【作者】 马艳；

【导师】 刘二亮；

【作者基本信息】 哈尔滨理工大学 ， 机械制造及其自动化， 2014， 硕士

【摘要】 钛合金Ti6Al4V以其优越的性能被广泛应用于各个领域中，以钛合金为材料的零部件主要应用于机构的重要部位，因此对钛合金零件的使用性能和表面质量要求很高，例如工件的疲劳强度、使用寿命等。本文从影响已加工表面残余应力的因素入手，建立影响已加工表面残余应力的等效热力-载荷模型，进而对钛合金Ti6Al4V的已加工表面残余应力进行预测，主要研究工作如下：首先，以金属切削理论和热-弹塑性变形理论为基础，研究切削力和切削热对已加工表面残余应力的影响；分析切削力-热载荷在刀-屑接触面以及刀-工件触面的热力分布形式，并对载荷简化加载方法进行研究；对切削过程的切削力及刃口区域的犁耕力进行分解，建立切削力与热源摩擦系、切削温度与数热流通量、以及切削力与等效应力之间的关系，进而建立已加工表面残余应力预测等效热-力载荷模型。然后，进行切削过程力热载荷分布有限元仿真分析，研究简化载荷的可行性；根据研究结果，进行等效载荷模型热源摩擦系的量化试验以及残余应力测试试验；建立已加工表面残余应力等效热力载荷仿真模型，并通过已加工表面残余应力测试试验验证有限元模型的可靠性。最后，进行刀具的磨损对残余应力影响规律研究，通过对刀具磨损形貌的分析，研究磨损刀具形状和尺寸的改变对已加工表面残余应力的影响；从刀具磨损几何形态入手并结合有限元软件，建立刀具磨损对已加工表面残余应力影响的有限元模型，实现刀具磨损对已加工表面残余应力影响的有限元建模分析。更多还原

【Abstract】 Titanium alloy Ti6Al4V with its superior performance has been widelyapplied in various fields, the material for titanium alloy parts is mainly applied toimportant parts of the mechanism.Therefore, it is very high that the use oftitanium alloy parts performance and the surface quality requirement,such asfatigue strength and the service life of workpiece and so on. This article startswith the affect of the residual stress on the machined surface, establish theequivalent thermal-force load model of residual stress which affects themachined surface, and predicts the residual stress in machined surface oftitanium alloy, the main research work as follows:First, according to the theory of metal cutting and thermal elastic-plasticdeformation theory as the foundation, the effect of cutting heat and cutting forceon machined surface residual stress has been studied; Analysis of the cuttingforce and chip thermal load in the tool-chip interface and tool-workpiece surfacethermal distribution form, the methods of simplify the load were studied;Decomposite the cutting force of cutting process and cutting edge area of ploughforce，build the relationship among the cutting force and friction heat sourcecoefficient, cutting temperature and heat flux, and the relationship betweencutting force and equivalent stress, then set up machined surface residual stressof the equivalent thermal-force load mode.And then, it will carry out finite element simulation analysis of forcethermal load distribution of cutting process of, study the feasibility of thesimplified load; According to the results of the research,conduct a test ofequivalent load model of heat friction and residual stress; Build machinedsurface’s model of residual stress equivalent thermal load simulation, andthrough the machined surface residual stress testing experiment verify the reliability of the finite element model.Finally, to research on the influence laws of the tool wear effect on residualstress, through the analysis of tool wear morphology,study on the change ofabrasion tool shape and size has the influence on surface residual stress; Fromthe perspective of the tool wear geometry and combined with the finite elementsoftware, set up on the impact of tool wear on finished surface residual stressfinite element model, then realization of finite element modeling and analysis ofthe tool wear on the machined surface residual stress effects．更多还原