雙層複合板材壓縮成形之有限元素模擬最佳化

本研究使用田口方法來探討雙層複合板材壓縮成形，以田口法L9（3^4）直交表進行實驗規劃，包含有4種不同的實驗參數，複合板厚比、剪降伏應力比、摩擦因子比以及板寬板厚比之實驗參數，加以探討雙層複合板材壓縮特性之影響，並求得雙層複合板材自由端表面均勻變形之最佳化的實驗參數。對於雙層複合板材壓縮成形最佳化，本研究以SUPERFORM商用軟體進行有限元素模擬，模具與複合板材之間的摩擦假設為定剪摩擦，上下模具之摩擦可不同。複合板材成形後外表面形狀，等效應力、等效應變、速度場、壓力分佈及壓縮負荷可由有限元素模擬。為了驗證有限元素模擬結果，可與切片分析模式[14]相互比較。比較兩種之壓縮負荷以驗證有限元素模擬之可行性。有效的調整各種壓縮條件以控制複合板材表面之均勻變形以易於複合板材之二次加工。所得結果可提供鍛造工業之參考。

關鍵字

有限元素法；切片法；雙層複合板材；田口法；最佳化

並列摘要

This study utilizes Taguchi method to explore the compression forming of double-layer clad sheet, and the experimental plan of L9(3^4) orthogonal table is conducted by way of four experimental parameters such as the clad thickness ratio, the shear yield stress ratio, the frictional factor ratio, and width thickness ratio to investigate the effect of double-layer clad sheet compression forming. The optimal experimental parameters to affect the uniform free surface of double-layer can be obtained. For the optimization of double-layer clad sheet forming, in this study the FEM simulation is carried out by the SUPERFORM commercial software, the frictions between the dies and the clad sheet are assumed as constant shear friction, and the frictions of upper-and-lower dies can be different. The outer surface shape of deformed clad sheet, the equivalent stress, the equivalent strain, the velocity field, the pressure distribution and the compression force are simulated by the FEM. With a view to verifying the simulated results of FEM, the compression force obtained from the slab analysis model[14] is used to compare with the FEM in order to check the acceptance of the FEM simulation. Adjusting various compression conditions effectively to control the uniform deformation of outer surface is easy to the second forming of clad sheet. The results can be offered the useful knowledge to the forging industry.

並列關鍵字

FEM ； Slab method ； Double-layer clad sheet ； Taguchi methods ； Optimization

國際替代計量

雙層複合板材壓縮成形之有限元素模擬最佳化

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