Ltrasonic Rolling Mechanism And Flutter Analysis

The surface quality of mechanical processing has a great influence on the wear resistance,fatigue resistance and corrosion resistance of parts,therefore improving the surface quality of parts is an important work in machining process.As a new method of surface strengthening,ultrasonic rolling technology has been widely developed in the field of machinery,it has a series of advantages,such as small elastic pressure,small friction,smooth surface material and high wear resistance.Firstly,the selection and design of equipment in ultrasonic rolling device are described,the horn is an important part of ultrasonic vibration system,and the selection and design are analyzed in detail.The vibration of the ultrasonic rolling process is analyzed,the regenerative chatter is an important factor affecting the rolling process,which seriously affects the rolling precision and the surface performance of the workpiece.Based on the linear theory,a single degree of freedom mechanical model of ultrasonic rolling processing system is established,and the critical state of flutter is obtained by analyzing and deriving the stability.The stability lobe diagram of the ultrasonic flutter system is obtained by MATLAB simulation,and the influence of the overlapping coefficient,the equivalent stiffness,the damping coefficient and the different dynamic parameters of the natural frequency on the stability of the flutter is simulated and analyzed.Using Simulink toolbox to simulate the time domain chart of different rolling width,the critical limit state of flutter of vibration system is obtained.The parts are processed by different overlapping coefficients,spindle speed and rolling times,and the surface properties are measured,the effects of different factors on the surface properties of the materials are analyzed by using the roughness tester and the sclerometer.Aiming at the mechanism of chatter generation,measures to suppress and eliminate chatter are sought,which provides a fine theoretical basis for improving the surface properties of processed materials in the future.Finally,based on the Hertz theory,theoretical mechanics and contact mechanics are used to explore the elastic-plastic deformation of the parts,and analyze the residual stress of the material and its effect on the fatigue life of the material.The ANSYS software is used to simulate the ultrasonic rolling process,and the stress-strain state of the elastic-plastic deformation of the parts is obtained,which provides a good idea for further research on ultrasonic rolling process.