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1
Content available remote Poobróbkowe utwardzanie powierzchni i jego wpływ na współpracę części w zespole
Streubel A., Kuran M.
Technologia i Automatyzacja Montażu
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2014
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nr 2
113--117
PL
W artykule zaprezentowano sposób umocnienia warstwy wierzchniej wierconego otworu, które towarzyszy procesowi obróbki, a mające wpływ na połączenie dwóch elementów i ich ewentualną współpracę. Ustalono zależność wielkości i głębokości zalegania umocnienia warstwy wierzchniej uzyskanej z wiercenia różnymi wiertłami w trzech różnych materiałach konstrukcyjnych. Pokazano zalety i wady umocnienia powierzchni oraz możliwości sterowania tym procesem.
EN
The paper discusses the phenomenon of strengthening the surface layer of the drill hole, which accompanies the cutting process and affecting the combination of two elements and their possible cooperation. The relation of size and depth to the strengthening of the surface layer was obtained from a variety of drill bits drilling in three different materials. The article presents the advantages and disadvantages of hardening the surface and the ability to control the process.
2
Content available Tribological properties of the seat insert - valve - guide assembly for valve driven magnetoelectrically
Siczek K., Siczek K.
Journal of KONES
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2010
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Vol. 17, No. 4
439-445
EN
The researches have been carried out, where the object has been the set of two friction couples: valve stem - valve guide and valve seat - seat insert. The camless driven valve has been common for each of such cases. The analyzed valve has been driven by magnetoelectrical drive. The speciał research stand has been elaborated and its scheme has been presented in the article. It has been measured the valve lift and valve acceleration, the impact force, the friction force, temperature values for valve guide and for seat insert, sound level during impacting on the stand. The aim of researches has been to determine the dynamic parameters, the friction force between valve stem and valve guide, the impact force for valve impacting seat insert vs. frequency and valve lift. The analyzed valves have mated with seat inserts and valve guides made of cast iron, in oil absence. The valves have been made of TiAl6Zr4Sn2Mo2 alloy. The researched friction couples have operated in temperature equal 293 K. The increase of frequency has resulted in small changes for values of lift and in greater changes of acceleration, during valve impact into its seat insert. The greatest values of impact force and acceleration have been for the small, middle and high values of valve lift, either. The ratio of impact force and valve acceleration has changed in thin bands. The friction force has decreased slightly with frequency increase and has decreased with valve lift increase. The sound level has increased with the frequency increase, and has not been dependent upon valve lift.
3
Content available The simulation researches on the wear for elements of the seat insert-valve-valve guide assembly
Siczek K., Kuchar M.
Journal of KONES
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2010
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Vol. 17, No. 4
431-438
EN
The researches have been carried out, where the object has been the elements of valve trains in the different combustion engines. Those elements have been valve, valve guide and seat insert. The analysed valves have been driven by special camshaft, with the cams of trapezoid shape. The special research stand has been elaborated and its scheme has been presented in the article. The mentioned research stand has been driven by electric motor. The rotational velocity of the camshaft has been controlled and measured. The aim of the researches has been to obtain values of wear for valve, seat insert, valve guide vs. valve lift, and rpm of camshaft. The dynamic parameters have been analyzed for the seat insert - valve - valve guide assembly, experimentally and by simulation either. During researches the values of valve lift, of valve acceleration, of temperature for seat insert and additionally sound level have been measured. The wear of valve, seat insert and valve guide has been measured, basing on their initial and post-research geometry. The results of experimental researches obtained for different materials for valve, valve guide and seat insert have been presented in the article. The simulation model of the analyzed seat insert - valve - valve guide assembly has been elaborated and presented in the article. Such model has been needed to calculate the values o f the settle velocityfor the analyzed valve. The wear of titanium valve has been a little greater than of the steel valve, the wear of cast iron seat insert mating with steel valve has been much greater than for titanium valve case. The wear of valve guides, made of bronze has been several times less than those of cast iron.
4
Content available The researches on the tribological properties of elements of the seat insert-valve-valve guide assembly
Siczek K.
Journal of KONES
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2010
|
Vol. 17, No. 4
423-430
EN
The researches have been carried out, where the object has been the elements of valve trains in the different combustion engines. Those elements have been valve, valve guide and seat insert. The analysed valves have been driven by special camshaft, with the cams of trapezoid shape. The special research stand has been elaborated and its scheme has been presented in the article. The mentioned research stand has been driven by electric motor. The rotational velocity of the camshaft has been controlled and measured. The aim of the researches has been to obtain values of wear for valve, seat insert, valve guide vs. valve lift, and rpm of camshaft. The dynamic parameters have been analyzed for the seat insert - valve - valve guide assembly, experimentally and by simulation either. During researches the values of valve lift, of valve acceleration, of temperature for seat insert and additionally sound level have been measured. The wear of valve, seat insert and valve guide has been measured, basing on their initial and post-research geometry. The results of experimental researches obtained for different materials for valve, valve guide and seat insert have been presented in the article. The simulation model of the analyzed seat insert - valve - valve guide assembly has been elaborated and presented in the article. Such model has been needed to calculate the values o f the settle velocityfor the analyzed valve. The wear of titanium valve has been a little greater than of the steel valve, the wear of cast iron seat insert mating with steel valve has been much greater than for titanium valve case. The wear of valve guides, made of bronze has been several times less than those of cast iron.
5
Content available remote Gładzenie kształtowych otworów prowadnic zaworowych w MAHLE Krotoszyn S.A.
Kosicki A., Kleparski B.
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
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2003
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z. 61 [202]
39-44
PL
Referat zawiera opis technologii gładzenia kształtowych otworów prowadnic zaworowych, opracowanej i zastosowanej w MAHLE Krotoszyn S.A.
6
Content available remote Resistances of machine cutting in drilling of cast iron dedicated for valve guide
Bałamucki J., Streubel A., Szubert Z.
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
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2002
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z. 58 [193]
45-52
EN
Foundations and conditionses of investigations of two sorts of cast iron for diesel engines valve dedicated: till now used W1p and new - alloy, are presented. Example courses of resistances of machine cutting are showed. Results of investigations of machine cutting resistances for three different conditions of cooling are presented.
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