基于元动作模块的多轴数控机床精度分析

Accuracy Analysis of Multi-axis CNC Machine Tools Based on Meta-action Module

为充分发挥多轴数控机床大数据的价值,降低运动精度的预测难度,提出了基于元动作模块的精度分析方法。采用多体模型描述机床运动系统的结构和运动关系,利用旋量理论和微分方法推导了用于运动精度评价的坐标误差模型;规划了多轴数控机床大数据驱动的精度分析的结构框架,并重点论述了以元动作模块为基本组成单元的分布式元动作数据库的构建方法,该方法充分发挥历史大数据和实时动态数据的价值,保证了机床运动系统的仿真和精度预测的稳定性与准确性。通过对五轴联动加工中心的刀具运动系统的实例分析,验证了精度分析方法的简便性和适用性。

In order to give full play to the value of big data of multi-axis CNC machine tools and reduce the difficulty of the motion accuracy prediction,an accurace research method was proposed based on meta-action module.A multi-body model was used to describe the structures and motion relationships of machine tools'motion systems.The coordinate error model for motion accuracy evaluation was deduced by screw theory and differential method.The structure framework of accuracy analysis was planned for multi-axis CNC machine tools driven by big data,and the method of constructing distributed meta-action database was emphatically discussed based on meta-action module.The value of historical big data and real-time dynamic data were brought into full play to ensure the stability and accuracy of simulation and accurace prediction of motion systems.The experiments were performed on the tool motion systems of CNC 5-axis machining center which verified the simplicity and applicability of the accuracy analysis method.