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| Surface Residual Stress of Gamma Titanium Aluminide in Milling Process |
| XU Weifeng, YAN Ran, LIU Weiwei |
| ( School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China ) |
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Abstract In order to explore the influence law of milling parameters on residual stress induced in the process of milling
ideal high-temperature structural material of gamma-TiAl alloy, the extreme difference analysis method is used based
on orthogonal experiment data processing. The relationships between different levels of process factors and residual stress
are established, as well as the thermal-mechanical mechanisms are analyzed. At the same time, a sensitivity mathematical
model of machining factors to residual stress is obtained, which determines the parameters optimization range to get larger
residual compressive stress. Research shows that during the range of experimental parameters, the residual stresses along
the direction of stepper and feed are all compressive caused by cold plasticity deformation mainly. With regard to cutting
parameter sensitivity analysis, it has been found that the residual stress is most sensitive to the milling speed, as one of design
variables, while nearly the same degree to feed per tooth, cutting depth and cutting width, which provides a theoretical
basis to control surface residual stress in the milling process of titanium aluminium alloy.
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2017, 
