TRANSITION FROM THE PLASTIC MODE OF DIAMOND GRINDING OF CERAMICS TO MELTING AND FEATURES OF THE MELTING OF INSTRUMENTAL CERAMICS

Abstract

It is shown that the traditional method of estimating the specific energy capacity based on the ratio of grinding power to processing productivity does not provide an adequate solution, since with it the specific heat capacity of processing exceeds the specific heat capacity of melting ceramics by almost an order of magnitude, and therefore, any diamond processing of ceramics should immediately enter the plasticity regime, which is not really the case. Therefore, it is the application of a new approach to the assessment of the specific energy intensity of diamond grinding, taking into account the wear of the working layer of the diamond wheel, that makes it possible to assess the possibility of achieving the energy conditions for the transition of ceramic processing to the plastic mode.
 It is shown that the plastic mode occurs precisely when the specific energy capacity of grinding becomes close to the specific heat capacity of melting ceramics.
 It was found that similar to the processes during the thermal melting of ceramics, melting crusts are also formed in the discharge hole during electroerosion grinding. Quantitative analysis of melting products shows that a structure close to the fracture of the sample is formed in the discharge holes after melting, in which there is no oxygen.