Design Of Ultrasonic Impact Test Bench

Ultrasonic impact technology can effectively eliminate the harmful residual tensile stress on the part surface or weld area and introduce beneficial compressive stress.It has strong advantages in improving the surface stress state and microstructure of materials.In the previous research on ultrasonic impact technology,hand-held impact gun is usually used for ultrasonic impact,which is difficult to ensure the stable preload and moving rate in the process of ultrasonic impact,and can not effectively show the characteristics of ultrasonic impact strengthening.Therefore,the purpose of this paper is to design a precision ultrasonic impact test-bed and carry out ultrasonic impact experiments on pure copper under constant preload and moving rate.The main research contents are as follows:(1)According to the application background of the test-bed,the functional requirements and technical parameters of the test-bed are set,and the overall scheme and control system of the precision displacement test-bed are designed.Firstly,the three-dimensional model of the prototype is established according to the overall scheme of the test-bed,and the transmission mechanism of each shaft is briefly discussed;Then,according to the design parameters of the test-bed,the key parts are theoretically analyzed,the dimensions of important parts are analyzed,;Finally,the important parts are optimized by using SolidWorks finite element simulation software.(2)Assemble the prototype of the test-bed,design the control interface of the ultrasonic impact test-bed,compile the PLC program,and carry out the final ultrasonic impact test.The surface morphology of pure copper under ultrasonic impact was observed by optical microscope.The hardness test results show that the hardness of pure copper increases gradually near the impact surface.Metallographic and EBSD tests show that the grain refinement is more and more obvious near the impact,which reveals the microstructure strengthening mechanism of pure copper under ultrasonic impact.Figure[58]Table[12]Ref[71]...