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Article

Andrzej Kaźmierczak

The ring seal under consideration has come out as a result of the complex research such as the numerical simulation research, introductory quality research involving a…

Abstract

The ring seal under consideration has come out as a result of the complex research such as the numerical simulation research, introductory quality research involving a real object, comparative research on a tribotester and fundamental research on the real object. It has been found that the essence of excellent tribological properties of the new ring seal lies, in its low value of surface free energy (SFE) of titanium nitride coating on the piston ring and in its high value of energy which is the characteristic of the nitrided surface of the cast iron cylinder sleeve. As a result, when the motion of the ring on the sleeve surface ceases, especially in the outer dead centre (ODC) in expansion stroke, the boundary layer of oil on the sleeve surface prevents metallic contact. In general, it has been found that the SFE can be an important index of material selection for cutting pairs, especially for those working in the reciprocating motion.

Details

Industrial Lubrication and Tribology, vol. 56 no. 1
Type: Research Article
ISSN: 0036-8792

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Article

Andrzej Kaźmierczak

Ferric and ferrous oxides are used for coating of piston rings in order to obtain the layer, facilitating their wearing‐in at the beginning of work. This paper aims to…

Abstract

Purpose

Ferric and ferrous oxides are used for coating of piston rings in order to obtain the layer, facilitating their wearing‐in at the beginning of work. This paper aims to present study and the implementation of the anti‐wear technology of piston rings production with the application of ferrous oxides. Those rings are intended for two‐stroke self‐ignited diesel engines used for driving the diesel locomotives.

Design/methodology/approach

It was decided to use magnetite, Fe3O4, together with a binding agent, sodium metasilicate. Working out the adequate technology of filling the grooves of piston rings required performing a broad research range. It is possible to apply three different technologies. In order to find out which of the three methods of filling grooves gives the best results, the series of experiments were planned.

Findings

Experimental results cover the variability intervals of input factors enabling the selection of their best combination by the analysis of the regression function. The paper describes the experimental plan for the wet technology with water‐glass, since it occurred to be the best considering the equipment of the factory in which it was implemented. In order to cover the variability field of input factors, the multifactor Hartley's plan was applied. On the basis of the performed investigations, it was found that all input factors are significantly influencing the filling quality of ring grooves on piston rings.

Practical implications

This technology in one of the Polish factories in piston rings production was implemented. The implemented technology allows the production of approximately 500,000 rings annually.

Originality/value

The paper presented a new anti‐wear technology of the sealing piston rings for diesel.

Details

Industrial Lubrication and Tribology, vol. 58 no. 3
Type: Research Article
ISSN: 0036-8792

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Article

Andrzej Kaźmierczak

A computer simulation which as model loads uses program KIVA 3 for combustion engine work process (combustion chamber heat flux, pressure and temperature) computations has…

Abstract

A computer simulation which as model loads uses program KIVA 3 for combustion engine work process (combustion chamber heat flux, pressure and temperature) computations has been developed. It makes it possible to compute the pressure and temperature distributions and the motion of the charge in the combustion chamber at a particular point in the work cycle. Computer models of the ring seal components were constructed using computer code Parasolid v. 11. The models render to the finest detail the design‐material features of the ring seal components. The Nastran program was used to perform FEM computations for a selected point of engine work (at a crank angle of 10°) at which the maximum averaged temperatures and pressures were found to occur in the combustion chamber. Finally, 3D temperature and pressure distributions for the whole ring seal were obtained. On their basis, inferences can be made about the design‐technological nature of the seal under development.

Details

Industrial Lubrication and Tribology, vol. 56 no. 4
Type: Research Article
ISSN: 0036-8792

Keywords

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