Metal Magnetic Memory Method
Metal Magnetic Memory Method
October 30, 2017
Second International Conference on Diagnostics of Structures and Components Using Metal Magnetic Memory Method. April 24-25, 2018, Budapest, Hungary
July 01, 2017
More than 60 testimonials of organizations on the MMM method efficiency based on the results of practical diagnostics of equipment were presented at the workshop.
June 30, 2017
Energodiagnostika Co. Ltd took an active part in the work of the Congress, Exhibition and in the meetings of the International Society for Condition Monitoring, 13-16 June 2017 in London, UK.

Determination of babbit fit tightness on split-shell bearings

The technique is based on measurement of scattering magnetic field Нр characterizing residual magnetization distribution in a bearing body. Field Нр measurement can be produced through a babbit layer of the thickness up to 20 mm.

A zone (line) with maximum residual stress concentration (SC zone) is the criteria for determination of parts with potential upset of babbit fit tightness.

The technique is expediently to use in combination with ultrasonic flaw detection. Zones of maximum stress concentration are determined primary by the specialized magnetometers (TSCM-2FP or TSC-type). Then by scanning along SC lines by an ultrasonic instrument gauge (for example thickness gauge) the zone of babbit fit tightness upset is detected.

Fig.1 shows the example of the SC lines location revealed through a babbit layer of the thickness 10 mm on the split-shell bearing.

Fig.1. The example of the SC line location on the split-shell bearing: 1 - zones of babbit fit tightness upset; 2 - SC lines.

Energodiagnostika Co. Ltd is the main developer of a principally new non-destructive testing method and inspection instruments based on application of the method of metal magnetic memory (MMM method).
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