DAMAGE ANALYSIS OF DEGRADED SLITTING KNIFE

This study analyzed the damage to a slitting knife after cutting steel sheet s . Damages to the structure were observed and wear tests were conducted. In addition, the degradation on the damaged and undamaged parts was compared with a Vickers hardness test. Weibull statistical analysis was carried out in order to evaluate the reliabi lity of the Vickers h ardness measured data. Spalling of the edge portion occurred by degradation during use over a long period. Rough parts in the specimens were caused by damage because the slitting knife was used for 1 year. The friction coefficient and wear loss at the damaged parts of the knife edge were slightly larger from shock due to repetitive cutting operation. The Vickers hardness followed a two - parameter Weibull probability distribution