螺栓蠕变引起的预紧力松弛对螺栓连接系统动态响应的影响

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration Pub Date : 2024-10-28 DOI:10.1016/j.jsv.2024.118800

Kai Jiang , Zhifeng Liu , Tao Zhang , Feng Wang

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引用次数: 0

摘要

螺栓连接是影响重型机床精度维护的重要环节。由于横梁螺栓长期承受数百千牛的预紧力，随着机床使用时间的延长，螺栓会逐渐蠕变和伸长。预紧力的松弛会导致螺栓刚度下降，从而削弱螺栓连接系统的动态响应。为了揭示螺栓蠕变引起的重型机床横梁螺栓连接性能退化规律，基于 Norton-Bailey（NB）模型，提出了一种分析精密螺纹螺栓蠕变的方法，并研究了螺纹几何形状和摩擦系数对螺栓蠕变应力松弛的影响。考虑到界面接触，基于分形理论推导了界面接触刚度模型。利用 Matrix27 刚度矩阵建立了螺栓梁系统的动态方程。分析了因螺栓蠕变导致界面刚度下降而产生的螺栓系统动态响应。结果表明，螺栓蠕变的应力松弛不仅与蠕变参数有关，还与配偶-螺纹相互作用有关。采用 Matrix27 刚度矩阵建立的动力学模型在计算精度和效率上与实验结果相当，为机床动力学分析提供了技术指导，有效解决了重型机床服役期间横梁螺栓性能退化的科学难题。

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Influence of bolt creep induced pre-tightening force relaxation on dynamic response of the bolted joint system

The bolted joint is an important link that affects the accuracy maintenance of the heavy-duty machine tool. Due to bolts of the crossbeam are under a preload of several hundred kN for an extended period, the bolt gradually creeps and elongates as the machine tool's service time increases. This relaxation of the preload results in a degradation of the bolted stiffness, weakening the dynamic response of the bolted joint system. To reveal that the degradation law of crossbeam bolting performance of the heavy-duty machine tool induced by bolt creep, based on the Norton-Bailey(NB) model, a method for analyzing the creep of bolts with precision threads is proposed, and the influence of thread geometry and friction coefficient on the creep stress relaxation of bolts is studied. Considering the interface contact, an interface contact stiffness model is derived based on fractal theory. The dynamic equation of the bolted beam system is established using the Matrix27 stiffness matrix. The dynamic response of the bolted system, resulting from the degradation of interface stiffness due to bolt creep, is analyzed. The results show that the stress relaxation of bolt creep is not only related to creep parameters, but also related to the mate-thread interaction. The dynamic model with Matrix27 stiffness matrix is comparable to experiment in calculation accuracy and efficiency, which provides technical guidance for machine tool dynamics analysis and effectively solves the scientific problem of beam bolting performance degradation during the service of heavy-duty machine tools.

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来源期刊

Journal of Sound and Vibration 工程技术-工程：机械

CiteScore

9.10

自引率

10.60%

发文量

551

审稿时长

69 days

期刊介绍： The Journal of Sound and Vibration (JSV) is an independent journal devoted to the prompt publication of original papers, both theoretical and experimental, that provide new information on any aspect of sound or vibration. There is an emphasis on fundamental work that has potential for practical application. JSV was founded and operates on the premise that the subject of sound and vibration requires a journal that publishes papers of a high technical standard across the various subdisciplines, thus facilitating awareness of techniques and discoveries in one area that may be applicable in others.