Abstract
Different processing methods can change the physical–mechanical properties and the microgeometry of the surfaces made by such processes. In turn, such microchanges may affect the tribological characteristics of the surface layer. The purpose of this research was to study the tribological behavior of a test piece surfaces analyzing the changes on the values of the coefficient of friction and loss of mass that appear in time. The surfaces subjected to experimental research were previously obtained by turning, grinding, ball burnishing, and vibroburnishing. The experimental research was performed using a device adaptable to a universal lathe. Mathematical processing of the experimental results led to the establishment of power-type function empirical models that highlight the intensity of the influence exerted by the pressure and duration of the test on the values of the output parameters. It was found that the best results were obtained in the case of applying ball vibroburnishing as the final process.
Highlights
It is known that during the first period of equipment use, the surface roughness decreases gradually to certain values that correspond to the normal use conditions.Due to the reduction in the surface asperities heights, a change in the friction coefficient values is expected
The experimental research was carried out on steel 1.0060 test pieces; the mechanical treatment by burnishing and vibroburnishing could improve the tribological characteristics more compared with the surfaces obtained by turning and grinding
Mathematical models using the power-type function have been determined to highlight the influence of pressure and test duration on the size of the friction coefficient and the microamount of material removed from the test piece due to the tribological test
Summary
It is known that during the first period of equipment use, the surface roughness decreases gradually to certain values that correspond to the normal use conditions.Due to the reduction in the surface asperities heights, a change in the friction coefficient values is expected. The surface roughness reduction is accompanied by removal of the material from the two parts involved in relative movement to each other. Many experimental investigations aimed to highlight the influence exerted by the previously applied machining process on the tribological behavior of the surfaces obtained. Some of these investigations took into account the processes of ball burnishing and ball vibroburnishing as processes capable of affecting the tribological characteristics of the surfaces of the parts. Other researches were directed at defining the experimental conditions to be used when experimentally assessing the tribological behavior of the burnished or vibroburnished surfaces
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