An Ultrasonic Testing Method for Judging the Lubrication State of Rolling Bearings in Actual Working Conditions

Abstract

The invention discloses an ultrasonic detection method for judging the lubrication state of rolling bearings under actual working conditions. The method uses a high-frequency focusing probe (or a miniature high-frequency straight probe) on the outer ring of the bearing to obtain the contact between the roller and the ferrule. Based on the comprehensive extraction and discrimination of the reflected wave amplitude and phase information, the lubrication status of the bearing can be determined. The detection of the lubrication state of rolling bearings under actual working conditions is the most direct method to judge the running state of bearings, and it is a very critical basic detection method in the field of bearing contact lubrication research. Therefore, the present invention can detect the lubrication state of the rolling bearing under real working conditions, and then judge the lubrication state between the bearing roller and the ring (dry friction, mixed lubrication or elastohydrodynamic full-film lubrication).

Description

technical field [0001] The invention belongs to the technical field of operating state detection of rolling bearings under actual working conditions, and in particular relates to an ultrasonic detection method for judging the lubrication state of rolling bearings under actual working conditions. Background technique [0002] Rolling bearings are widely used in various large rotating mechanical equipment, such as aero-engines, gas turbines, transmissions, machine tools, etc. Its running performance and stability are closely related to the contact lubrication state between inner and outer rings and rollers. When the bearing works under lubricating oil lubrication conditions, a lubricating oil film will be formed between the roller and the raceway. Due to the existence of surface roughness, high temperature, low speed, heavy load, chemical reaction, rheological characteristics and other factors in engineering practice, the rolling The full-film lubrication state between the be...

AI Technical Summary

Problems solved by technology

When the bearing works under lubricating oil lubrication conditions, a lubricating oil film will be formed between the roller and the raceway. Due to the existence of surface roughness, high temperature, low speed, heavy load, chemical reaction, rheological characteristics and other factors in engineering practice, the rolling The full-film lubrication state between the bearing and the raceway fails or is difficult to form, and becomes a mixed lubrication state where fluid lubrication and rough peak contact coexist. The continuous operation of the bearing in the state of insufficient lubrication will significantly reduce the service life and safety. Therefore, the bearing Lubrication state detection has always been the core issue in the field of bearing detection technology

However, due to the limitations of actual working conditions and technical level, a large number of test and detection methods cannot be really applied to the detection of the lubrication state of rolling bearings, resulting in the serious lack of verification and verification of measured data in the existing theoretical development, and it is difficult to truly guide practical applications. , which is one of the key issues to be solved urgently in the development of my country's bearing industry

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