Study Of A Rotary Forming Process For Symmetric Rim Thickening Of Disc-like Parts Under Heating Condition

Automobile industry,as the pillar industry of national economy,is limited to the potential security,energy loss and environmental pollution problems caused by excessive weight,and vehicle weight reduction is urgent to be implemented to meet the development needs.And spinning technology as a kind of advanced special forming technology,has a lot of advantages,such as good product performance,high material utilization,wide application range,small dimensional deviation and so on,and will certainly play a more and more important role in the future development of manufacturing.In this paper,a spinning symmetrical thickening forming method was adopted to shape the circular blank to a disc-like part with thin plate and thick rim under heating condition.A finite element model was established by means of mathematical modeling to study the whole spinning symmetrical thickening forming process,including the materials deformation characteristics,the influence of process parameters,etc.Simulation results showed that in the process of hot spinning symmetrical thickening forming the radial spinning force increased gradually,and the axial and tangential force were relatively small,furthermore the axial force presented different change trends under different parameters.The billet temperature drop slightly during the forming process,and when the initial temperature was 900?,the temperature of deformation zone stayed above 850?.The research on process parameters indicated that friction coefficient?and groove incline angle?were favorable for forming when relatively small,but the feed ratio f was more suitable for the larger values.The blank showed better forming performance when heating temperature T₀ is higher,and the forming force was also significantly reduced.With the change of the ratio?of the length to thickness and the thickness ratio?,the forming process presented different deformation characteristics.When the ratio?was too large,it was prone to buckling instability,and when the ratio?was too large,the forming tended to bulge instability.Finally,based on the simulation results a forming map was concluded with the ratio?and?on each axis.