Optimization design and tests for liquid injection type integrated balancing terminal of high-speed motorized spindle

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (15) : 26-33.

YUN Xialun1,2,3, YUAN Shijue1,2,3, MEI Xuesong1,2,3, JIANG Gedong1,2,3, WANG Chen1,2,3

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Abstract

Liquid injection on-line dynamic balancing is one of the main on-line balancing methods of ultra-high speed motorized spindle. Here, in order to solve the problem of balance precision loss caused by low design precision of traditional liquid injection on-line balancing terminal cavity, considering effects of complex oil-gas flow state in balancing terminal cavity under high-speed rotating state, four cavity analysis models with different cross-section shapes were established. The fluid simulation analysis software FLUENT was used to realize 3-D numerical simulation for fluid in balancing terminal cavity based on VOF method. Turbulent flow, liquid distribution and combined pressure of cavity outer wall for liquids with different mass densities in the 4 cavities under the condition of different rotating speeds were studied. The study showed that the 90F shape cavity is the best cross-section shape cavity. The finite element analysis model for the outer wall of balancing terminal cavity was established to optimize parameters of balancing terminal cavity under extreme conditions of the highest rotating speed and cavity fully filled by liquid. The 3-D printing technology was used to manufacture the optimized balancing terminal, and online dynamic balancing tests were conducted on an ultra-high speed milling motorized spindle test platform. The test results showed that the terminal unbalance amplitude under the operating frequency drops by more than 90% before and after balancing to effectively improve balancing performance.

Key words

high-speed electric spindle / online balancing / balancing terminal / cavity / fluid simulation

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YUN Xialun, YUAN Shijue, MEI Xuesong, JIANG Gedong, WANG Chen. Optimization design and tests for liquid injection type integrated balancing terminal of high-speed motorized spindle[J]. Journal of Vibration and Shock, 2021, 40(15): 26-33

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