In cold rolling, degradation of emulsion-type coolant is a crucial matter in terms of the stability of cold rolling operation or its running cost. Thus, the authors have newly developed a simulator that can investigate degradation of emulsion-type coolant. The simulator is equipped with a circulation system of the coolant, a heating system for inducing heating-degradation and a two-roller friction machine for inducing degradation due to active wear particles. The results showed that mean diameter fluctuation of the coolant during a degradation simulation test showed good correlation with that in an actual mill, thus indicating that the simulator can simulate the degradation of coolant in an actual mill. The results also revealed that the emulsifier type of coolant strongly affects degradation behavior.
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