Applied Mechanics and Materials Vol. 630

Abstract: The purpose of the pumps safety and failure mechanism used in processing industry is the loss limitation using mechanical face seals. Studying the notified damages analysis, the conclusion shows that in a high percent these were induced by vibrations. The vibration monitoring, as part of a proactive and predictive maintenance program, becomes necessary to reduce the environment pollution and the mechanical face seals damages. Due to the fact that the analyzed system is made of centrifugal pump, coupling, bearings and electric motor, we will use vibrations in the diagnose process.

Abstract: Thus a new method of shaft necks processing is suggested for practical application, including application of soft antifriction metal coating, chosen from group: indium, tin, copper, silver, which differs that the coating is applied by electroerosion alloying on the shaft neck surface with discharge energy 0,01-0,03 J in the final operation, or the coating of copper or silver is applied with discharge energy 0,04-0,4 J and subject to post-processing, for example nonabrasive ultrasonic finishing. In such cases the surface layer with the microhardness less that the microhardness of the backing is formed. That promotes the fall of friction assembly normal operation and reduces the possibility of babbit microfractures formation in cubic crystals SnSb, which subsequently become the center of fractions formation in bulk of the layer.

Abstract: The upgrading technology of rotor shaft necks in the process of their manufacture and repair was developed on the basis of the stressed-deformed state analysis, structure and properties of the surface layer, subjected to electroerosive alloying with the further surface plastic deformation.