Aluminum alloy profile parts are widely used in the fields of aviation, equipment, automobile and ornamental industries. The construction method for "zero die trial" intelligent design system of aluminum extrusion die was studied based on KBE idea. An object-oriented knowledge language AEKL(Aluminum Extrusion Knowledge Language) was developed to construct intelligent knowledge model with three methods, frame, parameters and rules. On the aspect of knowledge reasoning, case-based reasoning was employed in addition to traditional rule-based reasoning method. API provided by CAD N17platform was used in geometry disposal. Finally, the corresponding protoyping system was established and an design example was shown.

Experiments dealing with the upsetting of sintered materials have resulted in the determination of a forming limit in terms of the local copressive and tenslis. As the specimen is comperessed, a plot of tensile strain versus compressive strain can be made. Fracture occurs when the strain parth intersects the forming limit. Once the fracture locus is defined by an experimental method, it is possible to use the Finite Element Method to determine if some upsetting operation will exhibit a free surface crack during a deformation process. In this study, a finite element program has been developed to analyze the deformation processes of sintered metals in upesetting. At the same time, products are inverstigated. The locus strains are then calualted and possible defects leading to material failure are checked. The calculated results argree well with the experimental results.

The extraction of knowledge from simulation results is becoming increasingly important, as numerical simulation is being widely used in the engineering design process. Knowledge extraction systems face challenging problems as the databases of simulation results tend to be dynamic, incomplete, redundant, sparse, and very large. This paper describes a novel approach for handling them. A consistent object-oriented data model for finite-element analysis results has been created usingEXPRESS-G, which has facilitated the construction of a database for the knowledge mining procedure. After briefly introducing Rough Sets Theory (RST) and principal component analysis (PCA), this paper investigates the capabilities andimplementation of both methods for extracting knowledge from simulation results. The methodology developed has been applied to a real application in sheet metal forming simulation and the results are presented.

Challenges and pressures from the growing globalisation of markets have made automotive enterprises shorten produce development cycle time and reduce costs throughthe increasing use of mathematics-based tools and processes. In order to bridge the gap between experience-based design and science-based engineering, this paper establishes a knowledge-based process planning system to fully support auto panel die devel-opment and design automation. The framework of this novel system, knowledge representation and knowledge-based design are desribed in detail. The function model of te system is proposed to illustrate the architecture and functiondlity of the system. The system provieds users with just-in-time access to the appropiate knowledge and information to reduce the search burden. A practial example is used to show the great advvantage of the knowledge-based process planning system.

In the present paper, a 3-D rigid visco-plastic finite-element method coupled with void damage was developed for analyzing the fine-blanking process with an ineremental implicit algorithm. Based on the Gurwon Tvergaard-Needleman plastic peoteial equation and the orthogonal rules, the effect of of void volume fraction was introduced into the material constitultive law to document the ductile damage of the deformed material. A principle of variation of rigid visco-plastic material was presented considering both the shear work and the work caused by the cahange of vloume. This proposed principle revals both the effects of equivalent stress and bydrostatic pressure. The related FEM equations coupled with void damage based on this principle of ductile fracture in the blanking process. Based on the obtained system. the fine blanking process was simulated and the onset of the micro-crack of the sheet wais predicted. Furthermore, the influence of the studied work-piece shape on the deformation process was also discussed.