Development of Oil-Type Lubricants for Cold Forging Using Phase Transition Behavior Under High-Pressure Conditions

Abstract

AbstractIn the cold forging process, lubricants are essential because they prolong die life and improve product surface quality. In contrast, it is well known that lubricants are exposed to very severe conditions such as high contact pressure and processing-induced high temperatures. Oil-based cold forging lubricants induce processing defects when the oil film is insufficient. In the search for better alternatives, we explored the possibility of phase transition materials that changeover from liquid to solid under high-pressure conditions. In this study, we developed new oil-type cold forging lubricants with phase transition material additives. Moreover, we found that these hybrid materials show superior lubricating performance in the cold forging process to conventional lubricants. These results indicated that phase transition behavior under high-pressure conditions supports more efficient cold forging process lubrication.KeywordsLubricantsCold forgePhase transitionHigh-pressure conditions