臺灣博碩士論文加值系統

本論文主要是針對兩種材料：奈米尼龍6與一般尼龍66改變射出參數，觀察射出成型的鋼珠保持器成品其外觀尺寸的變異，本文選用的射出參數為射出速度及保壓壓力，原因為該參數對結晶性的尼龍材料成型尺寸收縮影響最大，因此適當的射出及保壓壓力有助於減少產品的收縮現象，進而提高成品的品質。本研究首先藉以電腦輔助工程分析（CAE）找出最佳成型參數，再以實驗驗證實際最佳的成型條件針對射出速度及保壓壓力變異對收縮率的影響。研究結果顯示影響成型最主要的原因為保壓壓力值，奈米尼龍6在保壓壓力80bar最為穩定，而尼龍66在保壓壓力75bar最為穩定。在強度上的表現比較，奈米尼龍6大於尼龍66將近68%，另外在尺寸的穩定性其長寬比也是奈米尼龍6優於尼龍66。本研究可提供業界在選用尼龍塑膠材料與設定射出成型條件時做為參考。

In this study, two different materials Nano-Nylon6 and Nylon66 are chosen to investigate the influence of injection parameters on the dimensional performance of steel ball retainer. The injection speed and holding pressure and of injection parameters dominate the performance of crystal material mostly so that those are selected as the main factors in this study. The proper holding pressure and holding speed can reduce the shrinkage of the part and increase the molding quality. The CAE simulation is implemented firstly then an experiment is proceeded to validate the influence of injection speed and holding pressure. The results show that the dimensional stability is achieved at the holding pressure of 80 bar for Nano-Nylon6 as same as that of 75 bar for Nylon66. For the impact strength, Nano-Nylon6 is larger 68% than Nylon66. Additionally, the dimensional stability of Nano-Nylon6 is better than Nylon66.