Research On Rolling Deformation Law Of Ring With Outer Stepped Cross-section

Ring rolling is a specialized rolling process for manufacturing seamless rings, in which the diameter of the ring increases as the ring cross-section decreases by rolling. It has many characteristics such as saving forming force, production cost, increasing utilization ratio of energy and material, rising productivity and widening processing range of ring products etc. Nowadays, many production has been obtained about rectangle section ring's rolling theory and designing methods, and advanced the rectangle section ring's application and development. But the rolling theory and design methods of abnormity section ring are scarce, and it is not sufficient for need of development. According to applications actuality and development current of ring rolling, abnormity section ring rolling has developed an important development orientation rapidly, and at the same time it is a question that needs to be settled immediately. As train wheels, bike rims, bearing ring, piping flange tray and piping link piece etc, ring with outer stepped is applied widely. One of the questions when rolling ring with outer stepped cross-section is how to guarantee metal full of model when geometry dimension reach to stated dimension, and form perfect section shape.In this paper, based on the theories of elastic-plastic finite element method and the theories of ring rolling, the calculation model of stepped cross section ring rolling processes has been established and calculated by dynamic algorithm finite element program. The condition of bite, penetration, invalidation is investigated respectively. On the base of ABAQUS operating flat, and simulate plastic deformation characteristic in the process of ring with outer stepped cross-section on the base of explicit dynamics method that ABAQUS provide, and investigate the influence rule of technics parameters, simulate the process of ring rolling using different feeding velocity and different friction coefficient, and at the same time investigate the influence rule of geometry dimension to rolling result. The influence rule of technics parameters to rolling moment is investigated too. In the end, the influence law of guide roll position to metal axial-flow is analysed, the result show, metal axial-flow increase with the angle increasing, the results of this paper provide theory basis of ring with outer stepped cross-section.