Authors: S.E. Uchaikin

Title of the article: Influence of technological factors on the formation of a deformation site during the rollining of complex-profile surfaces

Year: 2024, Issue: 5, Pages: 19-29

Branch of knowledge: 2.5.6. Engineering technology

Index UDK: 621.787

DOI: 10.26730/1999-4125-2024-5-19-29

Abstract: The article presents a study of deformation center formation during rolling of complex-profile shafts used in various products in different industries. Structural elements such as keyways and splines, fillet transitions between steps, grooves, threads, etc. are stress concentrators that adversely affect the performance properties of parts. In most cases, shafts are subject to cyclic alternating loads, so reducing the influence of concentrators is an urgent task. The analysis showed that surface plastic deformation (SPD) by rolling with rollers allows to significantly increase the cyclic service life by reducing the surface roughness of the part to Ra 0.4...0.02 with obtaining hardening up to 10 mm deep with a hardening degree of up to 20...50%. It is shown that the previously established patterns of surface layer formation inherent in the processing of cylindrical surfaces do not work to the full extent when processing transition surfaces. In this case, a non-stationary deformation zone is formed during the processing, which indicates the formation of an uneven surface layer, which certainly affects the cyclic properties of the material of this product. In the author's opinion, to ensure greater cyclic durability, it is necessary to achieve a stationary deformation zone during the processing by rolling. For this purpose, studies were performed to study the influence of the rolling scheme, the geometry of the complex-profile surface and the interference fit on the formation of the stress-strain state of the metal in the deformation zone and the hardened surface layer of the part. As a result of modeling contact problems of rolling in the Ansys software product, the influence of the following on the formation of the stress-strain state was studied: two proposed rolling schemes for transition surfaces; complex-profile geometry of the surface of the part, containing and not containing sections formed by the intersection of the generating geometric elements and the variable tension of the deforming tool. The results of the studies showed the possibility of achieving a stationary / quasi-stationary deformation zone due to a combination of the analyzed technological factors.

Key words: complex-profile shafts surface plastic deformation rolling technological factors stationary / quasi-stationary deformation zone FEM modeling stress-strain state

Receiving date: 02.09.2024

Approval date: 29.09.2024

Publication date: 24.10.2024

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