Modeling wear process of oil scraper piston rings with pyrolytic chromium coating

Abstract

The modern designs of oil scraper piston rings of internal combustion engines, including box-section rings with an expander are considered. Pyrolytic carbide of chrome coating of the working edges of oil scraper piston rings are proposed as a possible alternative to galvanic chromium coating. The results of model tribotechnical samples tests, which showed the effectiveness of pyrolytic chromium carbide plating in comparison with galvanic coating with chromium, are presented. Under the same conditions the wear of samples with pyrolytic chromium plating is 3.5 … 4 times less. It is shown that pyrolytic carbide chromium coating is promising for piston oil scraper rings.

Increasing the wear resistance of highly loaded parts such as bodies of rotation by the method of vibration rolling

“…In friction of surfaces with conventional treatments (turning, grinding, polishing), sharp protrusions of microroughnesses can play the role of stress concentrators, while surfaces that are too smooth are prone to scoring and seizure, which can occur especially when lubrication is insufficient [19][20][21][22][23][24][25]34].…”

Improving the technology of surface preparation of titanium alloys before the processing process

“…The material nature of the plastic deformation method consists in changing the physical and mechanical properties of the material in the expected chip formation zone by preliminary hardening carried out by a special tool, which is an additional source of mechanical energy. A change in the shape and structure of the crystal lattice in the local zone of the workpiece causes a change in the rheological properties of the metal [5,[21][22][23][24].…”

Features of the manufacturing technology of a multilayer tool with an ordered texture

“…Several fundamental studies [13,[20][21][22][23][24] have been devoted to the study of metal cutting auto-oscillations in order to understand the nature of chip formation processes in turning and to evaluate the importance of ensuring the stability of the technological system in machining. Due to the analysis and classification of methods and techniques for ensuring the dynamic stability of the technological system, it can be stated that, to a greater or lesser extent, all these methods allow for increasing the stability of the technological system.…”

“…The technological system is affected by an external periodic force that causes an oscillatory process with a frequency equal to the frequency of the perturbing force, or complex periodic processes due to the nonlinear properties of the system, as a consequence of which there are natural damped and forced oscillations, parametric excited oscillations, and auto-oscillations of the system. The intensity of forced oscillations is especially high under resonance modes conditions, which are inadmissible as operating modes in finishing machining on metal cutting machines [15,[21][22][23][24][25][26].…”