|dc.description.abstract||In the experiment of this thesis, Moldex3D is used to verify the mold opening of the precision valve mold, and the Moldex3d analysis results are used to inject the filling time, holding time, injection pressure, holding pressure, and gate contribution, etc., to analyze and discuss the precision valve mold. In the injection process, will there be any mold problems that will affect the quality of the actual product, and the direction of parameter adjustment will be known in advance in the analysis results, and the short shot simulation results will be verified with the actual short shot results. The difference between the numerical simulation and the actual injection, after actual verification, it can be known that the design of the mold runner and gate can reach a balanced state, which means that the design and application of the mold runner and gate is feasible.
According to the characteristics of precision valve parts, the development of injection process will be discussed via product stability in the process, and product stability can be divided into dimensional accuracy stability and product weight stability. The stability of product weight will be discussed experimentally.
Through experiments, the injection molding parameter factors (screw speed, back pressure, mold temperature) are used to test the weight stability of injection molded products. The experimental verification shows that the faster the screw speed, the lighter the product weight will be. When the screw back pressure is set higher, the product weight will be heavier, but when the back pressure reaches a certain pressure, the product weight will start to become lighter. Finally, through the change of the mold temperature, from the mold dwell temperature of 40°C to 90°C, it can be seen that the weight of the product becomes heavier when the mold temperature is lower than 40°C, and the weight becomes lighter when the mold temperature rises to 90°C, so It can be seen that the higher the mold temperature, the greater the shrinkage of the product, which results in lighter weight.
Finally, the combination of Moldex3D mold flow analysis and actual experiments can shorten the follow-up product development time, reduce the number of mold repairs, reduce failure costs, and greatly improve product development benefits.||en_US|