Abstract
The roller bearing is a component which helps to reduce friction on relative rotational or sliding movements of the machine parts. Nowadays, there are many kinds of rolling bearings whose production is constantly improving due to increasing demands on the mechanical properties and durability. An important and necessary step in the production of rolling bearings is the heat treatment. Technological heating process must be created rationally for the required mechanical properties such as hardness, toughness and also dimensional accuracy all with respect to the economic efficiency. Because of the economical demands, simulation software is increasingly beginning to be used in the projection of heat treatment. This simulation software can predict metallurgical and mechanical properties of components after heat treatment, and thus it is easier to select the optimal material design, heat treatment process and it can possibly identify construction deficiencies in the selected part. For simulation of the heat treatment the SWYSWELD software from ESI group was used. As the output value after the simulated heat treatment (quenching) was hardness, composition of microstructure, roundness and residual stresses. These results of the simulation were then compared with the real measured values [1, 2 and 3].
Highlights
Material characteristic and diameters of the bearing ringsAs an experimental model the outer bearing ring (Fig. 1) was chosen
SIMULATION OF ROUNDNESS, HARDNESS AND MICROSTRUCTURE OF BEARING RINGS WITH THIN CROSS SECTIONS BY USING SYSWELD
The SYSWELD software is designed to simulate and evaluate different methods of welding and heat treatment which works on the finite element method (FEM)
Summary
As an experimental model the outer bearing ring (Fig. 1) was chosen. This modified steel has increased hardenability compared to the basic steel 100Cr6 which is used for producing thin wall bearing rings and glands. The 100CrMnSi6-4 steel is used for production of bearing rings of a diameter exceeding 30 mm, bearing balls, tapered rollers, barrels with diameters up to 35 mm and rings with wall thickness up to 45 mm. Usual tempering temperatures are from 150 to 180 ° C. Manufactured rings prescribed hardness after quenching min. 64 HRC hardness and after tempering 59+4 HRC. Maximum allowable roundness after quenching is 0.2 mm recommended by the manufacturer [4 and 5]
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