The warpage simulation with in-mold constraint effect in injection molding

This paper develops a new numerical approach to simulating the mold constraint phenomenon of warpage at the in-mold stage in injection-molded part of complex geometry and improves the accuracy of warpage analysis. Warpagein injection molding is the result of unequal volumetric shrinkage of material throughout the geometry of the piece as it cools from a melt to a solid state. Before the part is ejected, the deformation of warpage has been developed inside the mold. The influence of in-mold constraint for warpage is different according to the time of in-mold period. This in-mold constraint effect of warpage analysis technique is proved to improve the accuracy of warpage analysis for 3D/2.5D model. Several industrial cases with complex geometry are also studied to illustrate the capability of the proposed methodology.