Rheological Analysis Of Plastic Products Injection Molding

Injection molding is an important method of forming plastic products. It can produce complex shape, high precision products. However, injection molding is a complex physical process. During the injection molding process, the polymer melt is through a complex deformation and temperature changes, and these are directly related to the products ultimate performance.Flow analysis is injection molding of an important technical means. It has important significance to optimize the design, shortening the molding cycle and improve product quality. Plastic business card was chosen for study in this paper. According as actual production needs, it was selected PS351 for materials, and analyzed a two-cavity plastic cards plastic grid in virtue of Moldflow software. Then it chose several rheological viscosity models to calculate and comparison. Through analysis and comparison, the main achievements are as follows:(1) In the paper, every main part parameters of the plastic business card has been abtained through the design calculation. Then it has established the plastic business card injection mould three-dimensional model in UG/MoldWizard. It was designed a set of complete mold structure, including the core, the cavity, the mould frame, the inlay, the slide, the gating system and the cooling system structuralism design.(2) Using the Moldflow/MPI analysis software, the plastic business card injection mould has been carried on the grid mesh, and the analysis type and the order has been established. Polystyrene (PS) was chosen to take this analysis the material in this paper, and the best gate location has been determined. After the pre-treatment process, filling simulation has been finished in the paper, and the results of the packing time, the pressure, the temperature at flow front, the pressure curve at injection location and so on were analyzed.(3) Based on the material parameters of the different viscosity models at different temperatures of that the Power Law model, Ellis model and the model CIMP three viscosity model shear viscosity-shear rate curve, it has been analyzed that CIMP is better fit to Moldflow simulation. Factors of shear viscosity have been conducted in-depth discussions.