Expand-joint forming process of the large scale fin tube heat exchanger including support-plates was studied.Based on the software platform of LS-DYNA,finite element model of heat exchanger expand-joint forming process was established.Through numerical simulations,the deformation of fin and the influence of the existence of support plate on the fin were researched.According to the result,the expanding processing parameters are optimized.Finally,the changes of tube diameter before and after expanding were an...