基于模板的汽车覆盖件冲压工艺快速设计关键技术研究
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摘要
汽车覆盖件冲压工艺设计贯穿于覆盖件模具设计与制造过程的始终,为模具设计和制造提供依据,是模具设计/制造的中心环节。传统覆盖件模具存在设计/制造周期长、信息共享程度低、依靠经验设计、难以优化和生产成本高等问题。本文在探索汽车覆盖件模具快速设计/制造系统理论和实现方法的基础上,重点研究了覆盖件产品冲压工艺模板的关键技术,开发了基于模板的计算机辅助汽车覆盖件冲压工艺快速设计集成系统。全文共七章,其主要研究内容如下。
    1、分析了覆盖件冲压工艺设计的国内外研究发展现状,评述了覆盖件冲压工艺设计的关键技术及其发展趋势,阐述了课题的研究意义及主要研究内容。
    2、深入分析了传统覆盖件模具设计/制造过程及存在问题,提出了解决对策,构建了覆盖件模具快速设计/制造系统框架。针对覆盖件产品冲压工艺设计特点,研究了基于模板的覆盖件冲压工艺快速设计方法,建立了面向对象的冲压工艺模板信息模型、基于模板的覆盖件冲压工艺快速设计功能模型及其快速设计过程。
    3、研究了基于覆盖件产品功能及其几何拓扑信息的相似性原理,实现冲压工艺模板创建技术。阐述了基于实例的冲压工序模板和型面模板的创建过程。基于型面的分层描述,构建了基于特征的型面模板分层结构。
    4、研究了基于模板实例化的覆盖件产品冲压工艺设计的关键技术及其实现方法。定义了覆盖件产品特征定义数据模型,建立了产品特征属性图。基于产品特征属性图比较,以产品间的相似度选择冲压工艺模板,实现冲压工艺模板实例化。
    5、研究了基于几何分析的覆盖件拉延模工艺补充面快速设计方法。分析了工艺补充面的设计现状与存在问题,提出了广义工艺补充面的概念,基于实例分析,建立工艺补充面设计的几何要素和产品几何信息之间的关系模型。基于此模型,建立了工艺补充面设计知识库以支持工艺补充面定量设计。
    6、研究了基于成形性分析的型面优化设计技术。针对型面结构的设计特点,使用DYNAFORM软件,基于成形性分析,提出通过型面结构设计变量的不同取值,寻找设计变量对成形性的影响规律,以确定其最优值或优化范围。
    7、基于UG设计平台及其二次开发工具,使用面向对象的开发工具VC++和关系数据库SQL Server,开发了基于模板的覆盖件冲压工艺快速设计集成系统。
The automobile panel stamping process design is very important in both the design and manufacture of the panel dies. It provides the design and manufacture process with necessary information and is the key of the design/manufacture of the panel dies. There are many disadvantages of traditional panel dies design/manufacture, such as time-consuming, low information sharing, experience-based, difficulty of optimizing, high cost and so on. Based on the research of the rapid design/manufacture theory and methods of the automobile panel dies, the paper focuses mainly on the key techniques of panel stamping process template and develops the rapid computer-aided template-based automobile panel stamping process design system. The dissertation has seven sections, their main contents are as followings:
    The present studies of the panel stamping process design at home and abroad are analyzed. Key techniques and trend of development of the panel stamping process design are summarized, and the goals and contents of the project are put forward.
    Traditional panel dies design/manufacture method and their deficiency are analyzed in detail. The solution is put forward, and the frame of the rapid panel dies design/manufacture system is constructed. According to the characteristics of the panel stamping process design, a template-based panel stamping process design method is studied. A object-oriented stamping process template information model and rapid template-based panel stamping process design function model are built, and its rapid design process is discussed.
    Based on similarity principle of the panel function and its geometry-topology information, the method of building stamping process templates is studied, The constructing process of the case-based stamping process template and die-face template is explained in detail. Based on the hierarchical description of the die-face, the feature-based die-face template hierarchy structure is built.
    The key techniques and initialization methods of the template-based panel stamping process design are studied. The feature definition data model of the panel is defined and its feature attribute graph is given. Based on the similarity between panels computed by the match of the feature attribute graphs, a stamping process template is selected, and its initialization is obtained.
    The rapid design method of geometry-based panel draw dies addendum is studied. The present study and problems of addendum are analyzed and the concept of generalized addendum is presented. On the basis of analyzing cases, the model of the relationship between addendum geometric factors and product geometric data is built. Based on this model, a addendum knowledge base is built to support quantitative rapid design of addendum.
    Die-face optimum design technique based on formability analysis is studied. Considering the design characteristic of the die-face and based on the formability analysis, DYNAFORM is used to seek the influent regularity of design variables
    
    
    on the formability by changing the main structure design variables of the die-face, and the optimum value or optimum range is got.
    Based on UG platform and its secondary developing tool, using object-oriented development tool VC++ and relational data base SQL Server, the rapid integrated design system of template-based panel stamping process is developed.
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