Study On The Acoustic System And The Stability Of Titanium Alloy By Ultrasonic Vibration Milling

With the need increase of advanced technology field such as aerospace for material of difficult machining such as titanium alloy,the traditional machining methods are more and more limitations,so the choice of machining methods for difficult materials is becoming more and more important.Ultrasonic vibration milling is a kind of precision and ultraprecision machining method,the separated ultrasonic vibration machining can reduce the cutting force,but the research of the unseparated ultrasonic vibration machining on the cutting force and the stability of the milling process is not very deep.Therefore,in this paper,the unseparated one-dimensional ultrasonic vibration along the feed direction of the cutting tool and unseparated two-dimensional unseparated ultrasonic vibration in the vertical plane were researched.The main contents of this paper are as follows:In this paper,an example is given to analyze the kinematics of unseparated one-dimensional ultrasonic vibration milling along the feed direction of the cutting tool.The dynamic models of unseparated one-dimensional ultrasonic vibration milling along the tool feed direction and vertical tool feed direction are established and the dynamic model of unseparated two-dimensional ultrasonic vibration milling in the vertical plane is established.The semi-discrete method and the full discretization method are used to establish the ultrasonic vibration milling system stability model.The numerical analysis was carried out by using Matlab software,and the stability lobe diagram of the milling system was obtained.Ultrasonic machining device is used to verify the stability of ultrasonic vibration processing radio energy transmission system.The stability models of two dimensional unseparated ultrasonic vibration milling in vertical plane and unseparated one dimensional ultrasonic vibration milling in the direction of tool feed were validated.A case study of two dimensional unseparated ultrasonic vibration milling of titanium alloy in vertical plane,whether the common milling stability can be increased from the point of view of two dimensional unseparated ultrasonic vibration milling in vertical plane force and roughness.The research shows that the stability of machining system could be improved about 15% by the unseparated one-dimensional ultrasonic vibration along feed direction milling system and the two-dimensional unseparated ultrasonic vibration in vertical plane milling system,and the stability of the unseparated one-dimensional ultrasonic vibration in vertical feed direction milling system was worse the other through simulation analysis on the stability of the ultrasonic vibration milling system by using Matlab software.The correctness of the stability models of the unseparated one-dimensional ultrasonic vibration milling along the feed direction and the two dimensional unseparated ultrasonic vibration in vertical plane by milling the titanium alloy were verified.The acoustic system is stable in ultrasonic vibration machining device.The correctness of the stability models are verified by unseparated one dimension ultrasonic vibration milling of titanium alloy and two-dimensional unseparated ultrasonic vibration milling of titanium alloy in the vertical plane;From the view of milling force,the two dimensional unseparated ultrasonic vibration milling in the vertical plane can be verified to improve the stability of common milling,however,the stability of the common milling can not be improved from the roughness angleby the two-dimensional ultrasonic vibration milling in the vertical plane.