New rolling method of reversing cold rolling mill

摘要

Areversing cold rolling mill has been suffering from such drawbacks as unrolled portions necessarily produced in head and tail ends reduce yield, and time consuming works including removing of coils, threading of the strip and holding of the strip with the tension reel, which result in decreasing productivity. There has been developed a new rolling method and facility (Zoom-Mill~(TM), Zero-Oriented Off-gauge Minimization) that allows a leader strip and a product coil are connected using a spot welding machine and are finished through even-number passes in a reversing cold rolling mill. It is expected to reduce unrolled portions (improvement of yield) as well as improvement of productivity. The first Zoom-Mill~(TM) was put into practical use and commercial operation started in March 2010. This mill is working very well as intended initially, achieving approximately 1% improvement of product yield of the products immediately after commencement of operation. Productivity of the mill was also sharply increased along quick learning curve.