CBN fracture behaviour - characterisation and simulation of the fracture behaviour of CBN grain types as a function of crystal shape, grain orientation and dressing parameters

 

Due to the physical properties of the material, cubic boron nitride (CBN) is mainly used as the grain material of the grinding wheel when machining high-hardness materials. The application preparation of the grinding wheel plays an important role in the design of the grinding process, as it is the latter that is decisively responsible for the process result. The grinding wheel topography is therefore prepared specifically for the respective application. This is done by means of a dressing process which generates the grinding wheel topography through the mechanisms of action, such as grain breakage, grain splinters, grain breakage or grain deformation. The fracture behaviour of the grains, which in addition to the dressing parameters also depends on properties such as the existing grain morphology, the grain orientation and the embedding depth in the bond, has so far only been insufficiently researched.

The overriding goal of this research project is an explanatory model for characterizing the fracture behavior of CBN grain materials, taking into account the crystal shape of the grain type, the crystal orientation and the dressing parameters.