Comparative Study on Stability of Robotic Longitudinal Vibration and Longitudinal-torsional Ultrasonic Milling

doi:10.3901/JME.2021.07.010

Abstract

Abstract: Severe chatter caused by industrial robot milling of large spacecraft cabin stents, which results in low process flatness is a knotty problem. Robotic longitudinal-torsional rotary ultrasonic milling (RRUM-LT) is proposed innovatively. Firstly, the tool tip trajectory of RRUM-LT was analyzed. Then RRUM-LT stability domain is solved and compared with robot one-dimensional longitudinal rotary ultrasonic milling (RRUM). Finally, the robotic milling experiments are carried out to contrast the milling forces and the tool marks on the machined surface between two methods. Calculation and experimental results demonstrated that the stability domain of RRUM-LT is improved 46.7% compared with RRUM. And the average reduction of milling force increased 24.7%. Meantime, the addition of high-frequency torsional vibration decreased the tool marks height on the machined surface of RRUM by 48.7%. The above conclusions provide a technical basis for high-precision and high-efficient processing of large spacecraft cabin.

Key words: robotic machining, robotic longitudinal-torsional ultrasonic milling, robotic milling stability, cutter mark

CLC Number:

TG54

ZHENG Kan, LIAO Wenhe, SUN Lianjun, LIU Lixia, TIAN Wei, XUE Feng. Comparative Study on Stability of Robotic Longitudinal Vibration and Longitudinal-torsional Ultrasonic Milling[J]. Journal of Mechanical Engineering, 2021, 57(7): 10-17.

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