| 摘要: | 摘 要
本論文主要以機構設計者角度出發，目前產業趨勢走向為成品形狀複雜，依靠人工經驗設計已經不能滿足需要，利用模流分析預先分析設計合理性，減少現場試模次數，有效降低成本和加快產品研發，縮短生產周期。
模流分析主要是看流體充填、冷卻、收縮、翹曲變形的狀況，模具開模前先預知成型趨勢以及變化情形，提前於電腦軟體做試模動作，如此一來不僅可以節省試模的時間，減少試模的成本，更可以大大縮短整個案子開發的時程等等好處。
本研究利用Moldflow軟體進行模流分析對塑膠材料的特性，做初步的分析，ABS+PC材料隨著溫度的變化，流動性較佳，結果ABS+PC材料與PC材料比較，PC材料變形值相對少，但填充難，故材料選擇ABS+PC。
澆口位置分析以塑料流動的方式及路徑，是塑料充填最重要的因素，應以平均充填為主，儘量以最短路徑為最佳首選，也要注意注射成型澆口位置可行性，本產品優化後的上蓋兩側變型對稱，模具調整較少，依此分析結果進行開模，實際開模品上蓋變形度符合模擬預期之結果。
關鍵字:設計、模流分析、電腦輔助分析、翹曲。
;ABSTRACT
This paper is the research of the expert system for mechanism design to introduction all process. It is more and more important in pre-simulation and analysis because the industry trends in the high accuracy and complex shape product. Depend on the design of operator‘s experience is not enough, need ensure design using by anticipation of mold flow analysis to reduce the times of injection molding, cost down effectivity, speed up the product development and shorten cycle time.
Mold flow analysis is mainly to see the fluid filling, cooling, shrinkage, warping deformation of the situation, that can anticipate the trends and change situation before the mold is made design, so that is equal of the mold testing on computer. The advantage is saving the time and cost of testing mold, and also shorting of schedule the mold project.
This research is using the software “Moldflow” in mold flow analysis, the visualization process of Computer-aided analysis (CAE), supply the crucial role on building the bridge between each department and also using the analysis result to evidence and avoid the bad design.
The characteristic of plastic materials, do initial analysis, “ABS+PC” material as the temperature changes is smaller viscosity changes and better fluidity by different temperature. Compare with ABS+PC and PC materials by simulation result, PC material is smaller deformation but it is difficult to padding so choosing the materials “ABS+PC”.
The analysis of gate location is using the flow method and path of plastic product that is most of important factor. So the padding balance and shorten path is best choice and the first priority is reducing the flow channel scraps. Notice to injection of preforming gate location feasibility. The optimization of the upper cover on both sides of the variant symmetry, mold adjustment less, according to the results of this model to open the mold, the actual shape of the top cover deformation in line with the expected results of the simulation.
Keywords: Design, Mold flow analysis, Computer-aided analysis, Warping. |
