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| Flow simulation for injection molding based on solid model |
| Revised:April 22, 2002 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20041023 |
| KeyWord:viscous and incompressible fluid,mid-plane model,solid model,hele-Shaw flow,finite element,taylor expansion |
| Cao Wei Shen Changyu+* |
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| Abstract: |
| A new method is proposed for the flow simulation of injection molding based on solid model by applying mid-plane technique. The two dimensional mesh is constructed by meshing the solid surfaces, coupling the nodes along the thickness direction and adding the imaginary hot runners to connect the coupling nodes. The mathematics model for mid-plane flow analysis is in terms of generalized Hele-Shaw flow for the viscous, incompressibility, non-Newtonian fluid under non-isothermal conditions in the present investigation. The moving fluid description is transformed into a transport equation about fill factor in the whole domain to be filled. The pressure field is obtained by the finite element method, the temperature field is determined by the finite difference method and the fill factor is calculated by high order Taylor expansion at each time-step. The technology keeps the flows in the surfaces at the same section coordinative. It combines the reliability of mid-plane and the convenience of CAD. Most importantly, the conventional CAE can be integrated with CAD tools by the technology without fissure. For verification of the numerical results obtained from the developed program, the simulation results are compared with the experimental results obtained from the test mold set designed by Han in the current study using the same commercial-grade PP and process conditions as Han. Comparisons are also carried out between mid-plane and solid model. Based on the comparisons, it is found that the currently method is useful for simulations of flow in injection molding based on solid model. |
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