QUALITY CONTROL OF MACHINED SURFACES OF PARTS MADE OF FERRO-CERAMIC MATERIALS IN THEIR PRODUCTION

Information support of technological capabilities for defect-free machining of products made of magnetically hard alloys prone to cracking is proposed, which consists in establishing calculation dependencies for determining the influence of inherited defects formed from previous operations on the crack resistance of the surface layer during grinding. The technological conditions of machining are investigated, taking into account the accumulated damage and inhomogeneities of magnetically hard materials, especially those prone to cracking during grinding, which is of great economic importance for reducing defects in finishing operations and improving the operational properties of machine parts. A mathematical model has been developed that describes thermomechanical processes in the surface layer during grinding of magnetically hard alloy parts, taking into account their heterogeneities that affect the formation of grinding cracks. At the same time, for the first time, the calculated dependencies between the criterion of crack resistance and the main controlling technological parameters were obtained. Based on the known characteristics of hereditary defects, the limit values of the heat flux that ensure the required quality of the ground surfaces were determined. The obtained theoretical and experimental functional relationships of the thermomechanical state of the machined surfaces of magnetically hard alloy products with technological parameters were used to build a control for selecting technological conditions that ensure the required quality of the surface layer of parts during their grinding, taking into account the maximum processing performance.