Browsing by Author "De Swardt, A. V."

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    Design for manufacture through fabrication : a manufacturing time and cost estimation model for large fabricated assemblies
    (Stellenbosch : Stellenbosch University, 1998) De Swardt, A. V.; Basson, A. H.; Stellenbosch University. Faculty of Engineering. Dept. of Mechanical & Mechatronic Engineering.
    ENGLISH ABSTRACT: This thesis concerns the development of manufacturing time and cost estimation models for large mechanical engineering assemblies. The objective of the time and cost models are to serve the design engineer as a tool for estimating manufacturing time and cost, as the design progresses from the conceptual to the detail design stage. The manufacturing time and cost estimation models will give the designer the advantage of evaluating different concepts with time and cost as decision making criteria. The models can also be used as a redesign tool for existing products so that a cost comparison can be made between the existing and new design. The models can also be used as a design optimisation tool for the manufacturing time and cost of a new design or redesign. This will reduce unnecessary costs associated with a certain design Basic process flow diagrams were determined from shop floor practice for each manufacturing process and its secondary process( es). Data for these models were obtained by time studies. The time study data was then used to investigate correlation's between manufacturing time and certain design parameters. Manufacturing time estimation formulae were then developed from the time study data. Five major time and cost estimation models were developed and tested. The five models are: Welding Time Estimation for the Flux Core Arc Welding Process, Tack Welding Time Estimation, CNC Flame Profile Cutting Time Estimation, Manual and Mechanised Bevelling Time Estimation and Plate Bending Time Estimation. Each model depicts the manufacturing time and consumable requirements.