Abstract
The article presents the results of studies on the effect of technological parameters of vibration shot peening upon the shape of bearing curves and the parameters of that curve. The topography of surface formed in result of vibration shot peening and pre-machining, which was grinding, were analyzed. The material used in the studies was alloy steel 30HGSA. The shot peening process was performed on an appliance equipped with a kinematic vibrator. Shot peening time t, vibrator oscillations (vibrations) frequency ν, as well as vibrator oscillations amplitude A were changed within: t = 1–15 min, ν = 17,5–35 Hz, A = 10,3–17,3 mm. For measuring surface roughness and determining the bearing curve the appliance T8000 RC120-400 by HommelEtamic was used together with the software. In result of the machining performed surface roughness decreased, and the parameters of bearing curve improved.
Highlights
Vibration shot peening is one of the variants of dynamic burnishing, characterized by striking effect of shot peening elements, most often in a form of balls, upon the treated object
The accomplishment of these studies allowed for presenting the effect of vibration shot peening parameters upon the parameters of bearing curve for roughness profile and upon the shape of Abbott-Firestone curve
The study results demonstrate that the technological parameters of vibration shot peening affect surface roughness and the parameters of Abbott-Firestone curve
Summary
Vibration shot peening is one of the variants of dynamic burnishing, characterized by striking effect of shot peening elements, most often in a form of balls, upon the treated object. The formation of the surface of geometrical structure during shot peening is a complex structure, including “knocking out” hollows, leveling micro-elevations formed in earlier phases of shot peening and accruing hardening of the surface layer in result of condensation traces of blows [12]. Roughness of treated objects surfaces can be characterized by means of numerous parameters [16]. The most frequently applied roughness parameters (Ra, Rz) do not allow for a full assessment of operating properties of treated surfaces. Important information about tribological properties of a given surface is provided by bearing curve, called the Abbott-Firestone curve [1, 11, 15].
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