Observations on Cylinder-Bore Wear

Roensch, Max M.

doi:10.4271/370134

Cited by 5 publications

(2 citation statements)

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“…Cylinder wear in the progressive stage may occur by several mechanisms but mostly by abrasion and corrosion. Some abrasive wear is caused by particles left in the engine during manufacture and assembly [12]. This is correctible by proper cleaning during the various stages of manufacture [13].…”

Section: The Progressive Wear Stagementioning

confidence: 99%

The break-in stage of cylinder-ring wear: A correlation between fired engines and a laboratory simulator

Barber

Ludema

1987

Wear

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The wear of the piston ring-cylinder wall contact area in fired engines has not been satisfactorily simulated in bench testers so far. This paper reports the development of a successful test device in which the same progression of surface change occurs as in fired engines. These changes were observed by microscopy, by hardness indentations and by the use of the stylus roughness tracer. The test device uses ring and cylinder segments and it oscillates at 350 cycles mm-' over a stroke of 19 mm. It is apparently not necessary to duplicate the temperature, atmosphere, fluid film thickness and other obvious conditions in an engine to achieve simulation. At least, the materials in the engine were not affected by the conditions in the engine that were not duplicated in the laboratory tester. The purpose in developing the tester was to study the role of the honed roughness pattern found on most cylinder walls. Several engine manufacturers attempt to achieve "plateau honing". No manufacturer polishes new cylinder walls. The reason for the honed roughness is to allow a high wear rate, without catastrophic scuffing, in locations of high stress between poorly conforming parts.

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Section: The Progressive Wear Stagementioning

confidence: 99%

The break-in stage of cylinder-ring wear: A correlation between fired engines and a laboratory simulator

Barber

Ludema

1987

Wear

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“…Previous works described the potential sources for the abrasive particles responsible for the cylinder bore axial scratches: debris removed from the cylinder and rings during and after the engine break-in stage [27]; thin dust particles, predominantly ceramic, originated from external sources such as the air, which would not have been captured by the filtering element due to its small size [27,29]; cold worked material detached from the TDC region [44]; particles left in the engine during manufacture and assembly [27,59]; cylinder bore material detachment due to delamination associated to a graphite pocket termination [53,54]; hard carbonaceous residues formed during engine combustion, whose content are highly influenced by the fuel type [56,57]. Table 4: Surface observations category.…”

Section: Literature Review and Research Fundamentalsmentioning

confidence: 99%

On the plasma-assisted modifications of pre-textures surfaces: shallow depth nitriding in cast iron, topography and instrumented sclerometry test response.

Filho¹,

dos²

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A concept of plasma treatment for enhancing pre-textured surfaces of components made in pearlitic gray cast iron is proposed. It consists of a plasma nitriding at low temperatures and short times, in order to increase the hardness of the surface by means of a shallow depth nitride formation in the surface of the iron. As a result, the roughness pattern of a previously textured surface is preserved after the treatment. A review on the wear of internal combustion engine cylinders along with background research was conducted, which consisted in the description of cylinder bore wear features observed experimentally. The background research substantiated the significance of initiatives to enhance wear and friction response of pre-textured surfaces made of cast iron, such as the internal combustion engine cylinders. A series of plasma nitriding experiments was run on specimens extracted from engine cylinders. Flat specimens, obtained from blanks extracted from the cylinder wall of an engine cylinder block, were textured in laboratory in order to emulate the typical roughness distribution of an ordinary cylinder bore plateau honing process. Complementarily, a case-study experiment was performed in a honed sample of an internal combustion engine cylinder, whose surface in its original form (cylindrical) has been textured through industrial honing operations. Therefore, one among the potential applications of the research has been assessed. 3-D interference roughness measurements were performed before and after the plasma treatment to assess topographic stability of the textured surfaces. ε-Iron nitride (Fe 3 N) formation was identified via X-ray diffraction analysis. In addition, nitrogen concentration profile was quantitatively evaluated using wavelength-dispersive (X-ray) spectroscopy microanalysis, substantiating the nitride formation at shallow depth. Microhardness measurements and instrumented linear sclerometry test ('scratch test') results indicated that ε-iron nitride formation and solid solution hardening could provide enhanced properties to the surface of general pearlitic cast iron components, such as increase of wear resistance, and decrease of apparent coefficient of friction, in the assessed conditions. The results demonstrated that the roughness texture pattern was satisfactorily preserved after the treatment, which was supported by direct observation of the surfaces via scanning electronic microscopy.

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Effects of ethanol content on cast iron cylinder wear in a flex-fuel internal combustion engine–A case study

Filho

Tschiptschin

Goldenstein

2018

Wear

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Observations on Cylinder-Bore Wear

Cited by 5 publications

References 0 publications

The break-in stage of cylinder-ring wear: A correlation between fired engines and a laboratory simulator

The break-in stage of cylinder-ring wear: A correlation between fired engines and a laboratory simulator

On the plasma-assisted modifications of pre-textures surfaces: shallow depth nitriding in cast iron, topography and instrumented sclerometry test response.

Effects of ethanol content on cast iron cylinder wear in a flex-fuel internal combustion engine–A case study

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