The effect of temperature dependent thermal properties on process parameter prediction in injection molding

Sridhar, L.; Narh, K. A.

doi:10.1016/s0735-1933(00)00113-5

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…16 In fact, the thermal properties of polymers are timedependent, and this characteristic significantly influences the analysis results. 24,25 Three-dimensional CAE simulation software tackles this problem very well, so the precise result can be obtained in comparison with applying the analytical method with constant thermal properties. Moreover, the ability of coupling with filling and packing computation, warpage and residual stress analysis as well as convenient graphical visualization are also the strong points of 3D CAE simulation.…”

Section: Systematic Procedures For Optimizationmentioning

confidence: 99%

Design of U-shape milled groove conformal cooling channels for plastic injection mold

Dang

Park

2011

Int. J. Precis. Eng. Manuf.

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Besides the solid free-form fabrication technology, milling operation is an alternative applicable method to make complex cooling channels conform to the surface of the mold cavity. This paper presents the U-shape milled groove conformal cooling channels and proposes the design optimization process in order to obtain an optimal cooling channels' configuration and target mold temperature. The relation between the cycle averaged thermal behavior of the mold cavity and the two-dimensional configuration of cooling channels was first investigated thoroughly by an analytical method. Design of experiment and 2D simulation were done to obtain the mold wall temperature and to check the feasibility of the analytical method. The optimization process of the free-form conformal cooling channels is based on the combination of both analytical method and 3D CAE simulation. The analytical step relies on explicit mathematic formulas, so it can approach the neighboring optimal solution quickly. Subsequently, the three-dimensional heat transfer simulation is applied to fine-tune the optimization results. A case study for a plastic car fender was investigated to verify the feasibility of the proposed method. The results show that conformal cooling channel gives a uniform cooling, reducing the cooling time and increasing the molded part's quality with less effort of plastic designers and high computational efficiency.

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Section: Systematic Procedures For Optimizationmentioning

confidence: 99%

Design of U-shape milled groove conformal cooling channels for plastic injection mold

Dang

Park

2011

Int. J. Precis. Eng. Manuf.

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“…Choi and Im [27] studied the deformation of injection-moulded parts using a linear, elastic, three-dimensional finite element approach. Sridhar and Narh [32] studied the effect of using temperature dependent thermal conductivity and specific heat data on the simulation of injection moulding process using C-MOLD™ software. Iyer and Ramani [33] studied the localized shrinkage in injection moulding with high thermal conductivity moulds using C-MOLD™ and ANSYS™.…”

Section: Shrinkage Warpage and Residual Stressmentioning

confidence: 99%

Modelling and verification of ejection forces in thermoplastic injection moulding

Bhagavatula

Michalski

Lilly

et al. 2004

Modelling Simul. Mater. Sci. Eng.

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Reducing cycle times in the field of injection moulding demands that parts be ejected as soon as they are dimensionally stable. It is, therefore, imperative that the ejection forces be balanced and adequate so as to reduce the probability of part deformation. In this paper, we estimate ejection forces for moulded parts that have been used by the industry, and compare these models to simulation and experimental results for a simple cylindrical sleeve.

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“…This is due to computational advances, particularly processing speeds, leading to the ability to solve complex models in relatively short times. Sridhar and Narh [5] studied the effects of applying temperature-dependent thermal properties to the polymer zone during the cooling of a plastic component. The work concentrated on the changes within the component as it cooled and solidified, and concluded that the results obtained when temperature-dependent properties were employed differed significantly from those obtained with constant thermal properties.…”

Section: Introductionmentioning

confidence: 99%

A computational model for the cooling phase of injection moulding

Smith

Wrobel

McCalla

et al. 2008

Journal of Materials Processing Technology

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This paper discusses the approaches and techniques used to build a realistic numerical model to analyse the cooling phase of the injection moulding process. The procedures employed to select an appropriate mesh and the boundary and initial conditions for the problem are discussed and justified. The final model is validated using direct comparisons with experimental results generated in an earlier study. The model is shown to be a useful tool for further studies aimed at optimising the cooling phase of the injection moulding process. Using the numerical model provides additional information relating to changes in conditions throughout the process, which otherwise could not be deduced or assessed experimentally. These results, and other benefits related to the use of the model, are also discussed in the paper.

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The effect of temperature dependent thermal properties on process parameter prediction in injection molding

Cited by 9 publications

References 2 publications

Design of U-shape milled groove conformal cooling channels for plastic injection mold

Design of U-shape milled groove conformal cooling channels for plastic injection mold

Modelling and verification of ejection forces in thermoplastic injection moulding

A computational model for the cooling phase of injection moulding

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