DETERMINATION AND ACCOUNTING OF THE VALUE OF MUTUAL COMPENSATION OF ERRORS IN PREDICTING THE ACCURACY OF PROCESSING ON MACHINES WITH CNC
Abstract
Based on the results of experimental studies, the values and coefficients of mutual compensation of errors in technological dimensions are determined. Their use makes it possible to formalize the consideration of the influence of the mutual compensation of errors in the dimensional analysis and to increase the efficiency of the predictive assessment of the accuracy of the master links – design dimensions due to a significant, more than 2 times, reduction in the predictive values of the scattering fields and their approximation to real values, as a result of which the technological processes assessment quality will be increased at the stage of their design. An example of the use of obtained results in the calculation of operational dimension chains for the predictive assessment of design dimension accuracy is shown. It has proved the importance and efficiency of taking into account the mutual compensation of technological dimension errors to improve the assessment quality and make more informed decisions about the acceptability of technological process or the need for its adjustment. While calculating the magnitudes of scattering fields of closing links by any of the methods (max-min, probabilistic), failure to take into account the mutual compensation of errors of technological dimensions leads to a significant, more than 2.3 times, overestimation of the predicted values of scattering fields of closing links relative to the actual ones. The consequence of which may be the erroneous introduction of additional processing, which in reality would be unnecessary. The use of obtained results in practice allows to improve the predictive accuracy assessment quality and can be the basis for the further creation of algorithms for the detection of such links and automation of corresponding calculations. Formalization of calculations and taking into account the mutual compensation of errors of technological dimensions, together with similar solutions for other procedures, open the way to further automation of dimensional modeling and analysis of technological processes.
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