CAE分析應用於血糖計外殼之翹曲研究

血糖計外殼產品常用的材質為丙烯腈-丁二烯-苯乙烯共聚物(ABS樹酯)，因外殼的厚度非常薄，加上製程內在之複雜性，透過射出成型之後容易產生翹曲變形。本論文針對血糖計外殼產品與製程開發機理，使用Moldex3D軟體進行CAE分析，並配合田口方法的實驗設計，深入探討血糖計外殼產品之模具設計與最佳製程參數組合，以獲得最小的翹曲量。首先以L8(27)直交表進行干擾實驗，其次在主實驗中，採用L18(21×37)直交表中的七個三水準做為控制因子。由干擾實驗的因子反應表與因子反應圖得知，塑料溫度與保壓時間為重要的干擾因子，將此二因子合併為複合干擾因子。進一步分析結果顯示，影響翹曲變形的重要因子分別為保壓時間、塑料溫度、與澆口直徑。最後再利用變異數分析(analysis of variations)進行S/N比與品質特性的實驗誤差統合，結果顯示在95%的信心水準之下，影響翹曲變形的重要因子與田口方法的分析結果是吻合的。藉由信賴區間(confidence intervals)的計算，來評估因子效應的誤差，結果也顯示預測值與實驗計算值是足夠接近的，亦即本實驗相當的精確。

關鍵字

翹曲變形；田口方法；干擾實驗；複合干擾因子；變異數分析

並列摘要

The cover product of glucose meter is made by Acrylonitrile-butadiene-styrene (ABS) commonly. Since the thickness is thin and processing is very complicated, the warpage defect is often to encounter. In this paper, to understand the warpage mechanism for the cover product of glucose meter, we have applied Moldex3D software to execute CAE analysis. And Taguchi method was used for the design of experiment. We tried to get the mould design and the optimal molding parameters to manufacture the smallest warpage product. Specifically, the L8 (27) orthogonal array was used to execute the interference experiment. Furthermore, the L18 (21×37) orthogonal array was used in main experiment with seven three-level control factors. According to the response table and the response graph, the melt temperature and packing time are the most important interference factors. Then the melt temperature and packing time were combined to a compound-interference factor. After further analysis, results show that packing time, melt temperature, cooling time and gate diameter are the most important factors that will affect the warpage of glucose meter significantly. Finally, analysis of variations was also used to pooling of errors, including S/N ratios and quality characteristics. When pick up under 95% confidence levels, the important factors of warpage coincide with the result of Taguchi methods. Moreover, we also applied confidence intervals to estimate the effects of the errors of factor. Results show that the predicted values and experimental values are in a very good agreement. Obviously, this experiment is verified with good accuracy.

並列關鍵字

warp deformation ； Taguchi method ； interference experiment ； compound- interference factor ； analysis of variations

參考文獻

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[10] 陳采玲，成型條件之交互作用對光碟機托盤翹曲的影響，台北:台北科技大學，2013。

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CAE分析應用於血糖計外殼之翹曲研究

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