Design analysis of a lomolding machine
Date
2007-12
Authors
Goussard, Charl Leonard
Journal Title
Journal ISSN
Volume Title
Publisher
Stellenbosch : University of Stellenbosch
Abstract
This dissertation describes the design analysis of a lomolder (a machine similar to
an injection moulding machine). It focuses on key design aspects that will drive
the purchase cost of the machine and that will also influence the maintenance and
operating cost. The main objective of the study is to provide an understanding
of the key factors that influence the cost of a lomolder as well as the factors that
contributes to a quality manufactured part.
A semi-analytical flow model was developed to predict cavity pressure drops
for a range of part sizes. This model was necessary to eliminate time consuming
numeric simulations required for machine optimisation. Numerous machine concept
designs were developed and a final layout design chosen. A parametric CAD model
was built for the lomolder. Layout designs for different sized lomolders can be
generated with this model. The dissertation concludes with a cost study that
focuses on the purchase cost of a lomolder unit. Key elements such as choice of
actuator and piston to part area ratio are described.
Description
Thesis (PhD (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2007.
Keywords
Piston moulding, Thermoplastic, Cost model, Parametric design, Injection molding of plastics, Dissertations -- Mechanical engineering, Theses -- Mechanical engineering