Study On Ultrasonic Vibration Boring Technology Of Difficult-to-machine Materials(TC4)

As special materials become more widely used,the unfavorable phenomenon in boring process has been widely concerned by people.Ultrasonic vibration cutting technology is a new type of machining method which has been gradually developed by researchers since 1950 s.it can greatly improve the machining speed and quality.This task revolves around Ultrasonic vibration boring technolog of TC4,provides an economical and applicable method for hole machining of difficult machining materials,and finally achieving the purpose of improving the productivity and the processing quality.This task starting from the cutting principle of ultrasonic vibration boring,firstly,the trajectory equation of ordinary boring,longitudinal ultrasonic vibration boring and longitudinal-torsional hybrid ultrasonic vibration boring are established,and the route simulation is carried out by MATLAB.Then the task analyzes the cutting process and motion characteristics of ultrasonic vibration boring,and the differences between two kinds of ultrasonic vibration boring process,it point out the separation character,no fixed cutting angle character and air cutting character.Then the effect on cutting force by ultrasonic vibration boring process are studied.Based on the above research,the acoustic vibration system of ultrasonic vibration boring device is designed and simulated.First,according to the basic theory of the horn,the longitudinal ultrasonic vibration transfer systems is designed,then,a special structure of a tubular vibration transmission rod is added at the end of the system to achieve longitudinal-torsional hybrid ultrasonic vibration,and set a preliminary design about its structural parameters.Then the task use ANSYS to perform modal simulation on the horn to study the influence of the length of the transmission rod,the thickness of the flange and the parameters of the chute on the resonant frequency of the vibration transfer system,and get its optimal size under ideal conditions.Finally,the modal analysis,transient and dynamic analysis and harmonic response analysis of the vibration transfer systems under the optimal size are performed,and the subsequent processing module is used to describe the numerical simulation results,it can provide a theoretical basis for structural design and performance optimization of acoustic vibration system of ultrasonic vibration boring device.Based on the finite element analysis,the vibration transfer system was experimentally studied.By repeatedly testing the vibration transmission rods with different parameters,the final size of the structure that can be used for actual processing is determined,and the obtained results are basically consistent with the results of the finite element analysis.Then the impedance and amplitude of the assembled acoustic and vibration system were tested to prove that the design system can be used for test processing,and then the design of the boring tool and sleeve was carried out.Titanium alloy TC4 was experimentally studied by using an ultrasonic boring device,and a comparative test was conducted for ordinary boring,longitudinal ultrasonic vibration boring and longitudinal-torsional hybrid ultrasonic vibration boring processing.Through the test results,under the same conditions,ultrasonic vibration boring can effectively reduce the cutting force and the surface roughness of machined parts.