| Because the aluminum alloy plate has the advantages of light weight, corrosion resistant performance, it has been widely used in the mechanical manufacturing industry.But the parameters of mechanical properties of aluminum alloy sheet is not comprehensive,and it is not only has poor plasticity but also anisotropic. So using the traditional stamping method usually cause the failure because of the crack. To getting a successful part, the stamping test may be tried again and again. This will cause not only the high cost and long cycle, but also the low economic benefit.In order to solve the above problem, this paper will take the anisotropic material of6022 aluminum alloy plate as the research object. Firstly,through the tensile test and bulging test to obtain its mechanical properties parameters, and evaluate its forming performance. And then do the simulation of the hydro-mechanical deep drawing with the6022 aluminum oil pan by using the finite element analysis software ABAQUS. And do the optimization of the process. In order to ensure the accuracy of the simulation process and predict whether plate cracks will appear or not in the process of forming accurately,Barlet89 anisotropic yield criterion was written as the ABAQUS user subroutine to describe the yield of aluminum alloy sheet. And a new local bifurcation theory was proposed as the criterion of instability in this paper.The mechanical properties parameters of 6022 aluminum alloy plate was obtained through the two test. And by using this, an evaluation on its forming ability was done. The finite element analysis software was used to simulate the above two experiments and the new criterion of instability was used to predict the crack. By comparing the simulation results with the test results, the validity of the instability criterion was verified. At last, the optimization in the hydro-mechanical deep drawing with the 6022 aluminum oil pan was done by using this criterion. And then the reasonable forming path was found. |
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