Abstract
In the processing of titanium alloys, it is necessary to reduce the depth of cut to suppress chatter vibration, and the material removal rate decreases. We developed a variable preload spindle that can improve the rigidity by changing the preload force, such that the cutting depth can be maintained without causing chatter vibration. Here, static stiffness test, impact vibration test and machining test were performed to evaluate the performance of the developed spindle. The results confirmed that static stiffness value was improved by 38% and compliance value in impact vibration test was reduced by approximately 50%, compared with the fixed-position preload spindle. In machining test, the vibration acceleration during machining was suppressed, and therefore the validity of the developed spindle was confirmed.
