Dissertation
Dissertation > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > General issues > Metal cutting process

Surface Integrity and Cutting Parameters Optimization in Machining of New Titanium Alloys

Author YangBo
Tutor LuWenZhuang;ZuoDunWen
School Nanjing University of Aeronautics and Astronautics
Course Mechanical Manufacturing and Automation
Keywords Titanium alloy Turning High Speed ??Milling Surface integrity Parameter optimization
CLC TG506
Type Master's thesis
Year 2010
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Titanium alloy, although widely used but it is a kind of difficult to machine materials , how to improve the cutting quality and processing efficiency has been an urgent need to solve the problem in the manufacturing technology of the aerospace industry and other industries . In this paper, a factory recently developed a new type of titanium alloy TC21 , TC4 study , a more in-depth study of its cutting surface integrity and optimization of cutting parameters , the completed work and the research results obtained are summarized as follows : 1. through the new titanium turning experiments , analysis of the cutting parameters , tool geometry , tool wear on surface roughness ; summed up cutting the amount of surface microstructure and work hardening . The study results show that the new titanium turning choose the right tool geometry , tool blunt standard easy access to the lower surface roughness ; cutting the amount of feed on the surface roughness of the greatest impact , cutting speed and depth of cut of the roughness no significant impact ; the new titanium turning hardening and hardening layer depth . New titanium high - speed milling experiments to analyze the amount of cutting tool wear on surface roughness of the impact of the law , given the choice of milling parameters principle ; analysis of high-speed milling titanium alloy surface morphology ; process parameters work hardening law ; access to cutting the amount of tool wear on surface residual stresses were investigated . The obtained results show that the high - speed milling of the new titanium low residual stress, and low surface roughness value and a smaller degree of hardening of the machined surface . In response to the high-speed milling of titanium alloys as the objective function to maximum material removal rate and a minimum surface roughness , machine tools , cutting tools , technology and other factors limit for the constraints of the cutting parameters optimization model , based on experimental data, high-speed milling cutting forces , residual stresses, surface roughness formula . The genetic algorithm has been optimized for high-speed milling titanium alloy TC4 B-1 cutting parameters . The experimental validation results show that the optimization parameters cutting machining surface roughness , the feed direction of the force components and cutting width direction contribute experimental value is in good agreement with the theoretical value , and a significant increase in processing efficiency .

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