2002-08-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/698853摘要：光電元件之精度要求日益遽升，射出件的品質所要求尺寸的精確性、分子定向、翹曲、及光學性質等日益嚴苛。加上許多表面微結構需精密複製，形成極大挑戰。 本研究為一個兩年性計畫。第一年主要為先應用3-D模流分析得出一般射出成型楔形模具所需澆口形式、大小及位置和水道的配置，以達最佳化模具設計。並以此製作模具來進行精密射出實驗，並與模流分析結果比較，探討應用一般射出成型楔形板件，就其模具設計、製程及品質作系統化的比較。 第二年主要為依照第一年傳統射出成型之結果，探討射出壓縮成型。射出壓縮成形結合射出及壓縮緻密化的機構，可改善收縮又減小內應力及分子定向，在表面微結構成型亦可獲得較高的拷貝度。但壓縮導光板的楔形板件，因為幾何厚度的不同，，易使厚薄端產生不同壓縮量而無法大幅提升複製效果。本研究提出一應用不等行程射出壓縮成型的構想，使得厚薄端後壓縮的比率一致，以增進品質。本研究比較傳統射出壓縮及不等行程射出壓縮效果，並與傳統射出比較。 <br> Abstract: With the progress in optoelectronic industry, the optical plastic parts demand high contour accuracy, low residual strain and low production cost. Many precision parts have micro features on surface. This presents an ever-increasing challenge. The molding of the light panel for LED modules is an typical case. The wedge-shaped PMMA plates have micro v-grooves on the surface. It demands flatness, uniform thickness and accurate replication of the features. In this two-year joint project, this sub-project is devoted to the experimental investigation on the precision molding of v-grooved wedge plates. In the first year, the 3-D finite-element simulation of the flow will first be performed for predicting melt fronts during filling by another sub-project. After the optimal design of the filling system is reached, the simulation of the temperature field and the prediction of warpage after cooling will be followed for optimal packing and cooling for precision. The mold design and manufacture will be carried out. During the mold trial-out, the short shots showing the progression of melt fronts will be collected and compared to the predictions. The specifications of the flatness and uniformity will be fulfilled after modifications. In the second year, the compression will be added to the injection molding process. The so-called injection compression molding (ICM) incorporates both packing- and compression-based densification mechanisms. The capacity for precision molding can be preatly enhanced. However, wedge plate is not uniform in thickness. Compression with uniform stroke will yield non-uniform degree of densification. In this study, compression with non-uniform stroke will also be implemented. The quality of the v-grooved wedge plates fabricated with conventional injection molding, ICM with uniform stroke and ICM with non-uniform stroke will be compared. The effectiveness of adding compression to the injection molding of micro-featured wedge plates will be evaluated and justified.楔形板射出成型射出壓縮成型不等行程射出壓縮成型微結構wedge platesinjection moldinginjection compression moldingmicrostructure