Finite element method analysis of cold forging for deformation and densification of Mo alloyed sintered steel

4th International Conference on Mechanical Engineering Research

Kamakoshi, Y.^1,2 ; Nishida, S.^3 ; Kanbe, K.^2 ; Shohji, I.^2

Dept. Applicational-Mechanical Engineering, Gunma Industrial Technology Center, Maebashi, Gunma

379-2147, Japan^1

Division of Mechanical Science and Technology, Graduate School of Gunma University, Kiryu, Gunma

376-8515, Japan^2

Division of Mechanical Science and Technology, Graduate School of Gunma University, Ota, Gunma

373-0057, Japan^3

关键词: Alloyed sintered steels;    Analysis softwares;    Automobile product;    Backward extrusion;    Cold forging process;    Finite element method analysis;    Improvement methods;    Powder metallurgy (P/M);   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/257/1/012012/pdf
DOI  :  10.1088/1757-899X/257/1/012012

来源: IOP

【 摘 要 】

In recent years, powder metallurgy (P/M) materials have been expected to be applied to automobile products. Then, not only high cost performance but also more strength, wear resistance, long-life and so on are required for P/M materials. As an improvement method of mechanical properties of P/M materials, a densification is expected to be one of effective processes. In this study, to examine behaviours of the densification of Mo-alloyed sintered steel in a cold-forging process, finite element method (FEM) analysis was performed. Firstly, a columnar specimen was cut out from the inner part of a sintered specimen and a load-stroke diagram was obtained by the compression test. 2D FEM analysis was performed using the obtained load-stroke diagram. To correct the errors of stress between the porous mode and the rigid-elastic mode of analysis software, the analysis of a polynominal approximation was performed. As a result, the modified true stress-true strain diagram was obtained for the sintered steel with the densification. Afterwards, 3D FEM analysis of backward extrusion was carried out using the modified true stress-true strain diagram. It was confirmed that both the shape and density of the sintered steel analyzed by new FEM analysis that we suggest correspond well with experimental ones.