Characteristic Of Ultrasonic Vibration On Plastic Deformation Of TA1 Foil

Ultrasonic vibration metal plastic forming is a method that applying a certain frequency and amplitude ultrasonic vibration along a certain direction in the process of plastic deformation in order to improve forming property. Studies have shown that this approach can significantly reduce the flow stress of material and the friction between the workpiece and its dies, improve the materials forming limit and processing quality of the product. At present, the research of ultrasonic auxiliary plastic forming has become an important research direction in the field of scientific research, many scholars at home and abroad have carried out research in this field, but relevant research for the ultrasonic vibration plastic deformation processes of foil are rare currently.In this study, a test device was designed to study the forming performance of TA1 sheets(0.15mm) with ultrasonic vibration. The device’s power is 3KW, frequency of 20 KHz, maximum amplitude is 60 um. The influence law of plastic deformation process with ultrasonic vibration is obtained by related tests, and based on this, through the microstructure analysis to explore the influence mechanism with ultrasonic vibration in the process of plastic deformation. In this paper, the research content mainly includes the following aspects:(1)Use the device designed by ourselves to conduct the tset with different times ultrasonic vibration. Via the result analysis to attain the influence law.(2) Through the microstructure analysis to obtain the mechanism of action of ultrasonic vibration in the process of plastic deformation.(3) By the ultrasonic vibration aided double hole test, bending test and bulging test, research in the process of plastic deformation when applying ultrasonic vibration ultrasonic specific influence on deformation quality of components, to solve some problems in practical production.The results show that the application of different vibration times increases the elongation from 40.33% to 41.95%, 44.34%, 54.46% and 51.75% respectively in tensile tests. In addation, applying high-power ultrasonic vibration will make the flow stress decreased dramatically first, then increases sharply to the level that non-ultrasonic test achieve. With the increase of applying ultrasonic vibration frequency, flow stress reduction in smaller and smaller. By observing the dislocation morphology in the process of the tensile test, dislocations present a trend of parallel arrangement, and there is no severe dislocation tangles when ultrasonic vibration is applied. While dislocation tangles and stacked will be found without oscillation. In the bending test, the application of different vibration times increases bending angle from 55° to 50°, 46°, 38° respectively. In bulging experiment, the capacity of plastic deformation has a increase of 34.5%. In flanging experiment, flanging height will increase and the springback become smaller.