航空薄壁件铣削加工变形分析与试验研究

【作者】 敖志强；

【导师】 吴建军；

【作者基本信息】 西北工业大学 ， 航空宇航制造工程， 2006， 硕士

【摘要】 航空薄壁件的数控加工变形是航空制造技术中影响加工精度与质量的关键因素,严重地阻碍了航空制造业的发展。因此,实现航空薄壁件加工变形的预测和控制具有重大的理论意义和工程应用价值。鉴于问题的复杂性,本文采用理论建模、软件分析和试验研究相结合的方法。 本文基于航空铝合金材料7050-T7451的机械加工性能,从金属切削原理入手,分析了航空薄壁件加工变形机理。通过四因素回归正交试验法确定了建立铣削力模型的相关常量,根据铣削力特征建立了数控加工铣削力力学数值计算模型。针对典型薄壁件铣削加工中的变形问题进行研究,分析了有限元分析的加载过程与方法。通过建立有限元变形分析模型,结合铣削加工试验,并运用ABAQUS有限元分析软件,获得典型薄壁件加工变形的基本规律,得到一些具有指导意义的结论,为提高生产率和进一步研究控制薄壁件加工变形提供了依据。 在理论分析和数值仿真的基础上,针对不同加工特征和不同几何尺寸的典型薄壁件,在不同切削参数组下进行铣削加工试验,验证了铣削力模型和有限元仿真计算模型的有效性。更多还原

【Abstract】 The distortion of Aeronautical thin-wall components due to CNC machining is the key of influencing machining precision and quality in aviation manufacturing technologies, and this problem seriously hinder the development of the aviation industry. So, it has great academic and engineering value for the prediction and improvement of Aeronautical thin-wall components machining distortion. In view of the complex feature of this problem, a method combined experiments with as well as computer analysis is adopted in this dissertation.On the metal cutting principle, this paper analyses thin-wall component machining errors mechanism for aviation aluminum-alloy material 7050-7451. Milling experiment by means of regression-orthogonal method with four factors is designed to confirm associated parameters of cutting force model. A useful milling force model is founded based on the cutting-force characteristics in end milling. The loading method and process was presented by studying machine deformation of the thin-wall components in end milling. The ABAQUS FEM codes for the founded finite element model and related experiments were used to analyze the machining deformation rules of typical thin-wall components. Same valuable conclusions were gained and it could provides good references for improving productivity and the further study of controlling machining distortion of thin-wall components.Based on academic analyses and Finite Element Simulation, in order to validate the availability of milling force model and Finite Element simulation results, Many machining experiments are arranged using different cutting parameters groups for typical thin-wall components with different geometrical shape and dimension.更多还原