| Compression bending of metal sections, as a newly-developed method of 3D bending process, has gradually come into practical application in automotive industry. Up to now, it is still more a kind of art than a technology because there are lots of influential factors and very complex boundary conditions in compression bending deformation area. To explore the compression bending deformation mechanism will have important theoretical and practical significance. This article studied compression bending of U-shape metal sections under different processing conditions by means of theoretical analysis ,experimentation and numerical simulation, which laid a preliminary theoretical and practical foundation to three-dimensional compressing bending parts in automobile industry. This article analyzed the forming characteristics of compression bending of metal sections. Based on the basic theory of bending, this paper brought forward a method to obtain desired bend radii by changing relative position of bending dies in certain directions. This article probed the radius distribution rule of three-dimensional compressing bending in corresponding to different processing conditions. Bending radius decreases when compressing area decreases; at inner side of bend, with the bending radius decreasing the thickness of cross section increases, which depresses the thinning trend around outside edge; the forming limit is constrained by wrinkling destabilization. For the purpose of further understanding of the deforming trend of within bending area and the influence of processing parameters to bending radius, the three-dimensional compressing bending process of a kind of U-shape sections is analyzed by means of numerical simulation with DYANFORM software. |
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