Molchanov O. Creation of the Surface of the Articles Made of Oxide Ceramics under Diamond Grinding

Process of creation of surface layer of oxide ceramics under diamond grinding. Creation of surface roughness and unsoundness of adamant based ceramic products under diamond grinding ensuring improvement of their operational characteristics. The theoretical investigations are based on the basic rules of the theory of cutting, mechanics of brittle destruction and theory of probabilities. Kinematics of process of interaction of diamond grains with surface been machined under diamond grinding is considered in view of probable character of brittle destruction of oxide ceramics surface. The mathematical modeling of researched process is carried out with use of the package MathCAD 7.0 Professional at PC. The experimental researches are based on the theory of design and statistical processing of experimental results, apparatus of variance analysis, application of computers and are carried out in laboratory conditions with use of modern methods of research and measuring equipment (profilographing of a surface, capillary method of luminescent flaw detection, profilographing of a diamond wheel cutting surface with extraction of diamond grains etc.). For the first time the mathematical model of creation of the roughness under diamond grinding of oxide ceramics is developed in view of probable character of brittle destruction of oxide ceramics surface layer and condition of the wheel cutting relief. That allows making a forecast of parameters of roughness of ceramics surface under diamond grinding and further to make products from oxide ceramics with rational parameters of microroughness. For the first time it is established, that under diamond grinding of oxide ceramics five forms of the cross-section of the edge take place: copied, spalling, cracking, combined and nucleate. For the first time it is ascertained theoretically and experimentally that the altitude of diamond wheel grains have a greatest effect on creation of roughness of oxide ceramics surface under diamond grinding. The postulate, that with unsoundness arising under machining and not exceeding the level of structural unsoundness the strength of ceramic products is not reduced, is confirmed for oxide ceramics. Results of work are introduced at the factory "Ceramics" (Donetsk).