THE EFFECT OF THE PERIOD OF CHUTTER ON THE FORMATION OF A PROFILE OF PROCESSED SURFACE AT THE END CYLINDRICAL MILLING

Abstract

The article shows that the wavy step of the machined surface depends on the waviness step on the cutting surface, which in turn depends on the period of chatter and the cutting speed. To carry out the research, we used the method of experiments on the stand, the design of which allows recording oscillograms of the part oscillation in the milling process, separating them into fragments and studying the effect of the obtained oscillogram parameters on the quality parameters of the processed surface. The authors present the results of studies of the influence of the period of chatter on the value of the wavy step on the cutting surface. It is shown that with an increase in the spindle rotation frequency on the cutting surface, the number of wave’s decreases, but their base and pitch between them increase. To cut the base, a larger number of tool cuts are required, therefore, the wavy step increases with the frequency of rotation on the machined surface. An increase in feed leads to an increase in the thickness of the section of the layer being cut, a decrease in the period of chatter and a wavy step on the cutting surface. Therefore, with an increase in feed, the wavy step decreases on the treated surface. The regression equations between the waviness step on the cutting surface and on the machined surface are obtained. It is shown that when milling with an increase in the period of free oscillations, the period of self-oscillations increases. The results can be used to predict the quality parameters of the treated surface depending on the dynamic conditions during the opposite end cylindrical milling.