| Titanium alloy is a high-quality alloy with high strength,good corrosion resistance and heat resistance.It is widely used in aerospace,military,and automotive industries.Titanium alloy has high hardness,small modulus of elasticity,and poor thermal conductivity.In general turning,continuous chips will be generated,and the wear of the tool is serious,which greatly reduces its processing efficiency.The principle of orthogonal turning and milling is to cut the workpiece by rotating the milling cutter and the workpiece simultaneously.It is an efficient and advanced processing technology.Orthogonal turning and milling can not only reduce the cutting temperature,but also extend the service life of the tool.Turn-milling has obvious advantages in processing difficult-to-process titanium alloy materials.In this paper,the orthogonal turning and milling method is used to process TC4 titanium alloy.During the processing of TC4 titanium alloy,the effects of orthogonal turning and milling parameters on cutting force,tool life and surface roughness of TC4 titanium alloy are studied,as follows:(1)The effects of orthogonal turning and milling parameters on cutting forces are studied through a single factor experimental design.The effects of these orthogonal turning and milling parameters on the maximum cutting force on the face edge,the maximum cutting force on the circumferential edge,the average cutting force and the average cutting power were studied by changing the axial feed,cutting depth,milling cutter speed and workpiece speed.The results show that:The maximum cutting force of the end face,the maximum cutting force of the circumferential edge,the average cutting force,and the average cutting power all increase with the increase of the axial feed;the maximum cutting force,average cutting force,and average cutting power of the end face increase with the cutting.As the depth increases,the maximum cutting force of the end face,the cutting force of the circumferential edge,and the average cutting force decrease as the milling cutter speed increases,and the cutting power is reversed;the maximum cutting force of the end edge,the maximum cutting force of the peripheral edge,and the average Both cutting force and average cutting power increase with increasing workpiece speed.(2)The effects of orthogonal turning and milling parameters(cutting speed,feed rate,and cutting depth)on tool life were studied through an orthogonal experimental method of three factors and three levels.The results show that during the test of orthogonal turning and milling TC4 material,the tool the rake face is mainly worn by the crescent crater,the blade tip is severely damaged,and flake flaking wear occurs,and the flank face is mainly represented by groove wear;the degree of influence on the tool life in orthogonal turning and milling parameters is:The speed is the largest,the cutting depth is the second,and the feed amount has the least influence.When the milling speed is 250 m/min,the axial feed is 3 mm/r,and the cutting depth is 0.3 mm,the tool life is the largest;Most of the chips obtained during machining are short chipbreakers,which belong to chipbreaking machining.(3)The effects of orthogonal turning and milling parameters(milling speed,workpiece speed,and axial feedrate)on the surface roughness were studied by orthogonal experiment method.Empirical formula for surface roughness.The following conclusions are obtained:The primary and secondary order of affecting the surface roughness in the orthogonal turning and milling parameters is milling cutter speed>workpiece speed>axial feed;during orthogonal turning and milling of TC4 titanium alloy,the milling cutter speed is 5500 r/min,the workpiece speed is 3 r/min,and the axial feed is 1 mm/r or 1.5 mm/r,the surface roughness of the TC4 titanium alloy machined by orthogonal turning and milling is the smallest and the machining accuracy is the highest;The empirical formula between milling cutter speed A,workpiece speed B,axial feed C and surface roughness is Ra=10.49A-0.0074B0.304 C1.0354... |
PDF Full Text Request