研究了基于多体系统理论的数控机床加工工件表面建模和加工精度预测建模的机理,基于虚拟加工技术,开发出了数控机床加工精度软件预测系统.最后,为了验证开发的精度预测系统的有效性,在对包括几何误差、热变形误差和力变形误差在内的机床综合误差进行检测和辨识的基础上,进行了加工精度预测仿真. Based on the multi-body system theory, the mechanism of CNC machining surface modeling and machining accuracy prediction modeling is developed. Based on the virtual machining technology, a software prediction system for CNC machining accuracy is developed. Finally, in order to verify the accuracy of the developed prediction system The accuracy of the machine tool is tested and identified based on the comprehensive error of the machine tool including geometric error, thermal deformation error and force distortion error.