Abstract
Despite reduced resistance to wheel rim wear, after every grinding, only geometrical parameters of wheels are restored at maintenance depots. A tendency towards a decrease in the exploitation of wheel rim working edge induces the acquisition of new wheels, is related to a considerable increase in axle load and train speed as well as linked to the ineffective methods of repairing wheel rim working edge. A solution to the problem of restoring the surface of wheelset rolling, as a wider problem of rolling stock durability, is determined by the fact that the breakdown of the rolling wheelset and the loss of its efficiency shortens the service time of the wheelset. The cost of pointless and inefficient renovations of geometrical wheelset parameters increases and is of a very high rate. The problem of efficient renovations to rims and steel used for wheels within the maintenance of wheelsets becomes a burning issue today.
Highlights
In order to find ways of prolonging wheel working time and improving the reliability of their exploitation, it is necessary to know the general picture of operating conditions for rolling stock, the circumstances of damage while changing their dynamics, wear resistance, work refusal and work continuance
Any of damages to the surface of wheel roll has a negative influence on cutting conditions while restoring its profile
The wheel passes to compact contact with the rail and flange wear sharply slows down and takes place when both flange and the profile of the roll surface wear at the same time; mostly it gets to condemn the thickness of a wheel pair of flange ‘B’
Summary
In order to find ways of prolonging wheel working time and improving the reliability of their exploitation, it is necessary to know the general picture of operating conditions for rolling stock, the circumstances of damage while changing their dynamics, wear resistance, work refusal and work continuance. When the circle wears off, rotational speed increases and cutting speed is kept unchanging Grinding both the wheel roll surface and rim is carried out by performing circle cuttings. The company Sculfort Systemes Sonim presented the results of research on the comparison of the following three methods for secondary grinding of a wheelset: grinding, milling and turning This enabled French National Railway Corporation SNCF (Société Nationale des Chemins de Fer Français) to decide on choosing processing by turning on a digitally controlled machine with a wear-resistant tool made from the titan-carbide layer. The company did not research the process of high-speed grinding because they considered the possibility of using the above-mentioned methods for repairing high-speed equipment when the quantity of metal removed from the wheel rim was not large. We shall consider the HSPG mode when cutting speed is Vk 80 m/s and relation between the grinding circle and the wheel (detail) is determined by the following expression: 5.5 M0.79
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