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  • 51.
    Stolt, Roland
    et al.
    Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Bengtsson, Sven
    Höganäs AB.
    Michael, Andersson
    Höganäs AB.
    Using property profiles to support early PM component design2010Conference paper (Other academic)
    Abstract [en]

    When designing high performance mechanical parts in PM it is the mechanical and other properties provided per unit of cost that counts for the designers. Therefore, current PM-materials standards MPIF 35 and ISO5755 are confusing since they stress the chemical composition of the powder grade rather than the properties. To clarify, the concept of property profiles is explored in this paper. The basic idea is that rather than selecting a powder grade and prescribe the density, the designer will instead select an appropriate property profile. The PM parts supplier will then understand the requirements for the PM part better and be able to propose a powder and process that will provide exactly the required properties. In addition to simplifying the material and process selection, property profiles will also favour suppliers who strive towards providing precisely the value-adding sides of the PM-part, improving the competiveness of the whole PM-business.

  • 52.
    Stolt, Roland
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design. Produktutveckling.
    Sunnersjö, Staffan
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Automatic preparation of CAD-generated solid geometry for FE-meshing2005In: NAFEMS World Congress 2005, 2005, p. 101-Conference paper (Refereed)
    Abstract [en]

    In recent years the computing power and meshing algorithms have developed to a state where FEA problems can often be solved directly using the solid geometry. However for complex geometry and complicated calculations there will for the foreseeable future be a need for geometrical idealizations.

    To reduce the time spent on making geometrical idealizations in repetitive FEA, a CAD-integrated KBES (Knowledge Based Engineering System) has been developed. The KBES creates a surface idealization from a thin-walled solid by utilizing generic modelling knowledge and by registering information about the CAD-specific features which the designer uses to define the solid geometry. From this information a corresponding surface idealization is created in the same CAD-system. This allows an updated and parametric geometry idealization of the complete CAD-geometry to be created with a degree of automation directly in the CAD-system.

    Primarily the mid-surfaces oriented in the tooling draft direction are created by evaluating the sketches which the features of the CAD-model are based on. The KBES also trims the created surfaces, thus facilitating the subsequent meshing.

    The KBES has been developed in CATIA V5 (Dassault systemes). It contains rules defined in CATIA knowledgeware which trigger sequential routines written in VBA (Visual Basic for Applications). An industrial application example where the system is used to automatically create a surface idealization for a die-cast part is also presented.

  • 53.
    Sunnersjö, Staffan
    Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
     A taxonomy of engineering knowledge for design automation2010In: Proc of TMCE 2010 Synposium, April 12-16, Ancona, Italy, 2010Conference paper (Refereed)
  • 54.
    Sunnersjö, Staffan
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    An experimental study of aspects of engineering knowledge used in engineering design: A design automation perspective2009In: NordPLM´09, Göteborg 28-29 januari 2009, Göteborg: Chalmers tekniska högskola , 2009Conference paper (Refereed)
  • 55.
    Sunnersjö, Staffan
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Cederfeldt, Mikael
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Rask, Ingvar
    A Transparent Design System for Iterative Product Development2006In: Journal of Computing and Information Science in Engineering, ISSN 1530-9827, E-ISSN 1944-7078, Vol. 6, no 3, p. 300-307Article in journal (Refereed)
    Abstract [en]

    Automated systems for variant design can be used for design iterations in order to guide the designer towards solutions that are optimized with respect to weight, cost, lead time, or other vital properties. In this work such a system for computational design problems is presented together with examples of its application. The system performs design computations, computed aided design model configuration, production process planning, and cost estimation. The design rules and algorithms are captured in knowledge "chunks," which are human readable as well as computer executable. The workflow governing the execution of these rules and algorithms is created using a dependency structure matrix (DSM) which is included in the system. Particular attention has been given to the need for transparency, modularity, and longevity of the system, which is a prerequisite for such a system to become a viable tool in industrial applications. Experiences from the proposed system indicate that the DSM workflow manager in combination with a human readable and modularized knowledge base provides clarity and transparency for both developer and user of the system.

  • 56.
    Widfeldt, Magnus
    et al.
    Swerea IVF.
    Elgh, Fredrik
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Kilbo, Per
    Swerea IVF.
    An Improved Quotation Process within Manufacturing SMEs as Part of a Strategy for Growth2008In: 2008 Proceedings of Swedish Production Symposium, November 18 - 20, 2008, Stockholm, Sweden., Stockholm: Swedish Production Academy , 2008Conference paper (Refereed)
    Abstract [en]

    This paper is generally focusing on the customer and supplier relation in a product creation perspective. The work has specifically been performed together with a metal working SME, and a main customer to this company. Four criterias for a long term succesful relationship and business success was stated from the beginning of the project: In house efficiency; Openness in the chain of suppliers; Co-operative product development and Precision of quotation. Those four areas are all covered in case studies, in close relations to the SME. The problems to combine close relationships and competitive business between customer´s and suppliers are discussed in the paper. A specific task in the project has been to create a demonstrator, a prototype quotation generator for the SME. The goal for the demonstrator was to increase precision and decrease lead times in the quotation process. An evaluation prooves that this is possible, and the demonstrator will stepwise be implemented in the SME. During the project, the SME has had a significant growth. Investments in automation and 3D CAD are made. The project is funded by Vinnova and the companies involved.

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