Optimization and Experimental Study of Intelligent Spindle Liquid Integrated Balancing Terminal

The intelligent spindle is the core development direction of the spindle in the future. Liquid injection on-line dynamic balancing technology is a significant technical approach to realize the unbalancing vibration control of the spindle with high accuracy and reliability. In view of the low control accuracy and control stability of balancing caused by the chamber of the existing liquid injection balancing terminal, considered the complex state of oil and gas flow in the balancing terminal under the condition of high speed rotation. Then a three dimensional numerical simulation of fluid state of flow passing through the balancing terminal chamber is built by FLUENT. After comparing the synthetic centrifugal force, turbulence and the distribution of liquid in different cavities, the shape of the balancing terminal chamber is determined. 3.5 mm is selected as the wall thickness on main stress surface of the outer wall of the chamber, and the minimum wall thickness of the rest is 2.5 mm, which realizes the lightweight design of the balancing terminal. Under these conditions, a new type of integrated injection terminal is designed and manufactured by 3D printing (Three Dimension Printing) technology. At last, a proper online balancing strategy was processed, and the experimental results of the balancing terminal on the high-speed intelligent spindle vibration monitoring and balancing active control test bench were compared. The maximum unbalancing vibration decline rate of pre- and post-optimization balancing terminal reached 81.8%, and the post-optimization balancing terminal even reached 97.1%. The experimental results show that the precision and stability of the optimized system are greatly improved.