Optimization And Experimental Study Of Rolling And Forming Conditions Of Large Rings Based On Finite Element Simulation

Large aluminum alloy rings with good comprehensive performance are urgently needed in important fields such as aerospace,energy and power.However,the diameter and axial rolling process of large rings is extremely complicated and is affected by a variety of factors.Steady-state,asymmetric and non-linear problems,it is difficult to evaluate the rolling process completely by experiments.In this paper,on the finite element software platform,a 2219 aluminum alloy large-diameter rolling and axial rolling finite element model is established and changed.The feed conditions,roll size,rolling temperature and other rolling conditions are used to optimize the ring diameter and axial rolling process parameters;according to the optimized process parameters,field trial production is performed to analyze and compare the structure of the 2219 aluminum alloy ring before and after rolling And performance.The main research contents are as follows:(1)The finite element simulates the diameter and axial rolling process of 2219 aluminum alloy large ring under different rolling conditions.The simulation results show that the effect of rolling forming becomes better as the size of the roll increases.The braking force also increases as the size of the rolls becomes larger;as the rolling temperature increases,the ring forming effect becomes better and then worsens;and the ring feeds the feed at a rate that increases the diameter When rolling,the rolling effect is the best.Through the discussion of the influencing factors in the rolling process,the optimal rolling parameters of the ring are determined: the core roll size is?600,the main roll size is ?1350,and the rolling temperature is 440 ?,the feed mode is to control the feed rate at a diameter increase rate.(2)The optimized rolling parameters were used for on-site trial production,and the changes in properties and microstructure of 2219 aluminum alloy ring before and after rolling were analyzed.The metallographic,XRD,and SEM characterization of2219 aluminum alloy large rings before and after rolling were analyzed.As well as mechanical properties tests such as tensile properties and micro-hardness,we found that after rolling of the 2219 aluminum alloy large ring,the grain structure was significantly refined and a large number of Cu Al 2 secondary phases were formed.Obviously improved after rolling.It shows that the finite element simulation results can be used to guide actual production and have higher application value.