Sheet-metal parts are widely used in mass production in the automotive industries. However, stamping process planning and die design demand considerable skills and experience from designers. Reusing an existing design enhances product development efficiency. Employing the proposed CBR methodology to retrieve a problem-solving case for reuse/revision of existing process plans and die sets for automotive panels is efficient. Therefore, retrieving an appropriate case is key in the CBR methodology and has a marked impact on system efficiency. Case representation and similarity assessment are the major tasks that improve process efficiency in automotive panel manufacturing. This work applies a CBR approach with the novel indexing and retrieval strategy for automotive stamping process planning and die design. The most significant contribution of this work is that it converts a surface model of an automotive panel into a flat-bend graph for indexing and retrieval by the CBR architecture. Geometric data of the surface model are categorized into bend-type faces, flat-type faces, and holes. The groups, which are composed of connected flat-type faces, and holes are represented as graph nodes. The bend-type faces that identify the relationships between groups are represented as graph arcs. Several attributes are assigned to the nodes and arcs to thoroughly describe the model. A novel heuristic method, IMC detection, is applied to find the IMC for solving the graph-matching problem efficiently. Case similarity is acquired by finding the maximum size of IMC based on local feature correspondence using IMC detection. The CBR system is designed for surface models with a B-rep structure in the neutral STEP format on a PDM system. The system based on the proposed scheme can retrieve cases (models) similar to a query case (model). The case solutions corresponding to the retrieved case are obtained for reuse and further development. Adapting existing process plans and press die sets reduces design effort and increases production efficiency. Further work should enhance the performance of the proposed scheme in automatic adaption. Adapting a retrieved case to meet the requirements of a new stamping part automatically will further improve development efficiency. However, the proposed architecture only allows for manual modification of a retrieved process plan and die sets. For further development, automatic adaption should be considered to achieve the goal of automated design.


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    Titel :

    Representation and similarity assessment in case-based process planning and die design for manufacturing automotive panels


    Beteiligte:
    You, Chun-Fong (Autor:in) / Tsai, Yi-Lung (Autor:in) / Liu, Kun-Yu (Autor:in)


    Erscheinungsdatum :

    2010


    Format / Umfang :

    14 Seiten, 14 Bilder, 49 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





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