Increase of wear resistance of crankshafts of timber transport machines

Abstract

The paper considers the technological process of restoration of crankshaft necks by plasma spraying with wear-resistant thermoreacting powder PG-NA80. Wear of the crankshaft necks during operation requires repair, restoration or replacement of this part. As a result of the literature analysis, plasma spraying was found to be the most optimal and relatively inexpensive method of crankshaft recovery. The purpose of our work is to investigate the wear resistance properties of the sprayed coating and the search for op-optimal parameters of its application process. The sprayed coatings were studied according to two parameters: joint strength and wear resistance. For the study, experimental equipment of the plasma spraying laboratory of the department was used. As a result of the experimental study, separate regression equations of the effect of the main factors of plasma spraying on relative wear resistance were obtained. A comparison of physical, mechanical and tribotechnical characteristics showed an improvement in the properties of coatings by 8-12% obtained from thermoreacting powder in comparison with traditional PGSR-4 and PN55T45. Analysis of the obtained research results showed that this technological process can be effectively used to restore worn out crankshafts of forestry vehicles.