基于可控拉深筋的高强板U形件回弹分析及试验研究-材料加工工程专业论文.docxVIP

重庆大学硕士学位论文中文摘要 重庆大学硕士学位论文 中文摘要 I I 摘 要 由于国家对汽车行业采取越来越严格的节能减排措施，汽车轻量化和安全性 能已成为各汽车厂家的研究重点。实现汽车轻量化和提高其安全性的措施可以从 很多角度入手。其中，在车身上尽可能多的使用高强度钢板是现在汽车行业广泛 采用的行之有效的方法之一。 高强度钢板的采用可以在减轻汽车重量的同时提高汽车的安全性能。但相对 普通车身板材其抗拉强度较高，成形工艺性差，回弹难以控制，现阶段在车身复 杂结构件上的应用还存在难度。为此，提出一种新的成形工艺方法—可控拉深筋 技术以解决高强度钢板在成形回弹控制和成形工艺性能方面的问题。 本文主要讨论可控拉深筋技术的运用对高强板U形件回弹的影响情况。首先 利用CAE软件对高强度钢板U形件在阶跃式可控拉深筋条件下的回弹进行分析并 进行试验研究，结果表明仿真分析与试验验证结果符合的较好；然后对可控拉深 筋条件下的实时变化路径进行回弹仿真分析，在约束条件和其他参数相同情况下 选取相同截面上的最大回弹量作为评价指标，通过对样本数据进行仿真得到回弹 量与变薄率，以此建立可控拉深筋运动路径参数X—输出参数Y（回弹量S与变薄 率K）的BP网络预测模型，并验证其可靠性；在此基础之上，借助遗传算法寻找 最优路径来权衡回弹量与变薄率之间的关系，使零件既具有较小的回弹又具有较 好强度。同时开发相应的用于试验研究的模具试验装置并设计实现可控拉深筋实 时运动的仿真路径控制系统，为后续试验搭建试验平台，期望能为以后进一步的 研究与工程运用提供基础数据和经验。 关键词：可控拉深筋，回弹，高强板，神经网络 重庆大学硕士学位论文英文摘要 重庆大学硕士学位论文 英文摘要 II II ABSTRACT Since the state of the automotive industry to take increasingly stringent energy-saving measures to reduce emissions, lightweight and security of the automobile has become the focus of the study of various car manufacturers. Measures of achieving automotive lightweight and improving their safety can be from a lot of perspective. Among them, the use of high-strength steel as much as possible on the car body has been proven effective methods, and widely used in the automotive industry. The adoption of high-strength steel can reduce vehicle weight while improving the safety performance of vehicles. However, compare to the ordinary body plate, it has the relatively high tensile strength, poor formability, and its resilience is difficult to control. At this stage, there are still difficult to apply to the complex body parts. Regarding this, we try to propose a new method of forming process-controllable drawbead technology to address the issues above. This paper focuses on discussing the quality of resilience of high-strength sheet (HSS) parts in the case of controllable drawbead technology. First, using CAE software to simulate different trajectories and fixed drawbead height of HSS U-shaped parts under the controllable drawbead technology