Calculation method for elastoplastic deformation of a line contact rolling bearing

Abstract

The invention relates to a calculation method for elastoplastic deformation of a line contact rolling bearing, and belongs to the technical field of rolling bearings. The method uses the trial solution of control error to solve the normal load of the rollers of the line contact rolling bearing. The surface normal contact stress is calculated by the conjugate gradient method and FFT. The surface elastic deformation and subsurface stress are calculated by the influence coefficient method and FFT. The plastic deformation zone is judged according to the von Mises yield criterion. The plastic strain increment is solved by Newton-Raphson algorithm. After the plastic strain converges, the residual deformation of the surface is calculated. The sum of the elastic deformation and the residual deformation constitutes the elastoplastic deformation of the loaded roller of the line contact rolling bearing. The method can accurately and quickly obtain the elastic deformation of the roller in the calculation area, considering the influence of the machining precision, which provides theoretical guidance for the use of line contact rolling bearings in engineering practice.

Description

technical field [0001] The invention belongs to the technical field of rolling bearings and relates to a method for calculating elastic-plastic deformation of line contact rolling bearings. Background technique [0002] Linear contact rolling bearings (cylindrical roller bearings and needle roller bearings) are widely used in construction machinery, wind power generation, rail transit, aerospace and other fields. They rely on rolling contact between components to support rotating parts, and are important in modern machines. Power transmission components. The bearing steel material has a strain limit under the action of external load. If this limit is exceeded, the bearing cannot completely restore its original size after the load is removed, and indentations may be left on the raceway, and long stretches may appear on the rollers. Streaks. Usually, this permanent deformation is so small that it will not cause fracture failure of the bearing under normal operating load. Ex...

AI Technical Summary

Problems solved by technology

However, if the amount of permanent deformation is large, pits will be formed on the raceway, causing vibration of the bearing and increased friction

When the indentation occurs simultaneously with the boundary lubrication state, it may lead to fatigue failure of the bearing surface first

[0003] The traditional bearing design methods are all aimed at smooth bearings, which cannot be used to analyze the influence of machining accuracy on the elastic-plastic deformation (that is, the amount of permanent deformation) of bearing parts, and cannot accurately calculate the 0.0001D of the bearing under the radial load that may cause the bearing Elastic-plastic deformation of running instability, that is, inability to accurately guide the application of radial loads in line contact rolling bearings

Therefore, the traditional calculation method of elastoplastic deformation of line contact rolling bearings has more statistical and empirical significance, and its consideration factors are not comprehensive enough, and the calculation accuracy is not accurate enough.

Images