Determination of the mathematical model of the micro cutting force for the granite Jošanica in the ductile mode

Анотація

Micro cutting represents one modern approach of processing the materials in order to achieve parts that feature high surface quality with low intensity of residual cracks. Mechanisms that occur during micro cutting are not similar to those that occur during macro cutting. Even in the case of micro cutting brittle materials, the micro cutting mechanism becomes much more complex. The possibility of processing brittle materials in a ductile mode allows reduction of the intensity of the residual cracks within the material, since there is no initialization of the cracks within the material in this regime. However, although in this mode part is only plastically deformed, the intensity values of the components of the cutting force can vary considerably, especially if the processing is carried out on stone-based materials that are highly heterogeneous. In order to adequately implement the micro cutting, it is necessary to know the value of the components of the micro cutting force for the desired processing conditions, which is one of the quality indicators for the micro cutting. To enable this, the developed mathematical model gives a precise picture of the value of the components of the cutting force within the values of the tool tip radius from R0.15 to R0.2 [mm], as well as the micro cutting speeds from 15 to 25 [m/s].