At last , utilizing the object - oriented technology , we develop a engineer database system of die cad aiming at deficiency of the applying traditional database to engineer , introduce the logic design and architecture of engineer database system and discuss several key technologies of engineer database system 最后，针对传统数据库中工程应用中的不足之处，利用面向对象技术自行开发了冷冲模cad工程数据库系统，介绍了工程数据库系统的逻辑设计和系统的体系结构，并对工程数据库中的几个关键技术做了进一步的讨论。
On the standpoint of constraint design , this thesis first classifies die design constraints according to their features . based on the classification , and without losing general engineering sense , the thesis then proposes a die constraint information representation model , which uses templates as media and combines multiple knowledge representation methods , e . g . predicates , formulas , productions 本文从约束设计的角度出发，首先根据约束特点分类冷冲模设计约束，在分类的基础上和不失一般工程意义的前提下，给出以模板为载体，谓词、公式、产生式等多种知识表述方法相结合的冷冲模约束信息表示模型。
On the basis of this model , the thesis . further treats topics in constraint design process , such as constraint interpretation design , constraint modification , constraint control , etc . allowing for the hierarchical nature of design constraints , we bring forth a hierarchy visualization model of die constraint information 基于这种表示模型，论文首先就约束设计过程中的约束解释设计、约束编辑、约束控制等问题做了探讨，然后，依据工程约束层次性的特点，提出了一种冷冲模约束信息层次可视化模型。
