Abstract
Ti-6Al-4V alloy has been tapped with the HSS/Co-M35 by the orthogonal test method. The empirical relationship between the cutting force and four type parameters are given. Also, factors such as hook angle, relief angle, passivation edge radius and main spindle speed collected from the AdvantEdge FEM software are examined by using both statistical analysis and regression analysis. The impact of tapping performance under the multiple type parameters of tap which contain hook angle, relief angle, passivation edge radius and main spindle speed are studied by extreme difference analysis. Three tapping performance indexes which are maximum torque, axial cutting force and cutting temperature have been converted into a single composite indicator yi* by using the comprehensive evaluation method. The optimal process parameters in test are that rake of tap is 11°, relief angle is 12°, and passivation edge radius is 0.015mm, while main spindle speed is 250r/min.
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