Abstract
The article is focused on the possibilities of using the tangential oscillations of the tool to form a microrelief of the workpiece surface. The diagram of the cutting tool oscillation trajectory during vibrational turning is presented. The scheme for calculation of the values of two tangential oscillation components is presented. The photos of the surfaces obtained by machining of the workpieces with the use of vibrational turning are provided. The results of the surface microgeometry modeling under the turning with tangential oscillations imposition of the tool are given. The dependence of the surface microgeometry height on the workpiece rotation speed and the tool oscillation frequency is determined. The factors which influence on the workpiece surface microgeometry formation are specified.
Highlights
It is known that at normal turning the roughness of the machined surface is formed due to the axially moving of a cutting tip
The use of vibrational turning method allows combining two schemes of surface roughness microgeometry on the machined surface which correspond to the longitudinal turning by the cutter and milling by the cylindrical mill Fig. 4 [3]
The first one reflects the movements of normal turning without the imposition of oscillations, the second one reflects the influence of cutter oscillation on the kinematics of cutting and corresponds to the scheme of surface roughness formation under the milling by a cylindrical mill
Summary
It is known that at normal turning the roughness of the machined surface is formed due to the axially moving of a cutting tip. The size and shape of machined surface micro-irregularities consisting of the residual ridges are determined by the feed rate and the shape of cutting point. The mechanism of surface roughness formation due to oscillating motion under the vibrational turning will differ significantly. The method of vibrational turning with the use of tangential oscillations showed sufficient efficiency for treatment of materials by cutting. The main advantages provided by this method are the reduction of surface roughness, chip crushing and the reduction of cutting forces when turning the hard-to-cut materials and built-up surfaces
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