An assessment of numerical parameter influencing springback of magnesium alloy forming process

• Main Authors: Wen-Long Chang, 張文龍
• Other Authors: Bor-Tsuen Lin
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/17266119679077081429

碩士 === 國立高雄第一科技大學 === 機械與自動化工程所 === 93 === The aim of this thesis is to assess of numerical parameter influencing spring-back of magnesium alloy(AZ31) forming process. A Taguchi method is applied to look for the factors resulting minimum spring back of magnesium alloy with experiment and analysis for L die. In this work, numerical parameters influencing spring back have been evaluated quantitatively using experiment and analysis. The parameters important for spring back have been assessed form comparison of the numerical results with the experimental results. The factors of the spring back effect in this study include temperature, the radius of punch, the forming depth, and die clearance with three levels respectively. They have been assessed comprehensively and quantitatively using the Taguchi table, L27. After Taguchi experiment we can find the best levels that are 200 celsius, 3 mm radius of punch, 7 mm forming depth and 0.5 mm die clearance. It has been shown that temperature is the most significant factor influencing spring back. The parameters of the spring back influence in this study include young’s modulus, hardening modulus, anisotropic hardening parameter, and yield stress. Each temperature parameters have been evaluated quantitatively using the Taguchi method in order to reduce deviation. The results of the maximum deviation of predicted angle after spring back form experimental are from 23% down to 10%. The temperature is proportional to the young’s modulus of magnesium, but disproportional to the yield stress.