Influence Of High Frequency Vibration On Deep Drawing Process Of AZ31Sheet At Room Temperature

In metal deformation processing, if the workpiece is superimposed a certaindirection, frequency and amplitude of vibration and deformed under the vibration, therewill be some special phenomenon. It has been known that if vibration is superimposedon the mould or workpiece during the plastic forming process, not only would thefriction between the mould and workpiece, together with the total forming load，decrease， but also that the deformability and formation uniformity would increase; thiswould meanwhile result in an improvement of product quality. Therefore, vibratedplastic processing will become a new and probable method to improve the properties ofplastic forming of light alloy, for example, Mg alloy.Superposed quasi-ultrasonic vibration with a maximum output of2kW wasimposed on the deep drawing process of AZ31magnesium alloy sheet at roomtemperature, in order to reveal the effect of high frequency vibration on the formability,the forming load and the failure mode of AZ31sheet during the deep drawing process.Furthermore，combined with the existing theory of vibrated plastic processing andnumerical simulation method were used to analysis the mechanism of AZ31withultrasonic vibration. And this paper will mainly study the following aspects.①Study situation of metal vibration plastic processing theory and application athome and abroad was represented.②Ultrasonic vibration was superimposed on the deep drawing of AZ31Mg alloy.Then load-displacement curves, the failure mode, LDR and microstructure underdifferent conditions were compared. Qualitative analysis the effect of ultrasonicvibration on the deformation performance and microstructure of Mg alloy. In thesecases，the friction is a very important factor in compression process. And, we mustinvestigate the mechanism of vibrated plastic deformation of AZ31combining the“surface effect” and “volume effect”.③According to the amplitude, frequency and the maximum vibration energy ofVibration on Deep Drawing Process，we received the punch trajectory under differentconditions. Vibration deep drawing process of AZ31Mg alloy has been simulated basedon the vibration tensile testing data of AZ31Mg alloy and the different punchtrajectories, and simulation results were compared with the experimental results toverify the feasibility of the simulation method. From the point of view of the simulation, we got a preliminary investigation of vibrated deep drawing mechanism of AZ31.④From the experimental results and combined with the existing theory of vibratedplastic processing,we got a preliminary investigation of vibrated plastic deformationmechanism of metal.Through research of this topic, we have some knowledge of the law on the vibratedplastic deformation of AZ31, of which we preliminarily analysis the vibrated plasticdeformation mechanism of AZ31on the basic. It provides a little experimental andtheoretical data for the vibrated plastic processing area.