Radial damping characteristics of a drilling tool system in BTA deep-hole vibration drilling

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (14) : 96-104.

ZHENG Liangkui，ZHENG Jianming，LI Xubo，XIAO Shiying，LIU Chi

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Abstract

Because of the poor rigidity of a tool system of boring and trepanning association(BTA) deep hole drilling, machining processes are prone to chatter occuring in several directions, which has a significant impact on the machining accuracy of the hole and the service life of the tool.According to the tool system characteristics, the radial dynamic model for the BTA deep-hole drilling system in drilling process was established and its dynamic characteristics were further studied by using the characteristic equation.In order to obtain the behavior characteristics of the radial vibration of the tool system in condition of common drilling and vibration drilling, the cutting process was discretized into multiple tiny cutting units which meet the continuous condition of the state equation, and the radial vibration displacements of the cutting tool system were solved by the numerical method for difference equations.The simulation and experimental results show that the solutions of the established radial dynamics model are consistent with the experimental results.Vibration drilling has a strong restraining effect on the radial vibration of the tool system.Compared with the conventional drilling, the hole machining roundness and surface roughness are significantly improved.

Key words

deep-hole drilling / vibrating drilling / chatter / cutting unit / numerical simulation

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ZHENG Liangkui，ZHENG Jianming，LI Xubo，XIAO Shiying，LIU Chi. Radial damping characteristics of a drilling tool system in BTA deep-hole vibration drilling[J]. Journal of Vibration and Shock, 2019, 38(14): 96-104

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