射出成型最佳化之模擬與驗證

Optimization of Injection Molding Process Parameters By Simulations and Experiments

范俊明(Pham Tuan Minh)

指導教授 ： 謝傑任

共同指導教授 ： 林忠志(Chung-Chih Lin)

國立虎尾科技大學/工程學院/機械與機電工程研究所/碩士(2012年)

https://doi.org/10.6827/NFU.2012.00170

摘要

本論文研究射出成型參數之模擬與實驗。此模具用來生產兩個acrylonitrile butadiene styrene (ABS)的試片來測試耐衝擊性和拉伸強度，根據ASTM標準。模流分析找出最佳射出成型狀況的最小殘留應力和翹曲。在同時間，經由實驗得到最大的拉伸強度和耐衝擊強度。反應曲面法(Response Surface Method) 設計實驗表，進一步找出最佳的參數設定。在預測模型，融膠溫度、射出速度和保壓壓力是模型變數。所有參數對模擬都有重要的影響，其中融膠溫度和保壓壓力在實驗是最重要的參數。最佳設定參數中，最低殘留應力和翹曲與最高的拉伸強度和耐衝擊強度的射出速度和保壓壓力參數是相同的。

關鍵字

殘留應力 ； 翹曲 ； 拉伸強度 ； 耐衝擊強度 ； 反應曲面法

並列摘要

This thesis researches injection molding process parameters by both simulations and experiments. A mold is used to produce two specimens of acrylonitrile butadiene styrene (ABS) for testing impact resistance and tensile strength according to ASTM standard. Mold-Flow is implemented to determine the optimal injection molding conditions of the minimal residual stress and warpage through simulations. In the mean time, the maximum values of the tensile strength and the impact resistance are desired and validated by experiments. Response surface method (RSM) is selected to design the experiments and is further utilized to determine the optimal parameter setting. In the development of predictive models, melt temperature, injection speed and holding pressure were considered as model variables. All of factors are found to be significant in simulations. Melt temperature and holding pressure are the most important parameters in experiments. The optimal setting yields minimum values of residual stresses and warpages as the maximum values of the tensile strength and the impact resistance are reached at the same values of injection speed and holding pressure simultaneously.

並列關鍵字

Response surface methodology ； Central composite design ； Residual stress ； Warpage ； Tensile strength ； Impact resistance

參考文獻

[6] Michaeli, et al., Training in Injection Molding, Munich: Hanser Publisher, 2001, pp. 71.

[7] "Design of Experiments (DOE) Tutorial," [Online]. Available: http://www.moresteam.com/toolbox/t408.cfm .

[8] D. C. Montgomery, "Design and Analysis of Experiments," 7th ed., Wiley, 2009, pp. 14-19.

[9] C. P. Chen, et al. "Simulation and experimental study in determining injection molding process parameters for thin-sell plastic parts via design of experiments analysis," Elsevier - Journal of Expert Systems with Application, no. 36, pp. 10752-10759, 2009.

[10] Babur Ozcelik, Ibrahim Sonat "Warpage and structural analysis of thin shell plastic in the plastic injection molding," Elsevier – Journal of Materials and Design, no. 36, pp. 10752-1075, 2009.