Diagnosing Cold Mill Chatter Through Mill Stand Hydraulic Monitoring and Roll Shop Grinder Testing

摘要

On Sept. 24, 2003, a chatter reduction team was formed in order to determine why USS-POSCO Industries' (UPI) tandem cold mill (TCM) was experiencing an abnormally high incidence of delays (roll changes) due to what had been termed "bearing chatter." Figure 1 indicates that the number of roll changes due to bearing chatter could be as high as approximately three roll changes a week plus or minus two roll changes. The average number of roll changes was unacceptable, and the variability was too great, denoting a process out of control.