Research On Cryogenic Deep Drawing Law Of 5A06 Aluminum Alloy Square Box

In recent years,people pay more and more attention to the requirements of lightweight.Aluminum alloy,as an excellent lightweight material,is widely used in automobile,aerospace and other fields.It has higher requirements for the processing quality of aluminum alloy.It is no longer limited to simple shape,but needs more and more complex aluminum alloy forming parts.The plasticity of aluminum alloy is poor and its formability is common,but aluminum alloy has no cryogenic brittleness,and its strength and plastic deformation ability are improved at low temperature,that is,it has double increasing effect.We can try to carry out deep drawing at ultra-low temperature,that is,liquid nitrogen temperature(-196 ℃),so as to improve the forming limit of sheet and form complex curved parts.In this paper,5A06 aluminum alloy box is taken as the research object.The wall thickness of the sheet is 1 mm,and the opening side length of the box is 100 mm.By changing the corner radius of the edge and the shape and size of the blank,the ultra-low temperature deep drawing of 5A06 aluminum alloy box is studied by means of numerical simulation and actual experiment,and the influence of different process parameters on its deep drawing performance is explored,mainly including temperature,the corner radius of the box edge and the shape and size of the blank.The dynamic display module of Abaqus 6.14 numerical simulation software was used to simulate the cryogenic deep drawing of 5A06 aluminum alloy sheet under different process parameters.By analyzing the wall thickness distribution,stress-strain law and defect form,the influence of temperature,the corner radius of box edge and blank shape and size on the deep drawing quality was obtained,The reasonable initial blank shape and size corresponding to different corner radius are determined.The results of cryogenic deep drawing experiments of aluminum alloy box parts with different corner radius are basically consistent with the numerical simulation results,which verifies the existence of general regularity.Compared with room temperature deep drawing,the conclusion that cryogenic deep drawing can improve the forming limit of box parts is verified on the premise that other process parameters are fixed.The wall thickness distribution,stress-strain distribution and the causes of defects of the box are analyzed.The forming limit of the box is improved by adjusting the shape of the blank,including the corner cut length and the size of the blank.In addition,by optimizing the shape and size of the blank and changing the corner cut length of the blank,the maximum initial blank size,the limit drawing height and the limit drawing ratio under different corner radii are obtained.