不锈钢蒸发板胀形加工制造变形过程的数值模拟毕设论文.doc

PAGE 大学本科学生毕业设计（论文） 不锈钢蒸发板胀形加工制造变形过程的数值模拟 摘 要 不锈钢蒸发板的胀形加工是一个高度非线性的变形过程。采用传统的设计制造方法，费时费力，产品生产效率低、质量差、开发周期长、成本高。运用数值模拟技术来确定不锈钢蒸发板胀形加工的各项工艺参数，可以减少产品的试制和调试，降低成本。 本文在分析当前国内外胀形技术研究成果的基础上，对不锈钢蒸发板的胀形过程进行研究。采用板料成形模拟专用软件DYNAFORM对不锈钢蒸发板的胀形加工进行模。根据焊道的力学性能，本文建立了简化的有限元模型。通过反复模拟计算，选定合理的胀形压力，并解决胀形高度分布不均匀的问题，并对加载路径对板料厚度分布的影响进行了研究。 分析蛇形流道不锈钢蒸发板和蜂窝状不锈钢蒸发板的有限元模拟结果表明：蒸发板胀形高度的不均匀是由板各部分的局部刚度不同造成的； 应变速率对蒸发板的胀形高度有重要影响；蒸发板的焊接区域及其附近区域是变形的高危区域，最有可能产生成形缺陷，在加工过程中要特别注意。 关键词：不锈钢蒸发板，胀形，数值模拟，DYNAFORM ABSTRACT Bulging process of stainless steel evaporator is a highly nonlinear deformation. Traditional designand manufacturing methods are time-consuming , inefficient producti- -on, poor quality, development cycle, high costs. Numerical simulation techniques to determine various parameters during bulging process of stainless steel evaporator can reduce product testing and debugging, and thus reduce costs and improve design quality. Based on the analysis of the current domestic and international research of bulging, Bulging process of stainless steel evaporator is researched. This paper uses DYNAFOR- -M ,a sheet metal forming special software,to simulate the bulging process of stainless steel evaporator. According to the mechanical properties of weld , this paper constructes a simplified finite element model. Through simulation over and over again, a reasonable bulging pressure is selected to solve the problem of uneven bulging height. Different loading paths is used,and it is discussed that the path of the load impacts on the sheet thickness distribution. Analysis of finite element simulation results of snake-like flow stainless steel evapor- -ator and the evaporator plate honeycomb show that:It is caused by difference of the local stiffness that the bulging height of evaporator is uneven; strain rate have an important influence on the bulging height of evaporator; welding deformation region of evaporator and its vicinity is a high risk area where forming defects most likely happen. Key wor