Abstract
The paper presents functional relationships between surface geometry parameters, feedrate and vibrations level in the radial direction of the workpiece. Time characteristics of the acceleration of cutting tool vibration registered during C45 steel and stainless steel machining for separate axes (X, Y, Z) were presented as a function of feedrate f. During the tests surface geometric accuracy assessment was performed and 3D surface roughness parameters were determined. The Sz parameter was selected for the analysis, which was then collated with RMS vibration acceleration and feedrate f. The Sz parameter indirectly provides information on peak to valley height and is characterised by high generalising potential i.e. it is highly correlated to other surface and volume parameters of surface roughness. Test results presented in this paper may constitute a valuable source of information considering the influence of vibrations on geometric accuracy of elements for engineers designing technological processes.
Highlights
Despite tremendous progress in the construction of both machine tools and cutting tools, effective methods of eliminating vibration in machining are yet to be found [1, 3, 4, 7, 11, 12]
A lack of an increasing trend for RMS vibration acceleration as a function of f was identified for the f range amounting to f = 0.4–0.5 mm/rev and a significant increase in RMS vibration acceleration for higher f values (f = 0.4–0.5 mm/rev)
The analysis of energy density distribution of the cutting tool vibrations signal during C45 steel machining and stainless steel demonstrated characteristic peaks at frequencies equal to 3.7 kHz and 3.6 kHz and 10.6–10.7 kHz, which are a result of self-induced vibrations
Summary
Despite tremendous progress in the construction of both machine tools and cutting tools, effective methods of eliminating (minimising) vibration in machining are yet to be found [1, 3, 4, 7, 11, 12] It concerns the process of machining flexible objects and those susceptible to heat (i.e. thin-walled parts and long, slender rollers) [4,5,6, 8, 9, 15] as well as machining with the use of highly flexible tools (mainly of high overhang) [1, 10]. This kind of vibration in the machine tool-clamp-object-tool system results from the oscillation of friction force and machining
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