A Study on the Functional Properties of a Honed Surface

Santochi, Marco; Vignale, M.; Giusti, Francesca

doi:10.1016/s0007-8506(07)63342-3

Cited by 68 publications

(23 citation statements)

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“…This approach is called plateau honing. Santochi and Vignale [4] found that plateau honing significantly shortened the costly running-in period because the surface achieved resembles a running-in surface. The plateau-honed cylinder surface ensures simultaneously the sliding properties of a smooth surface and a great ability to maintain oil on a porous surface.…”

Section: Cylinder Liner Surface Shaping Technologiesmentioning

confidence: 99%

“…The importance of the honing process in finishing cylinder liners in order to promote satisfactory engine parameters and avoid scuffing is now well recognized, but not entirely understood [2]. For example, it is commonly known that increasing the oil retention capacity by deepening the valleys in the cylinder liner plateau profile results in a decrease of mechanical losses [4,[6][7][8][9]. The underlying mechanism of this reduction in mechanical losses at smaller roughness heights can be explained on a modified Stribeck curve [10] as being due to blow-by and cavitation phenomena [11].…”

Section: Cylinder Liner Surface Shaping Technologiesmentioning

confidence: 99%

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Effect of Initial Cylinder Liner Honing Surface Roughness on Aircraft Piston Engine Performances

Woś

Michalski

2011

Tribol Lett

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Reciprocating piston engines are the major propulsion devices for light aircrafts, helicopters, and essentially all automotive vehicles. They are expected to fulfil both present-day and future demands for engine performance, durability, fuel economy, and exhaust emissions legislation. One of the key factors related to these demands is the need to the limit thermomechanical internal losses, wear, and lubricating oil consumption, which are in turn conditioned by the tribological behavior of the piston-cylinder assembly. Consequently, this latter system requires a multi-directional approach in terms of manufacturing. Apart from various modifying techniques (e.g. laser texturing), a conventional plateau-honing operation is still the standard technology for shaping cylinder liner surface microstructure. This paper describes the distinctions between variations in the performance of the engines in relation to cylinder liner roughness parameters due to different honing settings. Five air-cooled reciprocating aircraft engines (FRANKLIN 4A-235-B31) served as the objects of research. The engines passed durability tests on the dynamometer bed, including operation under artificially intensified wear conditions. The results show a significant impact of the brand-new honed cylinder liner surface microstructure on the engine output parameters. Detailed study proves that some of the cylinder liner roughness parameters, specifically, the slope of the root mean square line (RMS) for valley roughness Rvq and the linear triangle area for valleys A2, are strongly correlated with the engine operational properties. Higher values of Rvq and A2 are associated with an improvement in engine performance but result in a deterioration in the exhaust harmful emission.Keywords Gasoline internal combustion engine Á Engine performance Á Plateau honing Á Piston-cylinder assembly Á Cylinder liner Á Surface roughness Á Abrasive wear Á Tribological behavior Abbreviations A2Roughness profile parameter-linear triangle area for valleys (lm) CO Concentration of carbon monoxide in exhaust (%) HC Concentration of hydrocarbons in exhaust (ppm) ge Brake-specific fuel consumption (BSFC; g/kW h) Ne Engine output power (kW) Mo Engine output torque (N m) go Engine total efficiency (%) P-C Piston-cylinder Rq Roughness profile parameter-root mean square of heights (lm) Rvq Roughness profile parameter-slope of a linear regression of valley region (lm)

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Section: Cylinder Liner Surface Shaping Technologiesmentioning

confidence: 99%

Section: Cylinder Liner Surface Shaping Technologiesmentioning

confidence: 99%

Effect of Initial Cylinder Liner Honing Surface Roughness on Aircraft Piston Engine Performances

Woś

Michalski

2011

Tribol Lett

View full text Add to dashboard Cite

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“…Plateau-honed cylinder surface ensures simultaneously the sliding properties of smooth surface and a great ability to maintain oil on a porous surface. Santochi and Vignale [10] found that plateau honing significantly reduced the costly running-in period because the surface achieved resembles a running-in surface. However, Jeng [11] found that plateaued surfaces were characterised by shorter running-in period and smaller seizure resistance in comparison to Gaussian surfaces of the same height standard deviation.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Oil Pockets Shape and Distribution on Seizure Resistance in Lubricated Sliding

et al. 2009

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The results of experimental investigations on the effect of the oil pockets existence on seizure resistance of sliding elements are presented. Seizure tests were conducted with block-on-ring apparatus at increasing pressure. The stationary block (counter specimen) contacted the rotating steel ring (specimen). The tested assemblies were lubricated by oil L-AN 46, which was heated to 30°C before each experiment. The sliding was unidirectional. The block was a part of a bearing sleeve-hardened EN-GJS 400-15 cast iron with a hardness value of 50 HRC. The ring samples, 35 mm in diameter, were made from hardened 42CrMo4 steel of hardness 32 HRC. The friction force and temperature near the contact zone were measured during the tests. Some variants of specimen surfaces were created by burnishing technique. They were characterised by the oil pocket density, the holes depth, length, and width. The oil pockets existence of area density of 10% on the ring surface improved seizure resistance of the sliding pair steel-cast iron for speed of 0.27 m/s. The pit shape and orientation are very important, too.

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“…Plateau-honing consists in a two-steps process in which a coarser premachining operation is followed by a finishing process removing the peaks that would be typically worn out during the run-in period. The resulting surface has a plateau area capable of carrying loads and deeper, crossed valleys able to store and provide extra lubrication [5][6][7][8]. Numerous shapes, sizes and distributions of the lubricant reservoirs have been under the attention of researchers all over the world [9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Testing of Newly Developed Functional Surfaces Under Pure Sliding Conditions

Godi

Mohaghegh

Grønbæk³

et al. 2013

Tribol Lett

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The employment of surface texturing for improved tribological contacts has spread over the years. The possibilities of designing and manufacturing textured surfaces with predetermined geometries have multiplied as well as the need of performing experimental laboratory tests before applying the surfaces in an industrial context. In this paper a number of experimental tests were performed using a novel test rig, called Axial Sliding Test, simulating the contact of surfaces under pure sliding conditions. The aim of the experiments is to evaluate the frictional behavior of a new typology of textured surfaces, the so-called multifunctional surfaces characterized by a plateau area able to bear loads and a deterministic pattern of lubricant pockets. Six surface typologies, namely three multifunctional and three machined using classical processes were chosen to slide against a mirror-polished counterpart. A number of experiments were carried out at different normal pressures employing for all specimens the same reciprocating movement and the same lubrication. The measured friction forces were plotted against the incremental normal pressure and the friction coefficients were calculated. The results comparison showed clearly how employing multifunctional surfaces can reduce friction forces up to 50% at high normal loads compared to regularly ground or turned surfaces. Friction coefficients approximately equal to 0.12 were found for classically machined surfaces, whereas the values were 0.06 for multifunctional ones. All the specimens were characterized before and after testing. Wear occurrence was not detected on the tested surfaces except on the mirror-polished one which underwent all the experiments.

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A Study on the Functional Properties of a Honed Surface

Cited by 68 publications

References 0 publications

Effect of Initial Cylinder Liner Honing Surface Roughness on Aircraft Piston Engine Performances

Effect of Initial Cylinder Liner Honing Surface Roughness on Aircraft Piston Engine Performances

The Effect of Oil Pockets Shape and Distribution on Seizure Resistance in Lubricated Sliding

Testing of Newly Developed Functional Surfaces Under Pure Sliding Conditions

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