New methods in qualification of cutting performance during drilling operation

The improvement in cutting performance of the innovative tools cannot be linked solely to one criterion. The judgement of the cutting performance, made based on some simple factors (chip formation, comparison of surface roughness, edge durability etc.), is quite subjective. During the qualification, based on instrumental measurements, effect of those factors will be considered as well which can serve as the base of the tool monitoring with on-line registration of the wear process. In our present article we are going to introduce a qualification method, worked out for innovative drilling tools and applied successfully: it is able to characterize the effectiveness of the innovation based on some features of the cutting performance (force effect, torque demand), measured at the same time. The elaborated method makes it possible to promote data generation in order to create calculation formulas with the limiting conditions during the planning phase of the machining technology and to improve the process security.