Modeling and analysis of boring bar vibration response in internal turning due to variation of the amount of DVA rubber in finish boring cut

In boring processes, excessive vibration often occur due to low tool stiffness. To solve this problem, a mechanical vibration suppression called dynamic vibration absorber (DVA) is used. DVA is located on the edge of the customized boring bar overhang with diameter reduction. The absorber mass is designed in the form of a thin steel tube and the absorber stiffness is made from natural rubber. By varying the number of rubbers, the different natural frequencies of DVA to accommodate different excitation can be achieved. Boring bar has a 25 mm diameter with a length-to-diameter (L/D) ratio overhang equal to 8. 27 cutting parameters are carried with variations in cutting speed, depth of cut, and feed rate which affect machining forces and chatter frequency. The simulations show that customized boring bar design with DVA can remain stable in larger forces and chatter frequency with higher material removal rate.