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| Milling Parameters Optimization for Finish Machining TB6 Based on Machined Surface Integrity |
| GUAN Chunming, LI Xun, LUO Yang, NIU Yongsong |
| ( School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China) |
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Abstract TB6 titanium alloy is widely used in aviation because of its high strength-to-weight ratio and extraordinary
hot deformation behavior, which is the main material to manufacture the primary structure of helicopter rotor systems
as well as the landing gears. To ensure the parts meet the requirement of fatigue properties, finish milling parameters have
been optimized based on the integrity of machined surface. The experiment results show that feed per tooth fz has an obvious
influence on the roughness R a and residual stress σH of the machined surface. When fz increases, the surface roughness
increases linearly. Meanwhile, the amplitude of the residual stress also increases with the increase of fz . The microhardening
rate is mainly effected by the cutting speed vc. The increase of vc leads to the decrease of the micro-hardening
rate. On the other hand, it can be obtained that the cutting width ae has a great influence on the machined surface residual
stress. When ae increases, the amplitude of surface residual stress reduces obviously. According to improving the fatigue
properties, low cutting speed vc , small cutting width ae and high feed per tooth fz should be adopted. At the same time, the
appropriate cutting depth ap can be utilized under the premise of meeting all the design requirements, such as the surface
roughness and machining efficiency.
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2017, 
