基于机载测头的机床热误差在线识别方法研究

New Method for Indentifying Machine Thermal Error On-line Based on Probe

针对当前机床热误差在线检测识别困难的问题,提出一种机床测头在线测量热误差的方法。该方法可在不求解几何误差的情况下,利用组合球阵球心热变形前后的坐标值构成空间向量,通过该向量求解坐标变换关系识别和辨识热误差。最后,在三轴加工中心上进行测量和试验验证。试验证明,该方法能够快速地在线识别和检测热误差值,为热误差的补偿提供了先决条件。

In this paper,a new method is proposed using reconfigurable uncalibrated master ball artefact（ RUMBA）and on machining measurement probe to measure and identify the thermal error rapidly on- line. Using machine probe measure the vector values before and after the thermal deformation composed of three RUMBA,establishment of a comprehensive error identification model includes geometric and thermal error,utilizing multi- viewpoint modeling method based on stereo vision to direct solution of thermal deformation error without geometric error influence,Experiments show that the method can fast on- line identification and testing the thermal error values.