| 研究生: |
宋昱廷 Sung, Yu-Ting |
|---|---|
| 論文名稱: |
應用非平面感應線圈於射出成型模具表面加熱之設計 Design of Non-Planar Induction Coils for Injection Molding Tool Surface Heating |
| 指導教授: |
黃聖杰
Hwang, Sheng-Jye |
| 共同指導教授: |
李輝煌
Lee, Huei-Huang |
| 學位類別: |
博士 Doctor |
| 系所名稱: |
工學院 - 機械工程學系 Department of Mechanical Engineering |
| 論文出版年: | 2014 |
| 畢業學年度: | 102 |
| 語文別: | 中文 |
| 論文頁數: | 86 |
| 中文關鍵詞: | 射出成型 、感應加熱 、模具溫度 、縫合線 、非平面線圈 |
| 外文關鍵詞: | Tool surface temperature, Electromagnetic induction heating, Temperature uniformity, non-planar coil, injection molding process, welding line |
| 相關次數: | 點閱:139 下載:6 |
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模具的溫度對於塑膠成型製程之中為一重要的控制參數,由於熔膠在射出的過程中,接觸到較低溫的模仁表面後形成的固化層,減少了熔膠在模穴內流動的空間,使得熔膠不易充填,尤其對於具有微小特徵的成型品,更需考慮成型後的轉寫率,目前在業界皆以高速射出及升高模溫來進行微特徵成型,在高射速的成型條件之下,可以爭取一點時間讓融膠在固化前能充填整個模穴,除此之外,較高的射出速度在經過澆口的過程中,因為高分子鏈的相互摩擦而有剪切稀薄的效應,使融膠的黏度降低,增加融膠的流動性,但在高射速的成型條件下,容易使產品產生殘留應力與翹曲,為了可以得到符合設計尺寸的特徵轉寫率,並減少在射出製程上產生的成品缺陷,高模溫成了首要探討的控制參數。模具溫度的控制,有利用液體、氣體加熱或以高溫火焰和鹵素燈照射使模具溫度上升,目前更有利用線圈以感應的方式來提高溫具溫度,由於感應加熱有升溫迅速且低能源消耗的優點,使得感應加熱成為目前模具溫度控制的主要趨勢。
本研究針對感應加熱的線圈設計,與操縱加熱的參數設定進行一系列的實驗與研究,並對於現有的產品模具進行感應加熱實驗,利用感應加熱使模具溫度上升,以提升射出產品的品質,本研究中以平面式柵欄線圈,線圈電流為反向電流,進行模仁加熱參數設定的探討,並針對七吋液晶顯示器的外框架與具曲面外觀的傳真機上蓋產品在射出成型製程中,應用感應加熱進行實驗,在七吋外框架的實驗中,首先對線圈的加熱參數進行實驗探討,對於電流的大小與導磁塊的配置進行加熱實驗,並將線圈配合外掛式機械手臂在射出製程中,對模具的模仁表面進行加熱實驗,在具曲面變化表面的傳真機上蓋實驗中,設計兩個不同的感應線圈,配合導磁塊來增加感應加熱後溫度分布的均勻度。
本研究結果顯示,在平面式的柵欄線圈實驗中,沒有接水電纜的線圈加熱均勻度為88.80%,每秒可升溫約2℃,接水電纜的線圈加熱雖然升溫速度慢但溫度均勻性可達95%左右;七吋外框架實驗中由於塑料添加了木粉,使得產品表面容易浮纖,應用感應加熱可以降低產品浮纖的現象並增加產品表面的光澤度,其線圈加熱的溫度均勻度可達90.90%,每秒最高升溫3.73℃;而傳真機上蓋的非平面室的感應線圈加熱實驗中,由於模仁有深度的高低變化,整體模穴冷卻的速度不一,容易使溫度容易累積於轉角處造成溫度分布不均,在非平面的線圈設計上必須考慮其熱量累積處,在非平面的線圈成型加熱實驗中,感應加熱的結果顯示能有效降低縫合線在產品表面產生的現象,非平面線圈加熱10秒後,可以使模具由50℃的初始溫度上升至120℃,溫度均勻度為79%~84%。另外在模擬結果中顯示,具有微結構的粗糙表面對於光滑表面有較高的平均溫度。
Recently, energy saving is one of the important issues for polymer processing industry. Electromagnetic induction heating has many advantages such as fast heating and low energy consumption. Previous studies using electromagnetic induction heating for rapid tool heating have indicated that the temperature uniformity on a cavity surface is not easy to be achieved. In this paper, a planar coil was used for heating uniform 30mm thick hot work tool steel (JIS SKD61) surface, another coil was used for 7 inch display frame tool and another non-planar coil was designed for a fax machine top case tool. The planar coil heating experiment results showed that temperature uniformity is about 88% and heating rate is 2℃ per sec. The 7 inch frame coil heating results showed that the temperature uniformity is about 90.90% and heating rate is 3.73℃ per sec. The non-planar coil heating result showed that the temperature of tool rose from 50℃ to 120℃ in 10 seconds.
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