STUDY OF EMULSION STABILITY OF ROLLING OILS
Oil in water (O/W) type of emulsions are being used in different industrial metal working applications like rolling, cutting etc. Among these, one of the major applications is cold rolling. This (O/W) emulsion provides cooling, lubrication and rust prevention to steel sheet and work rolls. The oil separation characteristics of emulsion controls the coefficient of friction at roll bite and ease the rolling process. The performance of the rolling oil is greatly dependent on the proper balanced emulsion stability along with the presence of suitable performance additives.
The hardness of water, pH, stirring, and temperature have direct bearing on the stability and instability of rolling oil emulsion particularly in long term. The present paper describes the effect of type of emulsifiers, temperature & water hardness on the rolling oil emulsion stability by measuring the instability index using Dispersion Analyser and its correlation studies with conventional method.