摘要
采用有限元、灵敏度分析与工程优化算法相结合的方法,以能充满型腔且少无飞边的终锻件的晶粒度分布均匀化为目标,以预成形形状为优化对象,对锻造成形过程的微观组织进行了优化设计。采用三次B样条函数描述预成形模具形状,并以B样条函数的控制点坐标为设计变量,给出了锻造过程微观组织演变的模型,建立了衡量锻件充型性能及微观组织分布均匀化的目标函数,推导了目标函数对设计变量的灵敏度,给出了优化设计步骤。并以一典型H型锻件为例,对锻件的微观组织进行了优化,取得了较好的结果。
The microstructure optimal design in hot forging process is presented at the aim of obtaining the net-shape parts and the uniformity of the grain distribution in the final parts by means of changing the preform die shapes, using the finite element method, sensitivity analysis and the engineering optimization algorithm. The preform die shape is represented by cubic B-spline curves and the control points of B-spline are used as the design variables. The model of the microstructure evolution and the objective function are established. The sensitivity of the objective function with respect to the design variables is developed and the optimization procedure is given. Finally, the forming process of a typical H-shaped axisymmetric disk is illustrated as an example and it shows good results.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2007年第6期6-10,共5页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(50475130)
教育部新世纪优秀人才计划
国家杰出青年科学基金资助项目(50425517)
关键词
微观组织优化
锻造
灵敏度分析
预成形设计
形状优化
microstructure optimization
forging
sensitivity analysis
preform design
shape optimization
