Title of article :
Numerical and experimental study of the effect of the process parameters on the void evolution in the cold extrusion of rods
Author/Authors :
Rajabzadeh Gatabi, Moein Mechanical Engineering Department - Babol Noshirvani University of Technology - Babol - Iran , Afrasiab, Hamed Mechanical Engineering Department - Babol University of Technology - Babol - Iran , Moazemi Goudarzi, Ali Mechanical Engineering Department - Babol Noshirvani University of Technology - Babol - Iran
Pages :
8
From page :
287
To page :
294
Abstract :
Elimination of defects such as voids and internal cavities is required in metal forming processes to avoid premature failure of mechanical components during service. In this paper, the effect of different parameters on the void closure behavior is studied in the cold extrusion of rods. A three dimensional nonlinear dynamic finite element model is developed for this purpose. Experiments are also performed on aluminum samples to verify the accuracy of the finite element model. Results of the developed model are in good agreement with experimental findings. It is observed that voids contract in all directions during the direct extrusion which is in contrast to some other metal forming processes like forging and rolling. Effect of parameters such as die semi-angle, friction coefficient and void location on the void evolution is systematically investigated and discussed. The results of this study can help industries using metal extrusion for optimized design and control of the process to reduce voids and porosity and increase the strength of their product.
Keywords :
Void evolution , Cold extrusion , Finite Element Method , Die geometry , Void location
Journal title :
Scientia Iranica(Transactions B:Mechanical Engineering)
Serial Year :
2020
Record number :
2554380
Link To Document :
بازگشت