| Summary: | 碩士 === 中原大學 === 機械工程研究所 === 102 === Injection molding is a way to achieve mass production in nowadays. It possesses numerous advantages such as minimized cycle time and multi-cavities products in one shoot; however, containing complicated process conditions makes trouble in production operators always. Some may think that CAE(Computer-Aided Engineering) can be a good solution to assist them in production process. For CAE simulation technology, it is definitely a molding-solver but could take a long time for a well-trained software technician. Many researches are focus on the way to build a rule for attaining molding parameters rapidly but for packing stage. The purpose for this study is to design a rule of packing standard as a reference for molding industrial.
The Study is using strip models to do the simulation and experiment. They are
designed as four different thicknesses, and for each one included four flow length
ratios. For every single model, there are two pressure sensors located on that, which are closed to the gate (0.1 of total length) and far away from the gate (0.8 of total length) and using material Chi Mei-CM211 (PMMA) with 40 oC mold temperature and three melted temperatures (240, 260, and 280 oC) for catching the flow data during filling stage. After finding out the minimizing pressure, it has been set as optimum filling time. Based on that, we design four packing pressures for each flow length and thickness and record the pressure datum. Those results are put together with simulation results for verifying the trend and accuracy. At the end of this study, a same methodology is conducted experiment in another injection machine for checking the feasibility.
By this methodology, we hope that it could create a standard rule for packing stage and assist molding industrial for getting better in product quality and yield rate.
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