Analysis of dynamic characteristics of heavy-duty gantry machine tool in bolt loosening

IF 3.5 2区工程技术 Q2 ENGINEERING, MANUFACTURING

Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology Pub Date : 2025-03-18 DOI:10.1016/j.precisioneng.2025.03.015

Zhifeng Liu , Yiming Wu , Tao Zhang , Congbin Yang , Ying Li , Jingjing Xu

{"title":"Analysis of dynamic characteristics of heavy-duty gantry machine tool in bolt loosening","authors":"Zhifeng Liu , Yiming Wu , Tao Zhang , Congbin Yang , Ying Li , Jingjing Xu","doi":"10.1016/j.precisioneng.2025.03.015","DOIUrl":null,"url":null,"abstract":"<div><div>There are many bolted structures in heavy-duty gantry machine tools, and the structural performance of these components greatly impacts the dynamic properties of the entire machine. Firstly, based on the fractal theory, a bolt preload-contact stiffness and damping model was established by characterizing the load, deformation and strain energies of the bolted joint surfaces. In order to precisely forecast the dynamic features, a dynamic response model of the tip point of the gantry machine was first proposed by adopting the multi-body system transfer matrix method. The feasibility of the contact mechanism and the dynamic response model were verified by modal tests respectively. Finally, the effect of bolt preload loosening on the dynamic response of the whole machine is analyzed. In the scaled model of the gantry machine, when the bolt preloads on the lathe bed-column and crossing beam-column joint surfaces are loosened by 30 %, the displacement response of the tool tip point increases by 41.2 % and 40.1 % respectively, which indicates that the effect of lathe bed-column interface is more significant. This paper seeks out the weak link in the gantry machine tool, which helps to carry out the design optimization of its assembly processing afterward.</div></div>","PeriodicalId":54589,"journal":{"name":"Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology","volume":"94 ","pages":"Pages 486-504"},"PeriodicalIF":3.5000,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0141635925000881","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, MANUFACTURING","Score":null,"Total":0}

引用次数: 0

Abstract

There are many bolted structures in heavy-duty gantry machine tools, and the structural performance of these components greatly impacts the dynamic properties of the entire machine. Firstly, based on the fractal theory, a bolt preload-contact stiffness and damping model was established by characterizing the load, deformation and strain energies of the bolted joint surfaces. In order to precisely forecast the dynamic features, a dynamic response model of the tip point of the gantry machine was first proposed by adopting the multi-body system transfer matrix method. The feasibility of the contact mechanism and the dynamic response model were verified by modal tests respectively. Finally, the effect of bolt preload loosening on the dynamic response of the whole machine is analyzed. In the scaled model of the gantry machine, when the bolt preloads on the lathe bed-column and crossing beam-column joint surfaces are loosened by 30 %, the displacement response of the tool tip point increases by 41.2 % and 40.1 % respectively, which indicates that the effect of lathe bed-column interface is more significant. This paper seeks out the weak link in the gantry machine tool, which helps to carry out the design optimization of its assembly processing afterward.

查看原文本刊更多论文

重型龙门机床螺栓松动动态特性分析

重型龙门机床中有许多螺栓结构，这些部件的结构性能对整机的动态性能影响很大。首先，基于分形理论，通过表征螺栓连接面荷载、变形能和应变能，建立了螺栓预紧力-接触刚度和阻尼模型；为了准确预测龙门机的动态特性，采用多体系统传递矩阵法，首次建立了龙门机尖端的动态响应模型。通过模态试验验证了接触机理和动态响应模型的可行性。最后，分析了螺栓预紧松动对整机动态响应的影响。在龙门机床的比例模型中，当床柱和交叉梁柱结合面上的螺栓预紧力松动30%时，刀尖点的位移响应分别增加41.2%和40.1%，表明床柱界面的影响更为显著。本文找出了龙门机床的薄弱环节，有助于后续对其装配工艺进行设计优化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Precision Engineering-Journal of the International Societies for Precision Engineering and Nanotechnology 工程技术-工程：制造

CiteScore

7.40

自引率

5.60%

发文量

177

审稿时长

46 days

期刊介绍： Precision Engineering - Journal of the International Societies for Precision Engineering and Nanotechnology is devoted to the multidisciplinary study and practice of high accuracy engineering, metrology, and manufacturing. The journal takes an integrated approach to all subjects related to research, design, manufacture, performance validation, and application of high precision machines, instruments, and components, including fundamental and applied research and development in manufacturing processes, fabrication technology, and advanced measurement science. The scope includes precision-engineered systems and supporting metrology over the full range of length scales, from atom-based nanotechnology and advanced lithographic technology to large-scale systems, including optical and radio telescopes and macrometrology.