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Wyświetlanie 1-4 z 4
Tytuł:
Analysis of Hard Facing Material Designed for Application on the Forestry Tools
Autorzy:
Ťavodová, Miroslava
Hnilicová, Michaela
Miturska, Izabela
Powiązania:
https://bibliotekanauki.pl/articles/102164.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
hard facing
forestry tools
abrasive wear
microscopy analyses
hardness
utwardzanie
narzędzia leśne
zużycie ścierne
analiza mikroskopowa
twardość
Opis:
The article deals with the assessment specific hard facing material with W2C high content – filled welding rod for manual flame hard facing RD 571. Is was applied in two layers on the samples (16MnCr5 steel) of the tool for crushing undesirable advance growths, frequently used in forestry technologies. The tools work in a heterogeneous environment. They are loaded by abrasive impression of wood mass, which are characterized by various hardness. The material loss on the functional parts is significant. The wear degradation of the tool and its subsequent early decommissioning represents economic losses for forest companies. The investigations conducted under laboratory conditions involved hardness measuring HV10 and HRC, wear resistance testing of materials by friction against loosely fixed abrasive parts, with assessment profile and depth of the mark as well as assessment of quality mixing of the layers, microstructure assessment by SEM with EDX analyses. By evaluating the laboratory tests, the conclusions were drawn to determine the suitability or the non-suitability of the selected hardfacing material in service. Whether the material increases the service life of the undesirable crusher tool, will by verified by performing field trials.
Źródło:
Advances in Science and Technology. Research Journal; 2019, 13, 4; 111-119
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ elementu tnącego na drgania emitowane przez kosy spalinowe do zarośli i trawy
The influence of the cutting element on vibrations emitted by brush cutters
Autorzy:
Wójcik, K.
Powiązania:
https://bibliotekanauki.pl/articles/1311893.pdf
Data publikacji:
2015
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
narzedzia lesne
kosy spalinowe
elementy tnace
glowice zylkowe
pily tarczowe
glowica tnaca dwuzylkowa
glowica tnaca czerozylkowa
glowice nozowe
tarcza tnaca trojnozowa
tracza tnaca osmionozowa
emisja drgan
wibracje
ergonomia
brush cutter
grass trimmer
clearing saw
hand – arm vibration
vibration acceleration
daily vibration exposure
ergonomics
Opis:
Generally, the choice of cutting element used in brush cutters for brush-woods and grasses depends on the type of work on one hand and the size of the engine on the other. However, at the same time, the use of individually chosen cutting elements entails a certain risk of vibration resulting from their varying design and size, which has a big impact on comfort and working time, but most importantly on operator health. The aim of the study is a preliminary analysis of the dangers due to vibration of brush cutters and to determine how the choice of the cutting element affects the intensity of the vibrations emitted by the machine. Furthermore, one aim was to determine the daily vibration exposure, relative to an equivalent value of vibration, experienced by the device operator. This study involved four models of brush cutters with three machines of each model, differing in size (displacement and engine power) and equipped with six different cutting elements. A vibration acceleration test was carried out in accordance with the applicable PN-EN ISO 5349-1 and 2: 2004 and Directive 2002/44 / EC. An analysis of the obtained results leads to the conclusion that the examined professional brush cutters emit vibrations of such intensity that the daily exposure limit (5 m ∙ s-2) is exceeded more than twofold. One cannot directly determine the influence on vibration intensity by the type of cutting element or the exhaust, but it should be noted that use of a cutting unit as recommended by the manufacturer creates less harmful vibrations, especially when the engine runs at the nominal rotational speed. In order to minimize the risk due to vibrations from brush cutters, engines with a cylinder capacity below 45 cm3 are recommended to be equipped with trimmer heads and disk knives, while engines with over 50 cm3 should run with circular saws.
Źródło:
Leśne Prace Badawcze; 2015, 76, 4; 331-340
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
O narzędziu służącem do mierzenia u drzew stojących, średnicy dolney i średnicy górney w upodobanej wysokości
Autorzy:
Kozłowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/817609.pdf
Data publikacji:
1829
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
dendrometria
drzewa lesne
drzewa stojace
srednica
pomiary
narzedzia pomiarowe
Źródło:
Sylwan; 1829, 006, 1
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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