承受扭轉負荷鈑金構件之最佳化設計

Analysis and Optimum Design of Sheet Metal Parts Subjected to Pure Torsional Loading

本研究之目的是探討直接從鈑金件沖壓彎曲成形而凸出之小鈑金構件，在承受扭轉負荷時，產生最小變形之最佳化設計與分析。研究方法是結合有限元素分析軟體之非線性靜力分析能力與田口法之實驗設計程序，尋求最佳化設計方案。首先應用商用分析軟體分析依經驗法則設計之鈑金構件在承受固定扭矩時之變形量，並經實驗驗證此分析模型之正確性。而後再依田口法實驗設計程序找出所選定設計因子中的最佳參數組合，使受扭力後的結構，變形量可以達到最小。本研究已成功的找出符合設計要求的最佳參數組合，且從此個案之分析結果可知，影響此結構最大設計因子為鈑金厚度，其次為寬度、長度、補強種類等。因此，改變鈑金件厚度、寬度對結構抗扭能力有最好的效率。

The main aim of this study is to investigate the optimum design solution for a small sheet metal part which is directly formed from sheet metal under pure torsion. In this study, a finite element technique is used to perform the nonlinear and large deformation analysis of the component designed under constant torque due to the features of the problem, and a simple torsion test is also conducted to verify the accuracy of the finite element model. Then experimental design using the Taguchi method is followed to analyze the effects of design factors on the deformation of sheet metal parts. The target of the analysis is the minimum deformation of the component under a given torque. The design factors considered include the thickness, width, and height of the sheet metal, the position of the hole, the radius of the bend, and the types of ribs, etc. An optimum solution minimizing deformation under the design criteria is generated in this case study. The final results also show that the thickness, and the width of the component considered have large effects on the torque resistance capability.