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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2010

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Forging tools modification with graphene-like solid lubricant nanoparticles

Leshchynsky V., Ignatiev M., Wiśniewska-Weinert H., Borowski J., Rybak T., Dobrovnik I.

Journal of Achievements in Materials and Manufacturing Engineering

2010

Vol. 43, nr 1

341--348

Purpose: Working conditions of forging tools have become severer with the years. To increase their wear and heat resistance the surface of the tool is coated by CVD/PVD methods. Relatively high friction coefficient of coatings results in high friction losses and low durability of coating films due to high shear stress at tool–workpiece interface. That is why improved self-lubricating system should be developed. Combination of modern coatings (nanostructured, nanolayers, nanocomposites, etc.) with self-lubricating tool design and application of solid lubricant MoS2 and WS2 graphene-like nanoparticles is very promising and effective way to solve existing forging tool problems. Design/methodology/approach: Laser micro-machining technology was applied to fabricate the network of micro-channels which serve like reservoirs for encapsulation of solid lubricant nanoparticles into tool body. Wide ranges of tribological tests on T-10 ball-on-disc tester were carried out to define the optimal geometry and network configuration of micro-channels ensuring generation of a lubricious transfer film at the tribological contact. Findings: As a result, increased tool durability and high forging precision could be reached. Analysis of failure mechanisms for different forging tools were carried out. It was found that one of the important reasons of tool wear is a high friction coefficient between treated material and the tool. Graphene-like nanoparticles of MoS2 solid lubricant were produced by Rolling Cleavage Technology. Paper consist SEM, TEM and AFM analysis of applied coatings and solid lubricant particles. Research limitations/implications: The continuous supply to a sliding area of nanoparticles will be for the first time applied to decrease high shear stress at an interface between forging tool and treated material.The next research step will be the transfer of the developed methods of self-lubrication from samples to real cold forging tools. Originality/value: Analysis of failure mechanisms for different forging tools were carried out.