基于LabVIEW的数控机床形位误差精密测量系统

Geometry and position error measuring system of CNC machines based on LabVIEW

为了实现对数控机床形位误差精密测量,采用扭簧表及大理石平尺搭建导轨直线度测量装置,以HEIDENHAIN绝对式直线光栅尺为定位精度测量硬件,PC端通过数据采集卡获取测量信息,并基于LabVIEW开发虚拟仪器,实现了对数控机床导轨直线度、定位精度和重复定位精度项目的测量;提出了一种基于LabVIEW平台构建数控机床形位误差测量系统的新方案。在相同的检测参数下,对同一台数控机床进行检测,并与激光干涉仪测量的数据比对,激光干涉仪采用GB/T17421.2-2000统计分析方法,实验结果表明,本系统具备较高的测量分辨率和测量精度。

To achieve the precision measurement of form and position errors of NC,torsion spring and marble leveling rule were applied in measuring the straightness of the guide way,and the grating scale of HEIDENHAIN were adopted for position error measuring.The virtual instrument based on LabVIEW were developed for further processing,to which the measuring datas were collected through data acquisition card.A geometry and position error measuring system of CNC machines based on LabVIEW was proposed.The system was capable in measuring the straightness of guide way,the position precision and repetitive position precision.Under the same parameter value,the result compare to the data of the measurement with laser interferometer,which adopt the way of statistical analysis in GB/T17421.2-2000.Experiment results show that it is available with high precision and high resolution.