Abstract
For maintenance conform processing of brittle materials (ceramics, glass), the resulting chips are not continuous, as in the case of soft and tough materials, it is called a brittle chip removal range. In this machining zone, the quality of the produced surface may decline (appears the cracks and pitting of the material) and the tool life also decreases. When defining the cutting technology (technological parameters, tool edges, tool cooling / lubrication, etc.), chip removal must be carried out in the ductile range. However, due to tool wear, this range may cross the transition and then it can work in the brittle chip formation zone. In this paper, the machinability of zirconia oxid ceramics has been investigated. The aim of the research is to find out the correlation between the wear of the cutting tool, the volume change of the manufactured pockets and the transitions between the chip formation ranges measured by cracks and pitting deformations on the edge of the machined material. It was observed that they overlap to a large extent, consequently, these observed phenomena can be easily applied for tool wear and quality monitoring for realising condition-based maintenance, it is the main scientific contribution of the paper.
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