Increasing Durability of Transport Rollers for Sawmill Equipment

A test procedure has been developed that models the wear of a material at friction against timber with abrasive particles impregnated into it. The procedure considers the kind and grain structure of an abrasive, timber species, technique of impregnating timber with abrasive particles, and testing configuration, temperature, and modes. The building up of the lateral surfaces of roller thorns with electrodes UONI-13/NZH and powder wire PP-Np-30Х4G2М is a more expedient method to make them more durable. It is shown that the grade 30 steel wear is characterized by the plastic straining of micro-volumes in the surface layer in the presence of individual marks and scratches, whereas the buildup wear is attended only by elastoplastic straining. The influence of such factors, as contact pressure, sliding speed, test temperature, and quartzy particle grain structure on the wear resistance of the studied surfacings is revealed. It is noted that the wear resistance of buildups UONI-13/NJ and PP-NP-30X4G2M for various test conditions is approximately equal to and 2.5–3 times as high as that of grade 30 steel; however, the preferable option for practical use on feed rollers is UONI-13/NJ due to its enhanced anticorrosion properties.