COMPUTATIONAL MODEL TO DESIGN CIRCULAR RUNNER CONDUIT FOR PLASTIC INJECTION MOULD

Muralidhar Lakkanna, Yashwanth Nagamallappa, R Nagaraja

Abstract: Analytical solution quest for viscoelastic shear thinning fluid flow through circular conduit is a matter of great prominence as it directly evolvesmost efficient criteria to investigate various responses of independent parameters. Envisaging this facet present endeavour attempts to develop a computational model for designing runner conduit lateral dimension in a plastic injection mould through which thermoplastic melt gets injected. At outset injection phenomenon is represented by governing equations on the basis of mass, momentum and energy conservation principles [1]. Embracing Hagen Poiseuille flow problem analogous to runner conduit injection the manuscript uniquely imposes runner conduit inlet and outlet boundary conditions along with relative to appropriate assumptions; governing equations evolve a computation model as criteria for designing. To overwhelm Non-Newtonian’s abstruse Weissenberg-Rabinowitsch correction factor has been adopted byaccommodating thermoplastic melt behaviour towards the final stage of derivation. The resulting final computational model is believed to express runner conduit dimensions as a function of available type of injection moulding machine specifications, characteristics of thermoplastic melt and required features of component being moulded. Later the equation so obtained has been verified by using dimensional analysis method.

Keywords: Computational modelling, Runner conduit design, Plastic injection mould, Hagen-Poiseuille flow

DOI: https://doi.org/10.15623/ijret.2013.0211061