TECHNOLOGY AND RESULTS OF STUDYING THE DIVERSIFICATION OF THE OPERATIVE CONDITIONS OF METAL CUTTING TOOLS

The technology and the results of its investigation contributing to studying the diversification of the operative conditions of metal cutting tools, are presented as exemplified in a tool equipped with a hard alloy plate. It is shown that the rate of diversification can be judged by the appearance of a two-dimensional histogram constructed from time series of signals indicating fluctuations in the technological system in mutually perpendicular planes. The occurrence of a "comet tail" pattern on the histogram indicates a high rate of diversification of operative conditions, in particular, during the running-in of the tool. To show the dynamics of the diversification, a cross-correlation curve is used, the form of which characterizes the strength of the relationship between the directions of oscillation. This networking proves regulation of operative conditions and the transition to a starting operation in a stationary mode. Diversification dynamics is identified using a procedure based on statistical test of the hypothesis for the significance of changes in the transformation coefficients of the spectra of diverse oscillation signals using the Student's t-test. The identification results showed that state diversification dynamics is a change in connections and constraint in the industrial process system, which leads to the formation of new dynamic properties that reduce cutting forces due to the redistribution of friction forces between the front and rear surfaces of the tool and, as a result, increase stability for disturbance resulted from the operating procedure. The approach used in the development of the process desigh is compared with approaches based on the construction of a mathematical (analytical or stochastic) model of a real system. The direction of practical implementation of the technology in the software of CNC systems is justified for more efficient solution of traditional control tasks, in particular, process tasks, which will ensure an increase in the reliability of the tool.

cutting tool, plate, condition, vibrations, two-dimensional diagram, cross-correlation, spectrum transformation coefficient, Student's test, technology