Application And Research On Back-up Roll Lubricating Technique In Hot-rolling Mill

In recent years, the hot rolled strip steel rolling unit has been developed towards high speed and high efficiency, its total output in the hot rolled steel proportion is more and more big. In order to reduce energy consumption, improve product quality and production efficiency, process lubrication technology has been widely used and completed in practice in strip production. It is common to use hot rolling oil in foreign hot-rolling factory, but in domestic, hot rolling oil injection device was only installed on the finishing mill group, and all of them put the lubricate devices work roll beneath the cutting water plate or above the water cutting water plate, there is no rolling unit using back-up roll lubrication technology.The finishing mill group of Anshan Iron and Steel was designed to put the lubricate devices work roll beneath the cutting water plate, but the environment for using the hot rolling oil is bad, it makes the effect of hot rolling oil is difficult to perform. In order to solve the problem of the cooling input of the roll gap and the sealing water of the water cut plate are not strict, Anshan Iron and Steel reforms the finishing mill group. In the absorbing foreign support roller rolling lubrication technology, on the basis of Anshan Iron and Steel independent development and design a set of supporting roller processing lubrication system.Principle and development prospect of hot rolling process in Anshan Iron and Steel hot rolled strip steel factory support roller lubrication technology development are analyzed, and the content includes: supporting roller rolling lubrication system design, the support roller lubrication key control technology and process technology development, supporting roller lubrication results and benefits calculation, etc. Paper introduced the support roller rolling oil spray header design, support roller rolling oil water cutting board device design scheme, hot rolling oil and water system, steam heating device. Through a large number of industrial test, we find out the best hot rolling oil flow control scheme and the replacement of the finishing work roll and rolling oil injection timing control method, and the hot rolling oil on the surface of the work roll, adhesion were measured, it is concluded that the best hot rolling lubrication technique. Through experiment and application an effective measure was found, namely “the support roller lubrication”, the advantage is cooling and hot rolling oil can non-interference in each other, roll gap into at the same time, give full play to the two to prevent the work roll surface oxidation film loss and improve the surface quality of strip steel. By statistics, the support roller used after lubrication, which greatly reduces the working roll and supporting roll wear and prolong the roll change cycle of 50%, to improve the support roll change cycle and shape control has played a positive role, the benefit is more than 3 million RMB, the Anshan Iron and Steel hot-rolled strip steel factory become the first successful specimen of domestic support roller hot-rolled strip production line of hot rolling oil.