鈦合金Ti6Al4V激光加熱輔助車削過程的仿真分析與實驗研究
[Abstract]:Titanium alloy is a kind of alloy with high specific strength, high thermal strength, good low temperature performance and strong corrosion resistance, which is based on titanium. It is widely used in aerospace, medical, chemical and other industries. However, because of the poor thermal conductivity and high chemical activity of titanium alloy, the cutting temperature is high and the tool wear is fast, so the large-scale application of titanium alloy is restricted by machining efficiency and processing cost. Therefore, it is of great significance to explore the new processing technology of titanium alloy and improve its processing performance. Laser heating assisted cutting is a new hybrid machining technology, which can reduce cutting force and cutting energy, prolong tool life and improve surface quality. At present, the research of laser assisted processing is mainly focused on ceramic materials, and the research methods are limited to experimental research. In this paper, the laser-assisted turning technology of Ti6Al4V titanium alloy is studied by means of finite element simulation and experiment. The main contents are as follows: firstly, based on the classical theory of heat transfer, the 3D finite element model of laser preheating titanium alloy is established, and the numerical simulation of multiple laser parameters is carried out. The laser energy absorptivity of titanium alloy is determined by the method of experiment and simulation. By comparing the simulation results, the effects of laser power, laser moving speed, spot radius and tool / laser distance on the preheating temperature field are analyzed. Suitable machining parameters are selected for subsequent simulation and experimental study. Based on the constitutive model of Johnson-Cook material and the corresponding fracture criterion, the complete thermal-mechanical coupling finite element model of orthogonal turning titanium alloy workpiece is established. The simulation of traditional machining and laser assisted machining under multiple processing parameters is carried out. By analyzing the simulation results of stress field, temperature field and cutting force, the mechanism of laser assisted machining to improve machining state is revealed, and the influence of processing parameters on laser assisted cutting effect is analyzed. An experimental study on laser assisted orthogonal turning of titanium alloy was carried out. An experimental system for laser assisted turning of titanium alloy was designed. The cutting experiments with different machining parameters were carried out, and the cutting force in the cutting process was measured. The microstructure and chip morphology of titanium alloy after laser heating were observed and analyzed. The influence of laser assisted machining on the processing state was analyzed. Finally, the rationality and accuracy of the finite element model are verified by comparing the simulation and experimental results.
【學(xué)位授予單位】:哈爾濱工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:TG51;TN249
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