Dynamic properties analysis of ball screw feed system based on improved hybrid model

Abstract

Ball screws are widely used as feed systems for machine tools due to their high transmission efficiency and long service life. However, the large inertia force generated by the ball screw in high-speed motion will excite its flexible mode and cause system vibration. In the actual working condition, the dynamics of the system will also change with the nut position and workpiece mass. In order to further study the modeling method and dynamic properties of the ball screw feed system, this paper firstly improves the traditional hybrid model by introducing an energy loss factor to modify the hysteresis damping of the model. Further, the rationality of the improved model is verified by hammer test. Finally, the model was used to analyze the dynamic properties of the system and to obtain the influence law of workpiece mass and nut position on the system natural frequency.

Analysis of Dual-Driven Feed System Vibration Characteristics Based on Computer Numerical Control Machine Tools: A Systematic Review

“…The second approach uses a beam-element-based finite element model to simulate the screw. This new approach uses a more efficient and concise model description than the previous one [52][53][54]. In addition, the joint surface of the transmitting coupling is designed to characterize the screw-to-table motion, vibration, and force transfer process, which makes it a crucial component of the ball screw's hybrid modeling method.…”