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Process factors of impact on OEE for lathes for machining of wheelset

100%

Stryczek R. , Szczepka W.

2016

tom Vol. 16, No. 3

126--140

Lathes for machining of wheelsets are the specific class of production means, for which the maintaining of satisfactorily high value of coefficient of overall equipment effectiveness (OEE) is very difficult and depends on many different factors. In this study it has been focused on the process factors which influence shaping of OEE for this group of lathes. These include: optimizing the geometry of the wheel flange, identifying and optimization of partition of machining allowance, segmentation and parameterization of machining programs, adaptive control of roughing as well as detecting and reducing of occurrence of slippage between the drive rollers and the machined wheel. A particularly difficult problem is to detect and avoid slippage of drive rollers at the moment of stopping of the machined wheelset, as a result of occurrence of excessive cutting resistances. In the study it has been presented a new method for detecting of slippage and reacting through synchronous actions, to the occurrence of slippage in the friction drive lathes. The method described in this work has been implemented in real industrial conditions.

Materiały stosowane w napędach ciernych oraz metody ich badań

75%

Porąbka A. , Blicharski M. , Laska J.

Transport Przemysłowy i Maszyny Robocze

2012

tom Nr 2

72--79

Tribologia połączeń mechaniczno-dynamicznych jest określana jako nauka o oddziałujących ze sobą i będących we wzajemnym ruchu powierzchniach. Ruch jednej powierzchni ciała stałego względem drugiej jest istotny dla funkcjonowania wielu rodzajów mechanizmów, ponieważ w maszynach znajduje się wiele części składowych, które pracując, trą o siebie. W niektórych przypadkach tarcie pomiędzy dwoma powierzchniami jest pożądane, jednak nie we wszystkich.

Understanding mechanisms of dynamic motion of solid surface with interfacing materials as well as tribological properties of the materials is essential to protect equipment and machinery from dilapidation. In many cases, friction between two surfaces is desired. Brakes, clutches, drives are mechanisms where friction is crucial. Interacting between tire tread and the surface of the road is another example. However, interaction between moving surfaces may result in loss of material in one or both of contacting surfaces. In majority cases friction wear is a negative phenomenon, leading to loosening motioning parts, vibrations, gliding, loss of precision, and the enlarged mechanical lumber, and yet further wear. This results in increased costs due to more frequent replacement of working parts. Wear can be minimized by use of materials with appropriate tribological properties or modifying the surface properties. Another problem in materials engineering is that depending on the type of the friction connection (e.g., sliding or rolling), the required tribological properties of interacting elements might be significantly different, and should be strictly adjusted to the application. In this article materials applied in friction drives, and methods of their characterization are reviewed.