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Content available Wear analysis of cemented carbide during turning of cast iron considering economical machining speed
Znojkiewicz N., Korzeniewski D., Wiciak M.
Archives of Mechanical Technology and Materials
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2017
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Vol. 37
27--34
EN
The purpose of this paper is to find economical machining speed during turning of grooves for piston rings with various feeds. In the first part of the paper, literature analysis concerning durability of cutting tools is presented. Next, the wear of cemented carbide cutting tools during turning of cast iron is researched. The research has been done for seven cutting tools. During conducted turning trials, angular speed has been altered from n=530rev/min to n=710rev/min and feeds from f=0.007mm/rev to f=0.105mm/rev. On the basis of Taylor’s equation, which relates cutting speed to tool life, the economical cutting speed is established with the application of two various methods.
2
Content available The influence of vibrations on surface roughness formed during precision boring
Korzeniewski D., Znojkiewicz N.
Archives of Mechanical Technology and Materials
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2017
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Vol. 37
1--5
EN
In this paper, the analysis of vibrations on surface roughness generated during boring with the application of the conventional boring tool and one with the damper is presented. The experiments included the measurement of vibration accelerations carried out with the piezoelectric sensor, as well as the evaluation of surface roughness parameters after each machining pass. The obtained results reveal that in the investigated range, no stability loss was found. Furthermore, the growth of the rotational speed induces the increase of vibration level, as well as the growth of the differences between the vibration values generated during boring with the conventional tool and one equipped with damper. Vibrations have also the direct influence on the machined surface roughness. In case of the tool equipped with the damper, the tool’s overhang L had more intense influence than rotational speed n. However, for the conventional boring tool this dependency was unequivocal.
3
Content available remote Chropowatość po toczeniu materiałów stosowanych w konstrukcjach lotniczych
Chwalczuk T., Rybicki M., Korzeniewski D., Przestacki D.
Mechanik
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2016
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R. 89, nr 10
1312--1313
PL
W artykule określono rozbieżności między rzeczywistą wysokością mikronierówności Rz a teoretyczną Rzt oraz wartość minimalnej grubości warstwy skrawanej hmin dla trzech materiałów obrabianych: stopu tytanu, stali nierdzewnej oraz nadstopu niklu. Badania prowadzono dla różnych wartości posuwu f, promieni naroża rε oraz prędkości skrawania vc.
EN
In this paper the differences between theoretical and obtained after turning surface roughness values and minimal depth of cut hmin for different aircraft materials were discussed. Titanium alloy, stainless steel and nickel super alloy were considered. Test were conducted for different feed range f, nose radius rε and cutting speed vc.
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