The grinders are mounted on the entry end of the work rolls. Mill operators can turn grinding on and off from their pulpit. If the mill is rolling very thin, then more wear can appear on the rolls that will need to be removed. The rolls do not need to be removed from the mill. The on-line grinders also keep the strip mill from dictating the rolling schedule.
New lubricants Adding oil to the water spray on hot-strip mills extends the life of rolls.
Dofasco began adding oil to its water spray on its backup rolls late last year. Adding oil to the backup rolls saves oil consumption while increasing lubrication. We found that adding oil halves the wear on rolls. Dofasco sprays water directly onto the work rolls of its hot-strip mill. Spray heads spray the bottom work roll from the exit and entry side of the mill and the top work roll from the exit side.