CAJ | 학술논문

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。
섬광선、광량대화압인불족시금은기념폐압인성형중적주요결함。기우실험실연발적압인성형모의계통COINFORM,대기념폐적압인과정진행료수치모의。재대광량대결함분석적기출상,건립료경향마찰공모형예측광량대적위치。결합실험결과화성형모의중금속적류동정황,분석료섬광선적형성궤리。장원유산법진행개진,근거계산과정중배병표면화모구적접촉상태학정결속계산시각,병이계산결속시적배병반작용력래예측실제성형시소수적압인력。실험결과표명,소예측적압인력대압인불족결함적소제시유효적。
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.