Determining the Dynamic Properties of a Cutting Machine Tool Ram

摘要

This work aims to determine the main dynamic properties of a cast ram in order to create correct modal numerical simulation in FEM software. The dynamic stability of machine tools is directly dependent on natural frequencies and their waveforms and it has large impact on the accuracy of machine tools during the cutting process. Therefore, determining main dynamic properties (vibrations - natural frequencies and their waveforms) is very important. The numerical simulation was done in Siemens Simcenter software with NX Nastran solver. Simulation was carried out as a free state solution. Experimental measurement was done to verify the calculated data. Experimental measurement was performed using the impulse excitation method with a modal sledge hammer. As well as the modal sledge hammer, we used a triaxial accelerometer and a generator module. Subsequently, the experimental modal analysis was done in PULSE19 software. Comparison of results was performed after measuring. Certain agreement was found between the experimentally measured data and data form numerical simulation.