塑膠射出鎖模力量測方法分析

Measurement of Mold Clamping Force in Plastic Injection

林建鋒(Chien-Feng Lin)

指導教授 ： 陳恕行

崑山科技大學/工程學院/機械工程研究所/碩士(2007年)

摘要

在塑膠射出成型作業中，鎖模力不均勻會導致成品出現毛邊或塑料由模穴漏出，因為對於塑膠射出精密度要求越來越高，鎖模力監測也將愈顯重要，目前鎖模力監控系統仍不是很普及，主要原因是技術與成本價格問題，塑膠射出機有四支繫桿，模具組裝不良則容易產生鎖模力不均勻，也就是四支繫桿的拉力不一樣，鎖模力必須大於模穴壓力乘上模穴面積。
本研究論文主要研究開發兩種鎖模力之量測系統，第一種是應變規量測系統，應變規是傳統的變形量測工具，但在應用於鎖模力之量測時仍有細節問題需要解決，第二種是製作光槓桿量測系統，光槓桿可以直接觀測變形，而且光槓桿能重覆使用，光槓桿量測設計是我主要思考項目。

關鍵字

光槓桿量測 ； 鎖模力 ； 繫桿

並列摘要

In plastic injection, the uneven distribution of clamping force will result in deckle edge and plastic material leak from mold cavity. Because of progressively high quality requirement in plastic product, therefore, it is important to develop an in-situ clamping force monitor system for plastic injection. At the moment, the clamping force monitor system is not popular that the main reason is the skill and cost price. There are four tie bars in an injection machine, when the mold and die do not properly assemble in the injection machine that will lead to an uneven distribution of clamping force, i.e., the four tie bars have differing tensile stress. The clamping force should be larger than the mold pressure times mold cavity area.
Two kinds of clamping force monitor systems were researched and developed in the study. The first one is strain gauge system, which is a traditional method for measurement of strain, but some problems have need of resolution as it applies to the clamping force measurement. The second system is the optical level sensor for clamping force measurement that allows direct observation of strain and can be used repeatedly. Considered the strain of the optical level sensor measurement is the key factor in our design.

並列關鍵字

Optical lever measurement ； Tie bars ； Clamping force

參考文獻

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