THE DEVELOPMENT AND RESEARCH OF METHODOLOGY OF CORRECTION OF MECHANICAL TREATMENT MODE IN THE CONDITIONS OF UNCERTAINTY OF TECHNOLOGICAL INFORMATION

The promising direction to apply the mode of mechanical treatment is its calculation using the models linking the input and output parameters of the process. However, the models are obtained using the numerous assumptions; they do not consider the influence of a number of factors acting in the treatment process and do not provide high accuracy of calculated values. Therefore, the necessity arises to correct the mode defined with the use of such models. For this purpose, the authors propose the methodology involving the adjustment (correction) of the process models according to the current information about the output parameters and the variation of controllable factors under the plan, the implementation of which allows bringing these factors to the optimal level. The authors give the dependence for the calculation of the controllable factors variability interval. As an argument, this dependence contains partial derivatives displaying the degree of influence of the elements of mechanical treatment modes on the process output parameters. At the first stage of the mode correction, these derivatives are obtained using the models displaying the relationship between the process output and input parameters; at the next stages, data on actual values of output parameters obtained in the result of their measurement are used. The authors give the recommendations on the selection of the plan of the variability of the mode elements depending on the ratios of the limiting and actual values of output parameters. To test the methodology, the authors developed a software that takes into account two output parameters: the accuracy of diameter dimension and the mean absolute error of the treated surface profile; and two controllable parameters: cutting velocity and feed. The study of the effectiveness of the developed methodology was carried out during the turning processing of the workpiece outer cylindrical surface using the cutter with a plate made of T15K6 alloy. The application of the developed technique and software allows adjusting the pre-calculated processing mode, due to that, the performance of turning process when providing the quality of treated parts increases.