FEM Simulation And Analysis On The Process Of Structure Steel's Bending And Deforming

When the L_structure steel is bended on the symmetrical three roll bender, there is the serious wave deforming in the short arm of structure steel. As the object and context of research, 3D finite element analysis (FEA) software ABAQUS/Explicit is used to build the FEM model and analysis the rolling process. The stress's distributing of L_structure steel's the length and breadth in the different location is chiefly analyzed, especially the Mises stress in the brim of short arm. It explains the reason of wave deforming in different rolling parameters and makes me to get the base parameters that can make a good molding effect. In addition, the relation on curve radius and the descending distance of over roller in different rolling parameters is researched by the former parameters. Finally, curve radius of the theory's and the springback's is contrasted. The research is signification in conducting the production and practice and the realization of L_structure steel's FEM simulation affords the experience of the simulation for more machining of structure steels that have complex section. The main studying work and results are shown as flowing.(1)Simplify equipment. The roller and fastening tools are designed as the whole and the numbers of finite elements in structure steel are reduced. The steady model is build, thorough amending the model and observing the curve of energy history and the stability of running about over roller. The dynamic simulation of L_structure steel is realized.(2)The short arm that is most easy to deform in production endures press stress and other location often endure pull stress, thorough observing the curve of Mises stress and time in different locations of the same section and the curve of all ponderances of stress and time. The location has the biggest Mises stress and the equivalent plastic strain. This is the main reason that the short arm of L_structure steel is easy damnification.(3)Simulation find that there is the biggest Mises stress in the wave deforming site of L_structure steel ,and when rolling bending is end ,Mises stress is still bigger than yield stress of material. The main reason of short arm wave deforming is the biggest stress value of alternation. Simulation also find that it can distinct improve the molding effect by changing the descending distance of over roller, the distance between fasten tools and work faces, friction coefficient and running velocity of over roller etc. When the distance between under roller and under roller is 350mm,and it is necessary that the descending distance of over roller is less than 15mm, the distance between fasten tools and work faces is 2+t+2(t is the thickness of L_structure steel), the running velocity of over roller is slow, simulation can get better effect. When the distance between under roller and under roller is 400mm, these parameters should use less than 25mm, 2+t+2 and slow running velocity.(4) By changing the descending distance of over roller to simulate and counting the curve radius, find that curve radius and descending distance of over roller also is the relation of power function. The corresponding relation of foundation is not found, because these datum are dispersive and the section of structure steel is complex.(5)Friction coefficient between roller and structure steel has influence to the curve radius. With the augment of Friction coefficient, the molding curve radius is also bigger. In addition, theory radius that is counted by different method is compared with the real curve radius, and the relation between springback and the descending distance of over roller is simply studied.