Abstract
Abstract The main reason for vibration and tool deflection in boring processes are the geometrical, mechanical, and physical properties of the boring bar employed. The diameter of the boring bar is rather small when compared with its length due to the nature of the mechanism in the boring process., In the present study, the influence of the physical properties of boring bars on the deflection amplitudes, natural, and circular natural frequencies were investigated both theoretically and experimentally. For that purpose, seven kinds of boring bars were used. The influence of the characters of boring bars on the amplitudes of tool deflection was investigated both theoretically and experimentally. By contrast, this influence on the natural and the circular natural frequencies were investigated only theoretically. It was found that boring bars filled with rubber and silicon recorded the smallest deflection amplitudes. Particularly, bars filled with silicon manifested the lower tool deflection amplitudes under the selected conditions. It should be added that lower feed rates and cutting depths caused severe tool deflection amplitudes. Moreover, the optimum compatibility between the theoretical and experimental results of tool deflection amplitudes was observed in bars filled with silicon ∅ 16 mm.
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