基于复合设计的大型锻件微观组织优化

Microstructure Optimization of Heavy Forgings Based on Composite Design

为了对大型锻件微观组织进行控制,提出了一种基于复合设计和数值模拟的优化设计方法,优化设计以始锻温度和锻模击打速度为优化设计变量,以终锻件晶粒均匀细小为微观组织性能评价指标。建立了锻造微观组织性能评价指标和其影响因素间的近似函数关系,并基于回归模型获得了最优锻造工艺参数。以圆柱体两步镦粗过程为例对所提出的优化方法进行了验证,优化结果表明:该方法结合了回归分析和正交试验设计的优点,可以有效缩短计算时间,对控制大型锻件的微观组织具有一定指导作用。

In order to control the microstructure of heavy forgings, an optimization method based on composite design and numerical simulation was proposed. Temperature and speed of die were taken as design variables, uniform and small microstructure of final forging was considered into the objective function. Approximate function relationship was built between the function and design variables, optimal forging process parameters were acquired based on the regressive model. This optimization method was verified by applying it to two- step upsetting cylinder. This method combines the advantages of regression analysis and orthogonal experimental design, avoids large number of simulations and reduces computing time,it is a guide to control the microstructure of heavy forgings.