Tension Rotation Bending Processing Research On The AZ31 Magnesium Alloy Profiles

In aviation, aerospace, transportation, military equipment and other fields, profiles as an important structural material have been more and more widely used, while the material made lightweight, recyclable, anti-electromagnetic interference and other requirements. AZ31 magnesium alloy has many unique advantages, but its poor room-temperature plasticity limits the application of AZ31 magnesium alloy and makes its potential not fully applied. Plastic forming technology of magnesium alloys is currently still in the experimental research and development stage, while the magnesium alloy tension rotation bending processing of wrought magnesium alloys is an important direction. In this paper, by using self-made hydraulic profiles tension rotation bending machine, combined with tension rotation bending finite element simulation of AZ31 magnesium alloy profiles, experimental research of tension rotation bending forming processing on the AZ31 magnesium alloy profiles is studied.This paper puts forward a processing method of profiles rotation bending, which could compensate springback for the use of tension rotation bending processing. And the hydraulic tension rotation bending equipment and online information collection systems were designed. AZ31 magnesium alloy finite element mathematical model of profiles tension rotation bending was created. Through finite element simulation of profiles tension rotation bending, the reasonable processing parameters of the magnesium alloy profiles tension rotation bending were determined, the effect of processing parameters on the profiles quality of tension rotation bending forming were analysised.AZ31 magnesium alloy profiles tension rotation bending processing experiment was completed.Through the tension rotation bending experimental research, the deformation zone of profiles cross-sectional size changes and metal flow laws were analysised, and the bending angle, temperature, pre-stretching value and the relationship between the springback angle were analysised. Experimental results showed that the temperature changing impact finitely on the springback angle, springback angle was decreased with the temperature increasing, bending angle and pre-stretching value were significant impact on the springback angle.Through the uniform design of experiments and using stepwise regression method, it has been able to obtained the springback angle of the regression equation which related to bending angle, temperature, and pre-stretch value. Experiments showed the feasibility of the regression equation and proposed amendments for the equation of research methods.