Deep Drawing Process Of 5182 Aluminum Alloy At Differential Ultra-low Temperature

In recent years,with the rapid development of the aerospace industry,the demand for aluminum alloy thin-walled parts is increasing.Due to the low plasticity and poor forming performance of aluminum alloys,it is difficult to form using traditional deep drawing processes.Through the ultra-low temperature differential temperature drawing process,the expansion and drawing limit of aluminum alloy can be effectively improved.In this paper,numerical simulation and experiment are combined to study the drawing and bulging process of 5182 aluminum alloy,analyze the influence of different technological parameters on its forming,and obtain the limit deformation under different technological parameters.Aiming at the need of low temperature environment in this experiment,the design of low temperature experiment box was carried out.In order to meet the experimental requirements,the device includes: ultra-low temperature cooling system,incubator,coolant recovery device,exhaust device,online collection system and hydraulic control system.Corresponding punches,concave dies,blank holders and other structures were designed.Through the structural design of the experimental mold,the forming needs of the cylindrical parts can be met.In order to meet the requirements of the experimental cooling and heating,the mold cooling temperature field simulation was carried out.A reasonable mold temperature distribution was obtained.The gap and related dimensions of the male and female dies were calculated,and a reasonable ultra-low temperature drawing test device was designed.The minimum forming temperature was-196?.Carried out numerical simulation study of 5182 aluminum alloy room temperature and low temperature bulging process,and compared with the experimental results in[43],analyzed the forming limit and forming load change at room temperature,-50?and-100?.The changes of the ultimate bulging height,the ultimate strain at the rupture position,and the thickness distribution of the bulging specimen were analyzed to verify the accuracy of the numerical simulation.A numerical simulation study on the drawing process of 5182 aluminum alloy cylindrical parts was carried out.The effects of different sheet diameters on the maximum drawing depth,wall thickness,and stress distribution of aluminum alloy under room temperature drawing were analyzed,and the limit at room temperature wasdetermined.Draw ratio.In order to further improve the forming performance,analyze the influence of the sheet diameter on the forming performance under the condition of differential temperature,and the distribution and change of the temperature field of the cylindrical member as the drawing process proceeds.In order to further analyze the influence of temperature gradient on forming performance,different temperature fields were used to analyze the corresponding stress distribution and wall thickness changes,and the best drawing process parameters were obtained.The deep drawing experiment of the cylindrical part was carried out,and the forming performance of the cylindrical part at room temperature and different temperature fields was compared.The drawing depth,stress distribution and wall thickness uniformity of the formed cylindrical part are analyzed,which is consistent with the simulation and proves the correctness of the simulation.