應用線圈幾何設計於感應式模面加熱溫度均勻性影響之研究

Influence of the Geometry of Coil Design on the Temperature Uniformity of Mold Surface Using Induction Heating Technology

李安生(Anton Winarko)

指導教授 ： 李安生

中原大學/工學院/機械工程研究所/碩士(2011年)

https://doi.org/10.6840/cycu201100058

摘要

中文摘要

感應加熱技術是廣泛應用的工業技術，特別在於射出成型中的動態模具溫度控制。採用本技術有許多的優點，可以在短的成型週期中，增進塑膠製品表面品質、提高具微結構產品之轉寫性等優點。但是在於其加熱均勻性仍是本技術尚須克服的主要問題，本研究運用ANSYS模擬不同線圈參數設計得到較佳設計，並且後續與實驗進行驗證比較，實驗量測部分採用7點接觸式溫度sensor作為溫度歷程的紀錄。
本研究首先以單層線圈做加熱參數上的探討，設計加熱時間1、3、5秒，接著進行實驗與模擬的驗證來得到最佳加熱時間與距離(3s、10mm)，根據最佳參數做後續線圈設計，包含對稱與非對稱環繞方式、線圈型式(圓管、方管)與線圈層數(單層、多層與複合層)，實驗與模擬的結果以加熱後5秒做為比較基準。
研究結果顯示，加熱參數對於模面溫度均勻性影響，以加熱時間3秒與線圈距離模面10mm為最佳參數，加熱結束瞬間之最大溫差為93.6°C、加熱後5秒之最大溫差為51.6°C。線圈型式對於加熱模面的溫度均勻性也有重要的影響，採用對稱線圈設計於加熱速度可以增進1.3°C/s、加熱後溫升0.7°C/s，並且可以縮短溫度的差異程度，對於整體的溫度均勻性提升2.6%。採用方型管線圈可以提升溫度均勻性並且增進加熱速度達6.1°C/s、加熱後溫升3.7°C/s；雖然均勻性優於圓型管線圈，而對於不規則模面形狀較難以被適用。在線圈層數的射季中多層線圈會有較佳之溫度均勻性，但仍難克服中間低溫的情況。

關鍵字

動態模溫控制 ； 感應加熱技術 ； 溫度均勻性 ； 感應線圈設計

並列摘要

Abstract

Induction heating system is the most popular technology because its feasibility and efficiency of dynamic mold surface temperature control. This technology can reduce the surface defect of plastic part and also can replicate micro-structure within shorten cycle time. The problem that usually occurs in the induction heating process is the difficulty in controlling the uniformity temperature during the heating process. This study analyzed about getting better uniformity in the mold surface with many parameter of coil design. ANSYS simulation would use to make some validation between experiment and simulation. The measurement system used seven sensors to detect the temperature value with a distance.
The research began with single layer coil design which is simulated by changing the heating time (1s, 3s, 5s). Furthermore, validation would be used between experiment and simulation using the best heating time and modifying coupling distance parameter (3, 10 mm).According to this result, development coil design would be investigated by modifying coil contour (symmetry, unsymmetry), coil cross sectional shape (circle, square) and Multi Layer (three layer, five layer, outside layer). In spite of heating simulation, ANSYS simulation was combined with 5s after heating.
The result showed that using heating time 3s with 10 mm coupling distance get better uniformity. Maximum difference temperature value while heating is 93.6°C and after heating is 51.6°C. Moreover, the development for the coil design also showed that the selection of coil design is very important to get balance temperature in mold surface.Using symmetry coil design can increase the heating speed about 1.3°C/s and after heating speed about 0.7°C/s. The temperature value in the 42 mm left side sensor position increase about 12.8% and in the right side increase about 2.8% so the difference value become small. The temperature value in the other sensor position will also increase with average 2.6%.Square cross sectional shape can get better uniformity because it can reduce the heating speed about 6.1°C/s and after heating speed about 3.7°C/s. Even if the uniformity is better than circle cross sectional shape, but for the mold with irregular shape, it is very difficult to be applied. Multi layer concept can increase the heating speed better than single layer coil but still can’t achieve the uniformity in the center area

並列關鍵字

Dynamic mold temperature control ； Induction heating technology ； Uniformity temperature ； and coil design.

參考文獻

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