Abstract
Recently, higher quality of the surface of cold rolling strip has been demanded. As a result, the quality level which was satisfactory before is not now. In particular, we need higher quality flat plate in order to produce a better gloss and mirror pattern for the outside plate of the car and wall plate.
Therefore, we investigated a relation between the vibration of machine and that of steel sheet in order to explain the source of chatter marks, which can be found only by skilled inspector. As a result it is confirmed that chatter marks which are generated by skin pass mill and tension leveler are resonance phenomena which arises due to the natural frequencies of the roll and the roll drive system as well as that of the transverse oscillation of steel sheet. To surpress the chatter marks, it is necesarry to control the vibration of the roll and the side walls.
