Commom Database Platform-based Design Support System For Complicated Parts Hot Forging

Process and die design is the core step in the development of forging products because it directly affects the quality, cost and manufacturing efficiency of the final products as well as the life of forging die. In the environment of the severe competition and market globalization, how to improve the quality of forging process and die design, improve the level of intellectualization and design efficiency and ultimately leap from experiential design to scientific design are long-time goal of researchers. Modern production requires short-cycle, high-quality, low-cost of forging die development, therefore, it is an inevitable trend in the field of design to introduce advanced design theories and methods as well as computer technologies, particularly artificial intelligence (AI), CAD and database technology into the traditional hot forging process and die design. Based on the three technologies above, a design supporting system for complicated part hot forging is built on a commom database platform. Knowledge representation in system database, Object-oriented design methods, massage passing mechanism through general database bus, as well as how to develop a intellectual system which can design all kinds of complex forging parts regardless of their geometry are researched in this thesis.Reviewed CAD/CAM/CAE and knowledge based engineering (KBE) technologies used in hot forging design in the world, a hot forging process and die design supporting system is built on a common database platform. The overall framework of the system, flowchart of the system's design part, as well as data flow and detailed frame of hot forging design system knowledge-base are given.Using object-oriented design methods, hot forging process and die design is divided into several objects and sub-objects according to their design tasks and knowledge modules. The functions of these objects are detailed exposed. Meanwhile, knowledge based intellectual supporting functions of the system are introduced. Features and innovative point of the system are embodied in the explanation of system function.A commom database platform is built. A unified design knowledge representation structure, which combines frame and object-oriented representation method, is proposed. Two new methods used in this system,"object-oriented design method in whole system level"and"massage passing mechanism through general database bus", make the design system and database, as well as different objects"Dynamic related and static independent". This thesis illustrates that the system can design all kinds of forging parts regardless of their geometry by three new design methods:"combination of process deduction and feature modeling","incorporate common points while reserving difference"and"knowledge guides design, case assists creation".On the basis of the theories analyzed above, a hot forging process and die design supporting system is built on a commom database platform, using Visual C++.net, SQL Server and UG Open API. Through analyzing hot forging process and die design of leverage, the system's utility and reliability are verified.