US EPA

7456989 

Journal Article 

辊式微楔横轧数理建模及仿真分析 

Pan, XL; Wang, MT; Li, XT; Cao, MF; Zhang, XY; Wang, JC 

2018 

Beijing Res. Inst. of Mechanical and Elec. Technology 

25 

1 

66-71 

Chinese 

10.3969/j.issn.1007-2012.2018.01.010 

In the theoretical research stage of micro cross wedge rolling technology(MCWR), the combination of accurate finite element model and multi crystal plasticity model can optimize the forming process of MCWR. Firstly, the three-dimensional Voronoi polyhedron was used to study the microscopic structure of the real material and a smooth model and a rough model based on the principle of Voronoi were established. Then the plastic properties and the initial orientation were considered separately for each grain and two kinds of polycrystalline plastic models were established. Finally, the finite element analysis model of micro roll forming MCWR was established by combining the smooth/rough Voronoi geometric model with the empirical model.After analyzing the influence of different factors on forming quality of workpiece by using ABAQUS for simulation, it is found that in MCRW, the rough model, mesh size of 0.03 mm, friction coefficient of 0.8 and the grain number of 82 in workpiece should be chosen to make the workpiece forming quality the best. © 2018, Editorial Board of Journal of Plasticity Engineering. All right reserved. 

Crystal plasticity model; Initial grain orientation; Numerical simulation; Roll micro cross wedge rolling; Voronoi polyhedron