ANALISA PERILAKU DINAMIK MESIN DRILL AKIBAT MASS UNBALANCE DENGAN MENGGUNAKAN FINITE ELEMENT METHODE (FEM)

Abstract

Drilling machine is one of the most important machine tools in industry except lathe and frais machine. Drilling machine has an important role on production proceses. But, vibration while drilling operation that caused by chatter or machine faults made the product output failure. One of the machine faults types is mass unbalance that can reduce the quality of product geometry. Therefore, dynamic behaviour analyze is necessary to prevent this mass unbalance will not happen. So, we did the dynamic behaviour analyze of drilling machine used ANSYS 11.0 Workbench. The aim of this research is to find out the natural frequency and the mode shape of drilling machine, could to display their mode shape deformation with damping caused by excitation forces 100 N, and could to display FRF and FFT graphics caused by mass unbalance. In order to achieve the aims, modal analysis method has been adopted. Here, principal structures and their material which influence the stiffness of the drilling machine were modeled used SolidWork 2007 software. The drilling machine were modeled in three configuration of head body position. Software ANSYS 11.0 Workbench used to determine FRF. As the results, the different configuration of head body position has been influence the dynamic behaviour structure that can be signed with the different of natural frequency. More higher the natural frequency, more higher the stiffness and it’s allow the structure difficult to vibrate. From the FRF, we know that the increase operation rotation of drilling machine allow higher vibration velocity that caused by mass unbalance.