Study On High-frequency Induction Bending Of The Sheet Metal Multifield Coupling FEM And Simulation Based On APDL Language

The plate bending technology is one of the most important stages in ship building.For laying a solid basis of theory and application on the digitized sheet bending formingof key technology and engineering application, the forming mechanism and engineeringapplication of sheet metal under the multi-physics coupling effect ofelectromagnetic-heat-stress–deformation was studied systematacially with in-depththeoretical and simulation. Through establishing simulation model based on the APDLlanguage, the affection process of parameters (heating time, current density andfrequency) on plate bending was studied. In the paper, the forming law of plate bendingin the different thickness with gravity in high frequency induction heating was studued,and the effect for bending under different external load and forming was studied.Meanwhile, the law of plate multi-pass bending was discussed. Finally, the verificationexperimental with gravity was done.The results show that, the temperature gradient decreases, the highest heatingtemperature first decreases then increases and last decreases, the bending angles firstlyincreases then decreases, the maximum residual stress decreases with the heating timeincreases. The temperature gradient increases, the highest temperature and the bendingangles increases until reached to an equilibrium value, the maximum residual stressdecreases with the current density increases. The temperature gradient increases, thehighest temperature, the bending angles and the maximum residual stress increases untilreached to an equilibrium value with the current density increases. The temperaturegradient increases firstly and then decreases, the highest temperature decreases andincreases firstly, and then decreases and increases, the bending angles decreases andincreases firstly, and then decreases, the maximum residual stress decreases firstly andthen decreases with the plate thickness increases. The heating temperature of freebending, gravity bending and counterweight bending were same to each other. Thebending angles of free bending are the smallest and the larger one is the angle withgravity, witch increases with the counterweight increase. The maximum residual stressis the largest under free bending and the gravity bending followed. However, it remainsunchanged with the counterweight increases. The temperature gradient increases, the fluctuations the highest heatingtemperature is more obvious, the bending angles increases, the maximum residual stressdecrease with the heating number increase in multi-pass heating.The error is less than±12%contrasting the bending angle of experiment andfinite element simulation which shows that the FEM is reasonable.