The article presents the results of modeling and determining the influence of the parameters of reverse surface plastic deformation on the geometric characteristics of the plastic imprint and the pressure in the contact zone of the working tool under static and reverse impact. Using the software for 3D design SOLID WORKS-2019 and computational modeling in ANSYS-19.1, a finite element model of the contact zone was built to determine the geometric characteristics of the plastic indentation and the contact pressure between the working tool and the surface of the workpiece, depending on the geometry of the working tool, reversing frequency its rotation, the initial angle of installation and the amplitude of the angle of reverse rotation of the working tool. Based on the obtained results, to increase the pressure in the contact zone of the working tool with the workpiece, which affects the degree of hardening and smoothing of microroughnesses of the workpiece surface and the formation of compressive residual stresses, it is recommended to use the following parameters and hardening modes: working roller with a diameter of 20–30 mm, with a profile radius of 2 –2.5 mm, distance between tops of working roller profile 1.5–2 mm, initial installation angle of the working roller 90о, amplitude of the reverse rotation angle of the working roller ±6 – ±8о and reverse speed of the working roller 200–240 double strokes/min.
The results of experimental studies to determine the influence of the parameters of reversible surface plastic deformation on the parameters of the surface waviness of cylindrical parts made of steel 45, are presented. The proposed method implemen-tation for finishing and hardening treatment requires the development of a device for the formation of a reversing circular motion of the working tool. On completion of experimental studies using the PyCharm computer program and Python pro-gramming language, optimal modes of simplification were determined, providing the lowest waviness height.
An approach to taut state increasing within elastic-plastic deformation zone in the process of surface plastic deformation has been viewed. The technical idea of solving the problem is based on the study of workplace tool kinematics. A new hard-ening process based on the workplace tool circular oscillation is proposed. To prove the effectiveness of the new workplace tool kinematics, finite element modeling has been, which helped to determine an elastic state in the deformation zone. It is found that the oscillate rotation of the work roll is much more efficient comparing to static sliding both in the taut state and distorted condition of the hardened layer
This paper discusses the development of a new procedure for finishing and hardening treatment by changing the kinematics of a deformation tool having a double-radius shape of the profile of the working surface, along with the determination of the stress-strain state in the site of elastic-plastic deformation and residual stresses in the hardened zone of the surface layer. The SOLIDWORKS 2018 software for 3D design and the ANSYS Work-bench 19.1 soft-ware using the finite element method were used to build a mathematical model of local loading. The temporary and residual stresses, the strain state in the loading zone, the depth of the plastic layer and the maximum value of the relative plastic deformation under various loading procedures of the working tool were determined. It was established that, at the reversible rotation of a double-radius roller, the values of temporary stresses are over 15% higher compared to those during static hardening, while the residual stresses are 5.7% higher. With the reversible rotation of the double-radius roll-er, the value of the maximum strain intensity becomes 2.11 times higher than that during static hardening. The intensity of the maximum residual stresses during the reverse rotation of the double-radius roller occurs at a depth 3 times greater than the indentation of the double-radius roller, rather than on the surface of the sample. The results of computer model-ling and numerical calculations indicate that the procedure of reversible rotation of a toroidal double-radius roller has the greatest influence on the intensity of the stress state in the deformation site, while the procedure of static hardening by a single-radius roller has the least impact. The obtained results suggest that the proposed technological process of surface plastic deformation based on the reversible rotation of the working tool will allow the radial tension to be reduced while maintaining the high quality of the surface layer of machine parts.
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