摘要
五轴数控机床的几何误差和热误差是影响工件加工精度的两个重要因素,对这些误差因素进行分析可以有效提高薄壁件工件的加工精度。本文首先基于齐次坐标变换法,建立了双转台五轴数控机床的旋转轴几何误差模型;然后基于对标准球进行在机接触测量,辩识得出两旋转轴的12项几何误差,这些误差考虑了两旋转轴之间的相互影响和其热误差的影响;最后分析五轴数控机床加工空间的几何误差场,在该加工空间内几何误差从中心到外侧逐渐增加,当A轴旋转角度增加时,误差的最大值也随之增加。与其它位置误差辨识方法相比,本方法的测量精度符合加工要求,测量时间只需要30 min。
Geometric error and thermal error of the five-axis CNC machine tool are two important factors that affect the machining accuracy of workpiece.The analysis of these error factors can effectively improve the machining accuracy of thin-walled workpiece.Firstly,based on the homogeneous coordinate transformation method,the geometric error model of rotating axis of five-axis CNC machine tool with double turntable is formulated.Then,on the basis of standard ball,the machine contact measurement is carried out.Twelve geometric errors of the two rotating axles are identified.These errors consider the mutual influence between the two rotating axles and the influence of thermal error.Finally,the geometric error field in the machining space of five-axis CNC machine tool is analyzed.In this machining space,the geometric error gradually increases from the center to the outside.When the rotation angle of axle increases,the maximum error also increases.Compared with other position error identification methods,the measurement accuracy of the proposed method meets the processing requirements.The measurement time only needs 30 min.
作者
吴石
樊正东
刘献礼
李传东
王春风
Wu Shi;Fan Zhengdong;Liu Xianli;Li Chuandong;Wang Chunfeng(Key Laboratory of Advanced Manufacturing Intelligent Technology of Ministry of Education,Harbin University of Science and Technology,Harbin 150080,China)
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2021年第5期66-78,共13页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(51720105009,51675146)项目资助。
关键词
五轴数控机床
双旋转轴
几何误差
热误差
空间误差场
five-axis CNC machine tool
dual-rotation axis
geometric error
thermal error
spatial error field
作者简介
通信作者:吴石,2010年毕业于白俄罗斯国立大学,获博士学位,现为哈尔滨理工大学教授,主要研究方向是机械动力学、在机测量等。E-mail:wushi971819@163.com;樊正东,2019年毕业于安徽农业大学,获学士学位,现为哈尔滨理工大学硕士研究生,主要研究方向是机床误差、变速器结构等。E-mail:fzd1778417460@163.com。
