An Analysis of the Physical and Mechanical Principles of Crankshaft Reconstruction

Abstract—The paper presents an analysis of operating conditions, main defects and restoration technologies for internal combustion engine (ICE) crankshafts including various types of surfacing and spraying such as electric arc, gas flame, detonation, and plasma which is subdivided in turn into induction and plasma-arc processes. It is noted that reliability metrics are better met by technologies for restoring parts with hardness ratios (НRСr/НRСn) and the fatigue strength limit (G–1r/G–1n) numerically greater than one compared to new parts. At the same time, none of the restoration technologies fully satisfies this indicator because the wear resistance of new crankshafts in most cases is higher than that of restored parts. The use of antifriction, wear-resistant and solid lubricant coatings applied by various methods, including finishing antifriction non-abrasive treatment (FANT), increases the resistance to wear, corrosion, and fatigue and improves running-in of rubbing machine parts.