| The overall airtightness and material properties of the rocket tank depend to a large extent on the forming accuracy of the tank head,which also plays a key and decisive role in the stability and safety of the liquid rocket.Aiming at the problem of melon-petal drawing and tailor-welding used in the traditional rocket tank head manufacturing process,this paper studies the formability of the aluminum alloy 2219M-O state ellipsoid surface sample in the two-step method after molding and then spinning.The main goal of this paper is to study the spinning simulation model of aluminum alloy 2219M-O state,and verify the thinning layer area of ??the experimental target sample.Therefore,it is necessary to explore the "two-step method" of spinning and flanging of aluminum alloy 2219M-O state surface samples.Process head formability.The main contents of this paper include the following four points:(1)Based on the mechanical tensile test at room temperature and the engineering mechanical property test report,the mechanical characteristics and material constitutive model of the aluminum alloy 2219M-O state were studied.Based on the Arrhenius model,the material constitutive model of aluminum alloy 2219M-O state at room temperature was established,which improved the calculation accuracy of the stress and strain of aluminum alloy 2219M-O state.(2)Based on the finite element simulation platform ABAQUS/Explicit,a scaled model of the plate blank sample is established.The experimental verification results of spinning and flanging in the 2219M-O state show that: under the same working conditions,the error of the reduced layer area of ??the scaled model does not exceed 10%,and the error of the wall thickness does not exceed 5%,indicating that the established simulation model is more credible.(3)For the problem that the spinning force of spinning flanging is too large,the gap error of the template is not controlled within the range of accuracy requirements.It is proposed that heating the thinned layer area in the step of spinning and flanging,the plasticity of the aluminum alloy 2219 at the deformation temperature of 493.15 K is better,which is beneficial to the multi-pass and micro-deformation trimming of the template gap.(4)Determination of process parameters for spinning flanging.A single variable method is proposed to determine the optimal parameter scheme,and the simulation data set is input into the ISIGHT software to calculate and compare the forming accuracy results of three optimal parameter schemes,and the optimal parameter scheme is subjected to the final experiment;Accuracy acceptance requirements. |
