| Titanium alloys have the characteristics of high strength, excellent corrosion resistance, good heat resistance,so they have been widely used in various fields,especially in the aerospace industry. However,they are difficult to machine due to their poor thermal conductivity, high chemical activation and low elastic. Currently, rotary ultrasonic machining on Titanium alloy has developed, many research scholars have obtained constructive research achievements, such as machining mechanism, method of removing material and force theory. Whereas, there have not been a complete and systematic research on tool wear, this will be a span-new field.In this thesis, the author will launch a research about wear of tool of fixed grain in rotary ultrasonic machining on titanium alloy. The research include three aspect:theoretical modeling, DEFORM simulating and finishing of experiments’observation.1.In view of that there is a strong correlation between tool wear and tangential force, the author will develop a tangential force model for a single spherical abrasive in rotary ultrasonic machining on titanium alloy, then analyze the variables’influence on tangential force to predict the tool wear in practical experiments.2. Using finite element software DEFORM, the author will build a single spherical abrasive model to complete the simulation for rotary ultrasonic machining on titanium alloy. Then we abtain the results of torque and tool wear. The simulation result can verify the theoretical model of tangential force well.3. The author will launch experiments on rotary ultrasonic machining on titanium alloy. When we finish the experiments, we will observe the force result and abrasion loss of quality, then develop the tool wear model. The experiment’s results verify the theoretical model partly. In addition, we also observe the surface appearance of the tool using microscope, summarize the wear styles of diamond abrasive and bonding material and analyze the wear mechanism causing the wear phenomenon. |
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