熱澆道系統之熱嘴加熱器設計研究

Study of the Nozzle Heater Design in Hot Runner System

林承洋(Chen-Yang Lin)

指導教授 ： 陳夏宗

中原大學/工學院/機械工程研究所/博士(2015年)

https://doi.org/10.6840/cycu201500962

摘要

本篇研究是基於熱澆道系統封閉於模具內，並將熱阻絕於外的作業特性。熱流板與熱嘴作業是處於料溫與模溫到達穩態後所進行的射出行為，研究將著重熱澆道系統中熱嘴加熱器設計可控論述；以熱嘴管內流道溫度均一與澆口溫度可控為標的，操作熱嘴結構與溫控設計暨調控加熱器位置與加熱能力同時兼顧散熱/阻熱介面與水套，溫控熱嘴澆口溫度為依歸。
研究運用熱傳理論，將熱源/熱阻與對應溫度，以數理聯立解析方式找出最適加熱器規格，開創出加熱器設計更快速的評估模式。研究也利用CAE可視化特質來模擬溫度分佈，並佐證數理計算與實驗流道內溫度分佈數據差異比對，建立三者相依性與定量可靠性。
實驗案例研究顯示：模面溫度控制在150C，並藉由熱嘴前端隔熱墊阻熱與水套溫度為關鍵調節下，熱嘴流道出口溫度能被有效調控在220C左右，熱嘴流道內呈現溫差約為50C。此與數理計算與CAE比較，具有定性相依與九成以上定量的可靠度，足以快速評估熱嘴結構設計與加熱器熱源分配適當性，甚至推演出引發塑料過熱裂解黃化的真實原因所在。

就研究價值與貢獻，藉由數理模式設計讓熱嘴溫控系統開發成本趨近更合理也更具商業競爭力。再者對於客戶產品特殊客製熱嘴規格提供業者更快捷設計評估模式，最終實踐十倍速的開發效能與物美價廉的專業技術商品。

關鍵字

熱嘴 ； 加熱器 ； 熱流板 ； 熱澆道

並列摘要

In this study, a hot runner system with the close loop control is applied to study the heater design and the heating control ability to build a fast design method of nozzle heater.

The gate temperature and the temperature uniformity of nozzle are two key targets to evaluate the system performance. Also, the nozzle system is isolated from the environment and in a steady state to simplify the heat transfers behavior. The nozzle structure, the cooling bushing effect, the heater layout and position are the main parameters to analysis the nozzle temperature control.

Base on heat transfer theory, the simultaneous equations method is applied to understand the relation between heat source and heat resistant and calculate the nozzle heater specification and convergence a faster way to design the nozzle heater. Moreover, the CAE tool is used to verify the experiment result and calculation result to get a dependence and high reliability nozzle heater design method.

From the experiment results, the gate temperature can be controlled at 220℃ when mold temperature is 150℃. The temperature difference in a nozzle is 50℃ and similar to the CAE result. Also, the burning problem is verified by the nozzle heater design method that built in this study to evaluate the reliability of this method.

From this study, a heater design method is built and shown the temperature distributions are very similar to experiment results. The simultaneous equations method can be a very useful and efficient tool for nozzle temperature design and provides a great help to the industry.

並列關鍵字

Nozzle ； Heater ； Manifold ； Hot Runner ； Cooling Bushing

參考文獻

2. 王玉琳，“熱澆道時序閥澆口系統開發與製程特性之研究”，中原大學機械工程學系研究所碩士論文（2001）。

3. 楊庭杰，“快速時序閥澆口系統應用於薄殼射出成型之探討”，中原大學碩士論文（2002）。

43. 林承洋，“熱流板內加熱器溫度最佳化研究”，中原大學機械工程學系研究所碩士論文(2009)。

7. J. Blundy, D. Reitan, and J. Steele, “Advanced Valve Gate Technology for Use in Specialty Injection Molding”, 1998 Annual Technical Conference-ANTEC, 44, 631-635(1998).

9. Ronak Shah, “Sequential Valve Gating for Thin Wall Injection Molding Comparison Between Experimental Result And Filling Software”, 2000 Annual Technical Conference-ANTEC, 1022(2000).