Numerical simulation of the coinjection molding process

Article Abstract:

A method for analyzing the flow of two different polymer melts injected sequentially into a three-dimensional thin cavity is presented. The method relies on a numerical analysis based on a hybrid finite-element method/finite-difference method/Control-Volume numerical scheme. The fundamental parameters, such as theshear rate and thermal conductivity, are presented in terms of the governing equations for generalized Hele-Shaw flow of inelastic, Newtonian fluids under nonisothermal conditions. This method can be very useful in optimizing the design parameters of co-injection molding processes.

Innovations, Simulation methods, Simulation

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CAE of mold cooling in injection molding using a three-dimensional numerical simulation

Article Abstract:

A model is developed to simulate the cooling stage of the injection-molding process. The mold heat transfer is defined as a cyclic-steady, three-dimensional conduction. Heat transfer within the melt region is defined as transient, one-dimensional conduction while steady convective heat exchange is found between the cooling channel surfaces and coolant. The model is then integrated into a computer program to be used for the computer-aided engineering analysis of cooling systems.

Models, Usage, Computer-aided engineering, Computer aided engineering, Cooling

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Integrated simulation of fluid flow and heat transfer in injection molding for the prediction of shrinkage and warpage

Article Abstract:

Heat transfer andcompressible fluid flow in injection molding are studied to evaluate the shrinkage and warpage of an injection-molded plastic part. A hybrid finite-element/finite-difference/control-volume numerical solution based on a generalized Hele-Shaw flow for a purely viscous fluid of variable density is used in the investigation. The results show very good agreement with preliminary experimental data.

Fluid dynamics, Thermodynamics

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