Laser ablation microprocessing of elements of internal combustion engine

• Autorzy: Napadlek W.

Warianty tytułu

PL

Ablacyjna mikroobróbka laserowa elementów silnika spalinowego

• Języki publikacji: PL

Abstrakty

EN

In the future many of spark ignition engines will be fuelled by the direct injection of the compressed natural gas. The spark ignition engines fuelled by CNG with lean and stratified charge in a low load mode require much more controlling of the air-fuel ratio than the diesel engines. The paper describes the total problems of the charging of SI engines particularly with direct injection of CNG. The control of the delivered mass of the fuel and the air in order to obtain the required mixture composition is given in mathematical way. The total control system of the engine with turbocharger, the CNG injection system and the model of gas flow in the exhaust and inlet ducts are shown in diagrams with wide work explanation. The paper concerns to the important problems of fuelling of "downsizing "new SI engines in order to fulfil the future exhaust emission requirements. The publication bases partially on the work which was done in the European project. The work was the first approach in order to determine the non-stationary work of the turbocharger in spark ignition engine. Main conclusions of the work are: the pneumatic actuator in the waste-gate system is not suitable in the turbocharged spark ignition engines with direct CNG injection, the pressure and temperature before the turbine and in the inlet pipes fluctuates with not equal values of oscillations, the work was the first approach in order to determine the non-stationary work of the turbocharger in spark ignition engine.

EN

On the base of literature data as well as on the author 's papers a review of the state-of-the art in material surface engineering using laser ablation processing is presented. A special emphasis is put on application of lasers with short and ultra-short pulses. The author's suggestions for definitions' scope and systematization of laser processing into qualitative groups are discussed. The point and capabilities for technological application of laser microprocessing of elements of internal combustion engines are shown. Selected results of the author's works devoted to ablative profiling of oil reservoirs in the upper zone of cylinder sleeves, laser removal of carbon deposits from piston heads and piston rings, cylinder sleeves, combustion chambers, and laser removal of oxides from internal combustion engine frames and heads are presented. An idea of modification and laser shock peening of selected enigine elements like frames, valves, and timing gear rollers is also presented. The selection results of investigation of technological superficial layer on the valve steel x45CrSi i9-3 (H9S2) formed by duplex technology: glow discharge nitriding and modification by impulse laser treatment on described. Performed experiments on chosen elements of combustion engines pistons, piston-rings, heads, bodies, valves, cylinder liners, crank-shafts confirmed the usefulness of proposed technology.

Słowa kluczowe

PL

ablacyjna mikroobróbka laserowa; warstwa wierzchnia; elementy silnika spalinowego

EN

laser ablation microprocessing; surface layer; elements of internal combustion engine

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2007
• Tom: Vol. 14, No. 4
• Strony: 273--284
• Opis fizyczny: Bibliogr. 5 poz., rys.

Twórcy

autor

Napadlek W.

• Military University of Technology Faculty of Mechanical Engineering Gen. Sylwestra Kaliskiego 2, 00-908 Warszawa, Poland tel.: [phone],

Bibliografia

• [1] Steen, W. M., Laser material processing – an overview, Journal of optics A: PURE AND APPLIED OPTICS 5, pp.3-7, 2003.
• [2] Meijer, J., Laser beam machining (LBM), state of the art and new opportunities, Journal of Materials Processing Technology 149, pp. 2-17, 2004.
• [3] Marczak, J., Napadłek, W., Sarzyński, A., Modyfikacja właściwości warstwy wierzchniej aluminium za pomocą laserowej fali uderzeniowej, Inżynieria Materiałowa nr 5(147), str. 622- 624, Katowice, 2005.
• [4] Napadłek, W., Sarzyński, A., Marczak, J., Analiza procesów zachodzących na stopach aluminium podczas ablacji laserowej, Przegląd Spawalnictwa nr 5-6, s. 64 - 67, 2006.
• [5] The paper was performed within N508 054 32/3758 project financed by the Ministry of Science and High Education.