Intelligent Compensation of Thermal Coupling Deformation for Tool Center Point using Chromatic Confocal Displacement Sensor

Thermal deformation via the temperature change is the most significant factor influencing the machine tools’ precision accuracy. Among the thermal deformation, the spindle deformation has the most severe effect on the tool center point (TCP), followed by deformation of linear movement. Hence, this study proposes a method that combined the chromatic confocal displacement sensor and an artificial neural network to compensate thermal deformation of TCP via coupling the influence of linear axis movement and spindle rotation. The results show that the proposed method can effectively restrain the thermal deformation of TCP within the range of 4um during machining.