Abstract
The transient tribological phenomenon and premature lubricant breakdown have been widely observed in metal forming, leading to excessive friction at the contact interfaces. In this research, the transient tribological behaviour of a two-phase lubricant were studied under complex loading conditions, featuring abrupt interfacial temperature, contact load, and sliding speed changes, thus representing the severe interfacial conditions observed in warm/hot metal forming applications. The strong experimental evidence indicates that the evolution of friction was attributed to the physical diminution and chemical decomposition effects. As such, a visco-mechanochemical interactive friction model was developed to accurately predict the transient tribological behaviour of the two-phase lubricant under complex loading conditions. The new friction model exhibited close agreements between the modelling and experimental results.
Highlights
The The transient tribological phenomenon is widely observed in a variety of scenarios such as changing lubrication mechanisms [1], third-body effects [2, 3], and varying contact conditions [4]
Friction to 230 °С, premature lubricant breakdown occurred, and the transient friction values were affected by lubricant properties and interfacial temperature which resulted in different peak forming forces [11]
The transient tribological behaviours of a two-phase lubricant were investigated under the complex loading conditions, including abrupt changes in load, speed, and temperature at the tool/workpiece interface
Summary
The The transient tribological phenomenon is widely observed in a variety of scenarios such as changing lubrication mechanisms [1], third-body effects [2, 3], and varying contact conditions [4]. In metal forming processes, the contact conditions at the tool/workpiece interfaces vary historically and spatially [5,6,7], leading to complex loading conditions featuring abrupt temperature, load, and speed changes, which could affect the viscosity and mechanochemical behaviour of lubricants. This may lead to premature lubricant breakdown, resulting in poor surface quality of the formed components and reduced tool life [8,9,10,11,12,13]. In the friction tests at the interfacial temperature of up Friction to 230 °С, premature lubricant breakdown occurred, and the transient friction values were affected by lubricant properties and interfacial temperature which resulted in different peak forming forces [11]
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