超薄矩形电池壳体成形工艺数值模拟及试验研究

【作者】 李伦根；

【导师】 谢谈； 张小光；

【作者基本信息】 机械科学研究院 ， 材料加工工程， 2003， 硕士

【摘要】 矩形壳体零件的应用十分广泛，其典型代表是作为便携式信息终端等移动通信类产品的铿离子电池壳体。由于这类产品的轻与薄的适用性要求，对电池壳体成形的工艺和方法提出了越来越高的要求。 论文对锂离子电池壳类零件的两种成形工艺进行了数值模拟，优化工艺参数，并以此指导模具设计，进行了工艺试验。 论文首先研究了矩形壳体零件反挤压的重要参数—反挤压凸模的高／宽比。通过二维有限元数值模拟，得到了凸模高／宽比对壁厚影响的临界值。结合模具设计的经验，推断出了反挤压成形矩形壳体零件的临界高／宽比。 其次，论文对反挤压零件的工艺参数进行了优化。采用数值模拟和正交试验相结合的方法，从而降低了模拟的盲目性，大大提高了优化的效率。并首次进行了反挤压+变薄拉深的三个变形阶段的连续数值模拟，非常直观地预示了整个工艺过程。 接着，论文用优化的工艺参数对电池壳体零件的反挤压+变薄拉深成形工艺做了试验，归纳了反挤压和变薄拉深的模具设计要点和经验。其中用到了本课题组的专利技术。 最后，论文对拉深+变薄工艺进行了成形工艺设计和数值模拟，并设计制造模具进行了相应的成形试验。 总之，本论文以建立模型——计算机数值模拟——工艺优化——工艺试验检验为研究思路，对电池壳体零件的成形工艺进行了较为系统的研究，并用试验验证的方式证明工艺的可靠性。紧密结合实际是本论文的一个研究特色。更多还原

【Abstract】 Rectangular shell parts are widely used in industry and our daily lives, especially used as the cover of Li-ion battery, which is a main component of portable intelligence terminal products. With the development of these mobile communication products to be much lighter and thinner, it makes demands on the formation technology and method of Li-ion battery cover.In this paper, two kinds of Li-ion battery cover formation methods are simulated and the optimized parameters are given out. Under the direction of the simulation results, the dies are designed and the technology experiments are done.The depth-width ratio of the backward extrusion male die, which is an important parameter of rectangular shell parts backward extrusion, is studied in the beginning part of the paper. The critical value is gotten through the two-dimensional simulation results, which reflects the impact of the male dies’ depth-width ratio on the wall thickness. Combination with the design experience, the critical value depth-width ratio in the backward extrusion formation of rectangular shell parts is concluded.In the second part of the paper, the technology parameters of backward extrusion parts are optimized. Adopting numerical simulation and orthogonal tests, the optimization efficiency is improved greatly and the simulation blindness dropped down. The continuous simulation of backward extrusion and ironing is first given out in this paper, which predicts the whole technology procedure visually.Based on the optimized parameters, the backward extrusion and ironing formation technology experiment of shell parts is done. The die design gist and experience are concluded, which uses the patent of our research group.In the end of the paper, the formation technology design and simulation of drawing and ironing are given out. The dies are designed and checked out.Generally speaking, following the way of modeling, numerical simulation, technology optimization and experiments, the paper studies the formation technology of battery cover parts systematically and experiments are done to test the reliability of this technology. Connecting closely with reality is a noticeable character of this paper.更多还原