造型塑件之曲面重建與模流分析研究

Surface Reconstruction and Mold Flow Analysis for a Shaped Plastic Part

張家源(J. Y. Chang) ； 張達元(D. Y. Chang)

《華岡工程學報》 23期 (2009/01) Pp. 105-112

https://doi.org/10.29987/CCUHKJE.200901.0013

摘要

逆向造型件的曲面重建工作，需要有精度很高的掃描儀配合專用的CAD軟體，才能完成模型的建構。為了克服非接觸量測精度不足、專業逆向CAD軟體費用高昂的問題，本研究發展利用三次元座標測定機與泛用3-D CAD軟體之逆向建模系統。以接觸式量測（TTP探頭）得到造型件的關鍵曲線，用以建立重建物件的主體特徵；並利用非接觸式的影像量測法，得到工程特徵尺寸；應用順向設計工法完成造型件的模型重建。最後，以FDM快速原型機輸出，進行模型驗證。Moldflow為發展成熟之分析軟體，本文根據所建3-D模型建立有限元素模型，以各模穴同時飽模為目標，討論澆口、豎流道、橫道、注入口等尺寸，得到最佳的流道設計。本案以遊戲搖桿外殼件為說明例。

關鍵字

逆向工程 ； 曲面重建 ； 座標測定 ； 模流分析

並列摘要

Surface reconstruction of a shaped part requires a high precision scanner and professional CAD software to build up the 3-D model. To overcome the shortcomings of precision in laser measurement and the high expense of the professional software, this paper develops a modeling methodology by means of an image coordinate measurement machine (CMM) and a general 3-D CAD. Contact measurement by a TTP probe is used to derive the point data of the characteristic curve for constructing the main surfaces of the model, and image measurement is used to obtain the details of the engineering features. Base on the geometric data derived, the 3-D model is built by forward design method. In addition, the CAD model is fabricated by rapid prototyping machine (FDM) for model examination. Moldflow is a proper validated software for plastic mold simulation. This study establishes a finite element model based on the 3-D model built to examine the effects of pouring gate, sprue, runner, and enterance dimensions of the mold cavity on flow filling problem. A joke stick is used to prove our study.

並列關鍵字

Reverse engineering RE ； Surface reconstruction ； Coordinate measurement machine CMM ； Moldflow analysis