A Study of Plastic Injection Molding Optimization Process Using Taguchi Method and PCA 吳勝煌、余豐榮
E-mail: 9607607@mail.dyu.edu.tw
ABSTRACT
In modern society, plastics injection molding technology has been widely used in variety of industrial products. Conventional plastic injection molding process has popular problem of ineffective control of quality; occurrence of this phenomenon is due to lack of systematic method to maintain stable quality, if it can be solved, then product quality could be raised to higher level, further
reinforcing its industry competency. This study focused on optimization of multiple dimensions in injection molding process, applied Taguchi method to conduct preliminary Taguchi test first; then combined with Principle Component Analysis, obtained optimum factor and level combination, and enhanced stability of product geometry. Thereafter, this study found that Principle Component Analysis could be effectively used in multiple-quality-feature problems to obtain integral solution, so as to compensate disadvantage of conventional Taguchi method; furthermore, holding pressure could be regarded as adjustment factor of target process, this parameter factor could regulate mean size of finished product so as to approximate to target value and increase geometry accuracy.
From analysis of variance result, it’s known that three parameters, material temperature, holding pressure and injection location, have significant impact on size of finished product.
Keywords : Plastic Injection Molding ; Taguchi Method ; Principle Component Analysis ; Adjustment Factor ; Analysis of Variance (ANOVA)
Table of Contents
授權頁... iii 中文摘要... iv ABSTRACT... v 誌 謝... vi 目 錄... vii 圖目錄... x 表目
錄... xii 第一章 緒論... 1 1.1 研究背景與動機... 1 1.2 研究目 的... 2 1.3 研究方法... 2 1.4 研究流程... 3 第二章 文獻探 討... 4 2.1 塑膠射出成型技術... 4 2.1.1 射出成型機... 4 2.1.2 射出成型技 術... 6 2.1.3 塑膠製品成型不良種類與原因... 10 2.1.4 塑膠射出成型技術相關改善對策... 13 2.2 田 口式品質工程相關文獻... 14 2.3 各種權重求算方法之比較... 18 第三章 田口式品質工程...
20 3.1 品質損失函數... 20 3.2 參數設計... 23 3.3 直交表... 25 3.4 資料 分析... 27 3.4.1 信號雜訊比... 27 3.4.2 回應表與回應圖... 29 3.4.3 變異數分 析... 32 3.5 驗證實驗... 34 3.6 主成份分析... 36 第四章 案例探
討... 38 4.1 問題描述... 38 4.2 實驗設計與分析... 40 4.2.1 因子選擇及水準 設定... 40 4.2.2 直交表... 41 4.2.3 回應表與回應圖... 44 4.3 主成份分
析... 49 4.4 L9實驗之施行... 59 4.4.1 L27驗證實驗... 62 4.4.2 L9實驗變異數 分析... 63 4.5 調整因子之選取... 65 4.6 驗證調整因子之有效性實驗... 66 第五章 結論與 建議... 76 參考文獻... 77 附錄 1 L27實驗因子配置表... 80
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