Calculation and investigation of the stress-strain state of a nitrided gear wheel

Abstract

The article presents an analysis of the stress-strain state of the nitrided gear design using the SolidWorks Simulation and APM WinMachine (FEM) programs. Models, methods and examples of calculations are given. As a result of nitriding, the surface hardness of the product increases, the safety factor increases. The experiment proved that the optimal temperature for the formation of a nitrided layer with a hardness of 11,740– 12,003 MPa for corrosion-resistant heat-resistant steel grade 12Kh18N9T was 570–590°C with a nitriding time of 48 hours. It is shown that after nitriding, the steel under study has a homogeneous structure with clearly defined transition layers, the average thickness of the nitrided layer is 60–90 microns. The stress-strain state of the product before and after nitriding, which determines the internal stresses and deformation of the wheel tooth, shows that the static characteristics are approximately equal. However, a wheel hardened by nitriding has a higher hardness, a greater safety margin and it is less prone to deformation under high loads