Quantitative analysis for effects of structural stiffness on vibration characteristics of machine tool feed system

Liu, Niancong

doi:10.21595/jve.2019.20332

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…Additionally, considering various other characteristics of abnormalities among data (such as scarcity and diversity), a new approach is designed to detect abnormal behavior using normal patterns instead of abnormal patterns from machines [17]. Liu [18] discussed the influence of stiffness in nut, coupling, radial, along with the length and speed of screw on table vibration of torsional and axial vibration. The second Lagrangian equation is used to establish freedom of multiple degree for vibration of axial torsional coupled mathematical model which takes various factors into account.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The influence of variable lead and variable torsional stiffness on the torsional vibration of the table is analyzed. It is observed from the experimental results provide that the design provides future research and theoretical reference for vibration reduction and optimization of structure [18]. Wang, et al used PROOE software to build a THREE-DIMENSIONAL model of a five-axis CNC machine tool.…”

Section: Literature Reviewmentioning

confidence: 99%

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Study of dynamic vibration characteristics and suppression of CNC machine tool during operation

Qiu¹,

Xing-zhou²,

Hui³

et al. 2020

J. vibroeng.

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The rapid development of aerospace, automobile, national defense and other manufacturing industries has continuously improved the performance requirements of high speed and high positioning accuracy of the CNC machine tool feed system. As the thermal deformation error increases, the system structural rigidity decreases, the vibration increases, and accuracy of machine tool reduces. Existing research mainly focuses on the properties of mechanical and single thermal feed system, and less considers the dynamic performance under the action of thermal-mechanical coupling. For the improvement of feed system performance, it is very beneficiary. This paper takes the high-speed tool of CNC feed system as objective, combined with the actual working conditions to analyze the thermal characteristics, dynamic characteristics and vibration characteristics of the system under the effect of thermal-mechanical coupling. The thermal resistance and convective heat transfer of the key joint surface, the application of moving thermal loads, and the establishment of a simulation model to complete the steady-state temperature field, transient temperature field and thermal-structure coupling analysis. The results show that the maximum temperature rise of the feed system is 21.08 °C, The maximum thermal deformation is 17.264 um. The study found that the parameters such as flow rate and airflow temperature have a significant impact on the cooling effect, so the cooling device was further optimized. This paper proposes a control method for cutting chatter of CNC machine tools based on coupling of characteristics of thermal and mechanical. The thermal characteristic of the feed system and the thermal-mechanical coupling vibration characteristic test provides the maximum temperature error of 3.2 %, verifying the correctness of the theoretical method and analysis model. The highest temperature obtained by the test is 39.7 °C, indicating that the high-speed feed system has a large thermal effect. The relative error of the vibration amplitude of the test and simulation is 12.5 %, which verifies coupling in terms of thermal-mechanical. The accuracy of the vibration analysis method; the experiment depicts that the vibration amplitude increases by 19.7 % under the coupling effect of thermal and mechanical, indicating the effectiveness of dynamic characteristics of the high-speed feed system considering the thermal-mechanical coupling effect.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Study of dynamic vibration characteristics and suppression of CNC machine tool during operation

Qiu¹,

Xing-zhou²,

Hui³

et al. 2020

J. vibroeng.

View full text Add to dashboard Cite

show abstract

“…Wang et al (2020) proposed differential feed system that can suppress the effect of motor torque harmonics on speed fluctuation of the table and improve speed smoothness at low-speed operation. Liu (2020) quantitative analysis of influence of structural stiffness on the vibration characteristics of the machine feed system. Zhang et al (2019) pointed out when the preload increases, bearing stiffness presents a nonlinear increasing trend and affects natural frequency.…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of ball screw feed system with abrupt-change-nonlinear drive stiffness

Gao

2021

ILT

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Purpose For ball screw feed system, a sudden start or stop has a great influence on the transmission stiffness, so the axial stiffness mutation of feed system will occur. The purpose of this paper is to study the influence of acceleration on the transmission stiffness and dynamic characteristics of the ball screw feed system. Design/methodology/approach Taking the ball screw feed system as a research object, on the basis of the Hertz contact theory and the mixed element method, axial stiffness model and dynamic model are established. And the system stability was analyzed by the time history diagram and Phase-plane portrait diagram. The feed system was analyzed theoretically and experimentally, the experimental results are in good agreement with the model results. Findings Lead screw lead angle, preload, load and start acceleration affected ball-screw pair, bearing and transmission stiffness. And the load, nut contact stiffness, bearing contact stiffness, preload have a large effect on the transmission stiffness. The results show that a certain acceleration value will make the axial stiffness abrupt change. Originality/value This research provides a useful theoretical support for ensuring a good dynamic for the ball screw feed system.

