Computer aided design and manufacture of plasticating extruder screws for polymer processing

Fassihi-Tash, F., 1993. Computer aided design and manufacture of plasticating extruder screws for polymer processing. PhD, Nottingham Trent University.

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The work carried out throughout this study is concerned with single screw extruder screws and the application of computers in the integration of their design and manufacture (Computer Integrated Manufacture). During the course of this work, the screw manufacturing process has been examined, different mechanisms for its design and manufacture have been reviewed and the thinking behind screw add-ons were discussed. This was followed by a general review of the latest in manufacturing technology. Subsequently, and based on theses evaluations, a provisional system was proposed to suit. Within the proposed framework, a melting simulation program was chosen and the melting model reviewed. This has formed the basis of the optimisation procedure and has been integrated within a range of programs which will together form a new advanced tool for optimised design and manufacture of plasticating extruder screws. During the development phase, a program was developed to interpret the results of the rheometry test which provides the necessary information in the right format for the optimisation program. A mathematical model of the screw geometry was then analyzed to form the foundation of parametric programs which were developed on a CAD system to generate the 3D wire frame, 2D orthographic drawing and a 3D shaded model of the designed screw. This program utilises the results obtained from the optimisation program. Next, a program (Fortran) developed to calculate the set up values for the target Computer Numerically Controlled (CNC) machine. Finally, the information generated by the previous programs was used to calculate the cutter paths for the target CNC machine with considerations for its communication with the CNC machine.

This project was carried out in the belief that the right screw design in the first place will eliminate the need for expensive complex screw designs with various add-ons. It is hoped that completion of this work will provide an effective tool for polymer processors and polymer processing equipment manufacturers alike. Future work in this area would involve introduction of Artificial Intelligence and expert systems concepts as well as object orientated solutions to increase the accuracy of the model and a subsequent reduction in computing time.

Item Type: Thesis
Creators: Fassihi-Tash, F.
Date: 1993
ISBN: 9781369323191
Divisions: Schools > School of Science and Technology
Record created by: Linda Sullivan
Date Added: 01 Oct 2020 15:32
Last Modified: 22 Sep 2023 14:05

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