【作者】 刘辉；

【导师】 柳玉起； 章志兵；

【作者基本信息】 华中科技大学 ， 材料加工工程， 2015， 硕士

【摘要】 三维CAD系统已经在汽车模具设计中广泛应用,提高了模具设计效率和质量。但这些通用的CAD系统只提供常见的建模工具,没有集成每个模具企业设计标准。设计人员在模具设计过程中需要手工查表计算,费时费力,很难做到规范统一,无法保证模具设计质量。因此,开发一套集成模具企业设计标准的覆盖件模具设计系统,同步指导模具设计是非常有必要的。论文分析了某汽车企业的覆盖件模具设计标准和设计流程,在此基础上对覆盖件模具设计系统的需求和功能进行了详细的分析,并针对传统单机设计模式在管理和维护设计标准方面存在的问题,提出了基于C/S(客户端/服务器)架构的覆盖件模具标准化设计方法。该方法能使企业标准同步指导模具设计,不再需要设计人员手动查阅标准,能提高设计效率和降低出错率。论文针对覆盖件模具标准化设计系统关键技术进行了深入研究。为了使系统具有较好的兼容性、可扩展性和可维护性,采用结构化的模板管理结构树和BOM相关标准。在标准件库子模块中,采用参数化建模技术和关联参数表格方法创建标准件模型,解决了传统标准件库建库繁琐问题;采用“用户特征”方法封装标准件设计过程,使其对用户不可见,解决了标准件建模技术泄密问题;采用多叉树的存储结构和自动版本检查方法,方便用户快速查询并保证标准件版本一致性。针对一般BOM系统对非标锻件坯料估算不准确且耗时的问题,提出了非标锻件自动备料算法。该算法将零件实体离散为表面点集,通过求离散点集的最小凸包包容盒来计算锻件坯料尺寸,计算准确且效率高。通过研究基于C/S架构的覆盖件模具标准化设计方法及其关键技术,开发了汽车覆盖件模具标准化设计辅助系统SDAS(Standardized design assistant system)。SDAS系统以模具设计标准模板为基础,包含了模具结构管理、标准件库和BOM三个子模块,能够自动创建和管理模具结构装配树、快速检索与装配约束标准件和自动生成BOM表,减少设计人员的工作量,提高设计效率。论文最后以某企业实际模具设计为例,利用本文开发的覆盖件模具标准化设计系统辅助设计了整套模具,验证了本系统较好的兼容性和实用性。更多还原

【Abstract】 3D CAD system has been widely used in automobile die design and improved its efficiency and quality. These broadly applicable CAD systems only provide common modeling tools and do not specify die enterprise design standard. A lot of time and energy is wasted on looking up tables and calculating for the application of these systems. It is difficult to standardize the workflow and guarantee the die design quality. Therefore, it is necessary to develop an automobile die design system integrating the die enterprise design standard and guiding the die design synchronously.The paper analyzed the automobile panel die design standard and process of an automobile enterprise, and sorted out the requirements and functions of the automobile die design system based on the analysis. And specific to the problems in management and maintenance of design standards in the traditional off-line mode, automobile panel die standardizing design method based on C/S(client/server) framework was. This method can use the standard to guide the design synchronously in the design process, make designers be free from the continuous manual consulting the standard, and improve design efficiency and reduce error rate.The paper studied the key technology of automobile panel die standardizing design method. To enhance the compatibility, scalability and maintainability of the system, structured templates were applied on the management of assembly structure tree and BOM related standards. In standard parts library module, parametric modeling technology and associated parameter table were used to create standard part model, and solved the problem of cumbersome library building task met in traditional standard parts library; “user feature” method which can encapsulate standard part design process and make it invisible to users was used to prevent modeling technology information leaking; Multiple tree storage structure and automatic version checking method were used to make user query fast and conveniently and ensure version consistency. An algorithm of non-standard forging stock was proposed to deal with the inaccuracy in estimating non-standard forging blank and time-consuming problem in general BOM system. The algorithm discrete the part model into surface point set firstly and acquire forging stock size by calculating bounding box of the minimum convex hull of point set. It has high accuracy and efficiency.Based on the study on automobile panel die standardization design method applying C/S framework and its key technologies, automobile panel die standardized design assistant system(SDAS) was developed. SDAS consist of three module: the die structure management, the standard parts library and BOM. It can automatically create and manage die structure assembly tree, fast retrieve and assemble standard part, and automatically generate BOM. It can reduce workload of designer and improve the design efficiency.The paper ends with a practical die design as an example. SDAS was used in the design process and the result verified the good compatibility and usability of the system.更多还原