Numerical Simulation Study On The Forming Process Of Radial Axial Ring Rolling

The radial axial ring rolling technology has been widely used to produce rings with different materials,different diameters and different cross-section shapes due to its advantages of high forming quality、high material utilization、high production efficiency and low production cost.However the forming process of radial axial ring rolling is very complicated and changeable.In the actual production of the factory,the traditional method of trial and error is mostly adopted by the people’s experience,which makes the production cycle of the product long,the product single and high production cost.Therefore,the finite element numerical simulation is used in this paper to provide the basis for the design of the key process parameters and provide theoretical guidance for the actual production.Based on the Forge finite element software of French Transvalor company and based on rigid plastic finite element theory,according to the working principle of actual rolling,a finite element model of radial axial ring rolling was established.By comparing the simulation data with the actual production data,the reliability of the established model was proved,and the deformation law of radial axial ring rolling was elaborated.Then,a special radial axial ring rolling finite element model is established.In this mode,the upper axial conical roll is not feed only for the end surface shaping.Based on the rolling model and the initial ring size of the ring,three different mandrel feed mode as constant feed rate,constant per rotation feed and constant external radius growth rate were designed,through the comparative analysis we can come to conclusions: the feeding mode of constant feed rate is a simple and easy to achieve,but the external radius increased too fast during the later stage,not easy to control the stability of ring rolling process;when the mandrel roll respectively with constant per rotation feed、the constant external radius growth rate feed radius,initial velocity were 2.4mm/s,3.72mm/s,is relatively large,need larger rolling force,the equipment requirements are higher;when the mandrel roller with constant external radius growth rate,the temperature range is 88.738 degrees,largest of the three feeding mode,go against to the stability of the temperature control in the rolling process.Finally,according to the actual production need,a special-shaped radial-axialring rolling finite element model was established.The feed strategy based on the mandrel roll’s stepwise feed was introduced.First,the initial rolling stage wad2mm/s constant speed feed.The steady rolling stage adopted the feed mode of constant external radius increasing speed 2mm/s.Finally,the shaping stage took the feed mode with constant outer radius increasing speed 1mm/s.The rolling process in a production cycle was numerically simulated,and the deformation law in the process of radial ring rolling with special-shaped section was preliminarily explored,so that the rectangle cross-section rolling finite element model is extended to the special cross-section ring,broaden the scope of application of finite element simulation,enrich product diversity.