超高速薄殼射出成型之製程特性與成型參數對機械性質影響之研究

Study on the Process Characteristics of Ultra High Speed Injection Molding and Effects of Molding Parameters on the Mechanical Properties of Molded Parts

曾賢壎(Hsien-Hsun Tseng)

指導教授 ： 黃健生 ； 陳夏宗

中原大學/工學院/機械工程研究所/博士(2009年)

https://doi.org/10.6840/cycu200900020

摘要

中文摘要
當塑膠成型品的發展走向輕、薄、短、小的設計理念，產品的設計強調可攜性與輕便性，使得產品的機械強度益顯重要。當成型品厚度愈來愈薄，塑料與模壁接觸固化的時間就會減少，因此在塑料進入模穴中尚未固化前，射出速度是非常重要的一個因子。基於此，超高速射出成型為必然之要素。
本研究主要在於探討射出製程參數對於薄殼成型品之機械強度的影響，塑料ABS在雙澆口厚度0.6 mm之實驗中，射出速度由900 mm/s昇至1200 mm/s的影響最大。塑料HDPE在單澆口厚度0.6 mm之實驗中，料溫的影響效應最大。塑料HDPE在雙澆口厚度0.6 mm之實驗中，模溫的影響效應最大。
本研究利用超高速射出成型機成型得到ABS與HDPE二種塑料，在料溫保持固定(240℃)，射壓最高/off之製程條件下，改變模溫(30℃〜100℃)、射出速度，得到厚度為0.25 mm (32×24×0.25 mm)之安全數位(SD)卡之模溫-射出速度的製程成型視窗。

關鍵字

超高速射出成型 ； 機械強度

並列摘要

Abstract
Going along with the high technology development, many of the plastic products are designed toward weight-reduction, thin wall and minified size, so it is more important for mechanical strength of these products. The thinner the thickness of part, the shorter solidified time of plastic resin. Therefore, injection velocity plays a significant role in influencing part quality including mechanical strength. Based on these, ultra speed injection molding is necessary.
This study investigates the effect of processing conditions on the mechanical strength of thin-wall parts. From the experimental results of part thickness 0.6 mm, it was found that injection velocity (from 900 mm/sec increased to 1200 mm/sec) that affect mechanical strength most significantly for ABS resin at double gate. Furthermore, melt temperature and mold temperature are two parameters that affect mechanical strength most significantly for HDPE resin at single gate and double gate, respectively.
In this study, the molding window (defined as the mold temperature versus the injection velocity) of Secure Digital Card (with the dimension of 32×24×0.25 mm) was get using ABS and HDPE resin under the molding conditions of melt temperature 240˚C, the higher injection pressure/off, mold temperature (30˚C~100˚C) and various injection velocity.

並列關鍵字

ultra speed injection molding ； mechanical strength

參考文獻

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