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研究生:徐偉珉
研究生(外文):Wei-Min Hsu
論文名稱:薄型鍵帽射出成型製品之殘留應力研究
論文名稱(外文):Study on Residual Stress of Thin-keycaps Injection Molding
指導教授:韓麗龍韓麗龍引用關係
指導教授(外文):Lee-Long Han
口試委員:韓麗龍張仁安林宗聖施議訓
口試日期:2018-07-01
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:製造科技研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2018
畢業學年度:106
語文別:中文
論文頁數:48
中文關鍵詞:光彈分析殘留應力牛角澆口薄型鍵帽
外文關鍵詞:photoelasticityresidual stressbanana gateThin-keycaps
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  • 下載下載:92
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在射出成形製程,澆口設計對於熔膠的充填行為影響甚鉅,進而影響塑膠製品的品質。本研究以筆記型電腦之薄型鍵帽作為研究載具,探討在射出成型後的殘留應力。實驗方法包含兩種不同澆口設計:單一牛角澆口(single banana gate)與一分為二之雙牛角澆口(dual banana gate);產品設計是建構兩種不同的減膠方式,模具設計為一模四穴。利用SIGMASOF軟體作CAE模擬分析,並配合實際射出成型實驗,比較四種不同的實驗設計對於塑件品質之影響。CAE模流分析結果顯示,一分為二的牛角澆口將有助於降低熱殘留應力產生,及能夠有效的降低塑件脫模而產生的頂出殘留應力。再以實際開模進行射出成形品作驗證,透過光彈分析可以發現雙牛角澆口設計之樣品於澆口周圍有較小的殘留應力。最後將實際射出的樣品進行冷熱衝擊試驗,比較澆口附近的變形量,結果發現雙牛角澆口設計較其他設計有著最小的變形量。將此澆口設計導入生產線的模具,可大幅提升薄型鍵帽生產品質。
The gate design has a great impact on the filling behavior of melt in an injection molding. It further affect the quality of the plastic product. In this study, the thin keycap of the notebook computer was used as the research subject to investigate the residual stress after injection molding. Experimental method including two types of gate design: single banana gate and divided into two branches of dual banana gate. Product design including two types of grooving design, and the mold design was a four-cavity design. Using SIGMASOF software and actual injection molding, experiment, compare the effects of four different experimental designs on the quality of plastic parts. The results of CAE analysis show that the dual banana gate will help reduce the generation of thermal residual stress and effectively reduce the residual stress caused under ejection process. Then develop the actual mold to verify the injection molding, the photoelasticity stress analysis indicates that the sample with double banana gate has the lowest residual stress around the gate. Finally, using thermal shock test for the injection molding samples to compare the amount of deformation near the gate. Results show that the minimum deformation is double banana gate design. The gate design introduced into production line can greatly increase the quality of thin-keycaps.
目 錄

摘要 i
ABSTRACT ii
誌謝 iii
目錄 iv
表目錄 v
圖目錄 vi
第一章 緒論 1
1.1 前言 1
1.2 研究動機 1
第二章 文獻探討 2
2.1 文獻回顧 2
2.2 殘留應力的分類 3
2.3 殘留應力對塑膠品的影響 5
2.4 殘留應力的改善方法 6
2.5 殘留應力偏光檢測 8
2.6 潛伏式澆口設計 10
第三章 實驗方法 13
3.1 建立塑件模型 15
3.2 SIGMASOFT模擬分析 19
3.3 射出成型實驗 26
3.4 產品檢驗 29
第四章 結果與討論 33
4.1 四種不同設計差異比對 33
4.2 模流分析探討 35
4.3 殘留應力光彈圖探討 40
4.4 產品冷熱衝擊測試探討 41
第五章 結果與討論 46
5.1 結論 46
5.2 未來展望 46
參考文獻 47
參考文獻

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