Emulsion Type Rolling Oil with High Performance for Friction Pickup in High Speed Cold Rolling

Abstract

The prevention of friction pickup, which occurs under the condition in high rolling reduction and/or high speed, is required to improve productivity in cold steel rolling. In order to prevent the friction pickup at high speed cold rolling, new rolling oils of emulsion type are developed in this paper. The emulsions consist of a synthetic ester with a viscosity of 100cSt, emulsifier and additive. In the experiments, the emulsion concentration is changed, and two emulsifiers and several additives are used. The effects of emulsion concentration, emulsifier, extreme-pressure agent and new additive on friction pickup are investigated. For the evaluation of friction pickup, the sliding-rolling simulation testing machine is used. The experimental results obtained are as follows.
(1) When the emulsion concentration and the emulsion particle size increased, the limit reduction of friction pickup increased.
(2) When the extreme-pressure agent of P system or inactive S system was added, the limit reduction of friction pickup did not increase.
(3) When new additives of Ca sulfonate and extreme-pressure agent of active S system were used, the limit reduction of friction pickup increased largely.