熱澆道時序閥澆口系統開發與製程特性之研究

Development of Sequential Valve Gate in Hot Runner System and Investigation on the Associated Process Characteristics

王玉琳(Yu-Lin Wang)

指導教授 ： 陳夏宗

中原大學/工學院/機械工程研究所/碩士(2001年)

https://doi.org/10.6840/cycu200100349

摘要

熱澆道含時序針閥澆口開啟係重要的新成型技術，可以使得成型以類似接力賽之方式完成，對於降低成型壓力、減少產品殘留應力與消除縫合線有顯著的功效。然而由於熱澆道含時序針閥澆口開啟系統市價昂貴而且在控制上常呈現不穩定並缺乏精度，對於精密產品的開發影響頗大。
本論文之研究目的在於自行設計建立熱澆道含時序針閥澆口開閉控制系統，而所設計的模具為一厚度2.0mm平板型之熱澆道含閥澆口實驗模具。在模具的開發過程中，我們發現例如加熱器的選擇、熱電耦位置的擺放、如何分減少分散模具熱傳導的影響、模具加工的精度及水路的設計都是熱澆道模具成功與否的關鍵。而在針閥的動作上我們以高壓氮氣來推動並結合PLC 可程式控制器，以期能達到精準的控制。
在實驗部分我們利用自行設計的模具及控制系統探討無熔膠及有熔膠影響針閥開啟的反應時間。在無熔膠方面我們用四組不同的活塞直徑配合不同氣體壓力，利用CCD拍攝來判斷針閥反應時間。我們發現在活塞直徑19.70mm，氣體壓力為75bar時有最好的反應時間。而有熔膠方面，我們利用針閥全開及有針閥動作時熔膠流到壓力感測器的延遲時間差值即定義為針閥反應時間。從實驗數據中發現，當氣體壓力變大時針閥的反應時間將減少。

關鍵字

時序閥澆口 ； 閥澆口 ； 熱澆道

並列摘要

The hot runner with sequential valve-gate control can provide open/close capability at different time interval so that molding can proceed like relay race resulting in pressure reduction, residual stress minimization and weld-line deleting. However, the commercial valve gate systems exhibit unstable and inaccurate valve gate opening lending to the hesitation in industrial applications.
In this research a plate mold of 2mm thick with hot runner with sequential valve-gate control system was used to mold. In the process of mold design, we found the several key of the hot runner mold includes the heater choice, the location of thermal couple, reduce heat conduction effect, accurate of mold processes and design of cooling channel. The action of valve-gate control system will include human-machine interface capable of regulating with nitrogen pressure resulting in accurate response.
In the experimental we measured response time with no melt and melt in the mold. In the no melt experimental, we used four different piston diameters with various nitrogen pressure and the CCD camera will be used to monitor vale needle operation speed. In the other experimental, we added pressure sensor in the mold and the difference response time of the melt front across the pressure sensor between the open valve needle (without valve needle action) and valve needle action will be defined valve needle operation speed when the melt in the mold. Base on the experimental result, when the no melt in the mold, we found that the piston diameter 19.970mm with the nitrogen pressure 75Bar has the best response time. We also found that the response time will be reduced with the nitrogen pressure rise at the melt in the mold.

並列關鍵字

sequential valve gate ； valve gate ； hot runner

參考文獻

27. C-mold user’s guide, AC Technology, Ithaca, N.Y. (1999).

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

34. Feick, M., “Hot Runner Systems for Automotive Application,” Annual Technical Conference-ANTEC Vol.33, pp.1153-1157(1987).

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