Numerical Simulation Of Spinning Process For Large Ring Parts

As-forged 18Cr2Ni4 WA steel,as the most important material for wind power gear rings at present,inevitably encounters defects such as porosity,coarse grains,and voids that seriously affect the properties of forgings during actual forging production.In this paper,the spinning process of 18Cr2Ni4 WA steel large ring is studied by combining thermal compression tests and simulation techniques,the thermal deformation behavior and spinning process of18Cr2Ni4 WA steel large ring during high-temperature deformation were analyzed as follows:(1)The high-temperature rheological behavior of as-forged 18Cr2Ni4 WA steel was studied through single pass hot pressing test.Based on experimental data,a constitutive model based on peak strain and a constitutive model considering strain compensation are established.(2)By means of numerical simulation,the basic deformation laws of flat anvil spinning were studied,and the effects of different process parameters on large annular parts during single step down pressing were studied.The effects of reduction ratio,anvil width ratio,and friction factor on the equivalent strain distribution,hydrostatic stress,and inner hole distortion of forgings were studied through data analysis.(3)By means of numerical simulation,the influence of the feed ratio of the upper anvil on the flat anvil spinning process was studied.Through data analysis,the size of the feed ratio of the upper anvil and the influence of the wrong anvil method on the deformation uniformity of the surface and interior of the forging were studied.(4)Based on orthogonal experiments,the effects of reduction rate,anvil width ratio,friction factor,and upper anvil feed ratio on the equivalent strain and hydrostatic stress of forgings were revealed.The results were analyzed for range and variance,and the optimal combination of process parameters was obtained.(5)The influence of anvil width and upper anvil feed ratio on spinning efficiency was analyzed through numerical simulation.Finally,the impact of reduction times on spinning efficiency was analyzed,and effective methods to improve spinning efficiency were obtained.