Aiming at the problems of aluminum alloy parabolic parts that are prone to tearing and wrinkling during forming,the viscous backpressure forming method is proposed to form such parts.Through the finite element analysis of the forming process of parabolic parts,the equivalent stress and deformation tendency of the specimen under different viscous backpressure were obtained,and the experimental method is used to validate the molding process.The research results indicate that the viscous backpressure forming not only im-proves the stress state of the sheet and reduces the maximum equivalent stress,but also changes the defor-mation path of the sheet and effectively improves the forming performance of the sheet.The qualified part with no defects was obtained under 9.2 MPa viscous backpressure.
Aluminum alloyParabolic partViscous backpressureFinite element analysis
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