同模異穴運用模流分析改善模具提升塑膠射出產能

Tunghai University Institutional Repository > 創意設計暨藝術學院 > 工業設計學系所 > 碩士論文 > Item 310901/31503

Please use this identifier to cite or link to this item: http://140.128.103.80:8080/handle/310901/31503

Title:	同模異穴運用模流分析改善模具提升塑膠射出產能
Other Titles:	A Mold-Flow Analysis of Using Family Mold to Improve Product Forming by Injection Molding
Authors:	吳芷諭 WU, CHIH-YU
Contributors:	羅際鋐 LO, CHI-HUNG 工業設計學系碩士在職專班
Keywords:	模流分析;田口實驗方法;同模異穴;家族模穴 mold flow analysis;Taguchi method;multi-cavity mold;family mold
Date:	2019
Issue Date:	2019-12-16T02:04:01Z (UTC)
Abstract:	於全球國際間快速多元化產業的競爭中，如何能滿足市場的需求，提昇目前產業的競爭力及生產效率，如何能在塑膠模具開發上降低成本及加強塑膠射出優勢是重要因素等。從大幅降低成本壓力至縮短開發時程皆是目前產業首要考量。此次分析針對產品模組化的其中一組同模異穴手機架零件進行分析。手機架零件是由上下各一個大夾子一個小零件及二個配件，所組合而成。本研究因傳統製造業大部份由傳統模具製造廠進行製作模具，而模具師傅依多年經驗傳承製作模具，設計模具的模穴空間配置、流道大小及澆口等，研究運用模流分析及田口實驗探討，分析傳統模具因前端模具設計不良，造成表面縮水及冷卻時間拉長，進行後端分析改善模具，找到最佳射出條件及產品品質，提昇產業競爭性。研究結果顯示，S/N比的重要因子模具溫度、射出速度、不同流道設計，運用配合Moldex 3D模流分析，找到最佳射出條件，並獲得目前塑膠射出產生的縮水凹陷造成冷卻時間拉長問題。藉由分析結果得知增加冷卻水路或改變產品肉厚部位，改善冷卻所拉長的時間，降低模具於射出時間行程，提昇產能，增加產品的競爭性。 With the global competition between fast-changing and diversified industries, the key to success is to satisfy market demands and to enhance the current competitiveness and product efficiency of industries. The critical factors include reducing the cost of development of plastic molding and strengthening the advantage of plastic injection. Each industry’s primary considerations include the great reduction of the pressure due to cost and the reduction of development time.In this study, the family mold of a cell phone holder that is designed by product modularization is analyzed. The cell phone holder is formed by top and bottom clamps, a small part, and two accessories. Since plastic injection molds are conventionally designed by molding houses in the traditional industry, tool makers fabricate tooling and determine the designs of cavity layout, runner size, and gates based on years of experience of their own. In this study, the approaches of mold flow analysis and Taguchi method are implemented to analyze the defective designs of front-end tools in conventional molding. After that, the molding can be improved by back end analysis in order to determine the optimal injection conditions and enhance the competitiveness of the industry. The results of this study indicated that, the critical factors that affect the S/N ratio include mold temperature, injection speed, and different runner designs. The Moldex 3D simulation software was used to analyze the mold flow of real injection molds in order to determine the optimal injection conditions and the optimal runner size. This approach can improve the problem of shrinkage and recess of injected parts due to longer cooling time and the flow imbalance of family molds with multiple cavities. The results indicated that the production capacity can be increased and the product competitiveness can be enhanced by adding more cooling passages, changing the thickness of the part, improving the longer time for cooling, and reducing the injection time and displacement of the injection mold.
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