Analytical and experimental study of translational vibration response’s reduction on aluminum (Al) drilling process using translational mass vibration absorber (TMVA) system

Abstract

The metal working is the main sector of the manufacturing industry. There are many types of machine tools used in the manufacturing industry, one of them are drilling machine. Every working machine will definitely produce the vibration. The vibration that comes from a working drilling machine can reduce the effectiveness of the machine and cause the damage of machine components. And eventually reduce company productivity. The vibration from the drilling machine can be overcome by using Dynamic Vibration Absorber (DVA). The main system of DVA is the mass of absorber and the spring. This study is about an experimental study of Translational Mass Vibration Absorber (TMVA) which is one of Dynamic Vibration Absorber (DVA) types. TMVA is designed to be able to reduce the vertical vibrations caused by the rotational speed of drilling machine. The drilling machine used is Kao Ming Machinery Industrial Co., Ltd type KMR-700DS. TMVA has only vertical direction movement. TMVA is designed in the cylindrical shells made of acrylic. The TMVA consists of the absorber mass and a spring. The main systems of the drilling machine which were being observed in this study were the workpieces and the drill bits. TMVA was only placed on the workpiece during the drilling process. There were 2 variations used, that were the drill size variations and the TMVA mass ratio. The experiment carried out in two different conditions, that were the main system without TMVA and the main system with TMVA. The results are about vibration acceleration response, percentage reduction, surface of the drilling material, and the accuracy level of the drilling diameter for each variation used. TMVA can reduce vibration at the rotational speed of 441 rpm and at the feeding speed of 0.07 mm/rev. Based on the experiment done, it can be concluded that the addition of 1/20 mass of absorber from the workpiece mass represented by 2 coins can effectively reduce the vibration in 12 mm drill size by 31.91%. TMVA also reduce the chatter effect and increase the accuracy level as indicated by the magnitude of the difference of drilling diameter without TMVA and with TMVA optimally at 0.15 mm.