中文摘要 模具快速加熱技術在工業界的應用愈來愈廣,模具的加熱方式也推陳出新。本論文利用感應加熱技術對模具快速加熱做一研究探討,其技術內容主要是利用一通以高頻電流之感應線圈,對模具表面進行非接觸式之加熱。此技術不但可精確控制加熱溫度,且具快速加熱等優點,大幅縮短成型週期。 本文主要利用ANSYS分析軟體以3D實體模型來模擬線圈在模板上加熱的溫度情形,並配合實驗來做驗證。分析中使用暫態磁熱耦合(couple)方法分析,將電磁分析中所求得之焦耳損,作為熱傳分析的熱源,以求出加工物件在不同加熱時間的瞬間溫度;實驗中我們利用簡單的線圈設計(單匝矩形線圈、圓形線圈)對模具尺寸為22×17×1.5(公分)加熱,並使用熱影像儀量取加工物件在不同加熱時間的瞬間溫度分佈情形以探討感應加熱製程應用於模具表面快速加熱的可行性,及瞭解分析與實驗的差異。 在研究中發現,若要有好的加熱效果,線圈的設計、及線圈與加工物件間的距離有極大關係。用ANSYS軟體模擬在不同的加熱時間、不同的線圈與加工物件間之距離及給予不同的輸入電流時,感應線圈對模板的加熱情形,並以實驗驗證,由研究結果顯示實驗與分析都能得到相同的溫度趨勢。就矩形線圈在電流A(685安培),線圈與加工物件的距離為3mm而言,加熱時間與溫度關係的分析與實驗誤差,在5秒時為0.6℃(0.9%),在14秒時為11.6℃(12.4%);圓形線圈在5秒時為0.6℃(0.8%),在14秒時為5℃(5%)。 以本論文所得之結果,未來可利用ANSYS軟體做更複雜的線圈設計,並實際應用在射出成型上。
Abstract The objective of this paper was to investigate the rapid mold heating. We used CAE software-Ansys to simulation the coil that heating the mold plate as compared with experiment. In the experiment, we used the two kinds of coils that one is square and the other is circle to heating the mold plate that the dimensions are 22x17x1.5cm. In the simulation, the ansys software can make 3D model which used the same dimensions of coils and mold plate in the experiment and use transtion method to compute, so we can get the different time with different temperature at mold plate easily. As a result, we find the design of the coil and the coil distance of the mold plate are the important factor of the heating mold plate. In addition, the experiment and simulation have the similar results. For example the square coil that the current is 685A and the coil distance between the mold plate is 3mm, we get analysis and experiment result of the relationship between heating time and temperature is different 0.6℃when heating 5sec and different 11.6℃ when heating 14 sec. In the future, we can do complex coil design and use ansys software to analysis, so it will decrease development time and increase the injection molding efficient.