Iranian Journal of Manufacturing Engineering

Iranian Journal of Manufacturing Engineering

Investigating the feasibility of producing flanged axial brass parts using the radial-backward extrusion method

Document Type : Original Article

Authors
Hossein Jafarzadeh 1
Elyas Haddadi 2
Moharram Shameli 3
1 Department of Mechanical Engineering, Islamic Azad University, Tabriz branch, Tabriz, Iran
2 Department of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran
3 Space Thrusters Research Institute, Iranian Space Research Center, Tabriz, Iran
10.22034/ijme.2025.533557.2104
Abstract
The present research investigates the feasibility of producing a flanged axial component from C26000 brass alloy using the radial-backward cold extrusion process under both experimental and numerical conditions. To this end, a dedicated die set was designed and manufactured to fabricate the samples, and the final product was produced using a hydraulic press. The process was simulated using DEFORM software, analyzing the effects of die geometry and friction coefficient on the final product characteristics, including hardness distribution, die filling, material flow, and punch force. The highest hardness value (71 Vickers) was observed in the flange region of the workpiece, attributed to work hardening and grain refinement. The friction coefficient, determined through a modified cylinder compression test under grease-lubricated conditions, was calculated to be 0.08. Microstructural analysis revealed that the grain size decreased from an initial value of approximately 400 µm to a range of 220–261 µm across different regions of the component, resulting from high plastic strain and increased dislocation density during the cold forming process. The experimental and numerical force-displacement curves obtained from the radial-backward extrusion process exhibited good agreement, with a maximum discrepancy of 10% in the most critical condition. The results demonstrate that the radial-backward cold extrusion process offers high potential for producing flanged brass components at room temperature, and numerical simulation can effectively predict the material's actual behavior.
Keywords
Radial-Backward Extrusion, 70-30 Brass, Cold Forming, Friction Coefficient
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Iranian Journal of Manufacturing Engineering
Volume 12, Issue 7 - Serial Number 93
September 2025
Pages 49-63