Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK

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Knowledge-based integration of design and assembly process planning

1993 , Seliger, G. , Hsieh, L.-H. , Wang, Y.

Concurrent engineering is an approach for fast product development. To support concurrent product design and process planning effective tools are needed. This paper desribes the development of a knowledge-based system for this approach. lt consists of tools for feature-based product design, design for assembly analysis, and process planning. All tools work on an integrated product and process model. The integrated model and the data structure of the developed assembly-features are discussed. The perspective of using knowledge-based methods for realizing concurent engineering is described.

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Rechnerunterstützte Bereitstellung von Montageprozeßwissen für die Konstruktion

1992 , Krüger, S. , Neu, S.

The paper presents a software tool that supports design for assembly in an early design stage. It integrates a 3D solid modeller, an expert system shell and an object-oriented data base, thus providing parallel knowledge-based support in DFA through a CAD-system. At first, the paper describes an integrated information model which serves as a basis for the system development. It is structured into data models for product, process, assembly equipment and order, which has been described using the STEP-EXPRESS language. The data models have been implemented in the expert system object base. Assembly process knowledge is represented within the knowledge base in form of frames, constraints and IF-THEN-rules. Subsequent to the description of the system's architecture four application examples which are concerned with the assembly of mobile telephones are presented. These examples are optimizing of drilling hole coordinates for automated assembly of printed circuit board and telephone housing, optimizing the groove profile for automated pressing-in of a flexible gasket, the selection of standardized endeffectors and the precalculation of assembly costs.

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