STUDY OF THE TECHNIQUE PERFORMANCE FOR THE CORRECTION OF THE MODE OF THE MACHINING PROCESS WITH TIME-VARYING PARAMETERS IN THE CONDITIONS OF TECHNOLOGICAL INFORMATION UNCERTAINTY

A technique for correcting a machining mode with time-varying parameters has been developed. The technique allows minimizing the impact of the uncertainty of technological information caused by the incorrectness of mathematical dependencies and models used for calculating the parameters of the process or due to the lack of initial data for the selection of parameters of mathematical models. It provides for the corrective dependencies and models according to the current information with respect to the output parameters. The correction of the mode elements is performed according to the results of comparing the calculated and actual values of the output and current process parameters. The calculated functions of changing the output parameters over time are determined. The routine for determining the interrelated current and output parameters of the processing process allows calculating their values depending on the operating time of the tool. According to the results of comparing the calculated values of the process parameters with the values that should be obtained at a time equal to the efficient tool life, the correction of the mode elements is performed. If the calculated values of the output parameters do not exceed their limit values, then the operation mode should be intensified for the sake of increasing productivity. The intervals of variation by controlled factors are determined, which allow changing the output parameters at a time equal to the efficient tool life by the desired value. When calculating the intervals of variation by controlled factors at the first stages of mode adjustment, they are guided by the initial models and dependencies describing the process. The necessary result may not be achieved due to the uncertainty of the information, including the incorrectness of the models. Therefore, if necessary, the subsequent stages of mode adjustment are put into operation. Based on the actual values of the output parameters, the process models are adjusted, and the variation intervals by controlled parameters are calculated using adjusted models. The application of the developed method of mode correction makes it possible to increase the turning performance by 30…35 % while ensuring the required quality of the machined parts within a given period of tool durability.