Research on NC Machine Tool Dynamic Characteristic Considering Processing Dynamics

A method for the machine tool dynamic characteristic modeling and simulation is further presented. This method takes structure and processing dynamics into account, after the structural dynamic characteristic of the machine tool has been studied. A certain gantry-type machining center is used as a research object. First, the structural dynamic model based on finite element analysis (FEA) is built. Through analyzing mode shape and harmonic results, the weakness of the machine tool structure is found out. Simultaneously, the structural dynamics and processing dynamics of the machine tool are combined, and the "machine tool-cutter\´ coupled model is constructed based on the receptance coupling substructure analysis method. Finally, the machine tool dynamic characteristic with given cutting parameters is analyzed, thus, the cutting performance of the machine tool is predicted.