FEATURES OF DIAGNOSING ROLLING BEARINGS BY THE ENVELOPE METHOD

Abstract

The article is devoted to the work on identifying defects of the surface crack type by the vibrodiagnostic method of non-destructive testing using the envelope method on the example of a rolling bearing. Used in the work rolling bearings with a set of various surface defects: a roller crack and an outer ring crack along the rolling surfaces. The rolling bearing was installed in a test bench, which simulated its regular operation, with a fixed outer ring and internal ring rotated at a constant frequency. The features of the detection of the following specific defects are established: a roller crack, a crack in the outer ring, etc., as well as the correspondence of the calculated frequencies of the bearing elements to the actual ones obtained during the research. The norm/rejection criteria were obtained in a numerical value in relation to specific types of defects, namely: weak, strong defects of the rolling elements and the outer ring of the rolling bearing. The features of detecting specific defects by the envelope method, that depends on the pressure on the outer ring and its spatial location relative to the defect, are experimentally established.