Optimum tolerance synthesis of simple assemblies with nominal dimension selection using genetic algorithm
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Optimum tolerance allocation plays a vital role in minimization of the direct manufacturing cost, and it is sensitive to tolerances related to variations in manufacturing processes. However, optimal adjustment of both nominal dimensions and selection of tolerances may further reduce assembly manufacturing cost and wastage of materials during processing. Most studies in existing literature focus on optimum tolerance allocation for the assemblies without considering nominal dimension selection. The method proposed in this work uses genetic algorithm techniques to allocate tolerances to assembly components, thereby minimizing costs. The component alternate nominal dimensions are predicted based on critical dimensions and its tolerances. The effectiveness of the developed algorithms demonstrated using randomly generated problems as well as sample problems taken from the literature. Test results are compared with those obtained using the Lagrange multiplier method. It is shown that by adjusting the nominal dimensions, the proposed method yields considerable savings in manufacturing costs.
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Multi-objective optimization for optimum tolerance synthesis with process and machine selection using a genetic algorithmGeetha, K.; Ravindran, D.; Siva Kumar, M.; Islam, Mohammad Nazrul (2012)This paper presents a new approach to the tolerance synthesis of the component parts of assemblies by simultaneously optimizing three manufacturing parameters: manufacturing cost, including tolerance cost and quality loss ...
Geetha, K.; Ravindran, D.; Kumar, M.; Islam, Mohammad Nazrul (2015)Traditionally, tolerance allocation and scheduling have been dealt with separately in the literature. The aim of tolerance allocation is to minimize the tolerance cost. When scheduling the sequence of product operations, ...
Geetha, K.; Ravindran, D.; Kumar, M.; Islam, Mohammad Nazrul (2015)© 2015 Elsevier Ltd. Traditionally, tolerance allocation and scheduling have been dealt with separately in the literature. The aim of tolerance allocation is to minimize the tolerance cost. When scheduling the sequence ...