Aging Forming Research And Finite Element Simulation Of 7075 Aluminum Alloy High Flange Panel

In the field of aerospace manufacturing,the overall high reinforced wall because of their excellent lightweight structure to replace the traditional riveted way have good application prospects.And after milling and into the overall high reinforced wall using the traditional forming technology to forming effect is more difficult to control,creep age forming technology(CAF),as a new forming technology,in large overall high reinforced wall plate forming has obvious advantages.However,using the creep aging process in high reinforced wall forming,its shape will be aging process parameters with high reinforced wall structure parameters of mutual influence.So the high harden steel wall component under creep age forming process,summed up the high steel wall plate forming law under creep aging is very necessary,which in turn can high reinforced parts low-cost manufacturing to provide certain theoretical basis and practical guidance.Based on the 7075 aluminum alloy high reinforced wall typical structure as the research object,first of all,according to the characteristics of the high reinforced wall structure design guide pillar type tooling mold,using DK7650 wire cutting machine tool typical structure of 7075 aluminum alloy was prepared by high reinforced wall;By orthogonal experimental study on the aging time,aging temperature,height of rod and rod thickness on the quality of the workpiece forming,using the method of mathematical analysis it is concluded that the aging and structure parameters on the7075 high reinforced wall forming springback of limitation influence degree;And through experimental study on the main factors affecting the aging time,height of rod,rod thickness of workpiece forming springback rule,the test of artifacts in rod buckling phenomenon,research the rod is obtained high thickness ratio H/t(rod height/rod thickness)to the unstability of the workpiece.Second,to uniaxial tensile test of 7075 aluminum alloy sheet,according to the obtained experimental data,was deduced based on the aging strengthened material constitutive equation of the model,the constitutive equation of fitting curve and test curve analysis,found the error in the range of test allows,proved the accuracy of the constitutive model;After using the finite element software ABAQUS platform,the establishment of a high of 7075 aluminum alloy reinforced wall creep age forming finite element model,and compared with experimental data to verify the accuracy of the finite element model.Finally,using the established 7075 aluminum alloy high reinforced wall creep age forming finite element analysis model,the impact on the forming process of workpiece springback and other factors of instability of further study,by simulating aging time,load,pressure,preload die radius of sheet,plate thickness and width of the workpiece forming springback,the resilient rate is obtained with the change rule of the influence of various factors at the same time,in view of the rod in the experiment phenomenon of instability,with maximum lateral displacement of the unstability of the rod macro performance,to simulate the rod high thickness ratio H/t(rod height/rod thickness),artifacts,generous than B/t(reinforcement plate width/rod thickness),and the relative thickness of the workpiece t/l(the thickness of the rod/bending point spacing)influence to the unstability of the workpiece,the rod is obtained the influence law of the maximum lateral displacement of the ratio changes.