基于纪念币压印成形数值模拟的模具受力分析方法

Analysis methods for die force based on numerical simulation of commemorative coin forming process

针对纪念币压印过程中模具受力问题,采用一种自行开发的有限元软件Coin FEM进行数值模拟和载荷映射的分析。首先,通过压印数值模拟获取坯饼在模具作用下的受力数据,讨论了压印成形和模具力分析的实现过程,以及连接这两个过程的边界力映射算法的关键技术。然后将获取的作用力映射到模具上,进而进行模具受力分析。最后,采用商用有限元软件Deform 3D对该压印成形以及模具受力进行数值模拟分析,并与本文提出的方法进行了对比验证,吻合较好。纪念币压印数值模拟的结果表明:通过背景网格进行载荷映射的模具受力分析方法具有可行性。坯饼的模拟结果分布与实验结果保持一致,为坯饼与模具之间的作用力的正确性提供保障。通过载荷映射的方法,可以获得模具节点的受力信息,进而求得模具的应力应变。与商用软件模拟结果相比,所提出的方法显著提高了计算效率并确保了结果的准确性。

A proposed analysis method for the force on the die during the coining process of commemorative coins is introduced.After numerical simulation of the coining process,some force data of the die's pressure on the workpiece are obtained.The implementation process of coin forming and die force analysis is discussed,as well as the key technologies for boundary force mapping algorithm that connects these two processes.And then the force is mapped onto the die for die force analysis.Finally,commercial finite element software Deform 3D is used for numerical simulation and analysis of the coin forming and die force,and a comparison validation is performed with the proposed method in this paper,showing perfect agreement.The die force analysis method,which utilizes load mapping through background grids in numerical simulation of commemorative coin forming is feasible.The simulated distribution of the workpiece s results is consistent with the experimental results,which provides a guarantee for the correctness of the interaction force between the workpiece and the die.By using the load mapping method,it is possible to obtain force information for the die nodes and subsequently calculate the die stress and strain.Compared to the simulation results from commercial software,the proposed method significantly improves computational efficiency and ensures result accuracy.