Simulation And Experimental Study Of Aluminium Alloy 2219 Hot Spinning

The main trend of large carrier rocket vessel head manufacturing is the whole forming in aerospace industry.At present,the head of the vessel is mainly processed by cold spinning.The cold spinning forming of vessel head with small diameter thickness ratio has been achieved in China,however,due to the continuous work hardening and large spinning force during cold spinning,the forming accuracy is reduced.In order to solve this problem,the thermal spinning formability of aluminum alloy AA2219 thin-walled component had been studied in this paper,which provides technical support for the accurate spinning of the space head.The main objective of this paper are to study the high temperature mechanical properties of AA2219,and to build the thermal spinning simulation model,and to explore the hot spinning spinning formbility of thin-walled surface components using AA2219.The main contents of this paper are as below:1)Based on the thermal uniaxial tensile test,the rheological stress characteristics of AA2219-O and the material constitutive model were studied.Under the condition of deformation temperature in 473-673 K and strain rate in 0.001-0.1/s,AA2219-O material belongs to normal strain rate sensitive material,and the dynamic recovery mechanism plays a leading role near the deformation temperature in 573 K.Based on this,considering the coupling effect between strain rate,strain rate and temperature,a constitutive model of AA2219-O material under medium and high temperature was established based on Hollomon model,which improves the accuracy of AA2219-O flow stress calculation.2)Based on the ABAQUS/Explicit platform,the numerical simulation modeling of the thin-walled components hot spinning process was completed,and realized the characteristic analysis of the temperature field and the stress and strain field in the process of hot spinning.The AA2219-O thermal spinning tests showed that the wall thickness of numerical simulation under the same process conditions is in accordance with the test value,indicating that the simulation model is reliable.3)The thermal spinning experimental device based on induction heating was built,and completed the experimental research of AA2219-O hot spinning formability,and analyzed the deformation mechanism by numerical simulation method.The test results show that: for AA2219-O tube hot spinning,the incerasing spinning temperature will improve the limit drawing ratio and expand the window for forming.For AA2219-O hemispherical parts,single pass hot spinning will deteriorate the thickness thinning,but the degree of mold sticking was improved,rotary pressure dropped;multi pass will reduce wall thickness reduction.4)In view of the fact that the thickness uniformity of spherical thinwalled components is not improved,a radial differential temperature spinning technology was put forward,and the relationship between the distribution form of the temperature field and the wall thickness uniformity is analyzed by numerical simulation.The results show that Compared with the overall heating of sheet metal,the radial differential temperature spinning of hot material distributed at the back end of the spinning wheel will not enhance the uniformity of the wall thickness of the spinning parts,while the hot material distribution at the front end of the rotary wheel can significantly improve the wall thickness uniformity.The results show that the differential temperature spinning process can improve the uniformity of thickness.In the above research results,the high temperature mechanical properties of AA2219-O can also provide basic data for the hot forming process design of aerospace complex components,and the results of thermal spinning performance provide technical support for the improvement of head processing technology.