Through the traditional hot rolling mill need to wear rods, as well as the mandrel cooling time, perforation need to wait for the problem of hot rolling mill, the company combined with the actual problems of rolling mill and customer requirements, the traditional hot rolling process has been improved, To produce 144-type double-core rod recycling three-roll hot rolling unit, the unit in advance to the mandrel into the barracks, while rolling side of the pre-wear, reduce the waiting time, but also effective cooling mandrel, improve efficiency, Minute 2!