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“…位置对系统固有频率的影响；WANG 等 [4] 建立了一个多自由度的非线性动力学模型，研究了不同螺母位置、不同几何参数下，进给系统承受不同激励力时的响应情况；LIU 等 [5] 建立了进给系统的九自由度动力学模型，推导了进给系统沿轴向与侧向的恢复力函数，研究了激振幅值对进给系统轴向振动的影响；WANG 等 [6] 基于建立的动力学方程，设计出了一种带调谐质量阻尼器的新型结构丝杠，可以用于改善丝杠的时变振动特性； PISLARU 等 [7] 通过建立的混合动力学模型，更加精确的分析了数控机床进给系统的固有频率以及动态特性；ZHANG 等 [8] 研究了丝杠在不同预拉伸量情况下丝杠螺母的接触变形关系，验证了丝杠预拉伸量对进给系统固有频率的影响； ZHANG 等 [9] 研究了进给系统固有频率随加速度变化的情况，得出加速度达到一定值后会使系统固有频率突变的结论； GU 等 [10] 建立了进给系统的非线性动力学模型，研究了不同激振力、工作台位置和系统质量等对动态特性的影响； LIU 等 [11] 通过建立的多自由度耦合动力学模型，研究了多个因素对丝杠轴向与扭转固有频率的影响；朱坚民等 [12] 基于建立的进给系统有限元模型，通过计算各结合面接触刚度值，研究了结构参数对进给系统固有频率的影响。由此可见，现有关于滚珠丝杠副进给系统的研究多停留在固有频率与进给系统几何或工作参数的关系建模上，而对其因磨损导致的固有频率衰退现象的研究较少。对于经历了长时间运转的滚珠丝杠进给系统，丝杠、轴承等部件均会产生一定的磨损， CHEN 等 [13] 研究了进给系统滚动功能部件因运行磨损导致的精度下降情况；ZHOU 等 [14] 研究了一种基于磨损的新型预紧力衰退评价模型，并将其应用于导轨预紧力预测；ZHOU 等 [15] 研究了滚珠丝杠副预紧力因磨损产生的两阶段下降情况。然而以上研究都并未介绍磨损对进给系统动态特性的影响，实际上运行磨损还会使得对应部件的刚度值降低 [16][17][18][19] ，进而导致进给系统固有频率…”

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Research on the Degradation of the Axial Natural Frequency of the Double-Nut Ball Screw Feed Drive System

2022

Journal of Mechanical Engineering

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To investigate the degradation of the axial nature frequency of the double-nut ball screw feed drive system, the dynamic equation of the feed drive system on the basis of the distributed parameter method and lumped parameter method is proposed, and the axial stiffness degrading model of the feed drive system based on Archard wear theory is established, on the bais of the axial stiffness degrading model and dynamic equation, the axial nature frequency degrading model is summarized. The frequency response curve of the feed drive system within 1.485 million revolutions is collected, the result shows that the natural frequency dropped to 143.2 Hz from 148 Hz. And the maximum prediction error not exceeding 1 Hz, which strongly proves the accuracy of the axial nature frequency degrading model.

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Quantitative analysis for effects of structural stiffness on vibration characteristics of machine tool feed system

Cited by 5 publications

References 10 publications

Study of dynamic vibration characteristics and suppression of CNC machine tool during operation

Study of dynamic vibration characteristics and suppression of CNC machine tool during operation

Dynamic analysis of ball screw feed system with abrupt-change-nonlinear drive stiffness

Research on the Degradation of the Axial Natural Frequency of the Double-Nut Ball Screw Feed Drive System

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