Abstract
The multi-energy vibration processing, namely the combination of different energies or forces acting on a free abrasive medium for grinding of metal parts, is becoming more used in finishing processes, in recent years. However, the complexity that is involved in the aforementioned process requires a careful look in the particularities of the process itself in general and the movement of the abrasive media, in particular. In this paper, the nature of the collective movement of abrasive granules between the independently oscillating surfaces of the reservoir and the processed parts is described. This study presents the dissipation of the kinetic energy of the granules in a pseudo-gas from the working medium granules. The motion of the medium granules near the part surface, which is caused by pseudo-waves initiated by vibrations of the working surfaces of the vibration machine reservoir, is demonstrated. Furthermore, the nature of the motion of the granules near the oscillating part surface is described. The analysis that is presented here permits the determination of metal removal quantity from the surface of the workpiece as a result of multi-agent group action of the vibrating reservoir surface and the processed part. The optimal conditions for the finishing process can be determined based on the analysis presented.
Highlights
In this paper, the results of the theoretical simulation of the situations that arise in the case of multi-energy vibration processing of parts are presented
The physical situations of multi-energy vibration processing of autonomously moving parts significantly differ from situations when pseudo-gas from abrasive granules moves during the classical vibration processing, when the parts are placed “heaped up” or “fixed” in the reservoir of a vibration machine
By a granule of metal from the surface of the processed part and by the pressure exerted by the group of pseudo-gas granules on the processed part surface; kωs, kωd, kAs, kAd are the coefficients of the speed hVx i corrections to the circulation motion of the granules according to the parameters of the frequency and amplitude of the vibrations of the reservoir working surface and the part; C ≈ (10 − 30) mc 2 ; R is the average radius of the abrasive granule; and, t is the time of vibration processing
Summary
The results of the theoretical simulation of the situations that arise in the case of multi-energy vibration processing of parts are presented. The physical situations of multi-energy vibration processing of autonomously moving parts significantly differ from situations when pseudo-gas from abrasive granules moves during the classical vibration processing, when the parts are placed “heaped up” or “fixed” in the reservoir of a vibration machine This assumption is based on the conclusions of previous works [1,2,3], where it is asserted that, under the influence of autonomous oscillations of the working surfaces of the reservoir and the processed parts, the granules of the medium acquire significant kinetic energy and they begin to perform movements analogous to the motion of atoms or gas molecules. Such a scheme allows for us to reveal the main theoretical regularities of the interaction of the abrasive granules activated by the oscillating walls of the reservoir with the surfaces of the autonomously moving processed parts
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