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Abrasive wear resistance of Fe3Al and Satellite 6 coatings for the protection of valve seats surfaces

Szczucka-Lasota Bożena, Tarasiuk Wojciech, Cybulko Piotr, Węgrzyn Tomasz

Zeszyty Naukowe. Transport / Politechnika Śląska

2023

z. 118

219--228

The development of a technology that increases the service life of valve seats in CNG/LNG-powered vehicles requires the appropriate selection of material and the technology of its application. Commercially used valve seat materials show accelerated wear under operating conditions, especially in natural gas vehicle engines. The authors developed a new material concept and a new technological concept for the protection of the valve seat in CNG/LNG-powered vehicles. This article aims to present the first stage of tribological research. Two materials were used in the research: Stellite 6 alloy and Fe3Al intermetal. A commonly used material for valve seats of combustion engines is Stellite 6. The Fe3Al is the new proposed material coating for the protection of the valve seats of internal combustion engines. This article compares the abrasive wear resistance of these materials. The abrasion tests were performed on a T-11 pin-on-disc tester, and the counter-sample was steel S235JR. The test conditions were similar to those prevailing during the operation of the valves in the head of the internal combustion engine, without the influence of temperature. The obtained results indicate that the Fe3Al intermetal is characterized by a lower coefficient of friction and lower wear intensity than Stellite 6. The results confirm that the Fe3Al phase is a prospective material to be used as a protective material on the valve seat of vehicles.

The influence of the engine load on value and temperature distribution in the valve seats of turbo diesel engine

Gustof P., Hornik A.

Transport Problems

2009

T. 4, z. 2

37-42

In this paper was presented the numerical computations of the influence of engine load on value and temperature distribution of characteristic surfaces of the heat transfer of the valve seats in Turbo diesel engine at the beginning phase of its work. The computations were performed by means of a two-zone combustion model, the boundary of III kind conditions and the finite elements method (FEM) by adaptation of the COSMOS/M program.

W niniejszej pracy przedstawiono wyniki obliczeń wpływu obciążenia na wartość i rozkład temperatury charakterystycznych powierzchni wymiany ciepła gniazd zaworowych dla doładowanego silnika z zapłonem samoczynnym w początkowej fazie jego pracy. Obliczenia numeryczne zostały przeprowadzone przy zastosowaniu dwustrefowego modelu procesu spalania, warunków brzegowych III rodzaju oraz metody elementów skończonych (MES) za pomocą programu COSMOS/M.

Roundness error prediction in valve seat machining based on cutting force model and machine tool system dynamics

Powałka B.

Advances in Manufacturing Science and Technology

2008

Vol. 32, nr 1

45-43

This paper presents a methodology of valve seat machining force model development. A cutting force model coefficients are calibrated without the need of performing separate cutting tests for the blades of the valve seat tool. The developed cutting force model is validated using results of valve seat machining when the misalignement of the tool and workpiece axes was introduced. Also the model for the prediction of the roundess error that employs machine tool dynamics represented by frequency response function and cutting force model is proposed. Prediction quality of the roundness error model is compared to the CMM profile measurements.

W pracy przedstawiono metodę kalibracji modelu mechanistycznego sił skrawania w obróbce gniazd zaworów. Metoda nie wymaga prowadzenia prób dla pojedynczych ostrzy skrawających. Model poddano walidacji w próbie skrawania, w której występował celowo wprowadzony błąd osiowości. Omówiono również model tworzenia predykcji błędu okrągłości na podstawie częstotliwościowej funkcji przejścia i modelu procesu skrawania. Uzyskane wyniki poddano weryfikacji, prowadząc pomiary za pomocą maszyny współrzędnościowej.