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  • Emerald  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Multi-objective optimization of part- building orientation in stereolithography (1995)
    Bingley : Emerald
    Rapid prototyping journal 1 (1995), S. 12-23 
    Details
    ISSN: 1355-2546
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In rapid prototyping, such as SLA (stereolithography apparatus) and FDM (fused deposition modelling), the orientation of the part during fabrication is critical as it can affect part accuracy, reduce the production time, and minimize the requirement for supports and, thus, the cost of building the model. Presents a multi-objective approach for determining the optimal part-building orientation. Considers different objectives such as part accuracy and building time. Objective functions have been developed based on known sources of errors affecting part accuracy and the requirements of good orientations during the building of a model. The objective functions employ weights assigned to various surface types affecting part accuracy. The primary objective is to attain the specified accuracy achievable with the process. The secondary objective is to minimize the building time. Gives examples to illustrate the algorithm for deriving the optimal orientation which can assure better part quality and higher building efficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/13552549510104429
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  • 2
    Electronic Resource
    Electronic Resource
    Optimal orientation with variable slicing in stereolithography (1997)
    Bingley : Emerald
    Rapid prototyping journal 3 (1997), S. 76-88 
    Details
    ISSN: 1355-2546
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Accuracy and building time are two important concerns in rapid prototyping (RP). Usually there exists a trade-off between these two aspects pertaining to model building in RP. The use of variable thickness slicing can satisfy these two requirements to some extent. Introduces an adaptive variable thickness slicer implemented on a solid CAD modeller. The slicer employs a genetic algorithm to find the minimum layer thickness allowed at referenced height with a given cusp height tolerance. By introducing the variable thickness slicing technique, the optimal orientation for part building in RP systems is considered. Seeks to obtain the optimal orientation with adaptive slicing for part building in stereolithography (SLA) systems. Takes into consideration building time, accuracy and stability of the part when determining the optimal orientation. Results show that the proposed approach gives an effective and practical solution for building parts with curved surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/13552549710185644
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  • 3
    Electronic Resource
    Electronic Resource
    Considerations and selection of optimal orientation for different rapid prototyping systems (1999)
    Bingley : Emerald
    Rapid prototyping journal 5 (1999), S. 54-60 
    Details
    ISSN: 1355-2546
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The ability to evaluate and determine the best part building orientation for different rapid prototyping (RP) processes is important for building a satisfactory part/prototype within the limits of manufacturing time and building cost. It is also an essential step towards the identification of the most suitable RP process with a given RP application. This paper discusses the selection of building direction for four RP processes, namely stereolithography (SL), selective laser sintering (SLS), fusion deposition modelling (FDM) and laminated object manufacturing (LOM). Main differences in the four processes are first examined with emphasis on the effects of these differences with regard to the building inaccuracy, the surface finish, the manufacturing time and cost. An optimal orientation algorithm is demonstrated on a part considered for processing with one of the four RP processes. The influence of the process characteristics on the selection of appropriate orientation with different RP processes is illustrated in the example.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/13552549910267344
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  • 4
    Electronic Resource
    Electronic Resource
    Equidistant path generation for improving scanning efficiency in layered manufacturing (2002)
    Bingley : Emerald
    Rapid prototyping journal 8 (2002), S. 30-37 
    Details
    ISSN: 1355-2546
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Path generation is an important factor that affects the quality and efficiency of most laminated manufacturing processes such as SLS, SLA and FDM. This paper introduces an efficient path generation algorithm. The principle of the algorithm and its implementation are presented. A comparative study is used to analyze the effectiveness of this method. The results of comparison on both path length and processing time between the traditional method and the proposed method are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/13552540210413284
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  • 5
    Electronic Resource
    Electronic Resource
    Formation of electrical discharge machining electrode via laser cladding (2002)
    Bingley : Emerald
    Rapid prototyping journal 8 (2002), S. 315-319 
    Details
    ISSN: 1355-2546
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The feasibility of building copper-based electrodes for electrical discharge machining (EDM) via laser cladding is investigated as an application of rapid prototyping (RP). Two material systems-Cu/W (with and without nickel) and Cu/B4C (with and without nickel) in certain compositions are selected for the experimental investigation. The laser claddings are realised via a 3000?W CO2 laser with suitable parameters. The micro-structures of the electrodes are analysed with a SEM. The performance of the EDM electrodes is examined in terms of machining rate and wear rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/13552540210451787
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  • 6
    Electronic Resource
    Electronic Resource
    Benchmarking for comparative evaluation of RP systems and processes (2004)
    Bingley : Emerald
    Rapid prototyping journal 10 (2004), S. 123-135 
    Details
    ISSN: 1355-2546
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A geometric benchmark part is proposed, designed and fabricated for the performance evaluation of rapid prototyping machines/processes. The benchmark part incorporates key shapes and features of better-known benchmark parts. It also includes new geometric features, such as freeform surfaces, certain mechanical features and pass-fail features that are increasingly required or expected of RP processes/systems. The part is suitable for fabrication on a typical RP machines. In this paper, the application of the benchmark part is demonstrated using relatively common RP processes. The ability of the benchmark part to determine achievable geometric features and accuracy by the aforementioned RP processes is presented and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/13552540410526999
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