Особливості розрахунку використаного ресурсу пластичності при холодному формуванні внутрішніх шліцьових поверхонь в глухих отворах

Abstract

Process of forming internal spline surfaces in blind holes by the cold plastic deformation method is investigated. Based on the analysis of stress-strain state, the used resource of plasticity is estimated and areas are closest to destruction are defined: near the central part of the tooth space of spline surface and near the tooth of spline surface. The calculation of the used resource of plasticity at cold forming internal spline surfaces in blind holes is refined in this work. At calculation of the used resource of plasticity takes into account influence of volumetric scheme of the stress state. The used resource of plasticity is estimated taking into account indicators of the stress state, which includes three stress tensor invariants and stress deviator. It is shown, that accounting for the third invariant of the stress tensor at assessment of the used resource of plasticity leads to a lowering limiting to fracture deformation, and accordingly to the increasing of the used resource of plasticity. The obtained results can be applied to evaluate the limiting deformation in such processes, involving a volumetric scheme of the stress state.