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UDC 004.94:006.78

SELECTION OF STANDARD FITS WITH RANDOM NATURE OF SIZES OF HOLES AND SHAFTS FOR CAD/CAM SYSTEMS

S. V. Skvortsov, PhD (technical sciences), full professor, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.
T. S. Skvortsova, PhD (technical sciences), teacher, Academy of Law Management of Russia; This email address is being protected from spambots. You need JavaScript enabled to view it.
V. I. Khryukin, PhD (technical sciences), associate professor, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.

The task of calculation of tolerance and deviation limits for holes and shafts according to the given limiting sizes of clearance or interference fit is considered. The aim of this work is the development of technique for selecting standard fits that meet specified accuracy requirements with random nature of sizes of holes and shafts. This technique is based on stochastic simulation and takes into account technological features of production. The distribution laws of hole or shaft tolerance intervals can be any and size limits of these tolerances are absent. A method to choose standard fits based on stochastic simulation of mating details sizes have been developed. The conditions of complex application of the method developed in the combination with known methods taking into consideration technological conditions of an enterprise are defined.

Key words: CAD/CAM systems, stochastic simulation, holes and shafts, clearances and interferences, tolerances and fits, tolerance intervals, standard fits, recommended and preferable fits.

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