Predicting shrinkage of injection molded products with viscoelastic characteristic
AssigneeCoretech System Co., Ltd.
InventorsRong Yeu Chang, Chia Hsiang Hsu, Hsien Sen Chiu, Shih Po Sun, Chen Chieh Wang, Huan Chang Tseng
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Abstract
A computer-implemented method and non-transitory computer medium for calculating a shrinkage of a molding product comprises a step of using a computer processor to calculate a molding pressure of a molding fluid in a molding cavity by taking into consideration an increase of a shear viscosity of the molding fluid by a decrease of a shear rate, and a step of calculating the shrinkage of the molding products by taking into consideration a variation of a specific volume of the molding fluid as the molding pressure and a molding temperature decrease.
Claims14
A computer-implemented method for calculating a shrinkage of a molding product, comprising a step of using a computer processor to calculate the shrinkage of the molding product from a molding fluid by taking into consideration an increase of a shear viscosity of the molding fluid by a decrease of a shear rate;
- wherein the increase of the shear viscosity of the molding fluid by the decrease of the shear rate is represented using an expression:
- ηVE(P,{dot over (γ)})=exp(b({dot over (γ)})P)
- where ηVE represents the increase of the shear viscosity, {dot over (γ)} is represents the shear rate, P represents a molding pressure, and b({dot over (γ)}) represents the shear rate;
- wherein the shear rate is represented using an expression:
- b({dot over (γ)})=Σn=1N Cn exp(−{dot over (γ)}/tn)
- where Cn and tn are constants.
A non-transitory computer medium containing computer instructions stored therein for causing a computer processor to perform operations for calculating a shrinkage of a molding product, the operations comprising a step of calculating the shrinkage of the molding product from a molding fluid by taking into consideration an increase of a shear viscosity of the molding fluid by a decrease of a shear rate;
- wherein the increase of the shear viscosity of the molding fluid by the decrease of the shear rate is represented using an expression:
- ηVE(P,{dot over (γ)})=exp(b({dot over (γ)})P)
- where ηVE represents the increase of the shear viscosity, {dot over (γ)} is represents the shear rate, P represents a molding pressure, and b({dot over (γ)}) represents the shear rate;
- wherein the shear rate is represented using an expression:
- b({dot over (γ)})=Σn=1N Cn exp(−{dot over (γ)}/tn)
- where Cn and tn are constants.
Dependencies are inferred from the claim text.