【作者】 李玉强；

【导师】 杨合；

【作者基本信息】 西北工业大学 ， 材料加工工程， 2002， 硕士

【摘要】 现代旋压技术是广泛应用于航空、航天、军工等金属精密加工技术领域的一种先进塑性成形工艺，已成为小批量、多品种回转型薄壁壳体零件的重要加工方法。了解和掌握多道次普旋的成形规律是旋压技术研究和发展中迫切需要解决的关键问题。为此，本文以多道次普旋中代表性加工方式——筒形件拉深旋压为研究对象，采用计算机数值模拟和理论分析相结合的方法对其成形规律进行研究，主要研究内容和结果如下： 通过对多道次拉旋成形特点进行分析，采用四节点四边形轴对称单元实现了计算模型的离散化，有效地处理了旋轮加载和边界约束等条件，从而建立了符合实际的多道次拉深旋压弹塑性有限元力学模型；采用能量法推导出了起皱临界压应力计算公式，为多道次拉深旋压稳定成形过程的数值模拟提供了依据。 在旋轮运动轨迹为直线的条件下，对多道次拉旋成形过程进行有限元模拟，获得了不同进给量、不同道次以及不同工艺参数下的应力和应变分布规律，为旋压工艺条件的选择与优化提供了依据。 对不同旋轮运动轨迹曲线控制参数几何关系进行分析，给出了控制参数的计算方法；通过对不同旋轮运动轨迹与不同道次下拉旋过程进行数值模拟，提供了从应力与应变分布的角度选择多道次普旋旋轮运动轨迹的方法。更多还原

【Abstract】 Modern spinning technology, an advanced plastic forming process widely used in aerospace and military industry, has become an important shaping method for flexible manufacturing of small-lot rotary thin shells. To ascertain the forming law of multi-process conventional spinning is a key problem urgently to be solved for the development of spinning technology. So, in this dissertation, the forming law of multi-process draw-spinning which is a typical method in multi-process conventional spinning, was investigated with computer numerical simulation combining with theoretical analysis. A brief introduction to the project and its main results are as follows:Based on analysis of the forming characteristics of draw-spinning, the four-node quadrilateral axial-symmetric element is used for discreting the blank, and some methods to treat loading and dynamic boundary conditions effectively have been proposed, then, a mechanical model corresponding to reality is established for elasto-plastic FEM simulation of multi-process draw-spinning. According to the principle of the energy method, an equation for critical compressive stress of bulking during draw-spinning process was deduced to provide a criterion for stable forming of multi-process draw-spinning.At the condition of roller motion trace being straight line, the forming process of multi-process draw-spinning is simulated with FEM, and under the condition of various pass, amount of feed, and processing parameters, the regularities of distribution of stress and strain is obtained. Which provide a reference for the choice and optimization of technological conditions of spinning.Based on the analysis of geometrical relationship between controlling parameters of different roller motion traces, a method of calculation ofThe project is supported by the Aeronautical Science Foundation of China(grant No OOH53075). And the Foundation of National Key Laboratory of Defense Science and Technology of China (grant No 98JS61.2.1 .HK03 14)controlling parameters is gained. The multi-process draw-spinning under different pass and roller motion traces is simulated. The results of distribution of stress and strain can be used as a guide for choosing roller motion trace of multi-process conventional spinning.更多还原