Effect of cryogenic cooling on milling vibration of thin-walled titanium alloy parts
摘要
In order to solve the vibration problem caused by high-speed milling of thin-walled titanium alloy parts, an analysis model of workpiece amplitude based on cryogenic influence was established. A series of machining tests, including flood and liquid nitrogen (LN2), were carried out on thin-walled titanium alloy parts, and the influence rule of cryogenic temperature on the machining vibration was analyzed. The results show that compared with the flood cooling strategy, the amplitude of the milling system is reduced, and the cutting vibration is improved significantly at cryogenic cooling. Similarly, it is more than 52.5 mm/s2 at flood cooling, but only about 35 m/s2 for LN2 cooling of − 190 °C. The action time of the tool and chip is reduced because of the brittle chip breaking. Meanwhile, the acceleration at the cutting point is significantly reduced at the cryogenic cooling strategy, especially at high speed and high cutting depth. Furthermore, at cryogenic cooling, the increase of cutting stiffness, the decrease of amplitude, brittle chip breaking, and grain thinning are the main reasons for the improvement of vibration defects in thin-walled parts milling.