筒形件强力旋压成形关键参数对成形质量影响分析及其优化

发布时间：2018-03-23 10:35

本文选题：筒形件　切入点：旋压　出处：《浙江大学》2015年硕士论文

【摘要】：在高精度薄壁筒形件加工领域,旋压加工技术作为一种特殊加工,由于其有着无屑加工、产品尺寸精度高、综合性能好等优势,其受到的关注度越来越高,在很多国民经济的重要部门,比如航空航天、国防军工、甚至家用器具等方面都占据着举足轻重的地位。同时,筒形件强力旋压属于大变形的塑性成形过程,其成形机理复杂,并且成形质量受诸多工艺参数的影响。随着现代旋压筒形件的需求的日益增多,为了获得更优质的工件,如何优化旋压成形过程各个工艺参数已成为筒形件强力旋压的重要研究点。本文的主要研究内容如下：指出了本课题的研究背景和意义。概述了旋压技术的原理和特点,介绍了筒形件强力旋压的主要问题,旋压成形技术的分类、研究方法和研究内容,综述了旋压技术国内外的研究现状,并引出了本文要研究的主要内容。筒形件强力旋压模型的构建。分析了有限元计算的理论方法、旋压过程的三个阶段和三个变形区域,指明变形过程中的金属塑性流动情况。利用ANSYS/LS-DYNA显式动力学仿真平台建模,改进建模方法,在建模过程中考虑旋轮摩擦产生的自转和转动惯量,旋轮加载方式为沿轴向移动而不再采用旋轮螺旋形进给方式,约束坯料起始端节点自由度,使其与实际情况中坯料起始端金属塑性流动相符,最后验证模型的有效性。提出筒形件强力旋压成形质量综合指标。揭示旋压力变化趋势与工件变形的关系。分别提取工件内外层单元三向应变随旋压过程的变化规律,说明应变类型及其变化规律与坯料材料变形情况的关系。分析壁厚沿轴线方向的分布,解释工件壁厚与成形质量及缺陷产生的联系。获取不同旋轮参数对工件成形质量的影响,在此基础上进行了工艺参数的研究及优化。获取不同形式旋轮适合的材料及各自对成形质量的优缺点,选择合适的旋轮对关键工艺参数进行研究。应用Taguchi正交设计方法研究了筒形件强力旋压过程中进给率(F)、主轴转速(S)以及旋轮成形角(α)关键参数对工件质量的影响,获取最优参数组合。最后对本文研究内容进行总结和展望。
[Abstract]:In the field of high-precision thin-walled cylindrical parts processing, spinning processing technology as a special processing, because of its non-chip processing, high dimensional accuracy, good comprehensive performance and other advantages, its attention is getting higher and higher. In many important sectors of the national economy, such as aerospace, national defense, military industry, and even household appliances, they all play a pivotal role. At the same time, the strong spinning of cylindrical parts belongs to the plastic forming process of large deformation, and its forming mechanism is complex. And the forming quality is affected by many technological parameters. With the increasing demand of modern spinning cylindrical parts, in order to obtain higher quality workpiece, How to optimize the process parameters of spinning process has become an important research point of the strong spinning of cylindrical parts. The main contents of this paper are as follows: the research background and significance of this subject are pointed out, and the principle and characteristics of spinning technology are summarized. This paper introduces the main problems, classification, research methods and contents of spinning technology for cylindrical parts, and summarizes the research status of spinning technology at home and abroad. The main contents of this paper, the construction of the force spinning model of cylindrical parts, the theoretical method of finite element calculation, the three stages of spinning process and the three deformation regions are also introduced. The plastic flow of metal in the process of deformation is pointed out. Using ANSYS/LS-DYNA explicit dynamic simulation platform, the modeling method is improved, and the rotation and moment of inertia produced by friction of rotary wheel are considered in the process of modeling. The loading mode of the rotary wheel is moving along the axial direction instead of adopting the spiral feed mode of the rotary wheel, which restricts the degree of freedom at the beginning end of the blank, and makes it accord with the metal plastic flow at the beginning end of the blank in the actual situation. Finally, the validity of the model is verified. The comprehensive quality index of the strong spinning forming for cylindrical parts is proposed. The relationship between the changing trend of the spinning pressure and the deformation of the workpiece is revealed. The variation law of the three-way strain of the inner and outer layer elements of the workpiece with the spinning process is extracted respectively. The relationship between the strain type and its variation law and the deformation of the blank is explained. The distribution of the wall thickness along the axis is analyzed, and the relation between the wall thickness of the workpiece and the forming quality and defects is explained. The influence of different rotary wheel parameters on the forming quality of the workpiece is obtained. On this basis, the process parameters are studied and optimized. The materials suitable for different forms of rotary wheel and their advantages and disadvantages for forming quality are obtained. Using Taguchi orthogonal design method, the influence of feed rate (FN), spindle rotation speed (S) and rotary wheel forming angle (伪) on the quality of workpiece is studied by means of Taguchi orthogonal design. The optimal parameter combination is obtained. Finally, the research content of this paper is summarized and prospected.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG306

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