聚縮醛(POM)機械性質之射出成型條件最佳化研究

Optimizing Injection Molding Conditions in Mechanical Properties of Polyoxymethylene

詹凱元(Kai-yuan Zhan)

指導教授 ： 黃俊仁 ； 鄭銘章

國立中央大學/工學院/機械工程學系/碩士(2007年)

摘要

本研究以聚縮醛(Polyoxymethylene，POM)工程塑膠材料為對象，探討項目包括準靜態拉伸性質、磨耗性質及衝擊性質等三項。首先，以傳統實驗設計來進行實驗規劃，探討充填時間、熔膠溫度、模具溫度與保壓壓力等四個製程條件對於機械性質之影響。其次，利用田口實驗設計及變異數分析進行製程最佳化分析，以達到可快速求得所需要的品質目標。最後，利用田口方法結合主成份分析來進行多重品質特性考量下之最佳化製程條件預測。主要研究結果說明如下：
傳統實驗設計之分析結果:在準靜態拉伸性質具最大抗拉強度之最佳成型條件為充填時間1.5 s、熔膠溫度為200℃、模具溫度90℃及保壓壓力75 MPa。在磨耗性質具最小摩擦係數之P-direction最佳成型條件為充填時間0.5 s、熔膠溫度200℃、模具溫度90℃及保壓壓力55 MPa，而AP-direction最佳成型條件為充填時間1.5 s、熔膠溫度200℃、模具溫度90℃及保壓壓力55 MPa。在衝擊性質具最大吸收能量之成型條件為充填時間1.5 s、熔膠溫度215℃、模具溫度為75℃及保壓壓力75 MPa。
田口實驗設計之分析結果：在單一品質特性的考量下，準靜態拉伸性質的最大抗拉強度之最佳成型條件為充填時間1 s、熔膠溫度200℃、模具溫度90℃及保壓壓力75 MPa；而對其影響最為顯著的製程條件為熔膠溫度(貢獻度達40.8%)。而在同時考量到抗拉強度、摩擦係數及衝擊吸收能量等多重品質特性下，其最佳化製程條件為充填時間1.5 s、熔膠溫度200℃、模具溫度60℃及保壓壓力65 MPa；而對其影響最為顯著的製程條件為熔膠溫度(貢獻度達63.1%)。

關鍵字

機械性質 ； 製程最佳化 ； 射出成型 ； 工程塑膠 ； 聚縮醛

並列摘要

This study investigates the influence of injection molding process parameters on the tensile properties, wear properties and impact toughness of Polyoxymethylene (POM). Four manufacturing parameters including filling time, melting temperature, mold temperature and packing pressure were considered. The author used the traditional experimental design to understand the general tendency of each injecting parameter. Then, the author combined the Taguchi experimental design, analysis of variance (ANOVA) and principal component analysis (PCA) to optimize the manufacturing parameters.
The results of traditional experiment design showed that the best manufacturing parameters were filling time 1.5 s, melting temperature 200℃, mold temperature 90℃ and packing pressure 75 MPa for tensile strength. The best manufacturing parameters were filling time 1.5 s, melting temperature 215℃, mold temperature 75℃ and packing pressure 75 MPa for impact toughness. For the wear properttis, the best manufacturing parameters were filling time 0.5 s, melting temperature 200℃, mold temperature 90℃ and packing pressure 55 MPa in P–direction specimen, while they were filling time 1.5 s, melting temperature 200℃, mold temperature 90℃ and packing pressure 55 MPa in AP–direction specimen.
The results of Taguchi experiment design and ANOVA showed the optimum combination of manufacturing parameters was filling time 1.0 s, melting temperature 200℃, mold temperature 90℃ and packing pressure 75 MPa for tensile properties. Melting temperature was the most significant manufacturing parameter among them. When we consider the tensile strength, friction coefficient and impact absorb energy, the analytical results of Taguchi experiment design and PCA showed that the optimum combination of manufacturing parameters was filling time 1.5 s, melting temperature 200℃,mold temperature 60℃ and packing pressure 65 MPa. Also, melting temperature was the most significant manufacturing parameter.

並列關鍵字

POM ； Mechanical Property ； Manufacturing Optimum ； Injection Molding ； Engineering Plastic

參考文獻

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