Dynamic modeling of ultra-precision fly cutting machine tool and the effect of ambient vibration on its tool tip response

Abstract

The dynamic performances of an ultra-precision fly cutting machine tool (UFCMT) has a dramatic impact on the quality of ultra-precision machining. In this study, the dynamic model of an UFCMT was established based on the transfer matrix method for multibody systems. In particular, the large-span scale flow field mesh model was created; and the variation in linear and angular stiffness of journal and thrust bearings with respect to film thickness was investigated by adopting the dynamic mesh technique. The dynamic model was proven to be valid by comparing the dynamic characteristics of the machine tool obtained by numerical simulation with the experimental results. In addition, the power spectrum density estimation method was adopted to simulate the statistical ambient vibration excitation by processing the ambient vibration signal measured over a long period of time. Applying it to the dynamic model, the dynamic response of the tool tip under ambient vibration was investigated. The results elucidated that the tool tip response was significantly affected by ambient vibration, and the isolation foundation had a good effect on vibration isolation.

Tool‐tip vibration prediction based on a novel convolutional enhanced transformer

“…Chen and Zhao first developed a theoretical model to extract relative tool‐workpiece vibration from the machined surface and used this model to predict the surface roughness in SPDT. Recently, some researchers have investigated the dynamic modeling of UPFC and its impact on surface roughness generation, specifically taking tool‐tip vibration into account 11,16–20 . Ding et al 16 developed a dynamic model of the UPFC machine tool using the transfer matrix method for multibody system (MSTMM) 21 and simulated the tool‐tip vibration.…”

“…The authors' investigation revealed that two specific mode shapes played a critical role in the vibration of the tool‐tip, ultimately leading to the pronounced waviness observed on the machined surface. Finally, one study focused on the effect of ambient vibration on tool‐tip response during UPFC of copper 20 . After validating the dynamic model of the machine tool, an ambient vibration signal was applied to it.…”

“…Finally, one study focused on the effect of ambient vibration on tool-tip response during UPFC of copper. 20 After validating the dynamic model of the machine tool, an ambient vibration signal was applied to it. It was stated that the vibrations at the tool-tip are notably influenced by ambient vibrations, consequently affecting the generated surface.…”

“…Recently, some researchers have investigated the dynamic modeling of UPFC and its impact on surface roughness generation, specifically taking tool-tip vibration into account. 11,[16][17][18][19][20] Ding et al 16 developed a dynamic model of the UPFC machine tool using the transfer matrix method for multibody system (MSTMM) 21 and simulated the tool-tip vibration. Although their method was computationally efficient, the model did not consider the effect of material-induced vibration.…”

Magnetic ring array with high-amplitude negative stiffness for high performance micro-vibration isolation

“…Low-frequency micro-vibration disturbances are a crucial factor affecting the performance of mounting, testing and experimentation of cutting-edge ultra-precision equipment and systems (Ding et al, 2020; Sayapin and Artemenko, 2016). Methods of vibration isolation and vibration energy harvesting came into being (Liu et al, 2021a; Lu et al, 2021).…”