Research Of Ultrasonic-assisted Spinning Plastic Deformation Mechanism And Design Of Resonance System

According to domestic and foreign research, introducing ultrasonic vibration during plastic forming technology can not only improve flow performance metal materials, break through the limit of conventional plastic forming process, but also can improve the organizational performance of metal. We have introduced ultrasonic vibration in thickness reduction spinning process in the experiments, conducted ultrasonic thickness reduction spinning test, but the mechanism of ultrasonic spinning lacking understanding at present., We have introduced ultrasonic vibration in thickness reduction spinning process in the experiments, conducted ultrasonic thickness reduction spinning test, but the mechanism of ultrasonic spinning lacking understanding at present. the design of the ultrosonic spinning system is limited. This article focuses on ultrasonic plastic forming mechanism and the design of ultrasonic thickness reduction spinning tool and harmonic components; it’s of great significance to the theory and application of ultrasonic spinning.This paper analyzed ultrasonic plastic forming mechanism by using the method of experiment and simulation analysis, by ultrasonic single point of extrusion experiments and metallographic analysis of the extrusion indentation section, combining the theory of metal plastic deformation are analyzed, and through inversion have been carried out to verify the simulation. Through the simulation and experiment, found the lower amplitude transformer impedance, to improve the performance of spinning resonance system are studied. Get the following conclusion:1. There is a coordination mechanisms between ultrasonic energy and pressure energy during plastic deformation:under the same load, the superposition of ultrasonic can improve the metal plastic deformation rate, and the amplitude, the greater the deformation increases, the greater the load is small, the ultrasonic vibration can be good passed to material inside, when ultrasonic vibration is mainly characterized by impact, and when the load is larger, the ultrasonic vibration can be passed to the internal material, make the material in the plastic processing showed a "softening" phenomenon;2. Through a single point of ultrasonic extrusion experiments found that a series of phenomenon, mathematical analysis, concluded that the micro mechanisms of ultrasound to soften the material interface pulse can stimulate the crystal vibration, internal energy is converted into deformation crystal, polycrystalline material reduce hardening of the trend. Ultrasonic softening mechanism according to modify material hardening exponent of the constitutive relation of material deformation simulation, can the better experimental results. Through inversion validation, proved that the mechanism of inference conclusions and modified index selection is correct;3. According to the finite element method to design the structure of a variety of ultrasonic spinning amplitude transformer, through experimental analysis, found that the smaller the wheel diameter, thickness, impedance, also for wheel center dig a hole and change the wheel structure, the impedance has significantly increased, amplitude transformer structure on its impedance influence is very big, in this paper, based on the experimental results based on simulation, designed the amplitude of ultrasonic vibration of the good performance of spinning apparatus. Verified by ultrasonic spinning experiment, the design of design of the resonant system is reliable.