| Popis: |
Perspective of polymeric materials, including anaerobic adhesives, usage during reconditioning and ensuring the further operability of the machine’s components junctions that were damaged under operating conditions are shown. The adhesive material can remain in its original state for a long time without changing its properties and quickly harden with the formation of a strong polymer layer in narrow gaps between the surfaces of parts at temperatures of 15–35°C without contact with atmospheric oxygen. The main advantages of anaerobic adhesives are a high cure rate (fixing time is about 15-30 minutes); high viscosity (gaps up to 3 mm could be sealed); stability of properties during long-term operation under sharp temperature drop and increased vibration conditions; high strength characteristics (impact shear strength - 8-20 kJ/m2; shear strength - 20-30 MPa). To make a reasonable choice of anaerobic adhesive brand and type for restoring the performance of various machines parts junctions the following anaerobic compounds were analyzed: AN-1U (Russia), Ug- 7 (Russia), Anaterm-6k (Russia), Anaterm-111 (Russia), Permatex® Bearing Mount for Close Fits (USA), Permatex® Bearing mount for Worn (USA). The article provides comparative technological characteristics of the studied compounds. It was established that while choosing the brand and type of anaerobic materials, it is necessary to consider the loading mode of the restored element, temperature conditions, the gap between mating surfaces, the quality of surface cleaning, the nature of the coating and the viscosity of the adhesive material. Based on the investigations the standardized technologies for machine’s components junctions working ability restoration using anaerobic materials, depending on the sealing gap in the joint, as well as technologies recommended for repair of sealing cracks in frame body parts are proposed. Anaerobic adhesives are recommended for use in technical service enterprises and workshops of the agricultural sector. Using the anaerobic adhesives allows in most cases to replace welding, surfacing, soldering operations in the reconditioning process but also in some case to restore the units and assemblies which repair is impossible or difficult by traditional methods. The studies were carried out under the grants of the Russian Foundation for Basic Research 18-29-18081. |
