Design And Research On Mould Of Thin-Wall Injection Molding Based On CAE

This paper aims at applying new CAD/CAE/CAM technology for mould to research on mould of thin-wall injection molding, and use finite element method to research the effects of pressure filed,velocity field and temperature field, in the process of injection, to product’s warpage and residual stress, being a guide to make innovation on mould structure. This paper adopts the mold CAD/CAE/CAM integration technology, could obviously reduce the cycle of from design to processing complete, and raise mould quality obviously, greatly improve the reliability of the products and production efficiency.Through the application of CAD technology to design modeling for plastic parts,the mould set in the database contains rich standard mould frame, can use directly, and design the shape of the cavity profile and the ejector system. Application of CAE technology for plastic parts structure stress analysis of the design, in the mould structure design of gating system, cooling system suitable location and optimize the process parameters, using CAM technology to realize the complex surface NC machining of mould manufacturing, complex curved surface machining, polishing, etc. The thin shell plastic melt filling flow mathematical model is established, According to the characteristics of the thin shell molding melt filling flow, depending on the flow behavior of polymer melt in the thin wall cavity for non-newtonian inelastic fluid under n on-isothermal condition of Mr Hele shaw flow, The introduction of reasonable assumptions and simplified, by the finite element/finite difference/control volume method as a numerical solution of the model, for shell molding filling process of stress field, temperature field and the moving boundary is solved, set a mathematic model of the injection molding3d flow analysis. A mathematical mold of melt filling flow of thin-wall injection molding is built in the paper, using MoldFlow as CAE platform to make mold flow analysis of the injection molding filling, packing and cooling processes of the plastic molding of the product’s battery compartment shell, optimizing the parameters of cooling system and gating system, obtaining the best gate location and optimizing the molding condition. Meanwhile, the intellectualized design of plastic molding is achieved with the application of UG/MOLD WIZARD module. Combining the intellectualized design with UG CAM HSM and synchronous engineering of assembly drawing, a injection mold of fan box shell of an educational computer.The study shows that all of them can relieve the plastic deformation to various degrees, that improving the temperature range of loop-cooling liquid, overall temperature variations of products, the balance of filling of gate location, whole cooling uniformity and screw speed.The design in the paper can be of some help for people to continually optimize parameters of mould design and injection craft, which will increase production efficiency and improve product quality well, especially shorten manufacturing period obviously when developing new products.