金银纪念币压印成形中的缺陷预测  

Defect Prediction in Coining Process for Au-Ag Commemorative Coins

作　　者：钟文[1] 柳玉起[1] 许江平[1] 胡云明 李胜强 赖茂明 孙志国 

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,武汉430074 [2]沈阳造币有限公司,沈阳110042

出　　处：《中国机械工程》2012年第1期109-112,共4页China Mechanical Engineering

摘　　要：闪光线、光亮带和压印不足是金银纪念币压印成形中的主要缺陷。基于实验室研发的压印成形模拟系统COINFORM,对纪念币的压印过程进行了数值模拟。在对光亮带缺陷分析的基础上,建立了径向摩擦功模型预测光亮带的位置。结合实验结果和成形模拟中金属的流动情况,分析了闪光线的形成机理。将原有算法进行改进,根据计算过程中坯饼表面和模具的接触状态确定结束计算时刻,并以计算结束时的坯饼反作用力来预测实际成形时所需的压印力。实验结果表明,所预测的压印力对压印不足缺陷的消除是有效的。Flash line, light band and insufficient filling are the main defects in coining process for Au-Ag commemorative coins. Based on a special-purpose FEM software-COINFORM, numerical simulations for coinages were carried out. A radial friction power model was built for the prediction of light band defects. With the analysis of metal flow, the mechanism of flash line was studied on the basis of the experimental results. The former algorithm was improved that the simulation would stop only when the blank was fully contacted with the forming tools in all direction. The reaction force of blank at the stop time predicts the forming force in coining. Experimental results show that the predicted force is valid for eliminating insufficient filling.

关 键 词：金银纪念币 压印成形 缺陷预测 COINFORM 

分 类 号：TG379[金属学及工艺—金属压力加工] TP391.9[自动化与计算机技术—计算机应用技术]