Structural Optimization Design And Finite Element Analysis Of Steel Wire Wound Flat Extrusion Cylinder

With the great attention and promotion of the development of lightweight and energy saving in the automobile,marine,rail and aircraft transportation industries,aluminum alloy extruded materials have become the most important basic materials in these industries.There are inevitable geometric and performance fluctuations in large metal wall panels used for plastic forming,which significantly increases the complexity of deformation in plastic forming of complex thin-walled parts,leads to the decline of forming quality and forming limit,and greatly restricts the accurate forming of large thinwalled parts.At the same time,there is still a certain gap between the design and manufacturing process of large-size flat extrusion cylinder and the world advanced level.In this paper,aiming at the problems of stress concentration and manufacturing and assembly difficulties at the arc transition of multi-layer flat extrusion cylinder structure,based on the idea of splitting before splitting,a new structure of flat extrusion cylinder is proposed: the integral flat extrusion cylinder is divided along the long axis,it can not only effectively reduce the stress concentration at the arc of flat extrusion cylinder,but also solve the problem of difficult processing of flat extrusion cylinder wall;The pre tightening of the inner cylinder by wire winding instead of the outer prestressed ring can significantly reduce the assembly difficulty of the extrusion cylinder.In this paper,a structure of steel wire wound prestressed split flat extrusion cylinder is studied and designed,and the integral and split prestressed steel wire wound flat extrusion cylinder are compared and analyzed by finite element method.At the same time,the effects of different preloading methods,steel wire winding diameter and layers on the stress and dimensional stability of split flat extrusion cylinder are also studied,in order to provide reference for the adjustment of process parameters of wall panel production It provides a reliable theoretical basis for the structural optimization design of flat extrusion cylinder.The main contents and conclusions of this paper are as follows:(1)Based on the theoretical analysis of the flat extrusion cylinder,the transformation from the structural model to the mechanical model of the flat extrusion cylinder is completed.At the same time,it is expounded that the winding cylinder has greater advantages in bearing capacity than the integral cylinder.(2)Through the simulation analysis of the combined extrusion cylinder with interference fit,it is found that the extrusion cylinder with interference fit has better performance than the extrusion cylinder without interference fit in terms of stress bearing under working state.The pre tightening effect of steel wire wound extrusion cylinder is verified by finite element software,and the structure optimization design and analysis of extrusion cylinder are carried out.(3)The finite element calculation of steel wire wound flat extrusion cylinder with different layers and diameters is carried out,and the influence law of steel wire wound layers and steel wire diameter on the stress is analyzed and studied.In a certain range,the steel wire with multiple layers and large diameter is conducive to improve the bearing capacity of the extrusion cylinder.Figure [36] Table [6] Reference [86]...