A CUTTING TOOL INSERT WITH BUILT-IN PROVISION FOR DETECTING FLANK WEAR OF A PREDETERMINED VALUE

摘要

A cutting tool insert with built-in provision for detecting flank wear of a predetermined value, comprising a rake face, a flank face and a cutting., edge, wherein the region of the flank face below the cutting edge is stepped to form an additional edge, whereby the cutting edge of the said ^insert normally projects outwardly, beyond the additional edge; and wherein the said region is structurally weakened, such that whenever flank , wear, during use of the said insert on a work surface, reaches a predetermined value, the additional edge comes 'Into contact with the work surface, to cause a fracture of the insert at the said region and thus result in sudden release of acoustic energy detectable by an acoustic sensor.