compared.The tool wear mechanism was also studied.(3)Finish machining experiments of titanium alloy TC4 were carried out to investigate the cutting force,cutting temperature,surface roughness and tool wear under dry ice internal cooling and dry condition as contrary.The influence of cutting parameters,tool wear on cutting force and the influence of cutting parameters on cutting temperature and surface roughness were analyzed.The variation of tool wear was also studied.The material removal rates of high feed milling and finish machining under dry ice interal cooling were compared.