The Effect of Adding Cone Rubber-Mass Dynamic Vibration Absorber to Boring Bar on Reduction of Vibration Response in Machinery Process (Lathe Machine)

This chapter investigates the integration of a Dynamic Vibration Absorber (DVA) into boring bars to mitigate vibrations during machining processes. The study focuses on a novel cone-shaped DVA design, which is placed in a cavity within the boring bar. The cone shape is chosen for its ability to distribute stress in all directions, effectively dampening vibrations from forces in the axial, tangential, and radial directions. The research varies the type of rubber used in the DVA and the length-to-diameter (L/D) ratio of the boring bars, as well as cutting parameters such as feed rate, depth of cut, and spindle rotation speed. Simulation results using ANSYS show that the customized boring bar with DVA exhibits two natural frequency peaks, with the first peak being higher than the second. The study finds that natural rubber outperforms neoprene rubber in reducing vibration response, and that increasing the L/D ratio decreases the natural frequency, making resonance conditions occur more quickly. The cone-shaped DVA design is shown to reduce vibrations optimally on all three axes, with the highest vibration response reduction achieved with a customized boring bar of L/D ratio 9 using natural rubber and specific cutting parameters. The chapter provides a detailed analysis of the percentage reduction in vibration response for each variation, highlighting the effectiveness of the DVA in improving the quality and performance of the boring process.