关键词: 递推算法, 热误差, 数控机床, 在线建模

Abstract: An on-line modified or modeling method of thermal error compensation model for CNC machines is presented. The resulting model is not a fixed formular, but an algorithm consisting of some simple recursive equations. The thermal error compensation model is modified recursively according to new input data. Since the recursive algorithm no longer uses the former data，the process is very rapid and simple. The result of proposed modeling method indicates that it can highly improve the robustness，versatility and precision of the thermal error compensation model.

Key words: CNC Machine, On-line modeling, Recursive algorithm, Thermal error