Development of Size-Free Rolling Technology for Wire Rod and Bar Using 4-Roll Mill

摘要

Kawasaki Steel has developed a new size-free rolling technology using a 4-roll mill in order to supply products of optimum size for various working processes and of high-dimensional accuracy. In April 199.4, this technology was introduced to the bar mill line of the wire rod and bar mill at Mizushima Works for the first time in the world. This technology makes maximum use of the advantages of the 4-roll method, which is useful in securing higher dimensional accuracy and a wider size-free range than are possible with the 2-roll and 3-roll methods now in practical use. At the same time, a number of new technologies, including a 2-roll drive system, were applied to realized the rolling mill with the excellent operability and maintainability which are indispensable in commercial equipment, resulting in a successful development of a practical mill.