基于刚粘塑性有限元模拟的汽轮机叶轮模锻的预成形优化  

Preform Optimization of Die Forging Process of a Turbine Wheel Based on Rigid Visco-plastic FEM Simulation

作　　者：胡自化[1] 杨端光[1] 李益锋[1] 张平[1] 

机构地区：[1]湘潭大学机械工程学院,湘潭411105

出　　处：《机械科学与技术》2007年第4期482-486,共5页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(10372087);湖南省自然科学基金项目(04JJ3043);湖南省教育厅科研项目(06B094)资助

摘　　要：针对汽轮机叶轮模锻的预成形设计,本文建立了以打击能耗最低和模具作用载荷最小为目标函数,以完全填充为约束条件,以坯料初始高径比为优化变量的预成形坯料优化方案。利用刚粘塑性有限元方法模拟汽轮机叶轮等温模锻成形过程,具体分析了不同坯料初始高径比对成形载荷、塑性应变能以及分流面的影响。数值模拟结果表明获得的预成形H/D最佳尺寸可明显减少模锻锤击次数和模具磨损。所提出的有限元模拟预成形优化方法十分有效,克服了以往凭经验设计的弊端。As for the preform optimization of die forging process of a turbine wheel, the paper proposed a preformed billet optimization scheme using the objective function that minimizes strain energy consumption and forming load of the die. The scheme takes the constraint conditions of fully filling the die and the billet＇s initial ratio of height to diameter（H/D） as its optimal variables. The rigid visco-plastic FEM was employed to simulate the isothermal die forging process of the turbine wheel, and effects of the billet＇s height to diameter ratio on forming load, plastic strain energy and neutral face were analyzed. Numerical simulation results show that the optimal preform H/D dimension thus obtained can greatly reduce hammering times and die wear. The proposed preform FE simulation optimization scheme is effective and overcomes the drawbacks of previous empirical design.

关 键 词：刚粘塑性有限元 模锻 塑性应变能 预成形优化 分流面 

分 类 号：TG312[金属学及工艺—金属压力加工]