Analytical Solution And Application Of Temperature Field During Induction Heating Of Steel Plate

The processing of complex curved panels is a major difficulty in the shipbuilding process.The traditional processing method is the water-fire bending method,which uses oxyacetylene flame.The flame heating is highly dependent on manual practical experience to control the heat source,and the reproducibility is low.Both processing efficiency and quality depend on experience,which leads to the difficulty of improving the defect rate of the curved outer surface of the ship.Therefore,more and more scholars began to study the bending technology based on high-frequency induction heating.Generally,the induction heating process is solved by a nonlinear three-dimensional finite element model,and the deformation of the steel plate is simulated and predicted.However,the large amount of calculation of the thermo-elastic-plastic method requires high performance of the computer,and the solution process tends not to converge.In order to reduce the calculation time and improve the efficiency of the simulation,this paper proposes a simplified model for calculating the deformation of the steel plate induction heating based on the inherent strain method.First,the temperature field of induction heating of steel plates is simulated according to the theory of moving heat sources,and the temperature field of thin plates,considering heat loss,and induction heating of medium and heavy plates is derived.The point heat source is improved according to the size of laboratory induction heating.The multi-point heat source replaces the point heat source,so that the temperature distribution determined by the analytical method is more in line with the simulation of induction heating.Using the mobile induction heating equipment,the experiment of heating the steel plate was carried out,and the temperature distribution measured in the experiment was consistent with the model results.Through numerical simulation and metallographic experiment,the size of the inherent strain zone calculated by the mathematical model of the temperature field of induction heating is verified.The deformation of the steel plate by induction heating was studied by the equivalent load method.Design a single heating wire for induction heating of steel plates,and measure the lateral shrinkage of the two ends of the heating wire compared with the simulation results.Based on this,the equivalent load method is improved,and the lateral inherent distribution along the heating line is studied.The integrated lateral contraction is loaded along the lateral inherent strain distribution,which greatly improves the accuracy of the simulation and reduces the Deviation from experimental value.Prediction of multi-heating wire deformation of steel plate induction heating.The transverse and longitudinal deflections of the steel plate were measured by the wire drawing method and compared with the simulation results.It was proved that the improved inherent strain equivalent load method can be used for the research of multi-heating wire deformation of steel plate induction heating.