Drawing Of5A06Aluminum Alloy Cone Cup With Double Side Pressure

Sheet hydroforming technology, is a kind of advanced flexible plasticprocessing, which the liquid is used to replace die, therefore it has the property offlexible plus. Compared with ordinary deep drawing process, due to the retainingeffect of friction between the punch and sheet and the fluid lubrication effect inflange area, Sheet hydroforming technology greatly improves the forming limit ofsheet metal. Drawing with double side pressure is one of the sheet hydroformingtechnology which exerts liquid pressure on the upper sheet surface. The positivepressure on the upper surface can partially or completely offset the bottom chamberpressure, which allows applying greater pressure suppression thinning,and improvesthe forming limit, especially suitable for forming process of the parts with a largevacant area.In this paper, in order to meet the needs for deformation of thin sheet metalforming for weaponry,5A06aluminum alloy cone bottom cup was deformed usingdrawing with double side pressure by numerical simulation and experiments, thebest process parameters for the formability of the material were summarized.The forming process was simulated by software ABAQUS and DYNAFORM，the effect on the thickness distribution of parameters such as the bottom pressure,theupper pressure, hydrostatic pressure, friction coeffic ient, and the anisotropy wereinvestigated. Furthermore, the relationship between the three-dimensional stressstate and the wall thickness, and three-dimensional stress on the punch and blankholder vacant area were analyzed deeply. Rhodes coefficient was used to establishthe relationship between the stress state and the wall thickness changes. Therelationship between Lines of constant wall thickness and stress state was studiedproviding a theoretical basis for the drawing with double side pressure.Experiment recearch for5A06aluminum alloy cone bottom cup was performedcontaining analyzing the wall thickness distribution under different pressure.Thebottom pressure influence on the forming Springback was studied.The plasticinstabiligy behavior and the failure types were analyzed and the effective solutionswere made, and eventually cone bottom cup part with a relative uniform wallthickness was formed.