Working tool kinematics influence on the machine parts quality at the plastic deformation

Research was carried out to determine the working tool kinematics influence during the surface plastic deformation on the machine parts quality. It was established that, a toroidal roller with the reverse circular motion had advantages at the surface plastic deformation and hardening in comparison with a toroidal roller rotating relative to the central axis and with a roller performing a circular rotation relative to the central axis passing through the plane that connected the single-radius elements. Those included decrease in the surface roughness parameters of the Ra hardened part by 77.3 and 33.3% and Rz - by 33.7 and 14.5%; grain size reduction by 89.0 and 83.3%; increase in the surface layer micro-hardness by 40.4 and 25.5%; increase in the hardening depth by 18.2 and 6.1%; increase in the maximum compressive residual stresses in the surface layer by 34.4 and 15.5%; increase in the dislocation density by 11.4 and 3.2 times, respectively.
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