Study On The Milling Machinability Of Gamma Titanium-Aluminum Intermetallic Compoundnd

The level of aviation manufacturing industry is the representative of the country's advanced manufacturing industry,the development of high-temperature alloys play an important role in the aviation manufacturing industry.In order to meet the development of aerospace technology to the higher requirements of components,emerging new materials,new materials with excellent physical and chemical properties,but if you want to promote a wide range of engineering,its processing performance research is necessary.?-TiAl intermetallic compounds with low density,high specific strength,strong creep resistance and good high temperature stability and other characteristics.Its work stable temperature can reach 900 ?,its density is only about 50% of nickel-based alloys,the academy is widely considered to be the future can replace the nickel-based alloy of high-temperature alloys,in aviation and automotive and other high-end manufacturing has better application prospect.The typical physical properties of ?-TiAl intermetallic compounds cause poor machinability,poor surface quality and low processing efficiency,which will affect the wider application of ?-Ti Al intermetallics.Therefore,it is important to study the machining mechanism of ?-Ti Al intermetallic compound and to study the influence of cutting parameters on the surface quality of the machined surface,and to improve the surface quality and guide the processing production.In this paper,the mesoscopic cutting model of ?-Ti Al intermetallics is established by finite element analysis,and the mechanism of ?-TiAl intermetallic compound is studied deeply.The results show that ?-TiAl intermetallic compounds are difficult to be processed,the material deformation coefficient is small,the chip is needle-like,and the chip edge is easy to form,which results in the lack of edge material.The formation mechanism of edge defects of ?-TiAl intermetallic compounds was studied by simulation,and the influence of different cutting parameters on the edge defect size was investigated.Results The surface cutting depth and feed rate have great influence on the edge defect size,and the cutting speed has the least effect on the edge defect size.The edge shape of the grain boundary affects the edge defect size.The influence of cutting parameters on the machined surface geometry,roughness,plastic deformation and work hardening degree was studied,and the effects of different cutting parameters on the machined surface quality were analyzed.The typical defects on the surface of ?-TiAl intermetallic milling are studied,and the formation mechanism of typical defects is investigated.The results show that the cutting depth has the greatest influence on the machined surface quality.With the increase of the cutting depth and the cutting speed,the surface quality of the machined surface is deteriorated.The phenomena of material pull-out,peeling and microscopic cracks exist on the milling surface.The surface hardening of the surface is hardened,and the surface hardening depth is about 120?m.