Formation Mechanism And Dimensional Rule Of Titanium Alloy Burr

Titanium alloy has the advantages of high specific strength,corrosion resistance,good biocompatibility,etc.It has a wide range of applications in many fields such as aviation industry and biomedicine.At the same time,titanium alloys have the disadvantages of small specific heat capacity,poor thermal conductivity,etc.,which cause problems such as tool wear and sticking in the processing process.It is easy to produce burrs on the processing surfaces of the workpiece,and it is one of the recognized materials that are difficult to machine.Based on this,taking the typical Ti6Al4 V alloy in titanium alloy as the research object,the following research is carried out:(1)Systematic analysis of burr formation process is carried out.First,the flow behavior of material in metal cutting is studied,and the principle of milling is explained in depth.Second,considering the influence of the front angle of the tool,the change of the thickness of the milling layer in the milling process is analyzed.Third,based on the theory of elastoplastic mechanics and the principle of conservation of function,the size model of the metal cutting burr is pushed and guided.(2)Formation mechanism and size variation of cutting burr of Ti6Al4 V alloy is studied.Two dimensional right angle cutting burr model of Ti6Al4 V alloy has been established in Deform 2D,and has been systematically studied in three aspects.From the angle of strain rate,the forming process of cutting burr in Ti6Al4 V alloy is analyzed.From the angle of cutting force,the change law of cutting force of cutting tool in the process of cutting burr in Ti6Al4 V alloy is explored.From the point of view of temperature field,the change of the temperature field of tool tool in the process of cutting burr in Ti6Al4 V alloy is studied.On this basis,the influence of the number of backcutters,the tool rake angle and the radius of the cutting edge of the main cutting edge on the cutting burr size is systematically analyzed.(3)The mechanism of burr milling of Ti6Al4 V alloy straight groove is studied.On the basis of two-dimensional right angle burr research,the 3D burr model of Ti6Al4 V alloy straight groove milling was established by using Deform 3D.From three aspects,the whole distribution of burr,the distribution of temperature field and the changing trend of the cutting force of the cutting tool,the process of burr formation in the straight groove milling of Ti6Al4 V alloy is analyzed by multi angle.(4)Research on the influence of milling burr size and milling cutter helix angle on burr size in Ti6Al4 V alloy.The experiment of Ti6Al4 V alloy straight groove milling was carried out.The influence of backfeed,spindle speed and feed speed on the burr size was systematically analyzed.By comparing the simulation with the model,the accuracy of the model is verified.On this basis,the influence of the spiral angle of different milling cutter on the burr is studied,and the spiral angle and the spiral angle range are obtained.