Abstract
An improved method of passive thermal control has been proposed in order to operatively assess the technical condition of rolling bearings, based on studying the heating rate of a bearing. The values of the heating rate of ball, roller, and conical rolling bearings, as well as ball separators, have been determined empirically. It has been shown that the discrete limit heating rate values derived under the regular heating mode of mechanical reducers during stand tests are suitable for use as a diagnostic criterion for rolling bearings. Based on the heating speed criterion for mechanical reducers, it is possible to perform an operative assessment of the technical condition of rolling bearings of different types during the operation of equipment for different purposes. It has been established that for a rolling bearing in a working technical condition the heating rate under a regular heating mode does not exceed 1 °C/min. The resulting value corresponds to the diagnostic criterion for the heating rate of mechanical reducers in a working technical condition of ϑ н ≤1.1 °C/min. Using a diagnostic parameter of the heating rate under a regular heating mode makes it possible to resolve the issue related to the duration of control over the technical condition of a rolling bearing using a thermal method. Reducing the control procedure duration, when using the improved thermal non-destructive testing, by 4 times, would yield a reduction in operating costs due to the possibility of ongoing control over rolling bearings at the beginning of the equipment operation. It has also been confirmed that the heating rate of rolling bearings under a regular heating mode directly depends on their technical condition and does not depend on the load transferred and the mode of operation of the bearing nodes of the technological equipment. The proposed method could be applied in the maintenance system based on the actual condition of the equipment for the operative control over rolling bearings
Highlights
The most common mechanical assembly of industrial equipment is the bearing node
Our study has shown that under equal lubrication conditions, the thermal control results are most affected by the transmitted load and the type of a bearing
The results of control based on the heating rate under a regular heating mode are mainly influenced by the technical condition of the rolling bearing
Summary
The most common mechanical assembly of industrial equipment is the bearing node. The technical condition of the bearing node is mainly determined by the technical condition of the rolling bearings. Finding the optimal method of diagnosing and monitoring the technical condition of industrial equipment is directly related to the safety of production. Today we know many different types of the non-destructive testing of the technical condition of an object: acoustic; vibroacoustic; eddy current; magnetic; optical; using penetrating substances; radiation; radio wave; thermal; electric [2]. To detect mechanical nodes’ failures, the most common and most popular method of non-destructive testing is the passive method of thermal control. The passive method of thermal control is based on the theory of thermal conductivity under the thermal stabilization mode, which requires a long time to get the object of control into control mode and is associated with energy costs This feature of the passive method of thermal nondestructive testing does not make it possible to quickly assess the technical condition of an object. It is a relevant task to improve the thermal method for the non-destructive testing of machines and mechanisms, which requires further experimental research
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