【作者】 滕焕波；

【导师】 冯再新；

【作者基本信息】 中北大学 ， 材料加工工程， 2007， 硕士

【摘要】 针对目前轿车轮毂制造中存在的问题,本文通过研究AZ31镁合金筒形件旋压工艺中工艺变形参数对旋压过程的影响,为对镁合金轮毂的旋压成形技术进行前期试验。高精度、高强度的薄壁筒形件在工业生产特别是在航空航天和汽车工业等领域中有着广泛的应用,旋压工艺是获得筒形件的一种有效方法。本文应用MSC/MARC软件对镁合金筒形件的旋压过程进行了弹塑性有限元数值模拟,获得旋压成形阶段不同时期的应力应变分布规律、变形流动规律,初步分析了失稳起皱的产生机理。数值模拟特别是有限元的应用,为旋压工艺提供了先进的分析方法。有限元法可以对成形整个过程进行模拟,有助于揭示各工艺参数对最终零件质量的影响规律,从而缩短研究周期,降低研究成本,对实验研究提供指导和帮助。通过对镁合金AZ31不同坯料状态进行组织观察和性能测试,为旋压试验提供了依据。在旋压试验过程中,分析了旋压工艺参数对成形零件质量的影响,提出了控制旋压工艺参数的方案。根据有限元数值模拟,对镁合金筒形件的旋压工艺进行了优化,并根据试验结果,分析了镁合金筒形件旋压过程中缺陷的产生机理,提出了相应的控制措施。同时,通过对AZ31镁合金旋压时金属流动过程的分析,得出了影响该合金塑性的决定性因素是成形温度和成形速度。然后通过实验对模拟结果进行了验证,结果表明:由于采用了合理的旋压工艺参数,避免了旋压中各种旋压缺陷的产生。通过对成形参数的优化设计,保证了金属的成形性能,达到了预期的目的。更多还原

【Abstract】 Aimed at the question that the car hub exists at present, have studied the influence of deformation parameters and extrusion technology parameters in the spinning caft of cylindrical workpieces of AZ31 magnesium alloy,as former experiment for magnesium-alloy car hub of spinning technique.High-precision and high-intension cylindrical workpieces are widely applied in industrial production, such as aeronautics, aerospace and automobile. Spinning is the most effective method in obtaining the cylindrical workpieces. In this dissertation,the MSC/MARC software is applied to carry out the elastic-plastic finite element numerical modeling in the spinning process of the magnesium-alloy cylindrical workpieces to get the stress-strain distribution rule,deforming flowing rule,rule in the different periods of the spinning formation stage,and later preliminarily analyze the mechanism of production of the destabilization,corrugation,and dehiscence.Numerical simulation,especially,the application of the FEM,has provided the advanced analytical methods of the spinning technique. The FEM is used to simulate the whole formation process,and is helpful to unveil the influential rules of the quality of final parts from the technological parameter,and it is also applied to shorten the research period,decrease the study cost,and provide the guidance and help in the experiments.It provides the basis for the conventional spinning experiment through the texture observation and performance testing of the different stock conditions of the AZ31 magnesium alloy.In the process of spinning experiment,it has analyzed the influence of spinning technological parameter on the end parts quality,and brought in the scheme of controlling spinning technological parameter. According to the numerical simulation and trial results,it has perfected the spinning technique,analyzed the mechanism of production of the blemish,brought in the relevant controlling measures.Meanwhile,through metal flowing process analyse in the spinning process of AZ31 magnesium alloy,influencing this decisive factor of plasticity are deformation temperature and speed. And has proved to the result of simulation through the experiment, show as a result:Because the spinning technology has adopted the rational craft parameter experemrnt, have avoided disadvantageous phenomenon in the spinning process. Through the optimization design of the mould and the metal is filled with performance better,has achieved the anticipated goal.更多还原