INFLUENCE OF FEED ON TREATED SURFACE PROFILE FORMATION AT MILLING UNDER SELF-OSCILLATIONS

Abstract

The PURPOSE of the paper is to study the effect of feed at the end cylindrical milling under conditions of self-oscillations on the formation of machined surface profile. METHODS. The study is based on the experimental research methods that enable the examination of the influence of technological factors on the oscillatory processes occurring in the cutting zone. The method of dividing the oscillograms obtained at milling into the basic fragments that reflect the shape of the cutting surface allows to analyze the shaping of the treated surface. RESULTS AND THEIR DISCUSSION. The relationship between the feed and waviness parameters of the treated surface at end cylindrical milling under conditions of self-oscillations is shown experimentally using the basic fragments of oscillograms for the analysis of cutting surfaces. It is determined that the pitch and waviness height on the treated surface reduce as the feed is increased. This is due to the decrease in the period and amplitude of self-oscillations which determine the geometry of the wavy track on the cutting surface. Correlation dependences between the feed, the period of self-oscillations, the pitch and the waviness height of the treated surface are determined. CONCLUSIONS. At the end cylindrical milling under conditions of self-oscillations an increase in feed rate leads to a decrease in the pitch and waviness height of the machined surface. The obtained regression equations can be used at the design stage of the technological process to assess the effect of the set feed on the treated surface.