Tribological properties of emulsions for strip cold rolling

Different base oils and additives were used to compound emulsions for strip rolling. The influences of base oils and additives on the tribological properties of the rolling emulsions were investigated with a four-ball friction and wear testing machine. The lubricating effect of the rolling emulsions was actually verified by cold rolling experiment. It is shown that kinematical viscosity and saponification number are still the main parameters for choosing base oils, and the compatibility of based oils and additives has a certain impact on the performance of the rolling emulsions. Additives can highly influence the tribological properties of the rolling emulsions. Nano-hexagonal boron nitride (nano-h-BN) not only has excellent tribological properties by itself, but also plays a good collaborative role with traditional additives. In the cold-rolling process lubricated by rolling emulsions with nano-h-BN additives, all the rolling characteristic parameters such as rolling pressure and rolling power significantly decrease, and the good effects of nano-lubrication are initially embodied.