Влияние трения на распределение волокнистой структуры поковки подшипникового кольца при горячей штамповке

Abstract

The paper presents numerical simulation of the bearing rings’ hot forming process. The friction factor of the contact surfaces affects the fibrous structure in the forging-bearing ring made with the two-step molding process. The problem examined in the form of non-stationary contact thermo viscous plastic tasks and relevant boundary conditions. Its solution found with the finite element method. The pattern of the material fibrous distribution structure in the form of Lagrange lines was obtained by calculating the parameters of the stress-strain state for the pre-heated cylindrical work piece during precipitation and molding. The Lagrange lines distribution patterns for the three types of the contact surfaces friction terms compa red to: dry, lubricated friction and the combined ones. The results’ analysis allowed selecting the friction combined type as the b est option of the friction conditions to provide minimum output Lagrange lines’ angles on the contact surface during forging or rolling. The fibrous structure of the forging material makes it possible to predict the increase of reliability and durability for the finished product, i.e. bearing ring.