Based on the time-varying characteristics of the error components, a comprehensive error modeling method for a B-A swiveling head 5-axis machine tool is proposed. First, the dynamic error components are expressed as the Fourier series that are associated with the speed and the acceleration of the moving platform. Then, joint error transformation matrixes are modeled as the synthesis of the static and dynamic error transformation matrixes. Subsequently, the error mapping between the trajectory errors of the cutting tool and the joint error sources are constructed based on the MBS method. Finally, a theoretical analysis is made and the results show that both the kinematic and dynamic accuracy impacting factors are considered in this method, which can reflect the machining errors of the machine tools more accurately and also provide a solid foundation for the error compensation and the control parameter modulation.

numerical control machine tool  /  error modeling  /  dynamic error  /  error compensation  /  control parameter modulation