Research On Ultrasonic Vibration Aided Drilling High Manganese Steel Processing Mechanism

With the rapid development of science and technology,the use of more and more materials of difficult to machining make processing requirements are getting higher and higher.When processing difficult materials traditional ordinary drilling processing will cause various problems:low precision drilling,wrapping,poor chip evacuation,serious bit wear and tear even broken.the traditional ordinary drilling processing cannot meet the requirements,be badly in need of a new efficient way of processing.Ultrasonic vibration drilling processing methods came into being,the ultrasonic vibration drilling is based on the traditional the rotation of the drilling process is a combination of axial ultrasonic vibration technology formed by the new processing technology,which essentially changes the drilling mechanism,the traditional drilling process of continuous processing into a periodic pulse processing,has the traditional drilling incomparable processing effect.Based on the thought of realizing axial ultrasonic vibration drilling on Vertical boring and milling machine,this paper starts from the basic principle and processing mechanism of ultrasonic vibration drilling,and discusses the processing system,theoretical research and drilling experiment of axial ultrasonic vibration drilling In.depth study of the processing characteristics of axial ultrasonic vibration drilling.The main research contents are as follows:(1)The research background and significance of ultrasonic vibration drilling and its research status at home and abroad are analyzed.The machining characteristics,applicable scope,existing problems and development trends of ultrasonic vibration drilling are analyzed and researched.(2)The kinematics of ultrasonic vibration drilling is analyzed.The equation of motion of vibration drilling is established,and its kinematics characteristics are analyzed from three aspects:variable-speed cutting characteristics,angle-changing cutting characteristics and thickening cutting characteristics of ultrasonic vibration drilling.(3)The chip breaking mechanism of ultrasonic vibration drilling is analyzed and the condition of complete geometric chip breaking.From the perspective of geometrical chip breaking,the complete geometrical chip breaking of ultrasonic vibration drilling is theoretically studied.The conditions of complete geometric chip breaking are obtained by calculating the chip thickness,and the theoretical area map of complete geometric chip breaking is drawn.The chip removal force analysis was carried out,and the mathematical model of chip removal force was established.The simulation three-dimensional curve of chip removal force was drawn by MATLAB,and the variation law of chip removal force with amplitude and frequency was obtained.At the same time,the friction reduction mechanism of ultrasonic vibration drilling is analyzed,and it is concluded that the increase of friction force with amplitude increases first and then becomes larger.(4)Ultrasonic steel drilling experiments were carried out on high-manganese steel using its own ultrasonic vibration drilling system.The experimentally generated chips verify that the conditions of the complete geometric chip breaking are correct;the quality of the ultrasonic vibration drilling is higher than that of the ordinary drilling by the comparison of the presence or absence of ultrasound,and the spindle speed is obtained by a single factor experiment.The influence of feed rate and ultrasonic amplitude on axial drilling force and surface quality.Through the orthogonal experiment method,the effects of feed rate fr,amplitude A and speed n on axial force are comprehensively analyzed,and various factors are finally determined..