| STRESS ANALYSIS OF INJECTION MOLDED PARTS IN POST-FILLING STAGE |
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| 摘 要： | 0 INTRODUCTIONThe wmpage of injection molded parts is a difficult problem to the mold designers. There are manyfactors that cause Warpage, such as the technics of injection molding, the designing of mold and thematerial Of mold, etc. Inappropriate parameters of those factors can cause differential shrinkage of theparts during POst-filling and cooling stage, which may be the reason of the differential distribution of theresidual thermal stress. Then the residual stress will lead to waIPa…
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STRESS ANALYSIS OF INJECTION MOLDED PARTS IN POST-FILLING STAGE |
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| Authors: | Jiang Tao |
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| Abstract: | The linear isothermo-viscoelastic constitutive equation is established according to the principle of viscoelastic mechanics. Given the boundary conditions of the temperature field, the linear thermo-viscoelastic constitutive equation is established acording to the analysis of the thermorheologically simple. The stress analysis model is constructed on the base of some reasonable hypotheses which consider the restraint conditions of mold and the characteristics of injection molding in the post-filling stage. The mathematical model is calculated by the finite difference method. The results can help to predict the warpage of plastic products. |
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| Keywords: | Injection molding Stress analysis Thermo-viscoelastic Laplace transform |
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