Morgan & Finnegan LLP
Injection molding apparatus for predicting deformation amount in injection-molded article
 A simulation system predicts a behavior of a molten resin in a mold in filling, packing, and cooling processes by using a fundamental equation formulated by the finite element method, and shrinkage factors in a direction of thickness and planar directions based on anisotropy of a volume shrinkage factor obtained during prediction of the filling, packing, and cooling processes, so that a warp deformation in an injection-molded article can be predicted at a higher precision. In this simulation system, the warp deformation is predicted by calculating the shrinkage factors in accordance with: EQU .epsilon.Z=A+B.multidot.eV (1) EQU .epsilon.P=(eV-.epsilon.Z)/2 (2) wherein .epsilon.Z is a shrinkage factor in the direction of thickness, .epsilon.P is a shrinkage factor in the planar directions, eV is a volume shrinkage factor, and A and B are shrinkage coefficients. 
Cannon Kabushiki Kaisha
B B B
B29C B29C B29C
inventional additional inventional
Hisakazu Hiroaki Maki
Morinaga Yamagata Saito