Research On Hydromechanical Deep Drawing Of2219Aluminium Cylindrical Cup

Using high strength and light weight material is the main means to realize the goalof bigger load and higher reliability with the development of space vehicle. Rocketpropellant tank is one of the main body structure of carrier rocket, and2219aluminumalloy was mainly used in it. Because of the enhanced feature of2219aluminum alloy, itwas usually used by drawing method after solid solution hardening, which has a worsematerial elongation, so it was difficult to forming by the traditional forming method.Hydromechanical deep drawing have advantages of high forming limit, high accuracyand reduction of the mold cost, so using hydromechanical deep drawing to form2219aluminum alloy has a good application prospect.This paper has studied the formability of2219aluminum alloy with different heattreatment conditions, and found that plasticity has decreased, and intensity has increasedwith O state, solid solution hardening state after artificial aging. And the formability ofthe sheet was best with30minutes solid solution treatment. The material plasticitycould be maintain good with150min after the solid solution, and plastic drasticallyreduced with more than180min. Have got the FLC(forming limit curve) by the solidsolution hardening state of2219aluminum alloy sheet.2219aluminum alloy forming ability in hydromechanical deep drawing processwas studied using numerical simulation software. The thickness distribution was studiedthrough different liquid pressure. The best liquid stress of flat cylindrical piece is10MPa, the best liquid stress of spherical cylindrical piece is5MPa, and the best chamberpressure loading rate was obtained.Experimental researches on the flat and cylindrical spherical Hydromechanicaldeep drawing process were studied, and the effect of the fluid pressure, the pressureloading rate were studied. Respectively, the test for the cylinder and ball with flatbottom cylinder wall thickness distribution and the typical position of strain field, andgot a flat cylindrical parts, spherical cylindrical parts typical of strain path; Found thatthe hardness value with the strain of the sheet metal has a larger proportionalrelationship.Experiment to test the anisotropy of2219aluminum alloy plates, and studied theanisotropy effect on deep drawing. The values of r in the direction of0°,45°and90°were0.47,0.87,0.42. The thickness distribution in different direction wasobtained:45°direction uniform wall thickness distribution is the best. The stressdistribution was obtained by numerical simulation. The largest difference in stress is indie corner place, the meridional stress value was in turn decrease according to the90°,0°,45°direction. And orming specimen through numerical simulation andmeasured strain in different direction of the maximum principal strain and minimum principal strain: the largest strain is in45°direction, and it is most likely to occurplastic deformation.