| Summary: | 碩士 === 國立高雄應用科技大學 === 模具工程系碩士班 === 94 === This thesis presents the test of the existing plastic bottom shell of PMB 7530 of Sunon Electric Machine during shaping and selecting the plastic material. Without changing the original structure of the existing injection mold, but with considering for reducing the warping of the plastic bottom shell, a series of the related analysis is conducted to find out the main reason to produce warping.
The experiment contains injection shaping and CAE analysis. We draw the control factor to arrange simulation conditions and then carry on the injection experiment by adopting the simulated result of CAE as test parameters. First, we study the effect of different working parameters on warping. Second, we investigate the effect of different orientation and adding glass fiber on warpage. Third, we consider the influence of adding cooling system on warping. Finally, we obtain the most significant control factor among the above three results to investigate the effect of different kinds of plastic material on warping.
By comparing the sample test result with simulation value of CAE in term of analysis of AOV, the main factor in influencing warping is the nature properties variance of PBT plastics. Thus, we may guess that the changing orientation of glass fiber, like variance of different PBT plastics and adding more gates, will reduce the warpage of plastic bottom shell. The present numerical simulation and experiment data demonstrate that the case with 30% of the glass fiber added shows a more significant effect on warpage than the pure PBT. At the same time, the result also confirms that reducing or destroying the glass fiber orientation makes warpage reduce. Therefore, we can obtain better quality of shaping of bottom shell. Finally, the experiment result agrees with numerical simulation result via AOV analysis in finding out that the types of plastic material, and gate are dominated factors.
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