DOI: https://doi.org/10.20535/2521-1943.2017.80.109198

Numerical simulation of cold forging process to investigate folding defect in enclosed dies

Payman Abhari

Abstract


In the precision forging industries, improving product quality and reducing product cost are important cases. Enclosed-die forging is one of the precision forging processes. In this paper, the cold forging process in the enclosed dies by using kinematical mechanism to create precision parts is considered. The numerical simulation techniques by using the rigid-plastic finite element method (FEM) as software QForm 2D have been applied to investigate defect as a folding defect in this paper. Based on the finite element simulations, forming characteristics such as deformation patterns (gridlines distortion), distributions of effective strain and stress at several stages of process as single-ended and double-ended with different forming parameters to avoid folding defect in cold forging process have been investigated. The lower die velocity vs. geometric ratio by using this numerical simulation method has been determined.

Keywords


Cold forging; enclosed die; material flow; folding defect; numerical simulation; stress-strain state

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References


Santos, A.D., Duarte, J.F., Reis, A., da Rocha, B., Neto, R. and Paiva, R. (2001), The use of finite element simulation for optimization of metal forming and tool design. J. Mater. Process. Technol. 119.152-157.

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Abhari, P. (2017), Investigation of fracture moment in radial extrusion process by finite element method, XVIII International scientific conference, “New technologies and achievements in metallurgy, material engineering, production engineering and physics”, Series: Monografie, Częstochowa, Poland, No 68, pp. 97–101.

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GOST Style Citations


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