| Summary: | 碩士 === 國立臺北科技大學 === 管理學院EMBA華南專班 === 107 === The main purpose of this thesis is to reduce the defect rate of silver streaks after an injection molding process. The proposed approach is to optimize the injection molding parameters in an attempt to reduce the defects of silver streaks and to provide the molding parameters that can produce high efficiency and high yield. In this thesis, Taguchi quality method is used to study the molding parameters to reduce the defects of silver streak under the stability of the molding processing step. In the experimental procedure, the fishbone diagram is first opted to examine all the potential effects that have influence on the defect. All the potential factors are investigated and ranked, and the Taguchi method is used to determine the best-practice injection molding parameters. Before the Taguchi method is employed, the candidate quality characteristics must be selected. There can be found many factors affecting the quality during the product development stage, e.g., Gate size, runner size, injection pressure, fill time, melt temperature, mold temperature, etc.
This study is to reduce the silver streak serving as the quality characteristics investigated in Taguchi experiment, so this problem belongs to the smaller-the-better case. In the injection molding process, there are many factors affecting the surface roughness and scratches. Under the parameters obtained through the analysis and verification of the experiment in injection molding, the defect rate of silver grain defects is reduced by 0.2%, and the annual loss due to silver grain defects is reduced by 30%.
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