摘要
近似模型法是目前最有代表性的高效优化方法。因基于多项式的近似模型很难满足板料成形的高度非线性,所以基于Kriging近似模型法,以翼子板的各拉深筋单位长度上所受的拉深筋阻力及压边力为设计变量,以成形后板料的最小厚度为响应量,建立近似模型。通过自适应模拟退火算法寻优,并约束最小厚度的变化范围,提高优化效率。通过优化,成形后板料的最小厚度从0.521mm增加至0.544mm,消除了局部破裂趋势,有效地改善了翼子板的成形质量。研究表明,Kriging近似模型法对板料成形有较高的精度。
Surrogate model is the most representative efficient optimization method. Since the surrogate model based on polynomial is hard to satisfy the high non-linearity of the sheet forming, in this paper, based on Kriging approximation model, taking the blank holder force and the drawbead forces per unit length of drawbeads for the fender as design variables and minimum sheet thickness after forming as the response variable, the surrogate model was constructed. The self-adaptive simulated annealing algorithm was adopted to search the optimum solutions, and the variation range of the minimum thickness was restricted to improve the optimization efficiency. After optimization, the minimum sheet thickness after forming is increased from 0. 521 mm to 0. 544 mm, the local burst trend is eliminated and the forming quality of the fender is improved effectively. Research shows that Kriging model has high prediction accuracy for sheet metal forming.
出处
《模具技术》
2012年第2期1-5,共5页
Die and Mould Technology
基金
国家重大科技专项课题资助项目(2011zx04016-051)
国家重大科技专项课题资助项目(2010zx04014-072)
