The Design And Experimental Study Of Single-excited Ultrasonic Elliptical Vibration Rolling Device

The Mechanical parts often fail prematurely due to surface fatigue,wear and corrosion.In high-tech fields such as aviation,aerospace,defense,ocean engineering,transportation engineering,etc.,the performance of mechanical components is extremely demanding,and a good finish is required to increase the mating accuracy,and a good surface corrosion resistance,wear resistance,and fatigue resistance are pursued strength.Rolling technology can effectively improve the surface’s overall quality,fatigue strength,wear resistance and corrosion resistance of mechanical components.However,it has the limitations of excessive rolling pressure,short tool life,vulnerability to damage,and low processing efficiency.In addition,the hardened layer formed on the surface of the workpiece is layered and easily falls off.The introduction of high frequency ultrasonic vibration into rolling technology,namely ultrasonic rolling technology,can effectively avoid the limitations of traditional rolling processing and solve the stratification phenomenon of the hardened layer,and can obtain better processing results and processing.Accuracy,and two-dimensional ultrasonic rolling processing has better machining effects and machining accuracy than one-dimensional ultrasonic rolling.In this paper,the single-excited ultrasonic elliptical vibratory rolling device is designed.The PZFlex finite element software is used to analyze the transient response of the single-excited ultrasonic elliptical vibrator.The ultrasonic rolling device is used to build the ultrasonic rolling processing system,and the system is used to perform ultrasound.Rolling test.This article mainly completes the following work:(1)Based on the design theory of transducers and conical horns,quarter-wavelength transducers and asymmetrical quarter-wavelength horns are designed to manufacture and assemble ultrasonic elliptical vibrators.The resonant frequency of the ultrasonic oscillator and the amplitude displacement of the vibrator end surface were measured with a frequency characteristic analyzer and a Doppler laser vibrometer.The mechanism of the elliptical vibration generated by the asymmetric structure horn was analyzed.The factors affecting the transverse amplitude of the asymmetric structure ultrasonic transducer were analyzed by PZFlex.The results show that the transverse amplitude of the ultrasonic vibrator increases with the spacing of keyway,the depth of keyway and the radius of the keyway.(2)The PZFlex is used to analyze the transient response and steady-state response of the ultrasonic oscillator.The amplitude-frequency characteristic curve and impedance characteristic curve are obtained by the post-processor.The resonance frequency of the ultrasonic ellipsoidal vibrator is analyzed,and the amplitude of the vibrator is analyzed by the displacement time-domain results.The resonance frequency obtained by the finite element analysis is 20.226 kHz,and the error at the design frequency of 20 kHz is within a reasonable range,and the lateral amplitude and longitudinal amplitude are 3 um and 11.7 um.The trajectory of the end face of the ultrasonic ellipsoidal vibrator was verified as an elliptical trajectory.(3)a rolling tool head and clamping device were designed,and the ultrasonic rolling system was set up.The performance of the ultrasonic rolling system was tested,and the results showed that the system met the requirements of ultrasonic rolling.The application of ultrasonic system rolling rolling experiment of Aluminum Alloy rod,the results show that the rolling effect of ultrasonic elliptical vibration rolling process is better than the common rolling effect;analysis of the influence of feed rate,radial feed and workpiece speed on surface roughness and surface microhardness.