【作者】 田燕；

【导师】 肖祥芷； 李建军；

【作者基本信息】 华中科技大学 ， 材料加工工程， 2004， 硕士

【摘要】 如何使用户能够方便、有效地进行级进模结构设计,是2D级进模CAD系统需要解决的关键问题之一。现有的2D级进模CAD系统都存在一定程度上的功能缺陷,一般都不支持实时设计修改,设计效率低,因而难以满足实际设计需要。本文就上述问题进行了较深入的研究,将再设计的思想引入级进模结构设计中,以期解决这一问题。级进模结构的再设计应支持设计过程中的模具结构修改、位置修改(包括工序位置的调整和零部件位置的调整)、零件几何形状修改、以及由上述修改所引起的其它相关零件的修改。本文详细分析了级进模结构再设计的内容和特点,并采用面向对象的方法对级进模结构进行抽象描述,建立了面向再设计的级进模结构约束关系树模型。在此基础上,确定了面向再设计的级进模结构CAD系统的功能及其体系结构。根据级进模结构再设计的功能要求,通过采用变量装配设计、参数化设计和关联设计技术,解决了级进模结构再设计过程中设计结果的实时更新问题。在设计级进模结构时,当某一局部设计发生变化后,其它与之相关的设计结果将自动发生相应变化,从而保证了设计结果的一致性。基于上述理论和方法,作者开发出了相应的级进模结构CAD系统。利用该系统,用户可以方便地进行级进模总装及零部件设计,并完成设计过程中的实时修改,从而大大地提高了级进模结构设计效率。更多还原

【Abstract】 How to design the structure of a progressive die effectively has become one of the main problems to be solved in the CAD system for progressive dies. At present, most of existing 2-D CAD systems do not provide with the function of real-time modification, and are still time-consuming to design a progressive die. This thesis tries to overcome these problems by applying the redesign methodology. To support the redesign requirements for progressive dies, the functions, which can be used to modify the die structure, the positions of punch & die, and the geometric shapes of the related parts should be provided. By analyzing the characteristics of the structure of progressive dies, a constrains-based assembly tree model is put forward to represent the structure of progressive dies, and the function requirements and the architecture of the CAD system for progressive dies, which supports redesign, are discussed. By analyzing the implementation mechanism of the redesign function, the related key technologies including variable assembly design, parametric design and associated design are studied thoroughly. With the application of these technologies, the system can update quickly, which means the modification of part of the design can result in the relevant modifications of the rest parts.Based on the research mentioned above, the CAD system for progressive die structure which supports redesign is developed. With this system, designers can expediently design the structure of a progressive die and complete all the modifications during the procedure of the design, and the efficiency of designing a progressive die structure is largely improved.更多还原