摘要
提出了一种基于有限元分析和序列二次规划的热锻成形工艺多目标优化方法,优化目标包含锻件的内部损伤值和变形均匀性两个方面。用锻件所有单元的最大损伤值作为衡量锻件变形损伤的指标,用锻件所有单元体的等效应变与整个终锻件的平均等效应变的均方差,作为锻件变形均匀性的指标,构造了多目标优化问题的评价函数。在设计过程中,优化变形工艺参数使得工件内部损伤值最小,同时工件内部变形均匀。以零件毛坯的初始高径比为设计变量,建立了热锻成形过程多目标优化设计的数学模型。应用该方法对齿轮齿圈毛坯非等温热锻成形工艺参数进行优化,取得了良好的效果。
A method of forging process multiple-objective optimization is proposed based on finite element analysis and Sequential Quadratic Programming.The damage of the final forging and its deformation uniformity are considered into the multiple-objective function. The deformation damage object is defined as the max damage of all elements in net forging and the deformation uniformity object is defined as mean square deviation of the equivalent-strain in each element and the average equivalent-strain of all elements.The evaluation function of multiple-objective design optimization is constructed.In order to make the billet deform uniformly and damage minimization during forging process, the finite element analysis technique is adopted to verify the design and calculate the objective function and technological parameters are opt lished, the design parameter is the initial H/D ratio of billet. Finally, the case study is conducted for a gear ring billet nonisothermal hot forging process.The optimal initial H/D ratio of the billet is obtained.
出处
《塑性工程学报》
EI
CAS
CSCD
北大核心
2005年第4期80-84,共5页
Journal of Plasticity Engineering
关键词
锻造
损伤
变形均匀性
数值模拟
设计优化
forging;damage;deformation uniformity;numerical simulation;design optimization