Effect of clamping conditions on the vibrational behavior of a designed-in-damped turning tool

Sammanfattning: Clamping conditions of a boring bar with designed in damping were altered and the effect of the alterations on the dynamic properties of the boring bar was studied. Three types of mechanisms each one having a VDI-turret-interface (Verein Deutscher Ingenieure, the Association of German Engineers) were studied. Two of the mechanisms provided hydrostatic clamping of the bar (Hydro-grip and Hydrofix) and the third was a screw clamping mechanism. Testing was made through modal analysis and machining tests which suggested that a hydrostatic clamping of the damped boring bar was optimal over screw clamping. The optimal hydrostatic clamping mechanism was found to be the Hydro-grip. The clamping torque of the Hydro-grip could be adjusted from 6 Nm to 4 Nm to reduce vibrations when machining.