Numerical Simulation Research on the Process of Multi-path Hot Neck-spinning Formation for the Cylinder

A neck-spinning route with initial-spinning point situated close to cramping fixture for first pass and leaving cramping fixturen gradually along the axis of tube for subsequent pass is investigated by means of numerical simulation based on MSC.Marc soft.The result shows that the model established is in accord with metal plastic deformation law for necking-spinning process.Local buckling occurs at the mouth of pipe at temperature of 1200℃.The wall is thick at mouth of pipe and thins at the knuckle,and is thicker and thinner with a rise in spinning temperature.The maximum equivalent stress and strain are located in outer-surface closed to the pipe mouth,and they are all reduced with the rise in spinning temperature.