【作者】 胡魁；

【导师】 柳玉起；

【作者基本信息】 华中科技大学 ， 材料加工工程， 2009， 硕士

【摘要】 板料成形有限元数值模拟技术的应用,提高了汽车覆盖件的生产效率,推动了汽车工业的快速发展。但是传统的板料成形CAE软件一般都只针对单工序成形,CAD设计完成后,进行CAE分析需要数据转换,往往导致模型数据的丢失,增加数值模拟前处理的时间,影响成形模拟的精度。因此,为了满足汽车覆盖件流水线和多工序的生产需求,提高产品的生产效率,减少产品的生产成本,开发基于CAD平台的板料成形CAE系统,实现CAD和CAE技术的无缝集成,对汽车覆盖件的生产乃至整个汽车工业领域都有十分重要的意义。本课题来源于国家自然基金项目“面向自主设计的汽车覆盖件成形性快速仿真及工艺优化技术研究”(编号为50575080)和国家“863”计划“基于仿真的汽车零部件可成形性设计与工艺优化”(编号为2006AA04Z140)。课题采用CAA二次开发技术,设计和开发出基于CATIA V5平台的汽车覆盖件全工序成形仿真前置处理系统。论文阐述了CAD/CAE技术的集成现状和发展趋势,结合CATIA二次开发工具和开发环境,讨论了系统的开发框架和设计思想。通过分析传统的专用板料CAE有限元软件和全工序模拟的功能需求特点,确立了系统的总体架构和工作流程。在紧密结合生产实际和充分发挥CAD平台的优势的前提下,实现模块化操作和节点式管理的设计特点。在此基础上,解决了虚拟装配技术、参数化关联设计技术、工具网格离散技术和属性存储技术等关键问题,实现汽车覆盖件全工序成形仿真前置处理系统的所有功能。基于CATIA平台开发的板料成形全工序仿真系统,实现了CAD和CAE的无缝集成。该系统可以设置真实的摩擦、压边力、拉深筋、切口线等实际工艺条件参数,对拉延、修边、翻边等成形工序进行快速准确的模拟,并可初步实现回弹预测功能。通过对典型的汽车覆盖件多工序成形展开模拟,充分体现了系统参数化、流程化和简单化的特点,验证了系统的准确性和稳定性。更多还原

【Abstract】 The application of FEM technology in numerical simulation of metal sheet forming raises the productivity of automobile panel and promotes development of auto industry. But the current software of sheet forming analysis is always applied to simulate the single process, and needs data transition between CAD and CAE platform which trends to cause the loss of model data, increase the time of the pre-processor operation and lower the result precision of simulation. So, in order to meet the needs of flow line and multi-process production, raise the productivity and reduce costs, the development of sheet forming CAE system integrated seamlessly with CAD platform is necessary and significant to automobile production and the whole auto industry.This research is one part of NSF program named: "The Independent Research of High-speed Simulation and Optimal Process Design aiming at the Formability of Automobile Panel" (NO.50575080) and National 863 program named: "The Formability and Optimal Process Design Based on the Simulation of Automobile Parts"(NO. 2006AA04Z140). With the CAA secondary development technology, the project completed the design and the development of complete stamping process CAE pre-processor system based on CATIA V5.In this paper, the author describes the trend of CAD/CAE integration, introduces the environment and tools of CAA secondary development, and discusses the frame and design philosophy of the system. Through analysis of the special software of simulation of sheet forming, the overall structure and workflow are determined. According to the factual production, the system takes full advantage of CAD with characteristics of modular operation and node-type management. Meanwhile, the key technology such as the virtual assembly, parameterized associated design, tool mesh tessellation, attribute storage and so on has been solved. Finally, all functions of the system have been implemented.The simulation of sheet forming system based on CATIA V5 carries out the seamless integration between CAD and CAE. The system considers the influence of friction, holding force, draw-bead and other actual process conditions, can simulate drawing, trimming, flanging process, and evaluate the spring-back trend. Simulation to typical automobile panels has reflected the parameterized, simplified and modular characteristics of the system and proved its accuracy and stability.更多还原