記憶卡射出成型模內沖切力學之有限元素分析

Finite Element Analysis of In-mold Cutting Mechanics in Memory Card during Injection Process

徐銘燦(Ming-Tsan Hsu)

指導教授 ： 陳政順

國立臺北科技大學/機電學院/製造科技研究所/碩士(2014年)

摘要

本研究是利用有限元素分析軟體搭配快速去除料頭的模具結構，探討切刀與高分子材料沖切剪斷的力學變化，在個案中作法是將切刀分成九種角度，在不考慮溫度與摩擦力情況下模擬沖切剪斷側面澆口，模擬結果顯示等效應力會因為切刀角度不同伴隨著截面積變化而有所改變，另外透過模擬分析得到去除料頭所需的剪切力與文獻推論所計算出的數據相互驗證，誤差甚小；澆口寬度增加對於剪切力是有影響的
，雖然有助於射出成型但是需要更大的剪切力才能沖切剪斷，對於塑膠模具結構設計初期是重要的參考依據。
最後透過田口式品質設計方法得知，在沖切剪斷時澆口寬度對於切刀所承受的等效應力影響最大，切刀材料與切刀角度影響次之，澆口長度對於切刀所承受的等效應力的影響甚微；在模具設計初期，即有量化數據資料，供設計人員研發模具機構之參考，省卻大量實做實驗的時間與金錢成本，也避免了過度設計，所造成的成本增加，進一步對於自動化生產製造更是有效率的提升產能，將此模擬分析原則納入設計規範之中，更是有助於結構設計的可靠度提升。

關鍵字

有限元數分析 ； 模內沖切 ； 塑膠模具 ； 側面澆口

並列摘要

This investigation use of ANSYS software which based on tooling mechanic has rapidly remove runner device. For the experiment projects, author will analysis nine different angles gate cutting knifes. In the stimulate status that without consideration of temperature and friction, the author cutting the plastic part side gate for this experiment. The result shows von Mises stress will change by different angles cutting knifes and cross sectional areas. Through stimulate analysis, the result shows the shear force of gate cutting which match to corollary reference computed result. Increase wideness of gate that will affect shear force. However, it is good for plastic molding.
By Taguchi method for quality design, wideness of gates this factor have obvious influence to die-cutting von Mises stress. However, the material of cutting knife and cutting knife angle have less influence to die-cut von Mises stress. Length of gates almost no influence to die-cut von Mises stress. In the early mechanical design period, this study can provide quantity data to engineers for tooling design reference. It not only can save lots of time and money waste, but also can reduce the cost and prevent over design.Moreover, it can help for automatically mass produce and effectual improve capacity. This study can increase reliability of mechanical design, if this stimulate
analysis principle can bring into tooling design guild line.

並列關鍵字

Finite Element Analysis ； Remove runner device ； Plastic mold ； Side gate

參考文獻

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[1]Hidetsune Hojo, Hirosuke Masumori, Yodo Kageyama and Toshisada

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