Method for evaluating risk of contact fatigue failure of surface hardened gear

Abstract

The invention discloses a method for evaluating the risk of a contact fatigue failure of a surface hardened gear. The method includes the first step of calculating contact parameters of a meshing position according to the geometry kinematics of a gear pair, and establishing a contact analysis model; the second step of performing contact stress and strain analysis based on the gear pair contact analysis model, and obtaining an equivalent shear stress of a complex multiaxial stress field; the third step of estimating the local material strength of the gear according to a hardness curve of the gear material and material parameters; the fourth step of converting residual stress into an equivalent shear stress according to a residual stress curve of the gear material; and the fifth step of dividing the equivalent shear stress by the local material strength of the gear, to obtain an exposure value of any point of a key contact area. The method for evaluating the risk of the contact fatigue failure of the surface hardened gear has the advantages that the long-standing technical problems in the machinery industry are solved, the risk of the contact fatigue failure of the gear can be effectively estimated, and the basis is provided for the design, manufacture, and use of gears.

Description

technical field [0001] The invention belongs to a method for evaluating the risk of fatigue failure of mechanical parts, in particular to a method for evaluating the risk of contact fatigue failure of a surface-hardened gear pair represented by carburizing and quenching. Background technique [0002] Modern industry is constantly developing in the direction of high speed, heavy load and high power, so industrial production has higher requirements for power density and service life of important parts such as gears and bearings. However, the contact fatigue failure of gears significantly affects the reliability and service life of mechanical equipment such as fans, helicopters, and ships, and greatly affects human-machine safety and economic benefits. Due to the complex contact conditions of gears, and the influence of factors such as tooth surface hardening layer gradient and residual stress gradient, the contact fatigue analysis of gears is more difficult. Effectively assess...

AI Technical Summary

Problems solved by technology

However, the contact fatigue failure of gears significantly affects the reliability and service life of mechanical equipment such as fans, helicopters, and ships, and greatly affects human-machine safety and economic benefits.

Due to the complex contact conditions of gears, and the influence of factors such as tooth surface hardening layer gradient and residual stress gradient, the contact fatigue analysis of gears is more difficult. Effective assessment of gear contact fatigue failure risk has always been a technical problem in the machinery industry.

Images