Fracture Resistance of the Edge of Cemented Carbide Cutting Tool

The method to evaluate fracture resistance and damageability of cutting edge areas, which avoids drawbacks arising from the use of sharp indenter is proposed. The testing is a loading element with the cylindrical surface is moving along the edge of the cutting plate and scanning one. The influence of columnar wear-resistant PVD - coating TiAlN and magnetic abrasive treatment (MAT) on the mechanical behavior of cutting edges of carbide cutting tool under local loading is studied. The experimental evaluation of the parameters of damageability and fracture resistance for cemented carbide cutting tool in its original state, with PVD - coating TiAlN and after MAT is obtained. The load values on the indenter Pmin, when chips are not formed and P100, which is a border for the transition from microchipping to other types of macro fracture, are detected. The method of scanning and results of the research can be used to estimate the characteristics of local strength and efficiency of the modification of cemented carbide cutting tool for heavy processing machines.