AL 1050圓杯引伸厚度均勻分佈最佳化參數研究

Parameters Optimization for Homogeneous Thickness Distribution in Circular Cup Drawing of AL 1050 Material

許佳龍(Chia-Lung Hsu)

指導教授 ： 蔡哲雄

國立臺北科技大學/機電學院/製造科技研究所/碩士(2011年)

摘要

一般圓杯引伸成品皆有厚度分佈不均勻的問題，本研究的主旨為經由有限元素法與田口法，找出使得成品厚度分佈最為均勻的最佳製程參數組，來達到圓杯引伸成品厚度分佈均勻化的目的。應用田口（Taguchi）實驗設計選擇四個影響產品品質較大的參數為控制因子，包括衝頭的肩角半徑（Rp）、沖模的肩角半徑(Rm)、摩擦係數(u)及胚料夾持壓力(B)。接著各因子選擇合適的三個水準以建立L9(34)實驗直交表。各控制因子與控制因子水準的決定是經由模擬測詴與實際加工考量所得。本文目標為求解使圓杯成品厚度分佈差異iT(品質特性)最小化的製程參數組合，本文應用有限元素分析套裝軟體進行分析L9(34)直交表中的9個實驗。經由9個實驗的訊號雜訊比(S/N ratios)分析結果，直交表中的第4個實驗恰為最佳製程參數組合，其成品厚度分佈相較於原始參數組，最厚與最薄的偏差量縮小了約26%，確實有明顯的改善厚度分佈均勻度。

關鍵字

有限元素法 ； 田口法 ； 厚度分佈均勻度 ； 深引伸

並列摘要

In general, the thickness of a circular cup produced by deep drawing process is non-uniform. The aim of this study is to search the optimized parameters for homogeneous thickness distribution of a circular cup in deep drawing based on Taguchi’s method and the finite element analysis. We select four important process parameters that influence the product quality very much as four control factors in Taguchi’s experiment design. These four parameters are the punch edge radius (Rp), die radius (Rm), coefficient of friction (u), and the pressure of the blank holder (B). Furthermore, by selecting three appropriate levels for each factor, we can construct the L9(34) matrix experiment. These control factors and levels were considered by evaluating the practical design of drawing process and initial results of finite element analysis. In this study, the objective of optimization is to minimize the thickness difference iT(quality characteristic) of a circular cup product. The finite element analysis package was used to analyze these 9 experiments of L9(34) orthogonal array. By analyzing the S/N ratios of the quality characteristics for these nine experiments, the optimum process parameters can be obtained. The results show that the optimum parameters of the circular cup drawing are just the same as 4-th experiment in L9(34) orthogonal array. Compare the quality characteristic by using the optimized parameters combination with the quality characteristic by using the initial parameters combination the uniformity of thickness distribution of the product was evidently improved.

並列關鍵字

Finite element analysis ； Taguchi’s method ； Thickness uniformity ； Deep drawing

參考文獻

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