薄壁叶片精密数控加工变形分析与控制技术本科毕业设计.docVIP

 摘 要 在航空航天工业中，数控铣削是薄壁零件加工的一种典型加工工艺，其中尤以高速铣削应用最为广泛。然而，由于这些结构件的薄壁地刚度特征，实际加工过程中工件和道具变形引起的加工误差严重影响着工件的加工精度及表面质量，甚至造成零件的保费。因而，研究薄壁铣削过程加工变形的预测及控制，对实现制造也中的加工工艺方案和加工参数的合理选取优化既有重要意义。为此，本文以薄壁件侧铣加工过程为研究对象综合运用怯薛基本原理、有限元数值模拟技术以及数控加工技术，对加工变形预测方法和补偿策略进行研究，具体工作包括： 薄壁叶片的UG建模，和从UG 导入ANSYS软件。 建立刘文螺旋立铣刀铣削加工的力学模型。在分析铣削加工特点的基础上，建立了铣削力系数与切削用量的多项式模型，并用四因素回归正交实验法确定了模型常量。最后，用过实验验证了该力学模型的正确性。 针对航空叶片侧铣加工变形进行了有限元数值模拟分析，提出了变形补偿策略。在分析叶片曲面曲面特征的基础上，运用坐标变换实现铣削力的计算及有限元模型的加载，得到了被加工表面的形状误差数据。在此基础上，有提出了利用变形模拟值修正刀轴适量补偿叶片加工变形的刀轨优化策略。 综上，本文的研究为解决薄壁件侧铣加工的变形问题提供了有效的误差补偿方法，为提高加工质量、降低成本、提高机床的利用率提供了有效的途径，同时为后续深入研究奠定了理论基础。 关键词：UG建模；薄壁叶轮；有限元分析；误差补偿 ABSTRACT In the aerospace industry, CNC milling is thin a typical parts machining processing technology, especially the most widely used high speed milling. However, due to the characteristics of thin-walled structure to stiffness, the actual process of workpiece and props processing error caused by deformation of the serious influence workpiece machining precision and surface quality, even cause components of the premium. Therefore, study machining deformation of thin-walled milling process to realize forecast and control, the manufacturing process scheme and processing parameters optimized rational selection of both the important meaning. Therefore, this article takes the thin-walled package flank milling process for research object comprehensive use of timid uzziel basic principle, the finite element numerical simulation technology and nc machining technology, machining deformation prediction method of study, compensatory strategies and concrete work include: Thin blade, and the UG modeling from UG import ANSYS software. Establish liu wen mill cutter milling spiral mechanical model. On the analysis of milling characteristics is established, on the basis of milling force coefficients of polynomial model with cutting dosages, with four factors regression orthogonal experimental method is used to determine the model constants. Finally, used experimental re