Influence Of Double Drive Ring Rolling Forming On Organization And Properties Of 5A02 Aluminum Alloy Ring

The Production of National Defense Equipment high-performance rings is related to the rapid development of national defense industry,Its performance is directly related to the reliability and durability of defense equipment.However,conventional ring rolling process will also be difficult to meet the growing stringent requirements on the performance and stability of defense equipment high-performance rings.Double drive ring rolling(DDRR)process is an advanced ring rolling process.It has the advantages of general ring rolling process.In addition,it can enhance the strain uniformity of the ring as well as improve the organization and performance of the ring.However,the DDRR is a complex forming process of multi-factor coupling action,and the structure and performance evolution of the ring is complicated as well.At the same time,the residual stress of the rolling ring has a great influence on its performance and stability.Therefore,this paper is focused on 5A02 aluminum alloy ring,to find out the influence laws of the DDRR on the macroscopic forming process and the microstructure distribution and mechanical properties of the ring.Based on the residual stress test and the finite element analysis method,the real residual stress test and correction method of rolling ring was explored.Applying ABAQUS software to construct elastic-plastic finite element model of DDRR,the theory of metal deformation and flow laws is studied.At the same time,the effects of DDRR(different mandrel rotation speeds)and conventional ring rolling on the strain,stress distribution and rolling force parameters during ring rolling process are analyzed.Additionally,the influence of the process parameters(the driven roller feed rate,the friction coefficient between the ring and the roll and the initial rolling temperature of the ring blank)on the DDRR process of the ring was studied.And the DDRR process parameters are optimized.The rolling experiments were carried out on a double drive ring rolling machine to verify the feasibility of the preferred scheme.The microstructure and mechanical properties of the ring were analyzed according to the results of the experiment.In this paper,the microstructure distribution laws in different regions were researched between DDRR and conventional ring rolling,as well as the micro-hardness,tensile strength,elongation and cross-section shrinkage and other mechanical properties were investigated.The residual stress of the external surface and internal ring are measured by XRD residual stress test and electrolytic corrosion removal material method.The nonlinear isotropic kinematic hardening material model of the ring is constructed by tensile-compression testing loaded cyclically to simulate the residual stress of the rolling ring.Compared with the experimental test and the finite element analysis results,revert the internal residual stress test values of the ring parts,and finally obtained a real residual stress test correction method.The results of this study provide important theoretical basis and method guidance for the production and residual stress control of national defense equipment high-performance rings.