Study On Tool Structure Optimization And Tool Wear In Side Milling Of Titanium Alloy TC4 With End Mill

Titanium alloy with high specific strength,good oxidation resistance,good corrosion resistance and high heat resistance rapidly access to the field of aerospace and become one of the main structural materials.But titanium alloy is a typical difficult to process materials,in the processing process has a low thermal conductivity,high chemical activity,milling force,tool wear and other issues,which inevitably affect the surface integrity of processed parts,and thus affect the Fatigue properties of titanium alloy components.In the processing of titanium alloy,the tool geometry parameters on the workpiece deformation,milling force and tool wear have an important impact.Therefore,it is important to study the geometrical parameters of the tool during the milling of titanium alloy.In this paper,the geometrical parameters of the whole cemented end mill are optimized by side milling titanium alloy test.The main contents of the thesis are as follows:(1)The effect of geometric parameters on the milling force and surface roughness of the cemented carbide end mill was studied by orthogonal design.The geometrical parameters of the tool were analyzed by the range method.And the geometric parameters of the tool are optimized by Taguchi method with the minimum surface roughness as the goal.The results show that the effect of the helix angle on the main milling force Fy is the largest,and the C-shaped blade angle is the second,and the width of the C-shaped blade is the least.When the helix angle is 25 °,the width of the C-shaped blade is 0.2mm,25 ° to obtain the minimum surface roughness.(2)The optimized end mills and conventional end mills were used to compare the milling force and surface roughness of the two end mills,and the excellent performance of milling cutter side milling TC4 was optimized.The results show that under the same machining parameters,the milling force and surface roughness of the C-shaped edge milling cutter are smaller than those of the conventional end mill.(3)The effect of milling speed on the tool wear of C-shaped end mill and conventional end mill was studied.The results show that the tool wear of the C-shaped end mill and the conventional end mill increases with the increase of the milling speed.At the same speed,the wear of the C-shaped end mill cutter is lower than that of the conventional end mill.The same amount of wear of the C-shaped end mill is lower than that of the conventional end mill at the same distance.The durability of the C-shaped end mill is higher than that of the conventional end mill.The effect of milling speed on tool wear of C-shaped end mill and conventional end mill is studied 。 The scanning electron microscopy(SEM)and energyspectrum analysis are used to analyze flank wear.The results show that the wear mechanisms are adhesion wear,diffusion wear and oxidation wear,in the process of side milling titanium alloy by carbide end mill。...