Abstract
The effect of contact pressure applied on tool surface during cold forging on fatigue life was investigated. Three different contact pressures were applied on heat treated SKH51 specimen surfaces by a forging setup using a universal testing machine. This was followed by tensile test and axial fatigue test for forged and unforged specimens. Dimension, surface hardness and residual stress of the specimen showed a positive relationship with contact pressure while surface roughness did not show a significant difference. The tensile strength and fatigue life showed an increase at lower and medium contact pressures while in high contact pressure both parameters showed a decrease.
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