Investigation of the surface of a laser-treated cast iron cylinder bore

2012 ◽  
Vol 103 (10) ◽  
pp. 1223-1227 ◽  
Author(s):  
Kornél Májlinger ◽  
Péter J. Szabó
Keyword(s):  
Cast Iron ◽  
Cylinder Bore

Plasma-Texturing Surface Treatment of Grey Cast Iron for Friction Reduction

2020 ◽  
Vol 400 ◽  
pp. 82-90
Author(s):  
Wei Zha ◽  
Ran Cai ◽  
Jing Zeng Zhang ◽  
Xue Yuan Nie
Keyword(s):  
Cast Iron ◽  
Surface Morphology ◽  
Aqueous Electrolyte ◽  
Sample Surface ◽  
Grey Cast Iron ◽  
Environmental Benefits ◽  
Friction Reduction ◽  
Textured Surface ◽  
Grey Cast ◽  
Cylinder Bore

A new surface texturing technique, based on liquid plasma discharging in an aqueous electrolyte, is proposed to modify the surface morphology of grey cast iron. During the process, a grey cast iron sample serves as a cathode where the reduction of hydrogen from the aqueous electrolyte occurs and consequently plasma discharging is generated on the sample surface under applied high voltages (up to 480V). The formed hydrogen bubbles are exploded during the electrical discharging, leaving an irregular array of craters on the sample surface due to the high temperature and shockwaves of the plasma micro-arc discharging. After polishing the crater-like textured surface, surface roughness and oil retention are measured by a profilometer. Reciprocating tribotests are utilized to determine the coefficients of friction. The surface morphology of the polished and tested surface is studied by SEM. The same tests are also conducted for the cast iron with a cross-hatched surface. These two set of results are compared to determine the effects of the texturing and polishing on friction. The results show that the polishing of textured surface can decrease the roughness and coefficients of friction significantly at starved lubricating conditions. This method has potential to be applied on the cylinder bore surface of a cast iron liner for the internal combustion engine (ICE). By honing the textured bore surface, the friction between piston and cylinder bore is expected to decrease and the ICE efficiency to increase for environmental benefits.

Simulation of Cylinder Bore Surface Finish Parameters to Improve Laboratory-Scale Friction Tests in New and Used Diesel Oil

2001 ◽  
Author(s):  
Peter J. Blau
Keyword(s):  
Cast Iron ◽  
Surface Finish ◽  
Testing Machine ◽  
Cylinder Liner ◽  
Laboratory Scale ◽  
Engine Oil ◽  
Wear Testing ◽  
Average Roughness ◽  
Arithmetic Average ◽  
Cylinder Bore

Abstract The development of alloys, coatings, surface treatments, and lubricants for improved cylinder liners and rings has historically included friction and wear testing. The correlation of results from motored engines or laboratory-scale tribotests with those from full-scale, fired engines remains a subject of contention. Attempts to develop valid engine wear simulators have met with varying degrees of success. Complexities in understanding and duplicating the relevant contact conditions in fired engines have challenged the designers of sub-scale, simulative laboratory tests. The current paper describes one aspect of this problem; namely, simulating the cylinder bore surface finish for use in bench tests. A rapid method to prepare cast iron test specimens that have similar surface roughness parameters to a production cast iron cylinder liner has been developed. To compare the sliding response of simulated liners with actual liners, cast iron specimens were friction-tested in both new and used 15W40 commercial diesel engine oil, in mineral oil, and without liquid lubrication. A reciprocating, ball-on-flat testing machine was used with test lengths that ranged from 100 to 20,000 cycles. Kinetic friction coefficient data compared favorably between the simulated cylinder liner specimens and actual cylinder liner segments. The friction coefficients obtained in tests with different lubricants on the simulated surfaces were related through a second-degree polynomial to the change in arithmetic average roughness that occurred during running-in. Additional elements of the fired engine environment will be added in the next stages of this research to determine the degree of complexity that is needed to obtain increasingly better simulations.

Laser Treatment of Cast Iron Engine Cylinder Bore with Nanosecond Laser Pulses

2010 ◽  
Vol 659 ◽  
pp. 319-324 ◽  
Author(s):  
Kornél Májlinger ◽  
Péter János Szabó
Keyword(s):  
Cast Iron ◽  
Laser Treatment ◽  
Internal Combustion Engines ◽  
Laser Pulses ◽  
Nanosecond Laser ◽  
Combustion Engines ◽  
Near Surface ◽  
Functional Aspects ◽  
Engine Cylinder ◽  
Cylinder Bore

The environmental and polluting materials emission standards in Europe are going to be always stricter, so in order to keep up with them, one of the largest European automotive manufacturer performs a laser treatment on the cylinder bores of their internal combustion engines. Due to the laser treatment, the near surface area of the cylinder bore becomes harder and more wear resistant, furthermore, due to the inhomogenity of the pearlitic matrix and graphite lamellae, oil reserving holes are formed. In our present work we investigated the laser treated layer of cast iron cylinder bores with lamellar graphite. Samples prepared with two different lasertypes and different energies were investigated on behalf of metallographic and functional aspects.

scholarly journals Formation of surface layer on cast iron cylinder bore due to nanosecond laser impulses

2009 ◽  
Vol 53 (2) ◽  
pp. 75
Author(s):  
Kornél Májlinger ◽  
Péter J. Szabó ◽  
Kristóf Bobor
Keyword(s):  
Surface Layer ◽  
Cast Iron ◽  
Nanosecond Laser ◽  
Cylinder Bore

Investigation on the Cutting Process of Plasma Sprayed Iron Base Alloys

2010 ◽  
Vol 447-448 ◽  
pp. 821-825 ◽  
Author(s):  
Kan Ding ◽  
Hiroyuki Sasahara ◽  
Syuji Adachi ◽  
Kimio Nishimura
Keyword(s):  
Cast Iron ◽  
Tool Wear ◽  
Cutting Force ◽  
Plasma Spray ◽  
Failure Modes ◽  
Iron Base ◽  
Fine Boring ◽  
Plasma Sprayed ◽  
Cylinder Bore ◽  
Coated Cylinder

In the recent years, the current technology enables only the molten iron base alloys, sprayed on the aluminum alloy engine block thus it can function as a cylinder bore. However, the machinability performance of plasma spray coated cylinder bore in boring process is poor because of severe tool wear compared with the previous cast iron cylinder bore. This paper deals with the results obtained at boring process of plasma sprayed iron base alloys coating to clarify the root cause of tool wear. Preliminary fine boring and turning experiments are conducted on the plasma sprayed cylinder bore, and tool wear, tool failure modes and cutting force were also investigated. The result shows plasma spray coated cylinder bore recorded larger cutting force than the cast iron cylinder bore. Also, this work shows that abrasive effect by the hard oxide particles on the cross-sectioned of machined layer is superior when fine boring plasma spraying iron base alloys coating.

The Bursting of Small Cast-Iron Flywheels

1902 ◽  
Vol 53 (1362supp) ◽  
pp. 21824-21826
Author(s):  
Charles H. Benjamin
Keyword(s):  
Cast Iron
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