In other conditions remain unchanged, with the different die cone angle, equivalent stress suffered tube, equivalent strain also will be changed. With the die cone angle increases, the equivalent stress increases, but the equivalent strain decreases. With the die cone angle increases, the punch load decreases.
In vertical large diameter thick-walled
seamless steel pipe extrusion numerical simulation, the punch load changes can be divided into three stages, filling stage extrusion, extrusion stability and end stage compression stage. When the blanks are not filled die cavity, with the extrusion load was gradually increased and reached a peak; when working with metal outflow stabilize a certain distance from the load, when extruded to a certain length later, with extruded decreasing the load continues, the end of the extrusion process.
