Vibrational analysis of structure of gantry CNC milling machine using FEM

Meanwhile damages on machine, the created vibrations during the machining process will effect on the significant results of the process, such as surface finishing. Optimized design of the machine tool and high quality of the workpiece would be possible by determining the vibration characteristics of machine structure. In this paper, transient and harmonic dynamic behavior of gantry CNC milling machine (DMC 1000) has been studied. For this reason, rudimentary structure of the machine and its main complex are modeled in the commercial Solidworks software. Then, the natural frequency and dynamic response are evaluated in both transient and harmonic moods using ABAQUS. Finally, the stability condition is investigated for the current machine. Results showed that the system response is more sensitive under frequency of 400 Hz and the largest displacement occurs at >irst locating position of spindle.