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Effect of Working Position on Vertical Motion Straightness of Open Hydrostatic Guideways in Grinding Machine

查看全文 作　　者：ZHA [1]JUn;WANG [2]Zhiwei;XUE [1]Fei;CHEN [1]Yaolong 高影响力作者 机构地区：[1]State Key Laboratory for Manufacturing Systems Engineering, Xi 'an Jiaotong University, Xi 'an 710049, China;[2]College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China高影响力机构 出　　处：《Chinese Journal of Mechanical Engineering》索引2017年第30卷第1期,共7页高影响力期刊 基　　金：Supported by National Natural Science Foundation of China(Grant No.51275395);National Science and Technology Major Project of Ministry of Science and Technology of China(Grant No.2012ZX04002–091);the Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents,China(Grant No.2014RCJJ022) 摘　　要：Hydrostatic guideways have various applications in precision machine tools due to their high motion accuracy. The analysis of motion straightness in hydrostatic guideways is generally ignoring the external load on the slider. A variation force also exists, caused by the different working positions, together with the dead load of the slider and that of other auxiliary devices. The effect of working position on vertical motion straightness is investigated based on the equivalent static model, considering the error averaging effort of pressured oil film in open hydrostatic guideways. Open hydrostatic guideways in LGF1000 are analyzed with this approach. The theoretical results show that the slider has maximum vertical motion straightness when the working position is closer the guiderail of Y axis. The vertical motion straightness reaches a minimum value as the working position is located at the center of the two guiderails on the Y axis. The difference between the maximum and minimum vertical motion straightness is 34.7%. The smaller vertical motion straightness is attributed to the smaller spacing of the two pads centers, along the Y direction. The experimental results show that the vertical motion straightness is 4.15 μm/1200 mm, when the working position is located in the middle of the X beam, and 5.08 μm/1200 mm, when the working position is approaching the Y guiderails, denoting an increase of 18.3%. The changing trends of the measured results validate the correctness of the theoretical model. The research work can be used to reveal the variation law of accuracy of the open hydrostatic guideways, under different working positions, to predict the machining precision, and provides the basis for an error compensation strategy for gantry type grinding machines. 关 键 词：垂直运动 工作位置 静压导轨 直线度 开放式 研磨机 误差平均效应 静态模型
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