粉末冶金技术2017，Vol.35Issue(1)：15-22,8.
粉末冷压成形弹性后效及非同步双向压制模拟研究
Numerical simulation of spring back and non-synchronous bidirectional pressing in powder cold pressing
尤萌萌 1潘诗琰 1申小平 2鞠志勇 2范沧3
作者信息
- 1. 南京理工大学材料科学与工程学院,南京210094
- 2. 南京理工大学工程训练中心,南京210094
- 3. 泰安皆瑞金属科技有限公司,泰安271000
- 折叠
摘要
Abstract
Based on the updated Lagrangian method and large deformation elastic-plastic theory,the fimite element method was used to simulate and investigate the spring back of compacting metal powder at room temperature and the density distribution of compacts under the non-synchronous bidirectional pressing.The results show a linear relationship between the aspect ratio and the decrease of node density after ejection,which can effectively guide the mold design and ensure the dimensional accuracy of compacts.Being close to the moving punch,the accumulation of internal deformation energy is relatively high,thus the decreases of node density after ejection and spring back are relatively significant.However,the redistribution of stress leads to a slight increase of density away from the pressing punch.Reducing friction can decrease both the overall spring back and the decline of node density.To produce the complex powder metallurgy components with stages,the non-synchronous bidirectional pressing method is superior to the synchronous bidirectional pressing method.The density uniformity of compacts achieved by the non-synchronous bidirectional pressing method depends on the reductions of two punches.In the non-synchronous bidirectional pressing,if the reduction of the first moving punch is close to the necessary total reduction,and a slight reverse pressing is performed by the other punch until the final size of compact is achieved,then the uniformity of density by the non-synchronous bidirectional pressing can be greatly improved,and even may exceed that of the synchronous bidirectional pressing.关键词
冷压/弹性后效/非同步双向压制/密度分布/有限元Key words
cold pressing/spring back/non-synchronous bidirectional pressing/density distribution/finite element分类
矿业与冶金引用本文复制引用
尤萌萌,潘诗琰,申小平,鞠志勇,范沧..粉末冷压成形弹性后效及非同步双向压制模拟研究[J].粉末冶金技术,2017,35(1):15-22,8.
