多轴数控机床转台几何误差辨识新方法

发布时间：2019-04-28 10:16

【摘要】：为了系统地辨识多轴数控机床转台的10项几何误差,提出一种基于球杆仪测量的转台几何误差六步骤测量法.根据球杆仪方向向量并结合六步骤中各个步骤球杆仪位置得到球杆仪读数与转台几何误差项之间的模型.根据几何误差项的性质,辨识得到包括垂直度误差和位置误差的10项几何误差.仿真结果验证六步骤测量法的正确性.为了提高辨识精度,分析球杆仪安装误差对各个步骤中球杆仪读数的影响,采用最小二乘法拟合得到消除安装误差后的球杆仪读数.采用六步骤测量法辨识SmartCNC500五轴机床转台几何误差,对这些误差进行补偿后比较补偿前后球杆仪读数,补偿后球杆仪读数误差,误差降低了56%~61.9%,结果表明六步骤测量法精度高,只需转台旋转,且运动易实现,球杆仪安装方便.
[Abstract]:In order to systematically identify the 10 geometric errors of the turntable of multi-axis NC machine tool, a six-step measuring method based on spherical bar measurement is proposed. According to the direction vector of the spherometer and the position of the spherometer in the six steps, the model between the reading of the spherometer and the geometric error term of the turntable is obtained. According to the properties of geometric error terms, 10 geometric errors including verticality error and position error are identified. The simulation results verify the correctness of the six-step measurement method. In order to improve the identification accuracy, the influence of the installation error of the ball bar instrument on the reading of the ball rod instrument in each step is analyzed. The least square fitting is used to get the ball rod instrument reading after the installation error is eliminated. The geometric errors of the rotating table of SmartCNC500 five-axis machine tool are identified by six-step measurement method. After compensating these errors, the ball rod reading before and after compensation is compared, and the error is reduced by 56% ~ 61.9% after compensating the ball rod instrument reading error, and the error is reduced by 56% ~ 61.9%. The results show that the six-step measurement method has high precision, only needs rotation of the turntable, and the movement is easy to realize, and the installation of the ballbar instrument is convenient.
【作者单位】：浙江工业职业技术学院;浙江大学机械工程学院;
【基金】：国家自然科学基金资助项目(51175461) 浙江省自然科学基金资助项目(Y14E050069) 中央高校基本科研业务费专项资金资助项目(2014QNA4004)
【分类号】：TG659

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