Abstract
In the field of precision machining, the spindle-rolling bearing (SRB) system is widely used on the machine tool as one of the most fundamental and important components. The rotational error motions of the SRB system have significant effects on the machining accuracy (contour accuracy and surface roughness). Over the past decades, much work has been focused on the measurement of spindle balancing and rotational error motions, the vibrations response induced by the nonlinear stiffness and surface waviness of the bearing. However, the formative mechanism of the rotational error motions for the SRB system is not well understood. In this paper, the dynamic model of the SRB system considering the bearing nonlinearity is established. Seeking to reveal the effects of surface waviness of the bearing raceway, unbalance mass and disturbance force on the dynamic rotational error, the modeling method and formative mechanism of the dynamic rotational error for the SRB system is explored both theoretically and experimentally. Then, numerical simulation is performed to analyze the influence of the bearing raceway waviness, unbalance mass and disturbance force on the dynamic rotational error. An experimental setup is established based on a typical SRB system and a series of experiments are carried out. The experimental results are in good agreement with the theoretical and simulation results, which can demonstrate the feasibility and validity of the modeling method. Furthermore, this method can be effectively applied to the design and development phases of an SRB system to improve dynamic rotational accuracy.
Highlights
The spindle-rolling bearing (SRB) system is a key component of the machine tool or other rotating machines, which plays a key role in working
This paper mainly focuses on the modeling method and the formative mechanism of spindle rotational error motion
Fe Fdr and Fb are the dynamic unbalance force caused by unbalanced mass, disturbance force and the time-varying bearing force caused by surface waviness, respectively
Summary
The spindle-rolling bearing (SRB) system is a key component of the machine tool or other rotating machines, which plays a key role in working. It is well known that some key factors including the Hertz contacts, bearing preload, surface waviness, unbalance mass and so on, would significantly affect the dynamic rotational error of the SRB system These factors can significantly decrease the spindle rotational accuracy. It is helpful to the study of running accuracy of the spindle; it is insufficient to investigate the modeling method and formative mechanism of the dynamic rotational error motion. It is worth noting that most research studies have been focused on how to measure the rotational accuracy of the SRB system and how to improve the measuring accuracy and the vibrations response induced by the nonlinear stiffness and surface waviness of the bearing. The structure of this paper is arranged as follows: Section 2 introduces a dynamic model of the spindle-rolling bearing (SRB) system considering the bearing nonlinearity to analyze the effecting mechanism of the error factors.
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