Investigations On The Machinability Of Titanium Alloy TC25 In High Efficiency Milling

The characteristics during machining TC25, the chip morphology, cutting force, cutting temperature, surface roughness, surface morphology and residual stress and working hardening are systematically analyzed, which compared with titanium alloy TC4, using the method of single factor experiment and orthogonal experiment. Theoretical and practical support are provided in high efficiency machining TC25.The process of chip morphology, chip shape and deformation are studied from both theoretical and experimental aspects by the single factor experiments. The influences of cutting parameters on chip formation are analyzed comparing with TC4. Variation of the saw tooth level, concentrated shear rate, shear angle and slip angle with the cutting speed and feed rate, which effect on chip morphology obviously, are analyzed.The milling experiments with standard L16 (4) orthogonal arrays are conducted to assess the cutting forces of TC25 and TC4. The influences of cutting parameters on cutting forces are analyzed by range analysis. The empirical formulas for evaluating the milling force are concluded by means of regression analysis. Besides, the influences of cutting parameters on cutting forces are analyzed in the single factor experiments.Cutting temperatures are measured by the infrared radiation temperature measurement method in the multi-factors orthogonal experiments. The influences of cutting parameters on the cutting temperatures of TC25 are analyzed, which compared with TC4. Besides, the influences of cutting parameters on cutting temperatures are analyzed in the single factor experiments. The causes of the effects are also analyzed.At last, the surface roughness, surface morphology, residual stress and microhardness of the machined surfaces are analyzed. The surface roughness and surface morphology are measured by WYKO NT9300. The influence of cutting parameters on surface roughness and surface morphology of TC25 and TC4 are analyzed. The residual stresses are measured by XSTRESS3000. The influences of cutting parameters on residual stress are analyzed in the single factor experiments. The microhardness of the surfaces is measured by MH-6 microhardness tester.