Influence of surface circular pit micro-texture on tribological properties of DC53 die steel
To explore the influence of micro-texture on the surface tribological properties of DC53 cold-working die steel,based on the fi-nite element method,the optimum depth of circular pit micro-texture on the surface of die steel was studied.The micro-texture die steel samples of circular pit with different surface densities were machined by femtosecond laser,and the friction and wear experiments were carried out to study the influence law of surface density on the tribological properties of die steel under different lubrication conditions.The results show that the circular pit micro-texture on the surface of DC53 cold-working die steel exhibits the maximum oil film bearing capacity and the minimum friction factor when the diameter is Φ140 μm and the texture depth is 50 μm.With the increase of the surface density of the circular pit micro-texture,the friction factor on the surface of die steel first decreases and then increases with full lubrication,and the average friction factor is the smallest when the surface density is 20％,which is 51.35％lower than that of the non-texture die steel;with less oil lubrication and dry friction,the surface friction factor of die steel gradually decreases with the increase of surface density.When the surface density is 30％,the average friction factor of die steel surface is the smallest,which is 35.84％and 15.02％lower than that of non-textured die steel,respectively.The existence of micro-texture improves the friction reduction property of die steel surface un-der different lubrication conditions,and the effect is the best with full lubrication.The adhesive wear of die steel surface is also signifi-cantly improved with dry friction.
surface micro-texturecold-working die steellubrication conditionnumerical simulationfriction and wear
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