基于最小二乘法的电主轴回转精度评价  

Rotation accuracy evaluation of electric spindle based on least square method

作　　者：王立平[1] 张彬彬[1] 吴军[1] WANG Liping;ZHANG Binbin;WU Jun(Department of Mechanical Engineering,Tsinghua University, Beijing 100084, CHN)

机构地区：[1]清华大学机械工程系,北京100084

出　　处：《制造技术与机床》2018年第2期54-60,共7页Manufacturing Technology & Machine Tool

基　　金：国家科技重大专项高档数控机床与基础制造装备专项:数控机床可靠性快速试验技术研究及应用(2016ZX04004-004)

摘　　要：以应用于五轴加工中心上的高速电主轴为研究对象,研究基于最小二乘法的电主轴回转精度评价。首先建立电主轴回转误差模型,对电主轴的常量信号、偏心信号等相关信号进行研究和分离。针对电主轴回转精度的最小二乘法评定方法,分析对比了最小二乘牛顿迭代算法、最小二乘近似算法和平均值算法。基于标准球、高精密电容位移传感器等组成的测量系统,采集电主轴高速转动下的径向跳动信号,并分别采用3种算法对信号进行处理与分析,验证了3种算法的有效性。最后在分析对比3种算法结果后,设计了不同应用背景下的电主轴回转精度评价策略,并提出了一种兼顾计算精度和计算效率的电主轴回转精度快速评价算法。In this paper, an evaluation strategy of rotation accuracy of electric spindle based on least square method is investigated. Firstly, the model of rotation error of the spindle is established. Based on the error mod- el, the constant signals, eccentric signals of the spindle are studied and separated. According to the least square method evaluating the rotation precision of the spindle, the least squares Newton iterative algorithm, the least square approximation algorithm and the average algorithm are analyzed and compared. After the radial runout signals are collected by using measurement system, the three algorithms are used to process and analyze the signals respectively. Based on the results of the three methods, a strategy to evaluate the precision of the spindle is presented, and an evaluation algorithm considering calculation precision and efficiency is also proposed.

关 键 词：电主轴 回转精度 最小二乘圆 牛顿迭代法 

分 类 号：TH161.21[机械工程—机械制造及自动化]