12th Tooling Conference & Exhibition - Tooling 2022

In hot metal forming processes, the temperature of the forming tool progressively increases under serial production conditions. Water based two-phase lubricants may be applied to cool the forming tool and moderate temperature, in which the liquid agent would evaporate or decompose rapidly with dry matter deposited on the tooling surface during the dwelling time before the forming process commences. In this study, an interactive friction model for a two-phase lubricant was developed to predict the transient lubricant behaviours, i.e., predicting the effects of tool temperature and dwelling time on the friction coefficient evolution and lubricant breakdown. Friction tests between a warm pin and hot aluminium workpiece were conducted using the advanced friction testing system, Tribo-Mate, to validate the modelling results.