Stability criteria for cutting insert and grains of super-hard tools

Abstract

Failure of cutting tools may be the result of the continual wear, although their productivity can also be loosen due to hack, fracture, shelling or other causes, so generally because of breakage. The embedding of the grain to the binding material is also similar to the fixation (brazing etc.) of a super-hard insert tool with definite edge-geometry (diamond, cubic boron nitride). The productivity of the honing, grinding tools and other tools with bound grains (band grinders etc.) depends significantly on the cutting productivity of the active grains. The cutting productivity – beside other factors – depends also on the clamping stability of the grains into the binding material. The quantity and direction of the force that is necessary for the individual grains to break out of the binding material should be examined. The calculated values correlate well with the test results.